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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8779 Platform to Powertrain Electrical Interface Specification Post Collision Operation Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North American E
2、ngineering Standards Page 1 of 13 1 Introduction This standard defines the Post Collision Operation electrical interface between Platform and Powertrain. 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Information, On-Board D
3、iagnostics 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 Mana
4、gement 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 Emissions and Fue
5、l 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 subsystem stand
6、ard 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 approved stand
7、ards 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 GMW8780 GMW8769 GMW8781 GMW8770 2.3 Ad
8、ditional References. Global Occupant Protection Subsystem Technical Specification (SSTS) 3 Subsystem Requirements 3.1 Functional Overview. The Post Collision Operation Subsystem includes two functions: Event Data Recording and Fuel Shutdown. The Event Data Recording (EDR) system provides for the per
9、manent retention of vehicle operating parameters following a collision event. The Vehicle Platform records certain information regarding the operating status of Powertrain as part of its EDR functionality. To support this functionality the Powertrain shall periodically transmit information indicatin
10、g its operational status during normal vehicle operation, independent of any collision indication, so as to refresh the data available in the Vehicle Platforms volatile data buffer. GMW8779 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 13
11、March 2006 The Fuel Shutdown function provides the capability to shut the fuel delivery system off in a controlled manner after a collision has been detected. 3.2 Hardware Overview. 3.2.1 Block Diagram. The following block diagram (Figure 1) depicts a typical mechanization for the Pre and Post Colli
12、sion Operation between the Platform- Powertrain Electrical Interface. This interface is the only standard defined. 3.3.1 Serial Data Link. Reference GMW8762 Section 4 PPEI GMLAN Serial Data Signal and Definitions and Framing for definitions of signals listed below in Table 1. 3.3.2 Calibrations. The
13、 following Table 2 contains calibrations 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 for details. 3.
14、4 Failure Modes and Diagnostics. Reference GMW8772 Section 3.4 PPEI Serial Data Architecture Requirements for serial data failure modes and diagnostic information. 3.5 Electrical Characteristics. Not applicable. Powertrain Powertrain Electronics Serial Data Link Platform Electronics Platform Figure
15、1: Pre and Post Collision Operation Block Diagram Table 1: Pre-Collision and Event Data Recording (EDR) Serial Data Signals Signal Name Transmitter Notes Accelerator Actual Position Powertrain Required Accelerator Actual Position Validity Powertrain Required Cruise Control Active Powertrain Required
16、 Engine Speed Powertrain Required Engine Speed Status Powertrain Required Engine Torque Actual Extended Range Powertrain Required Engine Torque Actual Extended Range Validity Powertrain Required Airbag Deployed Platform Required Airbag Virtual Device Availability Platform Required Reduced Power Indi
17、cation On Powertrain Required Throttle Position Powertrain Required Throttle Position Validity Powertrain Required Vehicle Speed Average Driven Powertrain Required Vehicle Speed Average Driven Source Powertrain Required -,-,- GM WORLDWIDE ENGINEERING STANDARDSGMW8779 Copyright 2006 General Motors Co
18、rporation All Rights Reserved March 2006 Page 3 of 13 Signal Name Transmitter Notes Vehicle Speed Average Driven Validity Powertrain Required Vehicle Speed Average Non Driven Powertrain Required Vehicle Speed Average Non Driven Validity Powertrain Required Table 2: Post Collision and Event Data Reco
19、rding Calibration Table Calibration Name Location Owner K_FPMR_v_PCFS_VSS Powertrain Platform K_FPMR_t_PCFS_DsblFuelPumpTime Powertrain Platform K_FPMR_t_PCFS_DsblInjector Time Powertrain Platform K_FPMR_b_PCFS DirectInject Powertrain Platform K_FPMR_b_PCFS_Enable Powertrain Platform K_FPMR_t_PCFS_H
20、ighVSSTime Powertrain Platform -,-,- GMW8779 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 4 of 13 March 2006 4 Post Collision Fuel Shutdown Algorithm 4.1 General Algorithm Requirements 4.1.1 General Overview This process performs post collisio
21、n fuel shutdown based upon an airbag deployment, if desired the Post Collision Fuel Shutdown (PCFS) algorithm may be enabled/disabled by the use of a calibration. If the vehicle is equipped with an airbag system and in the event of airbag deployment, the platform will transmit the GMLAN signal Airba
22、g Deployed to the ECM. Upon receiving this signal, the ECM shall execute the fuel shutdown algorithm within 100ms. The vehicle has to virtually stop for a calibratable period of time before a controlled shutdown of the fuel delivery system is performed. Some features of the fuel shutdown algorithm a
23、re as follows: A. If a vehicle speed fault exists and the vehicle speed cannot be determined, fuel shutdown will not be performed. B. Engine starting after a fuel shutdown will be enabled within the standard Immobilizer logic (i.e. the vehicle acts the same as it would with any stall). If the vehicl
24、e has been below a calibrated speed continuously for a calibrated period of time, and the Airbag Deployed is ”True” and the Airbag Virtual Device Availability is equal to “Virtual Device Available”, then the fuel shutdown action is triggered as follows: 1. Port Fuel Injection Systems: The Fuel Pump
25、is commanded off. Subsequently, after another cal period of time, injectors are commanded off. 2. Direct Cylinder Injection Systems (Diesel, Spark Ignition Direct Injection): All fuel delivery system pumps and injectors are turned off 3. For dual fuel tank applications, the fuel transfer pump shall
26、use a variable internal to the ECM to turn off any transfer pumps. C. After an airbag deployment, if the vehicle continues to be above a calibrated vehicle speed for a calibrated period of time, the fuel shutdown logic shall be aborted and no action shall be taken. -,-,- GM WORLDWIDE ENGINEERING STA
27、NDARDS GMW8779 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 5 of 13 4.1.2 Context Diagram/State Transition Diagram Figure 3: Post Collision Fuel Shutdown (PCFS) State Transition Diagram -,-,- GMW8779 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Co
28、rporation All Rights Reserved Page 6 of 13 March 2006 4.1.3 Platform Algorithm Requirements Platform shall transmit to Powertrain an indication of whether or not an airbag system virtual device is present via the signal Airbag Virtual Device Availability. If an airbag system virtual device is presen
29、t then Platform shall transmit the state of the airbag deployment via the signal Airbag Deployed. This signal Airbag Deployed is set to TRUE upon physical deployment of airbag(s) and remains “True” as specified by the Global Occupant Protection Subsystem Technical Specification. 4.1.4 Powertrain Alg
30、orithm Requirements SELECT_FIRST Null State: WHEN ( VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NullState ) no action Initial State: VeFPMR_b_AirbagDeployed_Latched = FALSE WHEN ( VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_InitialState ) IF ( K_FPMR_b_PCFS_Enable = TRUE ) THEN IF ( VeFPMR_b_AirbagLostComm = FALSE
31、) THEN VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NormalOpState ELSE no action ENDIF ELSE VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NullState ENDIF NormalOpState: WHEN ( VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NormalOpState ) IF ( VeFPMR_b_AirbagDeployed = TRUE AND VeFPMR_b_AirbagDeployed_Latched = FALSE ) THEN VeFP
32、MR_e_PCFS_State = VeFPMR_e_PCFS_TriggerState1 VeFPMR_t_PCFS_LowVSSTimer = 0 VeFPMR_t_PCFS_HighVSSTimer = 0 VeFPMR_b_AirbagDeployed_Latched= TRUE ELSE no action ENDIF TriggerState1: WHEN ( VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_TriggerState1 ) IF ( VeVSPR_b_VehicleSpeedFA = TRUE ) THEN VeFPMR_e_PCFS_Sta
33、te = VeFPMR_e_PCFS_NullState ELSE IF ( VeVSPR_v_Vehicle = K_FPMR_t_PCFS_DsblFuelPumpTime ) THEN -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW8779 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 7 of 13 IF (K_FPMR_b_PCFS DirectInject = FALSE) THEN VeFPMR_b_PCFS_DisableFue
34、lPump = TRUE VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_TriggerState2 VeFPMR_t_PCFS_LowVSSTimer = 0 ELSE VeFPMR_b_PCFS_DisableFuelPump = TRUE VeFPMR_t_PCFS_LowVSSTimer = 0 VeFPMR_b_PCFS_DisableInjectors = TRUE VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NullState ENDIF ELSE no action ENDIF ELSE VeFPMR_t_PCFS_LowVS
35、STimer = 0 INCREMENT VeFPMR_t_PCFS_HighVSSTimer IF ( VeFPMR_t_PCFS_HighVSSTimer = K_FPMR_t_PCFS_HighVSSTime ) THEN VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NullState ELSE no action ENDIF ENDIF ENDIF TriggerState2 WHEN ( VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_TriggerState2 ) INCREMENT VeFPMR_t_PCFS_LowVSSTim
36、er IF ( VeFPMR_t_PCFS_LowVSSTimer = K_FPMR_t_PCFS_DsblInjectorTime ) THEN VeFPMR_b_PCFS_DisableInjectors = TRUE VeFPMR_e_PCFS_State = VeFPMR_e_PCFS_NullState ELSE no action ENDIF END_SELECT 4.1.5 Execution/Activation Requirements. Table 3: Post Collision and Event Data Recording Execution Requiremen
37、ts Algorithm Section Platform Maximum Execution Interval Powertrain Maximum Execution Interval Post Collision Fuel Shutdown 100 ms 100 ms 4.1.6 Diagnostic Requirements Not applicable. -,-,- GMW8779 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page
38、8 of 13 March 2006 4.2 Data Dictionary 4.2.1 Calibrations All calibrations are Platform Owned: K_FPMR_v_PCFS_VSS = When the airbag is deployed and VSS has been less than this cal for some time, fuel shut down is asserted. Units: Km per hour Minimum Range: 0 to 10.0 Minimum Resolution: 0.1 Typical va
39、lues: 10.0 Location: Powertrain Owner: Platform K_FPMR_t_PCFS_DsblFuelPumpTime = When the airbag is deployed and Vss has been low for this cal time, fuel pump is disabled. Units: seconds Minimum Range: 0 to 100 Minimum Resolution: 0.1 Typical values: 0.4 Location: Powertrain Owner: Platform K_FPMR_t
40、_PCFS_DsblInjector Time = When airbag is deployed and fuel pump is disabled, wait for this cal time then command disabling injectors. (Not used for Direct Cylinder Injection Systems) Units: seconds Minimum range: 0 to 100 Minimum resolution: 0.1 Typical values: 0.2 Location: Powertrain Owner: Platfo
41、rm K_FPMR_b_PCFS DirectInject = Calibration to identify fuel system as DirectInjection. Units: FALSE; TRUE Typical Value: FALSE (TRUE for Diesel or SIDI) Location: Powertrain Owner: Platform K_FPMR_b_PCFS_Enable = Calibration to enable PCFS algorithm. Units: FALSE; TRUE Typical Value: TRUE Location:
42、 Powertrain Owner: Platform K_FPMR_t_PCFS_HighVSSTime = When airbag is deployed and VSS has been above a cal for this amount of time (for any reason), no fuel off is commanded. Units: seconds Minimum range: 0 to 100 Minimum resolution: 0.1 Typical values: 30.0 -,-,- GM WORLDWIDE ENGINEERING STANDARD
43、SGMW8779 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 9 of 13 4.2.2 Variables VeFPMR_b_AirbagDeployed_Latched = This is initialized to FALSE at the transition from Key off to run (see Initial State) Set to TRUE when Airbag Deployed is received. Unit: Boolean Values:
44、FALSE, TRUE VeFPMR_b_PCFS_DisableFuelPump = Indication to command the disabling of the fuel pump due to post collision fuel shutdown assertion. For dual fuel tank applications, this flag is also used as an output for disabling the transfer pump. Unit: Boolean Values: FALSE, TRUE VeFPMR_b_PCFS_Disabl
45、eInjectors = Indication to command the disabling of the fuel injectors due to post collision fuel shutdown assertion. Unit: Boolean Values: FALSE, TRUE VeVSPR_b_VehicleSpeedFA = indication that a vehicle speed fault is active VeVSPR_v_Vehicle = vehicle speed VeFPMR_t_PCFS_LowVSSTimer = Amount of tim
46、e used for tracking how long the vehicle speed is low (below cal) after airbag is deployed. Units: second Minimum_range: 0 to 100 Minimum _resolution: 0.1 VeFPMR_t_PCFS_HighVSSTImer = Amount of time used for tracking how long the vehicle speed is high (above cal) after airbag is deployed. Units: sec
47、ond Minimum range: 0 to 100 Minimum resolution: 0.1 VeFPMR_e_PCFS_State = Identifies the current state of PCFS. Type: enumerations: Values: VeFPMR_e_PCFS_InitialState VeFPMR_e_PCFS_NormalOpState VeFPMR_e_PCFS_TriggerState1 VeFPMR_e_PCFS_TriggerState2 VeFPMR_e_PCFS_NullState GMW8779 GM WORLDWIDE ENGI
48、NEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 10 of 13 March 2006 VeFPMR_b_AirbagDeployed = This is set to “TRUE“ when the signal Airbag Deployed is equal to “True“, indicating that the airbag has been deployed in this key cycle. Values: FALSE, TRUE VeFPMR_b_AirbagLostComm = Needs to be set to TRUE when there is a loss of communication between the ECM and the source module of airbag OR when the signal Airbag Virtual Device Availability is equal to “Virtual Device Unavaila