METHOD FOR CONTROLLING SHIFT AT KICKDOWN SHIFT FROM THREE SPEED TO TWO SPEED IN AUTOMATIC TRANSMISSION

摘要

PURPOSE: A shift control method at a kickdown shift is provided to improve the shift quality by improving a shift shock. CONSTITUTION: A sensor of a traveling status outputs an electric signal by receiving a signal according to the traveling status of a vehicle. An output controller accepts a maximum value by detecting a turbine variable rate during a set time by receiving the signal from the sensor when a kickdown shift is performed. The output controller adds a standard value to a learning value by deciding a tie-up. A driving device prevents back pressure and shift shock by controlling hydraulic pressure according to a duty control signal from the controller. Thereby, the riding comfort is improved.