| 摘要 |
PURPOSE:To prevent an engine from overrunning by judging whether or not a down-shift signal should be sent to control the rotational speed according to the comparation of the maximum allowable input rotational speed with input pulley rotational speed when the down-shift signal is outputted. CONSTITUTION:In a torque ratio controller 4 for changing the torque ratio between the input and output members of a continuously variable transmission 2 by an actuator 9 according to the output of a set torque ratio selector 3 operated by a driver, a present torque ratio detecting means 41 for detecting the present torque ratio on the basis of the output of rotational frequency sensors 7, 8 for detecting the respective rotational frequencies of the input and output members of the continuously variable transmission is provided. Also, a shift signal generating means 42 for generating a shift signal according to the present torque ratio/set torque ratio = C is provided. When the maximum allowable input rotational speed - input pulley rotational speed = B is B>0 in X>C, a down-shift signal is generated and when X<=C<1 and B<=0, a signal for maintaining the present torque ratio is generated. |
