Control system for automatic transmission

摘要

A control system for an automatic transmission, comprising: a fluid transmission unit (12) for transmitting the rotation of an engine (10) to a speed change unit; a clutch (C1) adapted to be applied when a forward running range is selected; a hydraulic servo for applying the clutch (C1) when fed with an oil pressure; an input R.P.M. sensor (91) for detecting the input R.P.M. of the fluid transmission unit; an output R.P.M. (92) sensor for detecting the output R.P.M. of the fluid transmission unit; stop state detection means for detecting the stop state of a vehicle; start state detection means for detecting the shift of the vehicle from the stop state to the start state; and a control unit (95) for controlling the oil pressure to be fed to the hydraulic servo. The oil pressure of the hydraulic servo is reduced, when the vehicle is in the stop state, to establish a neutral control state in which the clutch is released. Further comprised are: release state establishing means for establishing the released state of the clutch by reducing the oil pressure to be fed to the hydraulic servo when the stop state of the vehicle is detected; and complete apply state establishing the completely applied state of the clutch by boosting the oil pressure to be fed to the hydraulic servo when the shift of the vehicle from the stop state to the start state is detected.