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캐니스터를 사용한 LPLi 엔진의 누설연료 저감에 관한 연구
최성원(Seongwon Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),한도(Doh Han),김현기(Hyun-Kee Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Liquid Phase LPG injection (LPLi) system has several advantages in more precise fuel metering and higher engine performance than those of the conventional type. On the other hands. leakage problem of LPLi system at the injector tip is a main obstacle for meeting more stringent future emission regulations because this phenomena might cause excessive amount of THC emission during cold and hot restart phase. The main focus of this paper is the development of leakage fuel recirculation system with activated carbon canister to eliminate the leaked fuel at intake system. Leaked fuel level was quantified using fast response THC analyzer. Finally, to confirm the adsorption efficiency of recirculation system in real LPLi vehicle, THC emission level was measured through FTP-75 mode. Vehicle test results shows that 70% of THC emission was reduced and stable engine operation was possible through suitable duty control.
활성탄을 이용한 액상분사 LPG엔진의 누설연료 제순환시스템에 관한 연구
명차리(Cha-Lee Myung),최성원(Seongwon Choi),박심수(Simsoo Park),한도(Doh Han) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Mechanical fuel supply system of conventional LPG engine is simple, but on the other hand it isn't good at accurate fuel control. From this reason, LPG engine vehicles have been showed a poor catalytic efficiency and low engine power characteristics. Thus, LPLi(Liquid Phase LPG injection) engine which equipped a electro controlled fuel supply system has been used for better engine performance and emission characteristics. But the fuel leakage phenomena of LPLi engine are still pointed out. Fuel which remained in fuel rail after engine stop is evaporated by heat transfer from engine body and leaked out through injector in a gas phases. Leaked fuel causes a rich mixture and makes a dense THC emission during engine start phase. To meet future stringent emission standards, THC emission during start phase must be reduced. This study devised a leakage fuel recirculation system. Leakage fuel recirculation system absorbs a leaked fuel with a activated carbon canister after engine stop and releases a fuel to engine intake manifold at next engine start.