Device for determining deterioration of a catalytic converter for an engine
US5279116A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1992 |
| Grant date | Jan 18, 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, and the areas surrounded by the output response curves and a reference voltage line of the upstream and downstream air-fuel ratio sensors AVOM and AVOS, respectively, the device determining whether or not the catalyst is deteriorated in accordance with the relationship between the ratio LVOS/LVOM and the ratio AVOS/AVOM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.