Diagnosis system of exhaust aftertreatment apparatus for internal combustion engine
US7162860B2 · kind B2 · utility
14Cited by
10References
14Claims
0Family size
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Key dates
| Filing date | Apr 1, 2004 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Aug 11, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A diagnosis system of an exhaust aftertreatment apparatus for an internal combustion engine is arranged to execute a first deterioration diagnosis of the exhaust aftertreatment apparatus on the basis of a change of a catalyst downstream side air/fuel ratio relative to a change of a catalyst upstream side air/fuel ratio during a rich spike control and to execute a second deterioration diagnosis from an inversion cycle of a feedback quantity during the feedback control of the catalyst downstream side air/fuel ratio during a stoichiometric control when the first deterioration diagnosis made a deterioration determination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.