The Effects of Combined Internal and External Exhaust Gas Recirculation on Gasoline Controlled Auto-Ignition Cosworth Technology Limited

Format:

Conference/Event

Author/Creator:

Cairns, Alasdair, author.

Conference Name:

SAE 2005 World Congress & Exhibition (2005-04-11 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2005

Summary:

A combination of internal and external exhaust gas recirculation has been used to increase the attainable load in a multi-cylinder engine operated in gasoline controlled auto-ignition. The amount of residual gas trapped in the cylinder was adjusted via the negative valve overlap method. The flow of externally re-circulated exhaust gas was varied using a typical production level valve. Under stoichiometric fuelling conditions, the highest output achieved using internal exhaust gas was limited by excessive pressure rise and unacceptable levels of knock. Introducing additional external exhaust gas was found to retard ignition, reduce the rate of heat release and limit the peak knocking pressure. In turn, an increase in engine load of 20-65% was achieved, with greatest benefit governed by combustion stability limits and realised at lower engine speeds. Combined with lean burn controlled auto-ignition at lower loads, the technique has enabled reduced fuel consumption without the requirement of a NOx trap

Notes:

Vendor supplied data

Publisher Number:

2005-01-0133

Access Restriction:

Restricted for use by site license