Air filter device, method for operating air filter device, and control module for air filter device

Abstract

The invention discloses an air filtering device which is provided with a filter module and a control module, the filter module at least comprises a first-stage air filter element and a second-stage air filter element, and the first-stage air filter element and the second-stage air filter element are connected in series. At least one sensor for detecting an air flow parameter is arranged downstream of the primary air filter element and is in signal connection with a control module, a valve device is associated with at least the secondary air filter element, and the control module can actuate an actuator of the valve device according to the air flow parameter detected by the at least one sensor. The air filter is used for at least adjusting the coupling degree of the secondary air filter element and the air inlet channel. According to the scheme, the air filtering device can be automatically adjusted and optimized according to the real-time working condition and the state of the filtering module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine components, in particular to an air filtering device, a method for operating an air filtering device, a control module for an air filtering device and a computer readable storage medium. BACKGROUND

[0002] The air filtering device, also known as an air cleaner, is an important component of the engine intake system and plays a crucial role in ensuring the normal operation of the engine.

[0003] Traditional air cleaners also lack intelligent control functions and cannot automatically adjust and optimize according to the real-time working conditions of the engine and the state of the air cleaner, resulting in low filtering efficiency and even potential damage to the engine.

[0004] In addition, existing air cleaners have obvious shortcomings in state monitoring and life prediction. Users cannot real-time access to key information such as real-time performance, cumulative use time, and remaining life of the air cleaner, which leads to failure to replace the air cleaner in time and thus affects the performance of the engine. For example, due to the lack of accurate life prediction, users often have difficulty grasping the timing of replacing the air cleaner, which may result in waste of resources and increased maintenance costs.

[0005] Therefore, it is necessary to further improve the existing air filtering device and its operating method. SUMMARY

[0006] The present application proposes an air filtering device, a method for operating an air filtering device, a control module for an air filtering device and a computer readable storage medium, aiming to overcome one or more of the above technical problems in the prior art and / or other technical problems.

[0007] According to one aspect of the present application, an air filtering device is provided, which has a filter module and a control module, the filter module comprising at least a primary air filter element and a secondary air filter element, the primary air filter element and the secondary air filter element being connected in series, wherein at least one sensor for detecting airflow parameters is provided downstream of the primary air filter element, the at least one sensor being signal-connected to the control module, wherein at least the secondary air filter element is provided with a valve device, and the control module can control an actuator of the valve device according to the airflow parameters collected by the at least one sensor, for adjusting at least the coupling degree of the secondary air filter element to the air intake passage. For example, for coupling the primary and / or secondary air filter elements to the air intake passage or decoupling the secondary air filter element from the air intake passage or maintaining the valve device at an optimal opening level.

[0008] According to another aspect of the present application, a method for operating any of the above-mentioned embodiments of the air filter device is proposed, the method comprising the steps of:

[0009] acquiring the airflow parameter by means of at least one sensor;

[0010] determining a clogging condition of the primary air filter element based on the airflow parameter;

[0011] generating a control signal for controlling the valve device based on the clogging condition for adjusting at least the degree of coupling of the secondary air filter element to the intake passage. For example, for coupling the secondary air filter element to the intake passage or decoupling the secondary air filter element from the intake passage or maintaining the valve device at a predetermined opening degree such that the secondary air filter element is fully involved, not involved or partially involved in the filtration.

[0012] According to another aspect of the present application, a control module for any of the above-mentioned embodiments of the air filter device is proposed, the control module comprising an evaluation unit and a communication unit, wherein the control module is signal connected to the at least one sensor, the valve device and a control device of the working machine by means of the communication unit, wherein the evaluation unit evaluates a clogging condition of the primary air filter element based on the airflow parameter and generates a control signal for controlling the valve device based on the clogging condition.

[0013] Finally, the present application also proposes a computer-readable storage medium having stored thereon a computer program comprising executable instructions which, when executed by a processor, implement any of the above-mentioned embodiments of the method for operating the air filter device.

[0014] In the air filter device proposed by the present application, the control module of the air filter device can adaptively open or close the secondary air filter element according to the sensor data, thereby controlling the filtration level and filtration capacity. The secondary air filter element only works when necessary, which reduces the intake resistance in normal use, improves power and economy, greatly prolongs the service life of the secondary air filter element and slows down its performance degradation, thereby reducing the number of filter element replacements, improving the machine maintenance-free time, and reducing the part cost and downtime cost caused by replacing the air filter element. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0016] Figure 1 is a first embodiment of a filter module of the air filter device according to the present application;

[0017] Figure 2 is a second embodiment of a filter module of the air filter device according to the present application;

[0018] Figure 3 is a third embodiment of a filter module of an air filter device according to the present application;

[0019] Figure 4 is a flow chart of a method for operating an air filter device according to the present application;

[0020] Figure 5 is an exemplary architecture diagram of a control module according to the present application. DETAILED DESCRIPTION

[0021] Exemplary embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, this example embodiment can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and fully convey the scope of the exemplary embodiments to those skilled in the art. In the drawings, the size and relative sizes of parts can be exaggerated for illustration purposes and the drawings are not necessarily drawn to scale. Like reference numerals can be used to refer to like parts throughout the several views.

[0022] Also, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the

[0023] Figure 1 A first preferred embodiment of a filter module of an air filter device according to the present application is shown in Figure 1 The air inlet direction is indicated by the arrow in Figure 1As shown, air flows in from the inlet side of the primary air filter 1. Downstream of the primary air filter 1, in the direction of the air flow, a secondary air filter 2 and a tertiary air filter 3 are arranged in sequence. Here, the tertiary air filter 3 is optional, i.e. it is not necessary and can be dispensed with, for example, for cost reasons. However, it is advantageous to provide a tertiary air filter 3, for example, in order to be able to filter the air entering the engine even in the event of a simultaneous failure of the primary and secondary air filters, in order to avoid damage to the engine. In addition, the tertiary air filter 3 can be designed to be smaller than the primary and secondary air filters and, preferably, to be easily removable. For example, the tertiary air filter 3 can be checked regularly. Depending on the clogging or soiling state of the tertiary air filter 3, it can be determined whether the primary and secondary air filters are functioning properly. That is, under normal circumstances, the air flowing into the tertiary air filter 3 is already filtered by the primary and / or secondary air filter, so that the tertiary air filter 3 is usually not or only slightly soiled or clogged, and only in the event of at least partial failure of the primary and secondary air filters will the tertiary air filter 3 become soiled and clogged.

[0024] In Figure 1 In the embodiment shown, a sensor is provided between the primary air filter 1 and the secondary air filter 2. Here, the sensor is in the form of a pressure sensor 4, which is arranged downstream of the primary air filter 1 and upstream of the secondary air filter 2. The sensor serves to detect an air flow parameter of the air flow flowing from the primary air filter 1, here the pressure value. Although one pressure sensor 4 is shown, it is also conceivable to provide other types of sensors, such as differential pressure sensors, temperature sensors and flow rate sensors. Accordingly, the air flow parameter can be the air flow pressure at the outlet side of the primary air filter, the differential pressure between the inlet side and the outlet side of the primary air filter, the air flow temperature and / or the flow rate at the outlet side of the primary air filter. It is also conceivable to provide several different types of sensors simultaneously, for example a flow rate sensor and a pressure sensor. The sensor is in signal connection with a control module, which is not shown here. The air flow parameter detected by the sensor is input to the control module.

[0025] Figure 1It is also shown that the secondary air filter element 2 is equipped with a valve device, which is designed as a first bypass valve 5 here. The first air filter element 1 is equipped with a second bypass valve 6. The first bypass valve and the second bypass valve are connected to the control module signal and can be driven by the control module. Specifically, the control module can control the opening or closing of the first bypass valve 5 and the second bypass valve 6 according to the collected airflow parameters. Although the second bypass valve 6 is also shown here, in some application scenarios, the second bypass valve can be omitted. It is also possible to consider providing position sensors on the first bypass valve and the second bypass valve to detect the opening of the valve plate. In this way, the opening and closing degree of the bypass valve can be more accurately controlled by the control device to best adjust the bypass valve to suit the airflow parameters and / or engine operating conditions.

[0026] Figure 2 A second preferred embodiment of the filter module of the air filter device is shown. Here, the primary air filter element 1 and the secondary air filter element 2 are also connected in series. A pressure sensor 4 connected to the control module signal is also provided between the primary air filter element 1 and the secondary air filter element 2. The secondary air filter element 2 is integrally constructed with the valve device to form, in particular, a butterfly valve. The secondary air filter element 2 is integrated into the closing part of the electric butterfly valve. The butterfly valve, also known as the flap valve, is a throttle valve with a simple structure, and its closing part (valve flap or butterfly plate) can be rotated around the valve shaft to achieve opening and closing. The butterfly valve can be driven by an actuator in the form of a motor 7, specifically the motor 7 drives the valve shaft to drive the closing part to rotate. Since the secondary air filter element 2 is integrated in the closing part, when the closing part is closed, that is, when it is oriented perpendicular to the direction of the airflow, the airflow flows through the secondary air filter element 2; and when the closing part is open, that is, when the closing part is oriented parallel to the direction of the airflow, the airflow does not flow through the secondary air filter element 2. The motor 7 can be driven by a control device to close or open the closure member, coupling or decoupling the secondary air filter element 2 to or from the intake passage, depending on the specific application scenario and operating conditions of the air filtration device. Although shown as a motor 7, other types of actuators, such as hydraulic cylinders or pneumatic cylinders, are also contemplated.

[0027] Although not shown, a position sensor can also be provided on the closing member to detect the position of the opening and closing member, i.e., the opening and closing angle. The control module can control the opening and closing angle based on the airflow parameters to select the optimal opening and closing angle, further improving the utilization efficiency of the secondary air filter element 2 and optimizing costs.

[0028] Figure 3is a third embodiment of the filter module. Here, the primary air filter element 1 and the secondary air filter element 2 are connected in parallel. The valve device assigned to the secondary air filter element 2 is designed as a throttle 9. The throttle 9 is arranged upstream of the secondary air filter element 2 and forms a secondary filter module together with the secondary air filter element 2. The throttle 9 has a shutter-like cross section comprising a plurality of valve blades 10 and corresponding rotary shafts 11. The valve blades 10 are fixedly connected to the respective rotary shafts 11. The valve blades 10 can be driven in rotation individually or in groups by the electric motor 7. Similarly, the electric motor 7 can be controlled by the control module depending on the air flow parameters. By providing the throttle 9, the air flow can be controlled more precisely, and the air can also be divided into a plurality of parallel sub-flows to form a steady flow and to replace the original engine throttle valve function to some extent. In addition, although not shown in Figure 3 corresponding sensors are to be provided in analogy to the first and second embodiments.

[0029] Figure 4 is a flow chart of a method for operating an air filter device according to the present application. The method comprises the following steps:

[0030] S1: acquiring an air flow parameter by means of at least one sensor;

[0031] S2: determining a clogging condition of the primary air filter element depending on the air flow parameter;

[0032] S3: generating a control signal for controlling the valve device depending on the clogging condition for at least adjusting the degree of coupling of the secondary air filter element to the intake passage. For example, for coupling the secondary air filter element into the intake passage or decoupling the secondary air filter element from the intake passage, or for maintaining the valve device at an optimal opening level.

[0033] The at least one sensor is one of a pressure sensor, a differential pressure sensor, a temperature sensor and a flow rate sensor. Correspondingly, the air flow parameter can be the air flow pressure at the outlet side of the primary air filter element, the pressure difference between the inlet side and the outlet side of the primary air filter element, the air flow temperature at the outlet side of the primary air filter element and / or the flow rate. In addition to the air flow parameter, engine operating condition parameters can additionally be taken into account when generating the control signal.

[0034] The air flow parameters change with the degree of clogging of the primary air filter element. For example, the pressure value, the flow rate and other parameters downstream of the primary air filter element decrease with increasing degree of clogging, whereas the pressure difference between the upstream and downstream of the primary air filter element increases. The degree of clogging of the primary air filter element can thus be determined from the air flow parameters. Preferably, in the case of a value of the air flow parameter, such as the pressure value, being greater than a predetermined first threshold value, it is concluded that the primary air filter element is not clogged, in which case the valve arrangement is actuated so that the secondary air filter element is decoupled from the intake passage and the service time of the primary air filter element is accumulated. In the case of the pressure value being greater than a predetermined second threshold value and less than the first threshold value, it is concluded that the primary air filter element is partially clogged, in which case the valve arrangement is actuated so that the secondary air filter element is coupled into the intake passage and the service time of the primary air filter element and the service time of the secondary air filter element are accumulated. In the case of the pressure value being greater than a predetermined third threshold value and less than the second threshold value, it is concluded that the primary air filter element is heavily clogged, in which case the valve arrangement is actuated so that the secondary air filter element is coupled into the intake passage and the accumulated service time T1 of the primary air filter element and the accumulated service time T2 of the secondary air filter element are displayed on the display device of the construction machine or vehicle. In the case of the pressure value being less than the third threshold value, it is concluded that the primary air filter element has failed, in which case the valve arrangement is actuated so that the secondary air filter element is coupled into the intake passage and the replacement of the primary air filter element is prompted on the display device. It is also conceivable to decouple the primary air filter element from the intake passage when the primary air filter element is heavily clogged. For example, in the embodiment shown in Fig. 1 the second bypass valve is opened and the first bypass valve is closed, whereby the intake resistance is reduced and the secondary filter element assumes the main filtering role. Figure 1 In the case of having determined that the primary air filter element is heavily clogged or has failed, the occurrence of a pressure value increase is recorded, and it is concluded that the primary air filter element is damaged. In this case, a warning message should be immediately issued to the user, requiring the replacement of the primary air filter element.

[0035] Here, the first threshold value, the second threshold value and the third threshold value can be determined in advance by experiment. The clogging determination described above can also be applied to the secondary air filter element and the tertiary air filter element. Of course, this is provided that the secondary or tertiary air filter element is also provided with a corresponding sensor.

[0036] Preferably, in the case of the difference between the accumulated service time T1 of the primary air filter element and the design life Ts1 of the primary air filter element being less than a predetermined value, such as 10 hours, the replacement of the primary air filter element is prompted on the display device or acoustically or optically. In the case of the difference between the accumulated service time T2 of the secondary air filter element and the design life Ts2 of the secondary air filter element being less than another predetermined value, the replacement of the secondary air filter element is prompted on the display device or acoustically or optically. The other predetermined value and the aforementioned predetermined value are related to the structure and material of the air filter element and can be determined in advance by experiment or self-learned from the actual service life.

[0037] It is also preferred that the remaining service life of the primary air filter element can be predicted based on the air flow parameter, the current clogging condition of the primary air filter element and the accumulated service time T1 by means of a remaining service life prediction model and displayed on the display device. The remaining service life prediction model is a pre-trained neural network model. The remaining service life prediction model is for example an artificial intelligence model based on a BP (Back Propagation) neural network algorithm. The BP neural network algorithm is a kind of multi-layer feedforward network trained by error backpropagation algorithm. The advantage of the BP neural network algorithm lies in its strong generalization ability, self-learning and self-adaptive ability, and is particularly suitable for solving problems with complex internal mechanisms. The remaining service life prediction model can be pre-trained by means of a large amount of experimental data and historical data. In addition, other algorithms can also be considered for constructing the remaining service life prediction model, such as deep learning algorithms such as convolutional neural network CNN, recurrent neural network RNN, etc. Here, not only is the real-time state of the air filtration device monitored, but also the working performance of the air filtration device is analyzed and modeled by combining big data analysis and deep learning, and the prediction of the remaining service life is realized. Thus, the user can be shown the predicted remaining life while the accumulated service time is displayed, so that the user can prepare the corresponding parts in advance and arrange the engineer's schedule.

[0038] It is also advantageous that in the case of a severe clogging of the secondary air filter element, the primary air filter element and the secondary air filter element are simultaneously coupled to the intake passage. After the primary filter element has been determined to be clogged and decoupled, if the secondary air filter element is also severely clogged, the primary and secondary air filter elements that are clogged are forced to be simultaneously coupled to the intake passage to ensure the filtering effect. At the same time, it is also possible to send a warning message to the user and limit the engine power if necessary.

[0039] The at least one sensor is designed as a differential pressure sensor, wherein, at each power-on start, the differential pressure sensor is subjected to pressure zero-point calibration against atmospheric pressure, and / or, at each power-on, the valve device is subjected to a self-test. During the self-test, the valve device is forced to switch several times, in particular three times, in order to scrape off any particles that can be present on the valve. Through the self-test, it can be checked whether the valve device is stuck. In the event that the valve device is detected to be stuck, the stuck state is determined in combination with the air flow data of the sensor, whether the stuck state is in the closed state or in the open state, and then a corresponding information and warning is sent to the user.

[0040] The accumulated usage time T1 of the primary air filter element is reset to zero after replacement of the primary air filter element. The usage time T1 is counted from the beginning of the slight clogging of the primary air filter element to the end of the counting of the severe clogging, and the disappearance of the clogging in the next driving cycle is detected without damage to the primary filter element, and the filter element is determined to be replaced, and T1, T2 are reset. Alternatively, a sensor is arranged at the rear end of the secondary air filter element for detecting the clogging of the secondary air filter, and T2 is triggered by the sensor.

[0041] Figure 5 is a schematic diagram showing a preferred embodiment of the architecture of the control module for the aforementioned air filter device. As shown in Figure 5 The control module 16 comprises an evaluation unit 12 and a communication unit 15, and the control module 16 can be signal connected with the sensors, the valve device, especially the actuator of the valve device, such as a motor, and the control device of the working machine by means of the communication unit 15. The evaluation unit 12 evaluates the clogging condition of the primary air filter element based on the airflow parameters and generates a control signal for driving the valve device according to the clogging condition. The actuator of the valve device adjusts the valve device according to the control signal. In addition, the working condition of the engine can also be additionally considered, for example, when the engine needs to run at high power in a short time, the valve device can be controlled by the control device to reduce the intake resistance and increase the intake amount.

[0042] Figure 5 It is further shown in the figure that the control module can also comprise a prediction unit 13, a storage unit 14 and other possible functional units. The prediction unit 13 can predict the remaining service life of the primary air filter element by means of a remaining service life prediction model based on the airflow parameters, the current clogging condition of the primary air filter element and the accumulated usage time, and send the remaining service life to the display device of the working machine or vehicle via the bus system. The control module 16 also comprises a storage unit 14. Of course, the control module can also adopt a remote storage mode, i.e. not comprising a local storage unit. The remaining service life prediction model and other algorithm programs can be stored in the storage unit.

[0043] In the exemplary embodiments of the present application, a computer readable storage medium is also provided, on which a computer program is stored, the program comprising executable instructions which, when executed by, for example, a processor, can implement the steps of the method for operating the air filter device according to the present application described in any one of the embodiments described above. In some possible implementations, various aspects of the present application can also be implemented in the form of a program product, which comprises program code for causing the control module to perform the steps described in the method for operating the air filter device according to various exemplary embodiments of the present application described in the specification when the program product is run on the terminal device.

[0044] The computer readable storage medium can include a data signal transported over a carrier wave and can be baseband or propagated along with carriers. The program code embodied on the computer readable storage medium can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, and the like, or any suitable combination of the foregoing.

[0045] The program code, when executed, can implement the processes and methods described herein. The program code can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server. In the latter scenario, the remote computing device can be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computing device, such as through the Internet using an Internet Service Provider (ISP).

[0046] Those skilled in the art will readily appreciate that the example embodiments described herein can be implemented by software and / or firmware in addition to or instead of hardware. The application relates to a computer program product which can comprise a computer-readable storage medium having stored thereon a computer program of instructions executable by a computer processor. The computer program product can be for executing the method of operating an air filter device according to the embodiments of the application on the computer processor. The computer program product can be for causing a computer to perform the method of operating an air filter device according to the embodiments of the application.

[0047] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that fall within the scope of the present application, including computer generated, interactive, or virtual implementations. It is intended that the present application cover the construction of embodiments to perform the same function of the present application but to achieve medical results utilizing different procedures, methods, and / or devices. It is intended that the present application encompass present subject matter insofar as recited in the appended claims and equivalents thereof.

Claims

1. An air filtration device having a filter module and a control module, the filter module comprising at least a primary air filter element and a secondary air filter element, characterized in that, The primary air filter element and the secondary air filter element are connected in series, wherein at least one sensor for detecting a gas flow parameter is provided downstream of the primary air filter element, which is signal-connected to a control module, wherein at least the secondary air filter element is provided with a valve device, which can be actuated by the control module depending on the gas flow parameter acquired by the at least one sensor for at least adjusting the degree of coupling of the secondary air filter element to the intake passage.

2. The air filtration device of claim 1, wherein, The at least one sensor is at least one of a pressure sensor, a differential pressure sensor, a temperature sensor and a flow rate sensor, and the gas flow parameter is the gas flow pressure at the outlet side of the primary air filter element, the differential pressure between the inlet side and the outlet side of the primary air filter element, the gas flow temperature at the outlet side of the primary air filter element and / or the flow rate.

3. The air filtration device of claim 1, wherein, The at least one sensor is arranged between the primary air filter element and the secondary air filter element in the direction of gas flow, wherein the valve device is designed as a first bypass valve connected in parallel to the secondary air filter element.

4. The air filtration device of claim 3, wherein, The primary air filter element is also provided with a second bypass valve, which is signal-connected to and can be actuated by the control module, wherein the second bypass valve is connected in parallel to the primary air filter element, wherein the first bypass valve and / or the second bypass valve is provided with a position sensor.

5. The air filtration device of claim 1, wherein, The filter module also comprises a tertiary air filter element, which is arranged downstream of the secondary air filter element.

6. The air filtration device of claim 1, wherein, The valve device is designed as an electric butterfly valve and is connected in series downstream of the primary air filter element, wherein the secondary air filter element is integrated in the butterfly plate of the electric butterfly valve.

7. The air filtration device of claim 1 or 2, wherein, The secondary air filter element is provided with at least one further sensor for detecting a gas flow parameter at the outlet side of the secondary air filter element.

8. A method for operating an air filter device according to any one of claims 1 to 7, comprising the following steps: acquiring a gas flow parameter by means of the at least one sensor; determining a clogging condition of the primary air filter element from the gas flow parameter; generating an actuation signal for actuating the valve device depending on the clogging condition for at least adjusting the degree of coupling of the secondary air filter element to the intake passage.

9. The method of claim 8, wherein, in the event that the value of the gas flow parameter is greater than a predetermined first threshold value, it is concluded that the primary air filter element is not clogged, wherein the valve device is actuated such that the secondary air filter element is decoupled from the intake passage and the usage duration of the primary air filter element is accumulated; in the event that the value of the gas flow parameter is greater than a predetermined second threshold value and less than the first threshold value, it is concluded that the primary air filter element is partially clogged, wherein the valve device is actuated such that the secondary air filter element is coupled into the intake passage and the usage duration of the primary air filter element and the usage duration of the secondary air filter element are accumulated.

10. The method of claim 9, wherein, in the event that the value of the gas flow parameter is greater than a predetermined third threshold value and less than the second threshold value, it is concluded that the primary air filter element is severely clogged, wherein the valve device is actuated such that the secondary air filter element is coupled into the intake passage and the accumulated usage duration T1 of the primary air filter element and the accumulated usage duration T2 of the secondary air filter element are displayed on a display device.

11. The method of claim 10, wherein, In the case that the value of the air flow parameter is less than a third threshold value, it is concluded that the filter function of the primary air filter element is ineffective, wherein the valve device is actuated to couple the secondary air filter element into the intake passage and to prompt a replacement of the primary air filter element on the display device.

12. The method of claim 10, wherein, In the case that the difference between the cumulative usage time T1 of the primary air filter element and the design life Ts1 of the primary air filter element is less than a predetermined value, a replacement of the primary air filter element is prompted on the display device, and / or in the case that the difference between the cumulative usage time T2 of the secondary air filter element and the design life Ts2 of the secondary air filter element is less than another predetermined value, a replacement of the secondary air filter element is prompted on the display device.

13. The method according to claim 11 or 12, characterized in that, The cumulative usage time T1 of the primary air filter element is zeroed after a replacement of the primary air filter element, and the cumulative usage time T2 of the secondary air filter element is zeroed after a replacement of the secondary air filter element.

14. The method of claim 8, wherein, A remaining useful life of the primary air filter element is predicted by means of a remaining useful life prediction model based on the air flow parameter, the current clogging condition of the primary air filter element and the cumulative usage time T1 and is displayed on the display device.

15. The method of claim 14, wherein, The remaining useful life prediction model is a pre-trained neural network model.

16. The method of claim 10 or 11, wherein, The primary air filter element is additionally decoupled from the intake passage.

17. The method of claim 16, wherein, In the case of a severe clogging of the secondary air filter element, the primary air filter element and the secondary air filter element are simultaneously coupled on the intake passage.

18. The method of claim 8, wherein, The at least one sensor is designed as a differential pressure sensor, wherein the differential pressure sensor is pressure zero-point calibrated at each power-up, and / or the valve device is self-checked at each power-up.

19. A control module for an air filtration arrangement according to any one of claims 1 to 7, the control module comprising an evaluation unit and a communication unit, the control module being signal connected with the at least one sensor, the valve arrangement and a control device of the working machine by means of the communication unit, wherein, The evaluation unit evaluates a clogging condition of the primary air filter element based on the air flow parameter and generates an actuation signal for actuating the valve device depending on the clogging condition.

20. The control module of claim 19, wherein, The control module further comprises a prediction unit which predicts a remaining useful life of the primary air filter element by means of a remaining useful life prediction model based on the air flow parameter, the current clogging condition of the primary air filter element and the cumulative usage time and sends the remaining useful life to the display device via the bus system.

21. The control module of claim 19 or 20, wherein, The control module further comprises a storage unit.

22. A computer-readable storage medium having stored thereon a computer program comprising executable instructions which, when executed by a processor, implement the method according to any one of claims 8 to 18.

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