Apparatus and method for controlling hybrid electric vehicle including dual clutch transmission

Patent metadata

Field	Value
Publication number	US-10005452-B2
Application number	US-201615131575-A
Country	US
Kind code	B2
Filing date	Apr 18, 2016
Priority date	Dec 10, 2015
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A method and an apparatus for controlling a hybrid electric vehicle including a dual clutch transmission are provided. The method for controlling a hybrid electric vehicle including a dual clutch transmission may include: determining whether an engine start condition is satisfied in a state in which an engine is stopped; determining whether a kick-down shift condition is satisfied when the engine start condition is satisfied; connecting a speed gear corresponding to a target gear stage to an output shaft corresponding to the target gear stage when the kick-down shift condition is satisfied; determining whether a lock-up condition of an engine clutch is satisfied when the engine start condition is satisfied; locking up the engine clutch when the lock-up condition of the engine clutch is satisfied; and locking up a shift clutch corresponding to the target gear stage when the engine clutch is locked up.

First claim

What is claimed is:

1. A method for controlling a hybrid electric vehicle including a dual clutch transmission, comprising:
determining whether an engine start condition is satisfied in a state in which an engine is stopped;
determining whether a kick-down shift condition is satisfied when the engine start condition is satisfied;
connecting a speed gear corresponding to a target gear stage to an output shaft corresponding to the target gear stage when the kick-down shift condition is satisfied;
determining whether a lock-up condition of an engine clutch is satisfied when the engine start condition is satisfied;
locking up the engine clutch when the lock-up condition of the engine clutch is satisfied; and
locking up a shift clutch corresponding to the target gear stage when the engine clutch is locked up.

2. The method of claim 1 , wherein whether the kick-down shift condition is satisfied is determined based on a position value of an accelerator pedal, a speed of the hybrid electric vehicle, and a current gear stage.

3. The method of claim 1 , wherein the lock-up condition of the engine clutch is satisfied when an absolute value of a difference between a speed of the engine and a speed of a driving motor is less than a predetermined value.

4. The method of claim 1 , further comprising not connecting a speed gear corresponding to a next gear stage to the output shaft corresponding to the next gear stage in the state in which the engine is stopped.

5. The method of claim 1 , wherein the connecting the speed gear corresponding to the target gear stage to the output shaft corresponding to the target gear stage when the kick-down shift condition is satisfied is performed
while a state of the engine clutch is changed from a release state to a lock-up state.

6. An apparatus for controlling a hybrid electric vehicle, comprising:
an engine clutch disposed between an engine and a driving motor;
a dual clutch transmission including two shift clutches and a gear train;
a data detector configured to detect data for controlling the hybrid electric vehicle; and
a controller configured to control the engine clutch and the dual clutch transmission based on the data,
wherein the controller determines whether an engine start condition is satisfied in a state in which an engine is stopped,
determines whether a kick-down shift condition is satisfied when the engine start condition is satisfied,
connects a speed gear corresponding to a target gear stage to an output shaft corresponding to the target gear stage when the kick-down shift condition is satisfied,
determines whether a lock-up condition of the engine clutch is satisfied when the engine start condition is satisfied,
locks up the engine clutch when the lock-up condition of the engine clutch is satisfied, and
locks up a shift clutch corresponding to the target gear stage when the engine clutch is locked up.

7. The apparatus of claim 6 , wherein the controller determines whether the kick-down condition is satisfied based on a position value of an accelerator pedal, a speed of the hybrid electric vehicle, and a current gear stage.

8. The apparatus of claim 6 , wherein the lock-up condition of the engine clutch is satisfied when an absolute value of a difference between a speed of the engine and a speed of the driving motor is less than a predetermined value.

9. The apparatus of claim 6 , wherein the controller does not connect a speed gear corresponding to a next gear stage to the output shaft corresponding to the next gear stage in the state in which the engine is stopped.

10. The apparatus of claim 6 , wherein the controller connects the speed gear corresponding to the target gear stage to the output shaft corresponding to the target gear stage while a state of the engine clutch is changed from a release state to a lock-up state.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Jeon Byeong Wook
• Nam Ju Hyun

Classifications

• B60K6/36

  characterised by the transmission gearings · CPC title

• B60K6/387

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

• B60Y2300/421

  Control of lock-up type clutches, e.g. in a torque converter · CPC title

• B60K2006/4825

  Electric machine connected or connectable to gearbox input shaft · CPC title

• Y10S903/93

  Conjoint control of different elements · CPC title