Disclosed is a control device for an internal combustion engine, which determines a fuel injection quantity deviation state and/or an intake oxygen concentration-related parameter deviation state on the basis of the relationship between the target value (Q...

[Objective] An object is to provide a sensor control apparatus and a sensor-control-apparatus control method which can reduce variation in startup time among a plurality of times of execution of detection processing, in consideration of variation in output...

An exhaust passage (15) of an internal-combustion engine (10) includes a selective reduction NOx catalyst (34) and an after-catalyst NOx sensor (50) for detecting a NOx concentration Cr at the downstream thereof. Reducing agent is selectively added from an...

For a predetermined interval following start-up, a correction is applied to the oscillating output signal for the oxygen concentration as measured by a ceramic cell or electrode. For a predetermined interval following start-up, a correction is applied to t...

In engines of a product line, a large amount of variance occurs between individual machines with respect to emissions output. This variance is the result of manufacturing deviations that occur in engine components and in sensors of an engine control system...