Control method and device of multi-split air conditioner and multi-split air conditioner

Abstract

The invention provides a control method and device for a multi-split air conditioner and the multi-split air conditioner. The method comprises the steps that the instant conduction state of a four-way reversing valve is obtained based on a low-temperature starting signal of the multi-split air conditioner; under the condition that reversing of the four-way reversing valve is identified to be completed through the instant conduction state, the instant load coefficient of the compressor is obtained; and based on the instant load coefficient, a control strategy for adjusting the multi-split air conditioner to operate in the low-temperature starting stage is generated, and the control strategy at least adjusts the initial operation frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve and the second initial opening degree of the indoor electronic expansion valve in the low-temperature starting stage. According to the method, the instant load coefficient of the compressor in the low-temperature starting stage is obtained, the operation parameters of the low-temperature starting stage are determined according to the instant load coefficient, the outdoor unit and the indoor unit can correct the operation parameters according to the instant load coefficient, and therefore the low-temperature starting stage is avoided; the compressor has the phenomena of liquid impact and oil shortage.

Description

Technical Field

[0001] The present invention relates to the technical field of household electrical appliances, and particularly to a control method, a control device and a multi-connected air conditioner for a multi-connected air conditioner. Background Art

[0002] Due to the characteristics that the number of indoor and outdoor units and the output capacity of a multi-connected air conditioner can be freely adjusted according to requirements, the multi-connected air conditioner has been widely used nowadays. As the core component of the multi-connected air conditioner, the compressor is very easily affected by system liquid return and insufficient lubricating oil inside the compressor, resulting in damage to the compressor. Especially in the low-temperature startup stage, how to ensure that there is no liquid hammer in the compressor and avoid the compressor running with insufficient oil has become an urgent problem to improve the service life of the system. Summary of the Invention

[0003] The present invention provides a control method, a control device and a multi-connected air conditioner for a multi-connected air conditioner, so as to solve the defects that in the low-temperature startup stage of the existing multi-connected air conditioner, the compressor has liquid hammer and runs with insufficient oil, which further affects the service life of the system and reduces the user experience.

[0004] According to a control method for a multi-connected air conditioner provided in the first aspect of the present invention, it includes:

[0005] Based on the low-temperature startup signal of the multi-connected air conditioner, obtain the instant conduction state of the four-way reversing valve;

[0006] When the instant conduction state indicates that the four-way reversing valve has completed commutation, obtain the instant load coefficient of the compressor;

[0007] Based on the instant load coefficient, generate a control strategy for adjusting the operation of the multi-connected air conditioner in the low-temperature startup stage, and the control strategy adjusts at least the initial operation frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

[0008] According to an embodiment of the present invention, the obtaining of the instant load coefficient of the compressor specifically includes:

[0009] Obtain the actual operation horsepower and the rated total horsepower of the indoor unit, and determine the horsepower occupancy ratio in the rated total horsepower according to the actual operation horsepower;

[0010] Based on the horsepower occupancy ratio, determine the instant load coefficient.

[0011] Specifically, this embodiment provides an implementation manner for obtaining the instant load coefficient of the compressor.

[0012] According to an embodiment of the present invention, the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage generated based on the instantaneous load factor specifically includes:

[0013] Obtain the first startup coefficient of the compressor. The first startup coefficient is a preset operating parameter. In the case where the preset value of the first startup coefficient is not obtained, the first startup coefficient is the maximum operating frequency of the compressor.

[0014] Based on the first startup coefficient and the instantaneous load factor, determine the initial operating frequency of the compressor in the low-temperature startup stage.

[0015] Specifically, this embodiment provides an implementation manner for generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage.

[0016] According to an embodiment of the present invention, the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage generated based on the instantaneous load factor specifically includes:

[0017] Obtain the second startup coefficient of the outdoor unit and the maximum opening degree of the outdoor electronic expansion valve. The second startup coefficient is a preset operating parameter.

[0018] Based on the second startup coefficient and the instantaneous load factor, determine the first initial opening degree of the outdoor electronic expansion valve in the low-temperature startup stage.

[0019] Specifically, this embodiment provides another implementation manner for generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage.

[0020] According to an embodiment of the present invention, the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage generated based on the instantaneous load factor specifically includes:

[0021] Obtain the third startup coefficient of the outdoor unit and the maximum opening degree of the indoor electronic expansion valve. The third startup coefficient is a preset operating parameter.

[0022] Based on the third startup coefficient and the instantaneous load factor, determine the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

[0023] Specifically, this embodiment provides yet another implementation manner for generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage.

[0024] According to an embodiment of the present invention, after generating the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the instantaneous load factor, it specifically further includes:

[0025] Obtain the immediate suction pressure of the compressor and a preset pressure threshold;

[0026] Based on the immediate suction pressure being less than the preset pressure threshold, update the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the immediate load factor;

[0027] Continuously obtain the immediate suction pressure, and repeat the above update steps when the immediate suction pressure is less than the preset pressure threshold.

[0028] Specifically, this embodiment provides an implementation manner after generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage.

[0029] According to an embodiment of the present invention, the updating the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the immediate load factor specifically includes:

[0030] Obtain the first immediate operating frequency of the compressor, the first immediate opening degree of the outdoor electronic expansion valve, and the second immediate opening degree of the indoor electronic expansion valve;

[0031] Based on the immediate load factor and the first immediate operating frequency, update the initial operating frequency;

[0032] Based on the immediate load factor and the first immediate opening degree, update the first initial opening degree;

[0033] Based on the immediate load factor and the second immediate opening degree, update the second initial opening degree.

[0034] Specifically, this embodiment provides an implementation manner for updating the initial operating frequency, the first initial opening degree, and the second initial opening degree.

[0035] According to an embodiment of the present invention, the continuously obtaining the immediate suction pressure and repeating the above update steps when the immediate suction pressure is less than the preset pressure threshold specifically further includes:

[0036] When any one of the initial operating frequency, the first initial opening degree, and the second initial opening degree reaches a preset limit threshold, obtain the second immediate operating frequency of the compressor, the third immediate opening degree of the outdoor electronic expansion valve, and the fourth immediate opening degree of the indoor electronic expansion valve;

[0037] Based on the second immediate operating frequency, the third immediate opening degree, and the fourth immediate opening degree, the compressor, the outdoor electronic expansion valve, and the indoor electronic expansion valve continuously operate until the multi-connected air conditioner exits the startup stage.

[0038] Specifically, this embodiment provides an implementation manner of repeating the above update steps when the immediate suction pressure is less than the preset pressure threshold.

[0039] According to an embodiment of the present invention, after generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load factor, it specifically further includes:

[0040] Obtain the immediate exhaust port temperature, immediate exhaust port pressure, and immediate refrigerant pressure of the compressor, and obtain the pressure conversion temperature of the refrigerant based on the immediate exhaust port pressure and the immediate refrigerant pressure;

[0041] Based on the immediate exhaust port temperature and the pressure conversion temperature, determine the startup temperature characteristic;

[0042] Based on the startup temperature characteristic and the immediate load factor, determine the end moment of the startup stage.

[0043] Specifically, this embodiment provides another implementation manner after generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage.

[0044] According to a control device for a multi-connected air conditioner provided in the second aspect of the present invention, it includes:

[0045] A state acquisition module, configured to obtain the immediate conduction state of the four-way reversing valve based on the low-temperature startup signal of the multi-connected air conditioner;

[0046] A coefficient acquisition module, configured to obtain the immediate load factor of the compressor when the immediate conduction state indicates that the four-way reversing valve has completed commutation;

[0047] A strategy generation module, configured to generate a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load factor, and the control strategy at least regulates the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

[0048] According to a multi-connected air conditioner provided in the third aspect of the present invention, it includes: a memory and a processor;

[0049] The memory and the processor complete communication with each other through a bus;

[0050] The memory stores computer instructions that can run on the processor;

[0051] When the processor calls the computer instructions, it can execute the control method of the multi-connected air conditioner described above.

[0052] One or more of the above technical solutions in the present invention have at least one of the following technical effects: A control method, device and multi-connected air conditioner provided by the present invention obtain the immediate load coefficient of the compressor in the low-temperature startup stage, and realize determining the operating parameters in the low-temperature startup stage according to the immediate load coefficient, so that when the outdoor unit of the multi-connected air conditioner is in a low-temperature environment, the outdoor unit and the indoor unit can correct the operating parameters according to the immediate load coefficient, thereby avoiding the phenomena of liquid slugging and oil shortage of the compressor in the low-temperature startup stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0054] Figure 1 is a schematic flowchart of the control method of the multi-connected air conditioner provided by the present invention;

[0055] Figure 2 is a schematic structural diagram of the control device of the multi-connected air conditioner provided by the present invention;

[0056] Figure 3 is a schematic structural diagram of the electronic device provided by the present invention.

[0057] Reference numerals:

[0058] 10, status acquisition module; 20, coefficient acquisition module; 30, policy generation module;

[0059] 810, processor; 820, communication interface; 830, memory; 840, communication bus. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0061] The present invention will be specifically described below in conjunction with the accompanying drawings of the specification. The specific operation methods in the method embodiments can also be applied to the device embodiments or system embodiments. In the description of the present invention, unless otherwise specified, "at least one" includes one or more. "Multiple" means two or more. For example, at least one of A, B, and C includes: A alone, B alone, A and B existing simultaneously, A and C existing simultaneously, B and C existing simultaneously, and A, B, and C existing simultaneously. In the present invention, " / " means "or". For example, A / B can represent A or B; "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0062] The present invention will be specifically described below in conjunction with the specific implementation manners.

[0063] In some specific implementation manners of the present invention, as Figure 1 shown, the present solution provides a control method for a multi-connected air conditioner, including:

[0064] Based on the low-temperature start signal of the multi-connected air conditioner, obtain the instant conduction state of the four-way reversing valve;

[0065] When the instant conduction state indicates that the four-way reversing valve has completed the commutation, obtain the instant load coefficient of the compressor;

[0066] Based on the instant load coefficient, generate a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature start stage. The control strategy at least regulates the initial operation frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve in the low-temperature start stage.

[0067] It should be noted that the current control after the four-way reversing valve commutes in the conventional low-temperature start stage is as follows: After the four-way reversing valve commutes, the compressor still operates at a fixed speed and performs frequency increase operation within a fixed time period until it reaches the maximum frequency in the start stage and then operates to the normal stage. During the start stage, the opening degree of the indoor electronic expansion valve is fixed; the opening degree of the outdoor unit electronic expansion valve is adjusted according to the set opening degree. When the outside ambient temperature is low, the heat exchange of the outdoor unit is poor and the opening degree of the outdoor unit electronic expansion valve is large, resulting in the refrigerant returning to the compressor being in a gas-liquid mixed state or even a liquid state, thus causing liquid hammer phenomenon and oil shortage phenomenon of the compressor.

[0068] Furthermore, the present invention obtains the instant load coefficient of the indoor unit and adjusts and corrects the equipment operation parameters in the low-temperature start stage according to the instant load coefficient, so as to avoid the phenomena of start-up liquid hammer and oil shortage and avoid damage to the compressor when the outdoor unit of the multi-connected air conditioner is in a low-temperature environment.

[0069] In some possible embodiments of the present invention, obtaining the instantaneous load factor of the compressor specifically includes:

[0070] Obtaining the actual operating horsepower and the rated total horsepower of the indoor unit, and determining the horsepower occupancy ratio in the rated total horsepower according to the actual operating horsepower;

[0071] Based on the horsepower occupancy ratio, determining the instantaneous load factor.

[0072] Specifically, this embodiment provides an implementation manner for obtaining the instantaneous load factor of the compressor. The actual operating horsepower and the rated total horsepower of the indoor unit at the current moment are obtained, and then the instantaneous load factor of the indoor unit is determined. Then, the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the first initial opening degree of the indoor electronic expansion valve are adjusted through the instantaneous load factor, realizing the instant correction of the operating parameters according to different opening states and loads of the indoor unit during the startup process of the multi-connected air conditioner, and solving the problems that the compressor runs at a fixed frequency during the existing startup stage, and the opening degrees of the outdoor electronic expansion valve and the indoor electronic expansion valve are fixed, resulting in liquid hammer and oil shortage operation of the compressor.

[0073] In some possible embodiments of the present invention, based on the instantaneous load factor, generating a control strategy for regulating the operation of the multi-connected air conditioner during the low-temperature startup stage specifically includes:

[0074] Obtaining the first startup factor of the compressor. The first startup factor is a preset operating parameter. In the case where the preset value of the first startup factor is not obtained, the first startup factor is the maximum operating frequency of the compressor;

[0075] Based on the first startup factor and the instantaneous load factor, determining the initial operating frequency of the compressor during the low-temperature startup stage.

[0076] Specifically, this embodiment provides an implementation manner for generating a control strategy for regulating the operation of the multi-connected air conditioner during the low-temperature startup stage. During the low-temperature startup stage, the first startup factor of the compressor is preset in advance, and the initial operating frequency of the compressor is determined through the first startup factor and the instantaneous load factor.

[0077] It should be noted that for the selection of the first startup factor of the compressor, the user can set it according to their own needs to form a preset value. In the case where the preset value of the first startup factor is not obtained, by default, the first startup factor is determined according to the maximum operating frequency of the compressor, so as to ensure the calculation of the operating frequency of the compressor during the low-temperature startup stage.

[0078] In some possible embodiments of the present invention, based on the instantaneous load factor, generating a control strategy for regulating the operation of the multi-connected air conditioner during the low-temperature startup stage specifically includes:

[0079] Obtain the second startup coefficient of the outdoor unit and the maximum opening degree of the outdoor electronic expansion valve, where the second startup coefficient is a preset operating parameter;

[0080] Based on the second startup coefficient and the instantaneous load coefficient, determine the first initial opening degree of the outdoor electronic expansion valve during the low-temperature startup stage.

[0081] Specifically, this embodiment provides another implementation manner for generating a control strategy for regulating the operation of a multi-connected air conditioner during the low-temperature startup stage. During the low-temperature startup stage, the first initial opening degree of the outdoor electronic expansion valve is determined by the second startup coefficient of the outdoor unit and the maximum opening degree of the outdoor electronic expansion valve. The second startup coefficient is a relevant coefficient preset by the system during the low-temperature startup stage to adjust the relevant opening degree of the outdoor electronic expansion valve. In practical applications, users can modify the value of the second startup coefficient to adjust the operating parameters of the multi-connected air conditioner during the low-temperature startup stage, and further adjust the corresponding operating effects during the low-temperature startup stage.

[0082] In some possible implementation manners of the present invention, based on the instantaneous load coefficient, a control strategy for regulating the operation of a multi-connected air conditioner during the low-temperature startup stage is generated, which specifically includes:

[0083] Obtain the third startup coefficient of the outdoor unit and the maximum opening degree of the indoor electronic expansion valve, where the third startup coefficient is a preset operating parameter;

[0084] Based on the third startup coefficient and the instantaneous load coefficient, determine the second initial opening degree of the indoor electronic expansion valve during the low-temperature startup stage.

[0085] Specifically, this embodiment provides yet another implementation manner for generating a control strategy for regulating the operation of a multi-connected air conditioner during the low-temperature startup stage. During the low-temperature startup stage, the second initial opening degree of the indoor electronic expansion valve is determined by the third startup coefficient of the indoor unit and the maximum opening degree of the indoor electronic expansion valve. The third startup coefficient is a relevant coefficient preset by the system during the low-temperature startup stage to adjust the relevant opening degree of the indoor electronic expansion valve. In practical applications, users can modify the value of the third startup coefficient to adjust the operating parameters of the multi-connected air conditioner during the low-temperature startup stage, and further adjust the corresponding operating effects during the low-temperature startup stage.

[0086] In some possible implementation manners of the present invention, after generating a control strategy for regulating the operation of a multi-connected air conditioner during the low-temperature startup stage based on the instantaneous load coefficient, it specifically further includes:

[0087] Obtain the instantaneous suction pressure of the compressor and the preset pressure threshold;

[0088] Based on the instantaneous suction pressure being less than the preset pressure threshold, update the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the instantaneous load factor;

[0089] Continuously obtain the instantaneous suction pressure, and repeat the above update steps when the instantaneous suction pressure is less than the preset pressure threshold.

[0090] Specifically, this embodiment provides an implementation manner after generating a control strategy for regulating the operation of a multi-connected air conditioner during the low-temperature startup stage. During the generation process of the control strategy, by obtaining the instantaneous suction pressure of the compressor and the preset pressure threshold, it is determined whether to update the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve, so as to ensure that during the low-temperature startup stage, the setting of operating parameters can more accurately meet the requirements and avoid the situations of compressor liquid slugging and oil starvation operation.

[0091] Furthermore, throughout the entire process of the low-temperature startup stage, continuously and real-time obtain the instantaneous suction pressure of the compressor, so as to ensure that the correction of operating parameters during the low-temperature startup stage is continuously carried out.

[0092] In a possible embodiment, by presetting the preset pressure threshold and real-time obtaining the instantaneous suction pressure of the compressor during the low-temperature startup stage, comparing the instantaneous suction pressure with the preset pressure threshold. When the instantaneous suction pressure is greater than or equal to the preset pressure threshold, it indicates that the operating parameters are normal at this time and no correction is required. When the instantaneous suction pressure is less than the preset pressure threshold, at this time, it is necessary to update the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve, so as to achieve the correction of operating parameters and solve the possible situations of compressor liquid slugging and oil starvation idling caused by the rise of the instantaneous suction pressure.

[0093] In some possible implementation manners of the present invention, updating the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the instantaneous load factor specifically includes:

[0094] Obtain the first instantaneous operating frequency of the compressor, the first instantaneous opening degree of the outdoor electronic expansion valve, and the second instantaneous opening degree of the indoor electronic expansion valve;

[0095] Based on the instantaneous load factor and the first instantaneous operating frequency, update the initial operating frequency;

[0096] Based on the instantaneous load factor and the first instantaneous opening degree, update the first initial opening degree;

[0097] Based on the instantaneous load factor and the second instantaneous opening degree, update the second initial opening degree.

[0098] Specifically, this embodiment provides an implementation manner for updating the initial operating frequency, the first initial opening degree, and the second initial opening degree. According to the first instantaneous operating frequency of the compressor, the first instantaneous opening degree of the outdoor electronic expansion valve, and the second instantaneous opening degree of the indoor electronic expansion valve, combined with the instantaneous load factor, the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve are corrected.

[0099] In some possible implementation manners of the present invention, the instantaneous suction pressure is continuously acquired, and in the case where the instantaneous suction pressure is less than the preset pressure threshold, the above update steps are repeated. Specifically, it further includes:

[0100] In the case where any one of the initial operating frequency, the first initial opening degree, and the second initial opening degree reaches the preset limit threshold, the second instantaneous operating frequency of the compressor, the third instantaneous opening degree of the outdoor electronic expansion valve, and the fourth instantaneous opening degree of the indoor electronic expansion valve are acquired;

[0101] Based on the second instantaneous operating frequency, the third instantaneous opening degree, and the fourth instantaneous opening degree, the compressor, the outdoor electronic expansion valve, and the indoor electronic expansion valve continuously operate until the multi-split air conditioner exits the startup stage.

[0102] Specifically, this embodiment provides an implementation manner for repeating the above update steps in the case where the instantaneous suction pressure is less than the preset pressure threshold. In the case where any one of the initial operating frequency, the first initial opening degree, and the second initial opening degree reaches the preset limit threshold, it indicates that in order to ensure the smooth completion of the low-temperature startup of the multi-split air conditioner, at this time, no further adjustment can be made to the operating parameters of the compressor, the outdoor electronic expansion valve, and the indoor electronic expansion valve. The operation is performed according to the second instantaneous operating frequency of the compressor, the third instantaneous opening degree of the outdoor electronic expansion valve, and the fourth instantaneous opening degree of the indoor electronic expansion valve at the current moment until the multi-split air conditioner exits the low-temperature startup stage.

[0103] In some possible implementation manners of the present invention, after generating a control strategy for regulating the operation of the multi-split air conditioner in the low-temperature startup stage based on the instantaneous load factor, it specifically further includes:

[0104] Acquire the instantaneous temperature at the exhaust port of the compressor, the instantaneous pressure at the exhaust port, and the instantaneous refrigerant pressure, and obtain the pressure conversion temperature of the refrigerant according to the instantaneous pressure at the exhaust port and the instantaneous refrigerant pressure;

[0105] Based on the instantaneous temperature at the exhaust port and the pressure conversion temperature, determine the startup temperature characteristic;

[0106] Based on the startup temperature characteristic and the instantaneous load factor, determine the end moment of the startup stage.

[0107] Specifically, this embodiment provides another implementation manner after generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage. After the multi-connected air conditioner operates for a period of time in the low-temperature startup stage, it is necessary to determine the end moment of the low-temperature startup. The present invention obtains the instantaneous temperature at the compressor exhaust port, the instantaneous pressure at the exhaust port, and the instantaneous refrigerant pressure, determines the startup temperature characteristics of the multi-connected air conditioner according to the instantaneous temperature and pressure conversion temperature at the exhaust port, and then judges the operating condition of the multi-connected air conditioner, and combines the instantaneous load coefficient to determine the end moment of the startup stage.

[0108] In some specific embodiments of the present invention, as Figure 2 shown, this solution provides a control device for a multi-connected air conditioner, including:

[0109] A status acquisition module 10, configured to acquire the instantaneous conduction state of the four-way reversing valve based on the low-temperature startup signal of the multi-connected air conditioner;

[0110] A coefficient acquisition module 20, configured to acquire the instantaneous load coefficient of the compressor when the instantaneous conduction state indicates that the four-way reversing valve has completed commutation;

[0111] A strategy generation module 30, configured to generate a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the instantaneous load coefficient. The control strategy at least adjusts the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

[0112] In some alternative embodiments of the present invention, acquiring the instantaneous load coefficient of the compressor specifically includes:

[0113] Acquiring the actual operating horsepower and the rated total horsepower of the indoor unit, and determining the ratio of the operating horsepower in the rated total horsepower according to the actual operating horsepower;

[0114] Based on the ratio of horsepower, determining the instantaneous load coefficient.

[0115] Specifically, this embodiment provides an implementation manner for acquiring the instantaneous load coefficient of the compressor.

[0116] In some alternative embodiments of the present invention, generating a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the instantaneous load coefficient specifically includes:

[0117] Acquiring the first startup coefficient of the compressor. The first startup coefficient is a preset operating parameter. In the case where the preset value of the first startup coefficient is not obtained, the first startup coefficient is the maximum operating frequency of the compressor;

[0118] Based on the first startup coefficient and the instantaneous load coefficient, determining the initial operating frequency of the compressor in the low-temperature startup stage.

[0119] Specifically, this embodiment provides an implementation manner for generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage.

[0120] In some alternative implementation manners of the present invention, based on the instantaneous load factor, a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage is generated, specifically including:

[0121] Obtain the second startup coefficient of the outdoor unit and the maximum opening degree of the outdoor electronic expansion valve, where the second startup coefficient is a preset operating parameter;

[0122] Based on the second startup coefficient and the instantaneous load factor, determine the first initial opening degree of the outdoor electronic expansion valve in the low-temperature startup stage.

[0123] Specifically, this embodiment provides another implementation manner for generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage.

[0124] In some alternative implementation manners of the present invention, based on the instantaneous load factor, a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage is generated, specifically including:

[0125] Obtain the third startup coefficient of the outdoor unit and the maximum opening degree of the indoor electronic expansion valve, where the third startup coefficient is a preset operating parameter;

[0126] Based on the third startup coefficient and the instantaneous load factor, determine the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

[0127] Specifically, this embodiment provides yet another implementation manner for generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage.

[0128] In some alternative implementation manners of the present invention, after generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage based on the instantaneous load factor, it specifically further includes:

[0129] Obtain the instantaneous suction pressure of the compressor and a preset pressure threshold;

[0130] Based on the instantaneous suction pressure being less than the preset pressure threshold, update the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the instantaneous load factor;

[0131] Continuously obtain the instantaneous suction pressure, and repeat the above update steps when the instantaneous suction pressure is less than the preset pressure threshold.

[0132] Specifically, this embodiment provides an implementation manner after generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage.

[0133] In some alternative embodiments of the present invention, the initial operating frequency, the first initial opening degree, and the second initial opening degree are updated according to the instantaneous load factor, which specifically includes:

[0134] Obtain the first instantaneous operating frequency of the compressor, the first instantaneous opening degree of the outdoor electronic expansion valve, and the second instantaneous opening degree of the indoor electronic expansion valve;

[0135] Update the initial operating frequency based on the instantaneous load factor and the first instantaneous operating frequency;

[0136] Update the first initial opening degree based on the instantaneous load factor and the first instantaneous opening degree;

[0137] Update the second initial opening degree based on the instantaneous load factor and the second instantaneous opening degree.

[0138] Specifically, this embodiment provides an implementation manner for updating the initial operating frequency, the first initial opening degree, and the second initial opening degree.

[0139] In some alternative embodiments of the present invention, continuously obtain the instantaneous suction pressure, and when the instantaneous suction pressure is less than the preset pressure threshold, repeat the above update steps, which specifically further includes:

[0140] When any one of the initial operating frequency, the first initial opening degree, and the second initial opening degree reaches the preset limit threshold, obtain the second instantaneous operating frequency of the compressor, the third instantaneous opening degree of the outdoor electronic expansion valve, and the fourth instantaneous opening degree of the indoor electronic expansion valve;

[0141] Based on the second instantaneous operating frequency, the third instantaneous opening degree, and the fourth instantaneous opening degree, the compressor, the outdoor electronic expansion valve, and the indoor electronic expansion valve continuously operate until the multi-connected air conditioner exits the startup stage.

[0142] Specifically, this embodiment provides an implementation manner for repeating the above update steps when the instantaneous suction pressure is less than the preset pressure threshold.

[0143] In some alternative embodiments of the present invention, after generating a control strategy for adjusting the operation of the multi-connected air conditioner in the low-temperature startup stage based on the instantaneous load factor, it specifically further includes:

[0144] Obtain the instantaneous temperature at the exhaust port of the compressor, the instantaneous pressure at the exhaust port, and the instantaneous refrigerant pressure, and obtain the pressure conversion temperature of the refrigerant according to the instantaneous pressure at the exhaust port and the instantaneous refrigerant pressure;

[0145] Determine the startup temperature characteristic based on the instantaneous temperature at the exhaust port and the pressure conversion temperature;

[0146] Determine the end moment of the startup stage based on the startup temperature characteristic and the instantaneous load factor.

[0147] Specifically, this embodiment provides another implementation manner after generating a control strategy for regulating the operation of a multi-connected air conditioner in the low-temperature startup stage.

[0148] In some specific implementation manners of the present invention, as Figures 1 to 3 shown, this solution provides a multi-connected air conditioner, including: a memory 830 and a processor 810;

[0149] The memory 830 and the processor 810 complete mutual communication through a communication bus 840;

[0150] The memory 830 stores computer instructions that can run on the processor 810;

[0151] When the processor 810 calls the computer instructions, it can execute the control method of the above-mentioned multi-connected air conditioner.

[0152] Figure 3 Illustrates a schematic physical structure diagram of an electronic device, as Figure 3 shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 complete mutual communication through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the multi-connected air conditioner.

[0153] It should be noted that the electronic device in this embodiment can be a server, a PC, or other devices when specifically implemented, as long as its structure includes, as Figure 3 shown, the processor 810, the communication interface 820, the memory 830, and the communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 complete mutual communication through the communication bus 840, and the processor 810 can call the logical instructions in the memory 830 to execute the above method. This embodiment does not limit the specific implementation form of the electronic device.

[0154] Among them, the server can be a single server or a server group. The server group can be centralized or distributed (for example, the server can be a distributed system).

[0155] In a possible embodiment, the server can be local or remote relative to the terminal. For example, the server can access information stored in a user terminal, a database, or any combination thereof via a network.

[0156] As another example, the server can be directly connected to at least one of the user terminal and the database to access the information and / or data stored therein.

[0157] In a possible embodiment, the server can be implemented on a cloud platform; by way of example only, the cloud platform can include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an inter-cloud, a multi-cloud, etc., or any combination thereof.

[0158] In a possible embodiment, the server and the user terminal can be implemented on an electronic device having one or more components in the embodiments of the present invention.

[0159] Furthermore, the network can be used for the exchange of information and / or data.

[0160] In a possible embodiment, one or more components in the interaction scenario (e.g., the server, the user terminal, and the database) can send information and / or data to other components.

[0161] In a possible embodiment, the network can be any type of wired or wireless network, or a combination thereof. By way of example only, the network can include a wired network, a wireless network, an optical fiber network, a telecommunications network, an intranet, the Internet, a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN), a metropolitan area network (MAN), a wide area network (WAN), a public switched telephone network (PSTN), a Bluetooth network, a ZigBee network, or a near field communication (NFC) network, etc., or any combination thereof.

[0162] In a possible embodiment, the network can include one or more network access points. For example, the network can include a wired or wireless network access point, such as a base station and / or a network switching node, and one or more components of the interaction scenario can be connected to the network through the access point to exchange data and / or information.

[0163] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0164] Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0165] In a possible embodiment, the embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the control method of the multi-connected air conditioner provided in the above-mentioned various embodiments.

[0166] In a possible embodiment, the embodiment of the present invention also provides a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided in the above-mentioned various method embodiments.

[0167] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0168] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution, 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 enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a multi-connected air conditioner, characterized in that, Including: Obtain the immediate conduction state of the four-way reversing valve based on the low-temperature startup signal of the multi-connected air conditioner; When the four-way reversing valve is marked as having completed commutation in the immediate conduction state, obtain the immediate load coefficient of the compressor; Generate a control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load coefficient, and the control strategy adjusts at least the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

2. The control method of the multi-connected air conditioner according to claim 1, wherein, The obtaining of the immediate load coefficient of the compressor specifically includes: Obtain the actual operating capacity and the rated total capacity of the indoor unit, and determine the capacity occupancy ratio in the rated total capacity according to the actual operating capacity; Determine the immediate load coefficient based on the capacity occupancy ratio.

3. The control method of the multi-connected air conditioner according to claim 1, wherein, The generating of the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load coefficient specifically includes: Obtain the first startup coefficient of the compressor, where the first startup coefficient is a preset operating parameter, and when the preset value of the first startup coefficient is not obtained, the first startup coefficient is the maximum operating frequency of the compressor; Determine the initial operating frequency of the compressor in the low-temperature startup stage based on the first startup coefficient and the immediate load coefficient.

4. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The generating of the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load coefficient specifically includes: Obtain the second startup coefficient of the outdoor unit and the maximum opening degree of the outdoor electronic expansion valve, where the second startup coefficient is a preset operating parameter; Determine the first initial opening degree of the outdoor electronic expansion valve in the low-temperature startup stage based on the second startup coefficient and the immediate load coefficient.

5. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The generating of the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load coefficient specifically includes: Obtain the third startup coefficient of the outdoor unit and the maximum opening degree of the indoor electronic expansion valve, where the third startup coefficient is a preset operating parameter; Determine the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage based on the third startup coefficient and the immediate load coefficient.

6. The control method of the multi-connected air conditioner according to any one of claims 1 to 5, characterized in that, After generating the control strategy for regulating the operation of the multi-connected air conditioner in the low-temperature startup stage based on the immediate load coefficient, it specifically further includes: Obtain the immediate suction pressure of the compressor and a preset pressure threshold; Based on the immediate suction pressure being less than the preset pressure threshold, update the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the immediate load coefficient; Continuously obtain the immediate suction pressure, and repeat the above update steps when the immediate suction pressure is less than the preset pressure threshold.

7. The control method of the multi-connected air conditioner according to claim 6, wherein, The updating of the initial operating frequency, the first initial opening degree, and the second initial opening degree according to the immediate load coefficient specifically includes: Obtain the first immediate operating frequency of the compressor, the first immediate opening degree of the outdoor electronic expansion valve, and the second immediate opening degree of the indoor electronic expansion valve; Update the initial operating frequency based on the instant load factor and the first instant operating frequency; Update the first initial opening degree based on the instant load factor and the first instant opening degree; Update the second initial opening degree based on the instant load factor and the second instant opening degree.

8. The control method of the multi-connected air conditioner according to claim 6, characterized in that, Continuously obtain the instant suction pressure, and when the instant suction pressure is less than the preset pressure threshold, repeat the above update steps, which specifically further includes: When any one of the initial operating frequency, the first initial opening degree, and the second initial opening degree reaches the preset limit threshold, obtain the second instant operating frequency of the compressor, the third instant opening degree of the outdoor electronic expansion valve, and the fourth instant opening degree of the indoor electronic expansion valve; Based on the second instant operating frequency, the third instant opening degree, and the fourth instant opening degree, the compressor, the outdoor electronic expansion valve, and the indoor electronic expansion valve continuously operate until the multi-connected air conditioner exits the startup stage.

9. The control method of the multi-connected air conditioner according to any one of claims 1 to 5, characterized in that, After generating the control strategy for adjusting the operation of the multi-connected air conditioner in the low-temperature startup stage based on the instant load factor, it specifically further includes: Obtain the instant exhaust port temperature, exhaust port pressure, and refrigerant instant pressure of the compressor, and obtain the pressure conversion temperature of the refrigerant according to the exhaust port pressure and the refrigerant instant pressure; Determine the startup temperature characteristic based on the instant exhaust port temperature and the pressure conversion temperature; Determine the end moment of the startup stage based on the startup temperature characteristic and the instant load factor.

10. A control device for a multi-connected air conditioner, characterized in that, Include: A state acquisition module (10) for obtaining the instant conduction state of the four-way reversing valve based on the low-temperature startup signal of the multi-connected air conditioner; A coefficient acquisition module (20) for obtaining the instant load factor of the compressor when the instant conduction state indicates that the four-way reversing valve has completed commutation; A strategy generation module (30) for generating a control strategy for adjusting the operation of the multi-connected air conditioner in the low-temperature startup stage based on the instant load factor, and the control strategy adjusts at least the initial operating frequency of the compressor, the first initial opening degree of the outdoor electronic expansion valve, and the second initial opening degree of the indoor electronic expansion valve in the low-temperature startup stage.

11. A multi-connected air conditioner, characterized in that, Include: A memory (830) and a processor (810); The memory (830) and the processor (810) communicate with each other through a bus; The memory (830) stores computer instructions that can run on the processor (810); When the processor (810) calls the computer instructions, it can execute the control method of the multi-connected air conditioner according to any one of claims 1 to 9 above.

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