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Method for monitoring an exhaust aftertreatment system of a combustion engine

By detecting the second pressure difference and pressure difference ratio in the exhaust gas post-treatment system, combined with specific operating conditions, the problem of difficult identification of pressure pipeline damage in the existing technology is solved, a reliable diagnosis of the pressure pipeline is achieved, and the exhaust gas is improved. Monitoring accuracy and reliability of post-processing systems.

Active Publication Date: 2020-05-01
ROBERT BOSCH GMBH
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  • Application Information

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Problems solved by technology

In the event of defects in this pressure line, e.g. when the line is lost due to improper fastening of the line or in the case of the same line, for example holes in the pressure line or cracks in the pressure line In case of damage, the measurement of differential pressure will be affected
Therefore, the control of the particle filter is also affected

Method used

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Embodiment Construction

[0017] exist figure 1 The main elements of the exhaust gas aftertreatment system are shown in . Use 100 to represent an internal combustion engine. Exhaust gases pass from the internal combustion engine via an exhaust pipe 110 to an exhaust gas aftertreatment system 120 and from there enter the environment via a second exhaust pipe 130 and optionally further structural elements 140 . Exhaust gas aftertreatment system 120 is a particle filter in the exemplary embodiment described below. The further element 140 is, for example, a muffler. In the first exhaust line 120 a first sampling point 115 is arranged between the internal combustion engine and the particle filter 120 . A second sampling point 135 is arranged in the second exhaust line 130 between the particle filter and the silencer 140 . The two sampling locations are respectively connected to the differential pressure sensor 150 by pressure pipelines. This pressure sensor 150 detects a first pressure difference betwe...

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Abstract

A method is described for monitoring an exhaust aftertreatment system of a combustion engine, with a pressure difference sensor that captures a first pressure difference between a first sampling pointand a second sampling point. A second pressure difference between the second sampling point and the environment is captured. A defect is detected based on the second pressure difference.

Description

technical field [0001] The invention relates to a method for monitoring an exhaust gas aftertreatment system of an internal combustion engine. Background technique [0002] Exhaust gas aftertreatment systems for cleaning the exhaust gas are used in modern internal combustion engines. Thus, particle filters are used, for example, to remove particles from exhaust gases. To monitor these exhaust gas aftertreatment systems, in particular particle filters, differential pressure sensors are used. Such a differential pressure sensor detects the differential pressure between the first sampling point and the second sampling point. Usually, the first sampling point is arranged before the particle filter and the second sampling point is arranged after the particle filter. From the differential pressure, the state of loading of the particle filter is deduced, and the regeneration of the particle filter is controlled as a function of the state of charge. [0003] Typically, the diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F02D41/22
CPCF01N11/00F01N11/002F02D41/222F01N2560/08F01N2560/14F01N2550/00F01N2900/1411F01N3/021F01N2550/04F01N2900/1406Y02T10/12Y02T10/40
Owner ROBERT BOSCH GMBH
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