Evaluation of composition and carbon atoms distribution of the exhaust hydrocarbons by varying post-injection parameters in DI diesel engine

This study was aimed to explore the effects of different post-injection parameters on cracking, formation mechanism, composition, and carbon atoms distribution exhaust hydrocarbon (HC) compounds diesel engine. The influence three fuel masses (PIM) six dwell duration with start injection (SOI) timings were assessed an operating speed 1000 rpm a basic engine load 0.5 MPa. Post-injection strategy greatly influenced composition gases emissions. It noted that light HC species lowered during early at SOI 20-40° crank angle (CA) due high in-cylinder temperature more oxidation but increased as delayed cracking fuel. An increase in PIM also all SOI. Peak values C1 (one carbon), C2 (two C3 (three-carbon) recorded 60°CA 15 mg respectively, maximum value 2700 ppm observed for non-methane (NMHC) 80°CA. While higher (C8) achieved peak 275 80°CA PIM. At 20-40°CA, lighter HCs concentration fractions accounted about 50–80% THC emissions 5–15 later 80-120°CA C8 dominant over other occupying fraction than 50% 5, 10,