Patent · US Expired

Method for detecting flow-reducing changes in an exhaust-gas catalyst body

US6205774A · kind A · utility

4Cited by

10References

13Claims

0Family size

Assignee

Daimlerchrysler AG · US

Inventors

Peter Hohner · Echterdingen, DE
Jorg Miroll · Köngen, DE
Hartung Wilstermann · Gaildorf, DE

Key dates

Filing date	Jan 7, 2000
Grant date	Mar 27, 2001
Priority date	—
Expiry date	Jan 7, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

A method for detecting flow-reducing changes in an exhaust-gas catalyst body is provided. The method includes measuring the ion-current signal from an ion-current probe in an internal combustion engine and monitoring the signal to determine whether its signal strength for a particular operating cycle falls below a minimum strength which can be specified as a function of the engine operating state. The method also include providing warning information to the control system when such an event occurs. The method further includes a variety of embodiments used to determine whether the ion current signal falls below a minimum strength.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.