NI 9758 (PFI Driver) User Manual
Contents
1. Powertrain Control modules are not compatible with the National Instruments CompactDAQ chassis You can use NI Powertrain Control modules with NI cRIO 91 1x NI cRIO 907x and NI R Series Expansion systems under the following conditions Leave one empty chassis slot between NI Powertrain Control modules and other NI modules e Maintain an ambient system operating temperature of 0 C to 45 C Note Typical specifications of National Instruments modules might not apply when used in a system with NI Powertrain Control modules Note National Instruments guarantees warranted specifications for all National Instruments modules except thermocouple modules when used in a system with NI Powertrain Control modules Note National Instruments recommends the NI 9214 for thermocouple measurements in CompactRIO systems using NI Powertrain Control modules Note NI Powertrain Control modules do not support Scan Interface mode auto detection or ID mode 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 Q resistance across the solenoid which allows a higher current through the solenoid to enable faster valve opening times 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 the2. below 9 V during cranking causing the CompactRIO controller to reset This can be prevented by using a small backup battery and a diode pack for the CompactRIO controller E NN PFI Module Connector 8 nicom NI 9758 User Manual Compliance and Certifications Safety This product meets the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use IEC 61010 1 EN 61010 1 e UL 61010 1 CSA 61010 1 Electromagnetic Compatibility This product meets the requirements of the following EMC standards for electrical equipment for measurement control and laboratory use EN 61326 1 IEC 61326 1 Class A emissions Industrial immunity e EN 55011 CISPR 11 Group 1 Class A emissions AS NZS CISPR 11 Group 1 Class A emissions e FCC 47 CFR Part 15B Class A emissions e CES 001 Class A emissions A Caution When operating this product use shielded cables and accessories CE Compliance C This product meets the essential requirements of applicable European Directives as follows 2006 95 EC Low Voltage Directive safety e 2004 108 EC Electromagnetic Compatibility Directive EMC NI 9758 Manual National Instruments 9 Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner NI recognizes that eliminating certain hazardous substances from our products is beneficial
3. hold current level of 1 A 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 detected 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 5 A automotive fuse for four high impedance injectors Figure 3 Hold Current Reached and Controlled i 2 E E 3 o 1 Valve Opening Time Figure 4 Hold Current Never Reached i 2 E E 3 o9 1 Valve Opening Tme A Caution 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 A continuous The resulting higher current levels could damage the low side drivers 6 nicom NI 9758 User Manual Figure 5 Connecting Port Fuel Injectors to the Driver Module Battery or Power Supply 12V Typical E REN N PFI Module Connector Note A CompactRIO controller may be powered by the same power source or by an isolated power source If the Compact RIO controller is powered by the same battery used for cranking the engine then it is possible that the battery voltage will drop below 9 V during cranking causing the CompactRIO controller to reset This can be prevented by using a small backup battery and a diode pack for the CompactRI
4. Instruments for repair NI 9758 Manual National Instruments 11 Refer to the M Trademarks and Logo Guidelines at ni com trademarks for more information on National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patents Notice at ni com patents You can find information about end user license agreements EULAs and third party legal notices in the readme file for your NI product Refer to the Export Compliance Information at ni com 1egal export compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes ECCNs and other import export data 2013 National Instruments All rights reserved 376107A 01 Sep13
5. O controller Visit ni com info and enter Info Code PFI for recommended parts and connections for the NI 9758 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 A atthe highest expected battery voltage A Caution 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 A 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 us intervals Each PWM controller utilizes a 20 bit timer operating at 2 MHz This provides a resolution of 500 ns 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 NI 9758 Manual National Instruments 7 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 detectio
6. USER MANUAL NI 9758 NI Powertrain Controls Port Fuel Injector Driver Module Contents Introduction Pinout FATA Wate Powering th Module 25 Ihi ence cedseasecsedesavock ecd MR Platform Compatibility Port Fuel Injector Drivers Low Side Drivers Compliance and Certifications esses ener nennen 9 Physical Specifications and Characteristics sese 11 b f NATIONAL P INSTRUMENTS Introduction The National Instruments 9758 Port Fuel Injector PFI Driver Module includes a CompactRIO cRIO module for driving low and high impedance Port Fuel Injectors PFI and general purpose automotive solenoid valves and actuators The NI 9758 includes a LabVIEW FPGA VI for controlling each driver channel Each PFI channel is individually controlled for timing and duration Each general purpose low side solenoid driver is PWM controlled capable of 0 to 100 duty cycle operation Features 4 channel low or high impedance PFI driver Two phase current control Turnable current level and duration for each phase Optional recirculation at end of pulse Open and short circuit detection and reporting with short circuit disable 4 channel general purpose low side solenoid driver 1 5 A continuous duty PWM controlled e 096 to 100 duty cycle operation e 2 Hzto 10 kHz frequency
7. 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 A and a hold current of 1 A 4 nicom NI9758 User Manual The NI 9758 has two phases of current control The maximum phase current is 4 A Control can be set to transition from the first to the second phase after a set time or immediately when the first current level is reached To drive low impedance injectors set the first phase peak current to 4 A and the second phase hold current to 1 A 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 include very low battery voltage poor connections which introduce added resistance or total injection duration which is less than the requested peak time and the peak current is never reached Each PFI driver channel is protected from 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 fla
8. d injectors are connected to and powered from the same power supply as the NI 9758 a battery or power supply capable of 10 A continuous output will be required under a full load The NI 9758 requires both external power and power from the CompactRIO backplane The high current path is directed through the BATT and GND terminals on the front of the NI 9758 not through the HD15 backplane connector c Note The NI 9758 will not be recognized by software without both power supplies active gt Caution The external battery supply input terminals are not reverse voltage polarity protected Connecting power to the NI 9758 in reverse polarity will damage the NI 9758 This event is not covered by the warranty NI 9758 Manual National Instruments 3 Platform Compatibility NI Powertrain Control modules require a hardware support system to function You cannot use the modules independently or interfaced with third party devices at the backplane HD15 connector NI Powertrain Control modules are compatible with the following National Instruments platforms CompactRIO which consists of a CompactRIO controller chassis or integrated controller chassis NI PXI which consists of any NI PXI chassis NI PXI RT controller and NI PXI 78xxR R Series FPGA card The NI Powertrain Control modules insert into an NI R Series expansion chassis Connect an NI R Series expansion chassis to the NI PXI FPGA card using a SHC68 68 RDIO cable Note NI
9. e Install a clamp on ferrite bead onto both the power supply cable and the signal cable Power to the module must be off when adding ferrites Ferrites must be connected to the power cable and the signal cable as close to the module as possible Placing the ferrite elsewhere on the cable noticeably impairs its effectiveness Determine the clamp on ferrite beads to install based on your application Use the following ferrites or other similar ferrites Power cable Laird 28A0592 0A2 Signal cable TDK Cat3035 2 total 10 nicom NI9758 User Manual Physical Specifications and Characteristics Weight d edere landed 145g Screw terminal wiring sse 1 02 mm in diameter 18 AWG or larger Maximum Altitude ssss 2000 m Operating Temperature see 40 C to 70 C Maximum Ambient Temperature 60 C Operating Humidity sees 10 to 90 RH noncondensing Pollution Degree 2 Ingress Protection sss IP30 For indoor use only If you need to clean the module wipe it with a dry towel Safety Guidelines A Caution Do not operate the NI 9758 PFI Driver in a manner not specified in these operating instructions Product misuse can result in a hazard You can compromise the safety protection built into the product if the product is damaged in any way If the product is damaged return it to National
10. g 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 5 A automotive fuse for four low impedance injectors as shown below 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 Figure 2 Peak Hold Current Profile 4 Typical Peak Time 1 2 msec 4 Currant Ampa Tme NI 9758 Manual National Instruments 5 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 Q resistance across the solenoid Typically less than 1 A is required to open and hold the solenoid valve High impedance injectors require a single current phase Set the duration of the first phase to zero to keep control of the phase during the injection event The open circuit flag should be ignored when driving high impedance injectors because the
11. n 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 ofa 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 5 A automotive fuse for four solenoids Figure 6 Connecting General Purpose Solenoids to the Low Side Driver Channels Battery or Power Supply 12V Typical Relay or Actuator Relay or Actuator Relay or Actuator Relay or Actuator Note A CompactRIO controller may be powered by the same power source or by an isolated power source If the CompactRIO controller is powered by the same battery used for cranking the engine then it is possible that the battery voltage will drop
12. operation 500 ns resolution Open and short circuit detection and reporting with short circuit disable External power supply of 7 V to 32 V Pinout Figure 1 NI 9758 Pin Assignments BATT LS L52 LS3 PFI PFI2 PFI3 PFI4 GND 2 nicom NI 9758 User Manual Hardware The NI 9758 provides four port fuel injector drivers and four general purpose low side solenoid drivers in a NI CompactRIO module Powering the Module The NI 9758 requires power from two different sources a 15 pin D SUB HD15 connector and the external screw terminal connector The CompactRIO backplane male high density D SUB 15 pin HD15 connector mates with the module s female HD15 connector This power source provides a regulated 5 V and ground to various digital logic functions within the module The CompactRIO 5 V source is active whenever the CompactRIO or R Series Expansion Chassis is properly powered The NI 9758 should only be powered at the HD15 connector by plugging it into a CompactRIO or R Series Expansion Chassis The NI9758 HD15 connector should not be connected to any other device The external screw terminal connector with the terminals labeled BATT 0 and GND 9 provide a second power source Typical power sources will be from automotive 12 V or 24 V battery systems The NI 9758 can accept power from 7 V to 32 V The NI 9758 requires a maximum of 100 mA from an external power supply When actuators an
13. to the environment and to NI customers For additional environmental information refer to the Minimize Our Environmental Impact web page at ni com environment This page contains the environmental regulations and directives with which NI complies as well as other environmental information not included in this document Waste Electrical and Electronic Equipment WEEE K EU Customers At the end of the product life cycle all products must be sent to faa a WEEE recycling center For more information about WEEE recycling centers National Instruments WEEE initiatives and compliance with WEEE Directive 2002 96 EC on Waste and Electronic Equipment visit ni com environment weee Battery Replacement and Disposal Battery Directive Battery Directive This device contains a long life coin cell battery If you need to replace it use the Return Material Authorization RMA process or contact an authorized National Instruments service representative For more information about compliance with the EU Battery Directive 2006 66 EC about Batteries and Accumulators and Waste Batteries and Accumulators visit ni com environment batterydirective Ca he Pb BT Re mis REHE ChE ROHS GG RAZA National Instruments 4 P Ed rf fas d BR TU ERE REA EL RR RoHS XT National Instruments FE RoHS AREA WK ni com environment rohs china For information about China RoHS compliance go to ni com environment rohs china Ferrite Requirement for EMC Complianc
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