Air-fuel ratio feedback control system having air-fuel ratio sensors upstream and downstream of three-way catalyst converter
US5092123A · kind A · utility
9Cited by
4References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1991 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Jun 20, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1487
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an air-fuel ratio feedback control system including air-fuel ratio sensors upstream and downstream of a three-way catalyst converter, the cold-condition compensating term is calculated in accordance with the upstream air-fuel ratio sensor disposed upstream of the catalyst converter, and the O.sub.2 storage term is calculated in accordance with the downstream air-fuel ratio sensor disposed downstream thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.