| 摘要 |
PURPOSE:To carry out excellent oil pressure control by restraining static characteristic dispersion at least on the low pressure control side in a valve operation control device for a high speed on-off solenoid valve by means of PWM control. CONSTITUTION:A valve operation control means (c) is provided to operate/ control a high speed on-off solenoid valve (a) by using low duty driving frequency when a duty ratio shows at least the low pressure control side while using the duty ratio as control pressure information to know the magnitude of a control pressure and using duty driving frequency as a control object. Further, continuity may be given to a static characteristic by means of a characteristic continuing part (d) to continue smoothly static characteristic step parts caused by a change in the duty driving frequency. |
