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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.