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Comparison of combustion characteristics of an automotive CRDI engine with conventional HCV engine

In this present work, combustion parameters of an automotive CRDI diesel engine was investigated. A three cylinder CRDI passenger car engine employed with split injection pattern was tested at two different operating conditions namely, operating the engine at different speeds by maintaining a constant engine torque and also at different torques by maintaining a constant engine speed. Variation of combustion parameters of the engine was presented as function of BMEP, speed and torque. The variation of cylinder pressure and heat release rate of the CRDI engine was compared with a four stroke, six cylinder, heavy commercial vehicle (HCV) direct injection automotive engine employed with mechanical fuel injection system and significant variation was observed between the two. In the CRDI engine the magnitude of the cylinder pressure varied marginally during the combustion period when compared with mechanical fuel injection engine and the effect of split injection was observed in the heat release curve of the CRDI engine. Variation of start of combustion, peak pressure, maximum rate of pressure rise, maximum heat release rate and combustion duration with respect to speed and torque was presented for CRDI engine. [Received: May 23, 2016; Accepted: June 7, 2017]