Some Effects on AT Vehicle's Sudden Acceleration due to Stepping Motor for Compensation of Idle Speed

공회전속도 조절용 스텝모터가 AT차량의 급발진 현상에 미치는 영향

This study is carried out to make clear the reason of occurrence of sudden acceleration incident of AT vehicle. The stepping motor is used to control the engine speed at idle by compensating the volume of air. By the way it's valve is contaminated by blow-by gas, deposit and back fire etc. This contamination could occur the load of motor at low temperature. This plays an important role in damaging the motor's coil with the motor's performance interfered. If it's coil is damaged the ISC could malfunction. If these phenomena occur, the speed of engine may increase or the engine may stall with hunting.