Failure diagnosis method for reducing agent addition valve
US7849672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2007 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Oct 13, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An object of the invention is to diagnose a failure of an addition valve provided in the exhaust system of an internal combustion engine. To achieve the object, post injection through a fuel injection valve of the internal combustion engine and reducing agent addition through the reducing agent addition valve are performed at different timings, the quantity of fuel injected through the fuel injection valve when the post injection is performed and the quantity of reducing agent added through the reducing agent addition valve when the reducing agent addition is performed are estimated based on a same parameter, and it is diagnosed that the reducing agent addition valve has a failure on condition that the difference between the estimated fuel quantity and the estimated reducing agent quantity exceeds a predetermined quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.