Exhaust gas purifying device for internal combustion engine
US4253302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1978 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Jul 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An oxygen sensor is disposed upstream of a three-way catalyst in an exhaust system of an internal combustion engine and includes a sensing element of metal oxide whose electromotive force or resistance value varies in response to the concentration of oxygen in the engine exhaust gases. A catalytic body including a catalytic metal material exhibiting the same catalytic performance as that of the three-way catalyst is disposed around the sensing element or upstream of the oxygen sensor or is formed by impregnating a portion of the sensing element with the catalytic metal material, so that the air-fuel ratio at the intake side or exhaust side of the engine can be controlled depending on the output of the oxygen sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.