Method for running reagent quantification system and equipment and circuit network for performing the method

Abstract

The invention relates to a method for operating a reagent dosing system (10) provided that reagents (14) are transported along a transport direction through a network of lines towards a dosing element that doses the reagent upstream of the SCR catalytic converter to the exhaust gas channel of the internal combustion engine, the line The network has a main line, a first line branch and an additional line branch to deliver reagents, after the quantitative run is completed, the reagents are transferred from the second quantitative element by the quantitative element placed after the first line branch and by the additional quantitative element placed after the other line branch. One line branch and / or at least one other line branch are withdrawn so that a total of so many reagents are extracted that the first dosing element or other The quantitative element is loaded with reagents. It also relates to a circuit network, a control device with which the reagent dosing system is operated, and a control device program product with a computer program for carrying out the method stored on a machine-readable carrier.

Description

technical field [0001] The invention relates to a method for operating a reagent metering system which doses reagent upstream of an SCR catalytic converter into an exhaust gas duct of an internal combustion engine, and also to a device and a circuit arrangement for carrying out the method. [0002] The invention also relates to a circuit network; a control device with which the reagent dosing system is operated; and a control device program product with a computer program for carrying out the method stored on a machine-readable carrier. Background technique [0003] Selective catalytic reduction (Selective Catalytic Reduction=SCR) can be used for reprocessing exhaust gases from internal combustion engines, with the aim of reducing nitrogen oxides (NOx) in the exhaust gases. In this case, a defined quantity of a selectively acting agent is dosed into the exhaust gas duct of the internal combustion engine. The reagent may be ammonia, which is obtained, for example, by hydroly...

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Problems solved by technology

[0010] The method according to the invention can be used in particular within the scope of the device according to the invention, since for this case, when reagents are extracted from at least one of the mutually hydraulically connected line branches, this can lead to the fact that in one line In the case of a difference in position or in height between a branch and a further line branch, a volume-compensating movement of the reagent in the first and further line branch can result, whereby even in the case of aspiration of reagent from at least one of the line branches Next, another branch of the line can be loaded with reagents

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