Method and processing unit for ascertaining a catalytic converter state

A computing unit, catalyst technology, applied in the direction of engine components, machines/engines, electronic control of exhaust treatment devices, etc., can solve problems such as the reduction of catalytic converter conversion capacity

Pending Publication Date: 2021-10-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control concept therefore has the disadvantage that, with the aid of the voltage of the stepped lambda sensor downstream of the three-way catalytic converter, the control concept only recognizes the departure of the conversion window later.
This is based on the fact that with decreasing oxygen storage capacity, the conversion capacity of the catalytic converter also decreases as a rule of thumb

Method used

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  • Method and processing unit for ascertaining a catalytic converter state
  • Method and processing unit for ascertaining a catalytic converter state

Examples

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Embodiment Construction

[0040] exist figure 1 A vehicle 100 is schematically shown in the form of a block diagram in which the method according to the invention can be used. The vehicle 100 is preferably configured to perform according to figure 2 The method 200 has an internal combustion engine 120 such as a gasoline engine, a catalytic converter 130 and a computing unit 140 . Furthermore, the vehicle 100 can also comprise a fuel treatment device 110 eg in the form of an injection pump, a turbocharger etc. or a combination thereof.

[0041] Furthermore, the vehicle has (exhaust gas) sensors 145 , 147 , in particular lambda probes, which are arranged upstream and downstream of catalytic converter 130 in the exhaust system of vehicle 100 .

[0042] The computing unit firstly controls the operation of the internal combustion engine 120 , for example by controlling ignition timing, valve opening times and the composition, quantity and / or pressure of the fuel-air mixture supplied by the fuel treatment...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20F01N9/00
CPCF01N11/00F01N3/20F01N9/00F01N9/005F01N11/007F01N2550/02F01N2560/025F01N2900/0408F01N2900/1411F01N2900/1624Y02T10/40F01N2900/1402F01N2550/03F01N3/0864Y02T10/12Y02A50/20F01N2900/0406F01N2390/02
Inventor M·翁弗里希特B·克莱威尔M·费
Owner ROBERT BOSCH GMBH
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