Air-fuel ratio control apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKoji Honda, Seiji Hirowatari, Masanao Idogawa
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Abstract
An air-fuel ration control apparatus for an internal combustion engine according to the invention includes a control unit that makes a correction to the fuel injection amount using the air-fuel ration learned value when calculating the fuel injection amount, and that changes the guard value that places a limitation on the degree of correction to the fuel injection amount made by using the air-fuel ration learned value, based on the degree to which lubricating oil has been diluted with fuel.
Claims24
An air-fuel ratio control apparatus for an internal combustion engine, comprising:
- a control unit that makes a correction to a fuel injection amount using an air-fuel ratio learned value when calculating the fuel injection amount, and that changes a guard value that places a limitation on a degree of correction to the fuel injection amount made by using the air-fuel ratio learned value, based on a degree to which lubricating oil has been diluted with fuel.
An air-fuel ratio control apparatus for an internal combustion engine, comprising:
- a control unit that makes a correction to a fuel injection amount using an air-fuel ratio learned value when calculating the fuel injection amount, and that changes a guard value that places a limitation on a degree of correction to the fuel injection amount made by using the air-fuel ratio learned value, based on a degree to which fuel has been vaporized from lubricating oil.
An air-fuel ratio control apparatus for an internal combustion engine, comprising:
- a control unit that makes a correction to a fuel injection amount using an air-fuel ratio feedback correction value and an air-fuel ratio learned value when calculating the fuel injection amount, and that performs air-fuel ratio feedback control for calculating the air-fuel ratio feedback correction value and air-fuel ratio learning control for calculating the air-fuel ratio learned value, wherein,
- when the air-fuel ratio learning control is not performed, a guard value that places a limitation on a degree of correction to the fuel injection amount made by using the air-fuel ratio learned value is set, and a degree of limitation placed on the air-fuel ratio learned value by the guard value when the air-fuel ratio feedback control is not performed is set to a value higher than a degree of limitation placed on the air-fuel ratio learned value by the guard value when the air-fuel ratio feedback control is performed.
An air-fuel ratio control apparatus for an internal combustion engine, comprising:
- a control unit that makes a correction to a fuel injection amount using an air-fuel ratio learned value when calculating the fuel injection amount, and that sets a guard value that places a limitation on a degree of correction to the fuel injection amount made by using the air-fuel ratio learned value, when detecting that fuel is not vaporized from lubricating oil, under a condition that a present air-fuel ratio learned value is a value obtained by updating the air-fuel ratio leaned value while the fuel is vaporized from the lubricating oil.
Dependencies are inferred from the claim text.