GMW-8781-2006.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8781 Platform to Powertrain Electrical Interface (PPEI) Specification Vehicle Speed and Rough Road Sensing Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Departmen
2、t: North American Engineering Standards Page 1 of 11 1 Introduction This standard defines the vehicle speed and rough road sensing between Platform and Powertrain. 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Information,
3、On-Board Diagnostics 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
4、Power Management 5. 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 Emissio
5、ns and Fuel 13. GMW8775 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 subsy
6、stem standard specifications 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 appr
7、oved standards are 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 GMW8777 GMW8767 GMW8778 GMW8768 GMW8779 GMW8769 GMW8780 GMW8
8、770 2.3 Additional References. GMPT Cruise Control Subsystem Technical Specification (SSTS) GMW8781 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 11 March 2006 3 Subsystem Requirements 3.1 Functional Overview. Vehicle speed information is
9、provided by Powertrain for various Platform functions. This information is available via serial data. A distance rolling count serial data message provided by Powertrain is required for display and navigation purposes. The counter shall be a function of at most two independent sources of data. The d
10、ata sources available may be any of the following: 1. Platform-supplied Wheel Rotational Status signals 2. Powertrain hardwired transmission output speed sensor When Wheel Rotational Status data is used to compute the distance rolling counter, Powertrain shall average the appropriate sources to comp
11、ute the distance rolling counter. This means that if one of the sources is invalid, Powertrain shall not use that value in the average. If both sources are failed, all distance rolling computations shall cease and the outgoing validity flag shall indicate INVALID. If the either source subsequently “
12、heals” itself, distance rolling computations shall resume, even during the same ignition cycle. Tire size and axle ratio information shall reside in the Powertrain electronics since it is required for vehicle speed and distance rolling count calculation Rough road information is required for Powertr
13、ain diagnostics in some vehicles. For applications that require rough road sensing, the rough road parameter shall be calculated in the ECM. The calculation shall be based on wheel speed sensor data available via serial data. GM WORLDWIDE ENGINEERING STANDARDSGMW8781 Copyright 2006 General Motors Co
14、rporation All Rights Reserved March 2006 Page 3 of 11 3.2 Hardware Overview. Powertrain shall calculate vehicle speed and distance rolling count based any of the following pieces of source data: Transmission Output Shaft Sensor or Wheel Rotational Status signals transmitted by the EBCM via the GMLAN
15、 high speed serial data link. Vehicle speed and distance information shall be transmitted by Powertrain to Platform via the GMLAN high-speed serial data link. 3.2.1 Block Diagram. The following block diagram (Figure 1) depicts a typical mechanization for the Platform-Powertrain electrical interface.
16、 This interface is the only standard defined. Serial Data Link PowertrainPlatform Transmission Output Shaft Speed (TOSS) ECM TCM PLATFORM Gateway EBCM Wheel Speed Sensor 2 or 4 Notes: 1. Vehicles with automatic transmissions are equipped with both an ECM and a TCM. TOSS is required on such applicati
17、ons and shall connect to the TCM. On vehicles without a TCM, the TOSS may connect to the ECM. 2. Vehicles with manual transmissions are not equipped with a TCM. TOSS is optional on such applications and, if available, shall connect to the ECM. 3. Platform shall provide a hardwired 4000-pulse/mile si
18、gnal if required for platform functions. Figure 1: Vehicle Speed and Rough Road Sensing Block Diagram -,-,- GMW8781 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 4 of 11 March 2006 3.3 Interface Description. 3.3.1 Serial Data Link. Vehicles equ
19、ipped with a four-channel ABS system shall provide Powertrain four high-resolution pulse accumulation/timestamp signal sets, one associated with each wheel. Vehicles equipped with a three channel ABS system shall provide Powertrain two high resolution pulse accumulation/timestamp signal sets, one as
20、sociated with the left non driven wheel and one associated with the right non driven wheel. Reference GMW8762 Section 4 PPEI GMLAN Serial Data Signal Definitions and Framing Requirements for definitions of signals listed below in Table 1. Table 1: Vehicle Speed and Rough Road Sensing Serial Data Sig
21、nals Signal Name Transmitter Notes Antilock Brake System Active Platform Required with Antilock Brake System Distance Rolling Count Average Driven Powertrain Required Distance Rolling Count Average Driven Reset Occurred Powertrain Required Distance Rolling Count Average Driven Source Powertrain Requ
22、ired Distance Rolling Count Average Driven Validity Powertrain Required Distance Rolling Count Average Non Driven Powertrain Required Distance Rolling Count Average Non Driven Reset Occurred Powertrain Required Distance Rolling Count Average Non Driven Validity Powertrain Required Driveline Final Ax
23、le Ratio Powertrain Platform Optional Traction Control System Active Platform Required with Traction Control Vehicle Speed Average Driven Powertrain Required Vehicle Speed Average Driven Source Powertrain Required Vehicle Speed Average Driven Validity Powertrain Required Vehicle Speed Average Non Dr
24、iven Powertrain Required Vehicle Speed Average Non Driven Validity Powertrain Required Vehicle Stability Enhancement System Active Platform Required with Vehicle Stability Enhancement System Wheel Distance Per Revolution Driven Powertrain Platform Optional Wheel Distance Per Revolution Non Driven Po
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- GMW 8781 2006
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