Method for diagnosing degradation in catalyst
US-10428717-B2 · Oct 1, 2019 · US
Catalyst deterioration diagnosis device and catalyst deterioration diagnosis method
US11274592B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11274592-B2 |
| Application number | US-201916594240-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 7, 2019 |
| Priority date | Oct 9, 2018 |
| Publication date | Mar 15, 2022 |
| Grant date | Mar 15, 2022 |
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- Title
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. 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. 2. The catalyst deterioration diagnosis device according to claim 1 , wherein the evaluative catalyst temperature is set according to an amount of air fed to the catalyst. 3. The catalyst deterioration diagnosis device according to claim 1 , wherein the gas sensor is a NOx sensor or a HC sensor. 4. 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. 5. The catalyst deterioration diagnosis device according to claim 4 , wherein the evaluative output is set according to an amount of air fed to the catalyst. 6. The catalyst deterioration diagnosis device according to claim 4 , wherein the gas sensor is a NOx sensor or a HC sensor. 7. 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. 8. The catalyst deterioration diagnosis device according to claim 7 , wherein the evaluative catalyst temperature is set according to an amount of air fed to the catalyst. 9. The catalyst deterioration diagnosis device according to claim 7 , wherein the first gas sensor and the second gas sensor are each a NOx sensor or a HC sensor. 10. 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. 11. The catalyst deterioration diagnosis device according to claim 10 , wherein the evaluative conversion efficiency is set according to an amount of air fed to the catalyst. 12. The catalyst deterioration diagnosis device according to claim 10 , wherein the first gas sensor and the second gas sensor are each a NOx sensor or a HC sensor.
Assignees
Inventors
Classifications
Catalyst oxygen storage capacity · CPC title
Temperature of the exhaust gas treatment apparatus · CPC title
- F01N11/002Primary
the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus · CPC title
Catalytic activity of catalytic converters · CPC title
for measuring or detecting HC · CPC title
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Frequently asked questions
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- What does patent US11274592B2 cover?
- 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 t…
- Who is the assignee on this patent?
- Ngk Insulators Ltd
- What technology area does this patent fall under?
- Primary CPC classification F01N11/002. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Mar 15 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).