PROCESSOR SECURITY DIAGNOSTICS FOR HYBRID VEHICLE ELECTRIC MOTOR CONTROL SYSTEM

• US 20090125171A1
• Filed: 09/29/2008
• Published: 05/14/2009
• Est. Priority Date: 11/08/2007
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: West, Stephen T., Wang, Wei D., Buur, Hanne
• Application Number:
  US12/240,259
• Publication Number:
  US 20090125171A1
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/083 Torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 50/02 Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A diagnostic system for a hybrid vehicle comprises a processor module and a motor control module. The processor module outputs a first seed value. The motor control module controls torque output by an electric motor of the hybrid vehicle and outputs a key value based on the first seed value. The processor module outputs a second seed value after receiving the key value, and the motor control module selectively diagnoses a fault in the processor module based on a comparison of the second seed value with the first seed value.

Claims

1. A diagnostic system for a hybrid vehicle, comprising:

a processor module that outputs a first seed value; and

a motor control module that controls torque output by an electric motor of said hybrid vehicle and that outputs a key value based on said first seed value,

wherein said processor module outputs a second seed value after receiving said key value, and

wherein said motor control module selectively diagnoses a fault in said processor module based on a comparison of said second seed value with said first seed value.

2. The diagnostic system of claim 1 wherein said motor control module selectively diagnoses said fault when said second seed value is equal to said first seed value.

3. The diagnostic system of claim 2 wherein said processor module sets said second seed value based on a comparison of said key value with an expected value.

4. The diagnostic system of claim 3 wherein said processor module sets said second seed value based on said first seed value when said key value is one of greater than and less than said expected value.

5. The diagnostic system of claim 3 wherein said processor module sets said second seed value based on a third value when said key value is equal to said expected value,

wherein said third value is one of greater than and less than said first seed value.

6. A diagnostic system for a hybrid vehicle, comprising:

a processor module that outputs a first seed value; and

a motor control module that controls torque output by an electric motor of said hybrid vehicle and that outputs a key value after receiving said first seed value,

wherein said processor module generates a signal having one of a first state and a second state based on a comparison of said key value with an expected value.

7. The diagnostic system of claim 6 wherein said motor control module selectively diagnoses a fault in said processor module based on said key value and said state of said signal.

8. The diagnostic system of claim 7 wherein said processor module generates said signal having said first state when said key value is equal to said expected value.

9. The diagnostic system of claim 8 wherein said motor control module selectively sets said key value based on an improper value that is not equal to said expected value and selectively diagnoses said fault when said processor module generates said signal having said first state.

10. The diagnostic system of claim 8 wherein said motor control module sets said key value based on said expected value and selectively diagnoses said fault when said processor module generates said signal having said second state.

11. The diagnostic system of claim 6 wherein said processor module selectively diagnoses a fault in said motor control module based on said comparison.

12. The diagnostic system of claim 11 wherein said processor module selectively diagnoses said fault when said key value is one of greater than and less than said expected value.

13. The diagnostic system of claim 11 wherein said processor module sets a second seed value based on said comparison and outputs said second seed value.

14. The diagnostic system of claim 13 wherein said processor module sets said second seed value based on said first seed value when said key value is one of greater than and less than said expected value.

15. A method for a hybrid vehicle, comprising:

transmitting a first seed value from a first module to a second module that controls torque output by an electric motor of said hybrid vehicle;

transmitting a key value determined based on said first seed value from said second module to said first module;

transmitting a second seed value from said first module to said second module after said first module receives said key value; and

selectively diagnosing a fault in said first module using said second module based on a comparison of said second seed value with said first seed value.

16. The method of claim 15 wherein said selectively diagnosing comprises selectively diagnosing said fault when said second seed value is equal to said first seed value.

17. The method of claim 16 further comprising setting said second seed value based on a comparison of said key value with an expected value.

18. The method of claim 17 wherein said setting said second seed value comprises setting said second seed value based on said first seed value when said key value is one of greater than and less than said expected value.

19. The method of claim 17 wherein said setting said second seed value comprises setting said second seed value based on a third value when said key value is equal to said expected value, wherein said third value is one of greater than and less than said first seed value.

20. A method for a hybrid vehicle, comprising:

transmitting a first seed value from a first module to a second module that controls torque output by an electric motor of said hybrid vehicle;

transmitting a key value from said second module to said first module after said second module receives said first seed value; and

generating a signal using said first module having one of a first state and a second state based on a comparison of said key value with an expected value.

21. The method of claim 20 further comprising selectively diagnosing a fault in said first module using said second module based on said key value and said state of said signal.

22. The method of claim 21 wherein said generating said signal comprises generating said signal having said first state when said key value is equal to said expected value.

23. The method of claim 22 further comprising:

selectively setting said key value based on an improper value that is not equal to said expected value; and

selectively diagnosing said fault when said signal having said first state is generated.

24. The method of claim 22 further comprising:

selectively setting said key value based on said expected value; and

selectively diagnosing said fault when said signal having said second state is generated.

25. The method of claim 20 further comprising selectively diagnosing a fault in said second module using said first module based on said comparison.

26. The method of claim 25 wherein said selectively diagnosing said fault comprises selectively diagnosing said fault when said key value is one of greater than and less than said expected value.

27. The method of claim 25 further comprising:

selectively setting a second seed value based on said comparison; and

transmitting said second seed value from said first module to said second module.

28. The method of claim 27 wherein said selectively setting said second seed value comprises setting said second seed value based on said first seed value when said key value is one of greater than and less than said expected value.