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Method of monitoring function of selective catalytic reaction (SCR) catalyst

A SCR catalytic converter and functional technology, which is applied in the direction of machines/engines, electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, etc., can solve problems such as can not give qualitative analysis, leakage pressure, leakage, etc.

Active Publication Date: 2011-04-20
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the rest of the system is sealed, pressure will still leak through this orifice, so no qualitative analysis can be given at all
Therefore, only very significant leaks can be identified

Method used

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  • Method of monitoring function of selective catalytic reaction (SCR) catalyst
  • Method of monitoring function of selective catalytic reaction (SCR) catalyst
  • Method of monitoring function of selective catalytic reaction (SCR) catalyst

Examples

Experimental program
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Embodiment Construction

[0023] FIG. 1 shows in a schematic diagram the various elements of an SCR catalytic converter system 1 known from the prior art. The SCR catalytic converter system 1 is provided for the aftertreatment of exhaust gases of an internal combustion engine (not shown). For this purpose, the fluid reducing agent, which is stored in the reducing agent tank 2 , is injected under pressure into the exhaust gas system via the metering valve 3 . The metering valve 3 is, for example, an electromagnetic injection valve, which is controlled by a controller 4 . The reducing agent is discharged from the reducing agent tank 2 via a suction line 6 by means of a pump 5 (which has an integrated non-return throttle valve) and is fed under pressure via a line system to the metering valve 3 . For pressure regulation, an orifice 7 is provided, which is arranged downstream of the return line 8 in the reducing agent tank 2 . To switch on the medium flow, a 4 / 2-way valve 9 is provided, which is controll...

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PUM

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Abstract

The invention relates to a method of monitoring the function of a selective catalytic reaction (SCR) catalyst, which is the method of monitoring the function of the SCR catalyst being as the waste gas aftertreatment system of an internal combustion engine. The SCR catalyst comprises at least one feed pump (5), at least one manifold valve (9), at least one metering valve (3) and at least one pressure sensor (10). In the sucking-back module of a SCR catalyst system (1), the negative pressure establishment in the SCR catalyst system can be observed by means of at least one measuring value of the pressure sensor (10). When the at least one measuring value deviates an expected reference value, the mistake of the function of the SCR catalyst system can be concluded.

Description

technical field [0001] The invention relates to a method for monitoring the function of an SCR catalytic converter system, which is an exhaust gas aftertreatment system of an internal combustion engine. Furthermore, the invention relates to a computer program and a computer program product for carrying out the method. Background technique [0002] Methods and devices for driving an internal combustion engine, in particular in motor vehicles, are known in which an SCR catalytic converter system (Selective Catalytic Reduction) is arranged in the region of its exhaust gas, which makes nitrogen oxides (Nox) contained in the exhaust gas of the internal combustion engine Reduction to nitrogen in the presence of a reducing agent. As a result, the nitrogen oxide content in the exhaust gas can be significantly reduced. Ammonia gas (NH 3 ), this ammonia gas is mixed into the exhaust gas. Therefore NH can be applied 3 or NH 3 Decomposed reactants, as reactants. Usually, an aqueo...

Claims

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Application Information

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IPC IPC(8): F01N11/00F01N9/00F01N3/20
CPCF01N2610/02F01N2610/14F01N2900/1822Y02T10/47F01N11/002Y02T10/24F01N2550/05F01N2610/1466F01N3/2066F01N2900/1808Y02T10/12Y02T10/40
Inventor D·西兰H·克莱因内克特
Owner ROBERT BOSCH GMBH
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