Control Device for Internal Combustion Engine
First Claim
1. A control device for an internal combustion engine, the control device comprising an electronic control unit configured to determine whether or not cylinder-specific air-fuel ratio processing is being executed in which an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine is controlled to be a rich air-fuel ratio lower than a stoichiometric air-fuel ratio and an air-fuel ratio of at least one of the other cylinders is controlled to be a lean air-fuel ratio higher than the stoichiometric air-fuel ratio, wherein:
- the electronic control unit is configured, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is not being executed, to update a first learning value in which a result of comparison between a knock strength of the internal combustion engine and a first determination value is reflected; and
the electronic control unit is configured, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is being executed, to prohibit updating of the first learning value and to calculate a target ignition timing of the internal combustion engine based on the first learning value.
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Accused Products
Abstract
A control device for an internal combustion engine includes an electronic control unit configured to determine whether or not cylinder-specific air-fuel ratio processing is being executed in which an air-fuel ratio of at least one of a plurality of cylinders is controlled to be a rich air-fuel ratio and an air-fuel ratio of at least one of the other cylinders is controlled to be a lean air-fuel ratio. The electronic control unit updates a first learning value in which a result of comparison between a knock strength of the internal combustion engine and a first determination value is reflected when the cylinder-specific air-fuel ratio processing is not being executed. The electronic control unit prohibits updating of the first learning value and calculates a target ignition timing of the internal combustion engine based on the first learning value when the cylinder-specific air-fuel ratio processing is being executed.
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Citations
5 Claims
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1. A control device for an internal combustion engine, the control device comprising an electronic control unit configured to determine whether or not cylinder-specific air-fuel ratio processing is being executed in which an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine is controlled to be a rich air-fuel ratio lower than a stoichiometric air-fuel ratio and an air-fuel ratio of at least one of the other cylinders is controlled to be a lean air-fuel ratio higher than the stoichiometric air-fuel ratio, wherein:
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the electronic control unit is configured, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is not being executed, to update a first learning value in which a result of comparison between a knock strength of the internal combustion engine and a first determination value is reflected; and the electronic control unit is configured, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is being executed, to prohibit updating of the first learning value and to calculate a target ignition timing of the internal combustion engine based on the first learning value. - View Dependent Claims (2, 3, 4)
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5. A control device for an internal combustion engine, the control device comprising an electronic control unit configured to determine whether or not cylinder-specific air-fuel ratio processing is being executed in which an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine is controlled to be a rich air-fuel ratio lower than a stoichiometric air-fuel ratio and an air-fuel ratio of at least one of the other cylinders is controlled to be a lean air-fuel ratio higher than the stoichiometric air-fuel ratio, wherein:
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the electronic control unit is configured, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is not being executed, to update a first learning value in which a result of comparison between a knock strength of the internal combustion engine and a first determination value is reflected; the electronic control unit is configured to, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is being executed, to update a second learning value in which a result of comparison between the knock strength of the internal combustion engine and a second determination value is reflected; and the electronic control unit is configured, when the electronic control unit determines that the cylinder-specific air-fuel ratio processing is being executed, to calculate a target ignition timing of the internal combustion engine based on the second learning value.
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Specification