Automatic car principle
Since the range of the automatic torque converter of the torque converter is not large enough, several rows of planetary gears are connected in series behind the turbine to improve the efficiency, and the hydraulic control system automatically manipulates the planetary gears according to the change of the engine operation, thereby realizing the automatic shifting torque.
The automatic gear shifting of the auxiliary mechanism can not meet the various needs of driving, such as parking, retreating, etc., so there is also an intervention device that is a manual lever, the sign P (parking), R (back gear), N (neutral), D ( Forward), there are also additional gears of "2" and "1" in the forward gear for starting or uphill. Since the shifting region is divided into a plurality of shift ratio sections, which are only stepless in the prescribed shifting section, the AT is actually an automatic transmission between the stepped and stepless. Advantages and Disadvantages AT does not use clutch shifting, the gear position changes little, the connection is stable, so the operation is easy, which not only brings convenience to the driver, but also brings comfort to the rider.