| 摘要 |
PURPOSE:To reduce the pressure withstanding strength of an oil cooler by connecting the exhaust passage with the supply passage for the working fluid for car height adjusting actuator through a bypass valve, which is so arranged as to open gradually when operation is stopped. CONSTITUTION:A timer is actuated to set the time Toff at which a main relay is turned off when an ignition switch is put off. A control part determines the supply current Ib to the solenoid 190 of a solenoid opening/closing valve 186 on the basis of the relation map between time and current. The current Ib determined is supplied to the solenoid opening/closing valve 186, to open a bypass valve 196 gradually. When the Off time has passed, the main relay is turned off. This constitution can avoid a large quantity of working fluid from abruptly flowing via bypass valve when the operation is stopped, which will reduce the pressure withstand strength of an oil cooler etc. |
