2021 Fiscal Year Final Research Report
A study about ignition of lean mixture enhanced by spark discharge channel control
| Project/Area Number |
19K04233
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Chiba University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 火花放電 / 着火 / 点火 / 希薄燃焼 / 暖機過程 / 遅角燃焼 |
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| Outline of Final Research Achievements |
To investigate the effect of spark discharge characteristics on ignition stability under retarded ignition timing during catalyst warm-up condition and ignition with the diluted mixture and enhanced in-cylinder flow condition, combustion analysis and the visualization of gnition and combustion were conducted using three types of ignition coils with different discharge characteristics. It was found that under diluted conditions, the lean limit can be extended using the ignition coil with the increased discharge current and energy because the blow-off of the discharge channel is suppressed. On the other hand, under the catalyst warm-up condition, the combustion stability deteriorated with the ignition coil with a short discharge period, and the ignition stability can not be improved even if the ignition current and energy were increased. This implies that a longer discharge duration is effective for improving the ignition stability with the retard ignition timing.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
内燃機関の高効率化技術である希釈燃焼，実走行時に問題となる始動・暖機過程における着火安定性の向上を可能とする知見が得られており，ハイブリッド車両を含めた乗用車の燃料消費削減につながる制御技術に応用可能な成果が得らえており，工学的な価値が高い．
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