Abstract
The European emission standards EURO 5 and EURO 6 define more stringent acceptable limits for exhaust emissions of new vehicles. The Exhaust Gas Recirculation (EGR) system is a partial but essential solution for lowering the emission of nitrogen oxides and soot particulates. Yet, due to a more intensive use than in the past, the fouling of the EGR system is increased. Ensuring the reliability of the EGR system becomes a main challenge. In partnership with PSA Peugeot Citroen, we designed an experimental setup that mimics an operating EGR system. Its distinctive features are (1) its ability to reproduce precisely the operating conditions and (2) its ability to measure the temperature field on the heat exchanger surface with an Infra Red camera for detecting in real time the evolution of the fooling deposit based on its thermal resistance. Numerical codes are used in conjunction with this experimental setup to determine the evolution of the fouling thickness from its thermal resistance.
Highlights
The European emission standards EURO 5 and EURO 6 define more stringent acceptable limits for exhaust emissions of new vehicles [1]
By re-circulating a fraction of the engine exhaust gas back to the engine cylinders, the Exhaust Gas Recirculation (EGR) leads to a better nitrogen oxides (NOx)/soot particle compromise after combustion
We discuss how the formation of deposits that are similar to those obtained at PSA Peugeot Citroën during engine test bench cycles allows validating our experimental setup
Summary
The European emission standards EURO 5 and EURO 6 define more stringent acceptable limits for exhaust emissions of new vehicles [1]. The Exhaust Gas. Recirculation (EGR) system is a partial but essential solution for lowering the emission of nitrogen oxides (NOx) and soot particles. By re-circulating a fraction of the engine exhaust gas back to the engine cylinders, the EGR leads to a better NOx/soot particle compromise after combustion. This strategy of pollution reduction is completed downstream by (1) a.
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