Mazda Technical Review
Online ISSN : 2186-3490
Print ISSN : 0288-0601
Technical Reports
Study of Compression Auto-Ignition Control Method Using Flame Kernel
Ryohei OnoShun OsawaSekiyou KatsuKeisuke OkihamaYuji HaradaHidefumi Fujimoto
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RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS

2020 Volume 37 Pages 98-103

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Abstract

While compression auto-ignition enabling lean burn combustion is effective for improving the efficiency of the internal combustion engine, controlling ignition timing and combustion duration are major challenges. In this study, we considered enhancing the combustion control by using an electric discharge which forms a flame kernel. When an electric discharge occurred in lean air-fuel mixture under a low pressure condition, we observed a flame kernel formed, unburned gas near the kernel heated, and then the flame going out. And when an electric discharge occurred during an intake stroke in a single-cylinder engine, we observed the auto-ignition timing advanced despite a longer time passes from electric discharge to compression auto-ignition. Then we performed a detailed chemical reaction analysis simulating an experiment to analyze the factors of this phenomenon. The result of analysis suggested that part of the fuel in unburned gas, which had been heated up by the kernel, was cleaved and generated chemical species, which survived until the latter half of engine cycle and induced compression auto-ignition. It also indicated that among the chemical species generated by the cleavage, HO2, in particular, greatly affected the effect of advancing of ignition timing.

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