Apparatus for detecting abnormality of oxygen sensor and controlling air/fuel ratio
US5020499A · kind A · utility
25Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Jun 18, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1488
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
This invention provides apparatus for detecting abnormality of an oxygen sensor accurately and also apparatus for appropriately controlling the air/fuel ratio of air and fuel mixture when an oxygen sensor is abnormal. The apparatus easily and properly detects a deteriorating oxygen sensor, with the use of which exhaust of nitrogen oxides or carbon monoxide increases, and when the oxygen sensor is determined to deteriorate, the feed back control of the air/fuel ratio of air and fuel mixture supplied to an internal combustion engine is preferably performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.