Our world is experiencing rapid change with high consumption rate of fossil fuel from internal combustion engine usage from all of economy sectors. Reactivity controlled compression ignition (RCCI) engines are capable of producing high thermal efficiency while emitting less NOx and PM. To maximize combustion phasing, duration and magnitude, RCCI engine uses in-cylinder fuel blending with two different reactivity inclination. Using dual-injection strategy, Low Reactivity Fuel (LRF) can be introduce through Port Fuel Injection (PFI) system and Higher Reactivity Fuel (HRF) with greater latent heat of vaporization is injected through Direct Injection (DI) system. The HRF is injected before ignition the premixed fuel occurs through DI combustion chamber. The ignition causes the LRF and HRF mixture to ignite and causes the remaining gas to ignite. In-cylinder temperature and combustion temperature can be reduced because of cool flame effects. This paper will review the effect of PFI using gasoline, alcohol and natural gas and DI strategy where diesel, biodiesel is used. NG and alcohol fuel combination with one constant HRF offer more reactivity inclination compared to gasoline. Thus, in term of the engine management strategies, effect of engine advance and retard timing, injector pressure and various direct injection pulse also being reviewed. Higher fuel injection pressure leads to better combustion and fuel atomization. To date, research on the RCCI engine mode had conclude that with low and medium engine load, engine will able to produce almost 60% thermal efficiency and emitted lower NOX and PM emissions in comparison to a conventional diesel engine.

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