Method and system for detecting blockage of filter screen of duct type air conditioner

Abstract

The invention discloses a duct type air conditioner filter screen blockage detection method and system, and the method comprises the following steps: obtaining the cumulative operation time of a duct type air conditioner motor in a data storage library, judging whether the cumulative operation time reaches a first preset time or not, if yes, collecting the reference torque current of the duct type air conditioner motor, a reference torque current sampling array of the ducted air machine motor is fully stored, the average value and the standard deviation of the array are calculated, and whether the average value and the standard deviation meet conditions or not is judged; if yes, the operation torque current of the air duct machine motor is collected, the operation torque current sampling array of the air duct machine motor is filled with the operation torque current, the average value and the standard deviation of the array are calculated, whether the average value and the standard deviation meet the conditions or not is judged, and if yes, it is judged that the air duct machine filter screen is blocked. The problem that in the prior art, whether the filter screen is blocked or not is judged by singly comparing the preset operation time or comparing the preset current, and it may be caused that filter screen blockage detection is inaccurate is solved.

Description

Technical Field

[0001] The invention relates to the technical field of duct machine filter blockage detection, and in particular to a duct machine filter blockage detection method and system. Background Art

[0002] Duct air conditioners are a common electrical appliance in daily life, with advantages such as high comfort and small space occupation. In duct air conditioner systems, the indoor unit generally uses a forward centrifugal fan to achieve air circulation. The filter of the duct air conditioner can filter impurities such as dust and foreign particles in the air. As the use time increases, the impurities on the filter continue to increase and accumulate, making the system effect worse, the air quality decreases, odors are generated, and even affects human health.

[0003] In the prior art, by recording the accumulated running time of the fan, when the accumulated running time of the fan reaches the preset time, the user is prompted to replace the filter, and the time accumulation is repeated after the replacement. Alternatively, by detecting the fan motor current, when the fan motor current deviates from the preset current size, the user is prompted to replace the filter. However, due to differences in equipment usage scenarios, such as the construction design of the air duct at the installation site, the quality of the local air, and the actual size of the air flow volume, the service life of the filter and the working condition of the fan motor will be affected. Therefore, judging whether the filter is blocked by simply comparing the preset running time or comparing the preset current size may result in inaccurate filter blockage detection. Summary of the invention

[0004] In view of the above-mentioned defects, the present invention proposes a method and system for detecting filter blockage of a duct air conditioner, aiming to solve the problem in the prior art of judging whether the filter is blocked by simply comparing the preset running time or the preset current size, which may lead to inaccurate filter blockage detection.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A method for detecting clogging of a filter screen of an air duct machine comprises the following steps:

[0007] Step S1: establishing a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor;

[0008] Step S2: Obtain the accumulated running time of the motor of the duct machine in the data storage database;

[0009] Step S3: Determine whether the accumulated running time of the duct motor reaches the first preset time. If not, update the accumulated running time of the duct motor. If yes, collect the reference torque current I of the duct motor. ref, and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. ref The average and standard deviation I refSTD , and judge and I refSTD Does it satisfy the following inequality:

[0010]

[0011] Wherein, C1 represents the first proportional coefficient;

[0012] If the conditions are met, step S4 is executed; if the conditions are not met, the reference torque current of the duct machine motor is continuously collected and the reference torque current sampling array of the duct machine motor is updated;

[0013] Step S4: Collect the running torque current I of the duct motor and store it in the running torque current sampling array of the duct motor. When it is detected that the running torque current sampling array is full, calculate the average value of all the running torque currents I in the running torque current sampling array. and standard deviation I STD , and determine whether the following two inequalities are satisfied at the same time:

[0014]

[0015] Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient;

[0016] If the conditions are met, it is determined that the duct filter is clogged; if not, it is determined that the duct filter is not clogged.

[0017] Preferably, in step S3, when the accumulated running time of the duct motor reaches the first preset time, the reference torque current I of the duct motor is collected. ref , and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. ref The average and standard deviation I refSTD , specifically including the following sub-steps:

[0018] Step S31: Collect the speed of the duct motor and determine whether the speed of the duct motor reaches the preset speed. If not, adjust the speed of the duct motor to reach the preset speed. If yes, collect the reference torque current I of the duct motor. ref ;

[0019] Step S32: Determine whether the reference torque current data in the reference torque current sampling array of the duct motor is full. If not, store the reference torque current I of the duct motor according to the first storage rule. ref The reference torque current sampling array of the duct machine motor is stored in sequence, wherein the first storage rule is as follows:

[0020]

[0021] Where n is the length of the reference torque current sampling array of the duct machine motor, n = 1, 2, 3, ... N; I refn Represents the nth reference torque current in the reference torque current sampling array of the duct machine motor;

[0022] If so, calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor ref The average and standard deviation I refSTD , the specific calculation formula is as follows:

[0023]

[0024]

[0025] Preferably, in step S4, the running torque current I of the duct motor is collected and stored in the running torque current sampling array of the duct motor, and when it is detected that the running torque current sampling array is full, the average value of all the running torque currents I in the running torque current sampling array is calculated. and standard deviation I STD , specifically including the following sub-steps:

[0026] Step S41: collecting the speed of the duct machine motor and determining whether the speed of the duct machine motor reaches a preset speed. If not, adjusting the speed of the duct machine motor to reach the preset speed. If yes, collecting the running torque current I of the duct machine motor.

[0027] Step S32: Determine whether the running torque current data in the running torque current sampling array of the duct motor is full. If not, store the running torque current I of the duct motor in the running torque current sampling array of the duct motor in sequence according to the second storage rule, wherein the second storage rule is as follows:

[0028]

[0029] Where n' is the length of the running torque current sampling array of the duct machine motor, n'=1, 2, 3, ... N'; I n' Represents the n'th running torque current in the running torque current sampling array of the duct machine motor;

[0030] If so, calculate the average value of all running torque currents U in the running torque current sampling array of the duct machine motor and standard deviation I STD , the specific calculation formula is as follows:

[0031]

[0032]

[0033] Preferably, when the duct machine is powered on for the first time or a new filter is replaced, the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor and the running torque current sampling array of the duct machine motor in the data storage library are cleared.

[0034] Another aspect of the present application provides a duct machine filter blockage detection system, the system comprising:

[0035] An establishment module is used to establish a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor;

[0036] An acquisition module, used for acquiring the accumulated running time of the motor of the duct machine in the data storage library;

[0037] A first judgment module is used to judge whether the accumulated running time of the motor of the duct machine reaches a first preset time, if not, execute the first updating module, if yes, execute the first acquisition module, execute the first storage module, and execute the first detection module;

[0038] A first updating module is used to update the accumulated running time of the motor of the duct machine;

[0039] The first acquisition module is used to collect the reference torque current I of the duct machine motor ref ;

[0040] The first storage module is used to store the reference torque current I of the duct machine motor. ref A reference torque current sampling array stored in the duct machine motor;

[0041] A first detection module, configured to execute the first calculation module and the second judgment module when it is detected that the reference torque current sampling array is full;

[0042] The first calculation module is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The average and standard deviation I refSTD ;

[0043] The second judgment module is used to judge and I refSTD Does it satisfy the following inequality:

[0044]

[0045] Wherein, C1 represents the first proportional coefficient;

[0046] If the conditions are met, the second acquisition module is executed, the second storage module is executed, and the second detection module is executed. If the conditions are not met, the first acquisition module is continued to be executed, and the second update module is executed.

[0047] The second updating module is used to update the reference torque current sampling array of the duct machine motor;

[0048] The second acquisition module is used to collect the running torque current I of the motor of the duct machine;

[0049] A second storage module is used to store the operating torque current I of the duct machine motor in the operating torque current sampling array of the duct machine motor;

[0050] A second detection module, configured to execute the second calculation module and the third judgment module when it is detected that the running torque current sampling array is full;

[0051] The second calculation module is used to calculate the average value of all running torque currents I in the running torque current sampling array and standard deviation I STD ;

[0052] The third judgment module is used to judge whether the following two inequalities are satisfied at the same time:

[0053]

[0054] Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient;

[0055] If the conditions are met, it is determined that the duct filter is clogged; if not, it is determined that the duct filter is not clogged.

[0056] Preferably, the first judgment module includes:

[0057] The first acquisition submodule is used to acquire the rotation speed of the motor of the duct machine;

[0058] The first judgment submodule is used to judge whether the speed of the motor of the duct machine reaches the preset speed. If not, the adjustment submodule is executed. If yes, the second collection submodule is executed.

[0059] The regulating submodule is used to adjust the speed of the duct fan motor to reach a preset speed;

[0060] The second acquisition submodule is used to collect the reference torque current I of the duct machine motor. ref ;

[0061] The second judgment submodule is used to judge whether the reference torque current data in the reference torque current sampling array of the duct machine motor is fully stored, if not, the first storage submodule is executed, if yes, the first calculation submodule and the second calculation submodule are executed;

[0062] The first storage submodule is used to store the reference torque current I of the duct machine motor according to the first storage rule. ref The reference torque current sampling array of the duct machine motor is stored in sequence, wherein the first storage rule is as follows:

[0063]

[0064] Where n is the length of the reference torque current sampling array of the duct machine motor, n = 1, 2, 3, ... N; I refn Represents the nth reference torque current in the reference torque current sampling array of the duct machine motor;

[0065] The first calculation submodule is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The average The specific calculation formula is as follows:

[0066]

[0067] The second calculation submodule is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The standard deviation of refSTD , the specific calculation formula is as follows:

[0068]

[0069] Preferably, the second judgment module includes:

[0070] The first acquisition submodule is used to acquire the rotation speed of the motor of the duct machine;

[0071] The third judgment submodule is used to judge whether the speed of the motor of the duct machine reaches the preset speed. If not, the adjustment submodule is executed. If yes, the third collection submodule is executed.

[0072] The regulating submodule is used to adjust the speed of the duct fan motor to reach a preset speed;

[0073] The third acquisition submodule is used to collect the running torque current I of the motor of the duct machine;

[0074] The fourth judgment submodule is used to judge whether the running torque current data in the running torque current sampling array of the duct machine motor is full, if not, the second storage submodule is executed, and if so, the third calculation submodule and the fourth calculation submodule are executed;

[0075] The second storage submodule is used to store the running torque current I of the duct machine motor in the running torque current sampling array of the duct machine motor in sequence according to the second storage rule, wherein the second storage rule is as follows:

[0076]

[0077] Where n' is the length of the running torque current sampling array of the duct machine motor, n'=1, 2, 3, ... N'; I n' Represents the n'th running torque current in the running torque current sampling array of the duct machine motor;

[0078] The third calculation submodule is used to calculate the average value of all running torque currents I in the running torque current sampling array of the duct machine motor The specific calculation formula is as follows:

[0079]

[0080] The fourth calculation submodule is used to calculate the standard deviation I of all running torque currents I in the running torque current sampling array of the duct machine motor STD , the specific calculation formula is as follows:

[0081]

[0082] Preferably, it also includes a data clearing processing module, which is used to clear the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor and the running torque current sampling array of the duct machine motor in the data storage library when the duct machine is powered on for the first time or a new filter is replaced.

[0083] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0084] In this scheme, whether the duct machine filter is blocked is detected through three dimensions: the accumulated running time of the duct machine motor, the reference torque current of the duct machine motor and the running torque current of the duct machine motor. Compared with judging whether the filter is blocked by simply comparing the preset running time or the preset current size, this multi-dimensional detection method can better adapt to complex and changeable working conditions, thereby improving the accuracy and comprehensiveness of filter blockage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1 The invention discloses a flow chart of steps for detecting clogging of a filter screen of an air duct machine. DETAILED DESCRIPTION

[0086] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0087] A method for detecting clogging of a filter screen of an air duct machine comprises the following steps:

[0088] Step S1: establishing a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor;

[0089] Step S2: Obtain the accumulated running time of the motor of the duct machine in the data storage database;

[0090] Step S3: Determine whether the accumulated running time of the duct motor reaches the first preset time. If not, update the accumulated running time of the duct motor. If yes, collect the reference torque current I of the duct motor. ref , and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. ref The average and standard deviation I refSTD , and judge and I refSTD Does it satisfy the following inequality:

[0091]

[0092] Wherein, C1 represents the first proportional coefficient;

[0093] If the conditions are met, step S4 is executed; if the conditions are not met, the reference torque current of the duct machine motor is continuously collected and the reference torque current sampling array of the duct machine motor is updated;

[0094] Step S4: Collect the running torque current I of the duct motor and store it in the running torque current sampling array of the duct motor. When it is detected that the running torque current sampling array is full, calculate the average value of all the running torque currents I in the running torque current sampling array. and standard deviation I STD, and determine whether the following two inequalities are satisfied at the same time:

[0095]

[0096] Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient;

[0097] If the conditions are met, it is determined that the duct filter is clogged; if not, it is determined that the duct filter is not clogged.

[0098] A method for detecting clogging of a duct filter in this scheme is as follows: Figure 1 As shown, the first step is to establish a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor; in this embodiment, by establishing a data storage library, it is beneficial to store and manage the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor. The second step is to obtain the accumulated running time of the duct machine motor in the data storage library. In this embodiment, when the duct machine is powered on, the accumulated running time of the duct machine motor in the data storage library can be read as the current running time of the duct machine motor, which is beneficial for subsequent comparison with the first preset time. The third step is to determine whether the accumulated running time of the duct machine motor has reached the first preset time. If not, the accumulated running time of the duct machine motor is updated. If so, the reference torque current I of the duct machine motor is collected. ref , and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. re The average value of f and standard deviation I refSTD , and judge and I refSTD Does it satisfy the following inequality: Wherein, C1 represents the first proportional coefficient; if it is satisfied, then execute step S4; if it is not satisfied, then continue to collect the reference torque current of the duct machine motor and update the reference torque current sampling array of the duct machine motor. In this embodiment, the first preset time is 24 hours. When the current operation time of the duct machine motor does not reach 24 hours, it means that the current duct machine system is in an unstable state, and there may be unclear factors such as air duct adjustment. Therefore, the current sampling is not performed during the period before 24 hours, and the air duct adjustment time generally does not exceed 24 hours. When the current operation time of the duct machine motor reaches 24 hours, it means that the current duct machine system is in a stable state, and the system can perform a sampling stage, that is, collect the reference torque current I of the duct machine motor. ref , and the reference torque current Iref Store the full reference torque current sampling array. During the acquisition phase, the system will perform a reference torque current sampling every time the motor starts. When the reference torque current sampling array is full, calculate the average value of all reference torque current data. and standard deviation I refSTD , and judge and I refSTD Is it satisfied? This inequality, in this embodiment, C1 is 10%. The smaller the value of C1, the more concentrated the reference torque current data sampled is required to be, and the more stable the system working condition is, and vice versa. If it is satisfied, it means that the reference torque current data collected is relatively concentrated, the system working condition is relatively stable, and the system can proceed to the next detection stage and calculate the average value of all reference torque current data. Stored in the data storage library, this value is used as the reference torque current benchmark to determine whether the duct machine filter is blocked during the detection phase. If it is not satisfied, it means that the reference torque current data collected fluctuates greatly and the system operating condition is not stable enough. The system ensures that the reference torque current sampling and reference torque current sampling array update will continue during the sampling phase and at the next motor start. The fourth step is to collect the operating torque current I of the duct machine motor and store it in the operating torque current sampling array of the duct machine motor. When it is detected that the operating torque current sampling array is full, the average value of all the operating torque currents I in the operating torque current sampling array is calculated. and standard deviation I STD , and determine whether the following two inequalities are satisfied at the same time: Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient; if satisfied, it is determined that the duct machine filter is blocked; if not satisfied, it is determined that the duct machine filter is not blocked. In this embodiment, in the detection stage, each time the system starts the motor, an operating torque current sampling is performed. When the collected operating torque current I fills the operating torque current sampling array of the duct machine motor, the average value of all operating torque currents I is calculated. and standard deviation I STD , and judge and I STD Whether to satisfy both and Two inequalities. In this embodiment, C2 is 10%. The smaller the value of C2, the more concentrated the sampled operating torque current data is, and the more stable the system operating condition is, and vice versa. C3 is 50%. C3 reflects the degree to which the current operating torque current deviates from the average value of the reference torque current calculated in the sampling stage. The smaller the value of C3, the lower the degree of blockage for judging the filter blockage to take effect, and vice versa. When the above two inequalities are met at the same time, it is judged that the duct air filter is blocked, and an alarm signal is issued to remind the user to replace the filter in time.

[0099] In this scheme, whether the duct machine filter is blocked is detected through three dimensions: the accumulated running time of the duct machine motor, the reference torque current of the duct machine motor and the running torque current of the duct machine motor. Compared with judging whether the filter is blocked by simply comparing the preset running time or the preset current size, this multi-dimensional detection method can better adapt to complex and changeable working conditions, thereby improving the accuracy and comprehensiveness of filter blockage detection.

[0100] Preferably, in step S3, when the accumulated running time of the duct motor reaches the first preset time, the reference torque current I of the duct motor is collected. ref , and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. ref The average and standard deviation I refSTD , specifically including the following sub-steps:

[0101] Step S31: Collect the speed of the duct motor and determine whether the speed of the duct motor reaches the preset speed. If not, adjust the speed of the duct motor to reach the preset speed. If yes, collect the reference torque current I of the duct motor. ref ;

[0102] Step S32: Determine whether the reference torque current data in the reference torque current sampling array of the duct motor is full. If not, store the reference torque current I of the duct motor according to the first storage rule. ref The reference torque current sampling array of the duct machine motor is stored in sequence, wherein the first storage rule is as follows:

[0103]

[0104] Where n is the length of the reference torque current sampling array of the duct machine motor, n = 1, 2, 3, ... N; I refn Represents the nth reference torque current in the reference torque current sampling array of the duct machine motor;

[0105] If so, calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor ref The average and standard deviation I refSTD , the specific calculation formula is as follows:

[0106]

[0107]

[0108] In this embodiment, when the reference torque current sampling array of the duct machine motor can store 20 reference torque current data, N is 20. The preset speed is 1000rpm. By collecting the speed of the duct machine motor and adjusting it to 1000rpm, the duct machine system reaches a stable state, and then starts to collect the reference torque current I of the duct machine motor. ref , and the reference torque current I of the duct machine motor is collected ref Store the reference torque current sampling array with a full length of 20 in sequence, and calculate 20 reference torque currents I ref The average and standard deviation I refSTD , which is convenient for subsequent judgment on whether the duct machine system has entered the detection stage.

[0109] To further illustrate, when the reference torque current sampling array of the duct machine motor is full and data needs to be updated, the earliest stored data can be deleted and the latest collected data can be stored.

[0110] Preferably, in step S4, the running torque current I of the duct motor is collected and stored in the running torque current sampling array of the duct motor, and when it is detected that the running torque current sampling array is full, the average value I and standard deviation I of all the running torque currents I in the running torque current sampling array are calculated. STD , specifically including the following sub-steps:

[0111] Step S41: collecting the speed of the duct machine motor and determining whether the speed of the duct machine motor reaches a preset speed. If not, adjusting the speed of the duct machine motor to reach the preset speed. If yes, collecting the running torque current I of the duct machine motor.

[0112] Step S32: Determine whether the running torque current data in the running torque current sampling array of the duct motor is full. If not, store the running torque current I of the duct motor in the running torque current sampling array of the duct motor in sequence according to the second storage rule, wherein the second storage rule is as follows:

[0113]

[0114] Where n' is the length of the running torque current sampling array of the duct machine motor, n'=1, 2, 3, ... N'; I n′ Represents the n′th running torque current in the running torque current sampling array of the duct machine motor;

[0115] If so, calculate the average value I and standard deviation I of all running torque currents I in the running torque current sampling array of the duct machine motor STD , the specific calculation formula is as follows:

[0116]

[0117]

[0118] In this embodiment, when the running torque current sampling array of the duct machine motor can store 20 running torque current data, N' is 20. The preset speed is 1000rpm. By collecting the speed of the duct machine motor and adjusting it to 1000rpm, the duct machine system reaches a stable state, and then starts to collect the running torque current I of the duct machine motor, and the collected running torque current I of the duct machine motor is sequentially stored in the running torque current sampling array with a length of 20, and the average value of the 20 running torque currents I is calculated. and standard deviation I STD , which is convenient for subsequent filter blockage detection.

[0119] To further illustrate, when the running torque current sampling array of the duct machine motor is full and data needs to be updated, the earliest stored data can be deleted and the latest collected data can be stored.

[0120] Preferably, the following steps are also included: when the duct machine is powered on for the first time or a new filter is replaced, the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor and the running torque current sampling array of the duct machine motor in the data storage library are cleared.

[0121] In this embodiment, after the duct machine is powered on for the first time or the filter is replaced, its internal state has been restored to a relatively initial state. At this time, clearing the accumulated running time can ensure that the actual running time of the duct machine is accurately recorded again from this moment on, providing a reliable basis for subsequent performance evaluation, maintenance plan formulation, etc. The reference torque current sampling array and the operating torque current sampling array record the current data of the duct machine under different working conditions. These data are of great significance for analyzing the operating status of the duct machine and optimizing the control strategy. Clearing these arrays when replacing a new filter or powering on for the first time can eliminate the interference of historical data and ensure that the data collected subsequently is more accurate and reliable.

[0122] Another aspect of the present application provides a duct machine filter blockage detection system, the system comprising:

[0123] An establishment module is used to establish a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor;

[0124] An acquisition module, used for acquiring the accumulated running time of the motor of the duct machine in the data storage library;

[0125] A first judgment module is used to judge whether the accumulated running time of the motor of the duct machine reaches a first preset time, if not, execute the first updating module, if yes, execute the first acquisition module, execute the first storage module, and execute the first detection module;

[0126] A first updating module is used to update the accumulated running time of the motor of the duct machine;

[0127] The first acquisition module is used to collect the reference torque current I of the duct machine motor ref ;

[0128] The first storage module is used to store the reference torque current I of the duct machine motor. ref A reference torque current sampling array stored in the duct machine motor;

[0129] A first detection module, configured to execute the first calculation module and the second judgment module when it is detected that the reference torque current sampling array is full;

[0130] The first calculation module is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The average and standard deviation I refSTD ;

[0131] The second judgment module is used to judge and I refSTD Does it satisfy the following inequality:

[0132]

[0133] Wherein, C1 represents the first proportional coefficient;

[0134] If the conditions are met, the second acquisition module is executed, the second storage module is executed, and the second detection module is executed. If the conditions are not met, the first acquisition module is continued to be executed, and the second update module is executed.

[0135] The second updating module is used to update the reference torque current sampling array of the duct machine motor;

[0136] The second acquisition module is used to collect the running torque current I of the motor of the duct machine;

[0137] A second storage module is used to store the operating torque current I of the duct machine motor in the operating torque current sampling array of the duct machine motor;

[0138] A second detection module, configured to execute the second calculation module and the third judgment module when it is detected that the running torque current sampling array is full;

[0139] The second calculation module is used to calculate the average value of all running torque currents I in the running torque current sampling array and standard deviation I STD ;

[0140] The third judgment module is used to judge whether the following two inequalities are satisfied at the same time:

[0141]

[0142] Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient;

[0143] If the conditions are met, it is determined that the duct filter is clogged; if not, it is determined that the duct filter is not clogged.

[0144] The present solution is a duct machine filter blockage detection system, which realizes the detection of duct machine filter blockage through the cooperation of the establishment module, the acquisition module, the first judgment module, the first update module, the first acquisition module, the first storage module, the first detection module, the first calculation module, the second judgment module, the second update module, the second acquisition module, the second storage module, the second detection module, the second calculation module and the third judgment module. In the present solution, the duct machine filter is detected to be blocked through the three dimensions of the accumulated running time of the duct machine motor, the reference torque current of the duct machine motor and the running torque current of the duct machine motor. Compared with judging whether the filter is blocked by comparing the preset running time or the preset current size alone, this multi-dimensional detection method can better adapt to complex and changeable working conditions, thereby improving the accuracy and comprehensiveness of filter blockage detection.

[0145] Preferably, the first judgment module includes:

[0146] The first acquisition submodule is used to acquire the rotation speed of the motor of the duct machine;

[0147] The first judgment submodule is used to judge whether the speed of the motor of the duct machine reaches the preset speed. If not, the adjustment submodule is executed. If yes, the second collection submodule is executed.

[0148] The regulating submodule is used to adjust the speed of the duct fan motor to reach a preset speed;

[0149] The second acquisition submodule is used to collect the reference torque current I of the duct machine motor. ref ;

[0150] The second judgment submodule is used to judge whether the reference torque current data in the reference torque current sampling array of the duct machine motor is fully stored, if not, the first storage submodule is executed, if yes, the first calculation submodule and the second calculation submodule are executed;

[0151] The first storage submodule is used to store the reference torque current I of the duct machine motor according to the first storage rule. ref The reference torque current sampling array of the duct machine motor is stored in sequence, wherein the first storage rule is as follows:

[0152]

[0153] Where n is the length of the reference torque current sampling array of the duct machine motor, n = 1, 2, 3, ... N; I refn Represents the nth reference torque current in the reference torque current sampling array of the duct machine motor;

[0154] The first calculation submodule is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The average The specific calculation formula is as follows:

[0155]

[0156] The second calculation submodule is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The standard deviation of refSTD , the specific calculation formula is as follows:

[0157]

[0158] In this embodiment, in the first judgment module, when the cumulative running time of the duct motor reaches the first preset time, the first acquisition submodule, the first judgment submodule, the adjustment submodule, the second acquisition submodule, the second judgment submodule, the first storage submodule, the first calculation submodule and the second calculation submodule cooperate with each other to realize the reference torque current I in the reference torque current sampling array of the duct motor. ref The average and standard deviation I refSTD The calculation is convenient for subsequent judgment on whether the duct machine system has entered the detection stage.

[0159] Preferably, the second judgment module includes:

[0160] The first acquisition submodule is used to acquire the rotation speed of the motor of the duct machine;

[0161] The third judgment submodule is used to judge whether the speed of the motor of the duct machine reaches the preset speed. If not, the adjustment submodule is executed. If yes, the third collection submodule is executed.

[0162] The regulating submodule is used to adjust the speed of the duct fan motor to reach a preset speed;

[0163] The third acquisition submodule is used to collect the running torque current I of the motor of the duct machine;

[0164] The fourth judgment submodule is used to judge whether the running torque current data in the running torque current sampling array of the duct machine motor is full, if not, the second storage submodule is executed, and if so, the third calculation submodule and the fourth calculation submodule are executed;

[0165] The second storage submodule is used to store the running torque current I of the duct machine motor in the running torque current sampling array of the duct machine motor in sequence according to the second storage rule, wherein the second storage rule is as follows:

[0166]

[0167] Where n' is the length of the running torque current sampling array of the duct machine motor, n'=1, 2, 3, ... N'; I n′ Represents the n′th running torque current in the running torque current sampling array of the duct machine motor;

[0168] The third calculation submodule is used to calculate the average value of all running torque currents I in the running torque current sampling array of the duct machine motor The specific calculation formula is as follows:

[0169]

[0170] The fourth calculation submodule is used to calculate the standard deviation I of all running torque currents I in the running torque current sampling array of the duct machine motor STD , the specific calculation formula is as follows:

[0171]

[0172] In this embodiment, in the second judgment module, when and I refSTD The following inequality is satisfied: When the first acquisition submodule, the third judgment submodule, the adjustment submodule, the third acquisition submodule, the fourth judgment submodule, the second storage submodule, the third calculation submodule and the fourth calculation submodule cooperate with each other to realize the average value of all the running torque currents I in the running torque current sampling array of the duct machine motor. and standard deviation I STD , which is convenient for subsequent filter blockage detection.

[0173] Preferably, it also includes a data clearing processing module, which is used to clear the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor and the running torque current sampling array of the duct machine motor in the data storage library when the duct machine is powered on for the first time or a new filter is replaced.

[0174] In this embodiment, after the duct machine is powered on for the first time or the filter is replaced, its internal state has been restored to a relatively initial state. At this time, clearing the accumulated running time can ensure that the actual running time of the duct machine is accurately recorded again from this moment on, providing a reliable basis for subsequent performance evaluation, maintenance plan formulation, etc. The reference torque current sampling array and the operating torque current sampling array record the current data of the duct machine under different working conditions. These data are of great significance for analyzing the operating status of the duct machine and optimizing the control strategy. Clearing these arrays when replacing a new filter or powering on for the first time can eliminate the interference of historical data and ensure that the data collected subsequently is more accurate and reliable.

[0175] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0176] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for detecting clogging of a duct filter, characterized in that: The following steps are involved: Step S1: establishing a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor; Step S2: Obtain the accumulated running time of the motor of the duct machine in the data storage database; Step S3: Determine whether the accumulated running time of the duct motor reaches the first preset time. If not, update the accumulated running time of the duct motor. If yes, collect the reference torque current I of the duct motor. ref , and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. ref The average and standard deviation I refSTD , and judge and I refSTD Does it satisfy the following inequality: Wherein, C1 represents the first proportional coefficient; If the conditions are met, step S4 is executed; if the conditions are not met, the reference torque current of the duct machine motor is continuously collected and the reference torque current sampling array of the duct machine motor is updated; Step S4: Collect the running torque current I of the duct motor and store it in the running torque current sampling array of the duct motor. When it is detected that the running torque current sampling array is full, calculate the average value of all the running torque currents I in the running torque current sampling array. and standard deviation I STD , and determine whether the following two inequalities are satisfied at the same time: Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient; If the conditions are met, it is determined that the duct filter is clogged; if not, it is determined that the duct filter is not clogged.

2. A method for detecting clogging of a filter screen of an air duct machine according to claim 1, characterized in that: In step S3, when the accumulated running time of the duct motor reaches the first preset time, the reference torque current I of the duct motor is collected. ref , and store it in the reference torque current sampling array of the duct machine motor, and when it is detected that the reference torque current sampling array is full, all reference torque currents I in the reference torque current sampling array of the duct machine motor are calculated. ref The average and standard deviation I refSTD , specifically including the following sub-steps: Step S31: Collect the speed of the duct motor and determine whether the speed of the duct motor reaches the preset speed. If not, adjust the speed of the duct motor to reach the preset speed. If yes, collect the reference torque current I of the duct motor. ref ; Step S32: Determine whether the reference torque current data in the reference torque current sampling array of the duct motor is full. If not, store the reference torque current I of the duct motor according to the first storage rule. ref The reference torque current sampling array of the duct machine motor is stored in sequence, wherein the first storage rule is as follows: Where n is the length of the reference torque current sampling array of the duct machine motor, n = 1, 2, 3, ... N; I refn Represents the nth reference torque current in the reference torque current sampling array of the duct machine motor; If so, calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor ref The average and standard deviation I refSTD , the specific calculation formula is as follows:

3. A method for detecting clogging of a duct filter according to claim 2, characterized in that: In step S4, the running torque current I of the duct motor is collected and stored in the running torque current sampling array of the duct motor. When it is detected that the running torque current sampling array is full, the average value of all the running torque currents I in the running torque current sampling array is calculated. and standard deviation I STD , specifically including the following sub-steps: Step S41: collecting the speed of the duct machine motor and determining whether the speed of the duct machine motor reaches a preset speed. If not, adjusting the speed of the duct machine motor to reach the preset speed. If yes, collecting the running torque current I of the duct machine motor. Step S32: Determine whether the running torque current data in the running torque current sampling array of the duct motor is full. If not, store the running torque current I of the duct motor in the running torque current sampling array of the duct motor in sequence according to the second storage rule, wherein the second storage rule is as follows: Where n' is the length of the running torque current sampling array of the duct machine motor, n'=1, 2, 3, ... N'; I n' Represents the n'th running torque current in the running torque current sampling array of the duct machine motor; If so, calculate the average value of all running torque currents I in the running torque current sampling array of the duct machine motor and standard deviation I STD , the specific calculation formula is as follows:

4. A method for detecting clogging of a duct filter according to claim 1, characterized in that: The following steps are also included: When the duct machine is powered on for the first time or a new filter is replaced, the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor and the running torque current sampling array of the duct machine motor in the data storage library are cleared.

5. A duct machine filter blockage detection system, using the duct machine filter blockage detection method according to any one of claims 1 to 4, characterized in that: The system comprises: An establishment module is used to establish a data storage library, wherein the data storage library includes the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor; An acquisition module, used for acquiring the accumulated running time of the motor of the duct machine in the data storage library; A first judgment module is used to judge whether the accumulated running time of the motor of the duct machine reaches a first preset time, if not, execute the first updating module, if yes, execute the first acquisition module, execute the first storage module, and execute the first detection module; A first updating module is used to update the accumulated running time of the motor of the duct machine; The first acquisition module is used to collect the reference torque current I of the duct machine motor ref ; The first storage module is used to store the reference torque current I of the duct machine motor. ref A reference torque current sampling array stored in the duct machine motor; A first detection module, configured to execute the first calculation module and the second judgment module when it is detected that the reference torque current sampling array is full; The first calculation module is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The average and standard deviation I refSTD ; The second judgment module is used to judge and I refSTD Does it satisfy the following inequality: Wherein, C1 represents the first proportional coefficient; If the conditions are met, the second acquisition module is executed, the second storage module is executed, and the second detection module is executed. If the conditions are not met, the first acquisition module is continued to be executed, and the second update module is executed. The second updating module is used to update the reference torque current sampling array of the duct machine motor; The second acquisition module is used to collect the running torque current I of the motor of the duct machine; A second storage module is used to store the operating torque current I of the duct machine motor in the operating torque current sampling array of the duct machine motor; A second detection module, configured to execute the second calculation module and the third judgment module when it is detected that the running torque current sampling array is full; The second calculation module is used to calculate the average value of all running torque currents I in the running torque current sampling array and standard deviation I STD ; The third judgment module is used to judge whether the following two inequalities are satisfied at the same time: Wherein, C2 represents the second proportional coefficient; C3 represents the third proportional coefficient; If the conditions are met, it is determined that the duct filter is clogged; if not, it is determined that the duct filter is not clogged.

6. The duct filter blockage detection system according to claim 5, characterized in that: The first judgment module includes: The first acquisition submodule is used to acquire the rotation speed of the motor of the duct machine; The first judgment submodule is used to judge whether the speed of the motor of the duct machine reaches the preset speed. If not, the adjustment submodule is executed. If yes, the second collection submodule is executed. The regulating submodule is used to adjust the speed of the duct fan motor to reach a preset speed; The second acquisition submodule is used to collect the reference torque current I of the duct machine motor. ref ; The second judgment submodule is used to judge whether the reference torque current data in the reference torque current sampling array of the duct machine motor is fully stored, if not, the first storage submodule is executed, if yes, the first calculation submodule and the second calculation submodule are executed; The first storage submodule is used to store the reference torque current I of the duct machine motor according to the first storage rule. ref The reference torque current sampling array of the duct machine motor is stored in sequence, wherein the first storage rule is as follows: Where n is the length of the reference torque current sampling array of the duct machine motor, n = 1, 2, 3, ... N; I refn Represents the nth reference torque current in the reference torque current sampling array of the duct machine motor; The first calculation submodule is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The average The specific calculation formula is as follows: The second calculation submodule is used to calculate all reference torque currents I in the reference torque current sampling array of the duct machine motor. ref The standard deviation of refSTD , the specific calculation formula is as follows:

7. The duct filter blockage detection system according to claim 6, characterized in that: The second judgment module includes: The first acquisition submodule is used to acquire the rotation speed of the motor of the duct machine; The third judgment submodule is used to judge whether the speed of the motor of the duct machine reaches the preset speed. If not, the adjustment submodule is executed. If yes, the third collection submodule is executed. The regulating submodule is used to adjust the speed of the duct fan motor to reach a preset speed; The third acquisition submodule is used to collect the running torque current I of the motor of the duct machine; The fourth judgment submodule is used to judge whether the running torque current data in the running torque current sampling array of the duct machine motor is full, if not, the second storage submodule is executed, and if so, the third calculation submodule and the fourth calculation submodule are executed; The second storage submodule is used to store the running torque current I of the duct machine motor in the running torque current sampling array of the duct machine motor in sequence according to the second storage rule, wherein the second storage rule is as follows: Where n' is the length of the running torque current sampling array of the duct machine motor, n'=1, 2, 3, ... N'; I n' Represents the n'th running torque current in the running torque current sampling array of the duct machine motor; The third calculation submodule is used to calculate the average value of all running torque currents I in the running torque current sampling array of the duct machine motor The specific calculation formula is as follows: The fourth calculation submodule is used to calculate the standard deviation I of all running torque currents I in the running torque current sampling array of the duct machine motor STD , the specific calculation formula is as follows:

8. The duct filter blockage detection system according to claim 5, characterized in that: It also includes a data clearing processing module, which is used to clear the accumulated running time of the duct machine motor, the reference torque current sampling array of the duct machine motor, and the running torque current sampling array of the duct machine motor in the data storage library when the duct machine is powered on for the first time or a new filter has been replaced.

Images