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Huynh Thanh Cong,강준경(Joonkyoung Kang),노기철(Kichol Noh),이종태(Jongtai Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to develop an external mixture type hydrogen engine with high performance, the characteristics of performance and combustion are investigated for various valve overlap period by using Hz engine installed a mechanical continuous variable valve timing system. In experiments, valve overlap periods are analogically varied for 0° to 400°CA by 10°CA with the same amount of supplied energy as valve overlap period of O°CA, fuel-air equivalence ratio of 0.3 to backfire limit equivalence ratio. The obtained results show that by using a similarly low supplied energy, the tendencies of the basic qualitative performance and combustion characteristics are similar to conventional engines using petroleum fuel, but quantitative results give a little difference. The backfire limit equivalence ratio (defined as the upper limit of fuel-air equivalence ratio just before backfire occurs) was also improved significantly with decrease of valve overlap period and/or for operating conditions with the same amount of supplied energy.
흡기밸브 열림 시기에 의한 흡기관분사식 수소기관의 역화억제
이광주(Kwangju Lee),Huynh Thanh Cong,강준경(Joonkyoung Kang),이종태(Jongtai Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to certify the control of back-fire in the hydrogen-fueled engine with external mixture by intake valve timing, the characteristics of combustion are experimentally studied with change of intake valve opening timing at the fixed exhaust valve closing timing. As the results, when the intake valve opening timing is retarded, back-fire limit equivalence ratio is increased, and as expected, back-fire does not occurred from TDC. In addition, the timing of the best performance without back-fire is shown when the exhaust valve closing timing is 10° ATDC and the intake valve opening timing is TDC.