Method for monitoring the effectiveness of a heated catalytic converter for treating the exhaust gases of an internal combustion engine
US5647204A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Sep 12, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The heated catalytic converter (1) is placed upstream of a three-way catalytic converter (2) in the outlet line (3) of the exhaust gases. The computer (7) comprises means for the closed-loop regulation of the air/fuel mixture supplied to the engine and means for implementing the method for monitoring the effectiveness of the three-way converter (2). According to the invention, when the engine is being started from cold, means for the closed-loop regulation of this mixture are activated when the temperature of the heated converter exceeds a predetermined temperature (T.sub.S) and insufficient effectiveness of the heated catalytic converter is deduced from the appearance of any fluctuation in the output signal of the probe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.