Device for detection of air/fuel ratio from oxygen partial pressure in exhaust gas
US4304652A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1980 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Jun 6, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device having a probe of the oxygen concentration cell type to be disposed in a combustion gas to detect actual air/fuel ratio values of an air-fuel mixture subjected to combustion. The probe has a gas impermeable layer of a solid electrolyte such as zirconia, a porous reference electrode layer made of a catalytic material such as platinum and formed on the solid electrolyte layer, a porous gas-diffusion layer covering the reference electrode layer and a porous and noncatalytic measurement electrode layer formed on the solid electrolyte layer so as to be spaced from the reference electrode layer. A DC power supply is connected to the probe to force a constant current of an adequate intensity to flow through the solid electrolyte layer between the two electrode layers. Depending on the direction of the current flow, an output voltage of this device becomes indicative of air/fuel ratio values above or below the stoichiometric air/fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.