차량 로드 덤프 펄스 과도현상에 의한 전기적 방해 현상 분석

Abstract

In this study, we propose both a methodology and a model for predicting the output signal obtained by applying ISO 16750-2 load dump pulses to a vehicle and vehicle components. Vehicle load dump pulses transiently occur in the event of a discharged battery being disconnected while the alternator is generating a charging current, with other loads remaining on the alternator circuit. In such cases, this current instantaneously flows into the other electrical component connected through the power line of the alternator. As such a vehicle load dump transient pulse is a signal having a large amount of energy, it is necessary to take precautionary measures at the development stage with respect to the main factors causing malfunctions of the electrical equipment. To do this, we have designed an equivalent circuit of the load dump pulse generator and simulated virtual loads using software with an analysis function to predict the pulse signal applied to the load. The simulated results for an automobile washer motor were compared with actual experimental results obtained through the actual load dump pulse generator; the maximum voltage, rise time, and pulse width were predicted when the load dump pulse was applied. This paper shows that it is possible to establish countermeasures for electrical disturbances from the vehicle load dump transient pulse in the actual product development and research stage.