Experimental Investigation in Homogenous Charge Diesel Combustion Engine for Simultaneous Reduction of NOx and Smoke

This paper deals with the study of experimental investigations on Homogenous Charge Diesel Combustion (HCDC) system. The study had been carried out in a four-stroke air- cooled single cylinder diesel engine of rated power 4.4 kW thereby converting a ceramic-coated diesel engine into HCDC mode by using a port fuel injector to create a homogenous charge. Electronic fuel injection circuit was developed to control the injection timing and duration of the premixed charge. Gasoline was premixed and port injected before ignition whereas the diesel fuel was injected by the conventional injector directly into the cylinder. Port injected gasoline and direct injected diesel were tested for various proportions to optimize the operating range without varying any existing engine parameters (unmodified engine). From the study conducted, it was found that oxides of nitrogen (NOx) and smoke emissions were reduced simultaneously at 40% premixed charge.