PREDICTED AND IMMEDIATE OUTPUT TORQUE CONTROL ARCHITECTURE FOR A HYBRID POWERTRAIN SYSTEM

• US 20090118929A1
• Filed: 10/10/2008
• Published: 05/07/2009
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: BMW AG (Bayerische Motoren Werke AG), Daimler AG (Mercedes-Benz Group AG), GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust), Chrysler LLC (Stellantis NV)
• Inventors: Heap, Anthony H., Cawthorne, William R.
• Granted Patent: US 8,121,767 B2
• Time in Patent Office: Days
• US Class Current: 701/54
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/423 Torque
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2050/0005 Processor details or data handling, e.g. memory registers or chip architecture
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: B60W 50/04 : Monitoring the functioning of the control system
• CPC Class Codes: F16H 2037/0866 : Power split variators with distributing differentials, with the output of the CVT connected or connectable to the output shaft
• CPC Class Codes: F16H 2037/102 : the input or output shaft of the transmission is connected or connectable to two or more differentials
• CPC Class Codes: F16H 2037/104 : Power split variators with one end of the CVT connected or connectable to two or more differentials
• CPC Class Codes: F16H 2037/106 : with switching means to provide two variator modes or ranges
• CPC Class Codes: F16H 3/728 : with means to change ratio in the mechanical gearing
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y10S 903/91 : Orbital, e.g. planetary gears
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

A method for controlling torque in a hybrid powertrain system to selectively transfer mechanical power to an output member includes monitoring operator inputs to an accelerator pedal and to a brake pedal. An immediate accelerator output torque request, a predicted accelerator output torque request, an immediate brake output torque request, a predicted brake output torque request, and an axle torque response type are determined. An output torque command to the output member of the transmission is determined based upon the immediate accelerator output torque request and the immediate brake output torque request.

Claims

1. Method for controlling a powertrain system including an engine and first and second electric machines mechanically coupled to an electro-mechanical transmission to transfer power to an output member, comprising:

monitoring operator inputs to an accelerator pedal and to a brake pedal;

determining an immediate accelerator output torque request, a predicted accelerator output torque request, an immediate brake output torque request, a predicted brake output torque request, and an axle torque response type based upon the operator inputs to the accelerator pedal and the brake pedal;

determining an output torque command for controlling the first and second electric machines based upon the immediate accelerator output torque request, the immediate brake output torque request and the axle torque response type; and

controlling the first and second electric machines to transfer an output torque to the output member based upon the output torque command.

2. The method of claim 1, further comprising commanding the engine to transfer an input torque to the electro-mechanical transmission based upon the immediate accelerator output torque request, the predicted accelerator output torque request, the immediate brake output torque request, the predicted brake output torque request, and the axle torque response type.

3. The method of claim 1, comprising determining the immediate accelerator output torque request based upon a presently occurring operator input to the accelerator pedal.

4. The method of claim 1, wherein the predicted accelerator output torque request comprises a preferred output torque at the output member to effect acceleration.

5. The method of claim 1, comprising determining the immediate brake output torque request based upon a presently occurring operator input to the brake pedal and a friction braking torque.

6. The method of claim 5, wherein the immediate brake output torque request comprises the output torque to the output member transferred to a driveline to effect deceleration.

7. The method of claim 1, wherein the predicted brake output torque request comprises a preferred output torque at the output member during deceleration.

8. The method of claim 1, wherein the axle torque response type comprises one of an inactive state and an active state.

9. Method for controlling a powertrain system including an engine and an electric machine mechanically coupled to an electro-mechanical transmission to transfer power to an output member, comprising:

monitoring operator inputs to an accelerator pedal and to a brake pedal;

determining an immediate accelerator output torque request, a predicted accelerator output torque request, an immediate brake output torque request, a predicted brake output torque request and an axle torque response type based upon the operator inputs to the accelerator pedal and the brake pedal;

determining an output torque command for controlling the electric machine based upon the immediate accelerator output torque request, the immediate brake output torque request and the axle torque response type; and

controlling the electric machine to transfer an output torque to the output member based upon the output torque command.

10. The method of claim 9, further comprising commanding the engine to transfer an input torque to the electro-mechanical transmission based upon the immediate accelerator output torque request, the predicted accelerator output torque request, the immediate brake output torque request, the predicted brake output torque request, and the axle torque response type.

11. The method of claim 10, further comprising determining the immediate accelerator output torque request based upon a presently occurring operator input to the accelerator pedal.

12. The method of claim 11, wherein the predicted accelerator output torque request comprises a preferred output torque at the output member during acceleration.

13. The method of claim 11, further comprising determining the immediate brake output torque request based upon a presently occurring operator input to the brake pedal and a friction braking torque.

14. The method of claim 13, wherein the predicted brake output torque request comprises a preferred output torque at the output member during deceleration.

15. The method of claim 9, further comprising the axle torque response type comprising one of an inactive state and an active state.

16. A method for operating a powertrain system including an engine and a plurality of electric machines mechanically coupled to a transmission operative in one of a plurality of operating range states to transfer power to an output member, comprising:

monitoring operator inputs to an accelerator pedal and to a brake pedal;

monitoring operation of the engine, transmission, and the electric machines;

determining an immediate accelerator output torque request, a predicted accelerator output torque request, an immediate brake output torque request, a predicted brake output torque request and an axle torque response type based upon the operator inputs to the accelerator pedal and the brake pedal; and

determining an output torque command for controlling the electric machines based upon the immediate accelerator output torque request, the immediate brake output torque request and the axle torque response type.

17. The method of claim 16, further comprising commanding the engine to transfer power to the transmission based upon the immediate accelerator output torque request, the predicted accelerator output torque request, the immediate brake output torque request, the predicted brake output torque request, and the axle torque response type.

18. The method of claim 17, comprising controlling the electric machines to transfer power to the transmission to the output member based upon the output torque command.