CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Jan 25, 2018
app pub date -
Jul 19, 2017
filing date -
Jul 21, 2016
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Abstract
A control device of an internal combustion engine 100 provided with a compression ratio control part controlling a mechanical compression ratio to a target compression ratio. The compression ratio control part is configured provided with an optimum compression ratio calculating part calculating an optimum compression ratio in an engine operating state based on the engine operating state, a permittable changed compression ratio calculating part calculating a permittable changed compression ratio giving an effect of improvement of the fuel efficiency even considering the amount of fuel consumed by driving a motor when the optimum compression ratio is higher than a target compression ratio, and a target compression ratio changing part changing the target compression ratio to the permittable changed compression ratio if the optimum compression ratio is higher than the target compression ratio and the optimum compression ratio becomes the permittable changed compression ratio or more.
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