GMW-8768-2006.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Electrical/Electronic PPEI 3.7 GMW8768 Platform to Powertrain Electrical Interface (PPEI) Specification Vehicle Theft Deterrent Subsystem Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North Amer
2、ican Engineering Standards Page 1 of 6 1 Introduction This standard defines the Vehicle Theft Deterrent electrical interface requirements from Platform to Powertrain. 1.1 Applicability. The GMW8762 PPEI (Platform to Powertrain Electrical Interface) Standard Specification includes: General Informatio
3、n, 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 Engi
4、ne 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 Emis
5、sions 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 su
6、bsystem 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 a
7、pproved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None. 2.2 GM Standards/Specifications. GMW3001 GMW8771 GMW3059 GMW8772 GMW7349 GMW8773 GMW8762 GMW8774 GMW8763 GMW8775 GMW8764 GMW8776 GMW8765 GMW8777 GMW8766 GMW8778 GMW8767 GMW8779 GMW8769 GMW8780 G
8、MW8770 GMW8781 2.3 Additional References. None. 3 Subsystem Requirements Vehicle Theft Deterrent (VTD) is a Platform owned system that interfaces with Powertrain. This system is also known as a Vehicle Immobilizer. The interface requirements for the Vehicle Immobilizer system are detailed in the “Pl
9、atform - Powertrain Immobilizer System Interface and Requirements” (GMW7349). The following description describes the general operation of the Immobilizer system. Detailed requirements are found in GMW7349. Platform and Powertrain implementations shall conform to the operational and interface requir
10、ements outlined in GMW7349. GMW8768 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 6 March 2006 Normal Starting Procedure: 1. Platform sends a start request, along with a vehicle specific fixed code start enable password. 2. Powertrain comp
11、ares the start enable password with the vehicle specific password. If the password does not match the expected value the Powertrain does nothing. If the passwords match, the process continues. 3. Powertrain generates a random challenge and transfers it to the platform via the serial datalink. Powert
12、rain also begins cranking the engine (assuming all other starting interlock criteria are met). Powertrain will allow the engine to run until a security determination is made (see Step 5 below) or the customer requests deactivation of the engine. 4. Platform computes a response to the powertrain chal
13、lenge based on the procedure described below and transfers it to Powertrain via the serial datalink. 5. Powertrain computes a reference response to its challenge (computed in the same manner as Platforms response), and compares this reference response to the response received from Platform. If the P
14、latform response does not match, Powertrain deactivates the engine (by disabling fuel and spark). If the Platform response does match the reference response Powertrain releases the engine for normal operation for the duration of the driving cycle. The release determination made in Step 5 above is su
15、bject to some additional criteria. As is obvious from the above description, Powertrain allows initial operation of the engine until a security decision is made. In the event that the response computed by platform in Step 4 is not received by Powertrain in a timely manner (referred to as the “Pre-Re
16、lease Period”) the Powertrain shall deactivate the engine as described above. The Pre-Release period is a function of both time and engine speed refer to GMW7349 for details. The Challenge/Response algorithm described in Steps 3 5 above consists of the computation of a cryptographic authenticator (t
17、he response). The response is a function of both the challenge (randomly generated by Powertrain) and secret information shared between Powertrain and Platform and not exchanged during normal communication (the secret key). The cryptographic algorithm is designed to make it difficult for a potential
18、 thief to estimate or compute the secret key based on watching a series of previous challenge/response operations. This makes it difficult for a potential thief to be able to respond properly to future challenges unless they have passed the security checks in the platform side of the immobilizer sys
19、tem. Refer to GMW7349 for details. Cryptographic Algorithm Response Secret Key Challenge The Powertrain and Platform electronics involved in the immobilization system exchange status information that allows the Platform to determine if the Powertrain has rejected a start request (or subsequent chall
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