PFI Driver Module Kit User`s Manual D000006 Rev F
Contents
1. Drivven Inc 2009 e PFI Driver Module Kit User s Manual e D000006 Rev F 23 Drivven Inc PFI Driver Module Kit pfi_peaktime2ticks_revf vi This VI converts PFI Driver PeakTime in milliseconds to clock ticks required by the FPGA VI pfi vt xa revx vi Connector Pane PeakTime msec Controls and Indicators set PeakTime msec PFI Driver PeakTime in milliseconds Lusi Ticks PFI Driver PeakTime in clock ticks to be wired to the PeakTime element of the PFIControl cluster of the FPGA VI pfi vt xa revx vi Drivven Inc 2009 e PFI Driver Module Kit User s Manual e D000006 Rev F 24 Drivven Inc PFI Driver Module Kit Fuel Command Scheduling Notes The PFI Vis provide features that ensure the best possible fuel command delivery even while the CPU makes modifications to StartPosition EndPosition and Duration asynchronously to engine position Modifications to Duration 1 Duration can be modified at any time 2 If Duration is modified during the fuel pulse to a value less than the already accumulated duration then the pulse is immediately terminated 3 If Duration is modified during the fuel pulse to a value greater than the already accumulated duration then the pulse is continued to the new value of Duration unless CutoffPosition is encountered first 4 f Duration is modified after the end of the fuel pulse but before CutoffPosition to a value less than the already accumulated duration for the cycle then n2. 0 the low side switch will remain open While PWMPulseWidth is greater than or equal to PWMPeriod the low side switch will remain closed Values larger than 20 bits will roll over from zero Drivven provides pfi lowside2ticks revf vi in the lowside function group in the RT function palette This VI can be implemented at the LabVIEW RT level for converting PWM frequency and duty cycle to PWMPeriod ticks and PWMPulseWidth ticks PWMPulseWidth uint32 clock ticks DutyCycle 20 000 Frequency Hz FuelSparkSupervisor This cluster input must be wired directly from the FuelSparkSupervisor cluster output of a Drivven EPT VI PFILSPinlnput These boolean controls must be connected to their corresponding FPGA I O Node input item PortFuelData Cluster of Boolean flags indicating cutoff flags open circuits short circuits and module present CutoffFlagX Set to TRUE when CurrentPosition from the EPT VI equals CutoffPosition CutoffFlag can be used by the CPU as interrupt flags if necessary to perform calculations synchronous with crank position CutoffFlag is cleared by setting CutoffFlagClr TRUE PFiFaultOpenX Set to TRUE when an open circuit is detected for the port fuel injector The flag is cleared when the condition is removed TF PFlFaultShortX Set to TRUE when a short circuit is detected for the port fuel injector A short circuit automatically disables the channel until the flag is cleared by the corresponding PFIFaultClr ModulePres
3. D000006 Rev F 11 Drivven Inc PFI Driver Module Kit Battery or Power Supply 12V Typical gt 5A e Automotive 5A Fuse Relay or Actuator Relay or Actuator Relay or Actuator Relay or Actuator PFI Module Connector Figure 6 Connecting general purpose solenoids to the low side driver channels 0 1 2 3 4 5 6 D 8 9 Notes 1 Use 18AWG or larger diameter wire 2 A CompactHIO controller may be powered by the same power source or by an isolated power source If the cRIO controller is powered by the same battery and this battery is used for cranking the engine then it is possible that the battery voltage will drop below 9V during cranking causing the cRIO controller to reset This can be prevented by using a small backup battery and a diode pack for the cRIO controller Please contact Drivven for recommended parts and connections Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 12 Drivven Inc PFI Driver Module Kit Software Installer The PFI Driver Module Kit is provided with an installer package which may be downloaded from Drivven s Sharepoint website after obtaining login access from Drivven User s may go to http portal drivven com SoftwareDownload and enter the provided username and password to gain access to the specific product installer packages which have been purchased The installer packages are executables which should be run on the intended
4. Rev F 6 Drivven Inc PFI Driver Module Kit Port Fuel Injector Drivers Each PFI driver channel is capable of driving low or high impedance port fuel injectors Driving Low Impedance Injectors Low impedance injectors will have approximately 2 ohms resistance across the solenoid The low resistance allows higher current through the solenoid to enable faster valve opening times However the high current is not needed for the entire duration of the injection event in order to keep the valve open The initial current level is referred to as the peak current and the current level for the remaining injection duration is referred to as the hold current The standard configuration for the PFI drivers is a peak current of 4 amps and a hold current of 1 amp At the beginning of each injection event the driver attempts to control the injector at 4 amps for the requested peak time refer to Software for PFI controls When the peak time expires the current control folds back to the hold level of 1 amp for the remaining duration of the event The requested peak time is updated at 200 usec intervals If for the entire duration of the injection event neither peak nor hold current levels are reached then an open circuit will be reported for the channel It is possible that an open condition may be falsely reported under certain conditions even though a fuel injector is properly connected Examples of this would be very low battery voltage poor connection
5. development computer having LabVIEW development tools installed After installing the package a Start gt Programs gt Drivven gt ProductRelease menu item will be added to the desktop The specific product will have an example LabVIEW project appear under the Examples menu and the user manual will appear under the Manuals menu User s may copy and open the example project to experiment with the module or use as a starting point for a new application All software files example projects and documentation are installed to C Program Files National Instruments LabVIEW X X vi lib addons DrivvenProductRelease When working with block diagrams user s will notice a Drivven function palette added to the standard LabVIEW palette specific for the RT or FPGA target VIs for a specific Drivven product will be categorized according to product name Also some Drivven products will install RT and FPGA VIs under a General function palette which is intended to be used across multiple products Requirements The Drivven VIs require LabVIEW 8 5 Full Development or later gt LabVIEW RT Module 8 5 or later gt LabVIEW FPGA Module 8 5 or later gt NI RIO 2 4 or later gt Drivven EPT VI The FPGA VI supplied with this kit cannot generate fuel commands without the supervision of an engine position tracking EPT VI from Drivven The EPT VI provides the necessary output cluster to be wired to the FuelSparkSupervisor input cluste
6. is internally limited to 24 bits Values larger than 24 bits will roll over from zero Drivven provides time2ticks vi in the General RT VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting duration in milliseconds to FPGA clock ticks Duration uint32 clock ticks Duration msec 40 000 PFIFaultCirX When TRUE clears the corresponding port fuel injector short circuit fault flag 4 LowSideControl This cluster of parameters enable each channel and control the PWM action to the lowside switches ICH PWMEnableX When TRUE the PWM controller is enabled When FALSE default the PWM controller is disabled LSFaultCirX When TRUE clears the corresponding low side driver short circuit fault flag PWMPeriodX The time period between leading edges of low side switch closure PWMbPeriod is entered in terms of 2 MHz clock ticks and is internally limited to 20 bits This provide a maximum period of 0 524 seconds or a frequency of 1 9 Hz and a resolution of 500 nsec Values larger than 20 bits will roll over from zero Drivven provides pfi lowside2ticks revf vi in the lowside function group in the RT function palette This VI can be implemented at the LabVIEW RT level for converting PWM frequency and duty cycle to PWMPeriod ticks and PWMPulseWidth ticks Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 18 Drivven Inc PFI Driver Module Kit H BE PWMPeriod uin
7. DRIVVEN PFI Driver Module Kit User s Manual D000006 Rev F January 2009 DRIVVEN WWW DRIVVEN COM Drivven CompactRIO PFI Driver Module Part D000006 4 Ch Peak Hold Port Fuel Injector Driver 4 Ch Low Side Switch PWM Operation oon E om 45 wn ec Drivven Inc e 12001 Network Blvd Bldg E Suite 110 San Antonio Texas 78249 USA Phone 210 248 9308 Web www drivven com E mail info drivven com Drivven Inc PFI Driver Module Kit Contents Tarode e d 3 luin 4 ee E 4 Pon ine m Ee 5 Platform Compatibility ciescoceessaseraarnscose ero dre tha SUE n ra ia raain 6 Post Puel mieclor DELUGUS e EE E toassasnemiesuceess unane 7 POW SAS DIV I MERE T 11 SOE a A E A A EE E 13 Creatine a LabVIEW unc M 14 ES T Doca m MGA eebe 17 Pe Command Eeer 25 Warning About FPGA I O Node Wung ENEE 26 Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 2 Drivven Inc PFI Driver Module Kit Introduction The Port Fuel Injector Driver Module Kit provides a CompactRIO cRIO module for driving low and high impedance Port Fuel Injectors PFI and general purpose automotive solenoid valves The kit includes a LabVIEW FPGA VI for controlling each driver channel Each PFI driver is individually controlled for timing and duration Each general purpose low side solenoid driver is PWM contro
8. VIEW RT level The FPGA VI must be placed within a Single Cycle Loop SCL of a LabVIEW FPGA block diagram The SCL must execute at the default clock rate of 40 MHz The FPGA VI requires a pre synthesized netlist file having a matching name and an extension of ngc The netlist file must be located in the same directory as the matching VI The installer will place this file in the LabVIEW addons directory along with the FPGA VI The Pinlnput and PinOutput clusters are wired to LabVIEW FPGA I O nodes which are configured for a cRIO controller chassis or a cRIO R Series expansion chassis Refer to the LabVIEW FPGA documentation for details about creating and configuring FPGA I O nodes Connector Pane PortFuelControl PortFuelData Low5 ideControl ow5SideData FuelSparkSupervisor x PPTL SPinQutput PFILSPinInput Controls and Indicators PortFuelControl This cluster of parameters enable each channel and schedules injection events for the PFI channels FuelEnableX When TRUE the fuel command is enabled When FALSE default the fuel command is disabled FuelModeX When FALSE default fuel pulses are generated according to StartPosition or EndPosition depending on the VI used This is the normal mode of operation When TRUE a single fuel pulse is generated immediately upon receiving a TRUE StartNow input The pulse will be generated with the requested Duration StartNow must be reset to FALSE in order to generate another p
9. cted until the error flag is cleared in software Even though the short circuit detection and disable feature is present it is strongly recommended that the wiring harness include a 5A automotive fuse for four high impedance injectors as shown in Figure 5 It is recommended that peak time be set to zero when controlling high impedance injectors Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 8 Drivven Inc PFI Driver Module Kit Figures 3 and 4 represent a current trace of a high impedance injector if one of the injector leads were monitored with a current probe and oscilloscope Current Amps Valve Opening Time Figure 3 Hold current reached and controlled Current Amps Valve Opening Time Figure 4 Hold current never reached WARNING Do not attempt to drive low impedance injectors with the general purpose low side switch drivers The low side drivers are only rated for 1 2 amps continuous The resulting higher current levels could damage the low side drivers Driven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 9 Drivven Inc PFI Driver Module Kit Battery or Power Supply 12V Typical 55A mE Automotive 5A Fuse Gs Ba ZOE CZ O PFI Module Connector Figure 5 Connecting port fuel injectors to the driver module Notes 1 Use 18AWG or larger diameter wire 2 A CompactRIO controller may be powered by the same powe
10. eak Time 1 2 msec Current Amps Valve Opening Time Figure 2 Peak hold current profile Driving High Impedance Injectors High impedance injectors may be used with the PFI driver circuits without any hardware or software configuration changes High impedance injectors will have approximately 12 ohms resistance across the solenoid Typically less than 1 amp is required to open and hold the solenoid valve The software requested peak time will not affect proper operation of a high impedance injector However depending on the actual resistance of the solenoid and the actual battery voltage the injector may saturate at varying current levels If the peak time were set to a non zero value then the driver circuit would attempt to control current to 4 amps during the requested peak time Obviously this current level will never be reached because the solenoid resistance is too high The hold current level of 1 amp may or may not be reached depending on the previously mentioned variables of resistance and battery voltage If the hold current level is reached then current control will take effect as with a low impedance injector The open circuit flag should be ignored when driving high impedance injectors because the hold current level of 1 amp may never be reached thus reporting a false open circuit Short circuit detection operates identically to that of low impedance injector control and the channel will be disabled if a short is dete
11. ent Set to TRUE when Drivven software properly detects the module is powered and present in the expected slot LowSideData Cluster of Boolean flags indicating open circuits and short circuits rri LSFaultOpenX Set to TRUE when an open circuit is detected for the low side driver The flag is cleared when the condition is removed LSFaultShortX Set to TRUE when a short circuit is detected for the low side driver A short circuit automatically disables the channel until the flag is cleared by the corresponding LSFaultClr PFILSPinOutput The boolean indicator named IDSelectEn must be connected to a Set Output Enable method of an FPGA I O Method Node The boolean indicator named IDSelectOut must be connected to a Set Output Data method of an FPGA I O Method Node The remaining boolean indicators must be connected to their corresponding FPGA I O Node output item Drivven Inc 2009 e PFI Driver Module Kit User s Manual e D000006 Rev F 22 Drivven Inc PFI Driver Module Kit pfi_lowside2ticks_revf vi Converts frequency and duty cycle to 2MHz clock ticks to be wired to the PWMPeriod and PWMPulseWidth inputs of the PFI FPGA VI Connector Pane Frequency Hz LSPeriodTicks DutyCycle 9 0 L5PulseWidthTicks scLh Frequency Hz PWM Frequency specified to the lowside channel DutyCycle 96 PWM Duty Cycle specified to the lowside channel LSPeriodTicks PWM period in 2MHz clock ticks LSPulseWidthTicks PWM pulse width in 2MHz clock ticks
12. ever Drivven does not recommend using this feature because the module names which are automatically assigned are not meaningful Mod1 Mod etc and can lead to coding mistakes when wiring the Drivven FPGA VIs to the I O nodes Adding the modules to the project manually as described above is still the recommended method Drivven Inc 2009 e PFI Driver Module Kit User s Manual D000006 Rev F 15 Drivven Inc PFI Driver Module Kit Brief Glossary of Terms CAD Crank Angle Degrees There are 360 CAD per two stroke cycle or one crankshaft rotation There are 720 CAD per 4 stroke cycle or two crankshaft rotations In a 4 stroke engine the camshaft completes exactly one rotation per two rotations of the crankshaft There are two strokes of the piston up and down within the cylinder during a single rotation of the crankshaft A single stroke of the piston covers 180 CAD EXTRAP Level of EPT Position Extrapolation This is a fixed power of two by which the angular resolution of tracked crankshaft position is improved over the physical teeth alone For example if the EPT VI has a fixed extrapolation level of 7 then the crank angle resolution between each physical tooth is improved by a factor of 2 7 128 CAT Crank Angle Ticks Single unit of angular measure reported by the CurrentPosition output of the EPT VI Reported as a power of two angular ticks of crank position travel having a resolution dependent on EXTRAP and the number of ph
13. functions within the module The CompactRIO 5V source is active whenever the CompactRIO or R Series Expansion Chassis is properly powered The module should only be powered at the HD15 connector by plugging it into a CompactRIO or R Series Expansion Chassis The module s HD15 connector should not be connected to any other device Another required power connection is at the external screw terminal connector The terminals are labeled BATT 0 and GND 9 Typical power sources will be from automotive 12V or 24V battery systems However the module can accept power from a range of 6V to 32V With no actuators connected the module requires up to 100mA from the external supply However the external supply must be capable of powering the actuators connected to the module Therefore a battery or power supply capable of 10A may be necessary under full load The external battery power ground is completely isolated within the module from the CompactRIO 5V supply ground However the external battery ground and the CompactRIO ground may be connected externally In order for the module to be recognized by the Drivven FPGA sub VI it must be powered by the external supply Warning The external battery supply input terminals are not reverse voltage polarity protected Connecting power to the module in reverse polarity will damage the module This event is not covered by the warranty Please refer to the DrivvenReverseBatteryNotice pdf document available
14. gt C Series Modules 12 Select the New Target or Device radio button and double click on the C Series Module in the Targets and Devices list In the following dialog select the desired Drivven module at the bottom of the Module Type list The Drivven modules will be appended 2 9 4 D D M 9 Drivven Inc 2009 e PFI Driver Module Kit User s Manual D000006 Rev F 14 Drivven Inc PFI Driver Module Kit there if any Drivven module software has been installed Select the appropriate module location Finally specify an appropriate name for the module which will later appear in the FPGA I O nodes in the FPGA block diagram Having meaningful module names is important for preventing coding mistakes 13 After adding a module to the project a folder will automatically be added to the project having the same module name given in the module configuration dialog The folder will contain the FPGA I O pins for the module slot These I O pins can be selected in the block diagram when connecting the module VI Pinlnput and PinOutput clusters to FPGA I O nodes The example application discussed below should be consulted for further details about connecting the Pinlnput and PinOutput clusters to FPGA I O nodes Within the example projects notice the FPGA I O node elements having module name prefixes 14 Some Drivven modules can be automatically recognized by LabVIEW when adding cRIO modules to the project How
15. ill cause strange behavior of the spark module or possible damage IDSelectEn S im ADComba SPI Clk T PI ADCombo SPICS 0105 P DIO7 F IU ADCombo SPI MOSI DIO7 P Figure 4 Representative FPGA output node for ADCombo with correct output item selection IDSelectEn m uc IDSelectOut E JD ADCombo sPrCk 5 DIOS Mu Spark SPICS DIO5 P PIU ADCombo SPI MOSI DIO 7 P DIO Figure 5 Representative FPGA output node for ADCombo with incorrect output item selection for DIO5 This will cause strange behavior or damage to the spark module Applying meaningful names to the modules within the project can help identify these coding mistakes Drivven Inc 2009 e PFI Driver Module Kit User s Manual e D000006 Rev F 26
16. ing FPGA I O nodes Connector Pane PortFuelControl PortFuelData LowSideControl LowSideData FuelSparkSupervisor PFILSPinOutput PFILSPinInput Controls and Indicators PortFuelControl This cluster of parameters enable each channel and schedules injection events for the PFI channels FuelEnableX When TRUE the fuel command is enabled When FALSE default the fuel command is disabled FuelModeX When FALSE default fuel pulses are generated according to StartPosition or EndPosition depending on the VI used This is the normal mode of operation When TRUE a single fuel pulse is generated immediately upon receiving a TRUE StartNow input The pulse will be generated with the requested Duration StartNow must be reset to FALSE in order to generate another pulse via this method StartNowX See FuelMode CutoffFlagClrX When TRUE the CutoffFlag within the PortFuelData cluster is cleared E StartPositionX This control will be available when using the pfi vt sa revx vi Fuel pulses are generated with a leading edge coinciding with StartPosition The length of the pulse will be according to Duration The units of StartPosition are CAT Drivven provides Offset2CAT vi in the General RT VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting StartPosition in CAD with respect to a cylinder TDC to CAT ed CutoffPositionX All fuel pulse activity is Cutoff at CutoffPosition and reset f
17. lled capable of 0 100 duty cycle operation Features gt 4 channel low or high impedance PFI driver o Peak hold current control for low impedance injectors o 4 amp peak 1 amp hold current profile standard configuration o Tunable peak duration o Open short circuit detection and reporting with short circuit disable gt 4 channel general purpose low side solenoid driver o 1 2 amp continuous duty o PWM controlled 0 100976 duty cycle operation 2Hz 10kHz frequency operation 500 nanosecond resolution o Open short circuit detection and reporting with short circuit disable External power supply of 6 32V Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 3 Drivven Inc PFI Driver Module Kit Pinout BATT L I LSs2 LS3 Ls4 PEN PFI2 PER PFI GND Hardware The PFI Driver Module Kit provides four port fuel injector drivers and four general purpose low side solenoid drivers in a National Instruments CompactRIO module Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 4 Drivven Inc PFI Driver Module Kit Powering the Module The PFI Driver module requires power from two different sources One source is from the CompactRIO backplane male high density D Sub 15 pin HD15 connector which mates with the module s female HD15 connector This power source provides a regulated 5 volts and ground to various digital logic
18. msec 40 000 PFIFaultCIrX When TRUE clears the corresponding port fuel injector short circuit fault flag 4 LowSideControl This cluster of parameters enable each channel and control the PWM action to the lowside switches PWMEnableX When TRUE the PWM controller is enabled When FALSE default the PWM controller is disabled LSFaultCirX When TRUE clears the corresponding low side driver short circuit fault flag PWMPeriodX The time period between leading edges of low side switch closure PWMPeriod is entered in terms of 2 MHz clock ticks and is internally limited to 20 bits This provide a maximum period of 0 524 seconds or a frequency of 1 9 Hz and a resolution of 500 nsec Values larger than 20 bits will roll over from zero Drivven provides pfi lowside2ticks revf vi in the lowside function group in the RT function palette This VI can be implemented at the LabVIEW RT level for converting PWM frequency and duty cycle to PWMPeriod ticks and PWMPulseWidth ticks Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 21 Drivven Inc PFI Driver Module Kit PWMPeriod uint32 clock ticks 2 000 000 Frequency Hz PWMPulseWidthX The time during each PWMPeriod in which the low side switch is closed The low side switch is closed from the beginning of PWMPeriod until PWMPulseWidth expires PWMPulseWidth is entered in terms of 2 MHz clock ticks and is internally limited to 20 bits While PWMPulseWidth is
19. ndPosition depending on the VI used If this minimum spacing is not maintained then fuel commands will be generated with incorrect timing The units of CutoffPosition are CAT Drivven provides Offset2CAT vi in the General RT VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting CutoffPosition in CAD with respect to a cylinder TDC to CAT PeakTime Determines the length of time that the driver circuit will use peak current as the current control threshold PeakTime is entered as a uint8 value in terms of 2 MHz clock ticks divided by 64 Therefore the maximum value entered for PeakTime of 255 equates to an effective value of 16320 At 2 MHz this corresponds to a maximum delivered peak time of 8 16 msec Drivven provides pfi peaktime2ticks vi in the PFI Driver VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting PeakTime in milliseconds to FPGA clock ticks PeakTime uint8 ticks PeakTime msec 31 25 DurationX Determines the length of the fuel command delivered to the driver circuit Duration is entered in terms of 40 MHz clock ticks and is internally limited to 24 bits Values larger than 24 bits will roll over from zero Drivven provides time2ticks vi in the General RT VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting duration in milliseconds to FPGA clock ticks Duration uint32 clock ticks Duration
20. o action is taken because the fuel pulse has completed The new duration will take effect on the next pulse Modifications to StartPosition or EndPosition StartPosition and EndPosition can be modified at any time However the value must not be advanced by more than 45 CAD within a single engine cycle This value is referred to as the History Window The PFI VI continually checks the requested Start EndPosition with respect to the current crank position If the Start EndPosition is modified by the CPU to a position in the past the PFI VI uses the History Window to determine whether a late fuel pulse should be started 1 For example let s assume that a fuel pulse is scheduled for a StartPosition of 200 Absolute CAD ACAD Let s also assume that the CurrentPosition of the EPT VI is 190 ACAD when the CPU modifies StartPosition to 180 ACAD which is in the recent past by 10 CAD Since this is less than the 45 CAD History Window then the PFI VI will immediately start the fuel pulse even though it is late The pulse width will still be exactly according to Duration 2 As another example let s assume that a fuel pulse is scheduled for a StartPosition of 200 ACAD Let s also assume that the CurrentPosition of the EPT VI is 190 ACAD when the CPU modifies StartPosition to 120 ACAD which is in the far past by 80 CAD Since this is greater than the 45 CAD History Window the PFI VI will not generate a late pulse effectively skipping a cycle without a fuel
21. on the website for a recommended solution for protecting a system from reverse battery polarity Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 5 Drivven Inc PFI Driver Module Kit Platform Compatibility CompactRIO modules from Drivven are compatible within two different platforms from National Instruments One platform is CompactRIO consisting of a CompactRIO controller and CompactRIO chassis as shown in Figure 1a below Figure 1a CompactRIO platform compatible with Drivven CompactRIO modules The other platform is National Instruments PXI which consists of any National Instruments PXI chassis along with a PXI RT controller and PXI 78xxR R Series FPGA card An R Series expansion chassis must be connected to the PXI FPGA card via a SHC68 68 RDIO cable The CompactRIO modules insert into the R Series expansion chassis This platform is shown in Figure 1b below Fa FTL mi Figure 1b PXI platform compatible with Drivven CompactRIO modules Drivven CompactRIO modules are not compatible with the National Instruments CompactDAQ chassis Drivven CompactRIO modules REQUIRE one of the hardware support systems described above in order to function The modules may not be used by themselves and or interfaced to third party devices at the backplane HD15 connector These efforts cannot be supported by Drivven or National Instruments Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006
22. operating at 2 MHz This provides a resolution of 500 nsec and a minimum PWM frequency of 2 Hz Since 0 and 100 duty cycles are possible relays and actuators may be controlled in continuous on or off states Each low side driver channel automatically tests for open circuit conditions When the low side switch is commanded open the circuit is tested for an open condition Upon detection of an open circuit an open circuit error flag will be reported The error flag may be cleared by software Driver circuit operation is not affected by an open circuit error flag that is left asserted Each low side driver channel automatically protects itself from an accidental short circuit to battery When the low side switch is commanded closed the circuit is tested for a short Upon detection of a short a short circuit error flag will be reported for the channel and the channel will be disabled until software clears the error flag The short circuit error flag for each channel will not be cleared while the switch is being commanded closed It is strongly recommended that the user not continually clear the short circuit error flags as this may lead to driver circuit damage in the event of an actual short circuit Even though the short circuit detection and disable feature is present it is strongly recommended that the wiring harness include a 5A automotive fuse for four solenoids as shown in Figure 6 Driven Inc 2009 PFI Driver Module Kit User s Manual e
23. or Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 17 Drivven Inc PFI Driver Module Kit the next cycle CutoffFlag is also asserted and can be cleared by setting CutoffFlagClr to TRUE CutoffPosition must always be at least 45 crank angle degrees CAD after StartPosition or EndPosition depending on the VI used If this minimum spacing is not maintained then fuel commands will be generated with incorrect timing The units of CutoffPosition are CAT Drivven provides Offset2CAT vi in the General RT VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting CutoffPosition in CAD with respect to a cylinder TDC to CAT PeakTime Determines the length of time that the driver circuit will use peak current as the current control threshold PeakTime is entered as a uint8 value in terms of 2 MHz clock ticks divided by 64 Therefore the maximum value entered for PeakTime of 255 equates to an effective value of 16320 At 2 MHz this corresponds to a maximum delivered peak time of 8 16 msec Drivven provides pfi peaktime2ticks vi in the PFI Driver VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting PeakTime in milliseconds to FPGA clock ticks PeakTime uint8 ticks PeakTime msec 31 25 ISCH DurationX Determines the length of the fuel command delivered to the driver circuit Duration is entered in terms of 40 MHz clock ticks and
24. pulse The following cycle will have a pulse delivered starting at 120 ACAD CutoffPosition must be set with the following conditions in mind 1 CutoffPosition must be set to a position at least 45 CAD after StartPosition or EndPosition depending on the FPGA VI used If this minimum spacing is not maintained then fuel commands will be generated with incorrect timing Drivven Inc 2009 e PFI Driver Module Kit User s Manual D000006 Rev F 25 Drivven Inc PFI Driver Module Kit Warning About FPGA I O Node Wiring Great care should be taken to ensure that I O nodes are wired to the correct Pinlnput and PinOutput clusters of the correct module VI If wired incorrectly then undefined behavior or module damage could result LabVIEW FPGA does not yet provide a method for 3 party module vendors to hide the DIO pins behind module VIs and still be portable to various system configurations Therefore a double check of the I O node wiring is recommended Two LabVIEW FPGA code snippets are shown below from an ADCombo implementation which illustrate this issue Figure 4 shows the correct implementation of the FPGA I O node block for the PinOutput cluster of the ADCombo On the other hand figure 5 shows a coding mistake that should be avoided Notice the ADCombo output items where a Spark module output item is selected instead of the correct ADCombo module output item This means that the Spark DIO5 output is being driven by the ADCombo logic and w
25. r The Port Fuel Injection Driver Module Kit is provided with two different LabVIEW FPGA VIs Each VI includes an interface for controlling both PFI and low side drivers The VI having the ea designator supports end angle fuel pulse timing while the VI having the sa designator supports start angle timing End angle fuel pulse timing requires more FPGA resources therefore an optimization option is provided for the programmer Figure 7 shows the icon which represents both supplied VIs having identically named terminals However the contents of the PortFuelControl cluster is slightly different PortFuelControl XX PortFuelData LowSideControl EE TUIS DowSideData FuelSparkSupervisor zx PFTI SPinOutput put 1 Figure 7 PFI VI icon with leads The FPGA VI must be placed within a Single Cycle Loop SCL of a LabVIEW FPGA block diagram The SCL must execute at the default clock rate of 40 MHZ The FPGA VI requires a pre synthesized netlist file having a matching name and an extension of ngc The netlist file must be located in the same directory as the matching VI The installer will Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 13 Drivven Inc PFI Driver Module Kit place this file in the LabVIEW addons directory along with the FPGA VI Creating a LabVIEW Project Drivven recommends working from the provided example application as a starting point for learning the use of the Dri
26. r source or by an isolated power source If the cRIO controller is powered by the same battery and this battery is used for cranking the engine then it is possible that the battery voltage will drop below 9V during cranking causing the cRIO controller to reset This can be prevented by using a small backup battery and a diode pack for the cRIO controller Please contact Drivven for recommended parts and connections Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 10 Drivven Inc PFI Driver Module Kit Low Side Drivers The low side drivers are capable of driving a wide variety of automotive relays and actuators Examples of actuators include EGR valves turbo wastegate valves fuel pressure regulators or any single solenoid actuator which draws less than 1 2 amps at the highest expected battery voltage WARNING Do not attempt to drive low impedance injectors or solenoids with the general purpose low side drivers The low side drivers are only rated for 1 2 amps continuous Higher current levels could damage the low side drivers Each channel is independently controlled within the module via pulse width modulation PWM PWM duty cycle from 0 to 100 is possible Software on the RIO FPGA device communicates several parameters for each channel to operate Those parameters are Enable Period and PulseWidth All parameters are communicated serially at 200 usec intervals Each PWM controller utilizes a 20 bit timer
27. s which introduce added resistance or total injection duration which is less than the requested peak time such that the peak current is never reached Each PFI driver channel automatically protects itself from an accidental short circuit to battery At the beginning of each injection event the current rise rate is monitored in order to detect a short circuit If the current rises faster than expected for a typical port fuel injector solenoid then a short circuit error flag will be reported for that channel and the channel will be disabled until software clears the error flag Short circuit detection is also performed continuously at a later time within each injection event The short circuit error flag for each channel will not be cleared while an injection event is being commanded for that channel It is strongly recommended that the user not continually clear the short circuit error flags as this may lead to driver circuit damage in the event of an actual short circuit Even though the short circuit detection and disable feature is present it is strongly recommended that the wiring harness include a 5A automotive fuse for four low impedance injectors as shown in Figure 5 Figure 2 is a representation of a typical peak hold current trace if one of the injector leads were monitored with a current probe and oscilloscope Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 7 Drivven Inc PFI Driver Module Kit Typical P
28. t and navigate to New Targets and Devices 8 Within the Add Targets and Devices dialog select the appropriate radio button depending on whether you already have an existing FPGA target connected to an existing RT target or if you are adding a new FPGA target which is not present yet a Existing Target or Device i Expand the appropriate category in the Targets and Devices list to see the discovered FPGA targets in that category ii Double click the desired target to add it to your project b New Target or Device i Expand the appropriate category in the Targets and Devices list to see all possible targets within that category ii Double click the desired target to add it to your project If the new FPGA target was not currently in the system right click on the FPGA target within the project and open the properties dialog to set the resource name if necessary The resource name can be found from MAX when connected to the actual remote system 10 If the FPGA target is a PXI or PCI card then an R Series expansion chassis must be added under the FPGA target This is done by right clicking on the FPGA target and navigating to New gt R Series Expansion Chassis Within the following dialog select the appropriate FPGA connector to which the chassis will be connected A unique name for the chassis may also be specified 11 Right click on the R Series expansion chassis or cRIO FPGA target chassis and navigate to New
29. t to TRUE when an open circuit is detected for the port fuel injector The flag is cleared when the condition is removed TF PFlFaultShortX Set to TRUE when a short circuit is detected for the port fuel injector A short circuit automatically disables the channel until the flag is cleared by the corresponding PFIFaultClr ModulePresent Set to TRUE when Drivven software properly detects the module is powered and present in the expected slot LowSideData Cluster of Boolean flags indicating open circuits and short circuits rri LSFaultOpenX Set to TRUE when an open circuit is detected for the low side driver The flag is cleared when the condition is removed LSFaultShortX Set to TRUE when a short circuit is detected for the low side driver A short circuit automatically disables the channel until the flag is cleared by the corresponding LSFaultClr PFILSPinOutput The boolean indicator named IDSelectEn must be connected to a Set Output Enable method of an FPGA I O Method Node The boolean indicator named IDSelectOut must be connected to a Set Output Data method of an FPGA I O Method Node The remaining boolean indicators must be connected to their corresponding FPGA I O Node output item Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 19 Drivven Inc PFI Driver Module Kit pfi_vt_ea_revf vi This VI is for interfacing directly with the Drivven PFI Driver module and for providing a control interface to the Lab
30. t32 clock ticks 2 000 000 Frequency Hz PWMPulseWidthX The time during each PWMPeriod in which the low side switch is closed The low side switch is closed from the beginning of PWMPeriod until PWMPulseWidth expires PWMPulseWidth is entered in terms of 2 MHz clock ticks and is internally limited to 20 bits While PWMPulseWidth is 0 the low side switch will remain open While PWMPulseWidth is greater than or equal to PWMPeriod the low side switch will remain closed Values larger than 20 bits will roll over from zero Drivven provides pfi lowside2ticks revf vi in the lowside function group in the RT function palette This VI can be implemented at the LabVIEW RT level for converting PWM frequency and duty cycle to PWMPeriod ticks and PWMPulseWidth ticks PWMPulseWidth uint32 clock ticks DutyCycle 20 000 Frequency Hz FuelSparkSupervisor This cluster input must be wired directly from the FuelSparkSupervisor cluster output of a Drivven EPT VI PFILSPinlnput These boolean controls must be connected to their corresponding FPGA I O Node input item PortFuelData Cluster of Boolean flags indicating cutoff flags open circuits short circuits and module present CutoffFlagX Set to TRUE when CurrentPosition from the EPT VI equals CutoffPosition CutoffFlag can be used by the CPU as interrupt flags if necessary to perform calculations synchronous with crank position CutoffFlag is cleared by setting CutoffFlagClr TRUE PFlFaultOpenX Se
31. ulse via this method StartNowX See FuelMode CutoffFlagCIrX When TRUE the CutoffFlag within the PortFuelData cluster is cleared E EndPositionX This control will be available when using the pfi vt ea revx vi Fuel pulses are generated with a trailing edge coinciding with EndPosition The length of the pulse will be according to Duration The leading edge will be determined by the requested Duration When EndPosition is used Duration will always take precedence over EndPosition in the presence of engine speed fluctuations If the engine speed increases after the fuel pulse has started then the trailing edge will occur after EndPosition in order to ensure that Duration is achieved Likewise if the engine speed decreases after the fuel pulse has started then the trailing edge will occur before EndPosition The units of EndPosition are CAT Drivven provides Offset2CAT vi in the General RT VIs in the RT function palette This VI can be implemented at the LabVIEW RT level for converting EndPosition in CAD with respect to a cylinder TDC to CAT Drivven Inc 2009 e PFI Driver Module Kit User s Manual e D000006 Rev F 20 Drivven Inc PFI Driver Module Kit CutoffPositionX All fuel pulse activity is Cutoff at CutoffPosition and reset for the next cycle CutoffFlag is also asserted and can be cleared by setting CutoffFlagClr to TRUE CutoffPosition must always be at least 45 crank angle degrees CAD after StartPosition or E
32. vven software blocks However the following section describes starting a LabVIEW project from scratch and adding a Drivven module 1 Install the Drivven software by running the installer executable and accepting the software license agreement Restart LabVIEW if previously running and create a new LabVIEW project Give the new project a name by clicking the Save Project button on the project toolbar Right click on the highest item in the project hierarchy Project and navigate to New gt Targets and Devices 5 Within the Add Targets and Devices dialog select the appropriate radio button depending on whether you already have an existing powered and configured RT target on the network or if you are adding a new RT target which is not present yet on the network a Existing Target or Device i Expand the appropriate category in the Targets and Devices list to see the discovered targets in that category ii Double click the desired target to add it to your project b New Target or Device i Expand the appropriate category in the Targets and Devices list to see all possible targets within that category ii Double click the desired target to add it to your project 6 If the new RT target is not currently on the network right click on the RT target within the project and open the properties dialog to set the IP address or DNS name if necessary 7 Right click on the RT target within the projec
33. ysical teeth per crankshaft rotation For example if using the N M EPT VI which has an extrapolation of 7 the number of CAT per crank tooth would be 2 72128 and CurrentPosition would be evenly incremented by 128 CAT from one physical tooth to the next If a 60 2 pattern were used the maximum number of CAT per crankshaft rotation cycle would be 60 128 27680 If the engine was a 4 stroke the total number of CAT per engine cycle would be 2 60 128 15360 MAX CAT Maximum Crank Angle Ticks per engine cycle Drivven Inc 2009 PFI Driver Module Kit User s Manual e D000006 Rev F 16 Drivven Inc PFI Driver Module Kit Sub VI Documentation pfi vt sa revf vi This VI is for interfacing directly with the Drivven PFI Driver module and for providing a control interface to the LabVIEW RT level The FPGA VI must be placed within a Single Cycle Loop SCL of a LabVIEW FPGA block diagram The SCL must execute at the default clock rate of 40 MHz The FPGA VI requires a pre synthesized netlist file having a matching name and an extension of ngc The netlist file must be located in the same directory as the matching VI The installer will place this file in the LabVIEW addons directory along with the FPGA VI The Pinlnput and PinOutput clusters are wired to LabVIEW FPGA I O nodes which are configured for a cRIO controller chassis or a cRIO R Series expansion chassis Refer to the LabVIEW FPGA documentation for details about creating and configur
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