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Experimental Research on HCCI Using Gasoline and Diesel Blended Fuels
Shaohua Zhong, H Zhang, G. Jin, Mirosław L. Wyszynski, Hongming Xu
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Abstract
Gasoline and diesel, the two fuels with different properties and were blended as a fuel for HCCI operation. Gasoline fuel, with the features of high volatility, easy vaporization and mixture formation, is used to form the homogeneous charge. While diesel fuel with better ignitability is used to control autoignition and knocking in the HCCI environment. The combination of the two different fuels is expected to get good compromise in HCCI combustion. Experiments conducted with moderate compression ratios (10.4 and 15) and using two modes of HCCI control, i. e. intake heating and NVO (Negative Valve Overlap) received the expected results. With increasing proportion of diesel fuel in the blend, the requirement of intake temperature for knock-free HCCI operation was decreased. Excess air ratio range was extended and emissions of HC and NOx were greatly reduced over the HCCI operating range.