from the shift pattern map of the memory 50 using the detected throttle open angle and the detected vehicle speed and generates a corresponding shift signal for shifting to the determined target speed however if the number of shift signals generated within a predetermined time period is greater than or equal to a predetermined number a shift according to the shift signal generated after the predetermined number is reached occurs only after the shift according to the previous speed shifting has been terminated for example if the predetermined number is three a shift according to the third shift signal is performed only after the shift according to the second shift signal is terminated and a shift according to a fourth shift signal is performed only after a shift according to a third shift signal is terminated the actuator 60 is operated according to the signal input from the transmission control unit 40 and regulates the hydraulic pressure duty such that shift synchronization for the target speed is performed referring to fig2 shift control method according to a preferred embodiment of the present invention will be explained hereinafter the transmission control unit 40 determines if a speed change is demanded on the basis of the change rate of the throttle valve opening while a vehicle is running s 101 and s 102 the determination of the need for a speed change in this step is conventionally based if the transmission control unit 40 determines that a speed change is needed the transmission control unit 40 determines the target speed from the shift pattern map stored in the.