Exhaust Gas Control Apparatus for Internal Combustion Engine

An exhaust gas control apparatus for an internal combustion engine, comprising:

• an exhaust gas control device which is provided in an exhaust passage of an internal combustion engine, and which has oxidation function;
• fuel supply device for supplying fuel to the exhaust gas control device from a position upstream of the exhaust gas control device;
• and
• intake air amount control device for controlling an amount of air taken in the internal combustion engine, wherein,
• when a temperature increasing condition for increasing a temperature of the exhaust gas control device to a target temperature in order to recover an exhaust gas control ability of the exhaust gas control device has been satisfied, if an engine load of the internal combustion engine is lower than a predetermined engine load, the temperature of the exhaust gas control device is increased to or maintained at the target temperature by controlling an amount of fuel supplied from the fuel supply device to the exhaust gas control device, and the intake air amount control device controls the amount of air taken in the internal combustion engine to an intake air amount that is set based on an engine rotational speed of the internal combustion engine and the engine load of the internal combustion engine;
• and
• when the temperature increasing condition has been satisfied, if the engine load of the internal combustion engine is equal to or higher than the predetermined engine load, fuel supply from the fuel supply device is prohibited, and the intake air amount control device controls the amount of air taken in the internal combustion engine, whereby the temperature of the exhaust gas control device is increased to or maintained at the target temperature.