Adaptive engine injection for emissions reduction

a technology of engine injection and emission reduction, which is applied in the direction of fuel injection apparatus, electric control, charge feed system, etc., can solve the problems of reducing the oxygen in the combustion regime, non-optimal combustion, and reducing the maximum combustion temperature, so as to improve the power output and reduce the injected fuel volume. , the effect of increasing the injection pressur
US20080295798A1Active Publication Date: 2008-12-04WISCONSIN ALUMNI RES FOUND
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
WISCONSIN ALUMNI RES FOUND
Publication Date
2008-12-04

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Abstract

NOx and soot emissions from internal combustion engines, and in particular compression ignition (diesel) engines, are reduced by varying fuel injection timing, fuel injection pressure, and injected fuel volume between low and greater engine loads. At low loads, fuel is injected during one or more low-pressure injections occurring at low injection pressures between the start of the intake stroke and approximately 40 degrees before top dead center during the compression stroke. At higher loads, similar injections are used early in each combustion cycle, in addition to later injections which preferably occur between about 90 degrees before top dead center during the compression stroke, and about 90 degrees after top dead center during the expansion stroke (and which most preferably begin at or closely adjacent the end of the compression stroke). These later injections have higher injection pressure, and also lower injected fuel volume, than the earlier injections.
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Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

[0001] This invention was made with United States government support awarded by the following agencies:

[0002] U.S. Department of Energy (DOE) Grant No.: DE-FC26-06NT42628 The United States has certain rights in this invention.FIELD OF THE INVENTION

[0003] This document concerns an invention relating generally to methods and devices for reducing emissions from internal combustion engines, and more specifically to methods and apparata for reducing soot and NOx emissions from internal combustion engines (and in particular diesel engines).BACKGROUND OF THE INVENTION

[0004] Common pollutants arising from the use of internal combustion engines are nitrogen oxides (commonly denoted NOx) and particulate matter (also known simply as “soot”). NOx is generally associated with high-temperature engine conditions, and may be reduced by use of measures such as exhaust gas recirculation (EGR), wherein the engine intake air is diluted with relatively inert e...

Claims

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