Passive oxygen sensor diagnostic
US6957562B2 · kind B2 · utility
16Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2003 |
| Grant date | Oct 25, 2005 |
| Priority date | — |
| Expiry date | Oct 28, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An engine exhaust sensor diagnostic system includes an oxygen sensor and a controller. The controller monitors a signal generated by the oxygen sensor, determines a rate of change of the signal, and computes diagnostic parameters. The controller indicates malfunction of the oxygen sensor if the diagnostic parameters are smaller in magnitude than corresponding thresholds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.