Air-fuel ratio control apparatus for internal combustion engines
US4944274A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 4, 1989 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Oct 4, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An air-fuel ratio control apparatus for an internal combustion engine includes a solid electrolyte having a first electrode disposed on one surface thereof to contact with the atmosphere and a second electrode disposed on the other surface thereof to contact with the exhaust gas from the engine through a diffusing resistor, and means for applying a voltage across the first and second electrodes to detect an oxygen pump current flowing in the solid electrolyte whereby a correction factor relating to a change in the diffusion coefficient of the diffusing resistor is computed so that the oxygen pump current detected by the detecting means is corrected in accordance with the correction factor and the air-fuel ratio of the exhaust gas is determined in accordance with the corrected oxygen pump current, thereby controlling the quantity of fuel supplied to the engine in accordance with the determined air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.