Device for determining deterioration of a catalytic converter for an engine
US5301501A · kind A · utility
29Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Oct 6, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A device for determining a deterioration of a catalytic converter for an engine equipped with a catalytic converter disposed in the exhaust passage and upstream and downstream air-fuel ratio sensors disposed in the exhaust passage upstream and downstream of the catalytic converter, respectively, wherein the device calculates the lengths of the output response curves of the upstream and downstream air-fuel ratio sensors LVOM and LVOS, respectively when the engine air-fuel ratio is feedback controlled, then the device determines whether or not the catalyst is deteriorated in accordance with the magnitude of the ratio LVOS/LVOM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.