Methods for detecting a dosing error

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United States of America Patent

PATENT NO 10677130
APP PUB NO 20180010502A1
SERIAL NO

15631432

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Abstract

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A method for detecting a dosing error of a reduction agent in a dosing module of an SCR catalytic converter system. The SCR catalytic converter system comprises the dosing module, which has a dosing valve and a flow valve as well as a delivery module with delivery pump. The SCR catalytic converter system, furthermore, has a return, in which a further flow valve is arranged. Said flow valve changes an effective cross-sectional area of the return. The method herein comprises the following steps: at the beginning, the dosing valve is closed (200). At a first pressure value (p1) in the system the delivery pump is switched off (201) and a measurement (202) of a first pressure rate (βRLdynamic) of the flow valve of the return subsequently takes place. Additional operation of the pump and the dosing valve occurs and a ratio of pressure rates is determined.

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Patent Owner(s)

Patent OwnerAddress
ROBERT BOSCH GMBHSTUTTGART

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Farr, Thomas Ludwigsburg, DE 8 7
Linsenmaier, Claus Kirchheim Unter Teck, DE 2 1

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