Non-intrusive air/fuel sensor diagnostics
US10001045B2 · kind B2 · utility
12Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2016 |
| Grant date | Jun 19, 2018 |
| Priority date | — |
| Expiry date | Jan 18, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Methods and systems are provided for diagnosing a fault condition of an exhaust gas oxygen sensor downstream of a catalyst in an exhaust system of a vehicle. In one example, a method may include determining a ratio of a rate of change of a fractional oxidation state of the catalyst to a rate of change of an output voltage of the oxygen sensor. If the ratio is positive, a fault is diagnosed and subsequent adjustment of engine operation does not take into account feedback from the oxygen sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.