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What is an automatic transmission?

automotive automatic transmission, the automatic transmission can be changed in accordance with road conditions torque. With respect to the automatic transmission is a manual transmission occurs, is capable of automatically shifting device according to the vehicle speed.

1. The automatic transmission Principle

works AT AT driveline torque converter is driveline, a planetary gear and hydraulic control system components, and the combination of hydraulic transmission gear way to achieve variable speed torque.
Since the area which is divided into several transmission section speed ratio, and only in a predetermined section of the transmission is stepless, therefore actually an AT automatic transmission interposed between the stepped and stepless.
The basic control principle works AMT AMT Transmission driveline are: ECU according to the operating state of the manipulation of the driver (throttle pedal, a brake pedal, a steering wheel, gear selector’s manipulator) and the vehicle (vehicle speed, engine speed, transmission input shaft speed) comprehensive judgment, and the road conditions to determine the driver’s intention, with the corresponding control law, the control commands issued, by means of respective actuators, the vehicle power train joint manipulation.
CVTCVT transmission system using the principle of a variable pulley groove width of the belt and power transmission, i.e. when the pulley groove width changes, a corresponding change in the contact radius of the driving wheel and the driven wheel of the variable speed belt, rubber belt generally with a metal strip and metal chain.

2. How automatic transmission maintenance and repair

Maintenance and automatic transmission should always check the oil level is normal.

· master the automatic transmission fluid replacement cycle.

· correctly replace the gearbox oil.

· automatic transmission oil change.
· repair automobiles with every 50,000 km, and the power supply connected to the car, to use the device and supporting the transmission joint in contact with the cooling tube.
Then, in the engine idling state, the automatic transmission is added detergent, feet slam the brakes, replace one gear of the automatic transmission, to remove harmful substances, and then fully replace the automatic transmission apparatus by means of a fluid.

· protecting agent blended with the automatic transmission to the automatic transmission, the addition ratio of 5 percentage.

– the film deposition and the like can be completely discharged within the automatic transmission system, to avoid contamination of the new ATF fluid.

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