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

Abstract

#CMT# # / CMT# The method involves monitoring the building of a negative pressure in a selective catalytic reaction-catalyst system (1) corresponding to the measured value of a pressure sensor (10) in a rear suction mode of the selective catalytic reaction-catalyst system. The manifold valve (9) is operated for the rear suction mode, such that the medium from the lines of the selective catalytic reaction-catalyst system is sucked off with controlled feed pump (5). #CMT# : # / CMT# Independent claims are also included for the following: (1) a computer program for monitoring the function of a selective catalytic reaction-catalyst system of an internal combustion engine; and (2) a computer program product comprises a programming code. #CMT#USE : # / CMT# Method for monitoring the function of a selective catalytic reaction-catalyst system of an internal combustion engine. #CMT#ADVANTAGE : # / CMT# The manifold valve is operated for the rear suction mode, such that the medium from the lines of the selective catalytic reaction-catalyst system is sucked off with controlled feed pump, and thus prevents generation of defect in the function of the selective catalytic reaction-catalyst system. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a schematic view of a selective catalytic reaction-catalyst system. 1 : Selective catalytic reaction-catalyst system 3 : Dosing valve 5 : Feed pump 9 : Manifold valve 10 : Pressure sensor.

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...

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

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