GMW-8777-2006.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8777 Platform to Powertrain Electrical Interface (PPEI) Specification Transmission Control Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North America
2、n Engineering Standards Page 1 of 39 1 Introduction This standard defines the Transmission electrical interface between Platform and Powertrain. 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Information, On-Board Diagnostic
3、s and Electrical Requirements and GMLAN Serial Data Signal Definitions and Framing for the following 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.
4、 GMW8767 Starter Control 6. GMW8768 Vehicle Theft Deterrent 7. GMW8769 Cruise Control 8. GMW8770 Cooling 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. GMW
5、8775 Exhaust After-Treatment 14. GMW8776 Suspension Control 15. GMW8777 Transmission 16. GMW8778 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 speci
6、fications contains the hardware, serial data, algorithms and calibrations for the named subsystem. 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
7、applicable unless otherwise specified. 2.1 External Standards/Specifications. None. 2.2 GM Standards/Specifications. GMW3001 GMW8771 GMW3059 GMW8772 GMW8762 GMW8773 GMW8763 GMW8774 GMW8764 GMW8775 GMW8765 GMW8776 GMW8766 GMW8778 GMW8767 GMW8779 GMW8768 GMW8780 GMW8769 GMW8781 GMW8770 2.3 Additional
8、References. GMPT CPPS (Clutch Pedal Position Sensing) Subsystem Technical Specification (SSTS) Revision 3. 3 Subsystem Requirements 3.1 Functional Overview. This interface shall be applicable to all vehicles equipped with manual or automatic transmissions. Powertrain shall define the functional requ
9、irements of the transmission control system for each application. Powertrain shall determine selected gear state and shift preference state (optional) for use in transmission shift control. Shift Control: Shift Control is comprised of Driver Shift Control and Electronic Range Select. GMW8777 GM WORL
10、DWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 39 March 2006 Driver Shift Control (DSC) is an optional function, which allows an automatic transmission to be operated like a manual transmission. Platform is required to have a DSC display for the d
11、river in order to have the DSC feature. Electronic Range Select (ERS) is an optional function similar to DSC except that the ERS feature allows for the selection of ranges instead of discrete gears as with DSC. It uses the DSC switches to electronically shift the range of an automatic transmission.
12、The customer must first enable the system by moving the transmission shift lever. There are two configurations to enable DSC or ERS. 1. Gated Shifter. This transmission shifter has a DSC/ERS On/Off switch that is enabled by the driver when the shifter is moved to the “gate” position. Based upon a pl
13、atform calibration, the transmission may immediately go into DSC (or ERS) or wait until the driver activates the tap up or tap down switch. 2. Inline Shifter. This transmission shifter does not require a DSC/ERS On/Off switch if used with an IMS transmission. DSC or ERS is enabled based upon shift l
14、ever position. Typically, the driver will move the shifter from Drive to a lower gear. Based upon a platform calibration, Powertrain will enable the DSC (or ERS) based upon shift lever position and DSC/ERS On/Off switch if equipped. On non-IMS applications an DSC/ERS On/Off switch is required when m
15、oving the shifter to a lower gear. Once enabled Powertrain sends a confirmation to Platform that DSC or ERS mode is active. Powertrain will maintain the transmission in the current gear or range unless transmission protection or engine stall calibrations are reached. The driver makes gear or range c
16、hange requests with the Tap-Up or Tap-Down switches in single gear or range increments. For DSC applications, the display will indicate transmission gear data from Powertrain when the DSC active signal is received. For ERS applications, the display will indicate the range selected. Not all automatic
17、 transmissions have the capability for DSC or ERS. To exit the DSC and ERS mode, the driver moves the shifter to the Drive position. Transmission Shift Preference Switches: The transmission shift pattern selection is based on driver preferences. Examples of driver preference may be (but are not limi
18、ted to): Normal, Winter, Sport, Tow Haul. Winter Mode can be a request to start in second gear, or a distinct shift pattern. The driver can select a shift pattern by activating a momentary contact switch. Platform electronics shall read switch and transmit a serial data signal to the TCM indicating
19、the state of the switch pressed. A platform calibration shall determine which switch corresponds to the requested shift pattern (Normal, Winter, Sport, Tow Haul). A shift pattern status signal is transmitted from the TCM through the BCM (Gateway) to the IPC for display of the shift pattern status. P
20、owertrain will activate the last individual shift pattern requested. The DSC/ERS On/Off switch can be used as a shift preference switch. Example, when the gear selector is moved to the gated shift position, the transmission will go into sport mode. This functionality is determined through calibratio
21、ns. For all automatic transmissions, Platform shall support the serial data signals Brake Pedal Initial Travel Achieved Protection, Brake Pedal Initial Achieved Status, Brake Pedal Moderate Travel Achieved, Brake Pedal Moderate Travel Achieved Validity, and Brake Pedal Position Alive Rolling Count,
22、which may be used in auto grade braking, performance mode shift scheduling, and other Transmission control functions. Manual transmission Reverse state is used by Powertrain to determine gear state and transmit the state to Platform via the serial data link. The automatic transmission shall be capab
23、le of providing the PRNDL information via serial data messages whenever the “Accessory/Wakeup“ or “Run/Crank“ virtual network is active. One exception is during low voltage conditions associated with crank events where GMLAN communication is not required below 7 volts (GMW8772 Section 3.2 PPEI Seria
24、l Data Architecture Requirements). For Manual Transmissions, the Reverse Inhibit (inhibit reverse gear when the vehicle is moving) and Transmission Skip Shift functions (skip a gear while up-shifting), if present, are realized entirely on the Powertrain side of the interface. Some functions owned by
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