REDUCTION RATIO CONTROL METHOD OF CONTINUOUSLY VARIABLE TRANSMISSION FOR VEHICLE AND CONTROLLER THEREOF

摘要

PURPOSE: To shift a V-belt type continuously variable transmission down to a specified reduction ratio at the time of car engine braking by detecting the running conditions of throttle opening and brake operation or the like in a vehicle, and starting this down-shift operation at a time when a brake operating signal is inputted. ;CONSTITUTION: Car running conditions such as car speed, throttle opening, output shaft torque, brake operation and so on are detected by each of car running condition detecting means 91-95, while a control signal, controlling a reduction ratio control mechanism according to the detecting signal, is outputted by a logical circuit 912, and the supply and discharge of hydraulic fluid for a hydraulic servo are controlled so as to make the reduction ratio control mechanism vary the reduction ratio of a V-belt type continuously variable transmission. An electric control circuit 90 stores (942) a brake operating signal when it is inputted, while it sets (943) the preset input pulley control revolution RH as a down-shift desired value, comparing (944) it with the current input pulley revolution of a vehicle, and the reduction ratio control mechanism is controlled so as to make this down-shift operation be started.;COPYRIGHT: (C)1993,JPO&Japio