Comprehensive analysis of combustion phasing of multi-injection HCCI diesel engine at different speeds and loads

Combustion in homogeneous charge compression ignition engines is normally complicated, so the heat release analysis is very significant as it is beneficial for controlling combustion phasing and developing combustion models. The experimental work was carried out on a turbocharged common rail diesel engine. The engine is a watercooled, 2.776 L, 4-cylinder, and 4-stroke with a multi-injection fuel system. The Apparent Heat Release Rate is computed from the measured in-cylinder pressure at various speeds and loads. The low- and high-temperature reaction events (start and end) and periods, calculated in-cylinder temperature and cumulative fuel burning rate are evaluated and analyzed in both engine crank-angle and time scales. A new correlation considering the effect of engine speed and load on low- and high-temperature reaction periods is proposed. A very good agreement between correlation-predicted and measured and has been achieved (R2 is greater than 0.95), which could be a useful tool in early design calculation, combustion modeling, and control.

Automated summary

Heat release analysis is crucial in homogeneous charge compression ignition engines for controlling combustion phasing and developing combustion models. Experimental work on a turbocharged common rail diesel engine is conducted to measure in-cylinder pressure and compute Apparent Heat Release Rate. The analysis includes low- and high-temperature reaction events, in-cylinder temperature, and cumulative fuel burning rate. A new correlation considering engine speed and load is proposed, showing excellent agreement between predicted and measured results.