Abstract
A thermodynamic analysis of the combustion and emission formation processes was investigated by the prediction of combustion characteristics and nitric oxide concentration in direct injection type diesel engine. This study describes the influence of combustion parameters on the nitric oxide emission such as injection timing, engine speed, fuel injection rate, and compression ratio of test engine. In order to determine the reduction factors of nitric oxide concentration, the kinetic mechanism for the formation of nitric oxide emission was used. As a result, the retardation of injection timing and decreases of engine speed reduce the nitric oxide concentration of exhaust emission. The influence of injection rate and compression ratio on the exhaust emission diesel engine are discussed.