| 摘要 |
PURPOSE:To improve the stability of line pressure control based on feed-back control irrespective of travelling and running requirements while improving miniaturization, lightening, efficiency and a responsive property to control in a line pressure controller of an automatic transmission. CONSTITUTION:While line pressure is controlled by direct electronic control of cam ring eccentric pressure to a variable volume vane pump (c), a control mode changing-over means j for selecting open control in place of feed-back control when actual or required control gain is judged to be got out of a converging range of feed-back control response according to travelling and running requirements is provided. |
