| 摘要 |
An automatic transmission has a lockup clutch having a release side chamber and an apply side chamber. A lockup control valve having a spool is provided for controlling oil supplied to the release side chamber and apply side chamber. A solenoid operated valve is provided for controlling position of the spool of the lockup control valve to control pressure of oil supplied to the release side and apply side of chamber. A sensor is provided for sensing rotational speed of an output shaft of the automatic transmission. The solenoid operated valve is operated by a signal representing amplitude of variation of the output of the sensor, thereby controlling the pressure of the oil to increase of slipping the lockup clutch with increase of the amplitude. |
