Method for controlling a powertrain system based on penalty costs

• US 8,897,975 B2
• Filed: 09/23/2008
• Issued: 11/25/2014
• 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: Bayerische Motoren Werke AG, GM Global Technology Operations LLC (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Inventors: Heap, Anthony H., Kim, Kee Yong
• Primary Examiner(s): Algahaim, Helal A
• Assistant Examiner(s): Nguyen, Nga X
• Application Number:
  US12/236,444
• Publication Number:
  US 20090118923A1
• Time in Patent Office: 2,254 Days
• Field of Search: 701/22, 701/84, 701/87, 701/90, 701 51- 54, 180/65.1, 180 65265- 65285, 180/65.29, 477/3, 477/7, 477/15, 477/34, 903/903, 903/945
• 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 from a minimum engine torque to a maximum engine torque, a preferred torque machine torque range from a minimum torque machine torque to a maximum torque machine torque, and a preferred energy storage device output power range from a minimum energy storage device output power to a maximum energy storage device output power;

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;

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 associated with violating 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 comprising

determining an engine torque penalty cost based on a proximity of the engine torque to the violated one of the minimum engine torque and the maximum engine torque,

determining a torque machine torque penalty cost based on a proximity of the torque machine torque to the violated one of the minimum torque machine torque and the maximum torque machine torque, and

if the energy storage device output power is outside the preferred energy storage device output power range from the minimum energy storage device output power to the maximum energy storage device output power, determining an energy storage device output power penalty cost based on a proximity of the energy storage device output power to the violated one of the minimum energy storage device output power and the maximum energy storage device output power; 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, the penalty costs determined by summing the determined engine torque penalty cost, the determined torque machine torque penalty cost and the determined energy storage device output power penalty cost.

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.