The utilization of exhaust gas recirculation (EGR) is a fundamental approach to the reduction in the nitrogen oxide emissions from engines that operate on lean fuel mixtures, particularly diesel engines. However, the return of a fraction of the exhaust gases back into the engine’s intake manifold, is likely to produce an adverse effect on the engine performance by degrading its power and economic indicators. To address this issue, therefore, the paper develops a more practical approach to optimize the diesel engine exhaust gas recirculation flow rate in order to reduce the nitrogen oxide content with minimum loss of power. A specific optimality criterion was established, and a three-input-factor experiment was successfully conducted. The optimization problem was solved allowing for the achievement of a minimum NOх content under all operating conditions in the selected mode of the engine.

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