METHOD FOR CONTROLLING A POWERTRAIN SYSTEM BASED ON PENALTY COSTS

• US 20090118923A1
• Filed: 09/23/2008
• Published: 05/07/2009
• Est. Priority Date: 11/04/2007
• 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., Kim, Kee Yong
• Granted Patent: US 8,897,975 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 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/04 including control of propulsion units
• 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 10/115 with planetary gears
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• 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 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/0666 Engine power
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 : Accelerator pedal position
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• CPC Class Codes: B60W 2710/027 : Clutch torque
• CPC Class Codes: B60W 2710/0644 : Engine speed
• CPC Class Codes: B60W 2710/0666 : Engine torque
• CPC Class Codes: B60W 2710/0677 : Engine power
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 30/188 : Controlling power parameters of the driveline, e.g. determining the required power
• 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 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/84 : Data processing systems or methods, management, administration

Abstract

A method for controlling a powertrain system includes monitoring an operator torque request, selecting a candidate powertrain system operating point, and determining a preferred engine torque range, a preferred torque machine torque range, and a preferred energy storage device output power range. The method further includes determining an engine torque, a torque machine torque, and an energy storage device output power based upon the operator torque request and the candidate powertrain system operating point. Power costs for operating the powertrain at the candidate powertrain system operating point are determined based on the determined engine torque, the determined torque machine torque, and the determined energy storage device output power range. Penalty costs are determined relative to the preferred engine torque range, the preferred torque machine torque range, and the preferred energy storage device output power range for operating the powertrain at the candidate powertrain system operating point. And, an operating cost for operating the powertrain at the candidate powertrain system operating point is determined based on the power costs and the penalty costs

Claims

1. Method for controlling a powertrain system comprising an engine, a torque machine, a transmission device and an energy storage device, the transmission device configured to transfer power among the engine, the torque machine and an output member to generate an output torque, the method comprising:

monitoring an operator torque request;

selecting a candidate powertrain system operating point;

determining a preferred engine torque range, a preferred torque machine torque range, and a preferred energy storage device output power range;

determining an engine torque, a torque machine torque, and a energy storage device output power based upon the operator torque request and the candidate powertrain system operating point;

determining power costs for operating the powertrain at the candidate powertrain system operating point based on the determined engine torque, the determined torque machine torque, and the determined energy storage device output power range;

determining penalty costs relative to the preferred engine torque range, the preferred torque machine torque range, and the preferred energy storage device output power range for operating the powertrain at the candidate powertrain system operating point; and

determining an operating cost for operating the powertrain at the candidate powertrain system operating point based on the power costs and the penalty costs.

2. The method of claim 1, wherein the candidate powertrain system operating point comprises at least one of a candidate engine operating point and a candidate transmission operating range state.

3. The method of claim 2, wherein the candidate engine operating point comprises at least one of a candidate engine state, a candidate engine speed, a candidate engine torque, and a candidate engine power.

4. The method of claim 3, wherein the candidate engine operating point comprises an engine torque when the transmission device is in a fixed-gear mode.

5. The method of claim 3, wherein the candidate engine operating point comprises one of an engine power and an engine speed when the transmission device is in a continuously variable mode.

6. The method of claim 3, wherein the candidate engine state comprises at least one of a fueled engine state, a fuel-cutoff engine state, an all-cylinder engine state, and a cylinder deactivation engine state.

7. The method of claim 2, wherein the candidate transmission operating range state comprises one of a fixed gear mode, a continuously variable mode, and an engine off mode.

8. The method of claim 1, wherein determining the penalty cost relative to the preferred engine torque range comprises determining the penalty cost based upon a proximity of the determined engine torque to the preferred engine torque range.

9. The method of claim 1, wherein determining the penalty cost relative to the preferred torque machine torque range comprises determining the penalty cost based upon a proximity of the determined torque machine torque to the preferred torque machine torque range.

10. The method of claim 1, wherein determining the penalty cost relative to the preferred energy storage device output power range comprises determining the penalty cost based upon a proximity of the determined energy storage device output power to the preferred energy storage device output power range.

11. The method of claim 1, wherein determining the preferred engine torque range and the preferred torque machine torque range comprises determining the preferred engine torque range and the preferred torque machine torque range based upon the candidate powertrain system operating point.

12. Method for controlling a powertrain system including a transmission device, an engine, and a torque machine coupled to an energy storage device, the transmission device including torque transfer clutches, the transmission device configured to transfer power among an output member, the engine and the torque machine through selective application of the torque transfer clutches, the method comprising:

monitoring an operator torque request;

selecting a candidate powertrain system operating point;

determining a preferred engine torque range, a preferred torque machine torque range, a preferred energy storage device output power range, and a preferred transmission device clutch torque range;

determining an engine torque, a torque machine torque, an energy storage device output power, and a transmission device clutch torque based upon the operator torque request and the candidate powertrain system operating point;

determining power costs for operating the engine at the determined engine torque, the torque machine at the determined torque machine torque, the energy storage device at the determined energy storage device output power, and the transmission device at the determined clutch torque;

determining penalty costs associated with operating the powertrain at the candidate system operating point based on operating the engine outside the preferred engine torque range, operating the electric machine outside the preferred electric machine range, operating the preferred energy storage device outside the preferred energy storage device output power range, and operating the transmission device outside the preferred transmission device clutch torque range; and

determining an operating cost for operating the powertrain at the powertrain system operating point based on the power costs and the penalty costs.

13. The method of claim 12 wherein determining the penalty cost relative to the preferred energy storage device output power range comprises determining the penalty cost based upon a proximity of the determined transmission device clutch torque to the preferred transmission device clutch torque range.

14. The method of claim 12, wherein determining the preferred transmission device clutch torque limits range comprises determining the preferred transmission device clutch torque limits range based on the candidate powertrain system operating point.

15. The method of claim 12, wherein the candidate powertrain system operating point comprises at least one of a candidate engine operating point and a candidate transmission operating range state.

16. The method of claim 15, wherein the candidate engine operating point comprises at least one of a candidate engine state, a candidate engine speed, a candidate engine torque, and a candidate engine power.

17. The method of claim 16, wherein the candidate engine state comprises at least one of a fueled engine state, a fuel-cutoff engine state, an all-cylinder engine state, and a cylinder deactivation engine state.

18. The method of claim 15, wherein the candidate transmission operating range state comprises one of a fixed gear mode, a continuously variable mode, and an engine off mode.

19. Method for controlling a powertrain system comprising an engine, a torque machine, a transmission device and an energy storage device, the transmission device configured to transfer power among the engine, the torque machine and an output member to generate an output torque, the method comprising:

monitoring an operator torque request;

selecting a candidate engine operating point;

determining a preferred engine torque range, a preferred torque machine torque range, and a preferred energy storage device output power range;

determining an engine torque, a torque machine torque, and an energy storage device output power based upon the operator torque request and the candidate engine operating point;

determining power costs for operating the engine at the determined engine torque, the torque machine at the determined torque machine torque, and the energy storage device at the determined energy storage device output power;

determining penalty costs for operating the powertrain system outside the preferred engine torque range, the preferred torque machine torque range, and the preferred energy storage device output power range; and

determining an operating cost for operating the powertrain at the engine operating point based on the power costs and the penalty costs.

20. The method of claim 19, wherein the candidate engine operating point comprises at least one of a candidate engine state, a candidate engine speed, a candidate engine torque, and a candidate engine power.