A novel combustion evaluation method based on in-cylinder pressure traces for diesel/natural gas dual fuel engines

摘要: To better understand the combustion process of dual fuel engines, a novel evaluation method based on in-cylinder pressure traces was proposed in this study. Two parameters, standard deviation and coefficient variation, were calculated from measured at every crank angle. The profile shows that there is an obvious jump representing overall process. effect diesel injection timing that, by advancing timing, start initial then retarding trend. profiles or variation show change as pilot advanced. When later than 30°CA BTDC, rapid rise higher main peak with advancing. As further advanced, increasing trend while weakening trend; both them finally overlap together when earlier 40°CA BTDC.