| 摘要 |
PROBLEM TO BE SOLVED: To accumulate an accumulator quickly by a line pressure after starting a driving source, and to enable actuation of a parking lock without hindrance by the hydraulic pressure accumulated in the accumulator even when the driving source stops in a short time after the start of the driving source.SOLUTION: A hydraulic circuit 31 of an automatic transmission, when a driving source is stopped, releases parking lock by supplying a hydraulic pressure accumulated in accumulators 37, 38 to a hydraulic actuator 25, and, when the driving source is started, accumulates the accumulators 37, 38 by a line pressure. In the case where a predetermined condition is established when the driving source is started, line pressure control means 44 increases the line pressure equal to or greater than the pressure necessary for full filling of the accumulators 37, 38, so that the accumulators 37, 38 come to a state of full filling in a short time by the high line pressure rising right after the start of the driving source, and even when the driving source stops again right after the start, the parking lock can be actuated without hindrance by the hydraulic pressure accumulated in the accumulators 37, 38.SELECTED DRAWING: Figure 8 |
