METHOD FOR DETERMINING A POWER CONSTRAINT FOR CONTROLLING A POWERTRAIN SYSTEM

• US 20090112385A1
• Filed: 10/15/2008
• Published: 04/30/2009
• Est. Priority Date: 10/29/2007
• 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), GM Global Technology Operations Incorporated (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler LLC (Stellantis NV)
• Inventors: MCCONNELL, JASON J., BRUNSSEN, WILFRIED, HEAP, ANTHONY H.
• Granted Patent: US 8,095,254 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• 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: 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 20/30 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 2050/0052 Filtering, filters
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• 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: Y02T 10/62 Hybrid vehicles

Abstract

A method for controlling a powertrain system includes monitoring operating conditions of an engine, a transmission device, and an energy storage device. The method further includes determining a first power constraint, filtering the first power constraint utilizing a first filter response time when the first power constraint changes in a first direction, and filtering the first power constraint utilizing a second filter response time when the first power constraint changes in a second direction.

Claims

1. Method for controlling a powertrain system, the powertrain system including a transmission device, an engine, and a second torque generating device connected to an energy storage device, the transmission device operative to transfer power between an output member, the engine, and the second torque generating device, the method comprising:

monitoring operating conditions of the engine, the transmission device, and the energy storage device;

determining a first power constraint and a second power constraint for transferring power within the powertrain system based on the operating conditions;

filtering the first power constraint utilizing a first filter response time when the first power constraint changes in a first direction; and

filtering the first power constraint utilizing a second filter response time when the first power constraint changes in a second direction.

2. The method of claim 1, wherein the first and second power constraints comprise torque constraints for constraining output torque within the powertrain system.

3. The method of claim 1, further comprising:

determining a minimum power constraint and a maximum power constraint for transferring power within the powertrain system based on the operating conditions;

filtering the maximum power constraint utilizing a first filter response time when the maximum power constraint is decreasing; and

filtering the maximum power constraint utilizing a second filter response time when the maximum power constraint is increasing,

wherein the second filter response time has a greater time lag than the first filter response time.

4. The method of claim 1, further comprising:

determining a minimum power constraint and a maximum power constraint for transferring power within the powertrain system based on the operating conditions;

filtering the minimum power constraint utilizing a first filter response time when the minimum power constraint is increasing; and

filtering the minimum power constraint utilizing a second filter response time when the minimum power constraint is decreasing,

wherein the second filter response time has a greater time lag than the first filter response time.

5. The method of claim 4, further comprising:

filtering the maximum power constraint utilizing a third filter response time when the maximum power constraint is increasing; and

filtering the maximum power constraint utilizing a fourth filter response time when the maximum power constraint is decreasing,

wherein the fourth filter response time has a greater time lag than the third filter response time.

6. The method of claim 5, further comprising setting the maximum power constraint to the minimum power constraint when the maximum and minimum power constraints are decreasing and when the maximum power constraint meets the minimum power constraint.

7. The method of claim 5, further comprising setting the minimum power constraint to the maximum power constraint when the maximum and minimum power constraints are increasing and when the minimum power constraint meets the maximum power constraint.

8. The method of claim 1, further comprising:

determining first and second input torque constraints for constraining the input torque from the engine to the transmission device;

filtering the first input torque constraint utilizing a first filter response time when the input torque constraints change in a first direction; and

filtering the first input torque constraint utilizing a second filter response time when the input torque constraints change in a second direction.

9. The method of claim 8, further comprising:

determining an operator torque request; and

determining the first and the second input torque constraints based on the operating conditions and the operator torque request.

10. The method of claim 1, further comprising:

determining first and second output torque constraints for constraining output torque from the transmission device to the output member;

filtering the first output torque constraint utilizing a first filter response time when the output torque constraints change in a first direction; and

filtering the second output torque constraint utilizing a second filter response time when the output torque constraints change in a second direction.

11. The method of claim 1, further comprising controlling power transferred within powertrain system between the first and the second power constraints.

12. The method of claim 1, further comprising:

monitoring operating conditions of the energy storage device comprising an output power of the energy storage device; and

determining a first power constraint and a second power constraint for transferring power within the powertrain system based on the output power of the energy storage device.

13. Method for controlling a powertrain system, the powertrain system including a transmission device, an engine, and a second torque generating device connected to an energy storage device, the transmission device operative to transfer power between an output member, the engine, and the second torque generating device, the method comprising:

monitoring operating conditions of the engine, the transmission device, and the energy storage device;

determining a power constraint for transferring power within the powertrain system based on the operating conditions;

filtering the power constraint utilizing a first filter response time when the power constraint changes in a first direction; and

filtering the power constraint utilizing a second filter response time when the power constraint changes in a second direction.

14. The method of claim 13, further comprising:

determining a first input torque constraint and a second input torque constraint for constraining input torque from the engine to the transmission device based on the operating conditions;

filtering the first input torque constraint utilizing a first filter response time when the first input torque constraint changes in a first direction; and

filtering the first input torque constraint utilizing a second filter response time when the first input torque constraints changes in a second direction.

15. The method of claim 14, further comprising:

determining an operator torque request; and

determining the first and second input torque constraints based on the operating conditions and the operator torque request.

16. The method of claim 13, further comprising:

determining first and second output torque constraints for constraining output torque from the transmission to the output member based on the operating conditions;

filtering the first output torque constraint utilizing a first filter response time when the first output torque constraint changes in a first direction; and

filtering the first output torque constraint utilizing a second filter response time when the first output torque constraints change in a second direction.

17. The method of claim 13, further comprising controlling power within the powertrain system between the first and second power constraints.

18. The method of claim 13, further comprising:

monitoring operating conditions of the energy storage device comprising an output power of the energy storage device; and

determining the power constraint for transferring power within the powertrain system based on the output power of the energy storage device.

19. Method for controlling a powertrain system, the powertrain system including a transmission device, an engine, and a second torque generating device connected to an energy storage device, the transmission device operative to transfer power between an output member, the engine, and the second torque generating device, the method comprising:

monitoring operating conditions of the engine, the transmission device, and the energy storage device;

determining a maximum torque constraint and a minimum torque constraint for transferring torque within the powertrain system based on the operating conditions;

filtering the maximum torque constraint utilizing a first filter response time when the maximum torque constraint is decreasing;

filtering the maximum torque constraint utilizing a second filter response time when the maximum torque constraint is increasing;

filtering the minimum torque constraint utilizing a third filter response time when the minimum torque constraint increasing; and

filtering the minimum torque constraint utilizing a fourth filter response time when the minimum constraint is decreasing.

20. The method of claim 19, wherein the second filter response time has a greater time lag than the first filter response time and the fourth filter response time has a greater time lag than the third filter response time.