HYBRID POWERTRAIN TORQUE CONTROL

• US 20080220934A1
• Filed: 09/20/2007
• Published: 09/11/2008
• Est. Priority Date: 03/06/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Wozniak, Leonard G., Babcock, Douglas J.
• Granted Patent: US 7,704,185 B2
• Time in Patent Office: Days
• US Class Current: 477/5
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 10/14 Central differentials for dividing torque between front and rear axles
• 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 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method of regulating a torque output of each of an internal combustion engine (ICE) and an electric machine (EM) in a hybrid powertrain system includes determining a desired axle torque of the hybrid powertrain system and arbitrating the desired axle torque and a first plurality of torque requests in an engine control module (ECM) of the hybrid powertrain system to provide an arbitrated axle torque request. The method further includes arbitrating a torque request, which is based on the arbitrated axle torque request, and a second plurality of torque requests in a hybrid control module (HCM) to provide a final torque request, and generating ICE control signals and EM control signals based on the final torque request.

Claims

1. A method of regulating a torque output of each of an internal combustion engine (ICE) and an electric machine (EM) in a hybrid powertrain system, comprising:

determining a desired axle torque of the hybrid powertrain system;

arbitrating said desired axle torque and a first plurality of torque requests in an engine control module (ECM) of the hybrid powertrain system to provide an arbitrated axle torque request;

arbitrating a torque request, which is based on said arbitrated axle torque request, and a second plurality of torque requests in a hybrid control module (HCM) to provide a final torque request; and

generating ICE control signals and EM control signals based on said final torque request.

2. The method of claim 1, further comprising monitoring operating parameters of the hybrid powertrain system, wherein said desired axle torque is determined based on said operating parameters.

3. The method of claim 1, further comprising converting said arbitrated axle torque request into a propulsion torque request within said ECM, the ECM arbitrates the propulsion torque request and a first plurality of propulsion torque requests to provide the torque request.

4. The method of claim 1, further comprising determining a propulsion torque request within a transmission control module (TCM), wherein one of said second plurality of torque requests includes said propulsion torque request.

5. The method of claim 4, wherein said propulsion torque request is determined based on a gear ratio of a transmission of the hybrid powertrain system.

6. The method of claim 1, wherein said final torque request is a propulsion torque request, and the method further comprises splitting said propulsion torque request into an ICE torque request and an EM torque request.

7. The method of claim 6, wherein said ICE control signals are generated based on said ICE torque request and said EM control signals are generated based on said EM torque request.

8. The method of claim 1, wherein said HCM generates said EM control signals and said ECM generates said ICE control signals.

9. A torque control system for regulating a torque output of each of an internal combustion engine (ICE) and an electric machine (EM) in a hybrid powertrain system, comprising:

a first module that determines a desired axle torque of the hybrid powertrain system;

an engine control module (ECM) that arbitrates said desired axle torque and a first plurality of torque requests to provide an arbitrated axle torque request; and

a hybrid control module (HCM) that arbitrates a torque request, which is based on said arbitrated axle torque request, and a second plurality of torque requests to provide a final torque request;

wherein said ECM generates ICE control signals and said HCM generates EM control signals based on said final torque request.

10. The torque control system of claim 9, wherein said first module monitors operating parameters of the hybrid powertrain system, wherein said desired axle torque is determined based on said operating parameters.

11. The torque control system of claim 9, wherein said ECM converts said arbitrated axle torque request into a propulsion torque request, and the ECM arbitrates the propulsion torque request and a first plurality of propulsion torque requests to provide the torque request

12. The torque control system of claim 9, further comprising a transmission control module (TCM) that determines a propulsion torque request, wherein one of said second plurality of torque requests includes said propulsion torque request.

13. The torque control system of claim 12, wherein said propulsion torque request is determined based on a gear ratio of a transmission of the hybrid powertrain system.

14. The torque control system of claim 9, wherein said final torque request is a propulsion torque request, and the method further comprises splitting said propulsion torque request into an ICE torque request and an EM torque request.

15. The torque control system of claim 14, wherein said ICE control signals are generated based on said ICE torque request and said EM control signals are generated based on said EM torque request.

16. A method of regulating a torque output of each of an internal combustion engine (ICE) and an electric machine (EM) in a hybrid powertrain system, comprising:

determining a desired axle torque of the hybrid powertrain system based on operating parameters thereof;

arbitrating said desired axle torque and a first plurality of torque requests in an engine control module (ECM) of the hybrid powertrain system to provide an arbitrated axle torque request;

generating a first propulsion torque request based on said arbitrated axle torque request;

arbitrating said first propulsion torque request, a second propulsion torque request and a second plurality of torque requests in a hybrid control module (HCM) to provide a final torque request; and

generating ICE control signals and EM control signals based on said final torque request.

17. The method of claim 16, further comprising monitoring said operating parameters of the hybrid powertrain system, wherein said include an accelerator pedal position and a vehicle speed.

18. The method of claim 17, further comprising converting said arbitrated axle torque request into said first propulsion torque request based on an effective gear ratio of the hybrid powertrain system, wherein the ECM arbitrates the first propulsion torque request and a first plurality of propulsion torque requests to provide an arbitrated first propulsion torque request

19. The method of claim 17, further comprising determining said second propulsion torque request within a transmission control module (TCM).

20. The method of claim 16, wherein said final torque request is a propulsion torque request, and the method further comprises splitting said propulsion torque request into an ICE torque request and an EM torque request.

21. The method of claim 20, wherein said ICE control signals are generated based on said ICE torque request and said EM control signals are generated based on said EM torque request.

22. The method of claim 16, wherein said HCM generates said EM control signals and said ECM generates said ICE control signals.