Device for detecting air-fuel ratio of engine
US4842711A · kind A · utility
4Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Nov 20, 2007 |
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 an 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 an air-fuel ratio detecting circuit which reads the output signal of the oxygen sensor and effects the detection of the air-fuel ratio when TDC signal has been produced, depending upon the operation of the engine, and a time previously set by a timer has passed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.