Internal combustion engine control for improved fuel efficiency
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United States of America Patent
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May 29, 2018
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app pub date -
Jan 9, 2017
filing date -
Jul 11, 2008
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Abstract
A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines based on skip fire operation of the engine are described. In one aspect the skip fire decisions are made on a working cycle by working cycle basis. During selected skipped working cycles, the corresponding cylinders are deactivated such that air is not pumped through the cylinder during the selected skipped working cycles. In some implementations, the cylinders are deactivated by holding associated intake and exhaust valves closed such that an air charge is not present in the working chamber during the selected skipped working cycles.
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