Catalytic converter monitoring using downstream oxygen sensor
US5159810A · kind A · utility
35Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1991 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Aug 26, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An exhaust gas oxygen sensor downstream of a catalytic converter is used to control a closed loop air/fuel ratio control system. A measured limit cycle frequency at various engine speed/load conditions is compared to stored benchmark limit cycle frequencies as functions of engine speed/load conditions. If the measured frequency is higher, the catalytic converter is considered to be degraded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.