Method for detecting deterioration of catalyst and measuring conversion efficiency thereof with an air/fuel ratio sensor
US5357750A · kind A · utility
66Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1993 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Jan 6, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention provides a method for accurately and precisely detecting deterioration of a catalyst and measuring a conversion efficiency of a catalyst for HC/CO/NOx by using an oxygen sensor and an air/fuel ratio sensor disposed on the upstream and downstream sides of the catalyst, respectively. The catalyst is determined to be deteriorating when an output amplitude of the air/fuel ratio sensor becomes greater than a predetermined value. The conversion efficiency of the catalyst is determined based on a predetermined relationship between the output amplitude and the mean converted rate of HC/CO/NOx.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.