Model-based control for torque biasing system

• US 7,258,648 B2
• Filed: 08/31/2006
• Issued: 08/21/2007
• Est. Priority Date: 04/19/2004
• Status: Active Grant

• Current Assignee: Magna Powertrain Incorporated (Magna International Incorporated)
• Original Assignee: Magna Powertrain Incorporated (Magna International Incorporated)
• Inventors: Smith, William E., Bansbach, Eric A.
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US11/514,070
• Publication Number:
  US 20060293148A1
• Time in Patent Office: 355 Days
• Field of Search: 477/98, 477/76, 477/174, 477/175, 477/177, 477/179, 477/180, 701/67, 701/68, 318/433, 318/434, 318/471, 318/472, 318/432, 318/473
• US Class Current: 477/98
• CPC Class Codes: B60K 23/0808 for varying torque distribution between driven axles, e.g. by transfer clutch
• CPC Class Codes: F16D 2500/3165 Using the moment of inertia of a component as input for the control
• CPC Class Codes: F16D 2500/50287 Torque control
• CPC Class Codes: F16D 2500/70404 Force
• CPC Class Codes: F16D 2500/708 Mathematical model
• CPC Class Codes: F16D 2500/7082 of the clutch
• CPC Class Codes: F16D 48/06 Control by electric or electronic means, e.g. of fluid pressure

Abstract

A power transmission device equipped with a torque biasing system and control system for controlling the torque biasing system is operable to determine a torque command and calculate a torque error based on the torque command and a model-based torque. A control signal is generated based on the torque error and the torque biasing system is operated based on the control signal.

Claims

1. A power transmission device for a motor vehicle, comprising:

a torque biasing system having a clutch pack disposed between first and second rotary members;

a motor operable to manipulate engagement of said clutch pack based on a control signal, said motor having a position sensor operable to generate a position signal, a temperature sensor operable to generate a temperature signal and a current sensor operable to generate a current signal, and

a control system operable to generate said control signal based on a torque command and a calculated torque, wherein said calculated torque is determined based on a model of said torque biasing system, and wherein said calculated torque is determined based on at least one of said position signal, said temperature signal and said current signal.

2. The power transmission device of claim 1 wherein said torque biasing system further includes a clutch operator mechanism driven by said motor for imparting a clutch engagement force on said clutch pack.

3. The power transmission device of claim 1 wherein said control signal is based on a difference between said torque command and said calculated torque.

4. The power transmission device of claim 1 wherein said model of said torque biasing system includes a motor module, a clutch operator module and a clutch pack module.

5. The power transmission device of claim 1 wherein said control system includes a controller, said controller comprising:

a motor control module generating a motor control signal;

a motor module generating a calculated clutch operator position signal based on said motor control signal;

a clutch operator module generating a calculated clutch interconnection signal based on said calculated clutch operator position signal; and

a clutch module generating a calculated torque signal based on said calculated clutch interconnection signal;

wherein said motor control signal is based on said calculated torque signal.

6. The power transmission device of claim 5 wherein said calculated clutch operator position signal is generated by said motor module based on motor data including at least one of current to torque conversion factor data, back EMF constant data, brake-on drag data, brake-off drag data, viscous drag data, coil resistance data, inertia data, and gear ratio data.

7. The power transmission device of claim 5 wherein said calculated clutch operator position signal is generated by said motor module based on at least one of motor position data, motor temperature data, and motor electrical current data.

8. The power transmission device of claim 5 wherein said calculated clutch interconnection signal is generated by said clutch operator module based on clutch operator data including at least one of spring rate data, efficiency data, drag factor data, viscous damper drag factor data, position ratio data, and inertia data.

9. The power transmission device of claim 5 wherein said calculated torque signal is generated by said clutch module based on at least one of negative clutch force data, nominal kiss point data, kiss point correction data, number of clutch plates data, effective clutch plate radius data, clutch geometry data, cutch temperature data, and wheel slip data.

10. The power transmission device of claim 5 wherein said motor control module receives a torque command signal and generates said motor control signal based on a difference between said torque command signal and said calculated torque signal.

11. A power transmission device for a motor vehicle, comprising:

a torque biasing system having a clutch pack disposed between first and second rotary members;

a motor operable to manipulate engagement of said clutch pack based on a control signal; and

a control module operable to generate said control signal based on a torque command and a calculated torque, wherein said calculated torque is determined based on a model of said torque biasing system, and wherein a temperature sensor associated with said clutch pack generates a temperature signal that is used by said control module to determine said calculated torque.

12. The power transmission device of claim 11 wherein said torque biasing system further includes a clutch operator mechanism driven by said motor for imparting a clutch engagement force on said clutch pack.

13. The power transmission device of claim 11 wherein said control signal is based on a difference between said torque command and said calculated torque.

14. The power transmission device of claim 11 wherein said model of said torque biasing system includes a motor module, a clutch operator module and a clutch pack module.

15. The power transmission device of claim 11 wherein said control system includes a controller, said controller comprising:

a motor control module generating a motor control signal;

a motor module generating a calculated clutch operator position signal based on said motor control signal;

a clutch operator module generating a calculated clutch interconnection signal based on said calculated clutch operator position signal; and

a clutch module generating a calculated torque signal based on said calculated clutch interconnection signal;

wherein said motor control signal is based on said calculated torque signal.

16. The power transmission device of claim 15 wherein said motor control module receives a torque command signal and generates said motor control signal based on a difference between said torque command signal and said calculated torque signal.

17. A power transmission device for a motor vehicle, comprising:

a torque biasing system having a clutch pack disposed between first and second rotary members;

a motor operable to manipulate engagement of said clutch pack based on a control signal; and

a control module operable to generate said control signal based on a torque command and a calculated torque, wherein said calculated torque is based on a calculated interconnection position of said clutch pack, and wherein said interconnection position is based on a model of said torque biasing system.

18. The power transmission device of claim 17 wherein said torque biasing system further includes a clutch operator mechanism driven by said motor for imparting a clutch engagement force on said clutch pack.

19. The power transmission device of claim 17 wherein said control signal is based on a difference between said torque command and said calculated torque.

20. The power transmission device of claim 17 wherein said model of said torque biasing system includes a motor module, a clutch operator module and a clutch pack module.

21. The power transmission device of claim 17 wherein said control system includes a controller, said controller comprising:

a motor control module generating a motor control signal;

a motor module generating a calculated clutch operator position signal based on said motor control signal;

a clutch operator module generating a calculated clutch interconnection signal based on said calculated clutch operator position signal; and

a clutch module generating a calculated torque signal based on said calculated clutch interconnection signal;

wherein said motor control signal is based on said calculated torque signal.

22. The power transmission device of claim 21 wherein said calculated clutch operator position signal is generated by said motor module based on motor data including at least one of current to torque conversion factor data, back EMF constant data, brake-on drag data, brake-off drag data, viscous drag data, coil resistance data, inertia data, and gear ratio data.

23. The power transmission device of claim 21 wherein said calculated clutch operator position signal is generated by said motor module based on at least one of motor position data, motor temperature data, and motor electrical current data.

24. The power transmission device of claim 21 wherein said calculated clutch interconnection signal is generated by said clutch operator module based on clutch operator data including at least one of spring rate data, efficiency data, drag factor data, viscous damper drag factor data, position ratio data, and inertia data.

25. The power transmission device of claim 21 wherein said calculated torque signal is generated by said clutch module based on at least one of negative clutch force data, nominal kiss point data, kiss point correction data, number of clutch plates data, effective clutch plate radius data, clutch geometry data, clutch temperature data, and wheel slip data.

26. The power transmission device of claim 21 wherein said motor control module receives a torque command signal and generates said motor control signal based on a difference between said torque command signal and said calculated torque signal.

27. A power transmission device for a motor vehicle, comprising:

a torque biasing system having a clutch pack disposed between first and second rotary members;

a motor operable to manipulate engagement of said clutch pack based on a control signal; and

a control module operable to generate said control signal based on a torque command and a calculated torque, wherein said calculated torque is determined based on a model of said torque biasing system which includes a motor module, a clutch operator module and a clutch pack module.

28. The power transmission device of claim 27 wherein said torque biasing system further includes a clutch operator mechanism driven by said motor for imparting a clutch engagement force on said clutch pack.

29. The power transmission device of claim 27 wherein said control signal is based on a difference between said torque command and said calculated torque.