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The effects of recirculated exhaust gas on the characteristics of NOx, and soot emissions under a wide range of engine loads have been experimentally investigated by a four-cylinder, four-cycle, swirl chamber type, water-cooled automotive diesel engine operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas recirculation (EGR) control system for reducing NOx, and soot emissions simultaneously in diesel engines. The EGR system is used to reduce NOx, emissions. And a novel diesel soot-removal device with a cylinder-type scrubber which has five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The experiments are performed at the fixed fuel injection timing of 4˚ATDC regardless of experimental conditions. It is found that soot contents in exhaust emissions are eliminated by 40 to 70% with than without scrubber in the range of experimental conditions, and that NOx, emissions decrease markedly, especially at higher loads, while soot emissions increase because of the drop of intake and exhaust oxygen concentrations, and the rise of equivalence ratio as the EGR rate is elevated.

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UCI(KEPA) : I410-ECN-0101-2009-556-013999988