Shift control device when selecting 2nd speed during 3rd speed to L speed and its method

摘要

The present invention relates to a shift control apparatus at the time of selecting the second speed among the shifts from the third speed to the L speed, comprising: turbine rotation speed detection means for sensing turbine rotation speed which is an input speed of a transmission; Vehicle speed detecting means for detecting a vehicle speed which is an output side rotational speed of the transmission; If shift from L to 2 speed is selected during the shift from 3 to L speed, if the turbine speed divided by the vehicle speed is close to 3 speed, the downshift from 3 speed to 2 speed is made. When the shift signal is output and the value obtained by dividing the turbine speed by the vehicle speed is located between the 2nd speed and the 1st speed, the shifting signal is output so that an upshift from the 1st speed to the 2nd speed is achieved, and the turbine speed is set to the vehicle speed. Control means for determining that the shift to the second speed is completed when the value divided by is close to the synchronization point at the second speed; It includes a shift means for supplying hydraulic pressure to the friction element in accordance with the shift signal output from the control means, by controlling the shift operation in accordance with the detected turbine speed and the vehicle speed, it is possible to prevent the shift shock.