Testing of a New Gasoline Compression Ignition (GCI) Concept on Market-Relevant Fuels

Autoren

Prof. Roger Cracknell, Shell Global Solutions (UK), London;
Dimitri Bastaert, Sébastien Houillé, PSA, Paris;
Julien Châtelain, Olivier Larguier, Danielson Engineering (Everest Team), Magny-Cours;
Yvon Beaugé, YBT Consulting (Everest Team), Rungis;
Ortwin Costenoble, Timo de Groot, NEN, Delft;
Florence Duffour, IFP Energies Nouvelles, Institut Carnot IFPEN TE, Rueil-Malmaison;
Florian Gente, CIRTEM - Aboard Engineering (Everest Team), Saint Jean;
Dr. Heather Hamje, Dr. John Rogerson, Concawe, Brüssel;
Baptiste Nicolas, Sylvain Prevet, CERTAM (Everest Team), Saint Etienne du Rouvray;
Leonardo Pellegrini, Eni, San Donato Milanese

Zusammenfassung

A practical Gasoline Compression Ignition (GCI) Concept is presented that works on a diverse range of market gasolines (including standard European ULG 95) over the whole speed/load map. At low loads, a spark is employed to assist the autoignition of gasoline.

Employing combustion assistance at low load avoids the requirements of a complex cam profile to control the valve train mechanism in order to ensure that the fuel air mixture reaches a sufficient temperature to auto-ignite. Thanks also to the active control of the swirl level, the combustion system presented here is robust against variability in charge motion, and subtle differences in fuel reactivity. The  approach is shown to be able to achieve exceptionally low fuel consumption over a wide area of the speed/load map, equivalent to diesel-like efficiency, although the efficiency deteriorates at low load where the combustion assistance operates.

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