Computer-implemented method and device for detecting manipulation of exhaust gas aftertreatment system
An exhaust gas post-processing and computer technology, which is applied in the diagnosis device of exhaust treatment device, mechanical equipment, exhaust treatment, etc., can solve the problems of inability to correlate, high cost, and lack of discrimination in new manipulation
Pending Publication Date: 2022-07-29
ROBERT BOSCH GMBH
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Problems solved by technology
The disadvantage of a rule-based approach to manipulation monitoring is that only known manipulation tactics can be identified or only known manipulations can be blocked
Therefore, this defensive strategy is not discriminating against new types of manipulation
Furthermore, it is expensive to take into account complex technical systems and their dependencies in the control system and to create corresponding rules for detecting manipulations
[0006] For example, in the case of exhaust gas aftertreatment systems, due to their dynamic nature, the operating states are varied and especially in the case of rarely occurring system states may not be unambiguously linked to the presence of manipulation
Method used
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[0050] figure 1 A schematic diagram of an exhaust gas aftertreatment system 2 for an engine system 1 with a combustion engine 3 is shown. The exhaust gas aftertreatment device 2 is designed for exhaust gas aftertreatment of the combustion exhaust gas of the combustion engine 3 . The combustion engine 3 can be designed as a diesel engine.
[0051] The exhaust gas aftertreatment device 2 has a particulate filter 21 and an SCR catalytic converter 22 . The exhaust gas temperature is measured upstream of the particulate filter 21 , downstream of the particulate filter 21 and downstream of the SCR catalytic converter 22 with respective temperature sensors 23 , 24 , 25 , and upstream and downstream of the SCR catalytic converter 22 with corresponding temperature sensors 23 , 24 , 25 . NO x Sensors 26, 27 to measure NO x content, and the exhaust gas temperature and the content are processed in the control unit 4 . The sensor signals are supplied to the control unit as system vari...
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The invention relates to a computer-implemented method for detecting the manipulation of a technical device, comprising the following steps: providing a time-dependent course of an operating variable having one or more system variables and / or having at least one setting variable for intervening in the technical device, each of the time sequences corresponds to a time sequence of values of the operating variable during a continuous time step; a data-based manipulation recognition model is used within each current time step in order to determine one or more output variables from the input variables, the manipulation recognition model comprising an auto-encoder, a prediction model and an evaluation model, the outputs of the auto-encoder and the prediction model being combined with one another and then fed to the evaluation model, the manipulation recognition model is trained to model a current value of the output variable as a function of a current value of at least a portion of the operating variable; identifying anomalies according to the modeling error of each output parameter; a manipulation is identified as a function of the identified anomaly.
Description
technical field [0001] The present invention relates to an exhaust gas aftertreatment system of a motor vehicle and in particular to a method for actuation detection of an exhaust gas aftertreatment system. Background technique [0002] Today's SCR exhaust gas aftertreatment systems (SCR: Selective Catalytic Reduction) for deoxygenation (reduction of nitrogen oxides by injecting urea into the exhaust gas) have legal requirements that are important for error-free operation Monitoring of system parameters (on-board diagnostics). Within the framework of this on-board diagnostics, a plausibility check of the compliance of important system parameters with physically plausible limit values is mainly carried out by the controller and its software. In this way, for example, unreasonable exhaust gas temperature values are prevented from being included in the calculation of the SCR operating strategy. [0003] It is also checked whether the expected system reaction occurs after ...
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IPC IPC(8): F01N3/20F02D41/14F02D41/22G06K9/00G06N3/04G06N3/08
CPCF01N3/208F02D41/1401F02D41/1405F02D41/22G06N3/084F01N2610/02F01N2610/146F02D2041/1423G06N3/044G06N3/045G06F2218/00F01N3/021F01N3/2066F01N11/002F01N2560/026F01N2560/06F01N2560/14F01N2550/02F01N2900/1404F01N2900/1402F01N2900/0402G06N3/088G06N3/047G06N3/08G06N3/0455
Inventor M·汉塞尔曼J·S·毕希纳T·斯特劳斯T·布兰兹
Owner ROBERT BOSCH GMBH