| 摘要 |
<p>An automatic transmission comprises a mechanical transmission 11, gear synchronizers 22 and 23, and a clutch 12 which have been automated by the addition of electro- mechanical and pneumatic operators 15, 18, and 21 and an electronic control system 24. The control system receives operator commands regarding the mode of operation, which can be automatic or manual, and monitors throttle position, engine speed, transmission countershaft speed (representing transmission input speed) and transmission output shaft speed representing vehicle speed). By utilising this information, the control system 24 selects the optimum gear ratio, effects synchronization of the selected transmission gear elements, controls clutch engagements and shuts off the fuel supply in accordance with a logic program. In selecting the optimum gear ratio, the control system changes the engine speed at which a shift is commanded in accordance with vehicle acceleration and deceleration (derived from the output shaft speed), and also in accordance with the differential of a signal representing throttle position, and in accordance with the direction of the previous shift. <IMAGE></p> |
