Experimental Investigation of Light-Medium Load Operating Sensitivity in a Gasoline Compression Ignition (GCI) Light-Duty Diesel Engine Univ. of Wisconsin Madison

Format:

Conference/Event

Author/Creator:

Loeper, Loeper, author.

Contributor:

Adams, Cory

Andrie, Michael

Durrett, Russ

Foster, David E.

Ghandhi, Jaal

Krieger, Roger

Ra, Youngchul

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

The light-medium load operating range (4-7 bar net IMEP)presents many challenges for advanced low temperature combustionstrategies utilizing low cetane fuels (specifically, 87-octanegasoline) in light-duty, high-speed engines. The overly leanoverall air-fuel ratio (Φ0.4) sometimes requires unrealisticallyhigh inlet temperatures and/or high inlet boost conditions toinitiate autoignition at engine speeds in excess of 1500 RPM. Theobjective of this work is to identify and quantify the effects ofvariation in input parameters on overall engine operation. Inputparameters including inlet temperature, inlet pressure, injectiontiming/duration, injection pressure, and engine speed were variedin a ~0.5L single-cylinder engine based on a production GeneralMotors 1.9L 4-cylinder high-speed diesel engine.With constraints of combustion efficiency, noise level (pressurerise rate) and emissions, engine operation sensitivity due tochanges in inlet temperature between 50-90C was first examined forfixed fueling rates. This experiment was then repeated at differentinlet pressures and engine speeds. Finally, constant loadexperiments were performed in which perturbations in injectionstrategies (timing, duration, and pressure) were executed to assessoverall system sensitivity. These experiments revealed primary andsecondary effects with respect to changes in engine operation. Inaddition, an assessment of combustion robustness was made aswell.Based on the results, we conclude that input parameters can beeffectively manipulated to maintain low NOx emissions 0.6g/kg-fuel with good combustion stability (COV of IMEP 3%) over awide inlet temperature range. Further optimization (with respect tocombustion efficiency and CO/UHC emissions) was realized withadditional adjustment of these input parameters. Interestingly,gross ISFC remained relatively unaffected by changes in inputparameters (185-190 g/kWh). This last observation leads to theassessment that GCI combustion can provide robust,high-fuel-efficiency, low-emissions light-medium load operation ina light-duty engine application

Notes:

Vendor supplied data

Publisher Number:

2013-01-0896

Access Restriction:

Restricted for use by site license