Controlling device for stepless transmission used in vehicle

Abstract

Abstract PURPOSE:To drive a vehicle at an optimal fuel consumption rate and to prevent occurrence of shocks at the time of gear shifting, by providing an electric control circuit to which signals relating to operational conditions of an engine are given, and a hydraulic pressure controlling circuit for controlling the timing and other factors of the operation of a gear shifting mechanism in an automatic transmission for a vehicle. CONSTITUTION:An electric control circuit, to which are given signals relating to the throttle opening, vehicle speed, speed of rotation of an input pulley, setting positions P-L of a shift lever, etc., controls the hydraulic pressure supplied to a hydraulic servo-mechanism 313 and thereby controls the torque ratio of input and output shafts of a V-belt type stepless transmission (not shown) by a torque ratio controlling means 80. Further, the rise time of hydraulic pressure supplied to a hydraulic servo-mechanism of a transmission (not shown) used for switching front drive and back drive is controlled by a shift controlling mechanism 70. On the other hand, a hydraulic pressure controlling circuit 60 comprises a manual valve 62, a detent valve 64 and a throttle valve 65 which produce outputs corresponding to the throttle opening, a torque ratio valve 66 which supplies a line pressure to the valve 64 in response to the displacement of a movable flange of an output pulley and removes pressure in a feeback oil passage 9 for the valve 65, and a regulator valve 61 which controls the hydraulic pressure of a hydraulic pressure source 50 and supplies the same as line pressure.

Inventors

• 👤 Nobuaki Miki
• 👤 Shoji Yokoyama

Bibliographic Details