Control device of internal combustion engine

A control device of an internal combustion engine, comprising:

• an operation state detection portion that detects an operation state of an internal combustion engine;
• a target intake air flow rate calculation portion that calculates a target intake air flow rate based on the operation state of the internal combustion engine;
• a throttle that is provided to an intake channel of the internal combustion engine;
• a throttle opening control portion that variably controls an intake amount into the internal combustion engine by varying an effective opening area of the intake channel by controlling a throttle opening of the throttle;
• a throttle opening detection portion that detects the throttle opening;
• a pressure detection portion that detects a pressure of air adjacent to the throttle on a side of the internal combustion engine as an intake manifold pressure;
• an intake air temperature detection portion that detects an intake air temperature of air adjacent to the throttle;
• an intake air flow rate detection portion that detects an intake air flow rate into the internal combustion engine;
• and
• an atmospheric pressure estimation portion that estimates an atmospheric pressure used in a calculation which calculates a target throttle opening of the internal combustion engine,
• wherein:
• the atmospheric pressure estimation portion includes:
• an effective opening area calculation portion that calculates an effective opening area corresponding to the throttle opening from an estimated atmospheric pressure, the intake air flow rate, the intake manifold pressure, and the intake air temperature,
• a throttle opening learning value calculation portion that calculates a learning value based on a set relation map which maps a stored effective opening area to a stored throttle opening and further based on a relation of the effective opening area and the throttle opening,
• a learning value range determination portion that determines whether the relation of the effective opening area and the throttle opening is within a predetermined learning value range,
• an error variation calculation portion that calculates an error variation from an error between the relation map which maps the stored effective opening area and the stored throttle opening and a relation map which maps an effective opening area and a throttle opening and is corrected according to the learning value,
• a variation range determination portion that determines whether the error variation is within a predetermined range,
• an atmospheric pressure estimated value update portion that updates a value of the estimated atmospheric pressure in a case where the relation of the effective opening area and the throttle opening is out of the predetermined learning value range and the error variation is out of the predetermined range, and
• a target throttle opening calculation portion that calculates the target throttle opening using the value of the estimated atmospheric pressure that is updated by the atmospheric pressure estimated value update portion;
• and
• the throttle opening is controlled to be the target throttle opening.