Emission control apparatus of internal combustion engine and control method for the emission control apparatus
First Claim
1. An emission control apparatus of an internal combustion engine that has an engine stop mode of stopping the internal combustion engine during a run of a vehicle, comprising:
- an emission control catalyst disposed in an exhaust passage of the internal combustion engine;
a storage computing device that computes a storage of oxygen in the emission control catalyst; and
an air-fuel ratio controller that performs an air-fuel ratio control of the internal combustion engine based on the storage of oxygen computed by the storage computing device, wherein the storage computing device computes the storage of oxygen during the engine stop mode of the internal combustion engine at which time no exhaust gas is emitted, and wherein the air-fuel ratio controller performs the air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed by the storage computing device during the engine stop mode.
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Abstract
A catalytic emission control apparatus of an internal combustion engine that has an engine stop mode of stopping the internal combustion engine during a run of a vehicle utilizes an oxygen absorption-storage action of an emission control catalyst disposed in an exhaust passage of the internal combustion engine. The emission control apparatus has a storage computing device that computes a storage of oxygen in the emission control catalyst, and air-fuel ratio controller performs an air-fuel ratio control of the internal combustion engine based on the storage of oxygen computed by the storage computing device. The storage computing device computes the storage of oxygen during the engine stop mode of the internal combustion engine. The air-fuel ratio controller performs the air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed by the storage computing device during the engine stop mode.
37 Citations
16 Claims
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1. An emission control apparatus of an internal combustion engine that has an engine stop mode of stopping the internal combustion engine during a run of a vehicle, comprising:
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an emission control catalyst disposed in an exhaust passage of the internal combustion engine;
a storage computing device that computes a storage of oxygen in the emission control catalyst; and
an air-fuel ratio controller that performs an air-fuel ratio control of the internal combustion engine based on the storage of oxygen computed by the storage computing device, wherein the storage computing device computes the storage of oxygen during the engine stop mode of the internal combustion engine at which time no exhaust gas is emitted, and wherein the air-fuel ratio controller performs the air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed by the storage computing device during the engine stop mode. - View Dependent Claims (2)
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3. A control method for an emission control apparatus of an internal combustion engine that has an engine stop mode of stopping the internal combustion engine during a run of a vehicle, the emission control apparatus utilizing an oxygen absorption-storage action of an emission control catalyst disposed in an exhaust passage of the internal combustion engine, the control method comprising the steps of:
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computing a storage of oxygen during the engine stop mode of the internal combustion engine at which time no exhaust gas is emitted; and
performing an air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed during the engine stop mode.
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4. An emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, comprising:
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an emission control catalyst disposed in an exhaust passage of the internal combustion engine;
an output distribution controller that controls a distribution between an output of the internal combustion engine and an output of the electric motor;
a storage computing device that computes a storage of oxygen in the emission control catalyst; and
an air-fuel ratio controller that performs an air-fuel ratio control of the internal combustion engine based on the storage of oxygen computed by the storage computing device, wherein the output distribution control device controls the distribution of output between the internal combustion engine and the electric motor based on a condition parameter of an exhaust system of the internal combustion engine, wherein the storage computing device computes the storage of oxygen during the engine stop mode of the internal combustion engine, and wherein the air-fuel ratio controller performs the air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed by the storage computing device during the engine stop mode. - View Dependent Claims (5)
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6. An emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, comprising:
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an emission control catalyst disposed in an exhaust passage of the internal combustion engine; and
an output distribution controller that controls a distribution between an output of the internal combustion engine and an output of the electric motor, wherein the output distribution controller controls the distribution of output between the internal combustion engine and the electric motor so that an amount of a specific component in an exhaust gas that flows out of the emission control catalyst is within a predetermined range. - View Dependent Claims (7)
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8. A control method for an emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, the emission control apparatus utilizing an emission control catalyst disposed in an exhaust passage of the internal combustion engine, the control method comprising the steps of:
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computing an amount of a specific component in an exhaust gas the flows out of the emission control catalyst; and
controlling a distribution of output between the internal combustion engine and the electric motor so that the amount of the specific component is within a predetermined range.
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9. An emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, comprising:
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an emission control catalyst disposed in an exhaust passage of the internal combustion engine;
an absorption-storage capability computing device that computes an oxygen absorption-storage capability of the emission control catalyst; and
an output distribution controller that controls a distribution between an output of the internal combustion engine and an output of the electric motor, wherein the absorption-storage capability computing device computes the oxygen absorption-storage capability by serially performing a fuel stop and a rich operation, and wherein at a time of computation of an oxygen absorption-storage capability by the absorption-storage capability computing device, the output distribution controller controls the distribution of output between the internal combustion engine and the electric motor so as to provide an output required of the vehicle. - View Dependent Claims (10, 11)
a storage computing device that computes a storage of oxygen in the emission control catalyst; and
an air-fuel ratio controller that performs an air-fuel ratio control of the internal combustion engine based on the storage of oxygen computed by the storage computing device, wherein the storage computing device computes the storage of oxygen during the engine stop mode of the internal combustion engine, and wherein the air-fuel ratio controller performs the air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed by the storage computing device during the engine stop mode.
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11. The emission control apparatus according to claim 10, wherein when the air-fuel ratio control is performed at a time of a restart of the internal combustion engine, the air-fuel ratio controller determines a change in the air-fuel ratio within a predetermined time following a restart of the internal combustion engine, based on the storage of oxygen computed by the storage computing device during the engine stop mode.
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12. A control method for an emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, the emission control apparatus utilizing an oxygen absorption-storage action of an emission control catalyst disposed in an exhaust passage of the internal combustion engine, the control method comprising the steps of:
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computing an oxygen absorption-storage capability by serially performing a fuel stop and a rich operation, and at a time of computation of an oxygen absorption-storage capability, controlling a distribution of output between the internal combustion engine and the electric motor so as to provide an output required of the vehicle.
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13. An emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, comprising:
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an emission control catalyst disposed in an exhaust passage of the internal combustion engine;
an absorption-storage capability computing device that computes an oxygen absorption-storage capability of the emission control catalyst; and
an output distribution controller controls a distribution between an output of the internal combustion engine and an output of the electric motor, wherein the absorption-storage capability computing device computes the oxygen absorption-storage capability by serially performing a lean operation and a rich operation near a limit within a maximum range of combustible air-fuel ratios, and wherein at a time of computation of an oxygen absorption-storage capability by the absorption-storage capability computing device, the output distribution controller controls the distribution of output between the internal combustion engine and the electric motor so as to provide an output required of the vehicle. - View Dependent Claims (14, 15)
a storage computing device that computes a storage of oxygen in the emission control catalyst; and
an air-fuel ratio controller that performs an air-fuel ratio control of the internal combustion engine based on the storage of oxygen computed by the storage computing device, wherein the storage computing device computes the storage of oxygen during the engine stop mode of the internal combustion engine, and wherein the air-fuel ratio controller performs the air-fuel ratio control when the internal combustion engine is restarted after the engine stop mode is discontinued, based on the storage of oxygen computed by the storage computing device during the engine stop mode.
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15. The emission control apparatus according to claim 14, wherein when the air-fuel ratio control is performed at a time of a restart of the internal combustion engine, the air-fuel ratio controller determines a change in the air-fuel ratio within a predetermined time following a restart of the internal combustion engine, based on the storage of oxygen computed by the storage computing device during the engine stop mode.
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16. A control method for an emission control apparatus of an internal combustion engine of a hybrid vehicle that is run via the internal combustion engine and an electric motor, the emission control apparatus utilizing an oxygen absorption-storage action of an emission control catalyst disposed in an exhaust passage of the internal combustion engine, the control method comprising the steps of:
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computing an oxygen absorption-storage capability by serially performing a lean operation and a rich operation near a limit within a maximum range of combustible air-fuel ratios, and at a time of computation of an oxygen absorption-storage capability, controlling a distribution of output between the internal combustion engine and the electric motor so as to provide an output required of the vehicle.
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Specification