CONTROLLER FOR INTERNAL COMBUSTION ENGINE
First Claim
1. A controller for an internal combustion engine, wherein the internal combustion engine includes a fuel injection valve, a catalyst provided in an exhaust passage and capable of storing oxygen, and an air-fuel ratio sensor provided downstream of the catalyst in the exhaust passage, the controller comprising processing circuitry, whereinthe processing circuitry is configured to execute an inflow process when an oxygen storage amount of the catalyst is greater than or equal to a predetermined amount,the inflow process includes operating the fuel injection valve to cause a fluid containing oxygen and unburned fuel to flow into the catalyst,an amount of the unburned fuel is greater than or equal to an ideal amount of unburned fuel that reacts with all of the oxygen, andthe processing circuitry is configured to execute, based on a detection value of the air-fuel ratio sensor obtained during an execution of the inflow process, a deviation amount calculation process that calculates a deviation amount indication value that indicates a deviation amount of a detection value of the air-fuel ratio sensor.
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Accused Products
Abstract
A controller for an internal combustion engine includes processing circuitry. The processing circuitry is configured to execute an inflow process when an oxygen storage amount of the catalyst is greater than or equal to a predetermined amount. The inflow process includes operating the fuel injection valve to cause a fluid containing oxygen and unburned fuel to flow into the catalyst. An amount of the unburned fuel is greater than or equal to an ideal amount of unburned fuel that reacts with all of the oxygen. The processing circuitry is configured to execute, based on a detection value of the air-fuel ratio sensor obtained during an execution of the inflow process, a deviation amount calculation process that calculates a deviation amount indication value that indicates a deviation amount of a detection value of the air-fuel ratio sensor.
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Citations
26 Claims
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1. A controller for an internal combustion engine, wherein the internal combustion engine includes a fuel injection valve, a catalyst provided in an exhaust passage and capable of storing oxygen, and an air-fuel ratio sensor provided downstream of the catalyst in the exhaust passage, the controller comprising processing circuitry, wherein
the processing circuitry is configured to execute an inflow process when an oxygen storage amount of the catalyst is greater than or equal to a predetermined amount, the inflow process includes operating the fuel injection valve to cause a fluid containing oxygen and unburned fuel to flow into the catalyst, an amount of the unburned fuel is greater than or equal to an ideal amount of unburned fuel that reacts with all of the oxygen, and the processing circuitry is configured to execute, based on a detection value of the air-fuel ratio sensor obtained during an execution of the inflow process, a deviation amount calculation process that calculates a deviation amount indication value that indicates a deviation amount of a detection value of the air-fuel ratio sensor.
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21. A controller for an internal combustion engine, wherein the internal combustion engine includes a fuel injection valve, a catalyst provided in an exhaust passage and capable of storing oxygen, and an air-fuel ratio sensor provided downstream of the catalyst in the exhaust passage, the controller comprising:
- processing circuitry, wherein
the processing circuitry is configured to execute an air-fuel ratio control process that operates the fuel injection valve to control an air-fuel ratio of a mixture in a combustion chamber of the internal combustion engine to a target value, the processing circuitry is configured to execute a rich control process that is triggered when a detection value of the air-fuel ratio sensor is greater than or equal to a lean determination value, the detection value of the air-fuel ratio sensor being equal to the lean determination value indicates that an air-fuel ratio is leaner than a stoichiometric air-fuel ratio, the rich control process includes setting the target value to be richer than the stoichiometric air-fuel ratio, the processing circuitry is configured to execute a lean control process that is triggered when the detection value of the air-fuel ratio sensor is less than or equal to a rich determination value, the detection value of the air-fuel ratio sensor being equal to the rich determination value indicates that the air-fuel ratio is richer than the stoichiometric air-fuel ratio, the lean control process includes setting the target value to be leaner than the stoichiometric air-fuel ratio, the processing circuitry is configured to execute a deviation amount calculation process when an execution condition of a process that calculates a deviation amount indication value indicating a deviation amount of a detection value of the air-fuel ratio sensor is satisfied, the deviation amount calculation process includes calculating the deviation amount indication value based on a detection value of the air-fuel ratio sensor obtained during an execution of the rich control process, the processing circuitry is configured to execute a variable process that variably sets at least one of the target value set by the rich control process or the target value set by the lean control process, and the target value variably set when the execution condition is satisfied differs from the target value variably set when the execution condition is not satisfied. - View Dependent Claims (22, 23, 24, 25, 26)
- processing circuitry, wherein
Specification