Effects Of Combustion Boundaries On Ethanol Fueled Homogeneous Charge Compression Ignition Combustion

Finding out a novel combustion process of petrol fuel and alternative fuels with higher heat efficiency and lower pollutant emissions than conventional engines has become one impending issue confronted to the engine researchers.Homogeneous Charge Compression Ignition (HCCI) is a different combustion mode comparing with conventional homogeneous charged and spark ignition gasoline engines and compressed ignition diesel engines. In this combustion mode the mixture, composing of the fuel, air and the recirculated exhaust gases (EGR), is compressed, auto-ignited, combusted. The HCCI engine is of high heat efficiency, which is approximately the same compared with diesel engines. What's more, the emissions of the NOx and PM are quite lower because of its unique homogeneous charge and low temperature combustion process. It is likely to surmount the limitations of heat efficiency and pollutant emissions of traditional diesel and gasoline engines and become the wide using combustion mode. Because of the advantages mentioned above HCCI combustion and its controlling technologies become a worldwide hot topic in the internal combustion engine researchers.This study is supported by National Program on Key Basic Research Project (973) 2001CB209202. The effects of combustion conditions on ethanol fueled Homogeneous Charge Compression Ignition (HCCI) combustion were thoroughly described in this paper.The experimental engine was established from CA6110 prototype diesel engine. First the inlet and outlet manifolds of 6th cylinder were separated from the other 5 cylinders in order to realize unattached air-intake, air-outlet and fuel supply. Moreover, the air-intake warm-up and EGR system of 6th cylinder were developed in order to provide variable combustion conditions.The key hardware and software of air-intake temperature controlling system were developed and validated by air-intake warm-up experiments.