In addition, parking, reversing, etc. are also realized by the transmission system. Coordinating the working conditions of the engine and the transmission system in a timely manner, giving full play to the potential of the power transmission system, and making it the best match is the fundamental task of the transmission control system. ECAT can automatically change the position of the shift lever after calculation and judgment according to the engine load, rotational speed, vehicle speed, brake working state and various parameters controlled by the driver, and accurately control the gear ratio according to the shifting characteristics, so as to realize the transmission shifting. The best control, the best gear and the best shift time.