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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8769 Platform to Powertrain Electrical Interface (PPEI) Specification Cruise Control Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North American Engi
2、neering Standards Page 1 of 27 1 Introduction This standard defines the Cruise Control electrical interface between Platform and Powertrain. 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Information, On-Board Diagnostics an
3、d 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. GMW
4、8767 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. GMW8775
5、 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 specifica
6、tions 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 appl
7、icable unless otherwise specified. 2.1 External Standards/Specifications. None. 2.2 GM Standards/Specifications. GMW3001 GMW8772 GMW3059 GMW8773 GMW8762 GMW8774 GMW8763 GMW8775 GMW8764 GMW8776 GMW8765 GMW8777 GMW8766 GMW8778 GMW8767 GMW8779 GMW8768 GMW8780 GMW8770 GMW8781 GMW8771 2.3 Additional Refe
8、rences. GMPT Cruise Control Subsystem Technical Specification (SSTS) Adaptive Cruise Control Subsystem Technical Specification (SSTS) 3 Subsystem Requirements 3.1 Functional Overview. The interface defined in this section shall apply specifically to the following subsystems relating to throttle cont
9、rol: Conventional Cruise Control Adaptive Cruise Control (ACC) 3.1.1 Conventional Cruise Control. Conventional Cruise Control shall control the vehicle speed to an operator selectable speed. The operator shall apply cruise mode switches to enable and engage cruise as well as select and GMW8769 GM WO
10、RLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 27 March 2006 adjust the driver-selected speed. The cruise control subsystem shall control to the driver- selected speed using the ETC subsystem. The disabling and disengagement of the subsystem is
11、affected via operator application of the brake pedal, On/Off switch, clutch switch or Clutch Pedal Position sensor (manual transmission only), as well as other defined disengagement criteria. The cruise mode switches shall interface to a platform module, which forwards the switch states to the ECM v
12、ia GMLAN signals. The interpretation of the cruise mode switches, associated moding and closed loop control shall reside within the ECM. The brake pedal apply sensing shall be provided by the platform via both a discrete input and a GMLAN signal to the ECM. 3.1.2 Adaptive Cruise Control (ACC). Adapt
13、ive Cruise Control maintains a driver selected vehicle speed or maintains a driver adjustable headway to a preceding licensable vehicle moving slower than the driver selected vehicle speed. ACC automatically switches between speed control and headway control. Headway control and speed control are ac
14、complished by requesting limited automatic braking or using the ETC subsystem for throttle control. The ACC function includes features that allow the driver to: a) Engage the ACC function b) Select the maximum vehicle speed (driver selected speed) to be maintained while ACC is engaged c) Adjust the
15、headway to be maintained to a preceding licensable vehicle moving slower than the driver selected vehicle speed d) Override the ACC vehicle speed control using the accelerator pedal e) Disengage the ACC function using On/Off switch or depression of brake pedal, as well as other defined disengagement
16、 criteria The cruise mode switches shall interface to a platform module, which forwards the switch states to both the ACC module and ECM via GMLAN signals. The brake pedal apply sensing shall be provided by a platform module via a GMLAN signal to the ACC module and ECM. Additionally, a discrete inpu
17、t indicating brake pedal apply state shall be provided to the ECM. The ECM shall transmit a GMLAN signal indicating the state of the discrete brake signal to the ACC module. The interpretation of the cruise mode switches, and associated moding shall reside within the ACC module. The ACC module deter
18、mines a desired vehicle response and forwards an appropriate request to the ECM in the form of a vehicle acceleration (deceleration if the value is negative). Note, this acceleration request does not reflect the absolute vehicle acceleration level desired. This acceleration request shall be modified
19、 as necessary to comprehend external disturbances, such as road grade, wind, vehicle mass variation, etc. The ECM converts the acceleration value to an axle torque request and delivers torque accordingly. This conversion within the ECM is an open-loop translation. The ECM does not modify this conver
20、sion based on any external disturbances. For example if the vehicle is climbing a hill, a given acceleration request will be translated to the same axle torque that would be calculated on a level road. The ECM requires a vehicle model to translate the vehicle acceleration request to an axle torque.
21、The vehicle model contains vehicle specific characteristics such as effective tire rolling radius, vehicle mass, rolling resistance, and aerodynamic coefficients. The platform is responsible for providing a calibration value reflecting the vehicle mass, to be located in the ECM. The mass will typica
22、lly reflect the mass of the vehicle with just the driver present. This document does not comprehend ACC applications with manual transmissions, as there are currently no such applications. The ECM as part of a rationality check shall monitor several key signals. The ECM processing this information r
23、edundant to the ACC module enhances the systems robustness. The signals monitored shall include key enable and disengagement criteria, such as the cruise switch states, brake pedal apply states and vehicle speed. The rationality check must successfully pass prior to the ECM responding to an ACC requ
24、est for throttle control. If the ECM determines a signal is in a state where ACC should be disengaged, the ECM shall execute a disengagement as well as communicate the disengagement to the ACC module using the Adaptive Cruise Control Powertrain Inhibit Request signal. GM WORLDWIDE ENGINEERING STANDA
25、RDSGMW8769 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 3 of 27 3.2 Hardware Overview. The electrical interface between the Platform Electronics and the Powertrain Electronics for the Cruise Control Subsystem consists of the serial data link and two inputs. One input
26、 is the Brake Pedal Apply input, which is defined in GMW8773 Section 3 PPEI Brakes and Traction Control subsystem Requirements. The second input is a Top-of-Travel Clutch Switch or Clutch Pedal Position sensor, which is required with manual transmission vehicles with cruise control and not present w
27、ith automatic transmissions 3.2.1 Block Diagram. The following block diagram (Figure 1) depicts the mechanization for Conventional Cruise Control and Adaptive Cruise Control. The mechanization is not intended to specify the entire subsystem mechanization but rather aspects crossing the PPEI boundary
28、. The electrical interface between Powertrain and Platform is the only standard defined. Figure 1: Conventional and Adaptive Cruise Control Block Diagram Brake Pedal Apply TCM Serial Data Link POWERTRAIN PLATFORM Platform Electronics Top of Travel Clutch N/C Top of Travel Clutch Switch (Optional wit
29、h Manual Trans Only) Run/Crank Cruise Mode Switches 1 PRNDL ACC Module 2 ECM 3, 4 Notes: 1. See GMW8769 Section 3.3.5 for requirements on Cruise Mode Switches. 2. See GMW8773 Section 3.3.3 for more details on Brake Pedal Apply signal. 3. See GMW8769 Section 3.3.4 Top of Travel Clutch. 4. Alternative
30、ly a Clutch Pedal Position Sensor may provide this information. Reference GMW8777 for more details. -,-,- GMW8769 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 4 of 27 March 2006 3.3 Interface Description. 3.3.1 Serial Data Link. Reference GMW8
31、762 Section 4 PPEI GMLAN Serial Data Signal and Definitions and Framing for definitions of signals listed in Table 1. 3.3.2 Calibrations. The Cruise Control calibrations that cross the Platform Powertrain Electrical Interface (i.e., are located in devices on one side of the interface but controlled
32、by the other side of the interface or driven by variation in the other side of the interface) are located in Table 2. Refer to Section 4 for calibration details. Table 1: Cruise Control Serial Data Signals Signal Name Transmitter Notes Adaptive Cruise Control Active Platform Required with ACC Adapti
33、ve Cruise Control Braking Active Platform Required with ABS Adaptive Cruise Control Command Platform Required with ACC Adaptive Cruise Control Command Alive Rolling Count Platform Required with ACC Adaptive Cruise Control Command Protection Platform Required with ACC Adaptive Cruise Control Powertra
34、in Acceleration Request Superceded Powertrain Required Adaptive Cruise Control Powertrain Inhibit Request Powertrain Required Adaptive Cruise Control Transmission Gear Request Powertrain Required Apply Brake Before Cruise Indication On Powertrain Required Automatic Transmission Commanded Gear Powert
35、rain Required Brake Pedal Driver Applied Pressure Detected Platform Required with ABS Brake Pedal Driver Applied Pressure Detected Validity Platform Required with ABS Brake Pedal Initial Travel Achieved Status Platform Required Brake Pedal Initial Travel Achieved Protection Platform Required Brake P
36、edal Position Alive Rolling Count Platform Required Cruise Control Active Powertrain Required Cruise Control Cancel Request Platform Required Cruise Control Driver Selected Speed Powertrain Required Cruise Control Driver Selected Speed Active Powertrain Required Cruise Control Enabled Powertrain Req
37、uired Cruise Control Switch Status Platform Required Cruise Control Switch Status Alive Rolling Count Platform Required Cruise Control Switch Status Protection Value Platform Required Display Measurement System Platform Required Driver Throttle Override Detected Powertrain Required Driver Throttle O
38、verride Detected Protection Value Powertrain Required Driver Throttle Override Detection Alive Rolling Count Powertrain Required GM WORLDWIDE ENGINEERING STANDARDSGMW8769 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 5 of 27 Signal Name Transmitter Notes Engine Speed
39、Powertrain Required Engine Speed Status Powertrain Required Engine Torque Actual Extended Range Powertrain Required Engine Torque Actual Extended Range Validity Powertrain Required Park Brake Switch Active Platform Required Park Brake Virtual Device Availability Platform Required Power Take Off Acti
40、ve Platform Required Powertrain Brake Pedal Discrete Input Status Powertrain Required Powertrain Brake Pedal Discrete Input Status Validity Powertrain Required Top of Travel Clutch Switch Active Powertrain Required Top of Travel Clutch Switch Active Validity Powertrain Required Traction Control Syst
41、em Active Platform Required with ABS Traction Control System Present Platform Required with ABS Transmission Estimated Gear Powertrain Required Transmission Estimated Gear Validity Powertrain Required Transmission Overall Estimated Torque Ratio and Validity Powertrain Required Transmission Overall E
42、stimated Torque Ratio Validity Powertrain Required Vehicle Deceleration Engine Torque Minimum Extended Range Powertrain Required Vehicle Deceleration Engine Torque Minimum Extended Range Validity Powertrain Required Vehicle Speed Average Driven Powertrain Required Vehicle Speed Average Driven Source
43、 Powertrain Required Vehicle Speed Average Driven Validity Powertrain Required Vehicle Speed Average Non Driven Powertrain Required Vehicle Speed Average Non Driven Validity Powertrain Required Vehicle Speed Control System Type Platform Required Vehicle Stability Enhancement System Active Platform R
44、equired with ABS Vehicle Stability Enhancement System Present Platform Required Wheel Rotational Status Left Driven Platform Required with ABS Wheel Rotational Status Right Driven Platform Required with ABS Wheel Rotational Status Left Non Driven Platform Required with ABS Wheel Rotational Status Ri
45、ght Non Driven Platform Required with ABS -,-,- GMW8769 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 6 of 27 March 2006 Table 2: Cruise Control Calibrations Calibration Name Location Owner K_AccDisengageDelay Powertrain Platform K_AccLowSpeedD
46、isengage Powertrain Platform K_CruzCruiseSysType Powertrain Platform K_EffctvTireRollingRadius Powertrain Platform K_MetricTapIncrementEnable Powertrain Platform K_OpelCruiseControl Powertrain Platform K_VehicleCurbMass Powertrain Platform K_VehicleMassEst Powertrain Platform 3.3.3 Brake Pedal Apply
47、 Sensing. A brake pedal apply shall be communicated via two mechanisms. The first method is a GMLAN signal Brake Pedal Initial Travel Achieved Status. The second is a discrete input to the ECM, Brake Pedal Apply. There shall be no undetectable single point failure, which shall prevent detection of d
48、river application of the brake pedal. 3.3.3.1 Brake Pedal Apply. This input shall indicate whether the brake pedal is applied or not and is not necessarily indicative of the stop lamps being on. Specific details of the input are defined in GMW8773 Section 3 PPEI Brakes and Traction Control Subsystem
49、 Requirements. This input is in addition to a GMLAN signal Brake Pedal Initial Travel Achieved Status indicating brake pedal apply. On vehicles with discrete brake switches, the brake switch used to generate the discrete input shall be a separate switch from the one used to generate the GMLAN signal. In dual processor ETC subsystems the brake pedal apply discrete input shall be connected directly to both processors. This offers system protection from a single point