| 摘要 |
An automatic transmission system having a speed changing unit including a torque converter and speed-changing gear means, actuators for varying the meshing engagement of the gears, a hydraulic circuit for controlling the actuators, and an electronic circuit. In the apparatus, the electronic circuit computes the ratio between the rotating speed of the input shaft of the torque converter and the rotating speed of the input or output shaft of the speed-changing gear means to deliver an output signal which is used to actuate a distributing valve in the hydraulic actuating circuit to effect the changing of speed.
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