Patent · US Active

Method and device for diagnosing the dynamics of an exhaust gas sensor

US8489270B2 · kind B2 · utility

3Cited by

9References

16Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Kersten Wehmeier · Ludwigsburg, DE
Michael Pfeil · South Charleston, US
Siyun Chu · Marbach am Neckar, DE
Albrecht Clement · Kornwestheim, DE

Key dates

Filing date	Sep 28, 2010
Grant date	Jul 16, 2013
Priority date	—
Expiry date	Mar 13, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

The invention relates to a method and corresponding device for diagnosing the dynamics of an exhaust gas sensor, which is disposed in an exhaust gas duct of an internal combustion engine in the direction of flow of the exhaust gas upstream or downstream of a catalytic converter and with which the air/fuel ratio of the gas mixture supplied to the internal combustion engine is controlled via a control circuit. During diagnosis, provision is made for at least one actuator intervention to be specified by means of a control algorithm of a diagnostic controller specifically m the direction of an asymmetric behavior, which is achieved by an extension of one of the two ramps, until the actuator intervention is compensated by an asymmetric dynamic error of the exhaust gas sensor, a reaction to said actuator intervention being used as criterion for assessing an asymmetric dynamic error of said exhaust gas sensor.

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