NOx sensor diagnostic system and method
US9927413B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2015 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Mar 27, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Diagnostic processes for determining whether a NOx sensor is in a stuck-in-range failure mode may be performed when the NOx sensor reaches an operational temperature and before the oxygen pumps of the NOx sensor are activated and/or during operation. The processes may include interpreting values of a parameter indicative an amount of O2 and/or NOx measured by the NOx sensor. The processes include determining if the values of the parameter exceed a threshold value and indicating a failure of the NOx sensor responsive to the values not exceeding the threshold value. In some implementations, the processes may include increasing an amount of O2 in a chamber of the NOx sensor. Increasing the amount of O2 in the chamber of the NOx sensor may include deactivating an oxygen pump of the NOx sensor or reducing an amount of O2 removed via an oxygen pump of the NOx sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.