Control device for a continuosly variable transmission

摘要

In a torque converter(T/C) speed ratio calculation section (32), the speed ratio in a torque converter is determined from the revolution speed of the engine (Ne) and the revolution speed of the primary pulley (Np). A T/C torque ratio calculation section (34) then calculates the torque ratio from the speed ratio. An input torque estimation section (35) then estimates the input torque input into a continuously variable transmission (1) from the above torque ratio and the engine output torque determined by an engine torque calculation section (31). The T/C speed ratio calculation section is provided with a correction amount calculation section and correction is performed such that the speed ratio when the accelerator pedal is depressed is reduced in the direction in which it is less than Np/Ne. As a result, because the disparity with the real value of the speed ratio occurring in the dead time of the respective revolution sensors can be decreased and the input torque properly estimated, slippage between the V belt and the variable pulley is prevented.