Experimental investigations of gasoline partially premixed combustion with an exhaust rebreathing valve strategy at low loads

Abstract This paper investigates the combustion and emission characteristics using a commercial gasoline with Research Octane Number (RON) of 93 on a Partially Premixed Combustion (PPC) engine equipped with a Variable Valve Actuator (VVA) system. The effects of injection timing, internal exhaust gas recirculation (i-EGR) rate and intake pressure on combustion and emissions are studied. The i-EGR was achieved by an extra opening of the exhaust valve during the intake process. The study was conducted at an engine speed of 1500 r/min with cyclic fuel mass from 11.6 to 22.2 mg. The operating region for high-efficient, clean and stable gasoline PPC (i.e., COVimep

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