LINE-PRESSURE CONTROL METHOD FOR V-BELT TYPE STEPLESS TRANSMISSION

摘要

PURPOSE:To aim at improvement in the service lift of a V-belt still longer and in power transmission efficiency, by calculating the engine torque out of engine operating conditions on the basis of engine power torque characteristics stored in a microcomputer, while setting the line-pressure in accordance with the calculated value and a reduction ratio. CONSTITUTION:Detected values from both a throttle opening sensor 27 and an engine speed sensor 26 are inputted into a central controller 32 while such engine torque as being corresponding to other of these detected values is read from engine power torque charcteristics memorized in advance and stored into a memory 34. Next, in accordane with the detected values of a driven pulley speed sensor 29 and the engine speed sensor 26, a reduction ratio is calculated, and torque motor voltage values for line-pressure setting use are read out of this reduction ratio and the prestored engine torque. And, according to these values, a torque motor 16 of a line-pressure adjusting valve is controlled.