Patent · US Active

Method for operating an exhaust gas aftertreatment apparatus

US9057335B2 · kind B2 · utility

0Cited by

0References

11Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Andreas Eckert · Ditzingen, DE
Herbert Schoemig · Stuttgart, DE
Tobias Pfister · Stuttgart, DE

Key dates

Filing date	Sep 28, 2010
Grant date	Jun 16, 2015
Priority date	—
Expiry date	Feb 16, 2034

Classification

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

Abstract

The present invention relates to a method for operating an exhaust gas aftertreatment apparatus (13) of an internal combustion engine (11), which comprises an oxidation catalytic converter (29), an SCR catalytic converter (35) and a first temperature sensor (32) disposed in the direction of flow downstream of the oxidation catalytic converter (29) and upstream of the SCR catalytic converter (35), an exhaust gas atmosphere capable of exothermal reaction in said oxidation catalytic converter (29) being generated by the metering of hydrocarbons into the exhaust gas (3) upstream of said oxidation catalytic converter (29) during a heating operation. The method is thereby characterized in that a first numerical measurement value of a nominal value of a hydrocarbon conversion in said oxidation catalytic converter (29) is formed, in that a second numerical measurement value of an actual value of the hydrocarbon conversion in said oxidation catalytic converter (29) is determined as a function of the signals of the first temperature sensor (32), in that the second numerical measurement value is compared with the first numerical measurement value and in that the metering of the hydrocarbons i…

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