HCCI , SI HYDROARBONE SPECIATION GDIA qualitative and quantitative analysis of toxic but currently non-regulated hydrocarbon chemical species ranging from C5 – C11 was studded which is generated from a modern gasoline direct injection (GDI) engine by using gas chromatography-mass spectrometry (GC – MS). The GDI engine has been operated under different engine speeds and different engine modes (SI and HCCI modes). HCCI has the ability to operate on lean combustion which leads to the reduction in engine pumping losses, and fuel consumption However, HCCI mode has a high levels of unburnt HCs which leads to present heavier species such as Toluene, which is presented in higher concentrations under stoichiometric HCCI engine operation mode, while species such as , benzene, are mainly found in the engine exhaust during SI engine operation, Engine speeds has high impact on engine tail pipe emissions for both engine modes.. increasing engine speed leads to higher concentration in
Benzene species while toluene was decreased and presented in higher concentration at low engine speed for both engine modes.
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