| 摘要 |
Automatic transmission controls for use in an automotive vehicle which improves smoothness and reduces pumping losses in automatic shifting by modifying the hydraulic pressure to be applied to friction engaging device in accordance with the torque output of the vehicle engine during normal driving of the vehicle and in accordance with the torque transmitted from the vehicle at the time of engine braking. The controls include a regulator valve operable to extend the operating range to high engine speed and to increase the varying rate at low speed, a timing valve effective to control the engaging time of a servo-motor operated at the low speed, a shift valve being capable to impart hysteresis thereto, and an inhibitor valve being adapted to prevent transmission into the low speed driving condition only if the vehicle driving speed exceeds over a predetermined speed.
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