| CPC F02D 41/1454 (2013.01) [F02D 41/1495 (2013.01)] | 5 Claims |
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1. A control device for an internal combustion engine, the control device comprising:
a processor, and
a memory storing programs that cause the processor to execute following processes (i) to (iii):
(i) acquiring a sensor output value of an air-fuel ratio sensor installed in an exhaust passage of the internal combustion engine, the air-fuel ratio sensor including an element,
(ii) detecting an air-fuel ratio by calculating an air-fuel ratio detection value based on the sensor output value and a gain, and
(iii) executing a Proportional-Integral-Differential control as an air-fuel ratio feedback control based on the detected air-fuel ratio, wherein
the program further causes the processor to
start the processes (ii) and (iii) in a case where an element temperature of the air-fuel ratio sensor becomes equal to or higher than a predetermined activation temperature, and
calculate the air-fuel ratio detection value during a period from when the processes (ii) and (iii) are started until a predetermined condition is satisfied, by setting the gain to a smaller value than a value of the gain after an elapse of the period, in a case where the sensor output value indicates that an air fuel ratio in the exhaust passage is richer than stoichiometric.
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