a filter output ni_fil which is a change component by generation of transmission torque of an engaged side clutch is thus provided when this filter output ni_fil falls to less than a first threshold value of u2212 ref1 and thereafter becomes less than a second threshold value of u2212 ref2 without recovering to be equal to or higher than the first threshold value of u2212 ref1 it is determined to be the start of the torque phase application_number US 45071899 A description referring to fig8 15 an explanation will be given of an embodiment embodying the present invention the flowchart of fig8 shows a flowchart associated with the learning control with regard to a release awaiting time period tr of a released side instruction value and an initial value ci of an engaged side instruction value in power on up shift from the forward first speed stage to the forward second speed stage the control is executed by a microcomputer in the electric control apparatus 40 shown in fig1 and is executed at every operation period of a main routine of the microcomputer control programs of the microcomputer are mounted with a control program which functions as a secondary butterworth high pass filter having a cutoff frequency of 1 0 hz according to the learning control as shown in fig8 at step 201 the up shift control is started based on speed shift start instruction then at step 202 it is determined whether learning is permitted and the operation proceeds to step 203 when learning control is permitted at step 203 the speed shift.