Gas sensing element employable in an exhaust system of an internal combustion engine
US6554983B2 · kind B2 · utility
7Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Mar 19, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/419
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An objective gas is successively introduced into first and second chambers which are connected via a narrow passage. A first monitor cell, provided on a surface of the first chamber, generates an electromotive force representing an oxygen concentration in the first chamber. A second monitor cell, provided on a surface of the second chamber, generates an electromotive force representing an oxygen concentration in the second chamber. A voltage applied to a pump cell is controlled based on the electromotive forces obtained from the first and second monitor cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.