Method and device for controlling waste gas bypass valve

The invention relates to a method and device for controlling a waste gas bypass valve, and belongs to the field of automobile electronic control. The method comprises the steps that the number of times that the waste gas bypass valve works under a target working condition is obtained, and when the waste gas bypass valve works under the target working condition, the switching frequency of the valve body of the waste gas bypass valve exceeds a frequency threshold value; when the number of times exceeds a number-of-times threshold value, the rotating speed of the automobile is monitored; when it is monitored that the rotating speed of the automobile is lower than a rotating speed threshold value, the valve of the waste gas bypass valve is closed through the motor, and a voltage signal generated by the position sensor is monitored in real time; when it is monitored that the voltage signal generated by the position sensor remains unchanged, determining the voltage signal currently generated by the position sensor