Exhaust purification system of internal combustion engine

An exhaust purification system of an internal combustion engine, the exhaust purification system comprising:

• a catalyst arranged in an exhaust passage of the internal combustion engine and able to store oxygen;
• and
• a processor configured to
• calculate an oxygen storage amount of the catalyst,
• calculate a poisoning amount of the catalyst, and
• control an amount of oxygen supplied to the catalyst based on the oxygen storage amount and the poisoning amount, wherein
• the processor is configured to supply oxygen to the catalyst when an air-fuel mixture is not being burned in a combustion chamber of the internal combustion engine,
• the exhaust purification system further comprises a motoring device for driving rotation of a crankshaft of the internal combustion engine, and
• the processor is configured to control the amount of oxygen by changing a time during which the motoring device drives rotation of the crankshaft.

An exhaust purification system of an internal combustion engine, the exhaust purification system comprising:

• a catalyst arranged in an exhaust passage of the internal combustion engine and able to store oxygen;
• and
• a processor configured to
• calculate an oxygen storage amount of the catalyst,
• calculate a poisoning amount of the catalyst, and
• control an amount of oxygen supplied to the catalyst based on the oxygen storage amount and the poisoning amount, wherein
• the processor is configured to supply oxygen to the catalyst when an air-fuel mixture is not being burned in a combustion chamber of the internal combustion engine,
• the exhaust purification system further comprises a motoring device for driving rotation of a crankshaft of the internal combustion engine, and
• the processor is configured to control the amount of oxygen by changing an opening degree of a throttle valve arranged in an intake passage of the internal combustion engine when the motoring device drives rotation of the crankshaft.

An exhaust purification system of an internal combustion engine, the exhaust purification system comprising:

• a catalyst arranged in an exhaust passage of the internal combustion engine and able to store oxygen;
• and
• an electronic control unit, wherein
• the electronic control unit is configured to
• calculate an oxygen storage amount of the catalyst,
• calculate a poisoning amount of the catalyst, and
• control an amount of oxygen supplied to the catalyst based on the oxygen storage amount and the poisoning amount,
• the electronic control unit is configured to supply oxygen to the catalyst when startup of the internal combustion engine is requested,
• a vehicle mounting the internal combustion engine comprises the internal combustion engine and a motor as sources of power for driving, and
• the electronic control unit is configured to
• control startup and stopping of the internal combustion engine,
• calculate a rich poisoning amount of the catalyst by exhaust gas of an air-fuel ratio richer than the stoichiometric air-fuel ratio, and
• lengthen a stopped time of the internal combustion engine more when a temperature of the catalyst is equal to or more than a predetermined temperature and the rich poisoning amount is equal to or more than a predetermined value, compared to when the temperature of the catalyst is less than the predetermined temperature or the rich poisoning amount is less than the predetermined value.