Control apparatus for internal combustion engine

A control apparatus for an internal combustion engine, comprising:

• an exhaust gas concentration parameter sensor provided in an exhaust passage to detect an exhaust gas concentration parameter which represents a concentration of a predetermined component including oxygen in an exhaust gas;
• and
• an electronic control unit configured to:
• acquire a cylinder gas amount parameter which represents an amount of a cylinder gas in a cylinder of the internal combustion engine which includes a turbocharger having a turbine provided in the exhaust passage and which includes a wastegate valve to open or close a bypass passage to bypass the turbine of the turbocharger so as to change kinetic energy transmitted from the exhaust gas to the turbine,
• perform an air-fuel ratio control to control an air-fuel ratio in the internal combustion engine to oscillate in a predetermined state,
• determine an operation status of the internal combustion engine or an auxiliary device of the internal combustion engine based on the exhaust gas concentration parameter detected by the exhaust gas concentration parameter sensor following a determination that the amount of the cylinder gas represented by the cylinder gas amount parameter acquired by the cylinder gas amount parameter acquisition device is equal to or larger than a predetermined determination value while the air-fuel ratio control is being performed, and
• increase the predetermined determination value as an opening of the wastegate valve increases.

A control apparatus for an internal combustion engine, the control apparatus comprising:

• an exhaust gas concentration parameter sensor disposed in an exhaust passage that is configured to detect an exhaust gas concentration parameter which corresponds to a concentration of a predetermined component in the exhaust gas;
• and
• an electronic control unit configured to:
• acquire a cylinder gas amount parameter which corresponds to an amount of a cylinder gas in a cylinder of the internal combustion engine,
• perform an air-fuel ratio control process for controlling an air-fuel ratio of the internal combustion engine to oscillate in a predetermined manner,
• determine an operation status of the internal combustion engine or an auxiliary device of the internal combustion engine by using the detected exhaust gas concentration parameter in response to a determination that the cylinder gas amount indicated by the acquired cylinder gas amount parameter is equal to or larger than a predetermined determination value, while the air-fuel ratio control process is being performed, and
• set the predetermined determination value to a larger value as the opening of the wastegate valve becomes larger.