In order to have an in-depth understanding of the accelerator pedal position sensor of the electric vehicle, the brake pedal position sensor is integrated into a training box. The dynamic action demonstration of each sensor truly reproduces the working principle and action process of the accelerator pedal position sensor and the brake pedal position sensor. Gradually press down the accelerator pedal. At this time, the speed of the motor is gradually increased. Observe the values of the two voltmeters corresponding to the accelerator pedal position sensor and find that the value gradually increases. Gradually release the brake pedal, the voltage value corresponding to the two position sensors is gradually smaller. Observe the change of the speedometer when manipulating the accelerator pedal above. Set the fault to the 6 lines of the accelerator pedal position sensor respectively, and find that any one of them is affected, and one of the two accelerator pedal position sensors must be affected, which is reflected in the corresponding accelerator pedal position sensor voltmeter. When accelerating to a certain speed or starting creep state, press the brake pedal and find that the speed will drop significantly until it reaches zero. While the brake pedal is depressed, the left and right brake lights and the high brake lights are illuminated at the same time to warn the rear vehicle. The brake switch uses the normally open contact to control the brake indicator. When there is no brake, the brake indicator and the power supply are in an open state, and the brake is turned on.