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ACC: Automotive Climate Controller

1. The system shall correlate temperature to resistance with a resolution of 1 F The system shall persistently monitor temperature sensor status while the vehicle is running 6 8 2 Source Team Auto Climatix 6 8 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A hardware malfunction at the microcontroller may yield faulty status conditions for temperature Oxidation of the temperature sensor control wires may result in increased resistance values 6 8 4 Standards None 6 8 5 Priority Critical 6 9 The system shall control the vehicle s mono valve 6 9 1 Description The system shall deliver a PWM signal to the mono valve The system shall persistently monitor mono valve status while the vehicle is running 6 9 2 Source Team Auto Climatix 6 9 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A hardware malfunction at the microcontroller may yield faulty status conditions for the mono valve Mono valve diaphragm failure may result in unexpected mono valve behavior 6 9 4 Standards None 6 9 5 Priority Critical 6 10 The system shall control the vacuum source of the system 6 10 1 Description The system shall control the vacuum source The system shall trigger power delivery from the battery to the vacuum source The system shall mo
2. 5 3 1 Description The Automotive Climate Controller application shall be installable updateable and a newest version that can run on platforms of common mobile operating systems Users can request for a new version or download a free new version via Internet 5 3 2 Source Team Auto Climatix 02 12 2012 18 Auto Climatix System Requirements Specification Automotive Climate Controller 5 3 3 Constraints A software CD must be enclosed in the Automotive Climate Controller package 5 3 4 Standards None 5 3 5 Priority High 5 4 The Automotive Climate Controller shall be a single package 5 4 1 Description The microcontroller and mobile device shall be delivered in a single package The package shall include a user manual showing product installation on an early model 1980 s Mercedes 5 4 2 Source Team Auto Climatix 5 4 3 Constraints The manual shall only provide instruction for connection for the specified vehicle The manual may not be indicative of all vehicle configurations 5 4 4 Standards None 5 4 5 Priority High 5 5 The Automotive Climate Controller shall be installable and configurable by an end user with fair mechanical knowledge 5 5 1 Description The system should be installed by following the steps as described in the user s manual of the system The process will first involve ripping open the chassis of the vehicle that the system is to be installed on Then the original air conditioning system i
3. 7 4 2 Source Team Auto Climatix 7 4 3 Constraints The mobile platform we use might not have appropriate garbage collection functionality 7 4 4 Standards None 7 4 5 Priority Moderate 7 5 The system shall be physically rugged 7 5 1 Description The system shall be able to withstand the oscillation rate of 10 Hertz 7 5 2 Source Team Auto Climatix 7 5 3 Constraints Verification depends on the resources available to the team 7 5 4 Standards None 7 5 5 Priority Moderate 7 6 The failure rate of the mobile application shall be less than a 1 10 000 uses 7 6 1 Description The system shall not fail more than once for 10 000 uses 7 6 2 Source Dr Gergely Zaruba 7 6 3 Constraints Vehicle hardware failure may be significantly less reliable than the Automotive Climate Controller The mobile device may be delivered in a faulty condition from the factory Hardware components may be delivered to team Auto Climatix in a faulty condition 02 12 2012 28 Auto Climatix System Requirements Specification Automotive Climate Controller 7 6 4 Standards None 7 6 5 Priority Future 02 12 2012 29 Auto Climatix System Requirements Specification Automotive Climate Controller 8 Safety Requirements These safety requirements are meant to address user and technician safety during regular operation or installation These requirements largely address damage prevention for both the vehicle and the microcontroller 8 1
4. The system shall accept readings from vehicle pressure sensors The system shall monitor vehicle pressure sensors persistently while the vehicle is on 6 12 2 Source Team Auto Climatix 6 12 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A hardware malfunction at the microcontroller may yield faulty status conditions for pressure sensors This system must be implemented only with the compressor clutch 6 12 4 Standards None 6 12 5 Priority Future 6 13 The system shall monitor the vehicle s power status 6 13 1 Description The system shall accept input differentiating between vehicle off vehicle battery power engine active and engine idle 6 13 2 Source Team Auto Climatix 02 12 2012 25 Auto Climatix System Requirements Specification Automotive Climate Controller 6 13 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A hardware malfunction at the microcontroller may yield faulty status conditions for pressure sensors 6 13 4 Standards None 6 13 5 Priority Moderate 6 14 The system shall control the vehicle s water pump 6 14 1 Description The system shall trigger power supply from the vehicle battery to the vehicle water pump The system shall initiate this action upon engine idling 6 14 2 Source Team Auto Climat
5. 126 Using the table 8 7 from McConnell Software Type Systems Software Skill level Type Worst in class 126 8 8 9 calendar months COCOMO MODEL This model continues from the function point analysis Here we take the function points calculated and convert them to the lines of code using the multipliers for that particular language Most of the code of our application will be written in object oriented language Java Objective that will be for the mobile application in the mobile device Some part of the coding will be in the PIC micro controller which will be PIC Assembly Macro Assembly and C Since this model is using the function Points from the Function Points Analysis again this model gives us the complexity of the system and the estimated time that will be consumed in terms of the input outputs inquiries logical files and interface files FPs from function Point Analysis 146 Unmodified Lines of Code C 126 128 16128 Objective C Java 126 53 6678 PIC Assembly Macro Assembly 126 213 26838 Modified Lines of Code C 126 128 16128 30 4838 4 gt 4839 Objective C Java 126 53 6678 65 4340 7 gt 4341 PIC Assembly Macro Assembly 126 213 26838 5 1341 9 gt 1342 Summation 02 12 2012 51 Auto Climatix System Requirements Specification Automotive Climate Controller C Objective C Java PIC Assembly 4839 4341 1342 10522 Lines of Code Effort Applied a KLOC bi 3
6. Electrical hardware shall implement fly back circuits 8 1 1 Description The fly back current shall be controlled in the system for connections requiring high amperage or voltage 8 1 2 Source Dr Gergely Zaruba 8 1 3 Constraints None 8 1 4 Standards None 8 1 5 Priority Critical 8 2 The microcontroller shall implement fuses 8 2 1 Description The micro controller board shall implement appropriate fuses 8 2 2 Source Dr Gergely Zaruba 8 2 3 Constraints None 8 2 4 Standards None 8 2 5 Priority High 8 3 Electrical wiring shall be insulated 8 3 1 Description The wirings of the system shall be insulated properly so as to prevent interference with and from other electronic devices within the vehicle 8 3 2 Source Team Auto Climatix 8 3 3 Constraints None 8 3 4 Standards None 8 3 5 Priority Critical 02 12 2012 30 Auto Climatix System Requirements Specification Automotive Climate Controller 8 4 The system shall warn users of extremely high temperature input 8 4 1 Description The system shall stay passive and display a warning to the user of extremely high temperature input 8 4 2 Source Team Auto Climatix 8 4 3 Constraints None 8 4 4 Standards None 8 4 5 Priority High 8 5 The system shall warn users of extremely low temperature input 8 5 1 Description The system shall stay passive and display a warning to the user of extremely low temperature input 8 5 2 Source Te
7. discussed below 13 1 Scope Analysis The nature of the project is very feasible for the team Auto Climatix to accomplish However the project size as determined by different estimation techniques is very huge So it is almost impossible for the team to complete the project on allocated time The team is very excited to complete the project by implementing all the requirements discussed in this document However the team realizes that there is not enough time and expertise with the team to accomplish all the requirements So the team has concluded that all the critical priority and the high priority requirements will be implemented The moderate requirements will be considered for design and implemented if the team has enough time left after completing the high priority requirements The low priority requirements will be considered for the future items The team reached the above decision after wide research on the project frequent meeting with the stakeholders and group discussion among the team members 13 2 Research Team Auto Climatix has performed significant research to identify the technological and practical feasibility of this project The primary focus was to determine how components that must be implemented work in functioning systems what controls are required and what controls are beyond the scope or scheduling constraints of the project The primary technological areas of research were done by investigating the existing wiring
8. from power surges from normal vehicle use An available option for this is implementing a blowback circuit which would mitigate instances of this to occurrences outside of vehicle shutoff Software design consists of three categories The GUI signal processing and control output Signal processing is likely to be the most challenging component of the software design as it entails interpreting digital input to the microcontroller into meaningful values for the user Similarly system control output must be processed into digital and analog output An option available to mitigate the required processing load caused by signal conditioning is offloading the processing to the mobile device which will have an abundance of processing power compared to the onboard microprocessor Control output will have to be determined through algorithms taking the entire system status into account 13 4 Cost Analysis Team Auto Climatix has a maximum internal budget of 800 for the Automotive Climate Controller project This budget must only account for the mobile device the microcontroller connections between the vehicle hardware and the microcontroller and components exclusive to the mock up As the sponsor has provided vehicle hardware components the cost of these components has been excluded from the team s budget considerations Auto Climatix has arrived at the conclusion that the required components for the mock up may be delivered under budget based on curren
9. interact with the primary hardware component of the system and enables that system to control vehicle hardware The data transmitted between the microcontroller and tablet must be reliable and timely If the information is not timely control signals to critical systems could result in mechanical failure of the hardware or inadequate system performance Similarly unreliable signals between the devices could result in mechanical failure of the components or inadequate system performance Options available for handing cross platform communications include Blue Tooth wireless communications and serial connections Hardware design refers to the development of the circuitry unique to the microcontroller in addition to the signal conditioning that must be handled for the microcontroller to adequately interpret hardware status and respond with appropriate controls The microprocessor must be designed with handling multiple real time inputs and handling input and output to and from the mobile device The most significant challenge is designing a microprocessor that is modular and may take multiples of varying inputs These inputs may have different signal types complicating the signal conditioning required An option for handling this would be designing a central microcontroller handling communications to the hardware with independent modules managing signal conditioning Finally the hardware design must be made in such a way that the microcontroller is protected
10. the blower motor The vehicle batter shall supply power to the vacuum source The microcontroller shall be capable of monitoring vehicle battery status The microcontroller shall be capable of adjusting the power supply of the battery to the blower motor The power supply to the vacuum source shall be triggered by the microcontroller Significant amperage shall be defined as that which exceeds or meets the power supply of the blower motor 6 4 2 Source Team Auto Climatix 6 4 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the vehicle hardware components 6 4 4 Standards None 6 4 5 Priority High 6 5 The application shall control the vehicle hardware that is interfaced with the system 6 5 1 Description The microcontroller shall be capable of accepting and delivering analog and digital signals The microcontroller shall be capable of delivering output to and receiving input from at least twelve vehicle hardware components 02 12 2012 22 Auto Climatix System Requirements Specification Automotive Climate Controller 6 5 2 Source Team Auto Climatix 6 5 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals 6 5 4 Standards None 6 5 5 Priority Critical 6 6 The system shall control switchover valves 6 6 1 Description The system shall be capable of controlling a dual mode switchover valve
11. 0 10 5 21 12 41 76 gt 42 people months Development Time 2 5 42 20 35 9 24 gt 10 calendar months Acronyms FP Function Point FP count gt Function Point count Summarized Table Table 2 Size Estimation Summary Method Function Point Jones First Order CoCoMo Model Size Estimate 126 10522 Lines of code Effort Estimate 42 people months Schedule Estimate 9 Calendar Months 10 calendar months 02 12 2012 52 Auto Climatix System Requirements Specification Automotive Climate Controller 14 Future Items The following requirements are items that may be implemented at a later date These items currently extend beyond the schedule technical skills and budget allowed for the project These items additionally are not critical to the acceptance or performance of the Automotive Climate Controller 14 1 The microcontroller shall monitor pressure sensors 14 1 1 Description The microcontroller shall accept readings from vehicle pressure sensors The system shall monitor vehicle pressure sensors persistently while the vehicle is on 14 1 2 Constraints Schedule The sensors are in series with the control signal to the compressor clutch and therefore do not require manipulation Safety It is inadvisable to set all points of failure within the application 14 2 The system shall control the power seating 14 2 1 Description The microcontroller shall allow the user to manipulate electronic se
12. Climatix 7 1 3 Constraints A hardware malfunction can give faulty data to the temperature sensors resulting in improper actions taken to set the temperature Engine and extreme outside conditions may prevent desired temperature output 7 1 4 Standards None 7 1 5 Priority Moderate 7 2 The system shall achieve specified temperature on automatic mode promptly 7 2 1 Description The cabin should achieve the target temperature when the system is set to automatic mode in under ten minutes 7 2 2 Source Team Auto Climatix 7 2 3 Constraints A hardware malfunction can give faulty data to the temperature sensors resulting in improper actions taken to set the temperature Extreme conditions from the engine or outside may prevent the temperature from being achievable in ten minutes 7 2 4 Standards None 7 2 5 Priority Moderate 7 3 The mobile application shall be responsive to the user 7 3 1 Description The mobile application shall respond to the identifiable gestures within 2 seconds of the action 02 12 2012 27 Auto Climatix System Requirements Specification Automotive Climate Controller 7 3 2 Source Dr Gergely Zaruba 7 3 3 Constraints Processing speed of the mobile device 7 3 4 Standards None 7 3 5 Priority High 7 4 The application shall not have memory leak problem 7 4 1 Description The application shall be built with proper garbage collection strategy in order to avoid memory leak problem
13. Department of Computer Science and Engineering The University of Texas at Arlington Team Auto Climatix Project Automotive Climate Controller Team Members Raju Karki Robert Lopez Bishal Shrestha Hai Nguyen Anthony Vecera Last Updated 8 25 AM 4 03 2012 System Requirements Specification Automotive Climate Controller Table of Contents Table OE Contents sti it ti o ette a 2 Document Revision History 22seissseecasvensndceesnaien eo ia id AA Eed 3 Ee PIU tn E a 4 Lit O Table a e go EG e RR RG 5 1 Product Concept EE 6 Lil Purpose and Use quis adia tn a 6 1 2 e E AA EE 7 2 Product Description and Functional Overview ina tri 8 2 1 Feat res and Functions lisis 8 2226 Eternal mp ts ad UPS ene se vidas Goes ua saint ele E dag A E E ao 8 dios Product Interfaces ss de ar tell a Paste 8 So A E rae Sieaaas 10 4 Microcontroller Requirements mnoiviindi tdi tdi isa 15 3s PACA RE a O 18 6 Connect vit Req iremeniS TEE 21 Liz Performance R guirementS do cs i 27 O Safety ReEQUILEMENTS iii lao dali EA i ERG 30 9 Maintenance and Support Requirements A A A At 32 10 O 35 I Acopa e A ee 37 A RE 40 02 12 2012 2 Auto Climatix System Requirements Specification Automotive Climate Controller Document Revision History Revision Revision Number Date 0 3 1912 First Draft Completion First Draft Completion 4 03 12 Revised Draft Completion Revised Draft Completion Description Rationale 4 12 2012 Fin
14. The microcontroller shall be capable of determining the current status of the switchover valve The microcontroller shall be capable of determining if a fault has occurred at the switchover valve 6 6 2 Source Team Auto Climatix 6 6 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A hardware malfunction at the microcontroller may yield faulty status conditions for the switchover valves 6 6 4 Standards None 6 6 5 Priority Critical 6 7 The system shall control the blower motor 6 7 1 Description The system shall be capable of controlling airflow magnitude by adjusting output of the blower motor The system shall be capable of altering power delivered from the battery to the blower motor The system shall be capable of monitoring current flowing to the blower motor 6 7 2 Source Team Auto Climatix 6 7 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A hardware malfunction at the microcontroller may yield faulty status conditions for the blower motor 6 7 4 Standards None 6 7 5 Priority Critical 6 8 The system shall monitor the temperature sensors 02 12 2012 23 Auto Climatix System Requirements Specification Automotive Climate Controller 6 8 1 Description The system shall accept input from resistance based temperature sensors
15. al Draft Completion Final Draft Completion 02 12 2012 3 Auto Climatix System Requirements Specification Automotive Climate Controller Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8 Figure 9 List of Figures System EE 6 Automatico Mode CULMINA iia 9 Mantal Mode CULMO CUP RE sa eee aco ge Sad aaa ase eo 9 Debus Mode GUI Moca aaa 9 Individual ege EE 9 Automatic Mode Use Cass as 45 Manual Mode Use CASES tes tee eebe 46 Debtigsing Mode Use Cases siii binaria 47 02 12 2012 4 Auto Climatix System Requirements Specification Automotive Climate Controller List of Tables Table 1 F ncton Pont Ana ricos 50 Table 2 Size Estimatom EEN ee Ast gehen iia se te phe ali ee Al pe ee etna 52 02 12 2012 5 Auto Climatix System Requirements Specification Automotive Climate Controller 1 Product Concept This section describes the purpose use and intended user audience for the Automotive Climate Controller Automotive Climate Controller is the system that performs the function to detect the current climate condition inside and outside of a vehicle so that it can allow the user to manually or automatically adjust available hardware devices of the Air Conditioning system of the vehicle Users of the Automotive Climate Controller will be able to take advantage of the system by using their portable device to control the Air Conditioning system in their vehicle The old traditional AC system with inconvenient but
16. am Auto Climatix 8 5 3 Constraints None 8 5 4 Standards None 8 5 5 Priority High 02 12 2012 31 Auto Climatix System Requirements Specification Automotive Climate Controller 9 Maintenance and Support Requirements The major maintenance areas of the Automotive Climate Controller address hardware failure and software failure Team Auto Climatix will bear no responsibility for the maintenance or support of vehicle air conditioning components The requirements contained below are meant to address ease of maintenance and support 9 1 Team Auto Climatix shall provide direct maintenance and support through August 2012 9 1 1 Description Team Auto Climatix shall provide any maintenance or support requiring hardware replacement hardware redesign and software updates or fixes through August 2012 9 1 2 Source Team Auto Climatix 9 1 3 Constraints None 9 1 4 Standards None 9 1 5 Priority Critical 9 2 All major hardware components used in the system shall be replaceable and not permanent 9 2 1 Description If any major components stops working due to any unforeseen circumstances like damaged parts power surges etc then that component must be easily replaceable and not permanent as to ensure further operation of the system 9 2 2 Source Team Auto Climatix 9 2 3 Constraints None 9 2 4 Standards None 9 2 5 Priority Low 9 3 The system shall be delivered with all associated documents 9 3 1 Descrip
17. at settings including forward backward position seat tilt and seat heating 14 2 2 Constraints Schedule This requirement needs a separate UI 14 3 The mobile device shall provide radio controls in the vehicle 14 3 1 Description The mobile device shall be able to provide standard radio controls Turn on turn off volume adjustment FM band controls AM band controls 14 3 2 Constraints Schedule Inadequate time to design retrofitted stereo system in vehicle 14 4 The mobile device shall provide audio output through the vehicle speakers 14 4 1 Description The mobile device shall output audio cues through the vehicle s speakers 14 4 2 Constraints Budget Inadequate budget to retrofit stereo system in vehicle Schedule Inadequate time to design retrofitted stereo system in vehicle 14 5 The mobile device shall be removable from the vehicle 14 5 1 Description The system shall allow for the mobile device to be secured by the user externally from the microcontroller 02 12 2012 53 Auto Climatix System Requirements Specification Automotive Climate Controller 14 5 2 Constraints Schedule Allowing the mobile device to save state is not trivially done Additionally safety must take into account that this could only be done when the vehicle is turned off 14 6 The debugging mode shall show the problems that the system is able to identify 14 6 1 Description The debugging mode shall display a short message a
18. at of the outputs as well as allowing input signals to be generated 4 6 2 Source Dr Gergely Zaruba 4 6 3 Constraints None 4 6 4 Standards None 4 6 5 Priority High 02 12 2012 17 Auto Climatix System Requirements Specification Automotive Climate Controller 5 Packaging Requirements These packaging requirements will determine how the finished Automotive Climate Controller will look and feel prior to delivery for the users The Automotive Climate Controller needs two separated parts the software on mobile devices and a microcontroller Other devices that are required are enclosed in the package 5 1 The microcontroller hardware shall be fully assembled 5 1 1 Description All the parts of the system shall be connected to the microcontroller 5 1 2 Source Dr Gergely Zaruba 5 1 3 Constraints May need to connect to A C system of a vehicle to boot it up 5 1 4 Standards None 5 1 5 Priority High 5 2 The firmware shall be preloaded onto the microcontroller 5 2 1 Description The firmware that is integrated in a microcontroller shall be automatically loaded by the microcontroller whenever the system boots up 5 2 2 Source Dr Gergely Zaruba 5 2 3 Constraints The microcontroller does not have an individual battery and system boots up when the engine starts 5 2 4 Standards None 5 2 5 Priority High 5 3 The Automotive Climate Controller application shall be pre installed onto the mobile device
19. ation shall implement a manual mode that shall allow the user to manually select a preset AC output temperature select a preset air speed and determine vent settings The user shall be able to disable or enable the AC manually 3 7 2 Source Dr Gergely Zaruba 3 7 3 Constraints The engine of the automobile should be on in order for the application to be able to turn the AC on 3 7 4 Standards None 3 7 5 Priority Critical 3 8 The application shall have a debugging mode 3 8 1 Description The debugging mode shall show information of all vehicle hardware input to the system The debugging mode shall allow the user to manually adjust individual vehicle hardware components 3 8 2 Source Dr Gergely Zaruba 3 8 3 Constraints Some vehicle components are interdependent and can t be individually manipulated 3 8 4 Standards None 3 8 5 Priority Critical 02 12 2012 12 Auto Climatix System Requirements Specification Automotive Climate Controller 3 9 The debugging mode shall show the problems that the system is able to identify 3 9 1 Description The debugging mode shall perform system diagnostics and display a short message about the problem that the system was able to identify 3 9 2 Source Dr Gergely Zaruba 3 9 3 Constraints None 3 9 4 Standards None 3 9 5 Priority Future 3 10 The mobile application shall generate a log file of the system 3 10 1 Description The mobile application shall gen
20. bout the problem that the system was able to identify 14 6 2 Constraints Schedule Identifying specific signals that correspond to error states for each hardware item is well beyond the scope of the team s schedule 14 7 The mobile application shall generate a log file of the system 14 7 1 Description The mobile application shall write a log file of the system that records the permanent events like the installation of some inputs devices output devices system startup shutdown and also the hardware failure information 14 7 2 Constraints Budget Allocating a mobile device with sufficient storage is beyond the scope of the budget 14 8 The failure rate of the mobile application shall be less than a 1 10 000 uses 14 8 1 Description The system shall not fail more than once for 10 000 uses 14 8 2 Constraints Schedule Inadequate time to properly develop simulation for device Resources Impossible to allocate multiple devices to verify reliability of system 02 12 2012 54 Auto Climatix
21. d alterable flash shall allow field updating of the firmware 4 3 2 Source Dr Gergely Zaruba 4 3 3 Constraints None 4 3 4 Standards None 4 3 5 Priority Critical 4 4 The microcontroller shall include a timer 4 4 1 Description Microcontroller shall include a variety of timers as well like Programmable Interval Timer The timer shall either count down from some value to zero or up to the capacity of the count register overflowing to zero The timer shall be useful for devices such as thermostats 4 4 2 Source Dr Gergely Zaruba 4 4 3 Constraints None 4 4 4 Standards None 4 4 5 Priority High 4 5 The microcontroller shall use a high level programming language 4 5 1 Description The microcontroller shall use high level programming languages such as the C programming language The compiler shall make tools freely available to make it easier to adopt their hardware 4 5 2 Source Dr Gergely Zaruba 4 5 3 Constraints The developed program may not adopt the entire hardware environment 4 5 4 Standards None 4 5 5 Priority High 02 12 2012 16 Auto Climatix System Requirements Specification Automotive Climate Controller 4 6 The microcontroller shall use simulators 4 6 1 Description Microcontroller shall use simulators to analyze what the behavior of the microcontroller and their program should be as they were using the actual part The simulator shall show the internal processor state and also th
22. diagram of the vehicle a physical air conditioning console from a 1983 E Class Mercedes Benz and a more modern air conditioning diagram of a Nissan 350Z In this process Auto Climatix identified mechanically critical components of the vehicle that do not lend themselves to be integrated into the system while maintaining appropriate testing standards The compressor clutch was identified in this process as one such item that could not be interfaced with the system without compromising the mechanical integrity of the air conditioning system and testing standards required for implementation Additionally the team identified numerous redundant or arrayed systems that would reduce the initial project size estimates dramatically An additional research area was financial feasibility In the team s research it was determined that the most significant cost would be the mobile device Adequate mobile devices fell within a reasonable range for the team s budget premium devices can easily extend beyond the budget This limits the team to very specific operating system constraints for the development of the end user application 02 12 2012 48 Auto Climatix System Requirements Specification Automotive Climate Controller 13 3 Technical Analysis The automotive climate controller demands technical ability in three major areas Hardware design software design and cross platform communications Cross platform communication enables the mobile device to
23. direction in the GUI 12 8 4 THE USE CASE ENDS WITH The user sees the touched button highlighted on the GUI 12 9 The user enables debug mode 12 9 1 Scenario The user wants to debug automatic climate control mode using the installed Automotive Climate Controller 12 9 2 Actor s The user 12 9 3 THE USE CASE BEGINS WITH The user touches the Debug button on the Auto or Manual mode 02 12 2012 42 Auto Climatix System Requirements Specification Automotive Climate Controller 12 9 4 THE USE CASE ENDS WITH The user sees the Debug title highlighted on the bottom title bar of the GUI 12 10 The user gets diagnostic information about the individual vehicle hardware components 12 10 1 Scenario The user wants to view individual component status of the vehicle hardware components using the installed Automotive Climate Controller 12 10 2 Actor s The user 12 10 3 THE USE CASE BEGINS WITH The user picks the hardware that he she wants to debug from the list of the hardware components displayed on the GUI 12 10 4 THE USE CASE ENDS WITH The user sees the information about the individual hardware components the GUI 12 11 The user checks the individual hardware components 12 11 1 Scenario The user wants to check the individual hardware component using the installed Automotive Climate Controller 12 11 2 Actor s The user 12 11 3 THE USE CASE BEGINS WITH The user picks the action
24. e components 11 5 2 Requirement s addressed 3 8 11 5 3 Verification Procedure When the user touches the individual parts on the debug menu it should show the information about that individual component When the user picks the functionality that is specific to that hardware that functionality should be performed by the respective hardware part 11 6 The application shall have a meaningful GUI 11 6 1 Requirement s addressed 3 12 11 6 2 Verification Procedure The sponsor shall approve of the GUI after a visual inspection The sponsor shall verify that the GUI recognizes straight line commands by interacting with the GUI sliders 11 7 The microcontroller shall be programmable and shall provide real time response 11 7 1 Requirement s addressed 3 17 3 18 11 7 2 Verification Procedure The sponsor shall verify that the microcontroller exhibits real time response by adjusting individual hardware components from the software debug mode The sponsor shall then approve or disapprove of the exhibited response time seen during a visual inspection The response of the hardware shall exhibit that the microcontroller has been programmed to function within the system 11 8 The microcontroller shall control the vehicle hardware interfaced with the system 11 8 1 Requirement s addressed 5 5 5 9 11 8 2 Verification Procedure The sponsor shall verify that the system can control all interfaced vehicle hardware by adjustin
25. e mobile device shall terminate displays upon vehicle shutoff The mobile device shall resume data displays upon vehicle start up 6 2 2 Source Team Auto Climatix 6 2 3 Constraints The vehicle battery may be incapable of supplying needed power to the microcontroller resulting in output below 5V 6 2 4 Standards TIA 232 F 6 2 5 Priority High 6 3 The microcontroller shall supply power to the components that require minimal current 02 12 2012 21 Auto Climatix System Requirements Specification Automotive Climate Controller 6 3 1 Description The microcontroller shall supply power to the switchover valves The microcontroller shall supply power to the mono valve The microcontroller shall supply current to the temperature sensors The microcontroller shall supply current to the compressor clutch Components requiring minimal current are those components which do not require persistent current or require less equal current to the mono valve 6 3 2 Source Team Auto Climatix 6 3 3 Constraints The vehicle battery may be incapable of supply needed power to the microcontroller resulting in inadequate power supply being delivered to the vehicle hardware components 6 3 4 Standards None 6 3 5 Priority High 6 4 The vehicle shall supply power to the components that require significant amperage 6 4 1 Description The vehicle battery shall supply power to the microcontroller The vehicle battery shall supply power to
26. erate a log file of the system that records the system events like the installation of some inputs devices output devices system startup shutdown and also the hardware failure information The user shall be able to download the log file 3 10 2 Source Dr Gergely Zaruba 3 10 3 Constraints Storage capacity of the mobile device 3 10 4 Standards None 3 10 5 Priority Future 3 11 The application shall have a GUI that is clearly visible 3 11 1 Description The GUI of the application shall have visible components such as buttons scrolls labels etc that are visible to the people with in corrective vision from a distance of 4 feet 3 11 2 Source Dr Gergely Zaruba 3 11 3 Constraints None 3 11 4 Standards None 3 11 5 Priority Critical 3 12 The application GUI shall have meaningful icons and symbols 02 12 2012 13 Auto Climatix System Requirements Specification Automotive Climate Controller 3 12 1 Description The application GUI shall have icons and symbols related to the functionality of the icon symbols and following the standards 3 12 2 Source Dr Gergely Zaruba 3 12 3 Constraints None 3 12 4 Standards None 3 12 5 Priority High 3 13 The application GUI shall recognize the straight line gesture as the input 3 13 1 Description The applications GUI shall recognize the straight line gesture as the input like swipe slide push and hold It shall not have complicated gestures like panning a
27. etary constraints 3 1 4 Standards JOS and Android Programming Standards Android 2 X IOS 3 X 3 1 5 Priority Critical 3 2 The mobile device shall be connected to the microcontroller 3 2 1 Description The mobile device shall always be connected to the microcontroller wirelessly The application shall communicate with the microcontroller 3 2 2 Source Dr Gergely Zaruba 3 2 3 Constraints None 3 2 4 Standards TIA 232 F Bluetooth v1 0 3 0 3 2 5 Priority Critical 3 3 The mobile application shall have a standard wake up procedure 02 12 2012 10 Auto Climatix System Requirements Specification Automotive Climate Controller 3 3 1 Description The mobile device shall wake up when the key is moved from the off position to the ACC start position The application shall initiate previous user settings If no user setting is available the system shall assume default settings 3 3 2 Source Dr Gergely Zaruba 3 3 3 Constraints In the ACC position the compressor doesn t turn on So the A C doesn t work Only the airflow and the fan speed can be controlled in ACC position 3 3 4 Standards None 3 3 5 Priority High 3 4 The mobile application shall have a sleep mode 3 4 1 Description Sleep mode shall disable all system functions except for power delivery to the mobile device The mobile device shall go to sleep when the vehicle is turned off The application shall allow the user to set the application
28. ey shall drive external devices such as LEDs or motors 4 1 2 Source Dr Gergely Zaruba 4 1 3 Constraints None 4 1 4 Standards None 4 1 5 Priority High 4 2 The microcontroller shall provide real time response 4 2 1 Description The microcontroller shall provide real time response to events in the system Certain events or user inputs shall trigger an interrupt system signaling the processor to suspend the current instruction sequence and to begin a new service routine This new service routine shall perform any processing required based on the source of the interrupt before returning to the original instruction sequence Possible interrupt source shall be an internal timer overflow completing an analog to digital conversion a logic level change on an input such as from a button being pressed and data received on a communication link 4 2 2 Source Dr Gergely Zaruba 4 2 3 Constraints Interrupts may also wake a microcontroller from a low power sleep state where the processor is halted until required to do something by a peripheral event 4 2 4 Standards None 4 2 5 Priority Critical 02 12 2012 15 Auto Climatix System Requirements Specification Automotive Climate Controller 4 3 The microcontroller shall be programmable 4 3 1 Description The microcontroller shall be programmable The program shall fit in on chip program memory The program shall be field alterable flash or erasable read only memory The fiel
29. g individual component settings within the debug GUI 11 9 Electrical hardware shall implement fly back circuits for connections requiring high amperage or voltage 11 9 1 Requirement s addressed 7 1 02 12 2012 38 Auto Climatix System Requirements Specification Automotive Climate Controller 11 9 2 Verification Procedure The sponsor shall verify the existence of fly back circuits in circuit schematics and on the physical circuits The sponsor shall verify implementation by demonstrating that the microcontroller does not overload after system shutoff 11 10 Electrical wiring shall be insulated 11 10 1 Requirement s addressed 7 3 11 10 2 Verification Procedure The sponsor shall verify that performing a visual inspection of the prototype installation insulates wiring 02 12 2012 39 Auto Climatix System Requirements Specification Automotive Climate Controller 12 Use Cases The following section describes the use cases of the Automotive Climate Controller These use cases cover all the major processes that the system will be designed to accomplish Those tasks are categorized under four major modes that the system will be operating under The first one is the general mode where the system is not in any particular mode and the system is expected to go to a particular mode and perform general operations like starting and shutting down the system The next mode is the automatic mode where the system will only take the inpu
30. he mobile device s display A visual inspection by the sponsor may verify the wireless connection or a hardwired connection 11 3 The mobile application shall have an automatic mode 11 3 1 Requirement s addressed 3 6 11 3 2 Verification Procedure When the user specifies desired temperature in the application the environment of the cabin should change to the specified temperature within ten minutes When the user presses any other control in the automatic mode the application shall highlight the manual mode which means the application went to the manual mode from the automatic mode 11 4 The mobile application shall have a manual mode 11 4 1 Requirement s addressed 3 7 11 4 2 Verification Procedure When the user specifies desired temperature level in the application the environment of the cabin should change to the specified temperature within ten minutes When the user adjusts the fan speed using the button on the GUI the fan speed should change accordingly When the user picks the air direction from the presets the respective vents and the air flaps should open close respectively 11 5 The application shall have a debugging mode 02 12 2012 37 Auto Climatix System Requirements Specification Automotive Climate Controller 11 5 1 Description The debugging mode shall show information of all vehicle hardware input to the system The debugging mode shall allow the user to manually adjust individual vehicle hardwar
31. heating 12 6 1 Scenario The user wants to manually adjust the hotness or coolness of the cabin without specifying temperature using the installed Automotive Climate Controller 12 6 2 Actor s The user 02 12 2012 41 Auto Climatix System Requirements Specification Automotive Climate Controller 12 6 3 THE USE CASE BEGINS WITH The user touches either the or the button in manual mode to adjust the desired temperature level that are in the form of fixed presets 12 6 4 THE USE CASE ENDS WITH The user sees the adjusted indicator on the Air Temperature Range indicator 12 7 The user adjusts fan speed 12 7 1 Scenario The user wants to adjust the airflow output of the blower using the installed Automotive Climate Controller 12 7 2 Actor s The user 12 7 3 THE USE CASE BEGINS WITH The user touches either the or the button in manual debug mode to adjust the desired fan speed level that are in the form of fixed presets 12 7 4 THE USE CASE ENDS WITH The user sees the adjusted indicator on the Fan Speed indicator 12 8 The user specifies the air direction 12 8 1 Scenario The user wants to specify the airflow output locations using the installed Automotive Climate Controller 12 8 2 Actor s The user 12 8 3 THE USE CASE BEGINS WITH The user touches the appropriate button from the available buttons that have icons representing different preset vent flap
32. in this document The Automotive Climate Controller is used whenever the user desires climate control in their vehicle The system will be compatible with any mobile device that provides root access and implements a common mobile OS The device should have the ACC program installed and running It should be connected to the microcontroller 1 2 Intended Audience People who own a mobile device and a vehicle can take advantages of the Automotive Climate Controller A large portion of the US adult population owns a mobile device and similarly own vehicles With this in mind people of any socioeconomic class may use the Auto Climatix Climate Controller and expect to see an improvement in their vehicle s climate controller s performance However the target audience is actually those with older vehicles seeking to retrofit their A C systems to include proper climate controls without compromising styling Given the abundance of vehicles without luxury climate controls and the lack of current affordable solutions for the problem the product could establish itself as a viable solution or implementation of A C controls for vehicle manufacturers 02 12 2012 7 Auto Climatix System Requirements Specification Automotive Climate Controller 2 Product Description and Functional Overview This section provides the reader with an overview of the Automotive Climate Controller The primary operational aspects of the product include the manipulation of the te
33. ion for deployment in multiple car platforms Additionally the team is familiar with widely used industry tools Additionally the team has strong leadership and organizational skills 13 6 Schedule Analysis Team Auto Climatix has analyzed several estimation methods and accommodated our system to each one to determine the size effort and schedule of the project Size Estimates The first method used to determine the size of the project was function point estimation Table 11 1 gives an overview of the function point estimation performed on our system Table 1 Function Point Analysis Program Low Moderate High Function Point Totals Characteristic Complexity Complexity Complexity Number of inputs 6 3 0 4 4 6 42 Number of outputs 8 4 0 5 4 7 60 Inquiries 0 3 5 4 0 6 20 Logical internal files 0 7 1 10 0 15 10 External interface files 0 5 0 77 0 10 0 Unadjusted Function Points Total 132 02 12 2012 50 Auto Climatix System Requirements Specification Automotive Climate Controller Adjustment Factor 0 95 Total 125 4 The bold numbers indicate the number of function points and then they are multiplied by a function multiplier determined by using McConnell s table 8 2 The second method used to determine the size of the project was the COCOMO lines of code estimate Effort Estimation Jones First Order of Effort Analysis 125 4 Function points
34. ix 6 14 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A faulty vehicle status line could yield unexpected behavior from the water pump 6 14 4 Standards None 6 14 5 Priority Low 6 15 The system shall control the power seating 6 15 1 Description The system shall allow the user to manipulate electronic seat settings including forward backward position seat tilt and seat heating 6 15 2 Source Team Auto Climatix 6 15 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A faulty vehicle status line could yield unexpected behavior from the seat 6 15 4 Standards None 6 15 5 Priority Future 02 12 2012 26 Auto Climatix System Requirements Specification Automotive Climate Controller 7 Performance Requirements Although the Automotive Climate Controller is not going to be engaged in critical operations the product needs to get the temperature of the car cabin to a specified temperature within a reasonable time frame 7 1 The system shall alter the temperature of the cabin to within a few degrees of the temperature that was specified by the user 7 1 1 Description The temperature output to the cabin of the vehicle should be within 2 F degrees of what the target temperature of the system depicts 7 1 2 Source Team Auto
35. m Auto Climatix shall come with upgrade for major software issues until August 2012 02 12 2012 33 Auto Climatix System Requirements Specification Automotive Climate Controller 9 6 2 Source Team Auto Climatix 9 6 3 Constraints None 9 6 4 Standards None 9 6 5 Priority Moderate 9 7 Team Auto Climatix shall provide schematics and source code to customers after product support has expired 9 7 1 Description Team Auto Climatix shall make available product documentation source code and schematics readily available for a period of two years following August 2012 After this time period all warrantees and guarantees provided shall expire and the user shall maintain full responsibility for maintenance and support 9 7 2 Source Team Auto Climatix 9 7 3 Constraints None 9 7 4 Standards None 9 7 5 Priority Moderate 9 8 The debugging mode of the mobile application shall assist in detection of major problems in the system 9 8 1 Description The debugging mode shall assist the user to detect the major problems that arise during the operation of the system The debugging mode shall allow the user to individually control each parts of the system and look for the problems 9 8 2 Source Team Auto Climatix 9 8 3 Constraints None 9 8 4 Standards None 9 8 5 Priority High 02 12 2012 34 Auto Climatix System Requirements Specification Automotive Climate Controller 10 Other Requirements This section contains requi
36. mperature of the interior of older vehicles The initial implementation will focus largely on an early model 1980 s E Class Mercedes Benz Additionally the system shall be capable of obtaining diagnostic information about vehicle components that are connected to the Automotive Climate Controller End users will operate the vehicle s AC using the mobile device Maintenance will be performed through necessary hardware and software upgrades As mentioned before the key feature of this system is the ability to manipulate the temperature of the cabin of the vehicle the system is integrated into This is accomplished by connecting various portions of the old climate control system to the Automotive Climate Controller s microcontroller unit From there the microcontroller will send its signals to the various portions adjusting the portions as needed to bring the temperature of the cabin of the car to the temperature that was selected by the end user through his or her interactions with the touch screen interface The ability to obtain diagnostic information about vehicle components will be acquired in a similar manner as the adjusting of the temperature of the cabin 2 1 Features and Functions The product will allow users to control the climate control system of the early model 1980 s E Class Mercedes Benz car through a mobile device This mobile device will be connected to the microcontroller of the product The product will have three modes of o
37. nd rotation etc 3 13 2 Source Dr Gergely Zaruba 3 13 3 Constraints None 3 13 4 Standards None 3 13 5 Priority High 3 14 The application shall display a message in case of system failure 3 14 1 Description The application shall detect the failure of the system and display the application failure information if the system is not working at all 3 14 2 Source Dr Gergely Zaruba 3 14 3 Constraints None 3 14 4 Standards None 3 14 5 Priority High 02 12 2012 14 Auto Climatix System Requirements Specification Automotive Climate Controller 4 Microcontroller Requirements Microcontrollers are designed by Auto Climatix team for embedded applications that will work as a small computer on a single integrated circuit It is will be used to control the a c unit in the car The microcontroller will contain processor core memory and programmable input output peripherals The basic functionalities of microcontroller will be described below at the requirement section Requirements in this section must not be changed without specific agreement with the project sponsor 4 1 The system shall have a microcontroller unit 4 1 1 Description The system shall have a microcontroller unit with 40 I O pins The pins shall be software configurable to either an input or output state When these pins are configured to an input state they shall read sensors or external signals When these pins are configured to the output state th
38. nitor power input to the vacuum while the vacuum motor is active 6 10 2 Source Team Auto Climatix 6 10 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals The vehicle battery may be incapable of delivering sufficient power to the vacuum source yielding insufficient vacuum A hardware malfunction at the microcontroller may yield faulty status conditions for the vacuum Vacuum line failure may result in unexpected vacuum behavior 02 12 2012 24 Auto Climatix System Requirements Specification Automotive Climate Controller 6 10 4 Standards None 6 10 5 Priority High 6 11 The system shall control the compressor clutch of the system 6 11 1 Description The system shall control the compressor clutch The system shall monitor the compressor clutch s status The system shall trigger activation of the clutch when the user desires cooling capability from the AC 6 11 2 Source Team Auto Climatix 6 11 3 Constraints The vehicle battery may be incapable of supplying sufficient power to the microcontroller resulting in altered control signals A faulty pressure reading may result in unexpected compressor clutch behavior High or low pressure readings may prevent the compression clutch from engaging 6 11 4 Standards None 6 11 5 Priority Critical 6 12 The system shall monitor the pressure sensors of the system 6 12 1 Description
39. peration The modes of operation are the automatic mode the manual mode and the debug mode The automatic mode will allow users to specify a temperature into the system in order to have the car automatically attempt to adjust the temperature in the car The manual mode will allow users to control the disparate portions of the car s climate control system through the mobile device The debug mode will allow users to verify the status of all of the components of the system that are connected to the microcontroller of the system 2 2 External Inputs and Outputs The product requires user input from the touch screen interface The product requires connections to the microcontroller from the various portions of the old climate control system All portions of the system require power The product should adjust the temperature of the cabin of the car the system is installed in 2 3 Product Interfaces 02 12 2012 8 Auto Climatix System Requirements Specification Automotive Climate Controller The product will have a touch screen interface On the interface there will be a picture of the car with indicators for the status of the various vents The temperature of the car will be displayed as well Figure 3 Manual Mode GUI Mockup ON OFF Blower Mono Valve Vacuum Swithover Swithover Swithover Valve 1 Valve 2 Valve 3 Temp Sensor 1 Temp Sensor 2 Pressure Sensor Other part Other part Other part Other part Other part Othe
40. r part Figure 4 Debug Mode GUI Mockup Figure 5 Individual Component Debug 02 12 2012 9 Auto Climatix System Requirements Specification Automotive Climate Controller 3 Customer Requirements Customer requirements describe the basic functionalities usability and appearance of the product as required by the customer Team Auto Climatix gathered the following requirements in collaboration with project sponsor Dr Gergely Zaruba These requirements define the core functionalities of the Automotive Climate Controller as specified by the project sponsor and Team Auto Climatix These requirements specify what each end user should expect the product to do and or not do as well as the look and feel of the system It should be noted that these customer requirements are end user display specific as the customer is primarily concerned with the system s output Requirements in this section must not be changed without specific agreement with the project sponsor 3 1 The system shall use a mobile device 3 1 1 Description The system shall use a mobile device The mobile device shall have a capacitive touch screen The mobile device shall have at least a single button 3 1 2 Source Dr Gergely Zaruba 3 1 3 Constraints The mobile device shall utilize a common mobile OS having a wide release no older than 2009 The operating system of the mobile device shall not prohibit access to root controls The mobile device must not exceed budg
41. ram Automotive Climate Controller Specify Desired Cabin Temperature y Enable Manual Mode Enable Debugging Mode User Specify air direction Stop the System Figure 7 Automatic Mode Use Cases 02 12 2012 45 Auto Climatix System Requirements Specification Automotive Climate Controller 12 16 Manual Mode Use Cases Diagram Automotive Climate Controller Specify Magnitude of cooling heating Adjust Fan Speed Specify Air direction Enable Automatic User Mode NN Enable Debugging Mode Stop the System Figure 8 Manual Mode Use Cases 02 12 2012 46 Auto Climatix System Requirements Specification Automotive Climate Controller 12 17 Debugging Mode Use Cases Diagram Automotive Climate Controller et diagnostic information about individual hardware components Check individual components Enable Automatic Mode Enable Manual Mode Stop the System Enable Manual Mode Figure 9 Debugging Mode Use Cases 02 12 2012 47 Auto Climatix System Requirements Specification Automotive Climate Controller 13 Feasibility Assessment The Automotive Climate Controller has many components that require considerable knowledge of various topics such as circuit design and the car cooling cycle Thus it is necessary to conduct a preliminary feasibility assessment of the product The results have been broken up into six components and have been
42. rements that can be followed to develop more functions of the product after the main requirements have been accomplished and in order to extending scope of the product These requirements have lower priority than other requirements and they are only developed when all of other requirements are complete perfectly 10 1 The application shall provide radio controls in the vehicle 10 1 1 Description The application shall be able to provide standard radio controls Turn on turn off volume adjustment FM band controls AM band controls 10 1 2 Source Team Auto Climatix 10 1 3 Constraints The mobile device must support multi programming The radio functionality must not hinder any processing done to support the air conditioning systems 10 1 4 Standards None 10 1 5 Priority Future 10 2 The application shall provide audio output through the vehicle speakers 10 2 1 Description The application shall output audio cues through the vehicle s speakers 10 2 2 Source Team Auto Climatix 10 2 3 Constraints The mobile device must not interfere with existing audio output 10 2 4 Standards None 10 2 5 Priority Future 10 3 The mobile device shall be removable from the vehicle 10 3 1 Description The system shall allow for the mobile device to be secured by the user externally from the microcontroller 10 3 2 Source Team Auto Climatix 10 3 3 Constraints The system must immediately recognize and restore settings p
43. romptly upon the reintroduction of the mobile device to the system 02 12 2012 35 Auto Climatix System Requirements Specification Automotive Climate Controller 10 3 4 Standards None 10 3 5 Priority Future 10 4 The AC mockup shall simulate the standard functionality of an AC system 10 4 1 Description The mockup shall simulate the same functions of air conditioning system of a vehicle It shall be a prototype to supply customers to simulate operation of the product in their vehicle before they decide to assemble the product for using 10 4 2 Source Team Auto Climatix 10 4 3 Constraints None 10 4 4 Standards None 10 4 5 Priority Critical 02 12 2012 36 Auto Climatix System Requirements Specification Automotive Climate Controller 11 Acceptance Criteria After several discussions with the primary stakeholders it was agreed that the Automotive Climate Controller would be accepted as a completed product once the system being designed met the following criteria 11 1 The system shall use a mobile device 11 1 1 Requirement s addressed 3 1 11 1 2 Verification Procedure The sponsor shall verify that the device may be removed from the system and meets sponsor aesthetic standards 11 2 The mobile device shall be connected to the microcontroller 11 2 1 Requirement s addressed 3 2 11 2 2 Verification Procedure For wireless connectivity Bluetooth recognition of the microcontroller shall be apparent on t
44. s related to the particular part displayed on the GUI 12 11 4 THE USE CASE ENDS WITH The user sees the actual hardware performing the specified action 12 12 The user turns on the AC of the system 12 12 1 Scenario The user wants to turn on the ac of the vehicle using the installed Automotive Climate Controller for fuel economy 12 12 2 Actor s The user 12 12 3 THE USE CASE BEGINS WITH The user touches the Turn on Off AC button on GUI 12 12 4 THE USE CASE ENDS WITH The user sees the turn on off AC button getting highlighted on the GUI 12 13 The user turns off the AC of the system 02 12 2012 43 Auto Climatix System Requirements Specification Automotive Climate Controller 12 13 1 Scenario The user wants to turn off the ac of the vehicle using the installed Automotive Climate Controller for fuel economy 12 13 2 Actor s The user 12 13 3 THE USE CASE BEGINS WITH The user touches the Turn on Off AC button on GUI 12 13 4 THE USE CASE ENDS WITH The user sees the turn on off AC button getting un highlighted on the GUI 12 14 General Use Cases Diagram Automotive Climate Controller Start the System Enable Debugging Mode Enable Automatic Mode User Enable Manual Mode Stop the System Figure 6 General Use Cases 02 12 2012 44 Auto Climatix System Requirements Specification Automotive Climate Controller 12 15 Automatic Mode Use Cases Diag
45. s to be disconnected from the vehicle The Automotive Climate Controller will then be connected to the vehicle s air conditioning components as described in the user s manual Then the Automotive Climate Controller will then be mounted to the vehicle in the manner as described in the user s manual of the system Finally the mobile device will be affixed to the dashboard of the vehicle as described by the user s manual of the system 5 5 2 Source Team Auto Climatix 5 5 3 Constraints The manual shall only provide instruction for connection for the specified vehicle The manual may not be indicative of all vehicle configurations 5 5 4 Standards None 5 5 5 Priority High 02 12 2012 19 Auto Climatix System Requirements Specification Automotive Climate Controller 5 6 The Automotive Climate Controller shall come with the necessary components to provide power to the system 5 6 1 Description The system shall come with the various cables to be used to connect the microcontroller of the system with the car battery of the vehicle of which the system is to be installed on The microcontroller will receive power from the car battery of the vehicle The microcontroller will then provide power to all components that are not given power by other vehicle systems These steps will be explained to the user through the user s manual of the system 5 6 2 Source Team Auto Climatix 5 6 3 Constraints The manual shall only provide ins
46. t from the user and adjust the temperature of the vehicle by taking the temperature input from the user Manual mode is little more sophisticated that automatic mode in the sense that the user gets to pick more choices and the user has more control over the system The last mode meaningful GUI is the mode to check the system hardware and the system status So the followings are the individual tasks that the user of the system will be able to do The description of those use cases is followed by the categorized visual representation of the use cases in form of use case diagram 12 1 The user starts the system 12 1 1 Scenario The user wants to activate vehicle climate controls using the installed Automotive Climate Controller 12 1 2 Actor s The user 12 1 3 THE USE CASE BEGINS WITH The user switches the key position from off to ACC Start position 12 1 4 THE USE CASE ENDS WITH The user sees the startup screen on the mobile device 12 2 The user stops the system 12 2 1 Scenario The user wants to stop vehicle climate controls using the installed Automotive Climate Controller 12 2 2 Actor s The user 12 2 3 THE USE CASE BEGINS WITH The user switches the position of the key from ACC start position to off position or presses the OFF button in the application 12 2 4 THE USE CASE ENDS WITH The user sees the blank screen on the mobile device 02 12 2012 40 Auto Climatix System Requirements Specification Automo
47. t market costs The availability of used and working condition items particularly touch screen mobile devices from previous senior design 02 12 2012 49 Auto Climatix System Requirements Specification Automotive Climate Controller projects or the availability of said items at a discount from online retailers might drastically diminish the required cost of the automotive climate controller mockup 13 5 Resource Analysis Team Auto Climatix comprises of two software engineering students two computer science students and one computer engineering student The analysis of these resources indicates that the team has significant advantages in developing stand alone applications and architectural and detailed design The analysis also shows that the team has marked deficiencies in the development of embedded systems circuit design programming embedded systems and understanding of the mechanics of the system The complete lack of experience in mobile programming is not seen as a considerable risk as the most prevalent mobile operating systems utilize programming languages derived from languages seen as relative strengths within the team specifically Java C and C The largest risk associated with the project is derived from our reliance on a single team member for embedded system expertise and another for understanding the mechanics of the system The team s strength in programming is seen as an advantage in the development of a modular applicat
48. tion The system shall be deliverable with all associated documents like System Requirements Specification Architecture Design Specification Detailed Design Specification and the Project Charter 02 12 2012 32 Auto Climatix System Requirements Specification Automotive Climate Controller 9 3 2 Source Team Auto Climatix 9 3 3 Constraints None 9 3 4 Standards None 9 3 5 Priority High 9 4 Team Auto Climatix shall be available to fix any hardware and or software issues 9 4 1 Description If any hardware or software issues exist in the system team Auto Climatix shall be available anytime to fix them This guarantee shall remain valid through August 2012 9 4 2 Source Team Auto Climatix 9 4 3 Constraints None 9 4 4 Standards None 9 4 5 Priority High 9 5 The systems software and hardware shall be tested frequently 9 5 1 Description The software use to communicate with the system s hardware and microcontroller shall be tested frequently to ensure it is functioning properly Diagnoses screen shall be able to notify any identified irregularities so that the problem can be fixed Frequently is defined as at least once per function All changes to working functions shall be tested immediately upon implementation 9 5 2 Source Team Auto Climatix 9 5 3 Constraints None 9 5 4 Standards None 9 5 5 Priority High 9 6 Team Auto Climatix shall provide upgrades for any software issues 9 6 1 Description Tea
49. tive Climate Controller 12 3 The user enables automatic climate control 12 3 1 Scenario The user wants to enable automatic climate control mode using the installed Automotive Climate Controller 12 3 2 Actor s The user 12 3 3 THE USE CASE BEGINS WITH The user touches the Auto button on the Manual Debug or main page of the GUI 12 3 4 THE USE CASE ENDS WITH The user sees the Auto title highlighted on the title of the GUI 12 4 The user enables manual mode 12 4 1 Scenario The user wants to enable manual control of the vents fan and temperature range using the installed Automotive Climate Controller 12 4 2 Actor s The user 12 4 3 THE USE CASE BEGINS WITH The user touches the Manual button on the Auto Debug or main page of the GUI or the user specifies manual settings in auto mode 12 4 4 THE USE CASE ENDS WITH The user sees the Manual title highlighted on the title of the GUI 12 5 The user specifies desired cabin temperature 12 5 1 Scenario The user wants to set the cabin to a specific temperature using the installed Automotive Climate Controller 12 5 2 Actor s The user 12 5 3 THE USE CASE BEGINS WITH The user touches either the or the button in automatic mode to adjust the desired temperature 12 5 4 THE USE CASE ENDS WITH The user sees the temperature number change 12 6 The user specifies magnitude of cooling or
50. to sleep mode from any screen 3 4 2 Source Dr Gergely Zaruba 3 4 3 Constraints In the ACC position the compressor doesn t turn on So the A C doesn t work Only the airflow and the fan speed can be controlled in ACC position 3 4 4 Standards None 3 4 5 Priority High 3 5 The mobile application shall wake up when the user touches the screen 3 5 1 Description The mobile application shall wake up when the user provides system recognizable input 3 5 2 Source Dr Gergely Zaruba 3 5 3 Constraints The mobile application shall be in sleep mode 3 5 4 Standards None 3 5 5 Priority High 3 6 The system shall have an automatic mode 02 12 2012 11 Auto Climatix System Requirements Specification Automotive Climate Controller 3 6 1 Description The automatic mode shall manipulate cabin temperature to the user s desired temperature This mode shall calculate fan speed heating and cooling output and vent settings using input from the system temperature The system shall go to the manual mode when the user modifies anything from the automatic mode setting other than the temperature setting The system shall escape to manual mode when the user modifies anything from the automatic mode setting other than the temperature setting 3 6 2 Source Dr Gergely Zaruba 3 6 3 Constraints None 3 6 4 Standards None 3 6 5 Priority Critical 3 7 The system shall have manual mode 3 7 1 Description The applic
51. tons will be replaced by user friendly and convenient Automotive Climate Control System Figure 1 System Concept 1 1 Purpose and Use Mobile devices are developing rapidly and have a crucial role in our society They contribute to the process of economic development and raise quality of life People are extremely familiar with these 02 12 2012 6 Auto Climatix System Requirements Specification Automotive Climate Controller devices and are now willing to use them to aid in their own businesses Automotive Climate Controller is a man in the middle system meant to modernize the air conditioning systems of older vehicles by combining the older system with a mobile device The aim of this marriage of old and new technology is to provide users of the Automotive Climate Controller the most convenient and comfortable solution for delivering luxurious climate control Auto Climatix will give drivers of older vehicles another method to manually or automatically control the air conditioning system in their vehicle by interfacing the existing system with a mobile device Users can choose the automatic mode of the system delivering a classic automatic climate controlled environment and eliminating for user input to achieve desired comfort To perform this function the system processes information from sensors attached to the vehicle through a microcontroller The microcontroller is heart of the system which will be introduced in more detail later
52. truction for connection for the specified vehicle The manual may not be indicative of all vehicle configurations 5 6 4 Standards None 5 6 5 Priority High 02 12 2012 20 Auto Climatix System Requirements Specification Automotive Climate Controller 6 Connectivity Requirements Automotive climate control systems are not universal among vehicles It is beyond the scope of the project to make a truly universal controller for all automobiles The following requirements are meant to address the immediate requirements for implementation in the climate controlling system specified by the sponsor The requirements directly address the communications between all devices connected to the microcontroller either wired or wirelessly 6 1 The mobile device and microcontroller shall actively communicate 6 1 1 Description The mobile device shall transmit data to the microcontroller at least once per second The microcontroller shall transmit system status data to the mobile device at least once per second 6 1 2 Source Team Auto Climatix 6 1 3 Constraints None 6 1 4 Standards None 6 1 5 Priority Critical 6 2 The microcontroller shall supply power to the mobile device 6 2 1 Description The microcontroller shall constantly supply 5v to the mobile device The microcontroller shall not output in excess of 5v to the mobile device The microcontroller shall persist in delivering power to the mobile device after vehicle shut off Th

ACC: Automotive Climate Controller

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