궤도차량 엔진의 저온 시동성 개선 사례 연구

Abstract

The cold start requirement of most vehicle is -32℃. So most vehicle system provides starting aid devices as water preheating system and auxiliary power unit (single cylinder engine) to prevent battery discharging problem during long starting time. Cold start-ability is performed under several severe condition, limited starting times and limited operating time of starter, 8hrs maintain time under full soaking temp condition. Limited heating condition and so on those environments are clearly stated in the system-specifications. There are various approaches to improve cold start-ability. Preferentially combustion optimization is most easy approaching method through fuel injection quantity, pressure and multiple injection control and hardware point of view, we introduced the change of the oil storage position by the application of the Oil anti-drain valve in this work which can reduce the starting load by bringing up the effect of oil heating through the preheating condition. This improvement model was applied in engine development and improved outstanding achievement in cold start-ability and this is also applicable to similar systems as extendibility.