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1、 WORLWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8764 Platform to Powertrain Electrical Interface (PPEI) Specification Four Wheel Drive/All Wheel Drive Controls Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Depar
2、tment: North American Engineering Standards Page 1 of 20 1 Introduction This standard defines the Four Wheel Drive/All Wheel Drive (FWD/AWD) electrical interface be- tween Platform and Powertrain. 1.1 Applicability. The PPEI (Platform to Powertrain Electrical Inter- face) Standard Specification incl
3、udes: General In- formation, 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
4、and Gauges 4. GMW8766 Engine 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 Con- trol 10. GMW8772 Serial Data Architecture 11. GMW8773 Brakes and Traction Control 12. GMW87
5、74 Enhanced Evaporative Emissions 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 Con- trol 19. GMW8781 Vehicle Speed and Rough Road Sensin
6、g Each of the nineteen PPEI subsystem standard specifications contains the hardware, serial data, algorithms and calibrations for the named subsys- tem. The master PPEI document and all nineteen PPEI subsystem standard specifications are required to define the complete set of PPEI requirements. 2 Re
7、ferences Note: Only the latest approved standards are ap- plicable unless otherwise specified. 2.1 External Standards/Specifications. None. 2.2 GM Standards/Specifications. GMW3001 GMW8772 GMW3059 GMW8773 GMW8762 GMW8774 GMW8763 GMW8775 GMW8765 GMW8776 GMW8766 GMW8777 GMW8767 GMW8778 GMW8768 GMW8779
8、 GMW8769 GMW8780 GMW8770 GMW8781 GMW8771 3 Requirements 3.1 Functional Overview. This section applies to all cars and light duty trucks equipped with Four Wheel Drive (4WD), All Wheel Drive (AWD), and/or Axle Differential Lock Control. Medium duty truck systems are outside the scope of this document
9、. These systems are comprised of several compo- nents: 3.1.1 System Components. 3.1.1.1 Transfer Cases. The transfer case (T-case) is an integral part of 4WD powertrain systems. The primary function of the T-case is to engage four-wheel drive from two- wheel drive operation. It often also provides t
10、wo gearing ratios for four-wheel drive: high and low. 3.1.1.2 Secondary Axle. The secondary axle is another integral part of the powertrain system, which is responsible for vehicle GMW8764 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 20 M
11、arch 2006 propulsion. Secondary axles can be designed for part time or full time engagement. Part time sys- tems require actuators and controls to engage the axle when the vehicle is put into 4WD. 3.1.1.3 Clutch Packs. One (1) or more electrically controlled clutch packs are a part of active 4WD and
12、 AWD powertrain sys- tems. The clutch packs allow the distribution of powertrain torque to be controlled between the primary and secondary axles, and in some cases between the left and right wheels on the secondary axle, in order to maximize vehicle traction. 3.1.1.4 Differential Lock. An electronic
13、ally controlled lockable differential is an optional part of the powertrain system, which is responsible for vehicle propulsion. There are three differentials in a 4WD/AWD vehicle: front, rear, and center. The primary purpose of a center differential is to transmit transfer case torque to the front
14、and rear propeller shafts. The primary purpose of the front and rear axle differentials is to transmit pro- peller shaft torque to the left and right wheels. These differentials are usually “open” to allow the left and right wheels to turn at different rates when going around corners. Under certain
15、“off road” conditions, it may be desirable to “lock” both halves of an axle differential (usually rear) together to maximize traction. This control function is usually up integrated into the 4WD control module. 3.1.1.5 Control Module. Most 4WD and AWD control systems utilize a separate Powertrain re
16、leased control module to operate the transfer cases, secondary axles, and clutch packs. In some cases this function may be up integrated into the ECM. 3.1.1.6 Operator Mode Switches. Electric shift and active 4WD systems and some full time 4WD systems utilize operator-actuated switches to select ope
17、ration modes for the 4WD and differential lock systems. 3.1.1.7 Operator Displays. 4WD and differential lock control systems utilize some sort of display to indicate actual vehicle op- erating mode to the operator. This display is usu- ally an array of LED indicators on the Mode Switch. 4WD, AWD, an
18、d differential lock control systems may utilize a telltale to indicate a system fault to the operator. Viscous clutch AWD systems and single speed full time open differential 4WD systems, which do not require any electric or electronic controls are out- side the scope of this document. The following
19、 sys- tems are within the scope of this document: 3.1.2 System Types. 3.1.2.1 Manual Shift 4WD Systems. For manual shift 4WD systems, engagement and disengagement of the T-case is performed manu- ally by the operator using a shift lever. Engage- ment of the secondary axle is controlled by a limit sw
20、itch in the T-case, which closes when the T- case is in the 4WD position. These systems typi- cally have the following operating modes: 2 Wheel Drive, 4 Wheel Drive High, 4 Wheel Drive Low, and Transfer Case Neutral. In all 4WD modes, the cen- ter differential is “locked”, not allowing front to rear
21、 wheel slip. 3.1.2.2 Electric Shift 4WD Systems. For electric shift 4WD systems, engagement and disengagement of the T-case is initiated by the operator using electric switches. These switches, which can be of a “latching” or “momentary” de- sign, and are “read” by a Powertrain released con- trol mo
22、dule that in turn engages the T-case using an electric motor. The control module also controls engagement of the secondary axle. These systems typically have the following operating modes: 2 Wheel Drive, 4 Wheel Drive High, 4 Wheel Drive Low, and Transfer Case Neutral. In all 4WD modes, the center d
23、ifferential is “locked”, not allow- ing front to rear wheel slip. 3.1.2.3 Active Control 4WD Systems. Active Control 4WD systems have all of the fea- tures and operating modes of the electric shift 4WD systems, but also add a clutch pack assem- bly in the T-case that allows operation in an addi- tio
24、nal Auto 4WD mode. In the Auto 4WD mode, the center differential is “open” and the distribution of powertrain torque between the primary and secon- dary axles is controlled using the clutches to maximize vehicle traction. In the “auto” mode, the control module controls the initiation and duration of
25、 the torque shift, and con- tinually updates the percent torque to the secon- dary axle. The control module determines that torque is needed at the secondary wheels when the primary wheels slip or when slip is anticipated. This is accomplished by monitoring the front and rear transfer case output sp
26、eeds as well as the throttle position. The system also monitors braking activity and deactivates the “auto” mode thus en- suring the vehicle is in two-wheel drive during an anti-lock braking event. 3.1.2.4 Full Time 4WD Systems. Full Time 4WD systems have many of the features of the electric shift 4
27、WD systems, but eliminate control of the secondary axle, which is always en- gaged. These systems typically have the following -,-,- GM WORLDWIDE ENGINEERING STANDARD GMW8764 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 3 of 20 operating modes: AWD (also known as “Fu
28、ll Time 4 Wheel Drive”), 4 Wheel Drive High, 4 Wheel Drive Low, and Transfer Case Neutral. In the AWD mode the center differential is “open”, allowing front to rear wheel slip, while in the 4WD High and 4WD Low modes the center differential is “locked”, thus not allowing front to rear slip. Optional
29、ly, these systems may also offer the op- erator the ability to control the engagement of an axle differential lock. Differential lock control allows both halves of an axle to be electrically locked to- gether to eliminate side-to-side wheel slip. TCCM differential lock control does not apply to eLSD
30、 (electrical Limited Slip Differential) type sys- tems. 3.1.2.5 Active Control and Active on Demand AWD Systems. Active Control and Active On Demand (e.g., Ver- saTrak) AWD systems are full time systems that have one or more clutch pack assemblies that al- low vehicle traction to be maximized. The c
31、lutch pack(s) allow the distribution of powertrain torque to be controlled between the primary and secon- dary axles, and in some cases between the left and right wheels on the secondary axle, in order to maximize vehicle traction. Internal “self protection” algorithms can disable AWD operation unde
32、r cer- tain circumstances (e.g. mini spare tire detected, etc.). Active AWD systems do not have the secon- dary axle actuators, operator mode switches, or traditional transfer cases that are normally associ- ated with 4WD systems. Active AWD systems may utilize a powertrain - released stand alone co
33、ntrol module, or the control algorithms may be up inte- grated into the Engine Control Module (ECM). 3.2 Hardware Overview. The description of this subsystem covers the serial data link and discrete wiring between the Power- train electronics and various platform components, including the Platform e
34、lectronics, operator mode request switch, secondary axle actuator, and dif- ferential lock actuator. 3.2.1 Block Diagrams. The following block diagrams (Figure 1 Figure 4) depict typical Platform-Powertrain electrical inter- face mechanizations for the manual shift 4WD, electric shift/active control
35、 4WD, full time 4WD con- trol, and active AWD control systems. The inter- face is the only standard defined. -,-,- GMW8764 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 4 of 20 March 2006 3.2.1.1 Manual Shift AWD Block Diagram. 3119-010(08/02)
36、PowertrainPlatform Powertrain Electronics (ECM/TCM) Serial Data Link Platform Electronics Secondary Axle Feedback (4WD Mode) Secondary Axle Control 4WD Switch 4WD Low SwitchSecondary Axle Assy Manual Transfer Case Run Crank Actuator Electronics M 3K Figure 1: Manual Shift AWD Block Diagram -,-,- GM
37、WORLDWIDE ENGINEERING STANDARD GMW8764 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 5 of 20 3.2.1.2 Electric Shift/Active Control 4WD Block Diagram. Mode Request Auto(2) 2H 4H Nuetral Operator Mode Request Switch Transfer Case Motors, Switches, Sensors approved by Th
38、e Global PPEI Core Team in De- cember 2003 and initially published in February 2004 for the Global PPEI Version 3.4. 9.2 Revisions. Rev Approval Date Description (Organization) A Aug 2004 Global PPEI Version 3.5 Re- lease. B Jul 2005 Global PPEI Version 3.6 Re- lease. C Mar 2006 Global PPEI Version
39、3.6 Re- lease -,-,- GMW8764 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 26 of 20 March 2006 Appendix A The following are approved Change Request(s) (CRs) for the Global PPEI Version 3.7 Release that impacted the GMW8764 Four Wheel Drive/All W
40、heel Drive Subsystem: Sections Changed Description Of Changes Rationale/Authorization 3.3.1 Added new GMLAN Signal Transmission Platform Shift Pattern Switch Active. Parent CR 318 Child CR 482 3.3.1 Added the following GMLAN Signals and identified the usage: 1. Center Differential Status, 2. Diagnos
41、tic Trouble Code Information Ex- tended, 3. Secondary Axle Engaged, Added the following signals as also used for Manual Shift: 1. Transfer Case Mode, 2. Transfer Case Mode Validity, 3. Transfer Case Range, and 4. Transfer Case Range Validity CR 323 3.3.1 Revise Transmission Platform Shift Pattern Sw
42、itch Active (added per Parent CR 318 Child CR 482) to Transmission Platform Shift Pattern Switch 1 Active in Table 1. Add the following signals: Transmission Platform Shift Pattern Switch 2 Active, Transmission Platform Shift Pattern Switch 3 Active and Transmission Plat- form Shift Pattern Switch 4 Active CR 571