To investigate the actual emission potential of homogeneous charge compression ignition (HCCI) a EU4 full-size engine was optimized for vehicle compliant operating conditions. Results from a single cylinder engine with fully variable valve train helped to identify operation strategies and hardware requirements. To reach both sufficient amount of intake air and high EGR, a 2-stage turbo charging system was obstructed. Homogeneous concepts need feedback combustion and noise control based on the measured cylinder gas pressure. This can be performed with a glow-plug sensor which allows high-temperature glow during engine warm-up at the same time. The latter is very important, too because HCCI-success strongly depends on solving the severe HC/CO-problem. After-treatment of unburned HC with a Diesel oxidation catalyst (DOC) is limited because of low exhaust gas temperatures and partially high methane emission. To fulfil dynamic demands transient operation was controlled using cylinder pressure sensors. Despite the great NO(x)/soot-advantage HCCI combustion shows strongly increased HC/CO-emissions. HC species fractions were examined by means of mass spectroscopy. A catalyst upstream the turbo system (PTC) shows significant potential to improve DOC-activity and thus tailpipe emissions.
Homogeneous diesel combustion challenges under vehicle compliant operating conditions
2008
11 Seiten, 7 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
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