Apparatus and method for controlling torque reduction of hybrid electric vehicle

• US 9,358,973 B2
• Filed: 11/24/2014
• Issued: 06/07/2016
• Est. Priority Date: 05/15/2014
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Sang Joon, Park, Joonyoung
• Primary Examiner(s): CHEUNG, CALVIN K
• Application Number:
  US14/552,152
• Publication Number:
  US 20150329100A1
• Time in Patent Office: 561 Days
• US Class Current: 1/1
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2520/00 Input parameters relating to overall vehicle dynamics
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/18172 Preventing, or responsive to skidding of wheels
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A method for controlling torque reduction of a hybrid electric vehicle including a motor and an engine includes determining whether a demand torque of a traction control system (TCS) is generated. When the demand torque of the TCS is generated, the demand torque of the TCS and a motor output torque is compared. Based on a result of the comparison, torque reduction is performed by using only one of a motor torque. Also disclosed are an apparatus configured to perform the method for controlling torque reduction and a computer readable storage medium causing performance of torque reduction through the use of only one of a motor torque and an engine torque.

Claims

1. A method for controlling torque reduction of a hybrid electric vehicle including a motor and an engine, the method comprising:

determining whether a demand torque of a traction control system (TCS) is generated;

when the demand torque of the TCS is generated, comparing the demand torque of the TCS and a motor output torque; and

based on a result of the comparing, performing torque reduction by using only one of a motor torque and an engine torque.

2. The method of claim 1, wherein the performing torque reduction comprises simultaneously setting a motor torque command and an engine torque command.

3. The method of claim 2, wherein the motor torque command is set as the demand torque of the TCS and the engine torque command is set as 0 when the demand torque of the TCS is less than the motor output torque.

4. The method of claim 3, wherein the engine torque command is set to control a net torque output from the engine to be 0.

5. The method of claim 2, wherein the motor torque command is set as the motor output torque and the engine torque command is set as a value determined by subtracting the motor output torque from the demand torque of the TCS when the demand torque of the TCS is greater than or equal to the motor output torque.

6. The method of claim 1, wherein the torque reduction is performed by using the motor torque only when the demand torque of the TCS is less than the motor output torque.

7. The method of claim 1, wherein the torque reduction is performed by using the engine torque only when the demand torque of the TCS is greater than or equal to the motor output torque.

8. An apparatus for controlling torque reduction of a hybrid electric vehicle, the apparatus comprising:

an engine configured to be a power source for accelerating a wheel;

a motor configured to be a power source for driving a wheel;

a traction control system (TCS) configured to prevent a wheel slip; and

a controller configured to control an engine output torque and a motor output torque,

wherein the controller is configured to;

execute a comparison of a demand torque of the TCS and the motor output torque; and

perform torque reduction by using only one of a motor torque and an engine torque based on a result of the comparison.

9. The apparatus of claim 8, wherein the controller is further configured to perform torque reduction by simultaneously executing a motor torque command and an engine torque command.

10. The apparatus of claim 9, wherein the controller is further configured to perform torque reduction by setting the motor torque command as the demand torque of the TCS and the engine torque command as 0 when the demand torque of the TCS is less than the motor output torque.

11. The apparatus of claim 10, wherein the controller is further configured to control the engine torque command to set a net torque output from the engine as 0.

12. The apparatus of claim 9, wherein the controller is configured to perform torque reduction by setting the motor torque command as the motor output torque and the engine torque command as a value determined by subtracting the motor output torque from the demand torque of the TCS when the demand torque of the TCS is greater than or equal to the motor output torque.

13. The apparatus of claim 8, wherein the controller is configured to perform torque reduction by using the motor torque only when the demand torque of the TCS is less than the motor output torque.

14. The apparatus of claim 8, wherein the controller is configured to perform torque reduction by using the engine torque only when the demand torque of the TCS is greater than or equal to the motor output torque.

15. The apparatus of claim 8, wherein the controller is further configured to control the engine output torque by adjusting at least one of a fuel injection amount, an ignition timing, and a throttle valve.

16. A non-transitory computer readable storage medium containing a computer program configured to cause the following to occur in a hybrid electric vehicle when the computer program is read and processed by a computer system:

comparison of a demand torque of a traction control system and a motor output torque, and

performance of torque reduction through the use of only one of a motor torque and an engine torque based on a result of the comparison.