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 a cylinder-specific air-fuel ratio processing is being executed, the cylinder-specific air-fuel ratio processing controlling (i) an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine to be a rich air-fuel ratio, which is lower than a stoichiometric air-fuel ratio, and (ii) an air-fuel ratio of at least one of the other cylinders of the plurality of cylinders to be a lean air-fuel ratio, which is higher than the stoichiometric air-fuel ratio;
in response to determining that the cylinder-specific air-fuel ratio processing is not being executed, calculate and update a first learning value, which is a difference between a knock strength of the internal combustion engine and a first determination value;
in response to determining that the cylinder-specific air-fuel ratio processing is being executed, prohibit updating of the first learning value;
calculate a target ignition timing of the internal combustion engine based on the first learning value; and
control ignition timing of the internal combustion engine based on the calculated target ignition timing.
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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 a cylinder-specific air-fuel ratio processing is being executed, the cylinder-specific air-fuel ratio processing controlling (i) an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine to be a rich air-fuel ratio, which is lower than a stoichiometric air-fuel ratio, and (ii) an air-fuel ratio of at least one of the other cylinders of the plurality of cylinders to be a lean air-fuel ratio, which is higher than the stoichiometric air-fuel ratio; in response to determining that the cylinder-specific air-fuel ratio processing is not being executed, calculate and update a first learning value, which is a difference between a knock strength of the internal combustion engine and a first determination value; in response to determining that the cylinder-specific air-fuel ratio processing is being executed, prohibit updating of the first learning value; calculate a target ignition timing of the internal combustion engine based on the first learning value; and control ignition timing of the internal combustion engine based on the calculated target ignition timing. - 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 a cylinder-specific air-fuel ratio processing is being executed, the cylinder-specific air-fuel ratio processing controlling (i) an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine to be a rich air-fuel ratio, which is lower than a stoichiometric air-fuel ratio, and (ii) an air-fuel ratio of at least one of the other cylinders of the plurality of cylinders to be a lean air-fuel ratio, which is higher than the stoichiometric air-fuel ratio; in response to determining that the cylinder-specific air-fuel ratio processing is not being executed, calculate and update a first learning value, which is a difference between a knock strength of the internal combustion engine and a first determination value; in response to determining that the cylinder-specific air-fuel ratio processing is being executed, calculate and update a second learning value, which is a difference between the knock strength of the internal combustion engine and a second determination value; in response to determining that the cylinder-specific air-fuel ratio processing is being executed, calculate a target ignition timing of the internal combustion engine based on the second learning value; and control ignition timing of the internal combustion engine based on the calculated target ignition timing.
Specification