Method, control device and computer program product for on-board detection of a manipulation of a pollutant emission mass detection device of an internal combustion engine

Abstract

The invention relates to a method, a control device (7) and a computer program product (20) for detecting illegal manipulation of a pollutant emission mass detection device (30) of an internal combustion engine (1) equipped with an exhaust gas aftertreatment device (2) during ongoing operation of the internal combustion engine (1), in particular in a motor vehicle. The method is carried out by means of the control device (7), wherein pollutant emission mass values (S_Emw) are determined on the basis of an exhaust gas mass flow (11a) of the internal combustion engine (1) using sensor signal values (AS_Sig) of an exhaust gas sensor (6c) that are representative of a concentration of at least one pollutant in the exhaust gas mass flow (11a). A pollutant emission mass value (S_Emw) determined in this way over a respective operating cycle of the internal combustion engine (1) is compared with an assignable pollutant emission mass expected value (S_EmEw) and a manipulation of the pollutant emission mass detection device (30) is detected if the determined pollutant emission mass value (S_Emw) is more than a predetermined distance below the pollutant emission mass expected value (S_EmEw) for this operating cycle.

Description

[0001] 202400925

[0002] 1

[0003] Description

[0004] Method, control device and computer program product for

[0005] On-board detection of manipulation of a

[0006] Pollutant emission mass recording device of an internal combustion engine

[0007] The invention relates to a method, a control device and a computer program product for detecting illegal manipulation of a pollutant emission mass recording device of an internal combustion engine (ICU) equipped with an exhaust aftertreatment device (AgNbgs device), using an on-board monitoring system (OBM system), during the ongoing intended operation of the ICU, in particular in a motor vehicle (MV).

[0008] Current and future legal requirements for limiting pollutant emissions from motor vehicles necessitate effective and reliable combustion control for the combustion engines used, with a view to reducing pollutant emissions, as well as exhaust aftertreatment, without which, according to the current state of technology, compliance with the required emission limits, especially for nitrogen oxides (NOx), ammonia (NH3), hydrocarbons (CmHn) and carbon monoxide (CO), is not possible.

[0009] To ensure compliance with the required limit values, AgNbgs devices may be equipped with combinations of several exhaust catalysts and particle filters.

[0010] Exhaust gas sensors, such as... are used to control and regulate the combustion processes of the BKM and the AgNbgs device.

[0011] Lambda sensors, NOx sensors, HC sensors, or even particle sensors are used to determine one or more components of the exhaust gas, or their percentage share in the exhaust gas mass flow, directly or in relation to each other. These exhaust gas sensors can be located at several different positions in the exhaust system, upstream and / or downstream in the exhaust gas mass flow, or even within the exhaust gas recirculation (EGR) devices. Such exhaust gas sensors are not only used for the general optimization of emissions behavior, but increasingly for the continuous monitoring of pollutant emissions throughout the entire life cycle, i.e., from the initial commissioning of the EGR system until its final decommissioning.

[0012] 2

[0013] Decommissioning. This so-called on-board monitoring (OBM) continuously provides measurement data for assessing the emission behavior of the BKM and can also be used to evaluate legal compliance. Currently, the focus is primarily on NOx emissions.

[0014] To comply with legal requirements, the installation of exhaust gas sensors, initially primarily NOx sensors, downstream of the respective exhaust gas recirculation (EGR) devices, in conjunction with a corresponding operational monitoring (OBM) system, will be required in the future. This system will be used to record the mass of pollutants, particularly NOx, emitted into the environment over the lifetime or individual operating cycles of the EGR device. This monitoring system will be used to monitor NOx emissions during operation and to detect excessively high pollutant emissions, especially NOx emissions, for example, to identify so-called high-emitter vehicles, and to initiate appropriate corrective measures. The corresponding exhaust gas sensors, together with a suitable electronic control device that constitutes or incorporates a corresponding OBM system, will form what is known here as an operational monitoring system.

[0015] Pollutant emission mass recording device

[0016] Furthermore, there are likely to be legal requirements for detecting manipulation of the AgNbgs device and, in particular, also of the facilities of the OBM system or the

[0017] Pollutant emission mass monitoring device. This is intended to detect and prevent illegal manipulations that conceal increased pollutant emissions and thus feign compliant operation, even though the pollutant emissions are too high. Therefore, the requirement exists to use the OBM system to detect possible manipulations of the

[0018] To detect pollutant emission mass monitoring devices, especially the relevant NOx sensor, this is currently done based on sensor self-diagnosis or by other means of safeguarding the sensor signal (e.g., by programming certified sensors). However, since these safeguards can also be manipulated, there is currently no way to detect excessive pollutant emissions, particularly NOx emissions, from the BKM (Body Control Module) or the corresponding vehicle.

[0019] The object underlying the invention is therefore to provide a method that enables the reliable detection of illegal manipulation of a pollutant emission mass detection device, in particular on 202400925

[0020] 3

[0021] This enables the use of an associated exhaust gas sensor and its sensor signal values, thus ensuring realistic recording and documentation of the pollutant masses, particularly NOx masses, emitted by the BKM during normal operation. Furthermore, a control device and a computer program for carrying out the procedure will be provided.

[0022] This problem is solved by the inventive method, the inventive electronic control device and the inventive computer program product according to the independent patent claims.

[0023] The advantages of the invention lie in the fact that manipulation of the pollutant emission mass detection device of an internal combustion engine, which may display a false value below the actual pollutant emission, can be reliably detected without additional hardware components.

[0024] Advantageous embodiments, further developments and details of the present invention will become apparent from the dependent claims, the description and the drawing.

[0025] The underlying idea of ​​the invention is to use the aforementioned OBM system not only to detect excessively high emissions caused by malfunctions, but also to detect exceptionally low emissions that indicate manipulation of the

[0026] The pollutant emission mass recording device can be closed. This is not currently planned.

[0027] For example, if one considers the so-called trip emissions of a vehicle test fleet, certain values ​​are expected during the intended operation of a BKM (Battery Control Unit).

[0028] Minimum emission values ​​for certain pollutants are to be expected, even for properly functioning and unaged vehicles or BKMs with AgNbgs devices. Therefore, if the emission values ​​determined over certain operating cycles of the BKM fall below these expected minimum emission values, one can assume manipulation of the

[0029] Pollutant emission mass recording device or the relevant 202400925

[0030] 4

[0031] The pollutant sensor malfunctions and this is recorded as an error entry in the engine control unit using a diagnostic function.

[0032] Based on this idea, a method, an electronic control device, and a computer program product are developed for

[0033] On-board detection of manipulation of a

[0034] A pollutant emission mass detection device of a BKM with an AgNbgs device is proposed, wherein the method is carried out by means of an electronic control device associated with the BKM and / or the AgNbgs device by executing the program instructions contained in the computer program product.

[0035] A corresponding pollutant emission mass detection device consists, for example, of an electronic control device and at least one associated exhaust gas sensor, which is advantageously arranged in the exhaust gas mass flow according to the AgNbgs device and provides signals that are representative of at least one pollutant fraction or pollutant concentration in the exhaust gas mass flow, wherein the electronic control device receives signals or sensor signal values ​​from the at least one exhaust gas sensor. Furthermore, the electronic control device can be configured to receive at least one additional signal that, alone or in combination with other signals, is representative of the current size of the exhaust gas mass flow or from which the current size value of the exhaust gas mass flow can be determined.The electronic control device is further configured to process the received signals according to stored program instructions.

[0036] In this process, pollutant emission mass values ​​during the operation of the BKM are determined on the basis of an exhaust gas mass flow of the BKM using sensor signal values ​​from the exhaust gas sensor arranged in the exhaust gas mass flow by means of the control device, whereby the sensor signal values ​​are representative of a concentration of at least one pollutant in the exhaust gas mass flow leaving the AgNbgs device.

[0037] Subsequently, a pollutant emission mass value determined over a specific operating cycle of the BKM is compared with a pollutant emission mass expectation value attributable to this specific operating cycle, and a manipulation of the 202400925

[0038] 5

[0039] The pollutant emission mass detection device, in particular the associated exhaust gas sensor, is detected when the pollutant emission mass value determined for the respective operating cycle falls below the specified level by more than a predetermined distance.

[0040] The specified distance lies within the expected pollutant emission mass value for this operating cycle. This distance can be based on empirical values ​​obtained through appropriate tests, possibly depending on the method used to determine the expected pollutant emission mass value. Accordingly, the specified distance can be chosen within a range of 0% to 50% of the expected pollutant emission mass value. The more precise the

[0041] The more accurately the pollutant emission mass expectation value reflects reality, the lower the distance can be chosen.

[0042] A first embodiment of the method according to the invention is characterized in that the manipulation of the

[0043] This concerns the exhaust gas sensor or its sensor signal values ​​associated with the pollutant emission mass detection device. Manipulations of the exhaust gas sensor or its sensor signal values ​​appear particularly easy to carry out, especially compared to corresponding manipulations of the control device or the computer program; therefore, it is particularly advantageous to detect such manipulations.

[0044] Another embodiment of the method according to the invention is characterized in that the respective pollutant emission mass expectation value is determined by means of the electronic control device by integrating a predetermined average or minimum pollutant mass flow rate, typical for the respective internal combustion engine, over the duration of the respective operating cycle. For this purpose, typical average or minimum pollutant mass flow rates can be used, for example, which have been determined for a test fleet or test series of internal combustion engines of the same design in measurement series for comparable operating cycles and provided in corresponding characteristic maps. This enables an advantageous implementation of the method according to the invention with a comparatively low computational effort during operation.

[0045] An alternative embodiment of the method according to the invention is characterized in that the respective 202400925

[0046] 6

[0047] The pollutant emission mass expectation value is determined by means of the electronic control device by performing a load-dependent weighted integration of the operating point-dependent pollutant mass flow over the duration of the respective operating cycle.

[0048] This design is based on the OBM system deciding at the end of each operating cycle whether the relevant emission limits have been met or whether the vehicle is classified as a "high emitter." This decision is made by weighting the respective emissions over the entire operating cycle. This is because a vehicle or a battery management system (BKM), even when functioning correctly, can produce increased emissions if, for example, it is temporarily operated under high load, such as when driving uphill. These increased emissions are then either not considered or only factored into the decision with appropriate weighting. Therefore, at the end of an operating cycle, the weighted emission values ​​are used to determine the vehicle's overall emissions.

[0049] If the expected pollutant emission mass value is used and compared with the pollutant emission mass values ​​determined without weighting, then in an unmanipulated system, the pollutant emission mass values ​​determined without weighting would be expected to be significantly higher than the expected pollutant emission mass value determined with weighting. However, if the determined pollutant emission mass value (without weighting) is more or less below the determined expected pollutant emission mass value (with weighting), manipulation of the system must be assumed.

[0050] Pollutant emission mass recording device, in particular the

[0051] The NOx sensor is used as a starting point. This design advantageously enables manipulation detection with increased discriminatory power due to a greater realism in the respective pollutant emission mass expectation value.

[0052] An alternative embodiment of the method according to the invention, compared to the two aforementioned embodiments, is characterized in that the respective pollutant emission mass expectation value is determined by means of the electronic control device by integrating a pollutant mass flow, continuously calculated in the respective operating cycle using an operating-point-dependent exhaust gas model, over the duration of the respective operating cycle. Depending on the accuracy of the exhaust gas model, a pollutant emission mass expectation value determined in this way should correspond to the pollutant emission mass values ​​measured for the relevant operating cycle.

[0053] 7

[0054] relatively close. This design also advantageously enables manipulation detection with increased discrimination accuracy due to the relative realism of the respective pollutant emission mass expectation value.

[0055] Another embodiment of the method according to the invention is characterized in that a respective operating cycle is defined by at least one of the following criteria:

[0056] a specified continuous minimum operating time of the internal combustion engine,

[0057] a predetermined minimum distance traveled by a motor vehicle powered by an internal combustion engine from a start to the subsequent stop of the internal combustion engine;

[0058] the existence of an operator activation interval from an operator activation of the internal combustion engine to a subsequent operator deactivation,

[0059] where operator activation means the active commissioning of the BKM by an operator, for example a vehicle driver, and where

[0060] Operator deactivation refers to the active shutdown or switching off of the brake booster by an operator. In contrast, starting or stopping the brake booster during operation can also occur as part of a so-called start-stop system, controlled by the electronic engine control unit.

[0061] Specifying a minimum operating time, a minimum driving distance, an operator activation interval, or a combination of the aforementioned specifications advantageously ensures a certain stabilization of the operating behavior of the BKM and, above all, the AgNbgs device, including the respective exhaust gas sensor, and thereby reduces the influence of "outlier measurements", for example, due to a different cold start behavior of the BKM, short-term high-load operation, or regeneration cycles of the AgNbgs device.

[0062] Another embodiment of the method according to the invention is characterized in that, upon detection of manipulation of the

[0063] Pollutant emission mass monitoring device, at least one of the following measures is initiated by the electronic control device:

[0064] - Activation of a warning indicator to inform the operator about the system malfunction; 202400925

[0065] 8

[0066] - Recording a corresponding error message in an error memory, to enable error diagnosis, for example by a specialist;

[0067] - Preventing the internal combustion engine (1) from restarting after operator deactivation in order to correct / repair the

[0068] to enforce the installation of a pollutant emission mass recording device;

[0069] - Restricting the operation of the internal combustion engine to a low-emission operating range, in order to allow, even in the event of a fault or tampering, for example, limited continued driving, home, or to a workshop. These measures can be implemented individually or in any combination and ensure that non-compliant operation of the respective internal combustion engine cannot go undetected and cannot be ignored by a user / operator of the engine in the long term. This effectively ensures that the environmental impact of pollutants in the exhaust gas remains as low as possible.

[0070] Another embodiment of the method according to the invention is characterized in that the sensor signal values ​​of the exhaust gas sensor arranged in the exhaust gas mass flow of the BKM are representative of a concentration of at least one of the following pollutants:

[0071] - Nitrogen oxide, NOx;

[0072] - Ammonia, NH3;

[0073] - Hydrocarbon, CmHn.

[0074] This enables the advantageous monitoring of relevant pollutant emissions.

[0075] An electronic control device according to the invention, which is configured for on-board detection of manipulation of a

[0076] A pollutant emission mass capture device of an internal combustion engine with an exhaust aftertreatment device has at least the following components:

[0077] an electronic storage device in which at least one computer program product containing program instructions for carrying out the procedure is provided;

[0078] an input / output interface designed to receive and output electrical signals; as well as 202400925

[0079] 9

[0080] an electronic computing unit (processor) for executing program instructions, with access to at least one electronic storage device and the input / output interface.

[0081] The electronic control device can receive the necessary signals and is configured such that, when the program instructions are executed by the electronic processing unit, they cause the electronic control device to execute the method according to one of the preceding claims. This advantageously and simply enables on-board detection of manipulation of a

[0082] Pollutant emission mass recording device of an internal combustion engine.

[0083] The computer program product according to the invention for on-board detection of manipulation of a pollutant emission mass detection device of an internal combustion engine with an exhaust aftertreatment device comprises program instructions for execution by the aforementioned electronic computing unit of the electronic control device, wherein the program instructions, when executed by the electronic computing unit, cause the electronic control device to carry out the method according to the invention in one of the aforementioned embodiments. This advantageously and simply enables the on-board detection of manipulation of a pollutant emission mass detection device of an internal combustion engine.

[0084] The features and combinations of features of the embodiments of the invention mentioned above in the description or below in the description of the figures are to be applied individually, in part or in their entirety, also in mutual combination or mutual supplementation, in further development of the invention, without leaving the scope of the invention, insofar as they are not alternatively applicable or even mutually exclusive.

[0085] Features and details described in connection with the method naturally also apply to the electronic control device and the computer program product, and vice versa, so that mutual reference can always be made to the individual aspects of the invention with regard to the disclosure of this invention. 202400925

[0086] 10

[0087] The figures below illustrate particularly advantageous embodiments, details or further developments of the invention, although the subject matter of the invention is not intended to be limited to these examples.

[0088] They show:

[0089] Fig. 1 is a simplified schematic representation of an internal combustion engine with exhaust aftertreatment device.

[0090] Fig. 2 shows a simplified flowchart of a possible embodiment of the method according to the invention.

[0091] The figures in the drawing of this application are to be regarded merely schematically, and the relative sizes of the individual figures and the elements depicted within them are not to be considered to scale. Rather, individual elements may be exaggeratedly large for better representation and / or clarity.

[0092] Elements with identical functions, names, or effects are marked with the same reference symbols across all figures. In individual figures, some reference symbols may be omitted for clarity.

[0093] Figure 1 shows a BKM 1, which can be designed, for example, as a reciprocating internal combustion engine with four cylinders (indicated). The BKM 1 is supplied from the intake side via an air-fuel mixture supply unit 10 with

[0094] Air-fuel mixture 10a is supplied. The air-fuel mixture supply unit 10 represents, for example, a fuel injection system in conjunction with a throttle valve, which is connected to the electronic control device 7 via signal lines 8 and is controlled in such a way that an air-fuel mixture 10a is supplied to the combustion chambers of the BKM 1 in a predetermined quantity and composition. Thus, the electronic control device 7 can, according to the program instructions implemented therein, influence both the available power and the composition of the exhaust gas mass flow 11a, in particular the so-called lambda value, which provides information about the oxygen content in the exhaust gas, and the NOx concentration in the exhaust gas.

[0095] On the outlet side of the BKM 1 is connected an AgNbgs device 2 with a first exhaust catalyst 3, a second exhaust catalyst 4 and a 202400925

[0096] 11

[0097] Particulate filters 5 are connected to the BKM 1 via an exhaust pipe 11 and are interconnected. The exhaust gas mass flow 11a is directed through the exhaust pipe 11 to the aforementioned components of the AgNbgs device 2. The exhaust gas mass flow 11a is represented by arrow symbols indicating the direction of flow. The first exhaust gas catalyst 3 is located close to the engine, directly at the exhaust outlet of the BKM 1, and is designed here, for example, as a three-way catalyst (TWC). Downstream of the first exhaust gas catalyst 3, with respect to the exhaust gas mass flow 11a, is a particulate filter 5, which is designed, for example, as a

[0098] Gasoline particulate filter (GPF) and then the second exhaust catalyst 4, which can also be designed as a three-way catalyst (TWC) and can be arranged, for example, as a so-called underbody catalyst (UbKat) on the underbody of a motor vehicle.

[0099] In the exhaust pipe 11, a first exhaust gas sensor 6a is arranged upstream of the first exhaust gas catalyst 3, a second exhaust gas sensor 6b is arranged downstream of the first exhaust gas catalyst 3, and a third exhaust gas sensor 6c is arranged downstream of the second exhaust gas catalyst 4 in the exhaust gas mass flow 11a. Additionally, a temperature sensor 9 for measuring the temperature of the exhaust gas mass flow 11a is arranged in the exhaust pipe 11 between the first exhaust gas catalyst 3 and the particulate filter 5.

[0100] The sensors 6a-c and 9 mentioned above are connected via electrical signal lines 8 to the input / output interface 7c of an electronic control device 7 according to the invention for transmitting the sensor signals to the control device 7. The air-fuel mixture supply unit 10 of the internal combustion engine 1 is also connected via electrical signal lines 8 to the input / output interface 7c of the electronic control device 7 according to the invention.

[0101] The electronic control device 7 comprises an electronic computing unit 7a, also referred to as a processor, an electronic storage device 7b, and an input / output interface 7c. In this embodiment, the electronic storage device 7b includes a program memory 7b1 in which a computer program product 20 according to the invention, containing program instructions, is available. Furthermore, the electronic storage device 7b includes an operating data memory 7b2 in which predefined operating data 21, as well as operating data acquired during operation, are stored, for example, arranged in characteristic maps.

[0102] 12

[0103] The electronic computing unit 7a is configured to carry out the method according to the invention in the embodiments described above and, if applicable, in addition thereto. For this purpose, the electronic computing unit 7a has access to, or is in a data connection (symbolized by connecting arrows) with, the input / output interface 7c, the program memory 7b1, and the operating data memory 7b2. When the program instructions are executed by means of the electronic computing unit 7a, using the relevant operating data 21 and various threshold values ​​for the oxygen content in the exhaust gas mass flow, the electronic control device 7 is caused to execute the method according to the invention for on-board detection of a manipulation of the pollutant emission mass detection device 30 of the BKM 1.The pollutant emission mass detection device 30 essentially consists at least of the electronic control device 7 including the corresponding computer program product 20 and the exhaust gas sensor 6c arranged at the exhaust gas outlet of the AgNbgs device 2, which can be designed, for example, as a NOx sensor, as an NHs sensor or as a CmHn sensor.

[0104] In accordance with the program instructions, the

[0105] Input / output interface 7c, sensor data, for example the signals from the exhaust gas sensors 6a-c which represent, for example, the oxygen content or the various pollutant content in the exhaust gas mass flow 11a, operating data! 2, which are, for example, representative of the size of the exhaust gas mass flow or from which the size of the exhaust gas mass flow can be determined, and further signals, for example from the temperature sensor 9, are received and the programmed calculation operations for lambda control and, in particular, for manipulation detection of the pollutant emission mass detection device 30, in particular of the exhaust gas sensor 6c, are carried out according to the method according to the invention.Based on this, control commands are then issued, for example, to control the air-fuel mixture 10a to the air-fuel mixture supply unit 10 of the internal combustion engine 1, and, in the event of tamper detection, control commands to activate a warning indicator 25 and / or to enter a corresponding error message in an error memory and / or to prevent a restart of the internal combustion engine 1 after operator deactivation and / or to restrict the operation of the internal combustion engine 1 to a low-emission operating range. 202400925.

[0106] 13

[0107] Figure 2 shows a simplified flowchart of a possible embodiment of the method according to the invention. However, this is not intended to limit the claimed method to the example shown. In the illustrated sequence, it is first determined in a process step S1 that the BKM 1, and thus a new operating cycle of the BKM 1, has been started.

[0108] Once the BKM 1 has been started, the pollutant emission mass value S_Emw is continuously determined in process step S2.1 based on the exhaust gas mass flow 11a of the BKM 1 using

[0109] Sensor signal values ​​AS_Sig from an exhaust gas sensor 6c located in the exhaust gas mass flow 11a. For this purpose, a pollutant mass flow S_Mst is continuously determined based on the exhaust gas mass flow 11a and the sensor signal value AS_Sig, and this is integrated over the operating time, i.e., over the operating cycle. This is represented by process step S2, labeled fS_Mst = S_Emw.

[0110] Simultaneously, or in parallel to process step S2.1, a pollutant emission mass expectation value S_EmEw is determined, represented by process step S2.2. This can alternatively be done in different ways.

[0111] For example, an expected pollutant emission mass value S_EmEw can be determined by integrating a typical, predefined average or minimum pollutant mass flow S_Mst for the respective BKM 1 over the duration of the respective operating cycle. The typical pollutant mass flow can be specified in corresponding characteristic maps, depending on the operating point, and stored in the operating data memory 7b2 of the control device 7.

[0112] For example, an expected pollutant emission mass value S_EmEw can alternatively be determined by performing a load-dependent weighted integration of the operating point-dependent pollutant mass flow over the duration of the respective operating cycle.

[0113] For example, an expected pollutant emission mass value S_EmEw can alternatively be determined by integrating a pollutant mass flow, continuously calculated in the respective operating cycle using an operating-point-dependent exhaust gas model, over the duration of the respective operating cycle. 202400925

[0114] 14

[0115] In the subsequent process step S3, it is determined whether the previously started operating cycle has been completed. If this is the case, in the following decision step E4, it is checked, for example, whether the operating cycle meets certain criteria that can be used as a prerequisite for the tamper detection of the pollutant emission mass recording device 30.

[0116] This allows, for example, verification of whether a specified minimum continuous operating time of the BKM was met.

[0117] Alternatively or additionally, it can be checked whether a specified minimum distance has been covered by a motor vehicle driven by the BKM 1 from a start to the subsequent stop of the BKM.

[0118] Alternatively or additionally, it can be checked whether an operating interval exists from an operator activation of the internal combustion engine to a subsequent operator deactivation.

[0119] If the corresponding predefined condition is not met, no assessment of the operating cycle regarding manipulation of the

[0120] Pollutant emission mass recording device 30 is used and the process is returned to the beginning to await a restart of BKM 1.

[0121] If the corresponding condition is met, a comparison is made in decision step E5 between the pollutant emission mass value S_Emw determined for the relevant operating cycle and the value also determined for the relevant operating cycle.

[0122] Pollutant emission mass expectation value S_EmEw. This determines whether the value determined for the relevant operating cycle is sufficient.

[0123] The pollutant emission mass value S_Emw lies below the pollutant emission mass expectation value S_EmEw for this operating cycle by more than a specified distance, which in the limiting case means that the pollutant emission mass value S_Emw is less than or equal to the pollutant emission mass expectation value S_EmEw.

[0124] If this is not the case, the process returns to the beginning to await a restart of BKM 1. 202400925

[0125] 15

[0126] Otherwise, in process step S6, a manipulation of the

[0127] Pollutant emission mass monitoring device 30 detects an emission mass and appropriate measures can be initiated in process step S7. These can include, for example:

[0128] - activation of a warning indicator 25;

[0129] - an entry of a corresponding error message into an error memory;

[0130] - preventing the internal combustion engine (1) from restarting after operator deactivation; or

[0131] - a restriction of the operation of the internal combustion engine to a low-emission operating range.

[0132] The various measures can also be implemented in combination or in a complementary manner. 202400925

[0133] Reference symbol list

[0134] 1 internal combustion engine

[0135] 2 Exhaust aftertreatment device

[0136] 3 first exhaust catalyst

[0137] 4 second exhaust catalyst

[0138] 5 particle filters

[0139] 6a - c Exhaust gas sensors

[0140] 7 electronic control device

[0141] 7a Electronic computing unit

[0142] 7b Electronic storage device

[0143] 7b1 Program memory

[0144] 7b2 Operational data storage

[0145] 7c Input / Output Interface

[0146] 8 signal lines

[0147] 9 Temperature sensor

[0148] 10 Air-fuel 43 mixed supply unit

[0149] 10a Air-fuel mixture

[0150] 11 Exhaust pipe

[0151] 11a Exhaust gas mass flow

[0152] 20 Computer program product

[0153] 21 Operational data

[0154] 25 Warning indicator

[0155] 30 Pollutant emission mass capture device GPF Gasoline particle filter

[0156] Ap differential pressure sensor

[0157] TWC three-way catalytic converter

[0158] UbKat underfloor catalytic converter

[0159] AS_Sig sensor signal value

[0160] S_Mst pollutant mass flow

[0161] S_Emw pollutant emission mass value

[0162] S_EmEw Pollutant emission mass expectation value S1 - S7 Process steps

[0163] E4, E5 Decision steps

Claims

202400925 17 Patent claims 1. Method for on-board detection of manipulation of a Pollutant emission mass detection device (30) of an internal combustion engine (1) with an exhaust aftertreatment device (2), wherein the method is carried out by means of an electronic control device (7) associated with the internal combustion engine (1) and / or the exhaust aftertreatment device (2), wherein pollutant emission mass values ​​(S_Emw) during the operation of the internal combustion engine (1), based on an exhaust gas mass flow (11a) of the internal combustion engine (1) using sensor signal values ​​(AS_Sig) of a sensor arranged in the exhaust gas mass flow (11a) and the pollutant emission mass detection device (30) associated exhaust gas sensor (6c), by means of the control device (7) are determined, wherein the sensor signal values ​​(AS_Sig) are representative of a concentration of at least one pollutant in the exhaust gas mass flow (11a) leaving the exhaust gas aftertreatment device (2), wherein a pollutant emission mass value (S_Emw) determined over a respective specific operating cycle of the internal combustion engine (1) is compared with a pollutant emission mass expectation value (S_EmEw) attributable to this specific operating cycle and manipulation of the pollutant emission mass detection device (30) is detected if the pollutant emission mass value (S_Emw) determined for the respective operating cycle is more than a predetermined distance below the pollutant emission mass expectation value (S_EmEw) for this operating cycle.

2. Method according to claim 1, characterized in that the manipulation relates to the exhaust gas sensor (6c) associated with the pollutant emission mass detection device (30) or its sensor signal values ​​(AS_Sig).

3. Method according to claim 1, characterized in that the respective pollutant emission mass expectation value (S_EmEw) is determined by means of the electronic control device (7) by integrating a predetermined value typical for the respective internal combustion engine (1). 18 medium or minimum pollutant mass flow (S_Mst) over the duration of the respective operating cycle.

4. Method according to claim 1, characterized in that the respective pollutant emission mass expectation value (S_EmEw) is determined by means of the electronic control device (7) by performing a load-dependent weighted integration of the operating point-dependent pollutant mass flow (S_Mst) over the duration of the respective operating cycle.

5. Method according to claim 1, characterized in that the respective pollutant emission mass expectation value (S_EmEw) is determined by means of the electronic control device (7) by integrating a pollutant mass flow (S_Mst) calculated continuously in the respective operating cycle using an operating point-dependent exhaust gas model over the duration of the respective operating cycle.

6. Method according to one of the preceding claims, characterized in that a respective operating cycle is defined by at least one of the following criteria: - a specified continuous minimum operating time of the internal combustion engine, - a specified minimum distance traveled by a motor vehicle powered by the internal combustion engine (1) from a start to the subsequent stop of the internal combustion engine; - the existence of an operating interval ranging from an operator activation of the internal combustion engine to a subsequent operator deactivation.

7. Method according to one of the preceding claims, characterized in that, upon detection of manipulation of the pollutant emission mass monitoring device (30), at least one of the following measures is initiated by the electronic control device (7): - Activation of a warning indicator (25); - Recording a corresponding error message in an error memory; - Preventing a restart of the internal combustion engine (1) after operator deactivation; 202400925 19 - Restriction of the operation of the internal combustion engine to a low-emission operating range.

8. Method according to one of the preceding claims, characterized in that the sensor signal values ​​(AS_Sig) of the exhaust gas sensor (6c) arranged in the exhaust gas mass flow (11a) of the internal combustion engine (1) are representative of a concentration of at least one of the following pollutants: - Nitrogen oxide, NOx; - Ammonia, NH3; - Hydrocarbon, CmHn.

9. Electronic control device (7) which is configured to On-board detection of manipulation of a Pollutant emission mass detection device (30) of an internal combustion engine (1) with an exhaust aftertreatment device (2) with at least an electronic storage device (7b) in which at least one computer program product (20) containing program instructions for carrying out the procedure is provided and an input / output interface (7c) designed to receive and output electrical signals, as well as an electronic computing unit (processor) (7a) for executing program instructions, with access to at least one electronic storage device (7b) and the input / output interface (7c); The electronic control device can receive the necessary signals and is configured such that the program instructions, when executed by means of the electronic computing unit (7a), cause the electronic control device (7) to execute the method according to one of the preceding claims.

10. Computer program product (20) for on-board detection of manipulation of a pollutant emission mass detection device (30) of an internal combustion engine (1) with an exhaust aftertreatment device (2), comprising program instructions for execution by the electronic computing unit (7a) of the electronic control device (7) according to claim 8, wherein the program instructions, when executed by the electronic computing unit (7a), the electronic control device (7)202400925 20 cause the procedure according to any one of claims 1 to 8 to be carried out.

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