Evaluation of a motor vehicle oxygen sensor performance
US6539784B1 · kind B1 · utility
16Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Sep 25, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/126
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to the performance evaluation of an oxygen gas sensor in a motor vehicle, where the oxygen gas sensor is used to measure the oxygen content of the combusted air fuel mixture of a motor vehicle exhaust. The method involves measuring the fall time for the detected oxygen level to fall to a pre-determined lower threshold after the fuel supply to the engine has been cut off, and if the measured fall time exceeds a pre-set time, producing an oxygen sensor degradation signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.