ASPECTS OF USING HYDROGEN IN SI ENGINE

The paper presents the results of research’s carried on the SI engine, fuelled with hydrogen by direct injection method. Using this fuelling method are avoided the abnormally hydrogen combustion phenomena’s, achieving ~30 % engine power increase. Hydrogen engine runs with engine load qualitative adjustment. This provides a higher engine efficiency at low loads, the best results was obtained for λ=2…4. Are presented the influences of the mixture quality on burning process, on polluting and energetically engine performance. Because of the higher combustion temperature the NOx emission level is higher for λ=1…2 comparative to gasoline fuelled engine, but decrease a lot forλ>2.