Shifting control method for vehicle with DCT

Patent metadata

Field	Value
Publication number	US-9822875-B2
Application number	US-201514667958-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Nov 3, 2014
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A shifting control method for a vehicle with a Double Clutch Transmission (DCT), may include determining whether a manual range power-on up shift has been started, determining whether an actual shifting period has been started, when the manual range power-on up shift has been started, and applying additional predetermined compensation torque to basic torque applied to an engagement-side clutch, when the actual shifting period has been started.

First claim

What is claimed is:

1. A shifting control method for a vehicle with a Double Clutch Transmission (DCT), comprising:
determining by a controller, whether a manual range power-on up shift has been started;
determining by the controller, whether an actual shifting period has been started, when the manual range power-on up shift has been started; and
applying by the controller, additional predetermined compensation torque to basic torque applied to an engagement-side clutch, when the actual shifting period has been started.

2. The method of claim 1 , wherein the applying of the additional predetermined compensation torque ramps up the compensation torque to a desired compensation torque and ramps down the compensation torque until shifting is finished.

3. The method of claim 2 , wherein the desired compensation torque is determined in accordance with a degree to which an acceleration pedal is pressed down by a driver and an amount of slip that is a difference between a rotation speed of an engine and a rotation speed of an input shaft of an engagement-side when actual shifting starts.

4. The method of claim 2 , wherein the desired compensation torque is determined in proportion to a degree to which an acceleration pedal is pressed down by a driver and an amount of slip that is a difference between a rotation speed of an engine and a rotation speed of an input shaft of an engagement-side when actual shifting starts.

5. The method of claim 4 , wherein the applying of the additional predetermined compensation torque includes:
determining by the controller, the desired compensation torque, when the determining of whether the actual shifting period has been started determines that the actual shifting period has been started;
ramping up by the controller, compensation torque toward the desired compensation torque determined in the determining of the desired compensation torque;
maintaining by the controller, the desired compensation torque until estimated remaining synchronization time decreases to under a predetermined reference time, when the compensation torque reaches the desired compensation torque; and
removing by the controller, the compensation torque until synchronization is finished by decreasing the compensation torque after the maintaining of the desired compensation torque.

6. The method of claim 5 , wherein the reference time that is a criterion of determining whether to maintain the desired compensation torque is set on a basis of a level where the compensation torque becomes zero by performing the removing of the compensation torque, until a rotation speed of the engine and a rotation speed of the input shaft of the engagement-side are synchronized.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Cho Sung Hyun
• Hur Hwan

Classifications

• F16H61/688

  with two inputs, e.g. selection of one of two torque-flow paths by clutches · CPC title

• F16H61/0437

  by using electrical signals (F16H61/0403 and F16H61/061 take precedence) · CPC title

• F16D13/385

  double clutches, i.e. comprising two friction disc mounted on one driven shaft (with two concentric driven shafts F16D21/06) · CPC title

• F16H63/46 Primary

  Signals to a clutch outside the gearbox · CPC title

• F16D2500/70408

  Torque · CPC title