Abstract
Automatic transmission is the main part of the vehicle driving system, so it has much influence on the performance of the vehicle. Control system detects the throttle valve opening and vehicle speed signal, according with certain shift schedule it sends electronic signals, which control shift valve and realize automatic shift. In order to insure the smooth shift,pressure regulating and flow control system is adapted to control oil pressure changing curve of the applying elements. The transmission system with electronic systems control can achieve automatic control of power transmission, give full play to the characteristics of the engine to achieve optimal control of powertrain.
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