Apparatus for controlling air-fuel ratio in internal combustion engine
US4624232A · kind A · utility
13Cited by
8References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1985 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Jul 22, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1474
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an apparatus for the feedback control of the air-fuel ratio in an internal combustion engine using the output signal of an air-fuel ratio sensor, a degree of deterioration of the functioning of the air-fuel ratio sensor is detected by using successive measurements of a differential waveform of an output signal of the air-fuel ratio sensor over a predetermined period of time, and an air-fuel ratio feedback control constant is controlled in accordance with the degree of functional deterioration of the air-fuel ratio sensor to correct the air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.