Malfunction diagnosis device for exhaust gas purification system and malfunction diagnosis method therefor
US8132450B2 · kind B2 · utility
14Cited by
9References
25Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 14, 2009 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Apr 14, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a malfunction diagnosis device for an exhaust gas purification system including an exhaust gas purification catalyst disposed in the exhaust passage of an internal combustion engine, and a reductant supply device that supplies reductant to exhaust gas that flows in an upstream side of the exhaust gas purification catalyst, the degree of degradation of the exhaust gas purification catalyst is diagnosed by comparing the timing at which the bed temperature of the exhaust gas purification catalyst starts to rise due to the heat of moisture adsorption reaction, against a normal value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.