Control device for internal combustion engine
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United States of America Patent
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Feb 11, 2014
Grant Date -
Nov 7, 2013
app pub date -
Jan 24, 2011
filing date -
Jan 24, 2011
priority date (Note) -
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Abstract
A control device is provided that generates a target air-fuel ratio by lessening a change speed of a required air-fuel ratio of an internal combustion engine. However, when a deterioration degree of a catalyst which is disposed in an exhaust passage of the internal combustion engine is a predetermined reference or more, lessening of the change speed of the required air-fuel ratio is stopped, or a lessening degree of the change speed of the required air-fuel ratio is decreased. The control device calculates a target air quantity for realizing the required torque under the target air-fuel ratio. For calculation of the target air quantity, data in which relationship of torque generated by the internal combustion engine and an air quantity taken into a cylinder is fixed by being related to an air-fuel ratio can be used.
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