Driving mode control method and apparatus of hybrid electric vehicle

Patent metadata

Field	Value
Publication number	US-10000201-B2
Application number	US-201615265192-A
Country	US
Kind code	B2
Filing date	Sep 14, 2016
Priority date	Apr 8, 2016
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A driving mode control method and apparatus of a hybrid electric vehicle are provided. The driving mode control method includes decreasing a torque of an engine when a first driving mode in which both the engine and a first motor are driven is switched to a second driving mode driven by the first motor and applying a torque of a second motor. A clutch is then opened when a difference between the engine torque and the second motor torque is less than a first threshold torque.

First claim

What is claimed is:

1. A driving mode control method, comprising:
decreasing, by a controller, a torque of an engine when a first driving mode, in which both the engine and a first motor are driven is switched to a second driving mode, is driven only by the first motor;
applying, by the controller, a torque of a second motor; and
opening, by the controller, a clutch when a difference between the engine torque and the second motor torque is less than a first threshold torque,
wherein the clutch is disposed between the engine and the first motor.

2. The driving mode control method according to claim 1 , wherein the applying of the second motor torque includes:
applying, by the controller, the second motor torque in consideration of the engine torque, a torque of the first motor and a required torque for acceleration.

3. The driving mode control method according to claim 1 , wherein the opening of the clutch includes:
releasing, by the controller, fluid pressure for operating the clutch.

4. The driving mode control method according to claim 3 , wherein the releasing of the fluid pressure includes:
adjusting, by the controller, the first and second motor torques such that a sum of the engine torque and the second motor torque is equal to a second threshold torque based on a decrease of the engine torque.

5. The driving mode control method according to claim 1 , when a difference between the engine torque and the second motor torque is less than the first threshold torque and the clutch is in a locked-up state, further comprising:
cutting off, by the controller, supply of fuel for driving the engine when the engine torque is less than a third threshold torque.

6. The driving mode control method according to claim 1 , wherein the second motor is an integrated starter generator (ISG) connected to the engine.

7. The driving mode control method according to claim 1 , wherein the applying of the second motor torque includes:
applying, by the controller, the second torque up to a minimum torque of the second motor torque at a predetermined rate.

8. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:
program instructions that decrease a torque of an engine when a first driving mode, in which both the engine and a first motor are driven is switched to a second driving mode, is driven only by the first motor;
program instructions that apply a torque of a second motor; and
program instructions that open a clutch when a difference between the engine torque and the second motor torque is less than a first threshold torque,
wherein the clutch is disposed between the engine and the first motor.

9. The non-transitory computer readable medium of claim 8 , further comprising:
program instructions that apply the second motor torque in consideration of the engine torque, a torque of the first motor and a required torque for acceleration.

10. The non-transitory computer readable medium of claim 8 , further comprising:
program instructions that release fluid pressure for operating the clutch.

11. A driving mode control apparatus, comprising:
a controller configured to decrease a torque of an engine when a first driving mode, in which both the engine and a first motor are driven is switched to a second driving mode, is driven only by the first motor; and applying, by the controller, a torque of a second motor; and
a communication unit configured to transmit a control signal to the engine, the first motor, and the second motor,
wherein the controller is configured to open a clutch when a difference between the engine torque and the second motor torque is less than a first threshold torque,
wherein the clutch is disposed between the engine and the first motor.

12. The driving mode control apparatus according to claim 11 , wherein the controller is configured to apply the second motor torque in consideration of the engine torque, a torque of the first motor, and a required torque for acceleration.

13. The driving mode control apparatus according to claim 11 , wherein the controller is configured to release fluid pressure for operating the clutch.

14. The driving mode control apparatus according to claim 13 , wherein the controller is configured to adjust the first and second motor torques such that a sum of the engine torque and the second motor torque is equal to a second threshold torque based on a decrease of the engine torque.

15. The driving mode control apparatus according to claim 11 , wherein, when a difference between the engine torque and the second motor torque is less than the first threshold torque and the clutch is in a locked-up state, the controller is configured to cut off supply of fuel for driving the engine when the engine torque is less than a third threshold torque.

16. The driving mode control apparatus according to claim 11 , wherein the second motor is an integrated starter generator (ISG) connected to the engine.

17. The driving mode control apparatus according to claim 11 , wherein the controller is configured to apply the second torque up to a minimum torque of the second motor torque at a predetermined rate.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Sang Joon
• Park Seong Ik
• Chung Kwon Chae
• Park Il Kwon

Classifications

• B60K6/387

  Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means · CPC title

• B60K6/26

  characterised by the motors or the generators · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• Y10S903/93

  Conjoint control of different elements · CPC title

• B60K6/485

  Motor-assist type · CPC title