The demand for higher fuel economy and lower exhaust gas emissions of CI engine cannot be achieved by just using mechanically governed fuel injection systems. The electronically operated fuel injection system is the heart of a CI engine and has become one of the essential technologies to control critical in the recent years. High computing power of microcontrollers has made it possible for controlling injection of fuel electronically at any injection pressure, any crank angle and for any duration during the engine operation. A newer concept of RCCI operation further reduces the particulate matter and NOx emission to almost zero level with slightly higher BTE. Hence, there is a need to discuss the performance, combustion and emission of RCCI engine fuelled with alternative fuels and this paper presents an exhaustive review on these aspects.
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