Patent · US Active

Procedure and device to monitor an exhaust gas after-treatment system

US8196390B2 · kind B2 · utility

3Cited by

12References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Hartmut Lueders · Oberstenfeld, DE
Christian Walz · Durmersheim, DE
Matthias Loehr · Steinheim, DE

Key dates

Filing date	Dec 14, 2006
Grant date	Jun 12, 2012
Priority date	—
Expiry date	Nov 14, 2027

Classification

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

Abstract

Methods and devices to monitor an exhaust gas after-treatment system of an internal combustion engine with a motor block and an exhaust gas duct. The engine has at least one catalytic converter, upstream from which a reagent substance necessary for the NOx reduction in the catalytic converter is introduced by means of an introduction device. The reduction agent rate is increased to such an extent at defined reference operating points until an ammonia breach is detected in direction of flow behind the catalytic converter by means of an ammonia sensitive sensor in the exhaust gas duct.

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