SELF IGNITION OPERATION OF ALTERNATIVE FUEL INTERNAL COMBUSTION ENGINES
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United States of America Patent
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Issued Date -
Jan 29, 2015
app pub date -
Feb 27, 2013
filing date -
Feb 28, 2012
priority date (Note) -
Abandoned
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Abstract
A method for operating a self ignition internal combustion engine (ICE) with a low cetane fuel such as alternative fuels, for example pyrolysis oil, as well as an ICE are disclosed. To reach self ignition conditions one may provide the internal combustion engine to have a compression ratio of at least 17:1, for example, 18:1 (step 100). Moreover, one may load a combustion chamber of the internal combustion engine with charge air having a minimal temperature in the range of 340 degrees K to 360 degrees K (step 200) and inject the low cetane fuel at an injection angle of a piston of the internal combustion engine within the range of 20° to 10°, for example between 17.5° to 11° before top dead center into the charge air (step 300), thereby forming a low cetane fuel-charge air mixture. Compressing the low cetane fuel-charge air mixture further during the combustion cycle may result in a compression end temperature of at least 1000 K, allowing self ignition of the low cetane fuel.
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