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The aim in this study is to develop the combined turbo intercooler EGR system with a non-thermal plasma reactor for reducing exhaust emissions and improving fuel economy simultaneously in ECU common-rail diesel engines. At the first step, the characteristics of performance and NO_x THC emissions under four kinds of engine loads arc experimentally investigated by using a four-cycle, four-cylinder, direct injection type, water-cooled ECU common-rail diesel engine with a combined turbo intercooler plasma exhaust gas recirculation (EGR) system operating at three kinds of engine speeds. The EGR and turbo intercooler system are used to reduce NO_x emissions, and the non-thermal plasma reactor and turbo intercooler system are used to reduce THC emissions. In this study, the plasma system is a flat-to-flat type reactor operated by a plasma power supply. The fuel is injected by pilot and main injections at the variable injection timing between BTDC 15˚ and ATDC 1˚ regardless of experimental conditions. It is found that the specific fuel consumption rate with EGR is increased, but the fuel economy is better than that of mechanical injection type diesel engine compared with output. Results also show that NO_x emissions are decreased, but THC emissions are increased, as the EGR rate is elevated. NO_x and THC emissions are slightly decreased as the applied electrical voltage of the non-thermal plasma reactor is elevated. Thus one can conclude that the influence of EGR in NO_x and THC emissions is larger than that of the non-thermal plasma reactor, but THC emissions are greatly influenced by the nonthermal plasma reactor as the EGR rate is elevated.

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UCI(KEPA) : I410-ECN-0101-2009-556-014410186