Experimental investigations on the influence of higher injection pressures and retarded injection timings on a single cylinder CRDi diesel engine

Abstract

ABSTRACT Improved engine exhaust emissions with little or no deterioration in performance may be achieved through the use of new technologies and/or modifying the engine hardware. Present paper details the attempts of an experimental evaluation of Kirloskar make TV1 type diesel engine equipped with common rail direct injection (CRDi) and electronic control unit (ECU). It is established that retarded injection timing and smaller fuel droplets simultaneously reduce NO x and smoke emissions of a typical diesel engine. Hence engine testing was carried out using diesel fuel at 1500 rpm, under 50–100% of full load brake power, at various retarded injection timings and higher injection pressures. Reduced ignition delay, improved combustion, and simultaneous reduction in oxides of nitrogen and smoke emissions with modest deterioration in performance are observed when the engine is operated at 500 bar injection pressure and at an injection timing of 16° before the top dead centre.