Granted Patent B2

US 7,090,613 · App. 10/846,153 · Granted Aug 15, 2006

Abstract

Claims (39)

1. A method of operating a vehicle powertrain system comprising an electric motor and transmission, the electric motor operably and selectively coupled to the transmission and adapted to provide an output torque contribution thereto, the electric motor having a predetermined maximum motor output torque and a predetermined minimum motor output torque which are used to determine a range of permissible control points for at least one transmission control parameter, comprising:

establishing a motor torque reserve by performing at least one of decreasing the predetermined maximum motor output torque to a maximum reserved motor output torque and increasing the predetermined minimum motor output torque to a minimum reserved motor output torque, wherein the maximum reserved motor output torque and the minimum reserved motor output torque are used in place of the predetermined maximum motor output torque and the predetermined minimum motor output torque, respectively, to determine the range of permissible control points for the at least one transmission control parameter.

2. The method of claim 1 , wherein the motor torque reserve is a static torque reserve, and wherein a static reserve value is used to perform the at least one of decreasing the predetermined maximum motor output torque to a maximum reserved motor output torque and increasing the predetermined minimum motor output torque to a minimum reserved motor output torque.

3. The method of claim 2 , wherein the static torque reserve is determined by decreasing the predetermined maximum motor output torque by the static reserve value to establish the maximum reserved motor output torque and increasing the predetermined minimum output torque by the static reserve value to establish the minimum reserved motor output torque.

4. The method of claim 3 , wherein the static reserve value comprises a maximum static reserve value for decreasing the predetermined maximum output torque and a minimum static reserve value for increasing the predetermined minimum output torque, wherein the maximum static reserve value and the minimum static reserve value are different values.

5. The method of claim 1 , wherein the motor torque reserve is a dynamic torque reserve, and wherein a dynamic reserve value is used to determine the dynamic torque reserve.

6. The method of claim 5 , wherein the dynamic torque reserve is a predictive dynamic torque reserve, and wherein the dynamic reserve value is a predictive reserve value.

7. The method of claim 5 , wherein the dynamic torque reserve is a reactive dynamic torque reserve, and wherein the dynamic torque reserve value is a reactive reserve value.

8. The method of claim 5 , wherein the dynamic torque reserve comprises a predictive torque reserve and a reactive torque reserve, and wherein the dynamic torque reserve value comprises a predictive reserve value and a reactive reserve value.

9. The method of claim 6 , wherein the predictive reserve value is calculated as a function of a predicted motor torque event.

10. The method of claim 9 , wherein the predicted motor torque event is a transmission shift.

11. The method of claim 10 , wherein the predictive reserve value is generally larger for points of operation nearer in time to the predicted transmission shift and generally smaller for points of operation farther in time from the predicted transmission shift.

12. The method of claim 10 , wherein the predictive reserve value is calculated as a function of at least one transmission dynamic parameter.

13. The method of claim 12 , wherein the at least one transmission dynamic parameter comprises a desired input acceleration and an output acceleration.

14. The method of claim 13 , wherein the predictive reserve value is filtered by application of a filter.

15. The method of claim 14 , wherein the filter comprises a rate limiter.

16. The method of claim 7 , wherein the reactive reserve value is calculated as a function of at least one transmission dynamic parameter.

17. The method of claim 16 , wherein the transmission dynamic parameter comprises an input speed error.

18. The method of claim 17 , wherein the reactive reserve value is generally larger for larger values of the input speed error and smaller for smaller values of the input speed error.

19. The method of claim 16 , wherein the reactive reserve value is filtered by application of a filter.

20. The method of claim 19 . wherein the filter comprises a rate limiter.

21. The method of claim 1 , wherein the motor torque reserve comprises a static reserve value and a dynamic reserve value, and wherein the static reserve value and the dynamic reserve value are used to perform the at least one of decreasing the predetermined maximum motor output torque to a maximum reserved motor output torque and increasing the predetermined minimum motor output torque to a minimum reserved motor output torque.

22. The method of claim 1 , wherein the motor torque reserve is determined by decreasing the predetermined maximum motor output torque by the static and dynamic reserve values to establish the maximum reserved motor output torque and increasing the predetermined minimum output torque by the static and dynamic reserve values to establish the minimum reserved motor output torque.

23. The method of claim 2 , wherein the static reserve value comprises a maximum static reserve value for decreasing the predetermined maximum output torque and a minimum static reserve value for increasing the predetermined minimum output torque. wherein the maximum static reserve value and the minimum static reserve value are different values.

24. The method of claim 21 , wherein the dynamic reserve value is a predictive reserve value.

25. The method of claim 21 , wherein the dynamic reserve value is a reactive reserve value.

26. The method of claim 21 , wherein the dynamic reserve value comprises a predictive reserve value and a reactive reserve value.

27. The method of claim 24 , wherein the predictive reserve value is calculated as a function of a predicted motor torque event.

28. The method of claim 27 , wherein the predicted motor torque event is a transmission shift.

29. The method of claim 28 , wherein the predictive reserve value is generally larger for points of operation nearer in time to the predicted transmission shift and generally smaller for points of operation farther in time from the predicted transmission shift.

30. The method of claim 28 , wherein the predictive reserve value is calculated as a function of at least one transmission dynamic parameter.

31. The method of claim 30 , wherein the at least one transmission dynamic parameter comprises a desired input acceleration and an output acceleration.

32. The method of claim 31 , wherein the predictive reserve value is filtered by application of a filter.

33. The method of claim 32 , wherein the filter comprises a rate limiter.

34. The method of claim 25 , wherein the reactive reserve value is calculated as a function of at least one transmission dynamic parameter.

35. The method of claim 34 , wherein the transmission dynamic parameter comprises an input speed error.

36. The method of claim 35 , wherein the reactive reserve value is generally larger for larger values of the input speed error and smaller for smaller values of the input speed error.

37. The method of claim 34 , wherein the reactive reserve value is filtered by application of a filter.

38. The method of claim 37 , wherein the filter comprises a rate limiter.

Assignments (13)