Trouble diagnosis device and trouble diagnosis method for NOx sensor
US8359826B2 · kind B2 · utility
17Cited by
4References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 25, 2008 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Jul 25, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A trouble diagnosis device and method for an NOx sensor for determining abnormality of an NOx sensor used in an exhaust gas purification system. The device can perform a trouble diagnosis without forcedly creating a diagnosis mode during operation of an internal combustion engine and without deterioration of drivability or fuel consumption. The device detects the time-lapse variation of the exhaust NOx flow rate suitable for diagnosis in a normal operation mode and determines whether the NOx sensor responds with following this variation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.