In general, the required vehicle wheel speed and torque, engine speed and torque can provide a greater difference, and therefore need to change the transmission from the engine to the transmission ratio between the driving wheel, the engine power transmitted to the driving wheel of economic and easy to be able to adapt to changes in load and road conditions require.
In addition, parking, reversing, also achieved by the transmission system. Timely coordination of the working conditions of the engine and transmission, drivetrain full play the potential to achieve the best match, which is the fundamental task of variable speed control system.
Automatic transmission powertrain to internal and external according to the state, as well as driving conditions demand, automatically select the appropriate gear ratio, transmission with this function is called automatic transmission, divided into grade level and no change in transmission ratio two. In the automatic transmission during a class variable speed gearbox transmission ratio control, also known as shift control; and continuous stepless transmission ratio can change the gearbox, known as the continuously variable transmission (referred to as CVT) o have the ideal CVT the constant power transmission performance, speed the process of continuous smooth, no power interruption, the goal is that people have, and use of electronic technology, especially microelectronics control transmission system, has become the vehicle to achieve the main method of automatic transmission functions.
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