Air-Fuel Mixing in a Homogeneous Charge DI Gasoline Engine

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Air-Fuel Mixing in a Homogeneous Charge DI Gasoline Engine

de Sercey, Guillaume / Stokes, John / Gold, Martin / Heikal, Morgan / Morgan, Robert / Begg, Steve

For optimum efficiency, the direct injection (DI) gasoline engine requires two operating modes to cover the full load/speed map. For lower loads and speeds, stratified charge operation can be used, while homogeneous charge is required for high loads and speeds. This paper has focused its attention on the latter of these modes, where the performance is highly dependent on the quality of the fuel spray, evaporation and the air-fuel mixture preparation.Results of quantitative and qualitative Laser Induced Fluorescence (LIF) measurements are presented, together with shadow-graph spray imaging, made within an optically accessed DI gasoline engine. These are compared with previously acquired air flow measurements, at various injection timings, and with engine performance and emissions data obtained in a fired single cylinder non-optical engine, having an identical cylinder head and piston crown geometry.

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Document information

Title :

Air-Fuel Mixing in a Homogeneous Charge DI Gasoline Engine

Additional title:

Sae Technical Papers

Contributors:

de Sercey, Guillaume (author) / Stokes, John (author) / Gold, Martin (author) / Heikal, Morgan (author) / Morgan, Robert (author) / Begg, Steve (author)

Conference:

SAE 2001 World Congress ; 2001

Published in:

Sae Technical Paper Series

Publication date :

2001-03-05

ISSN :

2688-3627 , 0148-7191

DOI :

https://doi.org/10.4271/2001-01-0968

Type of media :

Conference paper