Patent ID: 6358179
Filing Date: 2002-03-19
Classification: B60W,F16H

Abstract:
A clutch control device for use with an infinite variable speed ratio transmission for a vehicle, the infinite variable speed ratio transmission comprising an input shaft, a continuously variable transmission which transmits a rotation of the input shaft at an arbitrary speed ratio to a continuously variable transmission output shaft, a fixed speed ratio transmission which transmits the rotation of the input shaft at a fixed speed ratio to a fixed speed ratio transmission output shaft, a planetary gear mechanism having a first rotation member connected to the continuously variable transmission output shaft, a second rotation member connected to the fixed transmission output shaft, and a third rotation member varying a rotation direction and a rotation speed according to a difference of a rotation speed of the first rotation member and a rotation speed of the second rotation member, a direct mode clutch which engages to connect the continuously variable transmission output shaft and the third rotation member and disengages to disconnect the continuously variable transmission output shaft and the third rotation member according to a supplied oil pressure, and a power recirculation mode clutch which engages to connect the fixed speed ratio transmission output shaft and the second rotation member and disengages to disconnect the fixed speed ratio transmission output shaft and the second rotation member according to a supplied oil pressure, the clutch control device comprising:a first valve for supplying an oil pressure to the direct mode clutch and power recirculation mode clutch; means for detecting a running condition of the vehicle; means for controlling the first valve according to the running condition; and means for preventing simultaneous engagement of the direct mode clutch and the power recirculation mode clutch by overriding a control of the first valve by the controlling means when the running condition does not correspond to a predetermined specific region, and permits simultaneous engagement of the direct mode clutch and the power recirculation mode clutch when the running condition corresponds to the predetermined specific region.