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Apparatus and method for tamper detection of SCR catalyst system

A technology of SCR catalytic converter and sensor, which is applied to the electronic control of mufflers, exhaust devices, exhaust treatment devices, etc., and can solve problems such as failure to comply with exhaust gas regulations

Active Publication Date: 2020-03-10
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of such simulators in countries in which exhaust gas regulations cannot be complied with without SCR catalytic converter systems leads to impermissible exceeding of limit values

Method used

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  • Apparatus and method for tamper detection of SCR catalyst system
  • Apparatus and method for tamper detection of SCR catalyst system
  • Apparatus and method for tamper detection of SCR catalyst system

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Embodiment Construction

[0022] exist figure 1 The dosing mechanism of an SCR catalytic converter system for dosing HWL into the exhaust gas system 10 of a combustion engine 11 of a motor vehicle is shown in . The SCR catalyst system is used in a manner known per se for reducing nitrogen oxides in the exhaust gas of the combustion engine 11 by means of selective catalytic reduction. For reduction, the HWL is injected into the exhaust gas system 10 upstream of the SCR catalytic converter 12 . A reducing agent tank 13 is provided for this purpose, in which HWL is stored as reducing agent solution 14 . A suction line 15 is provided for its removal, which is connected to a delivery pump 16 . The feed pump conducts reducing agent solution 14 via pressure line 17 to distribution valve 18 upstream of SCR catalytic converter 12 . The system has an engine controller 19 for the combustion motor 11 and a further self-contained controller 21 which is part of the structural unit 20 . The structural unit also h...

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Abstract

The invention relates to an apparatus for tamper detection of an SCR catalyst system having a reducing agent tank (13) and sensors (22, 23, 24) arranged in the reducing agent tank (13). The sensors (22, 23, 24) form a structural unit (20) with a controller (21) arranged inside or on the reducing agent tank (13). The invention further relates to a method for tamper detection of an SCR catalyst system by means of an apparatus. From sensor data of at least one sensor (22, 23, 24) of the structural unit (20), the expected consumption of the reducing agent solution (14) within a predeterminable period of time is obtained, and the actual consumption of the reducing agent solution (14) within a predeterminable period of time is obtained from the data of the at least one measuring unit (25, 26) ofthe structural unit (20). Tamper to the SCR catalyst system is inferred from a comparison of the expected consumption to the actual consumption.

Description

technical field [0001] The invention relates to a device and a method for tamper detection of an SCR catalytic converter system. Furthermore, the invention also relates to a computer program implementing each step of the method and a machine-readable storage medium storing the computer program. Background technique [0002] In order to meet increasingly stringent exhaust gas regulations, it is necessary to reduce the nitrogen oxides in the exhaust gas of combustion motors, especially diesel motors. For this purpose, it is known to arrange an SCR catalyst (Selective Catalytic Reduction) in the exhaust gas system, which SCR catalyst reduces the nitrogen oxides contained in the exhaust gas of the combustion engine in the presence of a reducing agent. reduced to nitrogen. As a result, the proportion of nitrogen oxides in the exhaust gas can be significantly reduced. Ammonia mixed into the exhaust gas is required for this reaction to proceed. Usually, an aqueous urea solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N9/00F01N3/20
CPCF01N11/00F01N9/00F01N3/2066F01N3/208F01N2610/02F01N2550/14F01N2900/1806F01N2610/148F01N2900/12Y02T10/12Y02T10/40
Inventor J-J.吕格尔U.舒尔茨
Owner ROBERT BOSCH GMBH
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