Method for preventing baulking of DCT for vehicle

Patent metadata

Field	Value
Publication number	US-9599173-B2
Application number	US-201514947546-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Jun 26, 2015
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A method for reducing baulking of a dual clutch transmission (“DCT”) for a vehicle includes a first engaging step engaging an odd-stage clutch and an even-stage clutch of a DCT in a case of an ignition-on state. An ascertaining step ascertains a range positioned by a shift lever when an engine is cranked after the first engaging step. A second engaging step engages shift gears respectively, after disengaging at least one of the odd-stage clutch and the even-stage clutch depending on the ascertained range position of the shift lever.

First claim

What is claimed is:

1. A method for reducing baulking of a dual clutch transmission (DCT) for a vehicle comprising:
a first engaging step of engaging an odd-stage clutch and an even-stage clutch of the DCT in a case of ignition-on;
an ascertaining step of ascertaining a range positioned by a shift lever when an engine is cranked after the first engaging step; and
a second engaging step of engaging shift gears respectively, after disengaging at least one of the odd-stage clutch and the even-stage clutch depending on the ascertained range of the shift lever.

2. The method of claim 1 , wherein when the position of the shift lever is ascertained as a P range by the ascertaining step, the second engaging step engages 1st stage shift gears and R stage shift gears respectively, after disengaging both of the odd-stage clutch and the even-stage clutch.

3. The method of claim 1 , wherein when the position of the shift lever is ascertained as an N range by the ascertaining step, the second engaging step engages 1st stage shift gears after disengaging the odd-stage clutch, maintains the even-stage clutch engaged, and leaves even-stage shift gears at neutral position.

4. The method of claim 1 , further comprising:
a re-ascertaining step of ascertaining again a range positioned by the shift lever after the second engaging step; and
a third engaging step of engaging shift gears respectively, after disengaging at least one of the odd-stage clutch and the even-stage clutch depending on the re-ascertained range of the shift lever.

5. The method of claim 4 , wherein when the position of the shift lever is re-ascertained as a P range by the re-ascertaining step, the third engaging step engages 1st stage shift gears after disengaging the odd-stage clutch.

6. The method of claim 4 , wherein when the position of the shift lever is re-ascertained as an R range by the re-ascertaining step, the third engaging step engages R stage shift gears after disengaging the even-stage clutch and moves odd-stage shift gears to neutral position after disengaging the odd-stage clutch.

7. The method of claim 5 , wherein when the position of the shift lever is re-ascertained as one of an N range and a D range by the re-ascertaining step, the third engaging step engages 1st stage shift gears after disengaging the odd-stage clutch and moves even-stage shift gears to neutral position after engaging the even-stage clutch.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Yoon Young Min
• Cho Sung Hyun

Classifications

• F16D2500/1083

  Automated manual transmission · CPC title

• F16D2500/31466

  Gear lever · CPC title

• F16H2061/047

  by preventing or solving a tooth butt situation upon engagement failure due to misalignment of teeth · CPC title

• F16D48/06

  Control by electric or electronic means, e.g. of fluid pressure · CPC title

• F16H61/12 Primary

  Detecting malfunction or potential malfunction, e.g. fail safe (in control of hydrostatic gearing F16H61/4192) {; Circumventing or fixing failures} · CPC title