Air-fuel ratio feedback control system having single air-fuel ratio sensor downstream of or within three-way catalyst converter
US5052177A · kind A · utility
10Cited by
5References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Feb 21, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
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 coarse-adjusting term is calculated integrally in accordance with the output of the air-fuel ratio sensor, and a fine-adjusting term is calculated differentially at every reversion of the actual air-fuel ratio in accordance with the coarse-adjusting term and the fine-adjusting term. When a time of the reversion of the output of the air-fuel ratio sensor is small, the calculation of the coarse-adjusting term is prohibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.