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In-cylinder optical measurement for analysis of control factor of ignition phenomena under diluted condition Hitachi
- Format:
- Book
- Conference/Event
- Author/Creator:
- Oryoji, Kazuhiro, author.
- Conference Name:
- SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2020
- Summary:
- To increase thermal efficiency of internal combustion engine, dilution combustion system, such as lean burn and EGR (Exhaust Gas Recirculation) system have been developed. These systems require spark ignition coils generating large discharge current and discharge energy in order to achieve stable ignition under diluted mixture condition. Several researches clarified that larger discharge current increases spark channel stretch and decreases possibility of spark channel blow-off and possibility of misfire. However, these investigations don't mention effect of larger discharge current and energy on initial combustion period. Then purpose of this research is to investigate relation among dilution ratio, initial combustion period and coil specification in order to clarify control factor of dilution limit. In this study, four coils having different current profiles were evaluated under 2000 rpm and 6 bar NMEP (Net indicated Mean Effective Pressure) under diluted mixture condition by combustion test and in-cylinder optical measurement test with research single cylinder engine. The combustion test results showed a correlation between dilution limit and initial combustion period. The optical measurement test showed that initial combustion period has a correlation with spark plasma stretch before 1st restrike and spark plasma stretch rate. Moreover, the optical test showed that variation of initial combustion period depends on temporal flow velocity change during discharge and long initial combustion period cycles are caused under slow velocity condition during discharge
- Notes:
- Vendor supplied data
- Publisher Number:
- 2020-01-2048
- Access Restriction:
- Restricted for use by site license
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