| 摘要 |
PURPOSE:To correctly control the duty ratio of a solenoid valve by detecting the higher or lower state of the hydraulic pressure in comparison with a standard value when an engine is in idling state and correcting the operation of the solenoid valve by comparing the operation state of the solenoid valve with the aimed operation state after the judgement for the hydraulic pressure. CONSTITUTION:A control unit 8 checks the operation state at present according to the detection signals supplied from a throttle sensor 1, turbine revolution sensor 2, car speed sensor 3, and an inhibitor switch 4. When an engine 9 is in idling state, the set duty ratio is read out from a map, and the difference between the set duty ratio and the learned duty ratio obtained through correction is detected. According to the higher or lower value of the line pressure at present in comparison with a standard value, the difference is obtained from the set duty ratio, and further the oil temperature is applied with the correction for the duty ratio, and the finally corrected duty ratio is determined, and a duty solenoid valve 5 is controlled. |
