Emissions in diesel engine with different rates of EGR

Resumo

© 2014 by Nova Science Publishers, Inc. All rights reserved.Diesel engines are not only among the most applicable internal combustion engines today, but they are also one of the biggest polluters. There is great concern, in particular, with the emissions of NOx and particulates; EGR (Exhaust Gas Recirculation) is among the techniques used to reduce NOx emissions. This technique involves, besides a detailed study of integrated devices, accurate calibration regarding the achievement of the ideal EGR rate. This is because in addition to the NOx emissions, particulate matter emissions should also be evaluated without losing sight of their performance parameters. This work will present a detailed experimental study carried out with ACTEON, a four-cylinder engine that meets Euro III emission standards. This engine has an urban application, i.e., it works most of the time at low rotational speeds. In this important, operating range, a high rate of EGR is required for emission levels to be met. Different EGR configurations were studied by varying the EGR rate from 2.5 to 28 %. The values of emissions and performance will also be presented. The definition of the study conditions was carried out after the application of the Design of Experiments (DoE) technique. Findings are detailed for the most critical operating conditions.

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