System of abnormality detection for oxygen concentration sensor
US4819602A · kind A · utility
21Cited by
1References
3Claims
0Family size
Inventors
Key dates
| Filing date | Mar 27, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Mar 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system of abnormality detection for an oxygen concentration sensor employed to sense the oxygen concentration in engine exhaust gas, for obtaining data to control the air/fuel ratio of a fuel mixture supplied to the engine, the oxygen concentration sensor including a sensor cell element and an oxygen pump element. The system serves to detect an abnormality such as an open-circuit or a short-circuit in electrode connecting leads of the oxygen pump element, on the basis of a level of the sensed pump current together with an air/fuel ratio compensation value which is derived from a sensed oxygen concentration level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.