HYBRID POWERTRAINS AND METHODS OF OPERATING

• US 20090084618A1
• Filed: 09/28/2007
• Published: 04/02/2009
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Thompson, Scott, Sydenstricker, James
• Granted Patent: US 7,766,109 B2
• Time in Patent Office: Days
• US Class Current: 180/65.800
• 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: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: F16H 2037/106 with switching means to provide two variator modes or ranges
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 2200/2035 with two engaging means
• CPC Class Codes: F16H 3/728 with means to change ratio in the mechanical gearing
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

Hybrid powertrains and methods of operating the hybrid powertrains are provided. In an embodiment, the method includes determining whether a temperature of a battery pack in a battery pack module is above or below a first threshold, and providing a command to an electrically variable transmission module to select either a first mode or a second mode in which to operate, when the determination is made that the temperature of the battery pack is below the first threshold.

Claims

1. A hybrid powertrain for use in a vehicle including an engine coupled to a motor, wherein the motor includes a plurality of gears and a plurality of cylinders, the hybrid powertrain comprising:

a battery pack configured to supply power to the motor;

a temperature sensor in communication with the battery pack and configured to sense a temperature of the battery pack;

an electrically variable transmission module configured to provide commands to damp vibrations from the engine; and

a hybrid control module configured to communicate with the temperature sensor to determine whether the sensed temperature of the backpack is above or below a first threshold and to communicate with the electrically variable transmission module such that when the determination is made that the temperature of the battery pack is below the first threshold, the hybrid control module provides commands to the electrically variable transmission module to limit a gear shift command between a first mode or a second mode.

2. The hybrid powertrain of claim 1, wherein the hybrid control module is further configured provide a gear shift command to shift at least one gear of the plurality of gear sets to a third mode, after the determination is made that the temperature of the battery pack is above a second threshold.

3. The hybrid powertrain of claim 1, wherein:

the electrically variable transmission module includes a torque damper configured to damp vibrations of the engine; and

the hybrid control module is further configured to provide a command to the electrically variable transmission module to provide a command to the torque damper to decrease an amount of damping supplied to the engine, when the determination is made that the temperature of the battery pack is below the first threshold.

4. The hybrid powertrain of claim 1, further comprising an engine control module configured to provide commands for supplying fuel to (i) all of the plurality of cylinders, (ii) a portion of the plurality of cylinders, or (iii) none of the plurality of cylinders, and wherein the hybrid control module is further configured to provide supply a command to the engine control module to command the plurality of fuel injectors to inject fuel into all of the cylinders of the plurality of cylinders, when the determination is made that the temperature of the battery pack is below the first threshold.

5. The hybrid powertrain of claim 4, further comprising a system controller configured to provide a braking command to a brake pad, wherein the hybrid control module is further configured to command the system controller to provide a braking command to the brake pad, when the engine control module is supplying a command to the fuel injectors to inject fuel into all of the cylinders of the plurality of cylinders.

6. The hybrid powertrain of claim 5, wherein the hybrid control module is configured to provide a command to the engine control module to command the plurality of fuel injectors to inject fuel into a portion of the cylinders of the plurality of cylinders, when the determination is made that the temperature of the battery pack is above a second threshold.

7. The hybrid powertrain of claim 1, wherein the first threshold is a temperature that is about 0°

C.±

3°

C.

8. A method for operating a hybrid powertrain including a hybrid control module configured to supply commands to an electrically variable transmission module, the electrically variable transmission module configured to supply gear shift commands to a plurality of gears of a vehicle and to receive power from a battery pack module, the method comprising the steps of:

determining whether a temperature of a battery pack in the battery pack module is above or below a first threshold; and

providing a command to the electrically variable transmission module to limit a gear shift command to a first mode and a second mode in which to operate, when the determination is made that the temperature of the battery pack is below the first threshold.

9. The method of claim 8, wherein the step of limiting further comprises providing a gear shift command to shift at least one gear of the plurality of gears to a third mode, after the determination is made that the temperature of the battery pack is above a second threshold.

10. The method of claim 8, wherein the vehicle further includes an engine configured to supply power to the electrically variable transmission module, the electrically variable transmission comprises a torque damper configured to receive commands to damp vibrations from the engine, and the method further comprises:

providing a command to the torque damper to decrease an amount of damping supplied to the engine, when the determination is made that the temperature of the battery pack is below the first threshold.

11. The method of claim 10, further comprising the step of:

increasing an amount of damping supplied to the engine, when the determination is made that the temperature of the battery pack is above a second threshold.

12. The method of claim 11, wherein the step of increasing comprises increasing the amount of damping supplied to the engine based upon a linear function where an amount of power supplied to the torque damper is directly related to a selected sensed temperature of the battery pack.

13. The method of claim 8, comprising an engine control module configured to provide commands to an actuator to supply fuel to a plurality of cylinders, the actuator configured to selectively supply fuel to (i) all of the cylinders of the plurality of cylinders, (ii) a portion of the cylinders of the plurality of cylinders, or (iii) none of the cylinders of the plurality of cylinders, and the method further comprises the step of:

supplying a command to the engine control module to command the plurality of fuel injectors to inject fuel into all of the cylinders, when the determination is made that the temperature of the battery pack is below the first threshold.

14. The method of claim 13, wherein the step of supplying further comprises providing a braking command from a system controller to one or more brake pads, when the engine control module is supplying the command to the fuel injectors to inject fuel into all of the cylinders of the plurality of cylinders.

15. The method of claim 14, further comprising providing a command to the engine control module to command the plurality of fuel injectors to inject fuel into a portion of the cylinders of the plurality of cylinders, when the determination is made that the temperature of the battery pack is above a second threshold.

16. The method of claim 8, wherein the first threshold is a temperature that is about 0°

C.±

3°

C.

17. A method for operating a hybrid powertrain including a hybrid control module configured to supply commands to an electrically variable transmission module and an engine control module, the electrically variable transmission module configured to supply gear shift commands to a plurality of gears of a vehicle and to receive power from a battery pack module and an engine and comprises a torque damper configured to receive commands to damp vibrations from the engine, and the engine control module configured to provide commands to an actuator to supply fuel to a plurality of cylinders, the actuator configured to selectively supply fuel to (i) all of the cylinders of the plurality of cylinders, (ii) a portion of the cylinders of the plurality of cylinders, or (iii) none of the cylinders of the plurality of cylinders, the method comprising the steps of:

determining whether a temperature of the battery pack of the battery pack module is above or below a first threshold;

limiting the gear shift commands of the electrically variable transmission module between a first mode and a second mode, when the determination is made that the temperature of the battery pack is below the first threshold;

providing a command to the torque damper to decrease an amount of damping supplied to the engine, when the determination is made that the temperature of the battery pack is below the first threshold; and

supplying a command to the engine control module to command the plurality of fuel injectors to inject fuel into all of the cylinders of the plurality of cylinders, when the determination is made that the temperature of the battery pack is below the first threshold.

18. The method of claim 17, further comprising the step of:

increasing an amount of damping supplied to the engine, when the determination is made that the temperature of the battery pack is above a second threshold.

19. The method of claim 18, wherein the step of supplying further comprises providing a braking command from a system controller to one or more brake pads, when the engine control module is supplying a command to the fuel injectors to inject fuel into all of the cylinders of the plurality of cylinders.

20. The method of claim 19, wherein the first threshold is a temperature is about 0°

C.±

3°

C.