| 摘要 |
PURPOSE:To provide a hydraulic pressure control method by which when an oil-feeding/discharging means is driven in a prescribed duty factor, the driving time thereof can be accurately determined. CONSTITUTION:For example, consider the case where a solenoid valve 11 whose duty factor is controlled in a period of 50Hz (20msec) is operated for subjecting a hydraulic clutch 33 to play-filling operation, and thereafter the solenoid valve 11 is continuously driven in a duty factor D1 (35%). The play-filling time Tf (90msec) read in the step S60 is divided by 20msec, and the quotient 4 and the remainder time 10msec is obtained (step S61). Then, the duty factor Dc (50%) corresponding to the remainder time 10msec, and the duty factor Du (85%) obtained by adding 35% thereto are obtained (steps S62, and S63). After the solenoid valve 11 has been driven at the duty factor of 100% as many as 4 cycles, it is continuously driven at the duty factor of 85% as many as 1 cycle (steps S66, and S67) for carrying out play-filling operation. |
