Air-fuel ratio feedback control system having single air-fuel ratio sensor downstream of or within three-way catalyst converter
US5070692A · kind A · utility
9Cited by
7References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Dec 28, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an air-fuel ratio feedback system including a single air-fuel ratio sensor downstream of or within a three-way catalyst converter, a warming-up O.sub.2 storage term AF.sub.CCRO is calculated in a warming-up mode, and a coarse-adjusting term AF.sub.C and an after-warming-up term AF.sub.CCRO, are calculated in an after-warming-up mode. The warming-up O.sub.2 storage term AF.sub.CCRO is weakly dependent on an O.sub.2 storage amount of the catalyst converter but the after-warming-up O.sub.2 storage term AF.sub.CCRO, is strongly dependent on the O.sub.2 storage amount of the catalyst converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.