METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Oct 9, 2014
app pub date -
Apr 4, 2014
filing date -
Apr 4, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An internal combustion engine includes a cylinder and a piston journalled to reciprocate therein. The cylinder and piston conjointly delimit a combustion chamber into which a spark plug projects. Ignition of the spark plug occurs at an ignition time point controlled by a control unit. The ignition time point is controlled in an idle speed range according to an idle control having a most advanced ignition time point. The engine has a decompression valve which, when open, connects the combustion chamber to a pressure relief space. The valve is open during engine start and closes when pressure in the combustion chamber exceeds a closing pressure. To close the valve, the ignition occurs in the idle speed range for an engine cycle departing from the idle control at a closing ignition time point lying approximately 5° crankshaft angle ahead of the most advanced ignition time point.
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