| 摘要 |
In order to reduce the amount of time until the oil pressure actually changes in oil pressure chambers of various hydraulic devices (7, 8, 14) incorporated in a continuously variable transmission device, after a signal is transmitted to solenoid valves (19, 23, 24) for adjusting the oil pressure in these oil pressure chambers, the solenoid valves (19, 23, 24) adjust the oil pressure in the oil pressure chambers, which communicate with oil pressure introduction passages in which the solenoid valves (19, 23, 24) are provided, by adjusting the degree of opening set in response to the duty cycle, that is, the percentage of time the solenoids are energized per unit time. When the degree of opening of the solenoid valves (19, 23, 24) changes so as to exceed a prescribed value, up to a desired degree of opening with which the oil pressure in the oil pressure chambers can be adjusted to a desired value, a controller (16) for controlling the solenoid valves (19, 23, 24) adjusts the degree of opening of the solenoid valves (19, 23, 24) in correspondence with the direction of this change and exceeds the desired degree of opening, up to a state in which the degree of opening of the solenoid valves (19, 23, 24) has changed as greatly as possible, and after a prescribed amount of time has elapsed, the controller returns the degree of opening of the solenoid valve (19, 23, 24) to the desired degree of opening. |
