Effects of EGR and Ignition Timing on In-Cylinder&nbsp;Combustion Process of Atkinson Cycle
Engine

doi:10.3969/j.issn.1001-2222.2025.06.004

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (6) : 22-28. DOI: 10.3969/j.issn.1001-2222.2025.06.004

Effects of EGR and Ignition Timing on In-Cylinder Combustion Process of Atkinson Cycle Engine

SHU Jun^1,2,HE Siyue¹,HUANG Jianxiang¹

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Abstract

Based on experiments conducted on an inline three-cylinder Atkinson cycle gasoline engine designed for hybrid applications, the CFD model of in-cylinder combustion under dual injection was developed for a common hybrid engine according to the operating conditions of 2 000 r/min and 0.6 MPa. The model was further validated for accuracy. Then the ignition timing sweep simulations were carried out under conditions of no EGR and 7% EGR rate to investigate the comprehensive effects of varying EGR rates on combustion and emissions in the Atkinson cycle engine. The results showed that the introduction of EGR increased the average tumble ratio by 0.05, reduced the turbulent kinetic energy during combustion, extended the ignition delay period by an average of 5° and prolonged the combustion duration by an average of 10°. Furthermore, EGR reduced NOx emissions by over 80%, but doubled the increase of CO emissions. Ignition timing had little effect on the tumble ratio and turbulent kinetic energy. Under the 7% EGR condition, increasing the ignition advance angle led to a smaller increase in NOx and a more significant reduction in CO emissions.

Key words

exhaust gas recirculation / ignition timing / combustion process / Atkinson cycle

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SHU Jun, HE Siyue, HUANG Jianxiang. Effects of EGR and Ignition Timing on In-Cylinder Combustion Process of Atkinson Cycle Engine[J]. Vehicle Engine. 2025, 0(6): 22-28 https://doi.org/10.3969/j.issn.1001-2222.2025.06.004