| 摘要 |
PURPOSE:To improve economization of fuel and to prevent generation of a speed change shock by properly setting line oil pressure according to a selected shift pattern. CONSTITUTION:A drain open-and-close valve 18 is connected to a pilot port 15 of a line oil pressure control valve 4, and in a power mode, an electric switch 24 is closed to close the drain open-and-close valve 18 to increase the upward force worked upon a spool 6 and enlarge a counter balance value of a spool 5, resulting in increasing the line oil pressure for the same stepping amount of an acceleration pedal as compared with an economy mode. Thus, line oil pressure can be set at a proper line oil pressure according to a selected shift pattern, which can avoid a loss of an auxiliary machinery by an oil pump. Accordinly, the economization of an engine fuel can be improved and the generation of a speed change shock can be prevented. |
