Hydraulic control system for vehicular automatic transmission with two accumulator control values to vary back pressure to accumulator to follow the change in engine torque
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United States of America Patent
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Aug 8, 1989
Grant Date -
N/A
app pub date -
Jul 29, 1985
filing date -
Jul 31, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Described herein is a hydraulic control system for vehicular automatic transmission, including an accumulator back pressure control circuit which is provided between a line pressure conduit and a back pressure supply conduit, and comprises a first accumulator control valve for dropping the line pressure according to the throttle opening, and a second accumulator control valve receiving an input pressure commensurate with the throttle opening and dropping the output pressure of the first accumulator control valve according to the throttle opening to apply to the piston of the accumulator a back pressure varying in corresponding to the engine output shaft torque.
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