Improvement of Natural-gas HCCI Combustion by Internal EGR by Means of Exhaust Valve Re-opening

Improvement of Natural-gas HCCI Combustion by Internal EGR by Means of Exhaust Valve Re-opening

To control natural-gas HCCI combustion, internal exhaust gas recirculation (EGR) by exhaust valve reopening (EVRO) during the induction stroke was applied to a single-cylinder test engine. The results demonstrate that combustion phasing can be controlled successfully by adjusting the EGR ratio, and...

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Veröffentlicht in:SAE International journal of engines 2009-01, Vol.2 (2), p.733-739
Hauptverfasser: KAWASAKI, Kiyoshi, HIROTA, Kazuki, NAGATA, Shingo, YAMANE, Koji, OHTSUBO, Hiroyuki, NAKAZONO, Toru
Format: Artikel
Sprache:eng
Schlagworte:
Combustion
Engine valves
Exhaust gases
Heat recovery
Natural gas
Safety valves
Test engines
Thermodynamic efficiency
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Zusammenfassung:To control natural-gas HCCI combustion, internal exhaust gas recirculation (EGR) by exhaust valve reopening (EVRO) during the induction stroke was applied to a single-cylinder test engine. The results demonstrate that combustion phasing can be controlled successfully by adjusting the EGR ratio, and so improvement of thermal efficiency and reduction in unburned exhaust emissions are feasible. In addition, the results of the EVRO method were compared to those of intake-valve pilot opening (IVPO) during the exhaust stroke. It was shown that EVRO is more useful than IVPO as a heat-recovery method for HCCI combustion.
ISSN:1946-3944
1946-3936
1946-3944