# US 8,771,145 B2 · Method of controlling double clutch transmission of vehicle

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- Number: US 8,771,145 B2
- Document ID: US8771145B2
- Status: Granted
- Kind: B2
- Application number: 13/303,892
- Filed: 2011-11-23
- Published: 2012-12-13
- Granted: 2014-07-08
- Earliest claimed: 2011-06-09
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Joung Chul Kim; Ju Hyun Nam; Hee Yong Lee; Byeong Wook Jeon
- Inventors: Joung Chul Kim; Ju Hyun Nam; Hee Yong Lee; Byeong Wook Jeon
- Web page: https://patentgrep.com/patent/US8771145B2

## CPC

- F16H 61/688: with two inputs, e.g. selection of one of two torque-flow paths by clutches
- B60W 10/02: including control of driveline clutches
- B60W 10/113: with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch
- B60W 30/19: Improvement of gear change, e.g. by synchronisation or smoothing gear shift
- B60W 2030/18081: {With torque flow from driveshaft to engine, i.e. engine being driven by vehicle}
- F16H 61/0437: {by using electrical signals (F16H61/0403 and F16H61/061 take precedence)}
- F16H 61/21: Providing engine brake control
- F16H 2306/18: Preparing coupling or engaging of future gear
- F16H 2306/44: Removing torque from current gears
- F16H 2306/46: Uncoupling of current gear
- F16H 2306/50: Coupling of new gear
- Y10T 74/19219: Interchangeably locked
- F16H: GEARING
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of controlling a double clutch transmission of a vehicle to conduct a series of downshifting operations from a preceding gear to a subsequent gear via a current gear in response to deceleration of the vehicle, may include maintaining a clutch which has been in an engaged state at the preceding gear, in the engaged state until after an order to shift to the subsequent gear may be generated, when shifting from the preceding gear to the current gear, releasing the clutch after the order to shift to the subsequent gear may be generated, and engaging a shift gear of the subsequent gear after the releasing of the clutch.

## Claims

### Claim 1

A method of controlling a double clutch transmission of a vehicle to conduct a series of downshifting operations from a preceding gear to a subsequent gear via a current gear in response to deceleration of the vehicle, the method comprising:
engaging a clutch at the preceding gear;
maintaining the clutch in an engaged state with the preceding gear at a constant torque level until after an order to shift to the subsequent gear is generated, when shifting from the preceding gear to the subsequent gear via the current gear;
releasing the clutch after the order to shift to the subsequent gear is generated; and
engaging a shift gear of the subsequent gear after the releasing of the clutch.

### Claim 2 (depends on 1)

The method as set forth in claim 1, further comprising:
releasing a shift gear of the preceding gear during the maintaining of the clutch.

### Claim 3

A method of controlling a double clutch transmission of a vehicle to conduct a series of downshifting operations from a preceding gear to a subsequent gear via a current gear in response to deceleration of the vehicle, the method comprising:
engaging a clutch at the preceding gear, wherein the clutch controls transmission of power to an input shaft connected to the shift gear of the preceding gear;
releasing the preceding gear by releasing a shift gear of the preceding gear while the clutch, is in an engaged state with a constant torque level from before the downshifting from the preceding gear to current gear, and
shifting gears to the subsequent gear by releasing the clutch from the engaged state from the preceding gear, and engaging a shift gear of the subsequent gear.

### Claim 4 (depends on 3)

The method as set forth in claim 3, wherein when shifting the current gear between the preceding gear and the subsequent gear, the clutch which has been in the engaged state at the preceding gear is continuously maintained in the engaged state.

### Claim 5

A method of controlling a double clutch transmission of a vehicle to conduct a series of downshifting operations from a preceding gear to a subsequent gear via a current gear in response to deceleration of the vehicle, the method comprising:
controlling a clutch connected to an input shaft pertaining both to the preceding gear and the subsequent gear such that the clutch is continuously maintained in an engaged state with a constant torque level just before a shift gear of the subsequent gear is engaged via the current gear.