Abstract

Fuel injection strategy has become the heart of modern diesel engine due to its better commend on combustion process which ensures improvement in performance (BSFC, torque) and combustion noise (CN) with simultaneous reduction of emissions. In this experimental research work, impact of quadruple (epMa), triple (pMa) and double (pM) injection strategies have been studied on a typical six cylinder low-temperature combustion (LTC) CRDI diesel engine. Experiments were conducted at five different speeds (low to high) and three engine load conditions (20%, 60% and 100% of maximum torque, respectively) with higher EGR fraction of 45% and fixed main injection timing (Crank angle) using conventional diesel (BS-IV) fuel. The comparative study shown that quadruple (epMa) injection strategy is superior to provide optimum (BSFC, overall emissions) results in comparison with triple and double injection strategies for all aspects. Smoke level is marginally higher at lower-speed range for quadruple injection scheduling, whereas NOx emission level is the lowest among the injection strategies. Quadruple injection is capable of reducing combustion noise around 2–3 dBA at low loads and speeds over other two injection strategies.

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