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

A reagent and circuit technology, applied in the field of running reagent quantitative system, can solve the problem of damaged circuit and other components

Active Publication Date: 2022-05-17
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Volume expansion of aqueous urea solution with freezing can lead to damage to lines and further components, such as pumps or metering valves

Method used

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

Examples

Experimental program
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Effect test

Embodiment Construction

[0031] figure 1 A reagent dosing system 10 is shown, which transports a reagent 14 stored in a tank 12 to an exhaust gas channel 16 of an internal combustion engine 18 via a line network N, wherein the line network N has a first line branch L1 and at least one further line branch L2, It is connected to the main line H via a branching element, and at its ends there are respectively dosing elements D1 and D2, wherein via the dosing elements D1 and D2 the reagent 14 can be directed upstream towards the first SCR catalytic converter 20 and the second SCR respectively. Catalyst 22 feed. During the dosing process, the reagent 14 is transported along the main line or along the first or second line branch L1 , L2 in the direction of the transport direction 15 . The reagent 14 is preferably an aqueous urea solution, which is a preparation for the reagent ammonia required in the SCR catalysts 20 , 22 . Only the term reagent 14 is used subsequently.

[0032] The reagent 14 is brought ...

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PUM

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Abstract

The invention relates to a method for operating a reagent dosing system (10) provided that reagents (14) are transported along a transport direction via a line network (N) towards a dosing element (D1) upstream before an SCR catalyst (20) Dosing the reagent to the exhaust gas channel (16) of the internal combustion engine (18), the line network has a main line (H) with a first line branch (L1) and at least one further line branch (L2) by a branching element delivering the reagent ( A) connection, after the end of the dosing run, the reagents are at least partially removed from the line network by the dosing element placed behind the first line branch and the further dosing element behind the further line branch, so that the first line branch and / or Or additional line branches extract only an amount of reagent that prevents venting of the branching element. There is also a line network, a control device ( 26 ) with which the reagent dosing system is operated, and a control device program product with a computer program stored on a machine-readable carrier for carrying out the method.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2066F01N9/00F01N2610/02F01N2610/1446F01N2610/1453F01N2610/146F01N2610/1473F01N13/0093Y02T10/40Y02T10/12
Inventor T.赫夫肯
Owner ROBERT BOSCH GMBH