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Method for monitoring at least one tail gas aftertreatment component of engine assembly having SCR system

A technology for engine assembly and exhaust after-treatment, which is applied to engine components, electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, etc. The effect of good stability

Inactive Publication Date: 2018-11-13
AVL LIST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the methods disclosed by the prior art are usually inaccurate and not robust enough

Method used

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  • Method for monitoring at least one tail gas aftertreatment component of engine assembly having SCR system
  • Method for monitoring at least one tail gas aftertreatment component of engine assembly having SCR system
  • Method for monitoring at least one tail gas aftertreatment component of engine assembly having SCR system

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Embodiment Construction

[0044] figure 1 The method of the present invention is shown, which has the following six steps S1, S2, S3, S4, S5, S6:

[0045] S1: After the start of the method, it is checked whether the activation condition of the monitoring is met, wherein this step is repeated until the activation condition is met.

[0046] S2 : When the activation condition is fulfilled, the measured mass flows upstream and downstream of the SCR catalytic converter and the calculated mass flows are integrated separately from one another.

[0047] S3: Check whether the end condition of integration is met, wherein, step S3 is repeated until the end condition is met.

[0048] S4: Calculate the efficiency of the SCR catalyst and its deviation.

[0049] S5: Determine whether the efficiency of the SCR catalyst is within a predetermined range, wherein the following situations are distinguished: if the efficiency is within the range, normal emission occurs; if the efficiency is not within the range, the OBD sys...

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Abstract

The invention relates to a method for monitoring at least one tail gas aftertreatment component of an engine assembly having an SCR system. NOx emission is monitored by adopting a power model, NOx mass flow downstream and upstream of an SCR catalytic converter is measured, and the method includes six steps (S1, S2, S3, S4, S5, S6).

Description

technical field [0001] The invention relates to a method for monitoring at least one exhaust gas aftertreatment component of an engine assembly with an SCR system, wherein NOx emissions are monitored using a dynamic model, wherein the NOx mass flow downstream and upstream of the SCR catalytic converter is measured . Background technique [0002] Internal combustion engines, for example internal combustion engines of vehicles such as cars or trucks generally include internal combustion engines with exhaust gas aftertreatment devices. Modern exhaust gas aftertreatment devices comprise one or more components such as oxidation catalytic converters, particle filters, SCR catalytic converters or NOx storage catalytic converters. A number of components of the exhaust gas aftertreatment system and in particular the SCR catalytic converter have to be monitored in order to be able to detect changes and in particular reductions in the efficiency of the SCR catalytic converter. [000...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCF01N3/0814F01N3/208F01N9/005F01N11/002F01N2550/00F01N2550/02F01N2560/026F01N2570/14F01N2570/18F01N2900/0418F01N11/00Y02T10/12Y02T10/40Y02A50/20
Inventor 阿尔敏·瓦博尼希阿洛伊斯·达宁格
Owner AVL LIST GMBH