THERMAL SCIENCE

International Scientific Journal

Jacek Hunicz

,

Maciej Mikulski

,

Michal S. Geca

,

Pawel Kordos

,

Henryk Komsta

LATE DIRECT FUEL INJECTION FOR REDUCED COMBUSTION RATES IN A GASOLINE CONTROLLED AUTO-IGNITION ENGINE

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.
KEYWORDS
internal combustion engine, low temperature combustion, controlled auto-ignition, direct fuel injection, mixture stratification
PAPER SUBMITTED: 2018-02-24
PAPER REVISED: 2018-04-11
PAPER ACCEPTED: 2018-04-18
PUBLISHED ONLINE: 2018-05-12
DOI REFERENCE: https://doi.org/10.2298/TSCI180224145H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 3, PAGES [1299 - 1309]
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Late direct fuel injection for reduced combustion rates in a gasoline controlled auto-ignition engine

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence