Oxygen pumping device for control of the air fuel ratio
US4841934A · kind A · utility
9Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Feb 20, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1476
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of controlling the air fuel ratio of an internal combustion engine includes positioning a two cell oxygen pumping device in the exhaust gas of the engine. A pumping current is applied to a pumping cell and an EMF is sensed across a sensor cell. The sensed EMF is compared to reference voltage and an error signal is generated. The air fuel ratio is changed in response to the error signal so as to reduce the absolute magnitude of the error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.