Valve opening pulse determination method, air conditioner control method, device, equipment and air conditioner

Abstract

The application discloses a valve opening pulse determination method, an air conditioner control method and device, equipment and an air conditioner, and belongs to the air conditioner field. When any indoor unit stops, the number of steps of an electronic expansion valve corresponding to the stopped indoor unit is controlled to be a preset number of steps, so that refrigerant can flow through the stopped indoor unit. Then, the number of steps of the electronic expansion valve is controlled to decrease at a preset rate, and the exhaust temperature and the liquid valve temperature of the indoor unit are obtained during the decreasing process. When the exhaust temperature and the liquid valve temperature are maximum, the number of steps of the electronic expansion valve is a valve opening pulse. According to the application, the number of steps of the electronic expansion valve of the stopped indoor unit is controlled, so that the valve opening pulse of the electronic expansion valve of the stopped indoor unit can be accurately obtained. The valve opening pulse obtained at this time is a specific value instead of a range value, and the accuracy of control can be ensured.

Description

Technical Field

[0001] This application relates to the field of air conditioning, and in particular to a method for determining valve opening pulse, an air conditioning control method, an apparatus, equipment, and an air conditioner. Background Technology

[0002] As an essential component of air conditioning systems, the electronic expansion valve regulates the refrigerant flow through the indoor unit. However, with increasing demands for precise cooling and heating, users have strict requirements regarding the number of steps required from the electronic expansion valve. Specifically, the valve's opening pulse needs to be accurately determined. However, existing electronic expansion valves only provide a limited range of opening pulses, making accurate control impossible. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, this application provides a valve opening pulse determination method, air conditioning control method, device, equipment and air conditioner, to solve the problem that the valve opening pulse of the existing electronic expansion valve is all within a range, which makes it impossible to achieve the purpose of accurate control.

[0004] The technical solution adopted by this application to solve its technical problem is:

[0005] Firstly, a method for determining the opening pulse of an electronic expansion valve is provided, including:

[0006] When a shutdown signal is received from any indoor unit, the electronic expansion valve corresponding to that indoor unit is controlled to a preset number of steps. When the electronic expansion valve reaches the preset number of steps, the refrigerant can pass through the electronic expansion valve.

[0007] The electronic expansion valve is controlled to decrease at a preset rate, and the exhaust temperature and the liquid valve temperature of the indoor unit are obtained.

[0008] If the difference between the exhaust temperature and the liquid valve temperature is the largest and remains unchanged for a preset duration, then the electronic expansion valve step number corresponding to the earliest time when the difference is the largest is taken as the valve opening pulse.

[0009] Furthermore, it also includes:

[0010] Once an opening pulse is obtained, the number of steps of the electronic expansion valve is reset to the preset number of steps, and the electronic expansion valve is controlled to decrease at the preset rate until the preset number of opening pulses are obtained.

[0011] Sum all the valve opening pulses and calculate the first average value. Use the first average value as the final valve opening pulse.

[0012] Furthermore, it also includes:

[0013] Delete valve opening pulses whose absolute value of the difference from the first average value is greater than a preset value;

[0014] The remaining valve opening pulses are summed and the second average value is calculated. This second average value is then used as the final valve opening pulse.

[0015] Furthermore, the preset number of steps is the maximum value of the valve opening pulse range.

[0016] Secondly, an air conditioning control method is provided, applied to a multi-unit air conditioning system: the method includes:

[0017] When a shutdown signal is received from any indoor unit, the electronic expansion valve of the indoor unit is controlled by an opening pulse, which is determined by the method described above.

[0018] When the valve opening pulse runs for a preset duration, the electronic expansion valve step count is increased by a preset value.

[0019] Thirdly, an electronic expansion valve opening pulse determination device is provided, comprising:

[0020] The preset step control module is used to control the electronic expansion valve of the indoor unit to a preset step number when a stop signal is received from any indoor unit. When the electronic expansion valve reaches the preset step number, the refrigerant can pass through the electronic expansion valve.

[0021] The step reduction module is used to control the electronic expansion valve to reduce the number of steps at a preset rate, and to obtain the exhaust temperature and the liquid valve temperature of the indoor unit.

[0022] The valve opening pulse acquisition module is used to take the electronic expansion valve step number corresponding to the earliest time when the difference between the exhaust temperature and the liquid valve temperature is the largest and remains unchanged for a preset duration as the valve opening pulse.

[0023] Fourthly, an air conditioning control device is provided for use in multi-split air conditioning units: the device includes:

[0024] A step control module is used to control the electronic expansion valve of the indoor unit to open the valve pulse when a stop signal is received from any indoor unit, wherein the opening valve pulse is determined by the method according to any one of claims 1-4;

[0025] The step increment module is used to control the electronic expansion valve to increase the step count by a preset value when the valve opening pulse is running for a preset duration.

[0026] Fifthly, an electronic device is provided, comprising:

[0027] At least one processor and at least one memory;

[0028] The memory stores the executable instructions of the processor;

[0029] The processor is configured to perform the above-described method for determining the opening pulse of an electronic expansion valve.

[0030] Sixthly, an electronic device is provided, comprising:

[0031] At least one processor and at least one memory;

[0032] The memory stores the executable instructions of the processor;

[0033] The processor is configured to execute the air conditioning control method described above.

[0034] Seventhly, an air conditioner is provided that applies the above-described method for determining the opening pulse of the electronic expansion valve or the above-described air conditioner control method.

[0035] Beneficial effects:

[0036] This application provides a method for determining the valve opening pulse, an air conditioning control method, device, equipment, and air conditioner. When any indoor unit stops, the electronic expansion valve corresponding to the stopped indoor unit is controlled to open a preset number of steps to allow refrigerant to flow through the stopped indoor unit. Then, the electronic expansion valve is controlled to decrease at a preset rate, and the exhaust temperature and the liquid valve temperature of the indoor unit are obtained during the decreasing process. This is because as the electronic expansion valve decreases, the amount of refrigerant flowing through the stopped indoor unit gradually decreases, the exhaust temperature gradually increases, and the liquid valve temperature of the stopped indoor unit also gradually increases, with the increase in exhaust temperature being greater than that of the liquid valve temperature. When the electronic expansion valve gradually approaches the valve opening pulse, the refrigerant gradually stops flowing through the stopped indoor unit, the exhaust temperature gradually stops changing, and the liquid valve temperature also gradually stops changing. Therefore, when the exhaust temperature and liquid valve temperature are at their maximum, the number of steps of the electronic expansion valve at this time is considered the valve opening pulse. This application's solution controls the number of steps of the electronic expansion valve of the stopped indoor unit, which can accurately obtain the valve opening pulse of the electronic expansion valve of the stopped indoor unit. At this time, the obtained valve opening pulse is a specific value, rather than a range value, which can ensure the accuracy of control. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart of a method for determining the opening pulse of an electronic expansion valve provided in an embodiment of this application;

[0039] Figure 2This is a schematic diagram of the result of an electronic expansion valve opening pulse determination device provided in an embodiment of this application;

[0040] Figure 3 This is a flowchart of a valve opening pulse detection method provided in an embodiment of this application. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The valve opening pulse refers to the number of steps (or pulses) required for an electronic expansion valve to go from being fully closed to just beginning to open (reaching a certain flow rate). Taking a typical needle-type electronic expansion valve as an example, a buffer spring is usually designed above the valve needle to reduce the impact force between the valve needle and the valve port when the valve is closed. When the valve is fully closed, the spring is in a compressed state. When we open the valve, we first overcome the spring's return stroke, but the valve needle is still in a fully closed state, and the valve is not yet open. If we continue to apply the opening pulse, the valve needle continues to move upward until a specified flow rate is reached, at which point the valve is considered to have started to open. For example, 32 steps.

[0043] Existing electronic expansion valves are manufactured with a specified opening pulse range, such as 32±20, meaning the known opening pulse value is only between 12 and 52. However, the exact value is unclear. In precise control applications, this error is too large to meet the required conditions.

[0044] To solve the above problems, refer to Figure 1 This application provides a method for determining the opening pulse of an electronic expansion valve, including:

[0045] S11: When a stop signal is received from any indoor unit, the electronic expansion valve corresponding to the indoor unit is controlled to a preset number of steps. When the electronic expansion valve reaches the preset number of steps, the refrigerant can pass through the electronic expansion valve.

[0046] In practice, the preset number of steps is set to be greater than or equal to the maximum value of the valve opening pulse range, and less than or equal to the number of steps when fully open. The valve opening pulse range and the number of steps when fully open vary depending on the specific type of electronic expansion valve.

[0047] Preferably, the preset number of steps is the maximum value of the valve opening pulse range. Since it is only necessary to ensure that the refrigerant can pass through the electronic expansion valve, the preset number of steps can be directly set to the maximum value of the valve opening pulse range. For example, when the valve opening pulse range is 32±20, the number of steps can be directly set to 52. When the valve opening pulse range is at its maximum value, the electronic expansion valve will definitely be open, and the refrigerant can flow through the electronic expansion valve.

[0048] Of course, you can also set a larger number of steps, such as turning it all on. However, when turning it all on, the time taken for subsequent frequency reduction is longer.

[0049] S12: Control the electronic expansion valve to decrease at a preset rate, and obtain the exhaust temperature and the liquid valve temperature of the indoor unit;

[0050] The preset rate is set according to the actual situation, such as 1P / min, which means that the electronic expansion valve's step count decreases by 1P every minute, where 1P represents 1 step. While controlling the step count to decrease, the exhaust temperature and the indoor unit's liquid valve temperature are obtained, where the liquid valve temperature is the pipe temperature of each small pipe corresponding to the indoor unit on the valve support component.

[0051] S13: If the difference between the exhaust temperature and the liquid valve temperature is the largest and remains unchanged for a preset duration, then the electronic expansion valve step number corresponding to the earliest time when the difference is the largest is taken as the valve opening pulse.

[0052] When any indoor unit stops, the electronic expansion valve corresponding to the stopped indoor unit opens a preset number of steps to allow refrigerant to flow through it. Then, the electronic expansion valve decreases at a preset rate, and the exhaust temperature and the liquid valve temperature of the indoor unit are measured during this decrease. As the electronic expansion valve decreases, the amount of refrigerant flowing through the stopped indoor unit gradually decreases, the exhaust temperature gradually increases, and the liquid valve temperature of the stopped indoor unit also gradually increases, with the increase in exhaust temperature exceeding that of the liquid valve temperature. When the electronic expansion valve's steps approach the opening pulse, the refrigerant gradually stops flowing through the stopped indoor unit, the exhaust temperature gradually stops changing, and the liquid valve temperature also gradually stops changing. Therefore, when the exhaust temperature and liquid valve temperature are at their maximum, the electronic expansion valve's steps at this point represent the opening pulse. This application's solution, by controlling the number of steps of the electronic expansion valve of the stopped indoor unit, can accurately obtain the opening pulse of the electronic expansion valve of the stopped indoor unit. The obtained opening pulse is a specific value, not a range value, ensuring accurate control.

[0053] It should be noted that, since single-control operations may be subject to randomness, in order to ensure the accuracy of the obtained valve-opening pulses, this embodiment further includes: after obtaining a valve-opening pulse, resetting the number of steps of the electronic expansion valve to the preset number of steps, and controlling the electronic expansion valve to decrease at the preset rate until a preset number of valve-opening pulses are obtained; summing all valve-opening pulses and calculating a first average value, and using the first average value as the final valve-opening pulse. That is, averaging after multiple controls to eliminate errors.

[0054] Furthermore, in actual control processes, various factors may cause the recorded valve opening pulse to differ significantly from other valve opening pulses. Therefore, this embodiment further includes: deleting valve opening pulses whose absolute value of the difference from the first average value is greater than a preset value; summing the remaining valve opening pulses to calculate a second average value, and using the second average value as the final valve opening pulse. When the absolute value of the difference from the first average value is greater than the preset value, it indicates that the valve opening pulse has a large error. To ensure the accuracy of the final valve opening pulse, these valve opening pulses are deleted before calculating the average value.

[0055] In existing technology, the electronic expansion valve of the indoor unit does not change before and after the unit stops. This results in the refrigerant still flowing through the indoor unit after it stops if the electronic expansion valve is open before the unit stops. The refrigerant flowing through the indoor unit will cause noise, affecting the user experience.

[0056] In a multi-split air conditioning system where one outdoor unit connects to two or more indoor units, each indoor unit has different needs. Because the system operates in heating mode, the refrigerant from the compressor first passes through the indoor unit before flowing to the electronic expansion valve. Therefore, when some indoor units are off, the electronic expansion valve corresponding to the off-duty indoor unit remains open to prevent refrigerant buildup. This means refrigerant continues to flow through the off-duty indoor unit. The opening degree of the electronic expansion valve for the off-duty indoor unit affects the refrigerant flow rate and the noise level, leading to noise problems and potential after-sales complaints. This application proposes a logic control method for handling the opening degree of multi-split air conditioners to solve this problem, achieving "intelligent control" of the opening degree to resolve the noise problem of off-duty indoor units. The specific steps are as follows:

[0057] When a shutdown signal is received from any indoor unit, the electronic expansion valve of the indoor unit is controlled by an opening pulse, which is determined by the electronic expansion valve opening pulse determination method provided in the above embodiment.

[0058] When the valve opening pulse runs for a preset duration, the electronic expansion valve step count is increased by a preset value.

[0059] The method provided in this application controls the electronic expansion valve of the stopped indoor unit to open with a pulse when the indoor unit is stopped. At this time, the refrigerant cannot flow through the stopped indoor unit, thus solving the problem of noise caused by refrigerant flow when the indoor unit is stopped.

[0060] It should be noted that in multi-split air conditioning units, some indoor units may stop operating. During heating, due to system limitations, refrigerant may still flow through these units, leading to noise issues and potential after-sales complaints. Therefore, our solution is to close the shut-off indoor units to prevent refrigerant flow. However, for system safety, a certain opening should be introduced after a period of closure to prevent refrigerant buildup. This opening should be determined after the valve opening pulse is established. Excessive opening will also cause noise during the valve's open period. Therefore, the electronic expansion valve's steps should be set to the valve opening pulse, rather than directly closing to 0%. To ensure performance and reliability, for multi-split air conditioning units, the shut-off indoor units should operate at the valve opening pulse opening for a period during heating, after which a preset value should be added to prevent refrigerant buildup and noise generation. The preset value should be set according to actual needs.

[0061] To more clearly illustrate the solution of this application, a specific implementation method is provided below, such as... Figure 2 As shown, the first condition for determining whether there is a shut-down indoor unit is first determined. If the indoor unit is fully open and there is no shut-down indoor unit, the system continues to operate according to the control logic. If an indoor unit that has received a shutdown signal is detected, the electronic expansion valve of the shut-down indoor unit is adjusted to the P1 value, which is the maximum value of the opening pulse of the corresponding model of electronic expansion valve, while the indoor unit is running according to the system logic. At the same time, the valve opening is reduced at a rate of 1P / min.

[0062] Secondly, T is detected once per minute. i排气 Value and T corresponding to the shutdown of the indoor unit i液阀 Value, and record T i排气 Value and T i液阀 The difference is ΔT i The value is T, which is the value of the electronic expansion valve corresponding to the shut-down indoor unit closing at a rate of 1P / min. i排气 The value will gradually increase, as T... i排气 The increase in the value corresponds to the T value of the indoor unit being shut down. i液阀 The value will gradually increase, but when the opening degree of the electronic expansion valve corresponding to the shut-down indoor unit gradually approaches the valve opening pulse value, T i排气 The value will gradually stabilize because the opening degree of the electronic expansion valve corresponding to the shut-off indoor unit gradually approaches the valve opening pulse value. At this time, the refrigerant in the shut-off indoor unit has basically no circulation, so the T value corresponding to the shut-off indoor unit will gradually stabilize. i液阀The value will gradually stabilize and decrease, so when the opening degree of the electronic expansion valve corresponding to the shut-down indoor unit gradually approaches the valve opening pulse value, ΔT i The value is T i排气 Value and T i液阀 The difference will have a maximum value ΔT. max At this time, the electronic expansion valve corresponding to the shut-down indoor unit continues to close at a rate of 1P / min, and ΔT is detected continuously for tmin. max With the value remaining constant, the opening degree of the electronic expansion valve at this time is measured as P. i If the value is P, then record it. i -t represents the initial value of ΔT. max Opening degree P corresponding to time n value.

[0063] Record a set of P n After setting the value, the indoor unit opening is adjusted back to the P1 value, and the above steps are repeated to record the initial value of ΔT. max Opening degree P corresponding to time n The value is determined by performing n loops based on different conditions of different machines, and recording n sets of P values. n After the value, for n groups of P n The values ​​are processed, and values ​​that differ from the others by more than 5P are deleted. The remaining values ​​are then calculated using the arithmetic mean method to obtain the P2 value, which is the opening pulse value of the electronic expansion valve corresponding to the indoor unit when it is stopped in heating mode.

[0064] After calculating the P2 value (the opening pulse value of the electronic expansion valve corresponding to the shut-down indoor unit in heating mode) according to the above procedure, the P2 value is substituted into the opening pulse processing procedure. This value will be retained in memory after being calculated without interrupting the power supply to the prototype. When the prototype is in heating mode and some indoor units stop again, and the opening pulse value of the stopped indoor unit has been detected, the opening pulse processing procedure will be run directly without repeating the opening pulse detection procedure.

[0065] Because different models operate differently, after detecting the opening pulse value P2 of the electronic expansion valve corresponding to the indoor unit that received the stop signal, the electronic expansion valve of the indoor unit that received the stop signal runs at the P2 value for t1 minutes. Considering the performance and reliability requirements of the prototype, the opening needs to be adjusted to P2+P. x Values ​​are calculated after running for t2 minutes, P x The value depends on the specific prototype. As long as the prototype does not receive a start-up signal while other prototypes are in heating mode, the above process will continue to cycle. If the indoor unit, which has detected the valve opening pulse P2 value, receives a stop signal again while the prototype is in heating mode and the power is on, it will continue to cycle according to the above process.

[0066] If, during the valve opening pulse detection and processing operation of the prototype, the indoor unit that has received a shutdown signal receives a startup signal again, or the prototype experiences a protection signal, the valve opening pulse detection and processing operation will be terminated, and the system control logic will be used instead.

[0067] Wherein, P1 represents the maximum value of the opening pulse indicated by different electronic expansion valves, P.

[0068] T i排气 —The exhaust temperature value detected per minute during the valve closing process at 1P / min, in °C.

[0069] T i液阀 —The temperature of the liquid valve detected per minute during the valve closing process at 1P / min, in °C.

[0070] ΔT i —The difference between the exhaust temperature and the liquid temperature detected per minute during valve closing at 1P / min, in °C.

[0071] ΔT max —The maximum difference between the exhaust temperature and the liquid valve temperature detected during valve closure, in °C.

[0072] t——Maintain ΔT max The time during which it remains constant, min.

[0073] P i —Maintain ΔT max The opening value, P, corresponding to the time tmin remains constant.

[0074] P n —Initially reaching ΔT max The opening degree corresponding to time, P

[0075] P2 — the corresponding opening pulse of the electronic expansion valve, P

[0076] P x —The opening value, P, is added based on the opening pulse of the corresponding electronic expansion valve.

[0077] t1 — The time (in minutes) during which the valve opening pulse P2 is applied.

[0078] t2——with opening P2+P x Runtime, in minutes.

[0079] This control method has a simple operating logic and solves the problem of noise caused by refrigerant flow when the indoor unit is closed in the heating state of a multi-split air conditioner. It achieves "intelligent control" of the opening degree to solve the noise problem based on the different states of the electronic expansion valves of various prototypes.

[0080] Based on the same inventive concept, this application provides an electronic expansion valve opening pulse determination device, such as... Figure 3 As shown, it includes:

[0081] The preset step control module 31 is used to control the electronic expansion valve corresponding to any indoor unit to a preset step number when a stop signal is received from any indoor unit. When the electronic expansion valve step number is the preset step number, the refrigerant can pass through the electronic expansion valve. Optionally, the preset step number is the maximum value of the valve opening pulse range.

[0082] The step reduction module 32 is used to control the step count of the electronic expansion valve to decrease at a preset rate, and to obtain the exhaust temperature and the liquid valve temperature of the indoor unit.

[0083] The valve opening pulse acquisition module 33 is used to take the electronic expansion valve step number corresponding to the earliest time when the difference between the exhaust temperature and the liquid valve temperature is the largest and remains unchanged for a preset duration as the valve opening pulse.

[0084] It should be noted that after a valve opening pulse is acquired, the valve opening pulse acquisition module 33 resets the number of steps of the electronic expansion valve to the preset number of steps, and controls the electronic expansion valve to decrease at the preset rate until a preset number of valve opening pulses are obtained; after summing all the valve opening pulses, the first average value is calculated, and the first average value is used as the final valve opening pulse.

[0085] In addition, the valve opening pulse acquisition module 33 deletes valve opening pulses whose absolute value of the difference between the first average value and the first average value is greater than a preset value; it sums up the remaining valve opening pulses and calculates the second average value, and uses the second average value as the final valve opening pulse.

[0086] The electronic expansion valve opening pulse determination device provided in this application determines the opening pulse of the electronic expansion valve of the stopped indoor unit by controlling the number of steps opened to a preset number when any indoor unit stops, so that refrigerant can flow through the stopped indoor unit. Then, the number of steps of the electronic expansion valve is controlled to decrease at a preset rate, and the exhaust temperature and the liquid valve temperature of the indoor unit are obtained during the decreasing process. This is because as the number of steps of the electronic expansion valve decreases, the amount of refrigerant flowing through the stopped indoor unit gradually decreases, the exhaust temperature gradually increases, and the liquid valve temperature of the stopped indoor unit also gradually increases, with the increase in exhaust temperature being greater than that of the liquid valve temperature. When the number of steps of the electronic expansion valve gradually approaches the opening pulse, the refrigerant gradually stops flowing through the stopped indoor unit, the exhaust temperature gradually stops changing, and the liquid valve temperature also gradually stops changing. Therefore, when the exhaust temperature and liquid valve temperature are at their maximum, the number of steps of the electronic expansion valve at this time indicates that it is the opening pulse. This application's solution, by controlling the number of steps of the electronic expansion valve of the stopped indoor unit, can accurately obtain the opening pulse of the electronic expansion valve of the stopped indoor unit. The obtained opening pulse is a specific value, not a range value, ensuring accurate control.

[0087] Based on the same inventive concept, this application also provides an air conditioning control device for use in multi-unit air conditioning systems: the device includes:

[0088] The step control module is used to control the electronic expansion valve of the indoor unit to open the valve pulse when a stop signal of any indoor unit is received. The opening valve pulse is determined by the electronic expansion valve opening pulse determination method provided in the above embodiment.

[0089] The step increment module is used to control the electronic expansion valve to increase the step count by a preset value when the valve opening pulse is running for a preset duration.

[0090] The air conditioning control device provided in this application embodiment controls the electronic expansion valve of the stopped indoor unit to open with a valve pulse when the indoor unit is stopped. At this time, the refrigerant cannot flow through the stopped indoor unit, thus solving the problem of noise caused by refrigerant flow when the indoor unit is stopped. After running at the valve pulse opening degree for a period of time, the preset value needs to be increased to prevent refrigerant from accumulating in the stopped indoor unit and to prevent the stopped indoor unit from generating noise.

[0091] Based on the same inventive concept, this application provides an electronic device, including:

[0092] At least one processor and at least one memory;

[0093] The memory stores the executable instructions of the processor;

[0094] The processor is configured to execute the electronic expansion valve opening pulse determination method provided in the above embodiments.

[0095] The electronic device provided in this application embodiment stores executable instructions of the processor in a memory. When the executable instructions are executed, the processor can control the electronic expansion valve corresponding to the shut-down indoor unit to open a preset number of steps when any indoor unit is shut down, so that the refrigerant can flow through the shut-down indoor unit. Then, the processor controls the electronic expansion valve to decrease at a preset rate, and obtains the exhaust temperature and the liquid valve temperature of the indoor unit during the decreasing process. This is because as the electronic expansion valve decreases, the refrigerant flowing through the shut-down indoor unit gradually decreases, the exhaust temperature gradually increases, and the liquid valve temperature of the shut-down indoor unit also gradually increases, and the increase in exhaust temperature is greater than that of liquid valve temperature. When the electronic expansion valve gradually approaches the opening pulse, the refrigerant gradually stops flowing through the shut-down indoor unit, the exhaust temperature gradually stops changing, and the liquid valve temperature also gradually stops changing. Therefore, when the exhaust temperature and liquid valve temperature are at their maximum, the electronic expansion valve's step count is at the opening pulse. This application's solution controls the number of steps of the electronic expansion valve of the stopped indoor unit, which can accurately obtain the valve opening pulse of the electronic expansion valve of the stopped indoor unit. At this time, the obtained valve opening pulse is a specific value, rather than a range value, which can ensure the accuracy of control.

[0096] Based on the same inventive concept, this application provides an electronic device, including:

[0097] At least one processor and at least one memory;

[0098] The memory stores the executable instructions of the processor;

[0099] The processor is configured to execute the air conditioning control method provided in the above embodiments.

[0100] The electronic device provided in this application stores executable instructions for the processor in its memory. When these instructions are executed, the processor can control the electronic expansion valve of the stopped indoor unit to open with a valve pulse when the indoor unit is stopped. At this time, refrigerant cannot flow through the stopped indoor unit, thus solving the problem of noise caused by refrigerant flow when the indoor unit is stopped. Compared with directly setting the step count of the stopped electronic expansion valve to 0, this method involves less movement of the electronic expansion valve and faster control time.

[0101] Based on the same inventive concept, this application also provides an air conditioner that uses the electronic expansion valve opening pulse determination method or the air conditioner control method provided in the above embodiments.

[0102] The air conditioner provided in this application embodiment can, when any indoor unit stops, control the electronic expansion valve corresponding to the stopped indoor unit to open a preset number of steps, allowing refrigerant to flow through the stopped indoor unit; then, control the electronic expansion valve to decrease at a preset rate, and obtain the exhaust temperature and the liquid valve temperature of the indoor unit during the decreasing process. This is because as the electronic expansion valve decreases, the amount of refrigerant flowing through the stopped indoor unit gradually decreases, the exhaust temperature gradually increases, and the liquid valve temperature of the stopped indoor unit also gradually increases, with the increase in exhaust temperature exceeding the increase in liquid valve temperature. When the electronic expansion valve's steps approach the opening pulse, the refrigerant gradually stops flowing through the stopped indoor unit, the exhaust temperature gradually stops changing, and the liquid valve temperature also gradually stops changing. Therefore, when the exhaust temperature and liquid valve temperature are at their maximum, the electronic expansion valve's steps at this point are considered the opening pulse. This application's solution, by controlling the steps of the electronic expansion valve of the stopped indoor unit, can accurately obtain the opening pulse of the electronic expansion valve of the stopped indoor unit. The obtained opening pulse is a specific value, not a range value, ensuring accurate control. Furthermore, when the indoor unit stops, the electronic expansion valve of the stopped indoor unit is controlled by an opening pulse. At this time, the refrigerant cannot flow through the stopped indoor unit, thus solving the problem of noise caused by refrigerant flow when the indoor unit is stopped. After running at the opening pulse opening for a period of time, the preset value needs to be increased to prevent refrigerant from accumulating in the stopped indoor unit and to prevent the stopped indoor unit from generating noise.

[0103] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0104] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0105] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0106] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0107] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0108] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0109] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0110] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0111] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for determining the opening pulse of an electronic expansion valve, characterized in that, Applied to multi-unit systems, including: When a shutdown signal is received from any indoor unit, the electronic expansion valve corresponding to that indoor unit is controlled to a preset number of steps. When the electronic expansion valve reaches the preset number of steps, the refrigerant can pass through the electronic expansion valve. The electronic expansion valve is controlled to decrease at a preset rate, and the exhaust temperature and the liquid valve temperature of the indoor unit are obtained. If the difference between the exhaust temperature and the liquid valve temperature is the largest and remains unchanged for a preset duration, then the electronic expansion valve step number corresponding to the earliest time when the difference is the largest is taken as the valve opening pulse.

2. The method according to claim 1, characterized in that, Also includes: Once an opening pulse is obtained, the number of steps of the electronic expansion valve is reset to the preset number of steps, and the electronic expansion valve is controlled to decrease at the preset rate until the preset number of opening pulses are obtained. Sum all the valve opening pulses and calculate the first average value. Use the first average value as the final valve opening pulse.

3. The method according to claim 2, characterized in that, Also includes: Delete valve opening pulses whose absolute value of the difference from the first average value is greater than a preset value; The remaining valve opening pulses are summed and the second average value is calculated. This second average value is then used as the final valve opening pulse.

4. The method according to claim 1, characterized in that: The preset number of steps is the maximum value of the valve opening pulse range.

5. An air conditioning control method, characterized in that, Applied to multi-unit systems: The method includes: When a shutdown signal is received from any indoor unit, the electronic expansion valve of the indoor unit is controlled by an opening pulse, which is determined by the method described in any one of claims 1-4. When the valve opening pulse runs for a preset duration, the electronic expansion valve step count is increased by a preset value.

6. A device for determining the opening pulse of an electronic expansion valve, characterized in that, Applied to multi-unit systems, including: The preset step control module is used to control the electronic expansion valve corresponding to any indoor unit to a preset step number when a stop signal is received from any indoor unit. When the electronic expansion valve reaches the preset step number, the refrigerant can pass through the electronic expansion valve. The step reduction module is used to control the electronic expansion valve to reduce the number of steps at a preset rate, and to obtain the exhaust temperature and the liquid valve temperature of the indoor unit. The valve opening pulse acquisition module is used to take the electronic expansion valve step number corresponding to the earliest time when the difference between the exhaust temperature and the liquid valve temperature is the largest and remains unchanged for a preset duration as the valve opening pulse.

7. An air conditioning control device, characterized in that, Applied to multi-unit generator sets: The device includes: A step control module is used to control the electronic expansion valve of the indoor unit to open the valve pulse when a stop signal is received from any indoor unit, wherein the opening valve pulse is determined by the method according to any one of claims 1-4; The step increment module is used to control the electronic expansion valve to increase the step count by a preset value when the valve opening pulse is running for a preset duration.

8. An electronic device, characterized in that, include: At least one processor and at least one memory; The memory stores the executable instructions of the processor; The processor is configured to perform the method according to any one of claims 1-4.

9. An electronic device, characterized in that, include: At least one processor and at least one memory; The memory stores the executable instructions of the processor; The processor is configured to perform the method of claim 5.

10. An air conditioner, characterized in that: Apply the method described in any one of claims 1-4 or claim 5.

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