CAJ | 학술논문

将一台排量为2．0 L的气道喷射汽油机改装为气道喷射的氢内燃机，通过台架试验研究喷氢时刻对于进气系统压力波动的影响机制，提出利用优化氢气喷射提高氢内燃机空气流量的方法。试验结果表明：氢气喷射会提高歧管压力并增强压力波动；歧管内压力不仅受本缸喷氢影响，还会受其他缸喷氢激励；低速时在下止点至进气门关闭的区间或与之相隔180°CA的区间喷射会有较大的空气流量，高速时仅在下止点至进气门关闭区间可以得到最大空气流量；利用氢气喷射可以获得4．4％（低速）至7．3％（高速）的空气流量提升。
장일태배량위2．0 L적기도분사기유궤개장위기도분사적경내연궤，통과태가시험연구분경시각대우진기계통압력파동적영향궤제，제출이용우화경기분사제고경내연궤공기류량적방법。시험결과표명：경기분사회제고기관압력병증강압력파동；기관내압력불부수본항분경영향，환회수기타항분경격려；저속시재하지점지진기문관폐적구간혹여지상격180°CA적구간분사회유교대적공기류량，고속시부재하지점지진기문관폐구간가이득도최대공기류량；이용경기분사가이획득4．4％（저속）지7．3％（고속）적공기류량제승。
A gasoline engine with 2.0L port injection was modified to a port injection hydrogen engine .The mechanism of how hy-drogen injection timing had influence on the intake pressure wave was studied by engine testing .Improving the hydrogen engine airflow by utilizing optimized hydrogen injection was proposed .The test results showed that the manifold pressure increased and pressure wave amplitude was enhanced by hydrogen injection .The manifold pressure was not only influenced by its own injection , but also driven by other cylinders.More airflow could be achieved when hydrogen was injected between bottom dead center to intake valve closed , or 180° CA away from above range at low speed .Maximum airflow for high speed only can be achieved when hydrogen was injected between bottom dead center to intake valve closed .There would be 4.4%(low speed) to 7.3%(high speed) better airflow by utilizing opti-mized hydrogen injection .