Gas composition sensor and method for separately detecting components of exhaust gas to diagnose catalytic converter performance
US5889196A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 6, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Jan 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/407
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas composition sensor for detecting oxygen, and hydrocarbon group fuel or combustible composition produced after combustion having a zirconia solid electrolyte body, a concentration cell composed of a platinoid metal catalytic detecting electrode and a reference electrode opposite to each other and a sensing element composed of a gas diffusion limiting member coating the detecting electrode, which further comprises a pair of the sensing elements and heaters for setting both of the sensing elements to operating temperatures different from each other, whereby a specified gas component is selectively detected by operating both of the sensing elements so as to have sensitivity coefficients to the specified gas component different from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.