Method and processing unit for ascertaining a catalytic converter state

Abstract

The present invention relates to a method (200) for ascertaining a catalytic converter state, wherein an exhaust-gas catalytic converter (130) is monitored on the basis of a catalytic converter model. Here, the catalytic converter model is adapted (250) in a manner dependent on measured values detected by means of one or more sensors (145, 147), wherein a frequency and / or a degree of the adaptation of the catalytic converter model is detected (260). The catalytic converter state is ascertained (270) as non-critical if the frequency and / or the degree of the adaptation do not exceed a predeterminable threshold value or is ascertained (270) as critical if the frequency and / or the degree of the adaptation exceed the predeterminable threshold value.

Description

technical field

[0001] The invention relates to a method for determining the state of a catalytic converter, as well as a computing unit and a computer program for carrying out the method. Background technique

[0002] Modern motor vehicles are frequently equipped with catalytic converters for aftertreatment of the exhaust gases of the internal combustion engine. In many cases, these catalytic converters are monitored and / or regulated.

[0003] In the case of incomplete combustion of the air-fuel mixture in a gasoline engine, except nitrogen (N 2 ), carbon dioxide (CO 2 ) and water (H 2 O) in addition to a large number of combustion products, among them hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NO X ) are legally limited. According to today's prior art, only catalytic exhaust gas aftertreatment can be used to maintain effective exhaust gas limit values ​​for motor vehicles. The pollutant components mentioned can be converted, for example, by using a ...

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