Pre-injection strategy for pilot diesel compression ignition natural gas engine

For pilot fuel compression ignition natural gas (CING) engine, pre-injection strategy of pilot fuel is an important ways to improve engine performance, emissions and combustion. In this study, effects of pre-injection parameters on combustion and emissions performance were experimentally studied in a pilot diesel CING engine which was modified from a turbocharged six-cylinder diesel engine. The cylinder pressure, heart release rate (HRR), start of combustion (SOC), duration of combustion (DOC) and coefficient of variation (COVIMEP), as well as NOx and HC emissions were analyzed. The results indicate that early pre-injection mode leads to lower cylinder pressure and HRR due to decrease of combustion intensity, and thereby lower NOx emission is obtained. In contrast, closely pre-injection timing leads to largely strengthening in combustion which is not beneficial for improving NOx emission performance.

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