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Étude des émissions de particules d'un moteur à combustion interne de type allumage commandé

Abstract : Particulate emissions from a spark ignition engine are highly variable. The equivalent ratio of the air/fuel mixture is not sufficient to perfectly define the characterisation function of these emissions. Tests have highlighted the importance of the phenomenon of oil scavenging by the blowby gases on the particulate emissions. This is due to the position of the piston rings which rotate continuously around their grooves. The particle emission characterisation function was completed taking into account these new conditions. Then, the creation of a blowby gas simulation model in GTsuite allowed the characterisation of these flows and the understanding of these mechanisms. For example, at idle conditions, oil accumulates on the piston crown. Experimental tests confirmed the importance of the idling time on particle emissions. Finally, the impact of oil and oil filter ageing on particulate emissions was investigated. An "oil + filter" assembly aged under real conditions has a particle emission rate twice as high as a new assembly. Finally, this work has allowed to complete the particle emission characterisation function in order to be more in line with the real operating conditions of a spark ignition engine.
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Submitted on : Tuesday, May 31, 2022 - 12:06:13 PM
Last modification on : Thursday, November 17, 2022 - 4:48:10 PM

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  • HAL Id : tel-03682820, version 1

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Vincent Berthomé. Étude des émissions de particules d'un moteur à combustion interne de type allumage commandé. Thermique [physics.class-ph]. École centrale de Nantes, 2021. Français. ⟨NNT : 2021ECDN0054⟩. ⟨tel-03682820⟩

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