Control Device For Internal Combustion Engine

Abstract: Provided is a control device for an internal combustion engine, the control device comprising a means for calculating an excess air ratio in which a table or the like can be set easily and that has excellent accuracy. The control device includes an excess ratio calculation unit (25) that calculates an excess air ratio ? on the basis of a voltage value VHG that increases with an increase in the excess air ratio ? obtained on the basis of oxygen concentration in the exhaust of the internal combustion engine. The excess ratio calculation unit (25) calculates a corresponding excess air ratio ? in response to the input of a voltage value VHGMA between a voltage value VHG5 corresponding to a rich-side boundary excess ratio LAMR and a voltage value VHG4 corresponding to a lean-side boundary excess ratio LAML. The excess air ratio ? has a characteristic that changes sensitively with respect to a change in the voltage value VHGMA as the voltage value VHGMA approaches the voltage value VHG5.

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