Electronic expansion valve control method, device and air conditioning system

Abstract

This invention discloses an electronic expansion valve control method, device, and air conditioning system. The method includes: detecting a change in the on / off state of an indoor unit; for each on-duty indoor unit, determining the degree of lag in indoor unit control based on changes in system operating load and changes in specified parameters when the system load changes; adjusting the control cycle of the indoor electronic expansion valve of that indoor unit according to the lag degree; and controlling the indoor electronic expansion valve of that indoor unit according to the adjusted control cycle. This invention improves the response speed of the indoor electronic expansion valve under system fluctuations, increases the response rate of the indoor unit, avoids the situation where slow adjustment according to the conventional control cycle leads to large indoor temperature fluctuations and reduced indoor comfort, achieves effective regulation of the indoor electronic expansion valve, and solves the problem of slow response of the indoor electronic expansion valve under system fluctuations.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an electronic expansion valve control method, device, and air conditioning system. Background Technology

[0002] In actual use, multi-split air conditioning units will experience the switching on and off of indoor units. The indoor electronic expansion valve changes from closed to a certain opening degree or vice versa. This change leads to a redistribution of refrigerant on the indoor side. The outdoor unit performs capacity calculations and adjusts the compressor's capacity output accordingly. However, due to the influence of actual engineering piping length and the amplitude of capacity changes, the compressor's capacity output may lag behind the impact of the indoor electronic expansion valve opening or closing on the refrigerant quantity of the already-operated indoor units. This can result in insufficient or excessive refrigerant for heat exchange in the already-operated indoor units.

[0003] Currently, indoor electronic expansion valves use a fixed control cycle under all circumstances. If the control cycle is too long when the system is in a fluctuating state, the indoor unit will react too slowly to the redistribution of the refrigerant and the fluctuation of capacity. This will cause the temperature difference between the inlet and outlet pipes of the indoor unit to increase. During the process of adjusting to balance, the pipe temperature will fluctuate greatly, which will eventually lead to large fluctuations in the outlet air temperature and a deterioration in user comfort.

[0004] There is currently no effective solution to the problem of slow response of indoor electronic expansion valves under system fluctuations in existing technologies. Summary of the Invention

[0005] This invention provides an electronic expansion valve control method, device, and air conditioning system to at least solve the problem of slow response of indoor electronic expansion valves under system fluctuations in the prior art.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide an electronic expansion valve control method, comprising:

[0007] A change in the on / off status of the indoor unit was detected;

[0008] For each indoor unit that has been turned on, the degree of lag in indoor unit control is determined based on changes in system operating load and changes in specified parameters when system load changes.

[0009] The control cycle of the indoor electronic expansion valve of the indoor unit is adjusted according to the degree of lag.

[0010] The indoor electronic expansion valve of the indoor unit is controlled according to the adjusted control cycle.

[0011] Optionally, the degree of lag in indoor unit control can be determined based on changes in system operating load and changes in specified parameters when system load changes, including:

[0012] The first coefficient is determined based on the changes in the system's operating load;

[0013] The second coefficient is determined based on the changes in the specified parameters corresponding to the current working mode;

[0014] Calculate the product of the first coefficient and the second coefficient to obtain the reference coefficient;

[0015] Obtain the degree of lag corresponding to the reference coefficient, wherein the smaller the reference coefficient, the stronger the lag.

[0016] Optionally, the first coefficient is determined based on changes in the system's operating load, including:

[0017] Obtain the amplitude of operating load changes;

[0018] The operating load change level is determined based on the magnitude of the operating load change and the pre-defined operating load range;

[0019] The first coefficient is determined based on the level of change in operating load.

[0020] Optionally, based on the magnitude of the operating load change and the pre-defined operating load range, the operating load change level is determined, including:

[0021] If the magnitude of the change in operating load is greater than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the level of the change in operating load is determined to be unchanged.

[0022] If the magnitude of the change in operating load is greater than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of the change in operating load is determined to be upgraded, wherein the number of upgrades is equal to the number of intervals changed.

[0023] If the magnitude of the change in operating load is less than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the level of the change in operating load is determined to be unchanged.

[0024] If the magnitude of the change in operating load is less than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of the change in operating load is determined to be downgraded, wherein the number of downgrades is equal to the number of intervals that have changed.

[0025] Optionally, determining the first coefficient based on the operational load change level includes:

[0026] The larger the level of change corresponding to the operating load change level, the smaller the first coefficient;

[0027] The first coefficient is at its maximum when the operating load change level remains constant.

[0028] The first coefficient when the operating load change level is increased by n levels is equal to the first coefficient when the operating load change level is decreased by n levels;

[0029] The first coefficient is greater than 0 and less than 1.

[0030] Optionally, the second coefficient can be determined based on the changes in specified parameters corresponding to the current working mode, including:

[0031] In cooling mode, for each indoor unit that has been turned on, the change amplitude of the low pressure of the system module is obtained when the system load changes;

[0032] When the change amplitude of the low voltage of the system module is greater than or equal to 0, the larger the range of the change amplitude of the low voltage of the system module, the smaller the second coefficient;

[0033] The second coefficient is at its maximum when the amplitude of the low-voltage change in the system module is less than 0.

[0034] The second coefficient is greater than 0 and less than 1.

[0035] Optionally, if the amplitude of the low-voltage change in the system module is greater than or equal to 0, the following further applies:

[0036] Acquire the amplitude of the change in indoor unit inlet pipe temperature when the system load changes;

[0037] The second coefficient is determined based on the variation amplitude of the low pressure of the system module and the variation amplitude of the inlet pipe temperature of the indoor unit.

[0038] Optionally, the second coefficient is determined based on the variation amplitude of the low pressure of the system module and the variation amplitude of the inlet pipe temperature of the indoor unit, including:

[0039] Determine the first interval in which the low-pressure change amplitude of the system module is located and the second interval in which the absolute value of the change amplitude of the indoor unit's inlet pipe temperature is located;

[0040] Within the same first interval, the larger the second interval, the smaller the second coefficient;

[0041] For different first intervals, the maximum value of the second coefficient is greater in the smaller first interval than in the larger first interval.

[0042] Optionally, the second coefficient can be determined based on the changes in specified parameters corresponding to the current working mode, including:

[0043] In heating mode, for each indoor unit that has been turned on, the change amplitude of the high voltage of the system module is obtained when the system load changes;

[0044] When the change amplitude of the high voltage of the system module is less than or equal to 0, the larger the range of the change amplitude of the high voltage of the system module, the smaller the second coefficient;

[0045] The second coefficient is at its maximum when the amplitude of the change in the high voltage of the system module is greater than 0.

[0046] The second coefficient is greater than 0 and less than 1.

[0047] Optionally, if the amplitude of the change in the high voltage of the system module is less than or equal to 0, the following further applies:

[0048] Acquire the amplitude of the change in indoor unit inlet pipe temperature when the system load changes;

[0049] The second coefficient is determined based on the change amplitude of the high voltage of the system module and the change amplitude of the inlet pipe temperature of the indoor unit.

[0050] Optionally, the second coefficient is determined based on the amplitude of the change in high pressure of the system module and the amplitude of the change in the inlet pipe temperature of the indoor unit, including:

[0051] Determine the third interval in which the absolute value of the change amplitude of the high voltage of the system module is located, and the fourth interval in which the absolute value of the change amplitude of the indoor unit inlet pipe temperature is located;

[0052] Within the same third interval, the larger the fourth interval, the smaller the second coefficient;

[0053] For different third intervals, the maximum value of the second coefficient is greater in the smaller third interval than in the larger third interval.

[0054] Optionally, adjusting the control cycle of the indoor unit's electronic expansion valve according to the degree of hysteresis includes:

[0055] Determine a correction coefficient corresponding to the degree of lag, wherein the stronger the lag, the smaller the correction coefficient, and the correction coefficient is greater than 0 and less than or equal to 1;

[0056] The adjusted control cycle is obtained by multiplying the normal control cycle by the correction coefficient.

[0057] Optionally, after controlling the indoor electronic expansion valve of the indoor unit according to the adjusted control cycle, the following is also included:

[0058] When the preset time is reached, the control of the indoor electronic expansion valve will resume according to the normal control cycle.

[0059] This invention also provides an electronic expansion valve control device, comprising:

[0060] The detection module is used to detect changes in the on / off status of the indoor unit;

[0061] The determination module is used to determine the degree of lag in the control of each indoor unit that has been turned on, based on changes in the system operating load and changes in specified parameters when the system load changes.

[0062] An adjustment module is used to adjust the control cycle of the indoor electronic expansion valve of the indoor unit according to the degree of hysteresis.

[0063] The control module is used to control the indoor electronic expansion valve of the indoor unit according to the adjusted control cycle.

[0064] This invention also provides an air conditioning system, including one outdoor unit and at least two indoor units, and further including the electronic expansion valve control device described in this invention.

[0065] This invention also provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in this invention.

[0066] This invention also provides a non-volatile computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method described in this invention.

[0067] By applying the technical solution of this invention, when the on / off state of the indoor unit changes, for each indoor unit that is already turned on, the degree of lag in the indoor unit control is determined based on the changes in the system operating load and the changes in specified parameters when the system load changes. The control cycle of the indoor electronic expansion valve of the indoor unit is adjusted according to the degree of lag, and control is performed according to the adjusted control cycle. This improves the response speed of the indoor electronic expansion valve under system fluctuations, increases the response rate of the indoor unit, and avoids the situation where the indoor temperature fluctuates greatly and reduces indoor comfort due to the slow adjustment according to the conventional control cycle. This achieves effective regulation of the indoor electronic expansion valve and solves the problem of slow response of the indoor electronic expansion valve under system fluctuations. Attached Figure Description

[0068] Figure 1 This is a flowchart of the electronic expansion valve control method provided in Embodiment 1 of the present invention;

[0069] Figure 2 This is a schematic diagram of the structure of a multi-split air conditioning system provided in Embodiment 2 of the present invention;

[0070] Figure 3 This is a control flowchart of the electronic expansion valve provided in Embodiment 2 of the present invention;

[0071] Figure 4 This is a structural block diagram of the electronic expansion valve control device provided in Embodiment 3 of the present invention. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0073] It should be noted that the terms "first," "second," etc., used in the specification, claims, and 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.

[0074] 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, and 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.

[0075] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0076] Example 1

[0077] In the existing technology, the indoor electronic expansion valve adopts a fixed control cycle. This control method results in a slow response speed of valve adjustment when the system adds or switches indoor units, causing capacity fluctuations or when the refrigerant in the indoor unit is redistributed. This affects the inlet and outlet pipe temperatures of the indoor unit, leading to indoor temperature fluctuations.

[0078] This embodiment provides an electronic expansion valve control method applicable to multi-split air conditioning systems. Figure 1 This is a flowchart of the electronic expansion valve control method provided in Embodiment 1 of the present invention, as follows: Figure 1 As shown, the method includes the following steps:

[0079] S11, a change in the on / off status of the indoor unit was detected.

[0080] S12, for each indoor unit that has been turned on, determines the degree of lag in the indoor unit control based on changes in the system operating load and changes in specified parameters when the system load changes.

[0081] S13, adjust the control cycle of the indoor electronic expansion valve of the indoor unit according to the degree of lag.

[0082] S14 controls the indoor electronic expansion valve of the indoor unit according to the adjusted control cycle.

[0083] Changes in the indoor unit's on / off status (such as turning the indoor unit on or off) cause system fluctuations. Indoor unit control exhibits lag, and the degree of system fluctuation is measured by the degree of this lag; the stronger the lag, the greater the system fluctuation. The degree of system control lag is influenced by two factors: the intensity of the system's operating load and the fluctuation amplitude of specified parameters (i.e., key parameters) during system fluctuations. This embodiment adjusts the control cycle of the indoor unit's electronic expansion valve based on the degree of indoor unit control lag, thereby improving the indoor unit's response rate.

[0084] In this embodiment, when the on / off state of the indoor unit changes, for each already powered-on indoor unit, the degree of lag in indoor unit control is determined based on changes in system load and specified parameter changes. The control cycle of the indoor electronic expansion valve is adjusted according to the lag degree, and control is performed according to the adjusted control cycle. This improves the response speed of the indoor electronic expansion valve under system fluctuations, increases the response rate of the indoor unit, and avoids the situation where slow adjustment according to the conventional control cycle leads to large indoor temperature fluctuations and reduced indoor comfort. This achieves effective regulation of the indoor electronic expansion valve and solves the problem of slow response of the indoor electronic expansion valve under system fluctuations. For already powered-on indoor units, different control cycles for different indoor electronic expansion valves can be implemented, making the control more suitable for the needs of the corresponding indoor unit.

[0085] In one implementation, determining the degree of lag in indoor unit control based on changes in system operating load and changes in specified parameters when system load changes includes: determining a first coefficient based on changes in system operating load; determining a second coefficient based on changes in specified parameters corresponding to the current operating mode; calculating the product of the first and second coefficients to obtain a reference coefficient; and obtaining the degree of lag corresponding to the reference coefficient, wherein the smaller the reference coefficient, the stronger the lag.

[0086] The air conditioning system operates in two modes: cooling and heating. Key operating parameters are selected for each mode to determine the degree of lag in the indoor unit control. Specifically, the specified parameters differ between cooling and heating modes. For example, the specified parameters for cooling mode include system module low pressure (corresponding to the compressor suction side pressure), while the specified parameters for heating mode include system module high pressure (corresponding to the compressor discharge side pressure).

[0087] The reference coefficient is greater than 0 and less than 1. The correspondence between the reference coefficient and the degree of lag can be stored in advance. For example, the correspondence between the coefficient interval and the degree of lag can be stored in advance. In the actual control process, the reference coefficient is calculated, the coefficient interval in which the reference coefficient is located is determined, and the degree of lag corresponding to the coefficient interval is obtained.

[0088] This implementation combines the influence of the power level of the system operating load and the fluctuation amplitude of the specified parameters during system fluctuations on the lag of the indoor unit control, and realizes the determination of the degree of lag.

[0089] Specifically, the first coefficient is determined based on the changes in system operating load, including: obtaining the magnitude of the operating load change; determining the level of operating load change based on the magnitude of the operating load change and the pre-divided operating load range; and determining the first coefficient based on the level of operating load change.

[0090] The operating load range can be pre-defined based on the operating load rate or operating load value; for example, it can be divided into low load range, medium load range, and high load range. The operating load change level can reflect the degree of change in the operating load.

[0091] This implementation method determines the operating load change level based on the operating load change amplitude and the pre-divided operating load range, and then determines the first coefficient according to the operating load change level. This can ensure that the influence of the dynamic level of the system operating load on the hysteresis is accurately obtained, thereby ensuring the accuracy and reliability of the hysteresis.

[0092] Furthermore, based on the magnitude of the operating load change and the pre-defined operating load range, the operating load change level is determined, including:

[0093] If the magnitude of the change in operating load is greater than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the operating load change level is determined to be unchanged.

[0094] If the change in operating load is greater than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of operating load change is determined to be upgraded, where the number of upgrades is equal to the number of ranges that have changed.

[0095] If the magnitude of the change in operating load is less than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the operating load change level is determined to be unchanged.

[0096] If the change in operating load is less than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the operating load change level is determined to be downgraded, where the downgrade level is equal to the number of intervals that changed.

[0097] For example, if the change in operating load is greater than 0 and the air conditioning system changes from a low load range to a medium load range, the operating load change level is determined to be upgraded by one level; if the change in operating load is greater than 0 and the air conditioning system changes from a low load range to a high load range, the operating load change level is determined to be upgraded by two levels.

[0098] This implementation method can quickly and effectively determine the level of operating load change based on the magnitude of operating load change and pre-divided operating load intervals.

[0099] Furthermore, the first coefficient is determined based on the level of operational load variation, including:

[0100] The higher the level of change corresponding to the operating load change level, the smaller the first coefficient;

[0101] When the operating load change level remains constant, the first coefficient is the largest;

[0102] The first coefficient when the operating load change level is increased by n is equal to the first coefficient when the operating load change level is decreased by n.

[0103] The first coefficient is greater than 0 and less than 1.

[0104] In this embodiment, the greater the level of change in operating load, the greater the impact of the power of the operating load on the hysteresis. Therefore, the smaller the first coefficient, the shorter the control cycle of the indoor electronic expansion valve will be, thereby accelerating the adjustment of the indoor electronic expansion valve and allowing the system to quickly return to stability.

[0105] The determination of the second coefficient in cooling mode and heating mode will be explained below.

[0106] (1) Cooling mode

[0107] In cooling mode, the saturation temperature corresponding to the low pressure is the evaporation temperature of the indoor unit. When the system is under stable control, the evaporation temperature corresponding to the low pressure and the indoor unit inlet pipe temperature are maintained in a dynamic equilibrium. When the indoor unit is turned on or off, the compressor's capacity output changes, and the distribution of refrigerant on the indoor unit side changes, which will affect the low pressure and the indoor unit inlet pipe temperature.

[0108] The second coefficient is determined based on the changes in specified parameters corresponding to the current operating mode, including: in cooling mode, for each indoor unit that has been turned on, the change amplitude of the system module low pressure when the system load changes; when the change amplitude of the system module low pressure is greater than or equal to 0, the larger the range of the change amplitude of the system module low pressure, the smaller the second coefficient; when the change amplitude of the system module low pressure is less than 0, the second coefficient is the largest; the second coefficient is greater than 0 and less than 1.

[0109] The lower low pressure of the system module indicates that the evaporation temperature of the indoor unit is reduced, which is more conducive to heat exchange in the indoor unit and the cooling effect will be better. Therefore, the second coefficient is taken as the maximum value. Correspondingly, the control cycle of the indoor electronic expansion valve will also be longer.

[0110] When the low pressure of the system module increases, different changes in amplitude can reflect the degree of deterioration in the evaporation temperature. The greater the increase in low pressure, the more severe the evaporation temperature, and the worse the indoor heat exchange effect will be. Therefore, the smaller the second coefficient, the shorter the control cycle of the indoor electronic expansion valve, the faster the adjustment of the indoor electronic expansion valve, and the faster the system can recover stability.

[0111] In this embodiment, the second coefficient can be quickly determined based on the change amplitude of the low pressure of the system module in cooling mode.

[0112] In cooling mode, the second coefficient can also be determined by combining the changes in the system module's low-pressure and the indoor unit's inlet pipe temperature. Within each range of the system module's low-pressure change, a range determination of the indoor unit's inlet pipe temperature change is added, thus more accurately determining the second coefficient. Specifically, when the system module's low-pressure change is greater than or equal to 0, the process also includes: obtaining the change in the indoor unit's inlet pipe temperature when the system load changes; and determining the second coefficient based on the changes in the system module's low-pressure and the indoor unit's inlet pipe temperature.

[0113] Furthermore, based on the variation amplitude of the low-pressure of the system module and the variation amplitude of the indoor unit inlet pipe temperature, a second coefficient is determined, including: determining the first interval in which the variation amplitude of the low-pressure of the system module is located and the second interval in which the absolute value of the variation amplitude of the indoor unit inlet pipe temperature is located; under the same first interval, the larger the second interval, the smaller the second coefficient; for different first intervals, the maximum value of the second coefficient under the smaller first interval is greater than the maximum value of the second coefficient under the larger first interval.

[0114] Under the same first interval, the larger the second interval, the greater the temperature fluctuation of the indoor unit. The greater the impact of the current refrigerant distribution and system capacity output on the indoor unit, the faster the opening adjustment of the indoor electronic expansion valve needs to be, so that the indoor unit can quickly return to stability. Therefore, the second coefficient shows a decreasing trend as the second interval increases, and the calculated new control cycle shows a decreasing trend, that is, the control cycle of the indoor electronic expansion valve becomes shorter.

[0115] (2) Heating mode

[0116] In heating mode, the saturation temperature corresponding to the high pressure is the condensing temperature of the indoor unit. A higher high pressure is beneficial for condensation, while a lower high pressure will worsen condensation and affect the heating performance of the indoor unit.

[0117] The second coefficient is determined based on the changes in the specified parameters corresponding to the current working mode, including: in heating mode, for each indoor unit that has been turned on, the change amplitude of the high voltage of the system module when the system load changes; when the change amplitude of the high voltage of the system module is less than or equal to 0, the larger the range of the change amplitude of the high voltage of the system module, the smaller the second coefficient; when the change amplitude of the high voltage of the system module is greater than 0, the second coefficient is the largest; the second coefficient is greater than 0 and less than 1.

[0118] The greater the reduction in high pressure in the system module, the smaller the corresponding second coefficient, requiring a shorter control cycle for the indoor electronic expansion valve.

[0119] In this embodiment, the second coefficient can be quickly determined based on the change amplitude of the high pressure in the system module under heating mode.

[0120] In heating mode, the second coefficient can also be determined by combining the changes in the system module's high-pressure value and the changes in the indoor unit's inlet pipe temperature. Within each range of the system module's high-pressure value change, a range judgment of the indoor unit's inlet pipe temperature change is added, thus determining the second coefficient more accurately. Specifically, when the system module's high-pressure value change is less than or equal to 0, the following steps are also included: obtaining the change in the indoor unit's inlet pipe temperature when the system load changes; and determining the second coefficient based on the changes in the system module's high-pressure value and the indoor unit's inlet pipe temperature.

[0121] Furthermore, based on the variation amplitude of the high voltage of the system module and the variation amplitude of the indoor unit inlet pipe temperature, a second coefficient is determined, including: determining the third interval in which the absolute value of the variation amplitude of the high voltage of the system module is located and the fourth interval in which the absolute value of the variation amplitude of the indoor unit inlet pipe temperature is located; under the same third interval, the larger the fourth interval, the smaller the second coefficient; for different third intervals, the maximum value of the second coefficient under the smaller third interval is greater than the maximum value of the second coefficient under the larger third interval.

[0122] In one embodiment, adjusting the control cycle of the indoor electronic expansion valve of the indoor unit according to the degree of hysteresis includes: determining a correction coefficient corresponding to the degree of hysteresis, wherein the stronger the hysteresis, the smaller the correction coefficient, and the correction coefficient is greater than 0 and less than or equal to 1; calculating the product of the normal control cycle and the correction coefficient to obtain the adjusted control cycle. The correspondence between the degree of hysteresis and the correction coefficient can be pre-stored. The normal control cycle refers to the default indoor electronic expansion valve control cycle preset in the program. This embodiment obtains a correction coefficient matching different degrees of hysteresis, thereby obtaining an indoor electronic expansion valve control cycle adapted to the degree of hysteresis, achieving effective adjustment of the indoor electronic expansion valve.

[0123] When the indoor unit is controlled according to the new control cycle, a timer begins. Upon reaching the preset time, the control cycle ends, and the system reverts to the regular control cycle. Specifically, after controlling the indoor electronic expansion valve according to the adjusted control cycle, the process further includes: upon reaching the preset time, reverting to the regular control cycle to control the indoor electronic expansion valve. This ensures effective control of the indoor electronic expansion valve. The preset time is a pre-defined time threshold in the program, and its value can range from 2 to 5 minutes.

[0124] Example 2

[0125] The above-described electronic expansion valve control method will now be described with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this application and does not constitute an undue limitation of this application. The same or corresponding terminology used in the above embodiment will not be repeated in this embodiment.

[0126] like Figure 2 The diagram shows the structure of a multi-unit air conditioning system, including: an outdoor unit 101, an indoor unit 201, and connecting pipes between the indoor and outdoor units. The outdoor unit 101 includes: a gas-liquid separator 1, a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, and an outdoor electronic expansion valve 5. The indoor unit 201 includes at least two indoor units, each of which includes an indoor electronic expansion valve 6 and an indoor heat exchanger 7.

[0127] like Figure 3 The diagram shown is a flowchart of the electronic expansion valve control, taking a four-level lag level as an example, including the following steps:

[0128] S301, the air conditioning system is running. At this time, the indoor electronic expansion valve is controlled using the normal control cycle.

[0129] S302: Determine if the on / off status of the indoor unit has changed. If yes, proceed to S303 and S305; otherwise, proceed to S309.

[0130] S303, obtain the change amplitude △Q of the system operating load.

[0131] S304, obtain the μ value (equivalent to the first coefficient mentioned above) based on △Q.

[0132] S305, obtains the change amplitude of a specified parameter in the current working mode.

[0133] S306, Obtain the γ value (equivalent to the second coefficient mentioned above) based on the change amplitude of the specified parameter.

[0134] S307, calculate the reference coefficient ε=μ×γ, and determine the corresponding lag degree based on ε.

[0135] S308. Determine if A < ε ≤ 1. If yes, proceed to S309; ​​otherwise, proceed to S310.

[0136] S309, determine the first level of lag.

[0137] S310, determine whether B<ε≤A is satisfied. If yes, proceed to S311; otherwise, proceed to S312.

[0138] S311, determine the second level of lag.

[0139] S312, determine whether C<ε≤B is satisfied. If yes, proceed to S313; otherwise, proceed to S314.

[0140] S313, determine the lag level three.

[0141] S314, determine the lag level 4.

[0142] S315, determine the correction coefficient β based on the degree of lag, and calculate the new control period.

[0143] S316, execute the control of the indoor electronic expansion valve according to the new control cycle.

[0144] S317: Determine whether the execution time has reached the preset time. If yes, return to S301; otherwise, return to S316.

[0145] This embodiment determines the degree of lag in the control of the indoor unit due to current system fluctuations based on the on / off status of the indoor unit, the amplitude of changes in operating load, and the amplitude of changes in key operating parameters under different modes when load changes occur. Based on the degree of lag, the control cycle of the indoor unit's electronic expansion valve is adjusted so that the opening of the indoor electronic expansion valve can respond to changes in the system in a timely manner.

[0146] The control cycle of the indoor electronic expansion valve is adjusted according to the degree of lag. Specifically, the conventional control cycle t is adjusted. z0 This is achieved by multiplying by a correction factor β. The correction factor β is selected based on the degree of lag. The stronger the lag, the smaller the correction factor β, and the shorter the control cycle of the indoor electronic expansion valve. Conversely, the weaker the lag, the larger the correction factor β, and the longer the control cycle of the indoor electronic expansion valve.

[0147] The degree of lag is determined by the reference coefficient ε, which consists of two parts: one part is the influence of the dynamic level of the operating load on the lag, represented by the letter μ, and the other part is the influence of the parameter fluctuation amplitude on the lag, represented by the letter γ. ε = μ × γ.

[0148] Taking a four-level lag classification as an example, when A < ε ≤ 1, the lag is classified as Level 1; when B < ε ≤ A, the lag is classified as Level 2; when C < ε ≤ B, the lag is classified as Level 3; and when ε ≤ C, the lag is classified as Level 4, where 0 < C < B < A < 1. The lag level is: Level 1 < Level 2 < Level 3 < Level 4, meaning Level 4 lag has the strongest lag.

[0149] For lag level one, the corresponding correction factor β = β1; for lag level two, the corresponding correction factor β = β2; for lag level three, the corresponding correction factor β = β3; and for lag level four, the corresponding correction factor β = β4. 1 = β1 > β2 > β3 > β4 > 0.

[0150] Once the correction factor β is determined, the indoor electronic expansion valve of the indoor unit operates according to the new control cycle t. z =t z0 ×β executes control. When the time for maintaining this control reaches the preset time, it exits this cycle control and resumes control in the normal control cycle.

[0151] For indoor units that are already in operation, different control cycles can be implemented for different indoor electronic expansion valves, making the control more suitable for the needs of the corresponding indoor unit.

[0152] (1) The influence μ of the dynamic level of the operating load on the hysteresis is obtained as follows:

[0153] Taking the three load distribution ranges of the unit as an example: low load range, medium load range and high load range.

[0154] When η x When η ≤ η1, it is a low load range; when η1 < η x When η ≤ 2, it is a medium load range; when η x When the value is greater than η2, it is considered a high load range. η1 and η2 are thresholds used to determine the operating load range.

[0155] Operating load rate η x There are various calculation methods. For example, the ratio of the sum of the operating load before the change and the magnitude of the change in operating load ΔQ to the rated operating capacity of the entire unit can be calculated to obtain the operating load rate η. x .

[0156] If the magnitude of the change in operating load ΔQ ≥ 0, and the system remains within the same operating load range as before the load change, then the level of change in operating load is determined to be unchanged.

[0157] If the magnitude of the change in operating load ΔQ > 0, and the operating load range of the system changes compared to before the load change, if it changes from a low load range to a medium load range or from a medium load range to a high load range, then the operating load change level is determined to be upgraded by one level; if it changes from a low load range to a high load range, then the operating load change level is determined to be upgraded by two levels.

[0158] If the magnitude of the change in operating load ΔQ ≤ 0, and the system is still in the same operating load range as before the load change, then the level of change in operating load is determined to be unchanged.

[0159] If the magnitude of the change in operating load ΔQ < 0, and the operating load range of the system changes compared to before the load change, if it changes from a medium load range to a low load range or from a high load range to a medium load range, then the operating load change level is determined to be downgraded by one level; if it changes from a high load range to a low load range, then the operating load change level is determined to be downgraded by two levels.

[0160] When the operating load change level remains unchanged, μ = μ1;

[0161] When the operating load change level increases or decreases by one level, μ = μ2;

[0162] When the operating load change level is increased by two levels or decreased by two levels, μ = μ3;

[0163] Among them, 1 > μ1 > μ2 > μ3 > 0.

[0164] (2) The effect of parameter fluctuation amplitude on hysteresis γ is obtained as follows:

[0165] The key operating parameters (i.e., the parameters specified above) selected for cooling mode and heating mode are different. In cooling mode, the key operating parameters include: the change amplitude ΔT of the low pressure of the system module. L and the change amplitude △T of the indoor unit inlet pipe temperature rc In heating mode, key operating parameters include: the amplitude of the change in high pressure of the system module, ΔT. P and the change amplitude △T of the indoor unit inlet pipe temperature rh .

[0166] 1) Cooling mode

[0167] Obtain the amplitude ΔT of the low voltage change of the system module when the system load changes. L and the change amplitude △T of the indoor unit inlet pipe temperature rc .

[0168] When △T L When <0, γ=γ1.

[0169] When △T L When the value is ≥0 and less than or equal to the first low-pressure threshold, determine the change amplitude ΔT of the indoor unit inlet pipe temperature. rc If |△T rc | Less than or equal to the first temperature threshold, γ = γ1; if |ΔT rc | if | greater than the first temperature threshold and less than or equal to the second temperature threshold, γ = γ2; if |ΔT rc | if | greater than the second temperature threshold and less than or equal to the third temperature threshold, γ = γ3; if |ΔT rc | Greater than the third temperature threshold, γ = γ4.

[0170] When △T L When the pressure is greater than the first low-pressure threshold and less than or equal to the second low-pressure threshold, determine the change amplitude ΔT of the indoor unit inlet pipe temperature. rc If |△T rc | Less than or equal to the first temperature threshold, γ = γ2; if |ΔT rc | if | greater than the first temperature threshold and less than or equal to the second temperature threshold, γ = γ3; if |ΔT rc | If the temperature is greater than the second temperature threshold, γ = γ4.

[0171] When △T L When the temperature exceeds the second low-pressure threshold, determine the magnitude of the change in the indoor unit's inlet pipe temperature, ΔT. rc If |△T rc | Less than or equal to the first temperature threshold, γ = γ3; if |ΔT rc | If the temperature is greater than the first temperature threshold, γ = γ4.

[0172] When the low pressure increases, i.e., ΔT L >0, different change amplitudes can reflect the degree of deterioration of the evaporation temperature. Here, the first low pressure threshold and the second low pressure threshold are used to determine the magnitude of the increase in low pressure.

[0173] Within each range of low-pressure variation, the variation amplitude of the indoor unit's inlet pipe temperature was also differentiated, using a first temperature threshold, a second temperature threshold, and a third temperature threshold. When the absolute value of the indoor unit's inlet pipe temperature variation amplitude is less than or equal to the first temperature threshold, it indicates that the indoor unit's temperature fluctuation amplitude is small, and the current refrigerant distribution and system capacity output have a relatively small impact on the indoor unit. When the absolute value of the indoor unit's inlet pipe temperature variation amplitude is between the first and second temperature thresholds, it indicates that the indoor unit's temperature fluctuation amplitude is large, and its impact on the indoor unit is significant. When the absolute value of the indoor unit's inlet pipe temperature variation amplitude is between the second and third temperature thresholds, the temperature fluctuation further increases. When the absolute value of the indoor unit's inlet pipe temperature variation amplitude is greater than the third temperature threshold, it indicates that the temperature fluctuation is very large, requiring faster adjustment of the indoor electronic expansion valve's opening to allow the indoor unit to quickly return to stability. Therefore, γ shows a decreasing trend, and consequently, the calculated control cycle shows a decreasing trend, that is, the indoor electronic expansion valve control cycle becomes shorter.

[0174] 2) Heating mode

[0175] Obtain the amplitude ΔT of the high voltage change of the system module when the system load changes. P and the change amplitude △T of the indoor unit inlet pipe temperature rh .

[0176] When △T P >0, γ=γ1.

[0177] When △T P ≤0 and |△T P When the value is less than or equal to the first high-pressure threshold, the change in the indoor unit's inlet pipe temperature ΔT is determined. rh If |△T rh | Less than or equal to the first temperature threshold, γ = γ1; if |ΔT rh | if | greater than the first temperature threshold and less than or equal to the second temperature threshold, γ = γ2; if |ΔT rh | if | greater than the second temperature threshold and less than or equal to the third temperature threshold, γ = γ3; if |ΔT rh | Greater than the third temperature threshold, γ = γ4.

[0178] When △T P ≤0 and |△T P If the temperature is greater than the first high-pressure threshold and less than or equal to the second high-pressure threshold, determine the change amplitude ΔT of the indoor unit's inlet pipe temperature. rh If |△T rh | Less than or equal to the first temperature threshold, γ = γ2; if |ΔT rh | if | greater than the first temperature threshold and less than or equal to the second temperature threshold, γ = γ3; if |ΔT rh | If the temperature is greater than the second temperature threshold, γ = γ4.

[0179] When △T P ≤0 and |△T P When the value exceeds the second high-pressure threshold, the change amplitude ΔT of the indoor unit inlet pipe temperature is determined. rh If |△T rh | Less than or equal to the first temperature threshold, γ = γ3; if |ΔT rh | If the temperature is greater than the first temperature threshold, γ = γ4.

[0180] Within each range of high pressure variation, different thresholds are set for the indoor unit inlet pipe temperature. The greater the variation in the indoor unit inlet pipe temperature, the greater the fluctuation of the indoor unit, and the more necessary it is to accelerate the adjustment of the electronic expansion valve to allow the system to quickly return to stability.

[0181] Wherein, 1 > γ1 > γ2 > γ3 > γ4 > 0; 0 < first low pressure threshold < second low pressure threshold; 0 < first high pressure threshold < second high pressure threshold; first temperature threshold < second temperature threshold < third temperature threshold.

[0182] When the system is in a fluctuating state, the control cycle of the indoor electronic expansion valve adopts a variable cycle method; the greater the fluctuation, the shorter the control cycle. The degree of system fluctuation is measured by the lag in system control; the stronger the lag, the greater the system fluctuation, and the shorter the control cycle of the indoor electronic expansion valve. The lag in system control is affected by two factors: the power level of the operating load and the fluctuation amplitude of the specified parameters when the system fluctuates. By obtaining the corresponding coefficients μ and γ within the intervals of these two factors, a reference coefficient ε is obtained. The lag in system control is determined based on the magnitude of the reference coefficient ε, and finally, a correction coefficient β matching the lag is obtained. The indoor unit executes the control of the indoor electronic expansion valve according to this correction coefficient β.

[0183] In this embodiment, when adding an indoor unit to the system, the control cycle of the indoor electronic expansion valve is adjusted according to the lag in the air conditioning system control. This improves the response speed of the indoor electronic expansion valve under system fluctuations and avoids indoor temperature fluctuations caused by excessively slow regulation, which reduces indoor comfort. By combining the impact of the operating load's power level and the fluctuation amplitude of specified parameters during system fluctuations on the lag, the lag of the on / off operation on system regulation is determined. For different lag levels, a corresponding correction coefficient is obtained, ultimately resulting in a control cycle for the indoor electronic expansion valve adapted to the lag level. This improves the response rate of the indoor unit and achieves effective regulation of the indoor electronic expansion valve.

[0184] Example 3

[0185] Based on the same inventive concept, this embodiment provides an electronic expansion valve control device, which can be used to implement the electronic expansion valve control method described in the above embodiments. This device can be implemented through software and / or hardware.

[0186] Figure 4 This is a structural block diagram of the electronic expansion valve control device provided in Embodiment 3 of the present invention, as shown below. Figure 4 As shown, the device includes:

[0187] The detection module 41 is used to detect changes in the on / off state of the indoor unit;

[0188] The determination module 42 is used to determine the degree of lag in the control of each indoor unit that has been turned on, based on changes in the system operating load and changes in specified parameters when the system load changes.

[0189] Adjustment module 43 is used to adjust the control cycle of the indoor electronic expansion valve of the indoor unit according to the degree of lag;

[0190] The control module 44 is used to control the indoor electronic expansion valve of the indoor unit according to the adjusted control cycle.

[0191] Optionally, the determining module 42 includes:

[0192] The first determining unit is used to determine the first coefficient based on the changes in the system's operating load;

[0193] The second determining unit is used to determine the second coefficient based on the changes in the specified parameters corresponding to the current working mode;

[0194] The first calculation unit is used to calculate the product of the first coefficient and the second coefficient to obtain the reference coefficient;

[0195] The acquisition unit is used to acquire the degree of lag corresponding to the reference coefficient, wherein the smaller the reference coefficient, the stronger the lag.

[0196] Optionally, the first determining unit includes:

[0197] The first acquisition subunit is used to acquire the amplitude of operating load changes;

[0198] The first determining subunit is used to determine the operating load change level based on the operating load change amplitude and the pre-divided operating load range;

[0199] The second determining subunit is used to determine the first coefficient based on the operating load change level.

[0200] Optionally, the first determined sub-unit is specifically used for:

[0201] If the magnitude of the change in operating load is greater than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the level of the change in operating load is determined to be unchanged.

[0202] If the magnitude of the change in operating load is greater than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of the change in operating load is determined to be upgraded, wherein the number of upgrades is equal to the number of intervals changed.

[0203] If the magnitude of the change in operating load is less than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the level of the change in operating load is determined to be unchanged.

[0204] If the magnitude of the change in operating load is less than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of the change in operating load is determined to be downgraded, wherein the number of downgrades is equal to the number of intervals that have changed.

[0205] Optionally, the second determined subunit is specifically used for:

[0206] The larger the level of change corresponding to the operating load change level, the smaller the first coefficient; when the operating load change level is constant, the first coefficient is the largest; the first coefficient when the operating load change level increases by n levels is equal to the first coefficient when the operating load change level decreases by n levels; the first coefficient is greater than 0 and less than 1.

[0207] Optionally, the second determining unit includes:

[0208] The second acquisition subunit is used in cooling mode to acquire the change amplitude of the low pressure of the system module when the system load changes for each indoor unit that has been turned on.

[0209] The third determining subunit is used to determine the second coefficient when the amplitude of the change in the low voltage of the system module is greater than or equal to 0, the larger the range of the amplitude of the change in the low voltage of the system module, the smaller the second coefficient; when the amplitude of the change in the low voltage of the system module is less than 0, the second coefficient is the largest; the second coefficient is greater than 0 and less than 1.

[0210] Optionally, the second determining unit further includes:

[0211] The third acquisition subunit is used to acquire the change amplitude of the indoor unit inlet pipe temperature when the system load changes, provided that the change amplitude of the low pressure of the system module is greater than or equal to 0.

[0212] The fourth determining subunit is used to determine the second coefficient based on the change amplitude of the low pressure of the system module and the change amplitude of the inlet pipe temperature of the indoor unit.

[0213] Optionally, the fourth determining subunit is specifically used for:

[0214] Determine the first interval in which the low-pressure change amplitude of the system module is located and the second interval in which the absolute value of the change amplitude of the indoor unit's inlet pipe temperature is located;

[0215] Within the same first interval, the larger the second interval, the smaller the second coefficient;

[0216] For different first intervals, the maximum value of the second coefficient is greater in the smaller first interval than in the larger first interval.

[0217] Optionally, the second determining unit includes:

[0218] The fourth acquisition subunit is used in heating mode to acquire the change amplitude of the high pressure of the system module when the system load changes for each indoor unit that has been turned on.

[0219] The fifth determining subunit is used to determine the second coefficient when the change amplitude of the high voltage of the system module is less than or equal to 0, the larger the range of the change amplitude of the high voltage of the system module is, the smaller the second coefficient is; when the change amplitude of the high voltage of the system module is greater than 0, the second coefficient is the largest; the second coefficient is greater than 0 and less than 1.

[0220] Optionally, the second determining unit further includes:

[0221] The fifth acquisition subunit is used to acquire the change amplitude of the indoor unit inlet pipe temperature when the system load changes, provided that the change amplitude of the high voltage of the system module is less than or equal to 0.

[0222] The sixth determining subunit is used to determine the second coefficient based on the change amplitude of the high voltage of the system module and the change amplitude of the inlet pipe temperature of the indoor unit.

[0223] Optionally, the sixth determining subunit is specifically used for:

[0224] Determine the third interval in which the absolute value of the change amplitude of the high voltage of the system module is located, and the fourth interval in which the absolute value of the change amplitude of the indoor unit inlet pipe temperature is located;

[0225] Within the same third interval, the larger the fourth interval, the smaller the second coefficient;

[0226] For different third intervals, the maximum value of the second coefficient is greater in the smaller third interval than in the larger third interval.

[0227] Optionally, adjustment module 43 includes:

[0228] The third determining unit is used to determine the correction coefficient corresponding to the degree of lag, wherein the stronger the degree of lag, the smaller the correction coefficient, and the correction coefficient is greater than 0 and less than or equal to 1.

[0229] The second calculation unit is used to calculate the product of the normal control cycle and the correction coefficient to obtain the adjusted control cycle.

[0230] Optionally, the above-mentioned device further includes:

[0231] The recovery module is used to restore the control of the indoor electronic expansion valve of the indoor unit to the normal control cycle after the control module 44 controls the indoor electronic expansion valve according to the adjusted control cycle and a preset time is reached.

[0232] The above-described apparatus can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0233] Example 4

[0234] This embodiment provides an air conditioning system, including one outdoor unit and at least two indoor units, and also includes the electronic expansion valve control device described in the above embodiment.

[0235] Example 5

[0236] This embodiment provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method described in the above embodiment.

[0237] Example 6

[0238] This embodiment provides a non-volatile computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the steps of the method described in the above embodiment.

[0239] The device embodiments described above are merely illustrative. 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 network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0240] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, 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 can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0241] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electronic expansion valve control method characterized by, include: A change in the on / off status of the indoor unit was detected; For each indoor unit that has been turned on, the degree of lag in indoor unit control is determined based on changes in system operating load and changes in specified parameters when system load changes. The control cycle of the indoor electronic expansion valve of the indoor unit is adjusted according to the degree of lag. The indoor electronic expansion valve of the indoor unit is controlled according to the adjusted control cycle; Specifically, the degree of lag in indoor unit control is determined based on changes in system operating load and changes in specified parameters when system load changes, including: The first coefficient is determined based on the changes in the system's operating load; The second coefficient is determined based on the changes in the specified parameters corresponding to the current working mode; Calculate the product of the first coefficient and the second coefficient to obtain the reference coefficient; Obtain the degree of hysteresis corresponding to the reference coefficient, wherein the smaller the reference coefficient, the stronger the hysteresis; the specified parameters in the cooling mode include the low pressure of the system module, and the specified parameters in the heating mode include the high pressure of the system module.

2. The method according to claim 1, characterized in that, The first coefficient is determined based on the changes in the system's operating load, including: Obtain the amplitude of operating load changes; The operating load change level is determined based on the magnitude of the operating load change and the pre-defined operating load range; The first coefficient is determined based on the level of change in operating load.

3. The method according to claim 2, characterized in that, Based on the magnitude of the operating load change and the pre-defined operating load range, the operating load change level is determined, including: If the magnitude of the change in operating load is greater than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the level of the change in operating load is determined to be unchanged. If the magnitude of the change in operating load is greater than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of the change in operating load is determined to be upgraded, wherein the number of upgrades is equal to the number of ranges of change. If the magnitude of the change in operating load is less than or equal to 0, and the air conditioning system is still in the same operating load range as before the load change, then the level of the change in operating load is determined to be unchanged. If the magnitude of the change in operating load is less than 0, and the operating load range of the air conditioning system has changed compared to before the load change, then the level of the change in operating load is determined to be downgraded, wherein the number of downgrades is equal to the number of intervals that have changed.

4. The method according to claim 2, characterized in that, Determining the first coefficient based on the operational load change level includes: The larger the level of change corresponding to the operating load change level, the smaller the first coefficient; The first coefficient is at its maximum when the operating load change level remains constant. The first coefficient when the operating load change level is increased by n levels is equal to the first coefficient when the operating load change level is decreased by n levels; The first coefficient is greater than 0 and less than 1.

5. The method according to claim 1, characterized in that, The second coefficient is determined based on the changes in specified parameters corresponding to the current working mode, including: In cooling mode, for each indoor unit that has been turned on, the change amplitude of the low pressure of the system module is obtained when the system load changes; When the change amplitude of the low voltage of the system module is greater than or equal to 0, the larger the range of the change amplitude of the low voltage of the system module, the smaller the second coefficient; The second coefficient is at its maximum when the amplitude of the low-voltage change in the system module is less than 0. The second coefficient is greater than 0 and less than 1.

6. The method according to claim 5, characterized in that, When the amplitude of the low-voltage change in the system module is greater than or equal to 0, the following is also included: Acquire the amplitude of the change in indoor unit inlet pipe temperature when the system load changes; The second coefficient is determined based on the variation amplitude of the low pressure of the system module and the variation amplitude of the inlet pipe temperature of the indoor unit.

7. The method according to claim 6, characterized in that, The second coefficient is determined based on the variation amplitude of the low pressure in the system module and the variation amplitude of the inlet pipe temperature of the indoor unit, including: Determine the first interval in which the low-pressure change amplitude of the system module is located and the second interval in which the absolute value of the change amplitude of the indoor unit's inlet pipe temperature is located; Within the same first interval, the larger the second interval, the smaller the second coefficient; For different first intervals, the maximum value of the second coefficient is greater in the smaller first interval than in the larger first interval.

8. The method according to claim 1, characterized in that, The second coefficient is determined based on the changes in specified parameters corresponding to the current working mode, including: In heating mode, for each indoor unit that has been turned on, the change amplitude of the high voltage of the system module is obtained when the system load changes; When the change amplitude of the high voltage of the system module is less than or equal to 0, the larger the range of the change amplitude of the high voltage of the system module, the smaller the second coefficient; The second coefficient is at its maximum when the amplitude of the change in the high voltage of the system module is greater than 0. The second coefficient is greater than 0 and less than 1.

9. The method according to claim 8, characterized in that, When the amplitude of the change in high voltage of the system module is less than or equal to 0, the following is also included: Acquire the amplitude of the change in indoor unit inlet pipe temperature when the system load changes; The second coefficient is determined based on the change amplitude of the high voltage of the system module and the change amplitude of the inlet pipe temperature of the indoor unit.

10. The method according to claim 9, characterized in that, The second coefficient is determined based on the amplitude of the high voltage change in the system module and the amplitude of the temperature change in the indoor unit's inlet pipe, including: Determine the third interval in which the absolute value of the change amplitude of the high voltage of the system module is located, and the fourth interval in which the absolute value of the change amplitude of the indoor unit inlet pipe temperature is located; Within the same third interval, the larger the fourth interval, the smaller the second coefficient; For different third intervals, the maximum value of the second coefficient is greater in the smaller third interval than in the larger third interval.

11. The method according to any one of claims 1 to 10, characterized in that, Adjusting the control cycle of the indoor unit's electronic expansion valve according to the degree of lag includes: Determine a correction coefficient corresponding to the degree of lag, wherein the stronger the lag, the smaller the correction coefficient, and the correction coefficient is greater than 0 and less than or equal to 1; The adjusted control cycle is obtained by multiplying the normal control cycle by the correction coefficient.

12. The method according to any one of claims 1 to 10, characterized in that, After controlling the indoor unit's electronic expansion valve according to the adjusted control cycle, the following is also included: When the preset time is reached, the control of the indoor electronic expansion valve will resume according to the normal control cycle.

13. An electronic expansion valve control device, characterized in that, include: The detection module is used to detect changes in the on / off status of the indoor unit; The determination module is used to determine the degree of lag in the control of each indoor unit that has been turned on, based on changes in the system operating load and changes in specified parameters when the system load changes. An adjustment module is used to adjust the control cycle of the indoor electronic expansion valve of the indoor unit according to the degree of hysteresis. The control module is used to control the indoor electronic expansion valve of the indoor unit according to the adjusted control cycle; The determining module includes: The first determining unit is used to determine the first coefficient based on the changes in the system's operating load; The second determining unit is used to determine the second coefficient based on the changes in the specified parameters corresponding to the current working mode; The first calculation unit is used to calculate the product of the first coefficient and the second coefficient to obtain the reference coefficient; The acquisition unit is used to acquire the degree of hysteresis corresponding to the reference coefficient, wherein the smaller the reference coefficient, the stronger the hysteresis; the specified parameters in the cooling mode include the low pressure of the system module, and the specified parameters in the heating mode include the high pressure of the system module.

14. An air conditioning system comprising one outdoor unit and at least two indoor units, characterized in that, Also includes: The electronic expansion valve control device according to claim 13.

15. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 12.

16. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 12.

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