| 摘要 |
PURPOSE: A hydraulic pressure control system in an automatic transmission is provided to prevent an end clutch from being damaged and enhance shift feel by early operating the end clutch during a second to a third speed change and to enhance durability by preventing decompression of end clutch pressure during a third to a fourth and the fourth to the third speed change. CONSTITUTION: A hydraulic pressure control system contains a pressure adjusting device adjusting hydraulic pressure from an oil pump(4); a manual and an automatic control device forming a transmission mode; a hydraulic pressure control device adjusting shift feel and responsiveness for the easy formation of the transmission mode; a damper control device operating a torque converter(2) and a damper clutch; and a hydraulic pressure distributing device properly distributing hydraulic pressure to frictional factors as a force factor or a counter force factor. Then, an end clutch valve operates an end clutch during a second to a third speed change and supplies continuous third speed to the end clutch during a third to a fourth speed change. The end clutch valve is arranged on a third speed pipe(30) and controlled by an end clutch pressure.
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