An Experimental Study on the Effect of Direct-injection Ratio on the Combustion and Emission of Dual-injection Gasoline Engine
The test on a gasoline engine equipped with dual-injection system is conducted to investigate the effects of direct-injection ratio rDIon the combustion and emission of that engine with stoichiometric mixture under different load conditions. The results show that with the increase of rDI,the pressure and temperature in cylinder are almost kept unchanged when rDIis less than 40%,and they obviously fall when rDIis more than 40%;CO emission increases first and then decreases,and the trend of THC emission is just the opposite,while NOxemission constantly lowers. With the increase of rDI,the distribution of particle size changes from single peak to double peaks,and the total particle emission rises first then falls,the emission of accumulation mode particle constantly raises,while that of nucleation mode particle depends on load,and there is an optimal rDIto make it minimum. With the increase of load,all the emissions of particle and pollutant gases fall except NOx,which rises with load going up.
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