| 摘要 |
PURPOSE:To improve a responsive property to speed change and prevent shocks in speed change while improving miniaturization, weight reduction, efficiency and a responsive property to control in line pressure control in a hydraulic control system of an automatic transmission. CONSTITUTION:Line pressure is controlled by the direct electronic control of cam ring eccentric pressure to a variable volume vane pump (c). Also, a line pressure-in-speed-change control means (j) for increasing the cam ring eccentric amount immediately upon inputting a speed change command and a hydraulic speed change control means m for practicing the speed change upon waiting the passage of a predetermined time lag from the speed change command are provided. |
