| 摘要 |
PURPOSE:To prevent the excessive tension of a transmission belt by judging if the travelling state is within a region in which the hydraulic pressure in a driven side hydraulic actuator is to be decompressed or not, on the basis of the demanded output value, engine revolution speed, and car speed and controlling a pressure adjusting valve. CONSTITUTION:An electronic controller 460 receives the signals of a car speed sensor 462, input/output shaft revolution sensors 464 and 466, throttle opening degree sensor 468, etc., and it is judged if the travelling state of a vehicle is within a region in which the hydraulic pressure into a driven side hydraulic actuator 56 is to be decompressed or not, on the basis of the demanded output value of the vehicle, engine revolution speed, and car speed. When it is judged that the travelling state is within a decompression region, a solenoid valve 346 as decompression signal generating means is operated, and a decompression hydraulic signal is supplied into the chamber of a pressure adjusting valve in a hydraulic control circuit. Therefore, on the basis of the centrifugal hydraulic pressure generated in a driven side hydraulic actuator, the excessive increase of the tension of a transmission belt can be prevented. |
