Air conditioning system, control method and device thereof, storage medium and program product

Abstract

The invention discloses an air conditioning system and a control method and device thereof, a storage medium and a computer program product, and the method comprises the following steps: under the condition that the air conditioning system runs after being started, determining a reference value of an electrical parameter of a compressor according to the electrical parameter of the compressor; according to the reference value of the electrical parameter of the compressor, the current value of the electrical parameter of the compressor and the output parameter of the corresponding sensor in the sensor assembly, whether the corresponding sensor in the sensor assembly fails or not is determined; if it is determined that the corresponding sensor in the sensor assembly loses efficacy, a prompt message that the corresponding sensor in the sensor assembly loses efficacy is initiated; and / or, according to the current value of the electrical parameter of the compressor, the protection threshold value of the output parameter of the corresponding sensor in the sensor assembly is adjusted. According to the scheme, the electric parameters of the compressor in the air conditioning system are used for representing the load state of the air conditioning system, control and protection under the sensor failure condition are achieved according to the electric parameters of the compressor, and the operation stability and safety of the air conditioning system are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioning systems, and particularly relates to an air conditioning system control method and device, an air conditioning system, a storage medium, and a computer program product, and more particularly to an intelligent control method and device for an air conditioning system under sensor failure, an air conditioning system, a storage medium, and a computer program product. BACKGROUND

[0002] Air conditioning systems (such as household air conditioning systems) generally rely on temperature, pressure, and other sensors to monitor the operating state and control and protect accordingly. However, in the event of a sensor failure or malfunction of the air conditioning system, the air conditioning system often cannot accurately determine the operating state and cannot control and protect normally according to the operating device of the air conditioning system.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent an acknowledgement that the above content is prior art. SUMMARY

[0004] The purpose of the present application is to provide an air conditioning system control method and device, an air conditioning system, a storage medium, and a computer program product to solve the problem that the air conditioning system often cannot accurately determine the operating state and cannot control and protect normally according to the operating device of the air conditioning system in the event of a sensor failure or malfunction of the air conditioning system, affecting the operating stability and safety of the air conditioning system, and to achieve the effect of characterizing the load state of the air conditioning system by the compressor electrical parameters in the air conditioning system, and realizing control and protection under sensor (such as temperature, pressure, and other sensors) failure according to the compressor electrical parameters, ensuring the operating stability and safety of the air conditioning system.

[0005] The present application provides an air conditioning system control method, the air conditioning system having a compressor and a sensor assembly; the air conditioning system control method comprising: in the case of running after starting the air conditioning system, obtaining the electrical parameters of the compressor and the output parameters of the corresponding sensor in the sensor assembly; determining the reference value of the electrical parameters of the compressor according to the electrical parameters of the compressor; determining whether the corresponding sensor in the sensor assembly is failed according to the reference value of the electrical parameters of the compressor, the current value of the electrical parameters of the compressor, and the output parameters of the corresponding sensor in the sensor assembly; if it is determined that the corresponding sensor in the sensor assembly is failed, initiating a prompt message for the failure of the corresponding sensor in the sensor assembly; and / or adjusting the protection threshold of the output parameters of the corresponding sensor in the sensor assembly according to the current value of the electrical parameters of the compressor to realize control and protection of the air conditioning system.

[0006] In some embodiments, the electrical parameter of the compressor comprises at least one of: a DC bus voltage of the compressor, a three-phase current of the compressor; and / or, the sensor assembly comprises at least one of: a temperature sensor, a pressure sensor; the electrical parameter of the compressor is obtained by: obtaining a sample value of the electrical parameter of the compressor, and taking an average value of the sample values of the electrical parameter of the compressor obtained within a set time window as the obtained electrical parameter of the compressor.

[0007] In some embodiments, the reference value of the electrical parameter of the compressor is determined according to the electrical parameter of the compressor by: taking the electrical parameter of the compressor obtained at a rated frequency of the compressor as an initial reference value of the electrical parameter of the compressor; correcting the initial reference value of the electrical parameter of the compressor according to a target frequency of the compressor to obtain a corrected reference value of the electrical parameter of the compressor; and taking the corrected reference value of the electrical parameter of the compressor as the reference value of the electrical parameter of the compressor.

[0008] In some embodiments, the corrected reference value of the electrical parameter of the compressor is obtained by correcting the initial reference value of the electrical parameter of the compressor according to the target frequency of the compressor, comprising: determining a difference value between the target frequency of the compressor and the rated frequency of the compressor, multiplying the difference value by a set correction coefficient, and taking a sum value of the product value and the initial reference value of the electrical parameter of the compressor as the corrected reference value of the electrical parameter of the compressor.

[0009] In some embodiments, whether the corresponding sensor of the sensor assembly is failed is determined according to the reference value of the electrical parameter of the compressor, a current value of the electrical parameter of the compressor, and an output parameter of the corresponding sensor of the sensor assembly, comprising: taking the electrical parameter of the compressor obtained after the air conditioning system runs for a set time as the current value of the electrical parameter of the compressor; determining a deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor by taking an absolute value of a difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor, and taking a ratio of the reference value of the electrical parameter of the compressor as the deviation degree of the electrical parameter of the compressor; determining a change value of the output parameter of the corresponding sensor of the sensor assembly within a set time as a parameter change value of the corresponding sensor of the sensor assembly; and determining that the corresponding sensor of the sensor assembly is failed if the parameter change value of the corresponding sensor of the sensor assembly is less than a preset change value threshold of the corresponding sensor of the sensor assembly when it is determined that the deviation degree of the electrical parameter of the compressor is greater than a minimum value of a preset deviation degree range.

[0010] In some embodiments, a preset deviation degree range is provided, including: a range formed by a minimum value of the preset deviation degree range, a first deviation degree, a second deviation degree, and a maximum value of the preset deviation degree range in order of increasing; and adjusting the protection threshold of the output parameter of the corresponding sensor in the sensor assembly according to the current value of the electrical parameter of the compressor to achieve control and protection of the air conditioning system, including: determining the deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor as the ratio of the absolute value of the difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor to the reference value of the electrical parameter of the compressor, denoted as the deviation degree of the electrical parameter of the compressor; determining the size relationship between the deviation degree of the electrical parameter of the compressor and the minimum value of the preset deviation degree range, the first deviation degree, the second deviation degree, and the maximum value of the preset deviation degree range; if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the minimum value of the preset deviation degree range and less than or equal to the first deviation degree, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a first preset proportion; if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the first deviation degree and less than or equal to the second deviation degree, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a second preset proportion, the second preset proportion being greater than the first preset proportion; and if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the second deviation degree and less than or equal to the maximum value of the preset deviation degree range, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a third preset proportion, the third preset proportion being greater than the second preset proportion.

[0011] To match the above method, the application further provides a control device of an air conditioning system, the air conditioning system having a compressor and a sensor assembly; the control device of the air conditioning system comprising: an acquisition unit configured to acquire the electrical parameter of the compressor and the output parameter of the corresponding sensor in the sensor assembly in the case that the air conditioning system is running; a control unit configured to determine the reference value of the electrical parameter of the compressor according to the electrical parameter of the compressor; the control unit is further configured to determine whether the corresponding sensor in the sensor assembly is failed according to the reference value of the electrical parameter of the compressor, the current value of the electrical parameter of the compressor, and the output parameter of the corresponding sensor in the sensor assembly; the control unit is further configured to initiate a prompt message of the failure of the corresponding sensor in the sensor assembly if it is determined that the corresponding sensor in the sensor assembly is failed; and / or adjust the protection threshold of the output parameter of the corresponding sensor in the sensor assembly according to the current value of the electrical parameter of the compressor to achieve control and protection of the air conditioning system.

[0012] In some embodiments, the electrical parameter of the compressor comprises at least one of: a DC bus voltage of the compressor, a three-phase current of the compressor; and / or, the sensor assembly comprises at least one of: a temperature sensor, a pressure sensor; the obtaining unit obtains the electrical parameter of the compressor by: obtaining a sampling value of the electrical parameter of the compressor, and taking an average value of the sampling value of the electrical parameter of the compressor obtained within a set time window as the obtained electrical parameter of the compressor.

[0013] In some embodiments, the control unit determines the reference value of the electrical parameter of the compressor according to the electrical parameter of the compressor by: taking the electrical parameter of the compressor obtained at the rated frequency of the compressor as an initial reference value of the electrical parameter of the compressor; correcting the initial reference value of the electrical parameter of the compressor according to the target frequency of the compressor to obtain a corrected reference value of the electrical parameter of the compressor; and determining the corrected reference value of the electrical parameter of the compressor as the reference value of the electrical parameter of the compressor.

[0014] In some embodiments, the control unit corrects the initial reference value of the electrical parameter of the compressor according to the target frequency of the compressor to obtain a corrected reference value of the electrical parameter of the compressor by: determining a difference value between the target frequency of the compressor and the rated frequency of the compressor, multiplying the difference value by a set correction coefficient, and adding the product value to the initial reference value of the electrical parameter of the compressor to obtain the corrected reference value of the electrical parameter of the compressor.

[0015] In some embodiments, the control unit determines whether the corresponding sensor of the sensor assembly is failed according to the reference value of the electrical parameter of the compressor, the current value of the electrical parameter of the compressor, and the output parameter of the corresponding sensor of the sensor assembly by: taking the electrical parameter of the compressor obtained after the air conditioning system runs for a set time as the current value of the electrical parameter of the compressor; determining a deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor by taking an absolute value of a difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor, and dividing the reference value of the electrical parameter of the compressor by the product, and taking the deviation degree as a deviation degree of the electrical parameter of the compressor; determining a variation value of the output parameter of the corresponding sensor of the sensor assembly within a set time as a parameter variation value of the corresponding sensor of the sensor assembly; and determining that the corresponding sensor of the sensor assembly is failed if the parameter variation value of the corresponding sensor of the sensor assembly is less than a preset variation threshold value of the corresponding sensor of the sensor assembly when it is determined that the deviation degree of the electrical parameter of the compressor is greater than a minimum value of a preset deviation range.

[0016] In some embodiments, the preset deviation degree range comprises a range consisting of a minimum value of the preset deviation degree range, the first deviation degree, the second deviation degree, and a maximum value of the preset deviation degree range in sequence; the control unit adjusts the protection threshold of the output parameter of the corresponding sensor in the sensor assembly according to the current value of the electrical parameter of the compressor to achieve the control and protection of the air conditioning system, comprising: determining the deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor as the deviation degree of the electrical parameter of the compressor, denoted as the deviation degree of the electrical parameter of the compressor, by taking the absolute value of the difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor, and then taking the ratio of the reference value of the electrical parameter of the compressor; determining the size relationship between the deviation degree of the electrical parameter of the compressor and the minimum value of the preset deviation degree range, the first deviation degree, the second deviation degree, and the maximum value of the preset deviation degree range; if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the minimum value of the preset deviation degree range and less than or equal to the first deviation degree, then the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a first preset proportion; if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the first deviation degree and less than or equal to the second deviation degree, then the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a second preset proportion, the second preset proportion being greater than the first preset proportion; if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the second deviation degree and less than or equal to the maximum value of the preset deviation degree range, then the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a third preset proportion, the third preset proportion being greater than the second preset proportion.

[0017] To match the above device, the application further provides an air conditioning system, comprising the above-mentioned control device of the air conditioning system.

[0018] To match the above method, the application further provides a storage medium, comprising a stored program, wherein when the program is running, the device where the storage medium is located executes the steps of the above-mentioned control method of the air conditioning system.

[0019] To match the above method, the application further provides a computer program product, comprising a computer program, which, when executed by a processor, realizes the steps of the above-mentioned control method of the air conditioning system.

[0020] Therefore, the scheme of the present application, in the case of sensor (such as temperature, pressure, etc. sensor) failure of the air conditioning system control, to the compressor electrical parameters in the air conditioning system to characterize the load state of the air conditioning system, according to the target frequency of the compressor to determine the reference value of the compressor electrical parameters, the current value of the compressor electrical parameters and the reference value are compared, and the detection value of the sensor (such as temperature, pressure, etc. sensor) of the air conditioning system is combined to cross verify and judge, to determine whether the sensor (such as temperature, pressure, etc. sensor) of the air conditioning system is invalid; In the case of determining that the sensor (such as temperature, pressure, etc. sensor) of the air conditioning system is invalid, a fuzzy control mechanism is introduced, the current value and the reference value of the compressor electrical parameters are compared, the protection threshold value corresponding to the invalid sensor in the sensor (such as temperature, pressure, etc. sensor) of the air conditioning system is dynamically adjusted, and the control and protection of the air conditioning system are realized; Therefore, by using the compressor electrical parameters in the air conditioning system to characterize the load state of the air conditioning system, the control and protection in the case of sensor (such as temperature, pressure, etc. sensor) failure are realized according to the compressor electrical parameters, and the operation stability and safety of the air conditioning system are ensured.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application.

[0022] The technical scheme of the present application will be described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The flowchart of an embodiment of the control method of the air conditioning system of the present application;

[0024] Figure 2 The flowchart of an embodiment of determining the reference value of the electrical parameters of the compressor in the method of the present application;

[0025] Figure 3 The flowchart of an embodiment of determining whether the corresponding sensor in the sensor assembly is invalid in the method of the present application;

[0026] Figure 4 The flowchart of an embodiment of adjusting the protection threshold value of the output parameter of the corresponding sensor in the sensor assembly in the method of the present application;

[0027] Figure 5 The structural diagram of an embodiment of the control device of the air conditioning system of the present application;

[0028] Figure 6 The flowchart of an intelligent control method for an air conditioning system sensor failure.

[0029] In the embodiments of the present application, the reference signs in the accompanying drawings are as follows:

[0030] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0032] It is considered that, in the case of failure or malfunction of the sensor of the air conditioning system, the air conditioning system often cannot accurately determine the running state, cannot normally control and protect according to the running device of the air conditioning system, and affects the running stability and safety of the air conditioning system. For example, in the case of failure or malfunction of the sensor of the air conditioning system, the air conditioning system often cannot accurately determine the running state, resulting in inaccurate control, energy efficiency decline, and even equipment damage.

[0033] In the related scheme, the solution can only realize single sensor failure diagnosis by comparing the detection data of multiple sensors, and lacks a mechanism for maintaining basic operation and protection function when multiple sensors fail at the same time. Therefore, there is an urgent need for an intelligent control method that can still effectively operate and realize automatic diagnosis and protection in the case of failure of the sensor of the air conditioning system.

[0034] Therefore, the scheme of the present application proposes a control method of an air conditioning system, specifically an intelligent control method under the condition of failure of the sensor of the air conditioning system, which indirectly represents the load state of the air conditioning system by using the electrical parameters (such as current and voltage) of the compressor, realizes monitoring of the running state of the air conditioning system, and ensures the stability of the air conditioning system.

[0035] According to an embodiment of the present application, a control method of an air conditioning system is provided, as shown in Figure 1 the flowchart of an embodiment of the method of the present application. The method is applied to control of the air conditioning system under the condition that the sensor component of the air conditioning system fails, the air conditioning system has a compressor and a sensor component, and as shown in Figure 1 the control method of the air conditioning system includes steps S110 to S140.

[0036] At step S110, in the case of running after starting of the air conditioning system, the electrical parameters of the compressor are acquired, and the output parameters of the corresponding sensor in the sensor component are acquired.

[0037] At step S120, a reference value of the electrical parameter of the compressor is determined according to the electrical parameter of the compressor.

[0038] At step S130, whether the corresponding sensor in the sensor assembly is failed is determined according to the reference value of the electrical parameter of the compressor, the current value of the electrical parameter of the compressor, and the output parameter of the corresponding sensor in the sensor assembly.

[0039] At step S140, if it is determined that the corresponding sensor in the sensor assembly is failed, a prompt message of the failure of the corresponding sensor in the sensor assembly is initiated; and / or, a protection threshold of the output parameter of the corresponding sensor in the sensor assembly is adjusted according to the current value of the electrical parameter of the compressor, so as to realize the control and protection of the air conditioning system.

[0040] In the scheme of the present application, in the case of failure of the sensor of the air conditioning system, the compressor electrical parameter (such as current, voltage) is used to indirectly represent the load state of the air conditioning system, so as to realize the monitoring of the running state of the air conditioning system. In this way, no matter what sensor of the air conditioning system is failed, the measure is taken, so as to ensure the stability of the air conditioning system; and the problem that the system running state cannot be effectively monitored and the protection of the air conditioning system cannot be realized when the temperature sensor, the pressure sensor, etc. of the air conditioning system is failed is solved.

[0041] In some embodiments, the electrical parameter of the compressor includes at least one of: a direct current bus voltage of the compressor, a three-phase current of the compressor; wherein the three-phase current of the compressor is an AC current of the compressor. And / or, the sensor assembly includes at least one of: a temperature sensor, a pressure sensor.

[0042] In step S110, the electrical parameter of the compressor is obtained by: obtaining a sampling value of the electrical parameter of the compressor, and taking an average value of the sampling value of the electrical parameter of the compressor obtained within a set time window as the obtained electrical parameter of the compressor.

[0043] In the scheme of the present application, an indirect load monitoring system based on the compressor electrical parameter (current, voltage) is established, which breaks through the limitation of the related scheme depending on the physical sensor, so that the air conditioning system can still maintain the monitoring ability of the running state in the case of sensor failure.

[0044] In some embodiments, the specific process of determining the reference value of the electrical parameter of the compressor according to the electrical parameter of the compressor in step S120 is described in the following exemplary description. The specific process of determining the reference value of the electrical parameter of the compressor in step S120 is further described below with reference to Figure 2 The embodiment flow diagram of the method of the present application for determining the reference value of the electrical parameter of the compressor is shown in the following figure, which further describes the specific process of determining the reference value of the electrical parameter of the compressor in step S120, including steps S210 to S220.

[0045] Step S210, the electrical parameter of the compressor obtained at the rated frequency of the compressor is recorded as the initial reference value of the electrical parameter of the compressor; specifically, for the rated frequency of the compressor, the electrical parameter of the compressor obtained at the rated frequency of the compressor is averaged in a set time window to obtain the initial reference value of the electrical parameter of the compressor; wherein the initial reference value of the electrical parameter of the compressor, such as the initial value E of the electrical parameter reference value of the air conditioning system in the rated frequency operation state. 初始 .

[0046] Step S220, the initial reference value of the electrical parameter of the compressor is corrected according to the target frequency of the compressor to obtain the corrected reference value of the electrical parameter of the compressor; and the corrected reference value of the electrical parameter of the compressor is determined as the reference value of the electrical parameter of the compressor. Wherein the target frequency of the compressor, such as the target frequency of the compressor output by the frequency converter of the air conditioning system.

[0047] In the scheme of the application, the electrical parameter reference value of the compressor is dynamically corrected based on the frequency of the frequency converter, thereby improving the judgment accuracy.

[0048] In some embodiments, in step S220, the initial reference value of the electrical parameter of the compressor is corrected according to the target frequency of the compressor to obtain the corrected reference value of the electrical parameter of the compressor, including: determining the difference value between the target frequency of the compressor and the rated frequency of the compressor, multiplying the difference value by a set correction coefficient, and then adding the product value to the initial reference value of the electrical parameter of the compressor to obtain the corrected reference value of the electrical parameter of the compressor.

[0049] Figure 6 It is a flowchart of an intelligent control method of an air conditioning system sensor failure. As shown in the figure, the scheme of the application provides an intelligent control method of an air conditioning system in the case of temperature or pressure sensor failure, including: Figure 6

[0050] Step 1, reference value acquisition and setting, obtaining the initial value E of the electrical parameter reference value of the air conditioning system in the rated frequency operation state, and then performing step 2. 初始

[0051] In step 1, in the development stage of the air conditioning system, the average value of the electrical parameter data (such as AC current, DC bus voltage, etc.) of the air conditioning system in the rated frequency F 额定 (i.e. the rated frequency F 额定 of the compressor) operation state in a set time window t is collected, and these data are written into the control system of the air conditioning system as reference values, recorded as E 初始 .​​

[0052] Among them, AC current is data collected by the air conditioning system's operating parameter monitoring system.

[0053] The reason for setting a time window 't' is that the electrical parameters (such as current) input to the air conditioning system under rated frequency operation naturally fluctuate during transient processes such as system start-up, shutdown, and load switching (for example, the starting current can reach 2 to 3 times the rated value). If a direct instantaneous comparison is performed, it is easy to cause misjudgment due to transient interference (such as misjudging the starting current fluctuation as sensor failure). Using the average value within a set time window 't' (such as 30 to 60 seconds) can smooth out transient noise and retain only the steady-state operating characteristics of the air conditioning system.

[0054] Step 2: Reference value correction, to obtain the initial value E of the electrical parameter reference value of the air conditioning system under rated frequency operation. 初始 Corrected reference value E 基准 Then proceed to step 2.

[0055] In step 2, the inverter output frequency F (i.e., the compressor target frequency F determined by the control system) is introduced as an auxiliary parameter to initialize the reference value E of the electrical parameters of the air conditioning system under rated frequency operation. 初始 Dynamic correction is performed to obtain the correction value E of the electrical parameter reference value. 基准 When the inverter output frequency F changes, the corresponding electrical parameter reference value E is dynamically adjusted. 基准 This eliminates the impact of inverter output frequency F changes on the judgment results, thereby improving the accuracy of the judgment and the robustness of the air conditioning system.

[0056] E 基准 =E 初始 ×[1+k×(FF 额定 )];

[0057] Where k is the system calibration coefficient, determined experimentally; the unit of k is seconds; since E (such as the initial value of the electrical parameter reference value E) 初始 Correction value E of electrical parameter reference value 基准 E can represent multiple electrical parameters (such as AC current, DC bus voltage, etc.). Therefore, the range of k varies depending on the parameter represented by E. For example, when E represents current, the range of k is approximately 0.02 to 0.05.

[0058] Where F is the frequency, in Hz = 1 / s, and k is in seconds; they cancel each other out when multiplied. E 基准 With E 初始 The units are the same, E 初始 Multiplying by a dimensionless number and then using the unit still results in E. 基准 The units are the same.

[0059] In the scheme of the present application, the reference value is dynamically corrected by introducing the output frequency of the frequency converter, the influence of environmental changes on the judgment result is eliminated, and the robustness of the air conditioning system is improved.

[0060] In some embodiments, the specific process of determining whether the corresponding sensor in the sensor assembly is failed in step S130 according to the reference value of the electrical parameter of the compressor, the current value of the electrical parameter of the compressor, and the output parameter of the corresponding sensor in the sensor assembly, see the following exemplary description.

[0061] The following will be described in detail with reference to the accompanying drawings. Figure 3 An embodiment flowchart of determining whether the corresponding sensor in the sensor assembly is failed in the method of the present application is shown in the accompanying drawings, which further illustrates the specific process of determining whether the corresponding sensor in the sensor assembly is failed in step S130, including steps S310 to S340.

[0062] In step S310, the electrical parameter of the compressor obtained after the air conditioning system runs for a set time is recorded as the current value of the electrical parameter of the compressor.

[0063] In step S320, the ratio of the absolute value of the difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor to the reference value of the electrical parameter of the compressor is determined as the deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor, recorded as the deviation degree of the electrical parameter of the compressor; wherein the deviation degree of the electrical parameter of the compressor, such as the deviation percentage ΔE%=|current electrical parameter E-E 基准 | / E 基准 ×100%.

[0064] In step S330, the change value of the output parameter of the corresponding sensor in the sensor assembly within a set time is determined, recorded as the parameter change value of the corresponding sensor in the sensor assembly.

[0065] In step S340, in the case where it is determined that the deviation degree of the electrical parameter of the compressor is greater than the minimum value of the preset deviation degree range, if it is determined that the parameter change value of the corresponding sensor in the sensor assembly is less than the preset change value threshold of the corresponding sensor in the sensor assembly, the corresponding sensor in the sensor assembly is determined; wherein the minimum value of the preset deviation degree range is a preset threshold X%, and the preset change value threshold of the corresponding sensor in the sensor assembly is Y.

[0066] As Figure 6 shown, the scheme of the present application provides an intelligent control method of an air conditioning system in the case where a temperature or pressure sensor is failed, which further includes:

[0067] Step 3, parameter comparison: after the air conditioning system runs for a set time (such as about 10 minutes), the air conditioning system collects the average value of the electrical parameters of the air conditioning system in the set time window t to obtain the current electrical parameter E of the air conditioning system; and the current electrical parameter E of the air conditioning system is compared with the electrical parameter reference value E 基准 , that is, the initial value E 初始 of the electrical parameter reference value of the air conditioning system in the rated frequency running state 基准 is dynamically corrected to obtain the correction value E 基准 of the electrical parameter reference value. The set time window t is about 30 seconds to 60 seconds, which smooths the transient noise and only retains the system steady state operation characteristics.

[0068] If the deviation percentage AE% of the current electrical parameter E from the electrical parameter reference value E 基准 exceeds the preset threshold X% (such as the deviation percentage AE% is greater than 5%, that is, the deviation percentage AE% of the current electrical parameter E from the electrical parameter reference value E 基准 exceeds 5%), the next verification process is entered, that is, step 4 is executed. If the deviation percentage AE% of the current electrical parameter E from the electrical parameter reference value E 基准 does not exceed the preset threshold X%, the current state is maintained and the air conditioning system continues to run.

[0069] The deviation percentage AE% = |current electrical parameter E-E 基准 | / E 基准 x 100%.

[0070] Step 4, cross verification: in the verification process, the air conditioning system combines the change trend of the electrical parameter itself with the feedback data of the temperature and pressure sensors to perform cross verification. The change trend of the electrical parameter itself is the size of the deviation percentage AE%. For example, if the electrical parameter deviates significantly and the temperature and pressure parameter change values are less than Y (such as the temperature change value is less than 0.5°C, or the pressure parameter change value is less than 0.5 Pa), it is determined that the sensor is faulty, and then step 5 is executed. In related schemes, the comparison of the electrical parameter is added on the basis of the sensor failure protection, which can ensure that protection can be normally performed when multiple sensors fail. Each sensor is separately determined, and if the change value of a parameter is less than Y, it is determined that the sensor corresponding to the parameter is faulty.

[0071] In step 4, the compressor electrical parameters (current, voltage) are directly related to the physical load of the air conditioning system (such as refrigerant flow, compressor load), and their changes are necessarily driven by real working conditions (such as high outdoor temperature, air conditioning running state change), and are not affected by sensor failure. Under real working conditions, the temperature or pressure sensor feedback value must be consistent with the change trend of the electrical parameter. If the sensor is working normally, the data change must exist; otherwise, if there is no obvious change in the data, it indicates that there is a failure problem in the sensor itself.

[0072] In the scheme of the present application, the verification process is triggered by comparing the electrical parameter of the compressor in the time window with the reference value, combined with the threshold judgment mechanism. In this way, by setting the comparison mechanism of the electrical parameter in the time window with the reference value, combined with the preset threshold value to determine whether to enter the verification process, the accuracy of the judgment is improved.

[0073] In the scheme of the present application, the sensor failure condition is identified by the cross verification mechanism of the electrical parameter of the compressor and the temperature and pressure sensors. In this way, by the self-verification of the electrical parameter and the cross verification mechanism of the sensors, the sensor failure condition can be effectively identified.

[0074] In some embodiments, the preset deviation range includes: a range consisting of a minimum value of the preset deviation range, a first deviation, a second deviation, and a maximum value of the preset deviation range in order of increasing size; wherein the minimum value of the preset deviation range is X%, the first deviation is X1%, the second deviation is X2%, and the maximum value of the preset deviation range is X3%.

[0075] In step S140, when it is determined that the corresponding sensor in the sensor assembly is failed, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is adjusted according to the current value of the electrical parameter of the compressor, to realize the specific process of control and protection of the air conditioning system. See the following exemplary description.

[0076] The following will be described in conjunction with Figure 4 An embodiment flowchart of adjusting the protection threshold of the output parameter of the corresponding sensor in the sensor assembly in the method of the present application is shown in FIG. 13, which further illustrates the specific process of adjusting the protection threshold of the output parameter of the corresponding sensor in the sensor assembly in step S140, including steps S410 to S450.

[0077] In step S410, the electrical parameter of the compressor obtained after the air conditioning system runs for a set time is recorded as the current value of the electrical parameter of the compressor; the absolute value of the difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor is determined as the ratio of the reference value of the electrical parameter of the compressor, and the deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor is recorded as the deviation degree of the electrical parameter of the compressor, denoted as ΔE%. The deviation degree of the electrical parameter of the compressor, such as the deviation percentage ΔE%=|current electrical parameter E-E 基准 | / E 基准 ×100%.

[0078] In step S420, the deviation degree of the electrical parameter of the compressor is determined in relation to the minimum value of the preset deviation range, the first deviation, the second deviation, and the maximum value of the preset deviation range.

[0079] Step S430, if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the minimum value of the preset deviation degree range and less than or equal to the first deviation degree, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a first preset proportion; wherein the first preset proportion is, for example, Δθ = Z1% = 3%.

[0080] Step S440, if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the first deviation degree and less than or equal to the second deviation degree, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a second preset proportion, the second preset proportion being greater than the first preset proportion; wherein the first preset proportion is, for example, Δθ = Z2% = 8%.

[0081] Step S450, if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the second deviation degree and less than or equal to the maximum value of the preset deviation degree range, the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a third preset proportion, the third preset proportion being greater than the second preset proportion; wherein the first preset proportion is, for example, Δθ = Z3% = 15%.

[0082] As shown in Figure 6 , the scheme of the present application provides an intelligent control method of an air conditioning system in the case of failure of a temperature or pressure sensor, further comprising:

[0083] Step 5, failure determination and intelligent protection: if the sensor is confirmed to be failed, the air conditioning system outputs a fault code (such as E01), and a fuzzy control mechanism is designed to dynamically adjust the electrical parameter protection threshold according to the deviation degree of the current electrical parameter E (i.e. the deviation percentage ΔE% of the current electrical parameter E from the electrical parameter reference value E 基准 , so as to ensure that in the case of overload, the shutdown protection can be preferentially triggered to avoid damage to the equipment.

[0084] The fuzzy control mechanism, i.e. using "fuzzy language" (such as "mild deviation" and "moderate deviation" in the example) instead of precise numerical values, determines the adjustment amplitude according to the past experience of the designer, and realizes nonlinear control. After it is determined that the sensor is failed, only the electrical parameter protection threshold is adjusted according to the deviation degree of the current electrical parameter E.

[0085] An example of fuzzy control threshold dynamic adjustment (i.e. using the fuzzy control mechanism to dynamically adjust the electrical parameter protection threshold according to the deviation degree of the current electrical parameter E) is as follows:

[0086] Input variable: the deviation percentage ΔE% of the current compressor electrical parameter from the reference value, i.e. the deviation percentage ΔE% of the current electrical parameter E from the electrical parameter reference value E 基准 .

[0087] Output variable: the reduction amplitude of the electric parameter protection threshold (Δθ, value Z%), Δθ represents the protection threshold adjustment amplitude, and Z% represents the specific value of the adjustment. The fuzzy rule base design is shown in Table 1.

[0088] Table 1

[0089] Deviation (ΔΕ%) Fuzzy language variable Protection threshold adjustment magnitude (Δθ=Z%) X% = 5% < ΔΕ% ≤ X1% = 15% Mild deviation Protection threshold reduction magnitude Δθ=Z1%=3% X1% = 15% < ΔΕ% ≤ X2% = 20% Moderate deviation Protection threshold reduction magnitude Δθ=Z2%=8% X3%≥ΔΕ%>X2%=20% Severe deviation Protection threshold reduction magnitude Δθ=Z3%=15%

[0090] In order to ensure that the trigger threshold is dynamically adjusted in the interval from the severe deviation to the trigger shutdown protection, X3 = ΔE is required. MAX (the maximum deviation value of ΔE, and shutdown protection is required if it is larger), for example: E 基准 = 5A, the original threshold = 10A, and Δθ = Z3% = 15%, at this time X3 = ΔE MAX = 70.

[0091] Fuzzy reasoning process: the air conditioning system calculates ΔE% in real time, maps it to a fuzzy language variable through a membership function, triggers the fuzzy rule base to output Δθ%, and the new protection threshold = the original overload threshold * (1-Δθ%). For example, the original threshold 10A triggers shutdown protection -> Δθ% = 8%, and the new threshold = 10 * (1-0.08) = 9.2A triggers shutdown protection.

[0092] Among them, the membership function: a mathematical tool for mapping "exact numerical value" to "fuzzy degree" (for example: when the deviation degree is 5% < ΔE% ≤ 15%, it is mapped to "mild deviation"). Fuzzy language variable: a "variable" described in human language, which is the carrier of the membership function, that is, mild deviation, moderate deviation, and severe deviation in Table 1. Fuzzy rule base: a set of "IF-THEN" rules based on expert experience, which is the "brain" of fuzzy control, for example: IF fuzzy language variable = mild deviation, THEN protection threshold adjustment amplitude = 3%.

[0093] In the scheme of the application, a fuzzy control mechanism is introduced to dynamically adjust the protection threshold according to the deviation degree of the compressor electric parameter, and the protection capability of the air conditioning system is improved. In the scheme of the application, the fuzzy control mechanism is introduced to dynamically adjust the protection threshold according to the deviation degree of the electric parameter, a hierarchical protection strategy is formed, the air conditioning system preferentially triggers shutdown protection under an overload working condition, and therefore the stability of the air conditioning system and the safety of equipment operation are further improved.

[0094] In the scheme of the application, the compressor electric parameter is compared with the reference value, cross verification is performed in combination with temperature, pressure and other sensors, a fuzzy control mechanism is introduced to dynamically adjust the protection threshold according to the deviation degree of the electric parameter, and a hierarchical protection strategy is realized. In this way, not only the running problem of the air conditioning system under the condition that a sensor fails is solved, but also a solution to the simultaneous failure of multiple sensors is provided, and the reliability and safety of the air conditioning system are significantly improved.

[0095] In the related scheme, the scheme directly stops or does not stop after the sensor fails, which is easy to cause some problems, such as: false stop: the occasional failure of the sensor (such as poor contact) does not affect the system operation; safety risk: if the system still operates after the sensor fails, the compressor is burned due to no effective protection when overloaded. In the scheme of the present application, the protection threshold is dynamically adjusted, so that the response level matches the risk level: the deviation degree is positively correlated with the risk of equipment damage (the probability of compressor burning is > 80% when the deviation is 20%), and the fuzzy control mechanism is introduced, which can realize accurate matching of risk and protection intensity.

[0096] In the scheme of the present application, the sensor failure detection mechanism: based on the comparison of the electrical parameters (current, voltage) of the compressor and the reference value, the deviation threshold in the time window triggers verification, and the electrical parameters are cross-verified with the temperature or pressure sensor; the electrical parameters are directly related to the physical load of the system and are not affected by sensor failure; multi-sensor simultaneous failure processing capability: can handle the case of multiple sensor failures; system protection mechanism: fuzzy control mechanism dynamically adjusts the protection threshold, and protects according to the deviation degree of the electrical parameters, preferentially triggers the overload shutdown protection, realizes the hierarchical protection strategy, and significantly improves the reliability and safety of the air conditioning system.

[0097] By adopting the technical scheme of the embodiment, in the case of sensor (such as temperature, pressure, etc.) failure of the air conditioning system, the load state of the air conditioning system is represented by the electrical parameters of the compressor in the air conditioning system, the reference value of the electrical parameters of the compressor is determined according to the target frequency of the compressor, the current value of the electrical parameters of the compressor is compared with the reference value, and the detection value of the sensor (such as temperature, pressure, etc.) of the air conditioning system is cross-verified to determine whether the sensor (such as temperature, pressure, etc.) of the air conditioning system fails; in the case of determining that the sensor (such as temperature, pressure, etc.) of the air conditioning system fails, a fuzzy control mechanism is introduced, the protection threshold of the failed sensor in the sensor (such as temperature, pressure, etc.) of the air conditioning system is dynamically adjusted according to the comparison result of the current value and the reference value of the electrical parameters of the compressor, and the control and protection of the air conditioning system are realized; thereby, by representing the load state of the air conditioning system by the electrical parameters of the compressor in the air conditioning system, the control and protection in the case of sensor (such as temperature, pressure, etc.) failure are realized according to the electrical parameters of the compressor, and the operation stability and safety of the air conditioning system are ensured.

[0098] According to the embodiment of the present application, a control device of an air conditioning system corresponding to a control method of the air conditioning system is also provided. Referring to Figure 5 The structure schematic diagram of an embodiment of the device of the present application is shown. The control device of the air conditioning system is applied to control the air conditioning system in the case of failure of the sensor assembly of the air conditioning system, the air conditioning system has a compressor and a sensor assembly; in the scheme of the present application, as shown inFigure 5 The control device of the air conditioning system comprises an acquisition unit 102 and a control unit 104.

[0099] The acquisition unit 102 is configured to acquire the electrical parameter of the compressor and the output parameter of the corresponding sensor in the sensor assembly in the case that the air conditioning system is running.

[0100] The control unit 104 is configured to determine the reference value of the electrical parameter of the compressor according to the electrical parameter of the compressor.

[0101] The control unit 104 is further configured to determine whether the corresponding sensor in the sensor assembly is failed according to the reference value of the electrical parameter of the compressor, the current value of the electrical parameter of the compressor, and the output parameter of the corresponding sensor in the sensor assembly.

[0102] The control unit 104 is further configured to initiate a prompt message for the failure of the corresponding sensor in the sensor assembly if it is determined that the corresponding sensor in the sensor assembly is failed, and / or adjust the protection threshold of the output parameter of the corresponding sensor in the sensor assembly according to the current value of the electrical parameter of the compressor to realize the control and protection of the air conditioning system.

[0103] In the scheme of the present application, the compressor electrical parameter (such as current, voltage) is used to indirectly represent the load state of the air conditioning system to realize the monitoring of the running state of the air conditioning system in the case that the sensor of the air conditioning system is failed. Thus, this measure is taken regardless of the failure of any sensor of the air conditioning system to ensure the stability of the air conditioning system, and the problem that the system running state cannot be effectively monitored and the protection of the air conditioning system cannot be realized when the temperature sensor, pressure sensor, etc. of the air conditioning system is failed is solved.

[0104] In some embodiments, the electrical parameter of the compressor comprises at least one of the DC bus voltage of the compressor and the three-phase current of the compressor (e.g., the AC current of the compressor), and the sensor assembly comprises at least one of a temperature sensor and a pressure sensor.

[0105] The acquisition unit 102 acquires the electrical parameter of the compressor, including: the acquisition unit 102 is specifically further configured to acquire the sampling value of the electrical parameter of the compressor, and the average value of the sampling value of the electrical parameter of the compressor acquired within a set time window is taken as the acquired electrical parameter of the compressor.

[0106] In the scheme of the application, an indirect load monitoring system based on the electrical parameter (current, voltage) of the compressor is established, which breaks through the limitation of related schemes relying on physical sensors, so that the air conditioning system can still maintain the monitoring ability of the operating state in the case of sensor failure.

[0107] In some embodiments, the control unit 104 determines the reference value of the electrical parameter of the compressor according to the electrical parameter of the compressor, including:

[0108] The control unit 104 is specifically further configured to take the electrical parameter of the compressor acquired at the rated frequency of the compressor as the initial reference value of the electrical parameter of the compressor; specifically, for the rated frequency of the compressor, the electrical parameter of the compressor acquired at the rated frequency of the compressor is averaged within a set time window to obtain the initial reference value of the electrical parameter of the compressor; wherein the initial reference value of the electrical parameter of the compressor is, for example, the initial value E of the electrical parameter reference value of the air conditioning system in the rated frequency operating state. 初始 The specific functions and processes of the control unit 104 are also described in step S210.

[0109] The control unit 104 is specifically further configured to correct the initial reference value of the electrical parameter of the compressor according to the target frequency of the compressor to obtain the corrected reference value of the electrical parameter of the compressor; and determine the corrected reference value of the electrical parameter of the compressor as the reference value of the electrical parameter of the compressor. Wherein the target frequency of the compressor is, for example, the target frequency of the compressor output by the frequency converter of the air conditioning system. The specific functions and processes of the control unit 104 are also described in step S220.

[0110] In the scheme of the application, the electrical parameter reference value of the compressor is dynamically corrected based on the frequency of the frequency converter, which improves the judgment accuracy.

[0111] In some embodiments, the control unit 104 corrects the initial reference value of the electrical parameter of the compressor according to the target frequency of the compressor to obtain the corrected reference value of the electrical parameter of the compressor, including:

[0112] The control unit 104 is further configured to determine a difference between the target frequency of the compressor and the rated frequency of the compressor, multiply the difference by a set correction coefficient, and add a product value to an initial reference value of the electrical parameter of the compressor to obtain a corrected reference value of the electrical parameter of the compressor.

[0113] Figure 6 It is a flowchart of an intelligent control method for an air conditioning system sensor failure. Figure 6 As shown in the figure, the scheme of the present application provides an intelligent control method for an air conditioning system in the case of temperature or pressure sensor failure, which comprises:

[0114] Step 1, reference value acquisition and setting, obtaining an initial value E 初始 of the electrical parameter reference value of the air conditioning system in the rated frequency operating state, and then performing step 2.

[0115] In step 1, during the development stage of the air conditioning system, the average value of the electrical parameter data (such as AC current, DC bus voltage, etc.) of the air conditioning system in the rated frequency F 额定 (i.e. the rated frequency F 额定 of the compressor) operating state within a set time window t is collected, and these data are written into the control system of the air conditioning system as reference values, denoted as E 初始 .

[0116] Among them, the AC current is the data collected by the parameter monitoring system when the air conditioning system is running.

[0117] The set time window t is set because the electrical parameter input (such as current) of the air conditioning system in the rated frequency operating state has natural fluctuations (for example, the starting current can reach 2-3 times the rated value) during transient processes such as air conditioning system start-stop and load switching. If instantaneous comparison is directly performed, it is easy to cause misjudgment (such as misjudging the starting current fluctuation as sensor failure) due to transient interference. The average value within the set time window t (such as 30-60 seconds) can smooth the transient noise and only retain the steady-state operating characteristics of the air conditioning system.

[0118] Step 2, reference value correction, obtaining the corrected reference value E 初始 of the initial value E 基准 of the electrical parameter reference value of the air conditioning system in the rated frequency operating state, and then performing step 2.

[0119] In step 2, the frequency F of the frequency converter (i.e. the target frequency F of the compressor determined by the control system) is introduced as an auxiliary parameter to dynamically correct the initial value E 初始 of the electrical parameter reference value of the air conditioning system in the rated frequency operating state to obtain the corrected value E 基准. When the frequency F of the inverter output changes, the electric parameter reference value E is dynamically adjusted accordingly 基准 , so as to eliminate the influence of the change of the inverter output frequency F on the judgment result and improve the accuracy of the judgment and the robustness of the air conditioning system.

[0120] E 基准 = E 初始 × [1 + k × (F - F 额定 )];

[0121] Wherein, k is a system calibration coefficient, which is determined through experiments; the unit of k is second; since E (such as the initial value E 初始 of the electric parameter reference value, the correction value E 基准 of the electric parameter reference value) can represent multiple electric parameters (such as AC current, DC bus voltage, etc.), for different electric parameters, so the range of k is different according to the different parameters represented by E. For example: when E represents the current, the range of k is about 0.02~0.05.

[0122] In the scheme of the present application, the reference value is dynamically corrected by introducing the inverter output frequency, the influence of environmental changes on the judgment result is eliminated, and the robustness of the air conditioning system is improved.

[0123] In some embodiments, the control unit 104 determines whether the corresponding sensor in the sensor assembly fails according to the reference value of the electric parameter of the compressor, the current value of the electric parameter of the compressor, and the output parameter of the corresponding sensor in the sensor assembly, comprising:

[0124] The control unit 104 is specifically further configured to record the electric parameter of the compressor obtained after the air conditioning system runs for a set time as the current value of the electric parameter of the compressor. The specific functions and processes of the control unit 104 are also referred to step S310.

[0125] The control unit 104 is specifically further configured to determine the deviation degree of the current value of the electric parameter of the compressor relative to the reference value of the electric parameter of the compressor as the deviation degree of the electric parameter of the compressor, recorded as the deviation degree of the electric parameter of the compressor, by taking the absolute value of the difference between the current value of the electric parameter of the compressor and the reference value of the electric parameter of the compressor, and taking the ratio of the reference value of the electric parameter of the compressor; wherein the deviation degree of the electric parameter of the compressor, such as the deviation percentage ΔE%=|current electric parameter E-E 基准 | / E 基准 × 100%. The specific functions and processes of the control unit 104 are also referred to step S320.

[0126] The control unit 104 is specifically further configured to determine a variation value of an output parameter of a corresponding sensor in the sensor assembly within a set time, denoted as a parameter variation value of the corresponding sensor in the sensor assembly. The specific functions and processes of the control unit 104 are also described in step S330.

[0127] The control unit 104 is specifically further configured to, in a case where it is determined that the deviation degree of the electrical parameter of the compressor is greater than a minimum value of a preset deviation degree range, if it is determined that the parameter variation value of the corresponding sensor in the sensor assembly is less than a preset variation value threshold of the corresponding sensor in the sensor assembly, determine the corresponding sensor in the sensor assembly; wherein the minimum value of the preset deviation degree range is like a preset threshold X%, and the preset variation value threshold of the corresponding sensor in the sensor assembly is like Y. The specific functions and processes of the control unit 104 are also described in step S340.

[0128] As shown in Figure 6 , the scheme of the present application provides an intelligent control method of an air conditioning system in the case of failure of a temperature or pressure sensor, which further comprises:

[0129] Step 3, parameter comparison: after the air conditioning system runs for a set time (such as about 10 minutes), the air conditioning system collects the average value of the electrical parameter of the air conditioning system within a set time window t, to obtain the current electrical parameter E of the air conditioning system; and compares the current electrical parameter E of the air conditioning system with the electrical parameter reference value E 基准 (initial value of the electrical parameter reference value of the air conditioning system in the rated frequency running state E 初始 ) which is dynamically corrected to obtain the corrected value E 基准 of the electrical parameter reference value. The set time window t is about 30 seconds to 60 seconds, to smooth transient noise and only retain the steady-state running characteristics of the system.

[0130] If the deviation percentage ΔE% of the current electrical parameter E from the electrical parameter reference value E 基准 exceeds a preset threshold X% (such as the deviation percentage ΔE% is greater than 5%, that is, the deviation percentage ΔE% of the current electrical parameter E from the electrical parameter reference value E 基准 exceeds 5%), the next verification process is entered, that is, step 4 is executed.

[0131] The deviation percentage ΔE% = |current electrical parameter E-E 基准 | / E 基准 × 100%.

[0132] Step 4, cross-validation: in the verification process, the air conditioning system combines the change trend of the electric parameter itself with the feedback data of the temperature and pressure sensors for cross-validation. For example, if the electric parameter deviates significantly and the temperature and pressure parameter change values are less than Y (for example, the temperature change value is less than 0.5℃, and for example, the pressure parameter change value is less than 0.5Pa), it is determined that the sensor is faulty, and then step 5 is performed. In the related scheme, the comparison of the electric parameter is added on the basis of the sensor failure protection, which can ensure that the protection can be normally carried out when multiple sensors fail.

[0133] In step 4, the compressor electric parameter (current, voltage) is directly related to the physical load of the air conditioning system (such as refrigerant flow, compressor load), and its change is inevitably driven by the real working condition (such as high outdoor temperature, air conditioning operating state change), and is not affected by sensor failure. Under the real working condition, the temperature or pressure sensor feedback value must be consistent with the change trend of the electric parameter. If the sensor is working normally, the data change must exist; otherwise, if there is no obvious change in the data, it indicates that there is a failure problem in the sensor itself.

[0134] In the scheme of the application, the compressor electric parameter in the time window is compared with the reference value, and the verification process is triggered by combining the threshold value judgment mechanism. In this way, by setting the comparison mechanism of the electric parameter in the time window and the reference value, whether to enter the verification process is judged by combining the preset threshold value, which improves the accuracy of the judgment.

[0135] In the scheme of the application, the compressor electric parameter and the cross-validation mechanism of the temperature and pressure sensors are used to identify the sensor failure condition. In this way, by using the electric parameter self-validation and the sensor cross-validation mechanism, the sensor failure condition can be effectively identified.

[0136] In some embodiments, a preset deviation degree range is included: a range composed of a minimum value of the preset deviation degree range, a first deviation degree, a second deviation degree, and a maximum value of the preset deviation degree range in order of increasing; wherein the minimum value of the preset deviation degree range is X%, the first deviation degree is X1%, the second deviation degree is X2%, and the maximum value of the preset deviation degree range is X3%.

[0137] The control unit 104, in a case where it is determined that a corresponding sensor in the sensor assembly is faulty, adjusts a protection threshold of an output parameter of the corresponding sensor in the sensor assembly according to a current value of the electric parameter of the compressor, to realize control and protection of the air conditioning system, including:

[0138] The control unit 104 is specifically further configured to take the electrical parameter of the compressor obtained after the air conditioning system runs for the set time as a current value of the electrical parameter of the compressor; take a ratio of an absolute value of a difference between the current value of the electrical parameter of the compressor and the reference value of the electrical parameter of the compressor to the reference value of the electrical parameter of the compressor as a deviation degree of the current value of the electrical parameter of the compressor relative to the reference value of the electrical parameter of the compressor, and record as a deviation degree of the electrical parameter of the compressor; wherein the deviation degree of the electrical parameter of the compressor, such as a deviation percentage ΔE%=|current electrical parameter E-E 基准 | / E 基准 ×100%. The specific functions and processes of the control unit 104 are also described in step S410.

[0139] The control unit 104 is specifically further configured to determine the size relationship of the deviation degree of the electrical parameter of the compressor and the minimum value, the first deviation degree, the second deviation degree, and the maximum value of the preset deviation degree range. The specific functions and processes of the control unit 104 are also described in step S420.

[0140] The control unit 104 is specifically further configured to reduce the protection threshold of the output parameter of the corresponding sensor in the sensor assembly by a first preset proportion if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the minimum value of the preset deviation degree range and less than or equal to the first deviation degree; wherein the first preset proportion is, for example, Δθ=Z1%=3%. The specific functions and processes of the control unit 104 are also described in step S430.

[0141] The control unit 104 is specifically further configured to reduce the protection threshold of the output parameter of the corresponding sensor in the sensor assembly by a second preset proportion if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the first deviation degree and less than or equal to the second deviation degree, the second preset proportion being greater than the first preset proportion; wherein the first preset proportion is, for example, Δθ=Z2%=8%. The specific functions and processes of the control unit 104 are also described in step S440.

[0142] The control unit 104 is specifically further configured to reduce the protection threshold of the output parameter of the corresponding sensor in the sensor assembly by a third preset proportion if it is determined that the deviation degree of the electrical parameter of the compressor is greater than the second deviation degree and less than or equal to the maximum value of the preset deviation degree range, the third preset proportion being greater than the second preset proportion; wherein the first preset proportion is, for example, Δθ=Z3%=15%. The specific functions and processes of the control unit 104 are also described in step S450.

[0143] As Figure 6As shown, the present invention provides an intelligent control method for an air conditioning system in the event of temperature or pressure sensor failure, and further includes:

[0144] Step 5, Failure Determination and Intelligent Protection: If sensor failure is confirmed, the air conditioning system outputs a fault code (e.g., E01) and designs a fuzzy control mechanism based on the degree of deviation of the current electrical parameter E (i.e., the deviation of the current electrical parameter E from the reference value E). 基准 The deviation percentage ΔE% is dynamically adjusted to control the electrical parameter protection threshold, ensuring that shutdown protection can be triggered first under overload conditions to avoid equipment damage.

[0145] The fuzzy control mechanism uses "fuzzy language" (such as "slight deviation" and "moderate deviation" in the example) instead of precise numerical values, and determines the adjustment range based on the designer's past experience to achieve non-linear control. When a sensor failure is determined, only the electrical parameter protection threshold is adjusted according to the degree of deviation of the current electrical parameter E.

[0146] The following is an example of dynamic adjustment of fuzzy control threshold (i.e., using a fuzzy control mechanism to dynamically adjust the electrical parameter protection threshold based on the degree of deviation of the current electrical parameter E):

[0147] Input variable: The percentage deviation of the current compressor electrical parameter from the reference value, ΔE%, that is, the deviation of the current electrical parameter E from the reference value E. 基准 The percentage deviation ΔE%.

[0148] Output variable: The reduction magnitude of the electrical parameter protection threshold (Δθ, value Z%), where Δθ represents the adjustment magnitude of the protection threshold and Z% represents the specific adjustment value. The fuzzy rule base design is shown in Table 1.

[0149] Fuzzy inference process: The air conditioning system calculates ΔE% in real time, maps it to fuzzy linguistic variables through membership functions, and triggers the fuzzy rule base to output Δθ%. The new protection threshold = the original overload threshold × (1 - Δθ%). For example, the original threshold of 10A triggers shutdown protection → Δθ% = 8%, the new threshold = 10 × (1 - 0.08) = 9.2A triggers shutdown protection.

[0150] In this invention, a fuzzy control mechanism is introduced to dynamically adjust the protection threshold based on the degree of deviation of the compressor's electrical parameters, thereby enhancing the protection capability of the air conditioning system. Furthermore, by introducing a fuzzy control mechanism to dynamically adjust the protection threshold based on the degree of deviation of electrical parameters, a tiered protection strategy is formed, enabling the air conditioning system to preferentially trigger shutdown protection under overload conditions, thus further improving the stability of the air conditioning system and the safety of equipment operation.

[0151] In the scheme of the present application, the compressor electrical parameters are compared with the reference value, combined with cross verification of temperature, pressure and other sensors; a fuzzy control mechanism is also introduced, and the protection threshold is dynamically adjusted according to the deviation degree of electrical parameters, so as to realize the grading protection strategy. In this way, not only the running problem of the air conditioning system under the condition of sensor failure is solved, but also a solution for handling the simultaneous failure of multiple sensors is provided, and the reliability and safety of the air conditioning system are significantly improved.

[0152] In the related scheme, the system directly stops or does not stop after the sensor fails, which may easily lead to some problems, such as: false shutdown: the occasional failure of the sensor (such as poor contact) does not affect the system operation; safety risk: if the system still runs after the sensor fails, the compressor may be burned due to no effective protection when overloaded. In the scheme of the present application, the protection threshold is dynamically adjusted, so that the response level matches the risk level: the deviation degree is positively correlated with the risk of equipment damage (when the deviation is 20%, the probability of compressor burning is >80%), and the fuzzy control mechanism is introduced, so that the risk and the protection intensity can be accurately matched.

[0153] In the scheme of the present application, the sensor failure detection mechanism is based on the comparison of the electrical parameters (current, voltage) of the compressor with the reference value, the deviation threshold in the time window is set to trigger verification, and the electrical parameters are cross-verified with temperature or pressure sensors; the electrical parameters are directly related to the physical load of the system and are not affected by sensor failure; the multiple sensor simultaneous failure processing capability: the multiple sensor simultaneous failure condition can be handled; the system protection mechanism: the fuzzy control mechanism dynamically adjusts the protection threshold, and the electrical parameters are protected according to the deviation degree, the overload shutdown protection is preferentially triggered, the grading protection strategy is realized, and the reliability and safety of the air conditioning system are significantly improved.

[0154] Since the processing and functions realized by the device of the present embodiment basically correspond to the embodiments, principles and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0155] According to the embodiments of the present application, a computer program product corresponding to the control method of the air conditioning system is also provided, which comprises a computer program, and the computer program is executed by a processor to realize the steps of the control method of the air conditioning system described above.

[0156] Since the processing and functions realized by the air conditioning system of the present embodiment basically correspond to the embodiments, principles and examples of the foregoing device, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0157] According to the embodiments of the present application, a computer program product corresponding to the control method of the air conditioning system is also provided, which comprises a computer program, and the computer program is executed by a processor to realize the steps of the control method of the air conditioning system described above.

[0158] Since the processing and functions realized by the product of the embodiment basically correspond to the embodiments, principles and examples of the foregoing method, the description of the embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0159] According to the embodiment of the present application, a storage medium corresponding to the control method of the air conditioning system is also provided, which comprises a stored program, wherein when the program is run, the device where the storage medium is located performs the steps of the control method of the air conditioning system described above.

[0160] Since the processing and functions realized by the storage medium of the embodiment basically correspond to the embodiments, principles and examples of the foregoing method, the description of the embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0161] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0162] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes a compressor and sensor components; the control method of the air conditioning system includes: When the air conditioning system is running after startup, the electrical parameters of the compressor are acquired, and the output parameters of the corresponding sensors in the sensor assembly are acquired. Based on the electrical parameters of the compressor, determine the reference values ​​of the electrical parameters of the compressor; Based on the baseline value of the compressor's electrical parameters, the current value of the compressor's electrical parameters, and the output parameters of the corresponding sensors in the sensor assembly, determine whether the corresponding sensors in the sensor assembly are malfunctioning. If it is determined that a corresponding sensor in the sensor assembly has failed, a notification message indicating that the corresponding sensor in the sensor assembly has failed is initiated; and / or, based on the current value of the electrical parameters of the compressor, the protection threshold of the output parameters of the corresponding sensor in the sensor assembly is adjusted to achieve control and protection of the air conditioning system.

2. The control method for the air conditioning system according to claim 1, characterized in that, The electrical parameters of the compressor include at least one of the following: the DC bus voltage of the compressor, the three-phase current of the compressor; and / or, the sensor assembly includes at least one of the following: a temperature sensor, a pressure sensor; Obtaining the electrical parameters of the compressor includes: The sampled values ​​of the compressor's electrical parameters are obtained, and the average value of the sampled values ​​of the compressor's electrical parameters obtained within a set time window is used as the obtained electrical parameters of the compressor.

3. The control method for the air conditioning system according to claim 1 or 2, characterized in that, Based on the compressor's electrical parameters, determine the reference values ​​for the compressor's electrical parameters, including: The electrical parameters of the compressor obtained at the rated frequency of the compressor shall be recorded as the initial reference values ​​of the electrical parameters of the compressor. Based on the target frequency of the compressor, the initial reference values ​​of the compressor's electrical parameters are corrected to obtain corrected reference values ​​for the compressor's electrical parameters; and the corrected reference values ​​for the compressor's electrical parameters are determined as the reference values ​​for the compressor's electrical parameters.

4. The control method for the air conditioning system according to claim 3, characterized in that, Based on the target frequency of the compressor, the initial reference values ​​of the compressor's electrical parameters are corrected to obtain corrected reference values ​​for the compressor's electrical parameters, including: The difference between the target frequency and the rated frequency of the compressor is determined. The product of this difference and a set correction coefficient is then added to the initial reference value of the compressor's electrical parameters, and this sum is used as the correction reference value for the compressor's electrical parameters.

5. The control method for an air conditioning system according to any one of claims 1 to 4, characterized in that, Based on the baseline values ​​of the compressor's electrical parameters, the current values ​​of the compressor's electrical parameters, and the output parameters of the corresponding sensors in the sensor assembly, determine whether a corresponding sensor in the sensor assembly has failed, including: The electrical parameters of the compressor obtained after the air conditioning system has been running for a set time shall be recorded as the current value of the electrical parameters of the compressor. The absolute value of the difference between the current value of the compressor's electrical parameters and the reference value of the compressor's electrical parameters, and the ratio of this difference to the reference value of the compressor's electrical parameters, are determined as the degree of deviation of the current value of the compressor's electrical parameters from the reference value of the compressor's electrical parameters, and are denoted as the degree of deviation of the compressor's electrical parameters. The change value of the output parameter of the corresponding sensor in the sensor assembly within a set time period is determined and recorded as the parameter change value of the corresponding sensor in the sensor assembly; If the deviation of the electrical parameters of the compressor is determined to be greater than the minimum value of the preset deviation range, and if the parameter change value of the corresponding sensor in the sensor assembly is determined to be less than the preset change value threshold of the corresponding sensor in the sensor assembly, then the corresponding sensor in the sensor assembly is determined to be faulty.

6. The control method for an air conditioning system according to any one of claims 1 to 5, characterized in that, The preset deviation range includes: a range consisting of the minimum value of the preset deviation range, the first deviation, the second deviation, and the maximum value of the preset deviation range, which are successively increased; Based on the current values ​​of the compressor's electrical parameters, the protection threshold of the output parameters of the corresponding sensors in the sensor assembly is adjusted to achieve control and protection of the air conditioning system, including: The absolute value of the difference between the current value of the compressor's electrical parameters and the reference value of the compressor's electrical parameters, and the ratio of this difference to the reference value of the compressor's electrical parameters, are determined as the degree of deviation of the current value of the compressor's electrical parameters from the reference value of the compressor's electrical parameters, and are denoted as the degree of deviation of the compressor's electrical parameters. Determine the relationship between the degree of deviation of the electrical parameters of the compressor and the minimum value, first degree of deviation, second degree of deviation, and maximum value of the preset deviation range; If it is determined that the deviation of the electrical parameters of the compressor is greater than the minimum value of the preset deviation range and less than or equal to the first deviation, then the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a first preset ratio. If it is determined that the deviation of the electrical parameters of the compressor is greater than the first deviation and less than or equal to the second deviation, then the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a second preset ratio, the second preset ratio being greater than the first preset ratio. If it is determined that the deviation of the electrical parameters of the compressor is greater than the second deviation degree and less than or equal to the maximum value of the preset deviation degree range, then the protection threshold of the output parameter of the corresponding sensor in the sensor assembly is reduced by a third preset ratio, which is greater than the second preset ratio.

7. A control device for an air conditioning system, characterized in that, The air conditioning system includes a compressor and sensor components; the control device of the air conditioning system includes: The acquisition unit is configured to acquire the electrical parameters of the compressor and the output parameters of the corresponding sensors in the sensor assembly when the air conditioning system is running after startup. The control unit is configured to determine a reference value for the electrical parameters of the compressor based on the electrical parameters of the compressor; The control unit is further configured to determine whether a corresponding sensor in the sensor assembly is malfunctioning based on a reference value of the electrical parameters of the compressor, the current value of the electrical parameters of the compressor, and the output parameters of the corresponding sensor in the sensor assembly. The control unit is further configured to, if it is determined that a corresponding sensor in the sensor assembly has failed, initiate a notification message indicating that the corresponding sensor in the sensor assembly has failed; and / or, adjust the protection threshold of the output parameter of the corresponding sensor in the sensor assembly based on the current value of the electrical parameter of the compressor, so as to achieve control and protection of the air conditioning system.

8. An air conditioning system, characterized in that, include: The control device for the air conditioning system as described in claim 7.

9. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the air conditioning system according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the air conditioning system according to any one of claims 1 to 6.

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