The throttle position sensor is used to detect the throttle opening angle on the one hand, as a reference signal for the engine load, and on the other hand to reflect the speed of the throttle opening change, so as to reflect the driver's driving intention. For the electronic control system of the automatic transmission, the throttle position sensor is mainly used to detect the opening of the throttle, reflect the load of the engine, and serve as an important signal for the control of the shift timing.