The throttle positioning motor is generally a DC motor, and the control DC motor adopts pulse width modulation (PWM) technology, which is characterized by high frequency, high efficiency, high power density and high reliability. The control unit controls the rotation angle of the DC motor by adjusting the duty cycle of the pulse width modulation signal, and the motor direction is controlled by a return spring connected to the throttle.
The motor output torque is proportional to the duty cycle of the pulse width modulated signal. When the duty ratio is constant and the motor output torque is balanced with the return spring resistance torque, the throttle opening is unchanged; when the duty ratio is increased, the motor drive torque overcomes the return spring resistance torque, and the throttle opening degree increases; conversely, when the duty ratio decreases, the motor output torque and the throttle opening degree also decrease.
The engine control unit monitors the function of the system. If a fault is found, the system fault indicator will be illuminated to alert the driver that the system is faulty. At the same time, the electromagnetic clutch is separated and the electronic throttle is no longer controlled by the motor. The electronic throttle
valve returns to a small opening position under the action of the return spring, so that the vehicle can be slowly driven to the repair location for the maintenance personnel to inspect and repair.