Late direct fuel injection for reduced combustion rates in a gasoline controlled auto-ignition engine
| Autor: | Henryk Komsta, Jacek Hunicz, Maciej Mikulski, Michał Gęca, Paweł Kordos |
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| Rok vydání: | 2018 |
| Předmět: |
lcsh:Mechanical engineering and machinery
020209 energy Nuclear engineering 02 engineering and technology Low temperature combustion controlled auto-ignition Combustion Direct fuel injection mixture stratification direct fuel injection Mixture stratification internal combustion engine 0202 electrical engineering electronic engineering information engineering lcsh:TJ1-1570 Gasoline Valve timing Renewable Energy Sustainability and the Environment Homogeneous charge compression ignition Combustion analysis Single-cylinder engine Internal combustion engine Fuel injection low temperature combustion Environmental science Controlled auto-ignition |
| Zdroj: | Thermal Science, Vol 22, Iss 3, Pp 1299-1309 (2018) Thermal Science, 3, 22, 1299-1309 |
| ISSN: | 2334-7163 0354-9836 1299-1309 |
| DOI: | 10.2298/tsci180224145h |
| Popis: | Homogeneous charge compression ignition concepts despite high efficiency and ultra-low nitrous oxides emissions, suffer from week controllability and load range limited by excessive pressure rise rates. In the present work, controlled auto-ignition is achieved via direct injection of gasoline into the exhaust gasses recompressed during negative valve overlap phase. Single cylinder engine experiments are designed to explore the potential of additional late post injection strategies for pressure rise rate and peak pressure suppressing. For two mixture strengths, fuel distribution is varied between 3 gasoline injection events. In-depth combustion analysis is supported by emission measurement results. Increasing the amount of gasoline, post-injected during the main compression event, was proven to be an effective measure for reducing pressure rise rates, with over 50% reduction potential. The regulation capability however, is limited by typical tread-offs between stratified and homogenous fuelling concepts. Using post injection strategy results in decreased hydrocarbon emissions, but causes rapid increase in carbon monoxide and particulate matter emissions. Nitrous oxide increase rate is dependent on mixture strength with significantly higher sensitivities during lean operation. © 2018 Society of Thermal Engineers of Serbia. |
| Databáze: | OpenAIRE |
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