Abstract
Experiments have been carried out on a hydrogen direct-injection and gasoline port-injection engine at the conditions of locally rich hydrogen and lean-burn mode in order to study the effect of hydrogen fraction and air-fuel ratio on the engine’s emissions. The experiments results demonstrated that when the excess-air ratio was increased from 1 to 1.8, NOx and CO emissions were at least decreased by 91% and 95% respectively and HC emission was increased by 56%. Almost 23% reduction was observed in HC emission when hydrogen fraction changed from 3.9% to 10.5%, whereas the NOx emission has almost been tripled and CO emission is found to be less affected with hydrogen fraction.
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