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Monitoring of state of catalytic purifier for reducing nitrogen oxides

A technology of catalytic converters and nitrogen oxides, applied in the field of computer programs, can solve problems such as reduced efficiency, poor WPA components, and difficult state distinctions

Pending Publication Date: 2020-11-13
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Because conventional NOx sensors are cross-sensitive to ammonia, i.e. show NO x with NH 3 So-called ammonia leakage behind the SCR catalytic converter can lead to a significant loss of efficiency, since the ammonia also leads to a boosted sensor signal that can be misinterpreted as nitrogen oxides Increase
As a result, on the one hand, the BPU catalytic converter can be detected more easily, because it appears to be worse than it actually is; become difficult

Method used

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  • Monitoring of state of catalytic purifier for reducing nitrogen oxides
  • Monitoring of state of catalytic purifier for reducing nitrogen oxides
  • Monitoring of state of catalytic purifier for reducing nitrogen oxides

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Embodiment Construction

[0025] figure 1An exemplary system is shown in which embodiments of the invention may be applied. In this case, one or more catalytic converter elements are arranged in the exhaust gas line, into which exhaust gas flow 10 is introduced from the internal combustion engine for exhaust gas treatment. In the figure, firstly a diesel oxidation catalytic converter (DOC) 11 is shown, downstream of which two SCR catalytic converter elements 12 and 13 are connected, which can for example also be Includes particulate filter with SCR coating (SCRF)12. In each case a metering module 14 and 15 is arranged upstream of each SCR catalytic converter element 12 , 13 for the metered introduction of aqueous urea solution (HWL) into the system. Each metering module 14 , 15 is controlled by a control unit 19 , wherein preferably all modules of the same unit, for example an engine control unit, are actuated. Also installed are sensors 16, 17 and 18 which can measure the exhaust gas values ​​at di...

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Abstract

The invention relates to a method for monitoring a state of a catalytic purifier (12,13) for reducing nitrogen oxides. The method comprises the steps of calculating (31) at least one modeled tail gasmeasured value for aiming at a preset state of a model catalytic purifier; detecting (30) at least one corresponding measured tail gas measured value after the first catalytic purifier (12,13); and determining a fact that the catalytic purifier (12,13) is not damaged or damaged based on the at least modeled tail gas measured value and at least one measured tail gas measured value.

Description

technical field [0001] The invention relates to a method for monitoring the state of a catalytic converter for reducing nitrogen oxides, a computing unit for carrying out the method and a computer program for carrying out the method. Background technique [0002] In the field of vehicles, in order to reduce nitrogen oxides (NO x ), in particular an SCR catalytic converter (Selective Catalytic Reduction (Selective Catalytic Reduction)) can be used. Here, nitrogen monoxide NO and nitrogen dioxide NO 2 collectively referred to as nitrogen oxides. The basic principle of the SCR catalytic converter is: in the presence of ammonia (NH 3 ) as reducing agent, nitrogen oxide molecules are reduced to elemental nitrogen on the surface of the catalytic converter. Reducing agents usually release NH 3 It is provided in the form of an aqueous urea solution (HWL), which is provided through a controlled dosing device upstream of the SCR catalytic converter. [0003] Currently, a prerequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N9/00
CPCF01N11/00F01N9/005F01N2900/1402F01N2560/026F01N2560/021F01N3/2066F01N2550/02F01N2610/02F01N2900/0422F01N2900/0418F01N2900/1622F01N2900/1602F01N2570/14F01N2900/0601F01N2900/1411Y02T10/12Y02T10/40Y02A50/20
Inventor A.巴斯托雷亚勒T.菲斯特
Owner ROBERT BOSCH GMBH
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