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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8767 Platform to Powertrain Electrical Interface (PPEI) Specification Starter Control Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North American Eng
2、ineering Standards Page 1 of 32 1 Introduction 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Information, On-Board Diagnostics and Electrical Requirements and GMLAN Serial Data Signal Definitions and Framing for the followi
3、ng nineteen PPEI subsystems standard specifications: 1. GMW8763 Power and Ground 2. GMW8764 Four Wheel Drive/All Wheel Drive Controls 3. GMW8765 Displays and Gauges 4. GMW8766 Engine Power Management 5. GMW8767 Starter Control 6. GMW8768 Vehicle Theft Deterrent 7. GMW8769 Cruise Control 8. GMW8770 C
4、ooling Fan Control 9. GMW8771 Air Conditioning Compressor Control 10. GMW8772 Serial Data Architecture 11. GMW8773 Brakes and Traction Control 12. GMW8774 Enhanced Evaporative Emissions and Fuel 13. GMW8775 Exhaust After-Treatment 14. GMW8776 Suspension Control 15. GMW8777 Transmission Control 16. G
5、MW8778 Generator Control 17. GMW8779 Post Collision Operation 18. GMW8780 Power Take-Off and Fast Idle Control 19. GMW8781 Vehicle Speed and Rough Road Sensing Each of the nineteen PPEI subsystem standard specifications contains the hardware, serial data, algorithms and calibrations for the named su
6、bsystem. The master PPEI document and all nineteen PPEI subsystem standard specifications are required to define the complete set of PPEI requirements. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None. 2.2 GM
7、 Standards/Specifications. GMW3001 GMW8772 GMW3059 GMW8773 GMW8762 GMW8774 GMW8763 GMW8775 GMW8764 GMW8776 GMW8765 GMW8777 GMW8766 GMW8778 GMW8768 GMW8779 GMW8769 GMW8780 GMW8770 GMW8781 GMW8771 2.3 Additional References. None. 3 Subsystem Requirements 3.1 Functional Overview. The ECM Controlled Sta
8、rt mechanization defined in this section shall be applicable to vehicles equipped with an ignition key switch or push button start (Easy Key). The mechanization supports Power Take Off (PTO) remote start on automatic and manual transmissions and the Remote Vehicle Start (RVS) feature on automatic tr
9、ansmission vehicles only. Starter Control requirements are captured in the PPEI Starter Control algorithm description in Section 4.1. For information about Easy Key, refer to the Easy Key Subsystem Technical Specification. For information about RVS, refer to the RVS Subsystem Technical Specification
10、. For information about PTO Remote Engine Start, refer GMW8767 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 32 March 2006 to the Power Take Off Remote Engine Start Subsystem Technical Specification. The ECM Controlled Start mechanization
11、utilizes a serial data based power mode signal for a driver- initiated crank request. The ECM shall only initiate engine cranking when the value of this signal is CRANK_REQUEST, after previously receiving an indication that the vehicle is in Park/Neutral or that the clutch is determined to be depres
12、sed. Clutch status is only used in vehicles with a calibration requiring clutch depression for crank initiation. Upon loss of serial data from the Power Mode Master and the Backup Power Mode Master, the ECM shall use its discrete Run/Crank Relay Output (an input to the ECM) and Accessory Input signa
13、ls for power moding. In this case, the ECM is unable to receive the CRANK REQUEST power mode signal and shall not use its discrete inputs to initiate engine cranking. The only exception to this criterion is as follows: EXCEPTION: The ECM can initiate engine cranking based on its discrete input signa
14、ls ONLY when the ECM is in “Post Release Stall” mode operation. The Post Release Stall mode operation requires the following: the ECM has passed Vehicle Theft during the current ignition cycle, the engine has stopped rotating and there is a loss of System Power Mode and System Backup Power Mode sign
15、als over serial data. Only the Ignition Mode Switch can generate the Backup System Power Mode = “Crank Request” on the High Speed GMLAN bus. The conventional Ignition Switch system will not provide System Backup Power Mode signals to the high speed bus since the Backup Power Mode Master is only enab
16、led upon the loss of low speed communication with the gateway module. The ECM shall disable engine cranking based on its discrete Run/Crank Relay Output and Accessory input signals, or when the value of the power mode signal is not equal to CRANK REQUEST. The Power Mode Master will never issue the C
17、rank Request power mode signal when in the Off, Accessory/Wake Up, or Run ignition switch positions during any single point failure of the ignition key switch or Easy Key wires. 3.2 Hardware Overview. The Accessory/Wake Up and Run/Crank signals are required for starter control and shall be used for
18、detecting wake-up. On manual transmissions, Clutch Start information (when required) is communicated to the Powertrain electronics from the Platform. This information is provided by a discrete switch or a sensor. On automatic transmissions, powertrain shall determine park or neutral gear selection w
19、ith a discrete switch to the ECM. Vehicle theft password and status, and system power mode are communicated using the serial data link. The starter solenoid is energized from the battery via the starter control relay. The starter control relay is controlled by the Starter Control output of the power
20、train electronics. -,-,- GM WORLDWIDE ENGINEERING STANDARDSGMW8767 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 3 of 32 3.2.1 Block Diagram. The following block diagram (Figure 1) depicts the standard mechanization for ECM Controlled Start. Figure 1: Starter Control
21、Subsystem Block Diagram POWERTRAIN PLATFORM Note: 1. Clutch Start Switch is required for North American and optional for European manual transmissions only. Alternatively, a Clutch Pedal Position (CPP) Sensor may provide this information, Reference GMW8777 Transmission Control for more detail on the
22、 CPP Sensor requirements. Engine Block Ground BATTERY + - Starter Battery Feed (Unfused Power Line) Starter Motor Starter Solenoid PLATFORM ELECTRONICS Serial Data Link Internal Mode Switches 4 Lines PRNDL Clutch Start Switch (Platform Released) or Neutral Start Switch (Powertrain Released) 1 N/O Cl
23、utch Start/Neutral Start Power Mode Master Run/Crank Relay Output Accessory/Wakeup ECM TCM PTO Remote Engine Shutdown CPP Sensor 1k 3k 5Vref Clutch Pedal Position Sensor Sensor Return Switched Battery Starter Control Starter Solenoid Battery Starter Control Relay N/O -,-,- GMW8767 GM WORLDWIDE ENGIN
24、EERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 4 of 32 March 2006 3.2.2 Power and Ground Requirements. The cranking circuit power and ground requirements shall be mutually resolved between Platform and Powertrain for each application. For GMNA applications, refer
25、 to the “Cranking Subsystem Technical Specification”. 3.3 Interface Description. 3.3.1 Serial Data Link. Reference GMW8762 Section 4 PPEI GMLAN Serial Data Signal and Definitions and Framing for definitions of signals listed in Table 1. 3.3.2 Calibrations. The following Table 2 contains calibrations
26、 that cross the Platform Powertrain Electrical Interface (i.e., are located in devices on one side of the interface but controlled by the other side of the interface or driven by variation in the other side of the interface). Refer to Section 4.1 PPEI Starter Control Algorithm and Section 4.2 PPEI R
27、emote Vehicle Start Monitor Algorithm for details. Table 1: Starter Control Serial Data Signals Signal Name Transmitter Notes Backup Power Mode Master Virtual Device Availability Platform Required Engine Run Active Powertrain Required Platform Engine Speed Command On Switch Active Platform Required
28、with PTO Power Take Off Enable Switch Active Platform Required with PTO Power Take Off Powertrain Run Aborted Platform Required with PTO Power Take Off Remote Engine Shutdown Requested Platform Required with PTO Power Take Off Remote Start Master Engine Start Request Platform Required with PTO Power
29、 Take Off Remote Start Master Engine Shutdown Request Platform Required with PTO Powertrain Crank Aborted Powertrain Required Powertrain Crank Active Powertrain Required Powertrain Run Aborted Powertrain Required Remote Vehicle Start Engine Running Powertrain Required with RVS Remote Vehicle Start R
30、equest Platform Required with RVS Starting Disabled Indication On Powertrain Required System Backup Power Mode Platform Required System Backup Power Mode Enabled Platform Required System Power Mode Platform Required Wheel Rotational Status Left Driven Platform Required With ABS Wheel Rotational Stat
31、us Left Non Driven Platform Required With ABS Wheel Rotational Status Right Driven Platform Required With ABS Wheel Rotational Status Right Non Driven Platform Required With ABS Table 2: Starter Control Calibrations Calibration Name Location Owner K_AccelPedalPct ECM Platform K_AccelPedalPctTime ECM
32、 Platform K_ClutchStarterInterlockPresent ECM Platform K_CrankExtend ECM Platform/Powertrain K_CrankExtendFuelLvl ECM Platform K_CrankReqCrankExtendEnblTime ECM Platform K_EngSpdThresh_1 ECM Platform K_EngSpdThresh_1_Tme ECM Platform K_EngSpdThresh_2 ECM Platform K_EngSpdThresh_2_Tme ECM Platform K_
33、FuelPumpDelay ECM Platform K_LowVoltageCrankExtendThrsh ECM Platform K_LowVoltageCrankExtendTime ECM Platform GM WORLDWIDE ENGINEERING STANDARDSGMW8767 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 5 of 32 K_Max_Starts_Allowed ECM Platform K_MaxCrank ECM Platform K_Mi
34、nCrank ECM Platform K_PTO_EngShutDwnEnbl ECM Platform K_PwrModeDelay ECM Platform K_RVSPCMBackupTimerFirstStart ECM Platform K_RVSPCMBackupTimerSecondStart ECM Platform K_ShortHighEngRunTime ECM Powertrain/Platform Table 3: Clutch Start/Neutral Start Electrical Characteristics Maximum Contact Voltag
35、e Drop 250 mV DC Minimum Open Circuit Resistance 50 Kohm Maximum Contact Chatter Time 7.2 msec Active State Closed to ground when clutch is fully disengaged (pedal is depressed) 3.3.3 Clutch Start/Neutral Start. For automatic transmissions, a normally open Neutral Start switch is required. This inpu
36、t to the powertrain electronics is connected to ground when the Neutral Start switch is closed. For manual transmission equipped vehicles, Clutch Pedal Apply- Bottom-of-Travel State information is required. See section 3.3.11. 3.3.4 Starter Control. This signal is a discrete high-side driver output
37、of the Powertrain electronics intended to drive a starter control relay. The starter relay coil shall be connected to ground. The Powertrain electronics shall drive the output high for engagement of the starter relay. 3.3.5 Starter Solenoid. This input to the starter motor is a power feed from the s
38、tarter control relay that energizes the starter solenoid. The starter control relay is sourced by battery voltage and is driven by the starter control output of the Powertrain electronics. 3.3.6 Starter Battery Feed. The Platform shall provide an unfused Battery cable directly to the starter motor.
39、3.3.7 Engine Block Ground. Reference GMW8763 Section 3.3.7 PPEI Power and Ground Subsystem. 3.3.8 Accessory/Wake Up. Reference GMW8763 Section 3.3.2 PPEI Power and Ground Subsystem. 3.3.9 Run/Crank Relay Output. Reference GMW8763 Section 3.3.3 PPEI Power and Ground Subsystem. 3.3.10 Power Take Off R
40、emote Engine Shutdown. Reference GMW8780 Section 3 PPEI Power Take Off and Fast Idle Control Subsystem. 3.3.11 Clutch Pedal Apply Bottom-of-Travel State. The Bottom-of-Travel State is used to determine if the clutch is disengaged. The engine start subsystem requires the clutch be fully disengaged pr
41、ior to allowing engine cranking. Therefore, the bottom-of-travel state must not be true until the clutch pedal is deep enough in the pedal travel to ensure disengagement of the clutch. This bottom- of-travel state detection is optional for certain European applications. Two methods exist to detect c
42、lutch pedal apply. One method uses discrete switches. The switches are located at specific positions relative to pedal travel. One of these switches provides an indication of the bottom-of-travel state. The other method uses an analog sensor (Clutch Pedal Position Sensor) to detect the pedal positio
43、n. This position can then be compared to predefined thresholds to provide information similar to that provided by the discrete switches. 3.3.11.1 Clutch Start Switch This is a normally-open switch that is connected to ground. This switch provides an indication of whether the clutch is fully disengag
44、ed. 3.3.11.2 Clutch Pedal Position Sensor A potentiometer provides an indication of the clutch pedal position. The ECM uses this input to determine the current pedal position relative to the total range of pedal travel available on a vehicle. The current position can be used along with a specified t
45、hreshold to provide a positional state similar to Bottom-of-Travel (Clutch Start) switch. 3.4 Failure Modes and Diagnostics. -,-,- GMW8767 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 6 of 32 March 2006 Reference GMW8772 Section 3.4 PPEI Seria
46、l Data Architecture Requirements for serial data failure modes and diagnostic information. Powertrain shall diagnose the Clutch/Neutral discrete input. If a failure is detected, Powertrain shall store a code and utilize serial data gear state information (if available) for subsequent vehicle starts.
47、 Powertrain shall diagnose the starter relay control signal and store a code if a failure is detected. 3.5 Electrical Characteristics. 3.5.1 Clutch Start/Neutral Start. This input to the ECM shall have the characteristics of the switched-low discrete input described in Section 3.4. This input shall
48、be pulled up to a switched battery source active in the RUN and CRANK REQUEST power modes. 3.5.1.1 Clutch Start Switch. The (platform released) Clutch Start Switch shall be compatible with the characteristics of the switched-low discrete input as described in GMW8762 Section 3.4 PPEI Electrical Requ
49、irements. In addition, the Clutch Start Switch shall have the electrical characteristics defined in Table 3. 3.5.2 Clutch Pedal Position Sensor Reference GMW8777 Section 3.5.2.2 CPPS Electrical Requirements. 3.5.2.1 5Vref Reference GMW8777 Section 3.5.2.2.1.1. 3.5.2.2 Sensor Return Reference GMW8777 Section 3.5.2.2.1.2. 3.5.2.3 CPP Sensor Reference GMW8777 Section 3.5.2.2.1.3. 3.5.3 Starter Control. The output of the Powertr