Device for detecting air-fuel ratio of engine
US4767520A · kind A · utility
9Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1986 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | May 21, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting the air-fuel ratio of an engine by measuring the oxygen concentration of the exhaust gas by means of an oxygen sensor including an oxygen pump and a cell element for measuring the oxygen concentration ratio, comprising a filter circuit for smoothing the output signal of the oxygen sensor, said filter circuit having a time constant which is variably set so that it is in proportional relation to the number of revolutions per units of time of the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.