Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SHIFT CONTROL METHOD FOR AUTOMATIC TRANSMISSION
Document Type and Number:
Japanese Patent JP2013002630
Kind Code:
A
Abstract:

To provide a shift control method for an automatic transmission for performing shifting by coupling and releasing action of a friction element by hydraulic pressure, in which shift shock at the final stage of shifting is reduced or prevented to improve shift feeling, thereby contributing to the improvement of commodity worth of a vehicle.

The method includes a first stage of detecting the end point of a coasting interval from among upshift, a second stage of instantaneously reducing the hydraulic pressure to be provided to a coupling side friction element at the end point of the detected coasting interval, a third stage of increasing the reduced hydraulic pressure at a predetermined increasing rate until reaching a synchronous point, and a fourth stage of instantaneously increasing the hydraulic pressure when the synchronous point has been reached.


Inventors:
DEN HEIUKU
Application Number:
JP2011208503A
Publication Date:
January 07, 2013
Filing Date:
September 26, 2011
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HYUNDAI MOTOR CO LTD
KIA MOTORS CORP
International Classes:
F16H61/06; F16H61/684
Domestic Patent References:
JP2008056108A2008-03-13
JP2008106871A2008-05-08
JP2008056108A2008-03-13
Attorney, Agent or Firm:
Kyosei International Patent Office