Print Email Facebook Twitter Late direct fuel injection for reduced combustion rates in a gasoline controlled auto-ignition engine Title Late direct fuel injection for reduced combustion rates in a gasoline controlled auto-ignition engine Author Hunicz, J. Mikulski, M. Geca, M.S. Kordos, P. Komsta, H. Publication year 2018 Abstract 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. Subject Controlled auto-ignitionDirect fuel injectionInternal combustion engineLow temperature combustionMixture stratification To reference this document use: http://resolver.tudelft.nl/uuid:dfb381de-8e08-4d81-a6e4-d34845db3a50 DOI https://doi.org/10.2298/tsci180224145h TNO identifier 842141 Publisher Serbian Society of Heat Transfer Engineers ISSN 0354-9836 Source Thermal Science, 22 (3), 1299-1309 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.