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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8775 Platform to Powertrain Electrical Interface (PPEI) Specification Exhaust After-Treatment Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North Amer
2、ican Engineering Standards Page 1 of 7 1 Introduction This standard defines the Exhaust After-Treatment electrical interface requirements between Platform and Powertrain. 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Inform
3、ation, 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
4、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 Control 10. GMW8772 Serial Data Architecture 11. GMW8773 Brakes and Traction Control 12. GMW8774 Enhanced Evaporative
5、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 Control 19. GMW8781 Vehicle Speed and Rough Road Sensing Each of the nineteen PPE
6、I subsystem 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 late
7、st approved 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 GMW8776 GMW8765 GMW8777 GMW8766 GMW8778 GMW8767 GMW8779 GMW8768 GMW8780 GMW8769 GMW87
8、81 GMW8770 2.3 Additional References. None. GMW8775 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 7 March 2006 3 Subsystem Requirements 3.1 Functional Overview. This section includes the electrical interfaces required for Air Injection Rea
9、ction (AIR), defines the Exhaust Flapper Valve (EFV) interface requirements and defines the powertrain optional requirements to meet Transitional Low Emissions Vehicle (TLEV), Low Emissions Vehicle (LEV) and/or Ultra Low Emissions Vehicle (ULEV) emissions standards. This function is powertrain optio
10、nal in order to meet TLEV, LEV and/or ULEV emissions standards. The AIR system introduces airflow into the exhaust system to increase oxygen that reacts with the hydrocarbons. This reduces the hydrocarbons from the engine exhaust gas. Exhaust flapper valves are electromechanical actuated valves that
11、 are located in the exhaust system and are controlled by a Platform module. The valve(s) open and close depending on engine speed and loads and are typically used with displacement on demand (DoD) engines. The valves change the exhaust gas path resistance by routing exhaust gases through additional
12、muffler channels. Additional routing will provide reduced exhaust noise during certain known engine loads and conditions. Powertrain and platform functional requirements used for determining the control requirements for the Exhaust Flapper Valve (EFV) control function are listed below: The Powertrai
13、n electronics shall determine and communicate the following information to be used by Platform in determining the state of the EFV relay. Calculate and communicate engine speed to the EFVM. Communicate when Displacement on Demand (DoD) mode is being entered and request Platform (EFVM) to prepare for
14、 DoD event. Perform diagnostic data master functions based on active DTC information transmitted from the EFVM Communicate Legislated OBD II diagnostic information to service tool. Detect and Communicate when erroneous ECM data is present which may impact Platform control of the EFV relay. The Platf
15、orm shall provide the following algorithm interfaces: The control algorithm required to determine when to command the Exhaust Flapper Value opening and closure. A discrete output function to control the state of the EFV relay A PWM input function to read the position of the EFV. Perform appropriate
16、OBD II diagnostics functions EFVM I/O functions. -,-,- GM WORLDWIDE ENGINEERING STANDARDSGMW8775 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 3 of 7 3.2 Hardware Overview. The interface for AIR consists of discrete AIR Pump Command and AIR Valve Command outputs from
17、the powertrain electronics to two platform relays. The platform relays provide controlled power feeds to the powertrain AIR Pump and the optional AIR Valve(s). Some AIR systems may have additional Powertrain controls, which do not impact the interface with platform. 3.2.1 Block Diagram. The followin
18、g block diagram (Figure 1) depicts a typical mechanization. The electrical interface between Powertrain and Platform is the only standard defined. Figure 1: Exhaust After-Treatment Block Diagram AIR PUMP AIR Pump Signal AIR Pump Command POWERTRAIN PLATFORM Battery N/O AIR Pump Relay AIR Valve(s) AIR
19、 Valve Command Powertrain Relay Battery N/O AIR Valve Relay AIR Valve Signal Powertrain Relay Notes: (1) Some applications may drive a low current AIR valve directly from the Powertrain electronics without implementing the AIR valve relay. (2) Differential Pressure Sensor and Exhaust Gas Temperature
20、 Sensors are Optional to meet EOBD emissions for Diesel Engines (1) Diesel Particulate Filter Differential Pressure Sensor (2) Platform Electronics Serial Data Link Exhaust Gas Temperature Sensor 2 Exhaust Gas Temperature Sensor 1 (2) (2) Exhaust Valve Controller/ Motor FSCM Valve Position Signal Ru
21、n/Crank Powertrain Electronics -,-,- GMW8775 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 4 of 7 March 2006 Table 1: Exhaust After-Treatment Serial Data Signals Signal Name Transmitter Notes Engine Cylinder Deactivation Event Pending Powertrai
22、n Required with EFV Engine Run Active Powertrain Required with EFV Engine Speed Powertrain Required with EFV Exhaust Pressure Regulator Valve Position Platform Required with EFV Exhaust Pressure Regulator Valve Position Validity Platform Required with EFV Legislated Diagnostics Standard Conditions F
23、ault PresentPowertrain Optional with EFV in non-OBD markets, required for OBD II Legislated Diagnostics Standard Conditions Met Powertrain Optional with EFV in non-OBD markets, required for OBD II Mass Air Flow Powertrain Required with EFV Mass Air Flow Validity Powertrain Required with EFV Powertra
24、in Exhaust Particle Filter Warning Indication On Powertrain Required (With Diesel) Powertrain High Electrical Load Requested Powertrain Required (With Diesel) System Power Mode Platform Required with EFV 3.3 Interface Description. 3.3.1 Serial Data Link. Reference GMW8762 Section 4 PPEI GMLAN Serial
25、 Data Signal Definitions and Framing Requirements for definitions of signals listed below in Table 1. 3.3.2 AIR Pump Signal. This signal is a power feed to the AIR Pump from the AIR Relay. It is switched to Battery voltage when the AIR Pump Command is low. This interface may be emissions-related. Re
26、fer to GMW8762 Section 1.4 PPEI On-Board Diagnostic Requirements for platform design guidelines. 3.3.3 AIR Pump Command. This signal is a discrete low-side driver output of the powertrain electronics to the AIR Pump Relay. The AIR Pump is commanded on through the relay when this signal is asserted l
27、ow. The AIR Pump shall not be commanded on prior to engine starting. Platform shall power the relay coil from the Powertrain Relay. This interface may be emissions-related. Refer to GMW8762 Section 1.4 PPEI On-Board Diagnostic Requirements for platform design guidelines. 3.3.4 AIR Valve Signal. This
28、 signal is a power feed to the AIR Valve from the AIR Valve Relay. It is switched to Battery voltage when the AIR Valve Command is low. This interface may be emissions-related. Refer to GMW8762 Section 1.4 PPEI On-Board Diagnostic Requirements for platform design guidelines. 3.3.5 AIR Valve Command.
29、 This signal is a discrete low-side driver output of the powertrain electronics to the AIR Valve Relay. The AIR Valve is commanded on through the relay when this signal is asserted low. The AIR Valve shall not be commanded on prior to engine starting. Platform shall power the relay coil from the Pow
30、ertrain Relay. Note: some applications may drive a low current AIR valve directly from the Powertrain electronics without implementing the AIR valve relay. This interface may be emissions-related. Refer to GMW8762 Section 1.4 PPEI On-Board Diagnostic Requirements for platform design guidelines. 3.4
31、Failure Modes and Diagnostics. In OBD applications, Powertrain shall turn on the Service Engine Soon (MIL) telltale and set the appropriate diagnostic trouble codes if faults are detected with any of the OBD relevant components. 3.5 Electrical Characteristics. 3.5.1 AIR Pump Signal. Specific voltage
32、, current, and recommended fusing requirements shall be provided by Powertrain. -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW8775 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 5 of 7 This interface may be emissions-related. Refer to GMW8762 Section 1.4 PPEI On-Board Di
33、agnostic Requirements for platform design guidelines. 3.5.2 AIR Pump Command. The output of the Powertrain electronics shall have the characteristics of a low-side driver, LSD2, as described in GMW8762 Section 3.1 PPEI Electrical Requirements. This interface may be emissions-related. Refer to GMW876
34、2 Section 1.4 PPEI On-Board Diagnostic Requirements for platform design guidelines. 3.5.3 AIR Valve Signal. Specific voltage, current, and recommended fusing requirements shall be provided by Powertrain. This interface may be emissions-related. Refer to GMW8762 Section 1.4 PPEI On-Board Diagnostic R
35、equirements for platform design guidelines. 3.5.4 AIR Valve Command. The output of the Powertrain electronics shall have the characteristics of a low-side driver, LSD2, as described in GMW8762 Section 3.1 PPEI Electrical Requirements. This interface may be emissions-related. Refer to GMW8762 Section
36、 1.4 PPEI On-Board Diagnostic Requirements for platform design guidelines. 4 Algorithm None. 5 Provisions for Shipping Not Applicable. 6 Notes 6.1 Glossary None. 6.2 Acronyms, Abbreviations, and Symbols. See GMW8762 Appendix Section A.3 7 Additional Paragraphs 7.1 All materials supplied to this spec
37、ification must comply with the requirements of GMW3001, Rules and Regulations for Materials Specifications. 7.2 All materials supplied to this specification must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 8 Coding System This specification shall be refer
38、enced in other documents, drawings, VTS, CTS, etc. as follows: GMW8775 9 Release and Revisions 9.1 Release. This general specification originated in June 2003; approved by The Global PPEI Core Team in December 2003 and initially published in February 2004 for the Global PPEI Version 3.4. 9.2 Revisio
39、ns. Rev Approval Date Description (Organization) A Aug 2004 Global PPEI Version 3.5 Release. B Jul 2005 Global PPEI Version 3.6 Release. C Mar 2006 Global PPEI Version 3.7 Release. -,-,- GMW8775 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 6 o
40、f 7 March 2006 Appendix A The following are approved Change Requests (CRs) for the Global PPEI Version 3.7 Release that impacted the GMW8775 Exhaust After-Treatment Subsystem: Sections Changed Description of Change Rationale/Authorization No changes were made to GMW8775 Exhaust After Treatment Subsystem Standard for the Global PPEI Version 3.7 Release. -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW8775 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 7 of 7 Deviations None. -,-,-