HYDRAULIC CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

PURPOSE:To properly control a rapid charging time by increasing an oil amount in an initial time of hydraulic pressure supply to a clutch chamber of an automatic transmission for realizing rapid charging. CONSTITUTION:An oil supply amount is adjusted by duty driving a solenoid valve 3. A duty signal is so supplied that the solenoid valve 3 is opened at most in an initial time of transmission. Oil is rapidly charged to a clutch 4, and a piston of a clutch is quickly stroked. The rapid charging time is set shorter as a throttle opening gets larger, and as an oil temperature is increased. The rapid charging time is properly set in accordance with variation of line pressure.