Diagnostic method for determining clutch failure of DCT

Patent metadata

Field	Value
Publication number	US-9702420-B2
Application number	US-201615138941-A
Country	US
Kind code	B2
Filing date	Apr 26, 2016
Priority date	Nov 5, 2015
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A diagnostic method of determining clutch failure of a dual clutch transmission (DCT) includes comparing, by a controller, a wheel torque of a vehicle with a driving load torque of the vehicle, confirming, by the controller, whether or not the vehicle is driving, if, as a result of comparing step, the wheel torque is greater than the driving load torque, releasing, by the controller, a gear engaged with a non-drive shaft, if, as a result of the confirming step, the vehicle is in a stopped state, reconfirming, by the controller, whether or not the vehicle is driving, after the releasing step, and judging, by the controller, that a transmission clutch of the non-drive shaft fails, if, as a result of the reconfirming step, the vehicle is driving.

First claim

What is claimed is:

1. A diagnostic method of determining clutch failure of a dual clutch transmission (DCT), comprising:
comparing, by a controller, a wheel torque of a vehicle with a driving load torque of the vehicle;
confirming, by the controller, whether or not the vehicle is driving, if, as a result of the comparing step, the wheel torque is greater than the driving load torque;
releasing, by the controller, a gear engaged with a non-drive shaft, if, as a result of the confirming step, the vehicle is in a stopped state;
reconfirming, by the controller, whether or not the vehicle is driving, after the releasing step; and
judging, by the controller, that a transmission clutch of the non-drive shaft fails, if, as a result of the reconfirming step, the vehicle is driving.

2. The diagnostic method of determining clutch failure according to claim 1 , wherein the controller executes the comparing step if a driving mode of the vehicle is an electric vehicle (EV) mode.

3. The diagnostic method of determining clutch failure according to claim 1 , wherein the controller executes the comparing step, if an engine clutch is released.

4. The diagnostic method of determining clutch failure according to claim 1 , wherein, if, as a result of the reconfirming step, the vehicle is determined to be in the stopped state, the controller judges that the transmission clutch of the non-drive shaft is in a normal state.

5. The diagnostic method of determining clutch failure according to claim 1 , wherein, in the releasing step, the controller releases a first gear when a shift lever is located at a position R and releases a second gear when the shift lever is located at a position N or a position D.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Yoon Young Min

Classifications

• F16D2500/10412

  Transmission line of a vehicle · CPC title

• F16D21/02

  for interconnecting three or more shafts or other transmission members in different ways (in endless-track vehicles B62D) · CPC title

• F16D2500/3125

  Driving resistance, i.e. external factors having an influence in the traction force, e.g. road friction, air resistance, road slope · CPC title

• F16D2500/50284

  Control of secondary clutch in the driveline, i.e. not including clutches in automatic transmission, e.g. in the vicinity of rear axle or on parallel drive shaft · CPC title

• F16D48/064 Primary

  Control of electrically or electromagnetically actuated clutches (F16D48/062, F16D48/068 take precedence) · CPC title