Current control method and device of air conditioning system, and air conditioning system

Abstract

The application discloses a current control method and device of an air conditioning system and the air conditioning system. The method comprises the following steps: collecting operation state data of the air conditioning system; determining a current safety score of the air conditioning system according to the operation state data, wherein the current safety score is used for representing the safety of the air conditioning system under a current working condition; determining a current limiting value of the air conditioning system according to the current safety score; and adjusting the operation frequency of a compressor of the air conditioning system, so that the actual operation current of the compressor is less than or equal to the current limiting value. The application solves the technical problem that the flexibility is poor due to the mismatch between the current limiting control of the fixed maximum allowed current value and the dynamic working condition demand in the existing variable frequency air conditioner.

Description

Technical Field

[0001] This invention relates to the field of home appliance control technology, and more specifically, to a current control method and device for an air conditioning system, and an air conditioning system. Background Technology

[0002] Currently, most inverter air conditioners on the market have a "maximum allowable current value" (referred to as frequency limiting current) to prevent the mainboard from overheating or the system pressure from being too high. When the compressor's operating current reaches this value, the machine will limit the frequency from increasing further.

[0003] This "maximum allowable current value" is usually a fixed value measured by the manufacturer during the research and development phase. This raises a problem: for example, if the maximum current is set to 10A, and the weather is cool, the condenser dissipates heat well, and the mainboard temperature is low, the air conditioner is actually fully capable of handling 12A or even higher current to provide greater cooling capacity. However, because it is locked at 10A, the air conditioner can only operate within 10A, resulting in the cooling effect not being fully realized, and the user feeling that it is not cold enough. Conversely, if the weather is extremely hot and heat dissipation is poor, fixing it at 10A may be too dangerous. Therefore, using a fixed digital value to manage all operating conditions has significant limitations.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This invention provides a current control method and device for an air conditioning system, and an air conditioning system, to at least solve the technical problem of poor flexibility in existing variable frequency air conditioners due to the mismatch between current limiting control using a "fixed maximum allowable current value" and dynamic operating conditions.

[0006] According to one aspect of the present invention, a current control method for an air conditioning system is provided, comprising: collecting operating status data of the air conditioning system; determining a current safety score of the air conditioning system based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions; determining a current limiting value of the air conditioning system based on the current safety score; and adjusting the operating frequency of the compressor of the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limiting value.

[0007] Optionally, the operating status data includes: motherboard component temperature and system pipeline pressure. The collection of operating status data of the air conditioning system includes: collecting the current temperature of the motherboard power devices of the air conditioning system through a temperature sensor to obtain the motherboard component temperature; and collecting the high-pressure side pressure or low-pressure side pressure in the refrigeration pipeline of the air conditioning system through a pressure sensor to obtain the system pipeline pressure.

[0008] Optionally, collecting operating status data of the air conditioning system includes: determining the collection period for the operating status data; and collecting the operating status data according to the collection period.

[0009] Optionally, determining the current safety score of the air conditioning system based on the operating status data includes: determining the feature values ​​of the operating status data, wherein the feature values ​​are one of the following: average value, median value, and variance of the operating status data; determining the change values ​​of the operating status data based on the feature values; and determining the current safety score based on the change values ​​and a scoring rule, wherein the scoring rule is used to describe the relationship between the change values ​​and the score values.

[0010] Optionally, determining the change value of the operating status data based on the feature value includes: determining a baseline value of the operating status data; and determining the difference between the feature value and the baseline value as the change value.

[0011] Optionally, determining the current limiting value of the air conditioning system based on the current safety score includes: using the current safety score as an index to obtain the current limiting value by subtracting the value from the safety score-current limiting mapping table, wherein the safety score-current limiting mapping table is used to record the set current limiting values ​​corresponding to different safety score intervals.

[0012] Optionally, adjusting the operating frequency of the compressor in the air conditioning system to make the actual operating current of the compressor less than or equal to the current limit value includes: monitoring the actual operating current of the compressor; when the current difference between the actual operating current and the current limit value is less than a first current difference threshold, reducing the operating frequency until the actual operating current falls back to a safe range; and when the current difference is greater than a second current difference threshold, allowing the operating frequency to increase within the range where the actual operating current is less than or equal to the current limit value.

[0013] Optionally, the current control method further includes: when the current limit value changes due to a jump in the current safety score, performing a smooth transition operation according to the direction of change of the current limit value, wherein the direction of change is used to indicate the direction of change of the current limit value; wherein performing a smooth transition operation according to the direction of change of the current limit value includes: gradually increasing or gradually decreasing the current limit value at a preset rate.

[0014] According to another aspect of the present invention, a current control device for an air conditioning system is also provided, comprising: a data acquisition unit for acquiring operating status data of the air conditioning system; a first determination unit for determining a current safety score of the air conditioning system based on the operating status data, wherein the current safety score characterizes the safety of the air conditioning system under current operating conditions; a second determination unit for determining a current limiting value of the air conditioning system based on the current safety score; and an adjustment unit for adjusting the operating frequency of the compressor of the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limiting value.

[0015] Optionally, the operating status data includes: motherboard component temperature and system pipeline pressure. The acquisition unit includes: a first acquisition module, used to acquire the current temperature of the motherboard power devices of the air conditioning system through a temperature sensor to obtain the motherboard component temperature; and a second acquisition module, used to acquire the high-pressure side pressure or low-pressure side pressure in the refrigeration pipeline of the air conditioning system through a pressure sensor to obtain the system pipeline pressure.

[0016] Optionally, the acquisition unit includes: a first determining module, configured to determine the acquisition period of the operating status data; and an acquisition module, configured to acquire the operating status data according to the acquisition period.

[0017] Optionally, the first determining unit includes: a second determining module, configured to determine a feature value of the operating status data, wherein the feature value is one of the following of the operating status data: average value, median value, variance; a third determining module, configured to determine a change value of the operating status data based on the feature value; and a fourth determining module, configured to determine the current safety score based on the change value and a scoring rule, wherein the scoring rule describes the relationship between the change value and the score value.

[0018] Optionally, the third determining module includes: a first determining submodule, used to determine a baseline value for the operating status data; and a second determining submodule, used to determine the difference between the feature value and the baseline value as the change value.

[0019] Optionally, the second determining unit includes: a third obtaining module, used to obtain the rate limiting value by subtracting the current security score from the security score-rate limiting mapping table, wherein the security score-rate limiting mapping table is used to record the set rate limiting values ​​corresponding to different security score intervals.

[0020] Optionally, the adjustment unit includes: a monitoring module for monitoring the actual operating current of the compressor; a reduction module for reducing the operating frequency when the current difference between the actual operating current and the current limit value is less than a first current difference threshold, until the actual operating current falls back to a safe range; and an increase module for allowing the operating frequency to increase when the current difference is greater than a second current difference threshold, provided that the actual operating current is less than or equal to the current limit value.

[0021] Optionally, the current control device further includes: an execution unit, configured to perform a smooth transition operation according to the direction of change of the current limit value when the current safety score changes and causes the current limit value to change, wherein the direction of change is used to indicate the direction of change of the current limit value; wherein the execution unit includes: a processing module, configured to gradually increase or gradually decrease the current limit value at a preset rate.

[0022] According to another aspect of the present invention, an air conditioning system is also provided, wherein the air conditioning system uses the current control method of the air conditioning system described in any one of the above embodiments.

[0023] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes the current control method of the air conditioning system described in any one of the above embodiments.

[0024] According to another aspect of the present invention, a processor is also provided, the processor being configured to run a program, wherein the program, when running, executes the current control method for the air conditioning system described in any of the above embodiments.

[0025] According to another aspect of the present invention, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform the current control method of the air conditioning system described in any one of the above embodiments.

[0026] In this embodiment of the invention, operating status data of the air conditioning system is collected; the current safety score of the air conditioning system is determined based on the operating status data, wherein the current safety score characterizes the safety of the air conditioning system under the current operating conditions; the current limit value of the air conditioning system is determined based on the current safety score; and the operating frequency of the compressor of the air conditioning system is adjusted so that the actual operating current of the compressor is less than or equal to the current limit value. A dynamic "safety score" mechanism is constructed by real-time monitoring of the air conditioning system (such as the temperature of motherboard components and the pressure of system pipelines). When the system has good heat dissipation and a low motherboard temperature, indicating a high safety margin, the upper limit of the current limit is automatically relaxed (e.g., increased from a fixed 10A to 12A), allowing the compressor to operate at a higher frequency, thereby maximizing the output of cooling / heating capacity. This solves the problem in existing technologies where a fixed, "one-size-fits-all" current limit prevents the air conditioner from achieving its maximum performance when there is sufficient safety margin, thus improving the user's comfort experience. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a hardware structure block diagram of a mobile terminal for a current control method of an air conditioning system according to an embodiment of the present invention.

[0029] Figure 2 This is a flowchart of a current control method for an air conditioning system according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of an air conditioning system according to an embodiment of the present invention;

[0031] Figure 4 This is a flowchart of an optional current control method for an air conditioning system according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of an energy-saving control device for a water heater according to an embodiment of the present invention.

[0033] The above figures include the following reference numerals:

[0034] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] As described in the background section, existing variable frequency air conditioners suffer from poor flexibility due to the mismatch between current limiting control using a "fixed maximum allowable current value" and dynamic operating conditions. This invention provides a current control method and apparatus for an air conditioning system, an air conditioning system, a computer-readable storage medium, a processor, and a computer program product.

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] The methods and embodiments provided in this invention can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a current control method of an air conditioning system according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0040] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the current control method of the air conditioning system in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one instance, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0041] Example 1

[0042] According to an embodiment of the present invention, a method embodiment of a current control method for an air conditioning system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0043] Figure 2 This is a flowchart of a current control method for an air conditioning system according to an embodiment of the present invention, such as... Figure 2 As shown, the method includes the following steps:

[0044] Step S202: Collect the operating status data of the air conditioning system.

[0045] Optionally, the aforementioned operating status data may include, but is not limited to, motherboard component temperatures and system pipeline pressures. In this embodiment of the invention, motherboard component temperatures and system pipeline pressures are used as examples for illustration.

[0046] Specifically, the motherboard of the air conditioning system is equipped with a temperature sensor (such as an NTC thermistor or a digital temperature sensor), which is attached to the surface of the IGBT module or the main control chip to monitor the temperature of key components on the motherboard in real time. Figure 3 This is a schematic diagram of an air conditioning system according to an embodiment of the present invention, such as... Figure 3 As shown, the air conditioner mainboard controller contains a mainboard temperature sensor and a current transformer (not shown in the figure) to monitor the temperature of power devices such as IGBTs (Insulated Gate Bipolar Transistors). The air conditioner piping contains high-pressure / low-pressure sensors to monitor the system pressure. Figure 3 The pressure sensor is installed on the pipeline between the compressor and the condenser. Additionally, a throttling device is installed between the condenser and the evaporator.

[0047] Meanwhile, the air conditioning piping is equipped with a high-pressure sensor and a low-pressure sensor, which are installed between the compressor exhaust port and the condenser inlet (high-pressure side) and between the compressor suction port and the evaporator outlet (low-pressure side), respectively, to monitor the pressure of the refrigeration system in real time.

[0048] The controller periodically collects the above data at preset time intervals (e.g., 10ms). To improve data stability and eliminate transient noise interference, the controller performs an arithmetic average of the temperature and pressure values ​​collected in the most recent N times (e.g., N=10 times, i.e., within the most recent 100ms) to obtain the system temperature T and system pressure P at the current moment.

[0049] Step S204: Determine the current safety score of the air conditioning system based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions.

[0050] In this embodiment, the controller runs a scoring algorithm, inputs the collected temperature and pressure values, and deducts the corresponding points from the full score (e.g., 100 points) according to the preset deduction rules (e.g., deduct 5 points for every 1 degree Celsius increase in temperature and 10 points for every 0.1 MPa increase in pressure) to obtain the current safety score F.

[0051] Step S206: Determine the flow limit value of the air conditioning system based on the current safety score.

[0052] In this embodiment, the controller can read a pre-stored "safety score-current limit mapping table". For example, a score of 90-100 corresponds to a 12A current limit, 70-90 corresponds to a 10A current limit, and 50-70 corresponds to an 8.5A current limit. The current target current limit value (i.e., the current limit value) I_limit is obtained by looking up the table based on the current score F.

[0053] Step S208: Adjust the operating frequency of the compressor in the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limit value.

[0054] In this embodiment, the controller monitors the actual operating current of the compressor. If the actual operating current is close to or exceeds the current limit, the compressor drive frequency is reduced to reduce the current. Conversely, if the actual operating current is much lower than the current limit, the operating frequency is increased to increase the cooling capacity under safe conditions.

[0055] As described above, in this embodiment of the invention, the operating status data of the air conditioning system can be collected; the current safety score of the air conditioning system can be determined based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions; the current limit value of the air conditioning system can be determined based on the current safety score; the operating frequency of the compressor of the air conditioning system can be adjusted so that the actual operating current of the compressor is less than or equal to the current limit value. Here, by establishing a nonlinear mapping relationship between the safety score and the current limit, the control strategy is dynamically adaptive according to the operating conditions: the safer the system (higher score), the higher the allowed current limit, and the compressor can output more power; the higher the system risk (lower score), the lower the current limit, and the system is forced to reduce the frequency to protect itself. Under comfortable operating conditions with good heat dissipation and low temperature, the safety score is high, allowing a higher current limit (such as 12A), enabling the air conditioner to exert its maximum cooling / heating capacity and solving the problem of "overkill" or performance waste caused by traditional fixed current limiting; under high temperature, high load or poor heat dissipation conditions, the safety score decreases, and the current limit is automatically tightened (such as reduced to 8A), effectively preventing the main board from overheating and burning out or the pipeline from bursting due to excessive pressure, thus improving the robustness of the system.

[0056] Therefore, the technical solution provided by the above embodiments of the present invention solves the technical problem of poor flexibility in existing variable frequency air conditioners due to the mismatch between current limiting control using a "fixed maximum allowable current value" and dynamic operating conditions.

[0057] According to the above embodiments of the present invention, the operating status data includes: motherboard component temperature and system pipeline pressure. The collection of operating status data of the air conditioning system includes: collecting the current temperature of the motherboard power devices of the air conditioning system through a temperature sensor to obtain the motherboard component temperature; and collecting the high-pressure side pressure or low-pressure side pressure in the refrigeration pipeline of the air conditioning system through a pressure sensor to obtain the system pipeline pressure.

[0058] In this embodiment, for temperature monitoring points, an NTC thermistor or digital temperature sensor is installed near the IGBT module or main control MCU on the air conditioner outdoor unit's main board, close to the heat source, to monitor the junction temperature or surface temperature of the power devices in real time. For pressure monitoring points: High-pressure side: A high-pressure sensor is installed on the copper pipe between the compressor discharge port and the condenser inlet to monitor the condensing pressure; Low-pressure side (optional): A low-pressure sensor is installed between the compressor suction port and the evaporator outlet to monitor the evaporating pressure.

[0059] The temperature of the mainboard components (especially IGBTs) directly determines the thermal stress life and reliability of electronic components; while system pressure directly reflects the refrigerant circulation status and the heat exchange efficiency of the heat exchangers (condenser / evaporator). Excessively high pressure usually indicates poor condenser heat dissipation (such as fan failure or blockage), while abnormally low pressure may indicate refrigerant leakage or blockage. Selecting these two key physical quantities can comprehensively and accurately reflect the "health status" of the air conditioning system.

[0060] This approach combines electrical thermal risks (temperature) and mechanical / thermodynamic risks (pressure), avoiding the limitations of assessments based on a single indicator. For example, even at normal temperatures, if the pressure rises abnormally, the system still faces the risk of bursting, necessitating current limitation.

[0061] According to the above embodiments of the present invention, collecting operating status data of an air conditioning system includes: determining the collection period for operating status data; and collecting operating status data according to the collection period.

[0062] In this example, the controller sets a fixed sampling interval (e.g., 10ms or 50ms) via timer interrupts or RTOS task scheduling. At the end of each sampling cycle, the ADC is triggered to read the values ​​from the temperature and pressure sensors and store them in a circular buffer.

[0063] Figure 4 This is a flowchart of an optional current control method for an air conditioning system according to an embodiment of the present invention, such as... Figure 4 As shown, data acquisition and cleaning are required first: the controller acquires data every 10ms. To eliminate interference, the average of the most recent 10 acquired temperature and pressure values ​​is taken to obtain the current temperature T and current pressure P.

[0064] Real-time control systems require timely data processing. Excessively long acquisition cycles lead to control lag and an inability to respond promptly to transient faults; conversely, excessively short cycles increase the MCU load and introduce more high-frequency noise. Setting a fixed acquisition cycle ensures the regularity and predictability of data acquisition, providing a time reference for subsequent data filtering and scoring calculations.

[0065] This technical solution ensures that the controller can promptly capture rapid changes in system status (such as large current surges during startup), preventing overcurrent damage caused by response delays. Furthermore, the standardized data acquisition process facilitates modular software design, simplifying debugging and maintenance.

[0066] According to the above embodiments of the present invention, determining the current safety score of an air conditioning system based on operating status data includes: determining feature values ​​of the operating status data, wherein the feature values ​​are one of the following: average value, median value, and variance of the operating status data; determining the change values ​​of the operating status data based on the feature values; and determining the current safety score based on the change values ​​and scoring rules, wherein the scoring rules are used to describe the relationship between the change values ​​and the score values.

[0067] In this embodiment, the controller initializes the safety score to a preset initial safety score value. The controller compares the current system temperature with a benchmark safe temperature threshold. If the current system temperature is higher than the benchmark safe temperature threshold, the controller calculates the temperature difference and multiplies it by a temperature deduction coefficient to obtain a temperature deduction item. The controller compares the current system pressure with a benchmark safe pressure threshold. If the current system pressure is higher than the benchmark safe pressure threshold, the controller calculates the pressure difference and multiplies it by a pressure deduction coefficient to obtain a pressure deduction item. The controller subtracts the temperature deduction item and the pressure deduction item from the preset initial safety score value to obtain a preliminary safety score. If the preliminary safety score is less than zero, the safety score is reset to zero. If the preliminary score is greater than the preset maximum safety score, the safety score is reset to the maximum score.

[0068] Here, to eliminate transient noise, the controller does not directly use a single sample value. Instead, it calculates the arithmetic mean of the most recent N sample points (e.g., N=10) as the feature value at the current moment. Alternatively, the data collected within the data acquisition window is arranged sequentially, and in scenarios with extremely high anti-interference requirements, the median value is taken to remove abnormal spikes. The difference between the obtained feature value and the preset benchmark value is calculated to obtain the change value, which is then used to determine the current safety score.

[0069] For example, a safety score F can be defined (out of 100 points, the higher the score, the safer). The initial score is 100 points. If an increase in temperature T is detected, corresponding points are deducted; if an increase in pressure P is detected, corresponding points are also deducted. For example, the baseline safe temperature is set at 60℃, and the baseline safe pressure is 3.0MPa. If the current temperature is 70℃, exceeding it by 10℃, 5 points are deducted for every 1℃ exceeding the limit; if the current pressure is 3.5MPa, exceeding it by 0.5MPa, 10 points are deducted for every 0.1MPa exceeding the limit.

[0070] The final score F = 100 - (temperature deduction) - (pressure deduction). If the calculated score is less than 0, it is counted as 0. Where, for example... Figure 4As shown, the maximum score is 100 points, and the higher the score, the safer it is.

[0071] The 60℃ reference is based on the derating design guidelines for the motherboard power devices (IGBT / rectifier bridge). Typically, power devices are allowed a junction temperature of 110-125℃. After subtracting thermal resistance temperature rise and margin, 60℃ is taken as the safety benchmark to ensure long-term reliable operation. 3.0MPa is the saturation pressure (high-pressure side) corresponding to an R32 / R410A refrigeration system at a condensing temperature of approximately 55℃, representing a typical safe upper limit within the compressor's operating envelope.

[0072] This method effectively suppresses false alarms caused by sensor noise and power grid fluctuations by processing eigenvalues ​​(such as average values), preventing safety scores from jumping drastically due to minor fluctuations.

[0073] According to the above embodiments of the present invention, determining the change value of the operating status data based on the feature value includes: determining the baseline value of the operating status data; and determining the difference between the feature value and the baseline value as the change value.

[0074] In this embodiment, a reference value can be set, for example, 60℃ (the upper limit of the safe junction temperature of the IGBT) and 3.0MPa (the upper limit of the safe operating pressure on the high-voltage side). If the temperature characteristic value is greater than 60℃, the temperature deviation is the characteristic value - 60; if the pressure characteristic value is greater than 3.0MPa, the pressure deviation is the pressure characteristic value - 3.0. If the reference value is not exceeded, the deviation is 0.

[0075] By setting specific benchmark values, the safety score has a clear physical meaning. Points are only deducted when the system actually "exceeds the limit," avoiding unnecessary restrictions under normal operating conditions.

[0076] According to the above embodiments of the present invention, determining the current limiting value of the air conditioning system based on the current safety score includes: using the current safety score as an index to obtain the current limiting value by subtracting the current value from the safety score-current limiting mapping table, wherein the safety score-current limiting mapping table is used to record the set current limiting values ​​corresponding to different safety score intervals.

[0077] In this embodiment, a lookup table is used to implement the nonlinear mapping. Compared to complex real-time calculation formulas, the lookup table method has low computational complexity and high speed, making it suitable for resource-constrained embedded MCUs. By setting different intervals, piecewise linear or stepped current limiting strategies can be implemented. It should be noted that this can also be achieved in other ways; for example, a prediction model can be pre-trained, and the current limiting value can be predicted based on the current security score.

[0078] like Figure 4 As shown, a pre-set table (or curve equation) can be stored inside the controller, which specifies the "maximum allowable current" corresponding to different "safety scores".

[0079] That is, to determine the upper limit of current by looking up a table, a pre-set table (or curve equation) can be stored inside the controller, which specifies the "maximum allowable current" corresponding to different "safety scores". The format of this table can be: |Safety score range|System state description|Maximum allowable current (A)|Action description|, for example, |90-100 points|Extremely safe|12.0A|Full output, no speed limit|; |70-90 points|Relatively safe|10.0A|Normal limit|; |50-70 points|Caution: risk|8.5A|Early warning, slight frequency reduction|; The controller looks up the current target current limit value I_limit in the table based on the safety score F calculated in the second step.

[0080] According to the above embodiments of the present invention, adjusting the operating frequency of the compressor of the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limit value includes: monitoring the actual operating current of the compressor; when the current difference between the actual operating current and the current limit value is less than a first current difference threshold, reducing the operating frequency until the actual operating current falls back to a safe range; when the current difference is greater than a second current difference threshold, allowing the operating frequency to increase within the range where the actual operating current is less than or equal to the current limit value.

[0081] Here, the controller reads the preset safety score and maximum allowable current mapping table, matches the corresponding maximum allowable current value according to the score range in which the current safety score value is located, and obtains the current target maximum allowable current limit value; the controller compares the current target maximum allowable current limit value with the historical maximum allowable current limit value of the previous control cycle; if the two are not equal, a step-type or ramp-type adjustment process is triggered; if the two are equal, the current maximum allowable current limit value is kept unchanged.

[0082] In this embodiment, a first threshold ΔI1 = 2.0A can be set. If Ilimit - Ireal < 2.0A, it indicates that the current is close to the upper limit, and the controller reduces the frequency in fixed steps (e.g., 5Hz) until Ireal is significantly lower than Ilimit. Simultaneously, a second threshold ΔI2 = 4.0A can be set. If Ilimit - Ireal > 4.0A, it indicates that the current is much lower than the upper limit, with a large margin, and the controller increases the frequency in smaller steps (e.g., 2Hz) to increase the cooling capacity until ΔI < 4.0A.

[0083] Two distinct thresholds (ΔI1 and ΔI2) are introduced to form two boundaries. Action A is executed only when the state crosses the upper boundary, and action B is executed only when it crosses the lower boundary. This prevents frequent oscillations of the actuator (compressor frequency) near the critical point, avoids frequent rises and falls of the compressor frequency near the critical value, and reduces mechanical wear and noise fluctuations.

[0084] According to the above embodiments of the present invention, the current control method further includes: when a change in the current limit value is caused by a jump in the current safety score, performing a smooth transition operation according to the direction of change of the current limit value, wherein the direction of change is used to indicate the direction of change of the current limit value; wherein performing a smooth transition operation according to the direction of change of the current limit value includes: gradually increasing or gradually decreasing the current limit value at a preset rate.

[0085] In this embodiment, if adjustment is indicated, the controller calculates the difference between the current target maximum allowable current limit and the historical maximum allowable current limit. Based on a preset current change rate threshold, the controller calculates the maximum allowable current change within a preset time interval. If the absolute value of the difference is greater than the maximum allowable current change, the controller increases or decreases the historical maximum allowable current limit by this amount to obtain a new intermediate current limit. If the absolute value of the difference is less than or equal to the maximum allowable current change, the controller directly uses the current target maximum allowable current limit as the new intermediate current limit. Subsequently, the controller updates the new intermediate current limit to the historical maximum allowable current limit for use in the next cycle. If no adjustment is indicated, the historical maximum allowable current limit remains unchanged.

[0086] For example, such as Figure 4 As shown, in actual control, if the safety score was 85 points (current limit 10A) in the previous second and it becomes 88 points (current limit 12A) in this second, the controller will not immediately pull the current to 12A. Instead, there will be a ramp-up process, increasing the current by 0.5A per second to avoid sudden current surges impacting the power grid or compressor. Similarly, if the score drops from 85 points to 82 points, the current limit will decrease from 10A to 9A, also gradually.

[0087] In this embodiment of the invention, the controller monitors the real-time operating current value of the compressor; the controller compares the real-time operating current value with the final current limit threshold; if the real-time operating current value is less than or equal to the final current limit threshold, the controller maintains the current operating frequency of the compressor or allows the frequency to increase; if the real-time operating current value is greater than the final current limit threshold, the controller adjusts the strategy coefficient according to the preset frequency to reduce the operating frequency of the compressor until the real-time operating current value falls back below the final current limit threshold; the controller outputs the adjusted compressor operating frequency to the compressor drive module.

[0088] like Figure 4 As shown, the actual operating current of the compressor must always be less than or equal to this target current limit value I_limit. If the real-time current approaches I_limit, the controller will reduce the compressor frequency until the current drops back down. This ensures that the current never exceeds the safety limits under the current operating conditions, while maximizing the output of cooling capacity within the safe range, thus achieving closed-loop control.

[0089] As described above, in this embodiment of the invention, the temperature of motherboard components and system pressure are collected in real time. After data cleaning, a safety score reflecting the system's safety level is calculated. Based on this safety score, a preset mapping table is consulted to determine the current maximum allowable current limit. Closed-loop control is executed to ensure that the compressor's operating current does not exceed this limit, and the current limit is smoothly adjusted using a ramp-like transition when the safety score changes. This solution dynamically adjusts the current limit, relaxing restrictions to improve cooling performance when the system has sufficient safety margin, and tightening restrictions to protect the system when the risk is high. This solves the problem of performance waste or insufficient protection caused by fixed current limits, achieving a balance between performance and safety.

[0090] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0091] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0092] Example 2

[0093] According to an embodiment of the present invention, an energy-saving control device for a water heater for implementing the above-described energy-saving control method for a water heater is also provided. Figure 5 This is a schematic diagram of an energy-saving control device for a water heater according to an embodiment of the present invention, such as... Figure 5 As shown, the device includes: a data acquisition unit 501, a first determination unit 503, a second determination unit 505, and an adjustment unit 507. The device will be described below.

[0094] The data acquisition unit 501 is used to collect the operating status data of the air conditioning system.

[0095] The first determining unit 503 is used to determine the current safety score of the air conditioning system based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions.

[0096] The second determining unit 505 is used to determine the flow limit value of the air conditioning system based on the current safety score.

[0097] The adjustment unit 507 is used to adjust the operating frequency of the compressor in the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limit value.

[0098] It should be noted that the above-mentioned acquisition unit 501, first determination unit 503, second determination unit 505 and adjustment unit 507 correspond to steps S202 to S208 in the above embodiments. The four units and the corresponding steps implement the same instances and application scenarios, but are not limited to the content disclosed in the above embodiments.

[0099] As can be seen from the above, in the scheme described in the above embodiments of the present invention, the acquisition unit can collect the operating status data of the air conditioning system; the first determining unit can determine the current safety score of the air conditioning system based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions; the second determining unit can determine the current limiting value of the air conditioning system based on the current safety score; and the adjusting unit can adjust the operating frequency of the compressor of the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limiting value. Here, by establishing a nonlinear mapping relationship between the safety score and the current limit, the control strategy is dynamically adaptive according to the operating conditions: the safer the system (higher score), the higher the allowable current limit, and the compressor can output more power; the higher the system risk (lower score), the lower the current limit, and the forced frequency reduction protection system. Under comfortable operating conditions with good heat dissipation and low temperature, the safety score is high, allowing for a higher current limit (such as 12A), enabling the air conditioner to exert its maximum cooling / heating capacity and solving the problem of "overkill" or performance waste caused by traditional fixed current limiting. Under operating conditions with high temperature, high load or poor heat dissipation, the safety score decreases and the current limit is automatically tightened (such as reduced to 8A), effectively preventing the mainboard from overheating and burning out or the pipeline from bursting due to excessive pressure, thus improving the robustness of the system.

[0100] Therefore, the technical solution provided by the above embodiments of the present invention solves the technical problem of poor flexibility in existing variable frequency air conditioners due to the mismatch between current limiting control using a "fixed maximum allowable current value" and dynamic operating conditions.

[0101] Optionally, the operating status data includes: motherboard component temperature and system pipeline pressure. The acquisition unit includes: a first acquisition module, used to acquire the current temperature of the motherboard power devices of the air conditioning system through a temperature sensor to obtain the motherboard component temperature; and a second acquisition module, used to acquire the high-pressure side pressure or low-pressure side pressure in the refrigeration pipeline of the air conditioning system through a pressure sensor to obtain the system pipeline pressure.

[0102] Optionally, the acquisition unit includes: a first determining module for determining the acquisition period of the operating status data; and an acquisition module for acquiring the operating status data according to the acquisition period.

[0103] Optionally, the first determining unit includes: a second determining module for determining feature values ​​of the operating status data, wherein the feature values ​​are one of the following of the operating status data: average value, median value, and variance; a third determining module for determining change values ​​of the operating status data based on the feature values; and a fourth determining module for determining the current safety score based on the change values ​​and scoring rules, wherein the scoring rules are used to describe the relationship between the change values ​​and the score values.

[0104] Optionally, the third determining module includes: a first determining submodule for determining a baseline value of the operating status data; and a second determining submodule for determining the difference between the feature value and the baseline value as a change value.

[0105] Optionally, the second determining unit includes: a third obtaining module, used to obtain the rate limiting value by using the current security score as an index to differ from the security score-rate limiting mapping table, wherein the security score-rate limiting mapping table is used to record the set rate limiting values ​​corresponding to different security score intervals.

[0106] Optionally, the adjustment unit includes: a monitoring module for monitoring the actual operating current of the compressor; a reduction module for reducing the operating frequency when the current difference between the actual operating current and the current limit value is less than a first current difference threshold, until the actual operating current falls back to a safe range; and an increase module for allowing the operating frequency to increase when the current difference is greater than a second current difference threshold, provided that the actual operating current is less than or equal to the current limit value.

[0107] Optionally, the current control device further includes: an execution unit, configured to perform a smooth transition operation according to the direction of change of the current limit value when the current safety score changes and causes a change in the current limit value, wherein the direction of change is used to indicate the direction of change of the current limit value; wherein the execution unit includes: a processing module, configured to gradually increase or decrease the current limit value at a preset rate.

[0108] According to another aspect of the present invention, an air conditioning system is also provided, wherein the air conditioning system uses the current control method of any of the above-described air conditioning systems.

[0109] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes the current control method of the air conditioning system described above.

[0110] According to another aspect of the present invention, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform the current control method of an air conditioning system as described above.

[0111] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes the current control method of the air conditioning system described above.

[0112] Optionally, in this embodiment, the computer-readable storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any communication device in a group of communication devices.

[0113] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: collecting operating status data of the air conditioning system; determining the current safety score of the air conditioning system based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions; determining the current limiting value of the air conditioning system based on the current safety score; and adjusting the operating frequency of the compressor of the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limiting value.

[0114] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: acquiring the current temperature of the mainboard power devices of the air conditioning system through a temperature sensor to obtain the mainboard component temperature; acquiring the high-pressure side pressure or low-pressure side pressure in the refrigeration pipeline of the air conditioning system through a pressure sensor to obtain the system pipeline pressure.

[0115] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: determining the acquisition period of the running status data; and acquiring the running status data according to the acquisition period.

[0116] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: determining feature values ​​of operating status data, wherein the feature values ​​are one of the following of the operating status data: average value, median value, variance; determining change values ​​of the operating status data based on the feature values; and determining a current security score based on the change values ​​and a scoring rule, wherein the scoring rule is used to describe the relationship between the change values ​​and the score values.

[0117] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: determining a baseline value for operating status data; determining the difference between the feature value and the baseline value as a change value.

[0118] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining a rate limiting value by subtracting the current security score from the security score-rate limiting mapping table, wherein the security score-rate limiting mapping table is used to record the set rate limiting values ​​corresponding to different security score intervals.

[0119] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: monitoring the actual operating current of the compressor; when the current difference between the actual operating current and the current limit value is less than a first current difference threshold, reducing the operating frequency until the actual operating current falls back to a safe range; when the current difference is greater than a second current difference threshold, allowing the operating frequency to increase within the range where the actual operating current is less than or equal to the current limit value.

[0120] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when a change in the current security score causes a change in the rate limit value, a smooth transition operation is performed according to the direction of change of the rate limit value, wherein the direction of change is used to indicate the direction of change of the rate limit value; wherein performing the smooth transition operation according to the direction of change of the rate limit value includes: gradually increasing or gradually decreasing the rate limit value at a preset rate.

[0121] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0122] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0123] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0124] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0126] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0127] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0128] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A current control method for an air conditioning system, characterized in that, include: Collect operating status data of the air conditioning system; The current safety score of the air conditioning system is determined based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions; The current limiting value of the air conditioning system is determined based on the current safety score. The operating frequency of the compressor in the air conditioning system is adjusted so that the actual operating current of the compressor is less than or equal to the current limiting value.

2. The current control method for an air conditioning system according to claim 1, characterized in that, The operational status data includes: motherboard component temperatures and system piping pressures. The operational status data of the air conditioning system includes: The current temperature of the mainboard power devices of the air conditioning system is collected by a temperature sensor to obtain the temperature of the mainboard components. The system pipeline pressure is obtained by collecting the high-pressure side pressure or low-pressure side pressure in the refrigeration pipeline of the air conditioning system using a pressure sensor.

3. The current control method for an air conditioning system according to claim 1, characterized in that, Collect operating status data of the air conditioning system, including: Determine the collection cycle for the operational status data; The operational status data is collected according to the stated collection cycle.

4. The current control method for an air conditioning system according to claim 1, characterized in that, The current safety score of the air conditioning system is determined based on the operational status data, including: Determine the feature values ​​of the operating status data, wherein the feature values ​​are one of the following of the operating status data: mean, median, variance; The change value of the operating status data is determined based on the characteristic value; The current security score is determined based on the change value and the scoring rules, wherein the scoring rules are used to describe the relationship between the change value and the score value.

5. The current control method for an air conditioning system according to claim 4, characterized in that, Determining the change value of the operating status data based on the feature value includes: Determine the baseline value of the operating status data; The difference between the feature value and the benchmark value is determined as the change value.

6. The current control method for an air conditioning system according to claim 1, characterized in that, The current limiting value of the air conditioning system is determined based on the current safety score, including: The current security score is used as an index to obtain the rate limiting value by subtracting the value from the security score-rate limiting mapping table. The security score-rate limiting mapping table is used to record the set rate limiting values ​​corresponding to different security score intervals.

7. The current control method for an air conditioning system according to claim 1, characterized in that, Adjusting the operating frequency of the compressor in the air conditioning system to ensure that the actual operating current of the compressor is less than or equal to the current limiting value includes: Monitor the actual operating current of the compressor; When the difference between the actual operating current and the current limit value is less than the first current difference threshold, the operating frequency is reduced until the actual operating current falls back to a safe range. When the current difference is greater than the second current difference threshold, the operating frequency is allowed to increase within the range where the actual operating current is less than or equal to the current limiting value.

8. The current control method for an air conditioning system according to any one of claims 1 to 7, characterized in that, The current control method further includes: When the current security score changes abruptly, causing the current limiting value to change, a smooth transition operation is performed according to the direction of change of the current limiting value, wherein the direction of change is used to indicate the direction of change of the current limiting value; The smooth transition operation based on the direction of change of the current limiting value includes: gradually increasing or gradually decreasing the current limiting value at a preset rate.

9. A current control device for an air conditioning system, characterized in that, include: The data acquisition unit is used to collect operating status data of the air conditioning system. The first determining unit is used to determine the current safety score of the air conditioning system based on the operating status data, wherein the current safety score is used to characterize the safety of the air conditioning system under the current operating conditions; The second determining unit is used to determine the current limiting value of the air conditioning system based on the current safety score; The adjustment unit is used to adjust the operating frequency of the compressor of the air conditioning system so that the actual operating current of the compressor is less than or equal to the current limiting value.

10. An air conditioning system, characterized in that, The air conditioning system uses the current control method of any one of claims 1 to 8.

Images