Control apparatus for transmission

摘要

For a transmission having a forward drive train, a reverse drive train and a starting clutch (5), a control apparatus comprises a clutch control valve (75) for setting a clutch control pressure to control the engagement of the starting clutch (5) and a reverse inhibitor valve (63) for opening and closing a line to a reverse drive actuator. When the clutch control pressure increases to a value above a predetermined value, the reverse inhibitor valve (63) closes the line to the reverse drive actuator. For a transmission having drive and driven cylinders (14,19) for controlling the speed ratio set by variable width drive and driven pulleys (11,16) and a starting clutch (5) for controlling power transmission; a control apparatus comprises a controller (70) for judging whether or not a vehicle is in a predetermined normal forward driving mode (a driving condition which does, not require a speed change or a rapid speed change), a clutch control valve (75) for setting a clutch control pressure to control the engagement of the starting clutch (5), and a high pressure control valve (47) for setting a speed-ratio changing pressure which is supplied to the drive and driven cylinders (14,19). When the vehicle is judged by the controller (70) as being in the predetermined normal forward driving mode, the high pressure control valve (47) corresponding to the clutch control pressure sets the speed-ratio changing pressure to a pressure lower than the pressure set at while the vehicle is not in the predetermined normal forward driving mode.