Study on the fuel rail temperature and pressure characteristics with LPG composition during hot restart condition of LPi engine with turbine type pump

터빈방식 펌프 LPi연료공급 시스템의 엔진 고온재시동 시 LPG 조성비에 따른 연료레일에서의 압력 및 온도특성에 관한 연구

Conventional LPG pump for Liquified Petroleum injection(LPi) engine has been adopted vane type. But the BLDC type fuel pump for LPi system has complicated structure and its price is high. Therefore, as a alternative, this study has mainly focused on the development of turbine type LPG pump which has lower cost and simple structure than conventional BLDC type. To verify the possibility of substitute the performance tests were performed for each fuel pump. The comparative items were pressure settling time, variation of fuel outlet temperature and engine performance of hot restart ability. As a result, performances of turbine type LPG pump were equivalent or high comparing to the BLDC type all over the tests for different fuel composition.