| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control device which can shorten a period of a filling phase.SOLUTION: A hydraulic control device 1 controls engagement states and release states of friction elements 5a to 5e by controlling supply pressure being hydraulic pressure supplied to the friction elements 5a to 5e of a vehicle automatic transmission 2. When the friction elements 5a to 5e transited to the engagement states from the release states, supply pressure command means 50a acquires a command value of the supply pressure so as sequentially form a first stationary phase at which a waveform indicating a temporal change of the command value of the supply pressure is maintained at a lower limit value, a filling phase which exhibits a temporary rise waveform, a standby phase maintained at a value lower than the filling phase, a hydraulic control phase accompanied by the rise waveform, and a second stationary phase which is imparted with an upper limit value in this order. The supply pressure command means comprises a TCU 50 which controls selector valves 55a to 55e so that a connecting destination of a feedback chamber becomes a drain oil passage 46 at the filling phase. Therefore, valve bodies of electromagnetic valves 35a to 35e become favorable in motion by operating while withstanding the pressure of the drain oil passage 46, and there can be obtained the smooth motions of the valve bodies.SELECTED DRAWING: Figure 1 |
