Abstract

Analysis was conducted of knocking mitigation when using passive pre-chamber jet combustion as compared to a gasoline engine with stoichiometric spark ignition combustion. Jets emitting from the pre-chamber enabled the propagation flame to rapidly reach the bore end, shortening the combustion duration. This reduced the unburned area of end-gas in the latter half of combustion and mitigated knocking. It was also shown that by creating more nozzles and thus increasing the number of jets, the unburned field is partitioned and made smaller, which suppresses auto-ignition and mitigates knocking. It was confirmed that setting specifications to maximize the knocking mitigation effect and thermal efficiency can raise the compression ratio by 1.8 and increase thermal efficiency by 1.1 pts.

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Author (organization or company)

• Hirokazu ANDO
• Yusuke SHINTANI（Innovative Research Excellence Power Unit & Energy）
• Hiroki KOBAYASHI（Innovative Research Excellence Power Unit & Energy）
• Ryosuke SHIINA（Innovative Research Excellence Power Unit & Energy）
• Noritaka KIMURA（Innovative Research Excellence Power Unit & Energy）

Publication Information

Article of Honda R&D Technical Review Vol.35 (46 - 56)

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