Catalyst deterioration diagnosis device and catalyst deterioration diagnosis method
AssigneeNGK Insulators, Ltd.
InventorsOsamu Nakasone, Kosuke Monna
Life of this patent
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Abstract
A catalyst deterioration diagnosis device includes: a unit configured to obtain a temperature of a catalyst; a unit configured to obtain a sensor output from a gas sensor disposed between the catalyst and an exhaust port; and a unit configured to determine the catalyst to be faulty when the temperature of the catalyst obtained when the sensor output becomes a preset evaluative output is equal to or higher than an evaluative catalyst temperature.
Claims12
A catalyst deterioration diagnosis device that diagnoses deterioration of a catalyst disposed on an exhaust side of a combustion device, the catalyst deterioration diagnosis device comprising:
- a unit configured to obtain a temperature of the catalyst;
- a unit configured to obtain a sensor output from a gas sensor disposed between the catalyst and an exhaust port;
- and
- a unit configured to determine the catalyst to be faulty when the temperature of the catalyst is obtained at an occurrence of the sensor output being substantially equal to a preset evaluative output and when the obtained temperature of the catalyst is equal to or higher than a preset evaluative catalyst temperature.
A catalyst deterioration diagnosis device that diagnoses deterioration of a catalyst disposed on an exhaust side of a combustion device, the catalyst deterioration diagnosis device comprising:
- a unit configured to obtain a temperature of the catalyst;
- a unit configured to obtain a sensor output from a gas sensor disposed between the catalyst and an exhaust port;
- and
- a unit configured to determine the catalyst to be faulty when the sensor output is obtained at an occurrence of the temperature of the catalyst being substantially equal to a preset evaluative catalyst temperature and when the obtained sensor output is equal to or greater than a preset evaluative output.
A catalyst deterioration diagnosis device that diagnoses deterioration of a catalyst disposed on an exhaust side of a combustion device, the catalyst deterioration diagnosis device comprising:
- a unit configured to obtain a temperature of the catalyst;
- a unit configured to obtain a first sensor output from a first gas sensor disposed between the combustion device and the catalyst;
- a unit configured to obtain a second sensor output from a second gas sensor disposed between the catalyst and an exhaust port;
- and
- a unit configured to determine the catalyst to be faulty when the temperature of the catalyst is obtained at an occurrence of a conversion efficiency obtained with the first sensor output and the second sensor output being substantially equal to a preset evaluative conversion efficiency and when the obtained temperature of the catalyst is equal to or higher than a preset evaluative catalyst temperature.
A catalyst deterioration diagnosis device that diagnoses deterioration of a catalyst disposed on an exhaust side of a combustion device, the catalyst deterioration diagnosis device comprising:
- a unit configured to obtain a temperature of the catalyst;
- a unit configured to obtain a first sensor output from a first gas sensor disposed between the combustion device and the catalyst;
- a unit configured to obtain a second sensor output from a second gas sensor disposed between the catalyst and an exhaust port;
- and
- a unit configured to determine the catalyst to be faulty when a conversion efficiency is obtained with the first sensor output and the second sensor output at an occurrence of the temperature of the catalyst being substantially equal to a preset evaluative catalyst temperature and when the obtained conversion efficiency is equal to or less than a preset evaluative conversion efficiency.
Dependencies are inferred from the claim text.