Control method and device for multi-split air conditioner

Abstract

The invention provides a multi-split air conditioner control method and device.The method comprises the steps that under the condition that an outdoor unit of a multi-split air conditioner is started for target time, whether indoor units of the multi-split air conditioner meet the starting condition or not is judged, all the indoor units of the multi-split air conditioner are classified, and a first type of indoor units and a second type of indoor units are determined; and according to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, the opening degree of electronic expansion valves of the first type of indoor units is lowered, and according to the liquid pipe temperature of the second type of indoor units and the second set air outlet temperature, the opening degree of electronic expansion valves of the second type of indoor units is correspondingly adjusted. And the operation of the multi-split air conditioner meets the preset equilibrium constraint condition. According to the method provided by the invention, the control flexibility and effect of the multi-split air conditioner can be effectively improved, so that the operation stability of the multi-split air conditioner is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and particularly relates to a control method and device for a multi-connected air conditioner. Additionally, it also relates to an electronic device, a non-transitory computer-readable storage medium, and a computer program product. Background Art

[0002] In recent years, with the rapid development of Internet of Things technology, the use of various intelligent household appliances has become more and more widespread. For example, multi-connected air conditioners are becoming more and more common in people's daily lives. To improve the stability of multi-connected air conditioners in people's daily lives and ensure their usage effects has become the focus of current research by technicians. Currently, multi-connected air conditioners usually have two installation situations: high head difference or long refrigerant pipes. When the head difference is too large or the refrigerant pipes are long, the refrigerant circulation flow rate of the indoor units far from the outdoor unit is less, resulting in the situation that the set temperature of the user cannot be reached and the unit cannot be started, leading to a poor user experience. Therefore, how to provide a more stable control scheme for multi-connected air conditioners has become an urgent problem to be solved. Summary of the Invention

[0003] The present invention provides a control method for a multi-connected air conditioner to solve the defect that the control scheme of the multi-connected air conditioner in the prior art has high limitations, resulting in poor control processing effects.

[0004] The present invention provides a control method for a multi-connected air conditioner, including: When the outdoor unit of the multi-connected air conditioner has been started for a target time, determine whether the indoor units of the multi-connected air conditioner meet the startup conditions, and classify all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that meet the startup conditions and start to run, and the second type of indoor units are the indoor units that do not meet the startup conditions; According to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, lower the opening degree of the electronic expansion valve of the first type of indoor units, and according to the liquid pipe temperature of the second type of indoor units and the second set air outlet temperature, make corresponding adjustments to the opening degree of the electronic expansion valve of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0005] According to the control method for the multi-connected air conditioner provided by the present invention, the step of lowering the opening degree of the electronic expansion valve of the first type of indoor units according to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature specifically includes: Determine a first temperature difference between the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, and lower the opening degree of the electronic expansion valve of the first type of indoor units according to the first temperature difference and the preset first batch of indoor unit adjustment strategy. Among them, the first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the first type of indoor units; the first batch of indoor unit adjustment strategies include the corresponding relationships between the first opening reduction thresholds of the electronic expansion valves corresponding to each first temperature difference.

[0006] According to the control method of the multi-connected air conditioner provided by the present invention, the step of reducing the opening degree of the electronic expansion valve of the first type of indoor units according to the first temperature difference and the preset first batch of indoor unit adjustment strategies specifically includes: Sort the first type of indoor units from high to low according to the first temperature difference to obtain the sorting result of the first type of indoor units; Filter the sorting result of the first type of indoor units according to a preset temperature difference threshold to determine the first type of target indoor units to be reduced; among them, the first type of target indoor units includes at least one first type of indoor unit; Reduce the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategies.

[0007] According to the control method of the multi-connected air conditioner provided by the present invention, after reducing the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategies, it further includes: When it is detected that the liquid pipe temperature of the first type of target indoor units is less than the set air outlet temperature range corresponding to the first type of target indoor units, remove the corresponding first type of target indoor units from the first type of indoor units to obtain the new first type of indoor units after removing the corresponding first type of target indoor units, and continue to detect whether there are still second type of indoor units in the multi-connected air conditioner that do not meet the startup conditions. When there are still second type of indoor units in the multi-connected air conditioner that do not meet the startup conditions, continue to batch reduce the opening degree of the electronic expansion valve of the new first type of indoor units according to the third temperature difference between the new first type of indoor units and the new first set air outlet temperature and the preset second batch of indoor unit adjustment strategies; Among them, the new first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the first type of indoor units except for the corresponding first type of target indoor units; the second batch of indoor unit adjustment strategies includes the corresponding relationships between the second opening reduction thresholds of the electronic expansion valves corresponding to each third temperature difference.

[0008] According to the control method of the multi-connected air conditioner provided by the present invention, adjusting the opening degree of the electronic expansion valve of the second type of indoor unit according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor unit includes: Determine a second temperature difference between the liquid pipe temperature and the second set air outlet temperature of the second type of indoor unit, and adjust the opening degree of the electronic expansion valve of the second type of indoor unit accordingly; wherein, the second set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the second type of indoor unit.

[0009] According to the control method of the multi-connected air conditioner provided by the present invention, the equilibrium constraint condition is that all indoor units in the multi-connected air conditioner reach the startup condition and start running, or the liquid pipe temperatures of the first type of indoor units are all lowered to be less than the set air outlet temperature range corresponding to the first type of target indoor units.

[0010] The present invention also provides a control device for a multi-connected air conditioner, including: A multi-connected air conditioner classification processing unit, configured to determine whether the indoor units of the multi-connected air conditioner reach the startup condition and classify all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units when the outdoor unit of the multi-connected air conditioner has been started for a target time; wherein, the first type of indoor units are the indoor units that reach the startup condition and start running, and the second type of indoor units are the indoor units that do not reach the startup condition; A control unit of the multi-connected air conditioner, configured to lower the opening degree of the electronic expansion valve of the first type of indoor units according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, and adjust the opening degree of the electronic expansion valve of the second type of indoor units accordingly according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint condition.

[0011] According to the control device of the multi-connected air conditioner provided by the present invention, the control unit of the multi-connected air conditioner is specifically configured to: Determine a first temperature difference between the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, and lower the opening degree of the electronic expansion valve of the first type of indoor units according to the first temperature difference and the preset first batch of indoor unit adjustment strategy; Wherein, the first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the first type of indoor units; the first batch of indoor unit adjustment strategy includes the corresponding relationship between the first opening degree lowering thresholds of the electronic expansion valves corresponding to each first temperature difference.

[0012] According to the control device of the multi-connected air conditioner provided by the present invention, the opening degree of the electronic expansion valve of the first type of indoor unit is lowered according to the first temperature difference and a preset first batch of indoor unit adjustment strategies, which specifically includes: Sort the first type of indoor units from high to low according to the first temperature difference to obtain a sorting result of the first type of indoor units; According to a preset temperature difference threshold, screen the sorting result of the first type of indoor units to determine the first type of target indoor units to be lowered; wherein, the first type of target indoor units includes at least one first type of indoor unit; Lower the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategies.

[0013] According to the control device of the multi-connected air conditioner provided by the present invention, after lowering the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategies, it further includes: When it is detected that the liquid pipe temperature of the first type of target indoor units is less than the set air outlet temperature range corresponding to the first type of target indoor units, remove the corresponding first type of target indoor units from the first type of indoor units to obtain a new first type of indoor units after removing the corresponding first type of target indoor units, and continue to detect whether there are still second type of indoor units that do not meet the startup conditions in the multi-connected air conditioner. When there are still second type of indoor units that do not meet the startup conditions in the multi-connected air conditioner, continue to perform batch lowering of the opening degree of the electronic expansion valve of the new first type of indoor units according to the third temperature difference between the new first type of indoor units and the new first set air outlet temperature and a preset second batch of indoor unit adjustment strategies; Wherein, the new first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit except the corresponding first type of target indoor units in the first type of indoor units; the second batch of indoor unit adjustment strategies includes the corresponding relationship between the second opening degree lowering thresholds of the electronic expansion valves corresponding to each third temperature difference.

[0014] According to the control device of the multi-connected air conditioner provided by the present invention, the control unit of the multi-connected air conditioner is specifically used for: Determine the second temperature difference between the liquid pipe temperature of the second type of indoor units and the second set air outlet temperature, and perform corresponding adjustment on the opening degree of the electronic expansion valve of the second type of indoor units according to the second temperature difference; wherein, the second set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the second type of indoor units.

[0015] According to the control device of the multi-connected air conditioner provided by the present invention, the equilibrium constraint condition is that all indoor units in the multi-connected air conditioner reach the startup condition and start running, or the liquid pipe temperatures of the first type of indoor units are all lowered to be less than the set air outlet temperature range corresponding to the first type of target indoor units.

[0016] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the control method of the multi-connected air conditioner as described in any one of the above.

[0017] The present invention also 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 implements the control method of the multi-connected air conditioner as described in any one of the above.

[0018] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the control method of the multi-connected air conditioner as described in any one of the above.

[0019] The control method of the multi-connected air conditioner provided by the present invention, by determining whether the indoor units of the multi-connected air conditioner reach the startup condition when it is detected that the outdoor unit of the multi-connected air conditioner has been started for a target time, classifying all indoor units of the multi-connected air conditioner, and determining the first type of indoor units and the second type of indoor units; according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, reducing the opening degree of the electronic expansion valve of the first type of indoor units, and according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, making corresponding adjustments to the opening degree of the electronic expansion valve of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint condition, which can effectively improve the flexibility and effect of the control of the multi-connected air conditioner, thereby ensuring the stability of the operation of the multi-connected air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 is a schematic flowchart of the control method of the multi-connected air conditioner provided by the present invention.

[0022] Figure 2 is a schematic structural diagram of the multi-connected air conditioner corresponding to the control method of the multi-connected air conditioner provided by the present invention.

[0023] Figure 3 It is a schematic structural diagram of a control device for a multi-connected air conditioner provided by the present invention.

[0024] Figure 4 It is a schematic structural diagram of an electronic device provided by the present invention. Specific embodiments

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in 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 in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The following Figures 1 - 4 describes the control method and device for a multi-connected air conditioner of the present invention, and details its embodiments.

[0027] Based on the control method for a multi-connected air conditioner described in the present invention below, its embodiments will be described in detail. As Figure 1 shown, it is a schematic flow diagram of the control method for a multi-connected air conditioner provided by the present invention, and the specific implementation process includes the following steps: Step 101: When the outdoor unit of the multi-connected air conditioner has been started for a target time, determine whether the indoor units of the multi-connected air conditioner meet the startup conditions, and classify all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that meet the startup conditions and start to run, and the second type of indoor units are the indoor units that do not meet the startup conditions and do not start to run.

[0028] In the embodiment of the present invention, when the multi-connected air conditioner is in heating mode, the indoor unit is usually set with a starting temperature condition when it is turned on. For example, the liquid pipe temperature T2 of the indoor unit reaches a preset temperature (such as 26°C). If it is lower than this preset temperature, the unit will not turn on, and the multi-connected air conditioner will blow cold air. Therefore, when the outdoor unit of the multi-connected air conditioner has been started for the target time, it is also necessary to compare the liquid pipe temperature T2 of the indoor unit with the preset temperature to determine whether the indoor unit of the multi-connected air conditioner meets the startup condition, and then classify all the indoor units of the multi-connected air conditioner according to the judgment result, so as to distinguish and determine the first type of indoor unit and the second type of indoor unit. That is, after the outdoor unit of the multi-connected air conditioner starts for the target time, it starts to judge whether the indoor unit meets the startup condition. Classify all the indoor units of the multi-connected air conditioner. The first type of indoor unit is the indoor unit that has been operating normally in heating mode, and the second type of indoor unit is the indoor unit that has not reached the air outlet condition and has not been turned on. Among them, the above target time can be set to different values according to the outdoor ambient temperature. The lower the outdoor ambient temperature, the longer the startup target time. For example, when the outdoor ambient temperature is -10°C, the target time can be 2 hours; when the outdoor ambient temperature is -5°C, the target time can be 1 hour; when the outdoor ambient temperature is 0°C, the target time can be 0.5 hour. Open all the electronic expansion valves of the second type of indoor unit that has not been turned on to the maximum opening. Through this step, the present invention can quickly determine whether the indoor unit of the multi-connected air conditioner meets the startup condition, and pre-classify all the indoor units of the multi-connected air conditioner to determine the first type of indoor unit and the second type of indoor unit, which is convenient for subsequent balanced constraint control of the opening degrees of the electronic expansion valves of the first type of indoor unit and the second type of indoor unit.

[0029] It should be noted that the target time can be input through the background configuration method, such as 0.5 hour, 2 hours or 1 hour, and no specific limitation is made here. The multi-connected air conditioner system includes at least one outdoor unit and at least two indoor units. The indoor units can be pre-installed in different rooms indoors, and each indoor unit corresponds to a different electronic expansion valve. The opening degree of this electronic expansion valve is used to control the flow rate of the refrigerant entering the indoor unit. The opening degree of the electronic expansion valve can be controlled by sending a control command. The set temperature can be the desired temperature value input by the user through the operation panel or the air conditioner control terminal, such as 26°C, 30°C, etc., and no specific limitation is made here.

[0030] In the present invention, the structural schematic diagram of the multi-connected air conditioner system can be as Figure 2As shown in the figure, where 1 is a compressor; 2 is a high-pressure sensor; 3 is a four-way valve; 4 is an outdoor heat exchanger group (including a fan / heat exchanger) oil separator; 5 is a liquid pipe stop valve; 6 is an indoor heat exchanger group (including a fan / heat exchanger); 7 is a gas pipe stop valve; 9 is a gas-liquid separator; 9 is a low-pressure sensor; 10 is a suction pipe; 11 is a compressor exhaust port; 12 is a compressor suction port; 13 is a liquid pipe line; 14 is a gas pipe line; 15 is a gas-liquid separator inlet pipe; 16 is an electronic expansion valve of the outdoor unit; 17 is an electronic expansion valve of the indoor unit.

[0031] Step 102: According to the liquid pipe temperature of the first type of indoor unit and the first set air outlet temperature, lower the opening degree of the electronic expansion valve of the first type of indoor unit, and accordingly adjust the opening degree of the electronic expansion valve of the second type of indoor unit according to the liquid pipe temperature of the second type of indoor unit and the second set air outlet temperature, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0032] In the embodiment of the present invention, during the process of lowering the opening degree of the electronic expansion valve of the first type of indoor unit according to the liquid pipe temperature of the first type of indoor unit and the first set air outlet temperature, first, it is necessary to determine the first temperature difference between the liquid pipe temperature of the first type of indoor unit and the first set air outlet temperature, and lower the opening degree of the electronic expansion valve of the first type of indoor unit according to the first temperature difference and the preset first batch of indoor unit adjustment strategy. Wherein, the first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the first type of indoor unit. The first batch of indoor unit adjustment strategy includes the corresponding relationship between the first opening degree lowering thresholds of the electronic expansion valve corresponding to each first temperature difference; the liquid pipe temperature is the liquid pipe temperature corresponding to the first type of indoor unit.

[0033] Among them, the specific implementation process of lowering the opening degree of the electronic expansion valve of the first type of indoor unit according to the first temperature difference and the preset first batch of indoor unit adjustment strategy includes: First, sort the first type of indoor units from high to low according to the first temperature difference to obtain the sorting result of the first type of indoor units. Then, according to the preset temperature difference threshold, screen the sorting result of the first type of indoor units to determine the first type of target indoor units to be lowered. Wherein, the first type of target indoor units includes at least one first type of indoor unit. Lower the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategy.

[0034] In addition, during the process of correspondingly adjusting the opening degree of the electronic expansion valve of the second type of indoor unit according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor unit, first, the second temperature difference between the liquid pipe temperature and the second set air outlet temperature of the second type of indoor unit can be determined, and then the opening degree of the electronic expansion valve of the second type of indoor unit can be correspondingly adjusted according to the second temperature difference, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0035] Among them, the second set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the second type of indoor unit. The equilibrium constraint condition is that all indoor units in the multi-connected air conditioner reach the startup condition and start running, or the liquid pipe temperatures of the first type of indoor units are all lowered to be less than the set air outlet temperature range corresponding to the first type of target indoor units. The equilibrium constraint conditions can be predefined. For example, it can be defined as: Equilibrium constraint condition (1): All the second type of indoor units are heated and turned on; Equilibrium constraint condition (2): The TC2 temperature of the first type of indoor units drops to be less than the range of the current user-set air outlet temperature Taim + 3°C of this indoor unit. Equilibrium constraint condition (1) and equilibrium constraint condition (2) are in an "or" relationship, and reaching either one is sufficient. Through the equilibrium constraint conditions, the present invention balances the output of the overall indoor units of the multi-connected air conditioner, enables the indoor unit with less refrigerant circulation volume to increase the flow rate and start up, that is, ensures the normal startup of the indoor unit with less refrigerant, and improves the operation stability of the multi-connected air conditioner.

[0036] For example, sorting is performed according to the first temperature difference between the liquid pipe temperature T2 of the first type of indoor unit and the currently set air outlet temperature Taim of the user's indoor unit (i.e., the first set air outlet temperature). Among them, the larger the first temperature difference, the higher the ranking. For example: The first type of indoor unit may include Indoor Unit 1, Indoor Unit 2, and Indoor Unit 3. The liquid pipe temperature T2(1) of Indoor Unit 1 = 31.6°C, and currently the Taim of this Indoor Unit 1 = 29°C (i.e., the first set air outlet temperature is 29°C), and the corresponding first temperature difference is 2.6°C. The liquid pipe temperature T2(2) of Indoor Unit 2 = 36.6°C (i.e., the first set air outlet temperature is 36.6°C), and currently the Taim of this Indoor Unit 2 = 28°C, and the corresponding first temperature difference is 8.6°C. The liquid pipe temperature T2(3) of Indoor Unit 3 = 29.6°C, and currently the Taim of this Indoor Unit 3 = 28°C (i.e., the first set air outlet temperature is 28°C), and the corresponding first temperature difference is 1.6°C. Then the sorting is Indoor Unit 2, Indoor Unit 1, and Indoor Unit 3. If the number of indoor units is n, where n is an integer greater than 3, the sorting is also performed according to this method, which will not be elaborated in detail here. It is preset to determine the indoor units that need to be adjusted according to the preset temperature difference thresholds X1, X2, and X3. For example, all the first temperature differences of all the indoor units in the first type of indoor unit are 12.5, 10.9, 10.2, 9.4, 8.7, 7.4, 7.2, 7.0, 5.8, 2.4 respectively. The preset temperature difference threshold X1 value is 10°C, the preset temperature difference threshold X2 value is 8°C, and the preset temperature difference threshold X3 value is 6°C. That is, the indoor units with the first temperature difference greater than 6°C can be adjusted, and the other indoor units will not be adjusted. Among them, the indoor units with the first temperature difference greater than the X1 value are adjusted first, the indoor units with the first temperature difference greater than the X2 value are adjusted secondarily, and the indoor units with the first temperature difference greater than the X3 value are adjusted last.

[0037] Correspondingly, the first batch of indoor unit adjustment strategies include the following corresponding relationships between the first opening reduction thresholds of the electronic expansion valves corresponding to each first temperature difference: For the indoor units with the first temperature difference greater than or equal to the X1 value, the opening PM0 of the electronic expansion valve is reduced by 20% on the current basis. That is, PM1 = PM0 * 80%; PM0 is the initial opening of the electronic expansion valve, and PM1 is the adjusted opening of the electronic expansion valve. For the indoor units with the first temperature difference greater than the X2 value and less than the X1 value, the opening PM0 of the electronic expansion valve is reduced by 15% on the current basis. That is, PM1 = PM0 * 85%. For the indoor units with the first temperature difference greater than the X3 value and less than or equal to the X2 value, the opening PM0 of the electronic expansion valve is reduced by 10% on the current basis. That is, PM1 = PM0 * 90%.

[0038] After the control is completed, the observation time can be set (for example, 3 minutes). During this observation time, two items need to be continuously detected, namely the temperature change of the liquid pipe temperature T2 of the first type of indoor unit and the temperature change of the liquid pipe temperature T2 of the second type of indoor unit. If during this detection time, it is detected that the liquid pipe temperature T2 of a certain indoor unit in the first type of indoor unit drops to less than the range of the current user-set air outlet temperature Taim + 3°C of this indoor unit (i.e., the set air outlet temperature range), the opening degree of the electronic expansion valve is adjusted to (PM0 + PM1) / 2, and then this indoor unit is removed from the first type of indoor unit and the label is defined as Y1(n). If during this detection time, it is detected that the liquid pipe temperature T2 of a certain indoor unit in the second type of indoor unit exceeds the current user-set air outlet temperature Taim + 6°C of this indoor unit (i.e., the corresponding set air outlet temperature range), then the electronic expansion valve is lowered by N steps every 10 seconds. For example, if the current opening degree of the electronic expansion valve of the indoor unit is 350 steps, it is adjusted to: 350 - N every 10 seconds. If the liquid pipe temperature T2 still exceeds the current user-set air outlet temperature Taim + 6°C after 10 seconds, the adjustment continues until the condition of Taim + 3°C < T2 < Taim + 6°C is met, and then the adjustment of the electronic expansion valve of this indoor unit stops. In the subsequent process, if it is detected that Taim + 3°C ≤ TC2, the opening degree of the electronic expansion valve of this indoor unit is immediately increased by N steps. It should be noted that the adjustment of the electronic expansion valve of the second type of indoor unit in the present invention does not conflict with the adjustment of the first type of indoor unit, and the relevant controls are executed separately. Among them, the adjustment of the first type of indoor unit can be executed every 3 minutes, and the second type of indoor unit can be controlled every 10 seconds, which is not specifically limited here. The present invention can intelligently adjust the output of all indoor units, sacrificing the output of some indoor units to ensure the startup of indoor units with less refrigerant flow, thereby ensuring user needs. Among them, N is 10% of the current opening degree of the electronic expansion valve, that is, it is reduced or increased by 10% based on the current opening degree of the electronic expansion valve.

[0039] Further, after reducing the opening degree of the electronic expansion valve of the first type of target indoor unit according to the first temperature difference corresponding to the first type of target indoor unit and the first batch of indoor unit adjustment strategies, it is also possible to detect whether the liquid pipe temperature of the first type of target indoor unit is lower than the set air outlet temperature range corresponding to the first type of target indoor unit. When it is detected that the liquid pipe temperature of the first type of target indoor unit is lower than the set air outlet temperature range corresponding to the first type of target indoor unit, the corresponding first type of target indoor unit is removed from the first type of indoor units, and a new first type of indoor units after removing the corresponding first type of target indoor unit is obtained. Then, continue to detect whether there are still second type of indoor units in the multi-connected air conditioner that do not meet the startup conditions. When there are still second type of indoor units in the multi-connected air conditioner that do not meet the startup conditions, continue to batch down the opening degree of the electronic expansion valve of the new first type of indoor units according to the third temperature difference between the new first type of indoor units after removing the corresponding first type of target indoor unit and the new first set air outlet temperature and the preset second batch of indoor unit adjustment strategies. Wherein, the new first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit other than the corresponding first type of target indoor unit in the first type of indoor units; the second batch of indoor unit adjustment strategies includes the corresponding relationship between the second opening degree reduction thresholds of the electronic expansion valves corresponding to each third temperature difference.

[0040] The second batch of indoor unit adjustment strategies includes the corresponding relationship between the second opening degree reduction thresholds of the electronic expansion valves corresponding to each third temperature difference as follows: If at the end of the detection time, there are still unstarted indoor units among the second type of indoor units, then obtain the third temperature difference between the liquid pipe temperature T2 of all indoor units except the first batch of indoor units Y1(n) and the second type of indoor units and the current user indoor unit set air outlet temperature Taim. And sort the temperature differences of this part of indoor units according to the third temperature difference. Determine the indoor units to be adjusted according to the preset temperature differences X1, X2, and X3. If the third temperature difference of the indoor unit is greater than the X1 value, the opening degree of the electronic expansion valve of the indoor unit is reduced by 20% on the basis of the current PM1. That is, PM2 = PM1 * 80%. If the third temperature difference is greater than the X2 value and less than the X1 value, the opening degree of the electronic expansion valve of the indoor unit is reduced by 15% on the basis of the current PM1. That is, PM2 = PM1 * 85%. If the third temperature difference is greater than the X3 value and less than the X2 value, the opening degree of the electronic expansion valve of the indoor unit is reduced by 10% on the basis of the current PM1. That is, PM2 = PM1 * 90%.

[0041] Set an observation time of 3 minutes (e.g., 3 minutes) after the control is completed. During this detection time, two items need to be continuously detected, namely the change in the liquid pipe temperature T2 of the first type of indoor unit and the change in the liquid pipe temperature T2 of the second type of indoor unit. If during this detection time, it is detected that the liquid pipe temperature TC2 of a certain indoor unit of the first type drops to less than the range of the current user-set air outlet temperature Taim + 3°C of this indoor unit (i.e., the set air outlet temperature range), adjust the opening of the electronic expansion valve to (PM1 + PM2) / 2. Remove this indoor unit from the first type of indoor unit and define the label as Y2(n). If during this detection time, it is detected that the liquid pipe temperature TC2 of the second type of indoor unit exceeds the current user-set air outlet temperature Taim + 6°C of this indoor unit, then lower the electronic expansion valve by N steps every 10 seconds. If the opening of the electronic expansion valve of the current indoor unit is 350 steps, then adjust it to: 350 - N every 10 seconds. If T2 still exceeds the current user-set air outlet temperature Taim + 6°C after 10 seconds, continue to adjust. When the condition Taim + 3°C < T2 < Taim + 6°C is met, the adjustment of the electronic expansion valve of this indoor unit stops. In the following process, if it is detected that Taim + 3°C > T2, immediately raise the valve of this indoor unit by N steps. Detect once every 10 seconds. If Taim + 3°C > TC2 still holds, continue to raise it by N steps until the condition Taim + 3°C < TC2 < Taim + 6°C is met, and the adjustment of the electronic expansion valve of this indoor unit stops. If it is continuously detected that there are still unpowered indoor units among the second type of indoor units, continue to obtain the temperature difference between the liquid pipe temperature T2 of the indoor units in the first type of indoor units and the current user-set air outlet temperature Taim of the indoor units. Reorder according to the temperature difference and determine the indoor units that need to reduce the opening of the electronic expansion valve. Executing according to the current control, the number of indoor units that can meet the preset temperature difference requirement will become fewer and fewer. The present invention determines the required output size of the current indoor unit based on the temperature difference between the indoor ambient temperature and the user-set temperature, sorts the outputs according to this temperature difference, preferentially adjusts the indoor units with smaller required outputs, and adjusts the electronic expansion valve of this indoor unit according to the set conditions, so that the flow of the over-output indoor units is diverted to the indoor units with smaller flow rates, and at the same time, these indoor units will not be over-adjusted and shut down.

[0042] The control method of the multi-connected air conditioner provided by the present invention determines whether the indoor units of the multi-connected air conditioner reach the startup condition when it is detected that the outdoor unit of the multi-connected air conditioner has been started for the target time, classifies all the indoor units of the multi-connected air conditioner, and determines the first type of indoor units and the second type of indoor units; according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, the opening degree of the electronic expansion valve of the first type of indoor units is lowered, and according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, the opening degree of the electronic expansion valve of the second type of indoor units is adjusted accordingly, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions, which can effectively improve the flexibility and effect of the control of the multi-connected air conditioner, thereby ensuring the stability of the operation of the multi-connected air conditioner.

[0043] The control device of the multi-connected air conditioner provided by the present invention will be described below. The control device of the multi-connected air conditioner described below can be mutually referred to the control method of the multi-connected air conditioner described above. Refer to Figure 3 As shown, it is a schematic structural diagram of the control device of the multi-connected air conditioner provided by the present invention. The control device of the multi-connected air conditioner described in the present invention specifically includes the following parts: The multi-connected air conditioner classification processing unit 301 is used to determine whether the indoor units of the multi-connected air conditioner reach the startup condition when the outdoor unit of the multi-connected air conditioner has been started for the target time, classify all the indoor units of the multi-connected air conditioner, and determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that reach the startup condition and start to operate, and the second type of indoor units are the indoor units that do not reach the startup condition.

[0044] The control unit 302 of the multi-connected air conditioner is used to lower the opening degree of the electronic expansion valve of the first type of indoor units according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, and adjust the opening degree of the electronic expansion valve of the second type of indoor units accordingly according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0045] According to the control device of the multi-connected air conditioner provided by the present invention, the control unit of the multi-connected air conditioner is specifically used for: Determine the first temperature difference between the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, and lower the opening degree of the electronic expansion valve of the first type of indoor units according to the first temperature difference and the preset first batch of indoor unit adjustment strategy; Wherein, the first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the first type of indoor units; the first batch of indoor unit adjustment strategy includes the corresponding relationship between the first opening degree lowering thresholds of the electronic expansion valve corresponding to each first temperature difference.

[0046] For the control device of the multi-connected air conditioner provided by the present invention, the opening degree of the electronic expansion valve of the first type of indoor unit is lowered according to the first temperature difference and a preset first batch of indoor unit adjustment strategies, which specifically includes: Sort the first type of indoor units according to the first temperature difference from high to low to obtain the sorting result of the first type of indoor units; Filter the sorting result of the first type of indoor units according to a preset temperature difference threshold to determine the first type of target indoor units to be lowered; wherein, the first type of target indoor units includes at least one first type of indoor unit; Lower the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategies.

[0047] For the control device of the multi-connected air conditioner provided by the present invention, after lowering the opening degree of the electronic expansion valve of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategies, it further includes: When it is detected that the liquid pipe temperature of the first type of target indoor units is less than the set air outlet temperature range corresponding to the first type of target indoor units, remove the corresponding first type of target indoor units from the first type of indoor units to obtain a new first type of indoor units after removing the corresponding first type of target indoor units, and continue to detect whether there are still second type of indoor units that do not meet the startup conditions in the multi-connected air conditioner. When there are still second type of indoor units that do not meet the startup conditions in the multi-connected air conditioner, continue to batch-lower the opening degree of the electronic expansion valve of the new first type of indoor units according to the third temperature difference between the new first type of indoor units and the new first set air outlet temperature and a preset second batch of indoor unit adjustment strategies; Wherein, the new first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit other than the corresponding first type of target indoor units in the first type of indoor units; the second batch of indoor unit adjustment strategies includes the corresponding relationship between the second opening degree lowering thresholds of the electronic expansion valves corresponding to each third temperature difference.

[0048] For the control device of the multi-connected air conditioner provided by the present invention, the control unit of the multi-connected air conditioner is specifically used for: Determine a second temperature difference between the liquid pipe temperature of the second type of indoor unit and a second set air outlet temperature, and correspondingly adjust the opening degree of the electronic expansion valve of the second type of indoor unit according to the second temperature difference; wherein, the second set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the second type of indoor unit.

[0049] According to the control device of the multi-connected air conditioner provided by the present invention, the equilibrium constraint condition is that all indoor units in the multi-connected air conditioner reach the startup condition and start running, or the liquid pipe temperatures of the first type of indoor units are all lowered to be less than the set air outlet temperature range corresponding to the first type of target indoor units.

[0050] The control device of the multi-connected air conditioner provided by the present invention, when it is detected that the outdoor unit of the multi-connected air conditioner has started for a target time, determines whether the indoor units of the multi-connected air conditioner reach the startup condition, classifies all indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, lower the opening degree of the electronic expansion valve of the first type of indoor units, and correspondingly adjust the opening degree of the electronic expansion valve of the second type of indoor units according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint condition, which can effectively improve the flexibility and effect of the control of the multi-connected air conditioner, thereby ensuring the stability of the operation of the multi-connected air conditioner.

[0051] Figure 4 Illustrates a schematic physical structure diagram of an electronic device, such as Figure 4As shown, the electronic device (i.e., a computer device or a server) may include: a processor 401, a communications interface 404, a memory 402, and a communication bus 403. Among them, the processor 401, the communications interface 404, and the memory 402 complete communication with each other through the communication bus 403. The processor 401 may call the logical instructions in the memory 402 to execute the control method for a multi-connected air conditioner. The method includes: when the outdoor unit of the multi-connected air conditioner has been started for a target time, determining whether the indoor units of the multi-connected air conditioner meet the startup conditions, and classifying all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; where the first type of indoor units are the indoor units that meet the startup conditions and have started to operate, and the second type of indoor units are the indoor units that do not meet the startup conditions; according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, reducing the opening degree of the electronic expansion valve of the first type of indoor units, and according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, making corresponding adjustments to the opening degree of the electronic expansion valve of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0052] In addition, when the logical instructions in the above-mentioned memory 402 are implemented in the form of software function units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, 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 may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing 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.

[0053] On the other hand, the present application also provides a computer program product, which includes a computer program that can be stored on a computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the multi-connected air conditioner provided by the above-mentioned various methods. The method includes: when the outdoor unit of the multi-connected air conditioner has been started for a target time, determining whether the indoor units of the multi-connected air conditioner meet the startup conditions, and classifying all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that meet the startup conditions and have been started and operated, and the second type of indoor units are the indoor units that do not meet the startup conditions; according to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, reducing the opening degree of the electronic expansion valve of the first type of indoor units, and according to the liquid pipe temperature of the second type of indoor units and the second set air outlet temperature, making corresponding adjustments to the opening degree of the electronic expansion valve of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0054] On the other hand, the present application also provides a computer-readable storage medium, which includes a stored program. When the program runs, it executes the control method of the multi-connected air conditioner provided by the above-mentioned various methods. The method includes: when the outdoor unit of the multi-connected air conditioner has been started for a target time, determining whether the indoor units of the multi-connected air conditioner meet the startup conditions, and classifying all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that meet the startup conditions and have been started and operated, and the second type of indoor units are the indoor units that do not meet the startup conditions; according to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, reducing the opening degree of the electronic expansion valve of the first type of indoor units, and according to the liquid pipe temperature of the second type of indoor units and the second set air outlet temperature, making corresponding adjustments to the opening degree of the electronic expansion valve of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

[0055] 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 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. Those of ordinary skill in the art can understand and implement it without creative labor.

[0056] 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 essence of the above technical solution, 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, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application 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 recorded in the foregoing embodiments, or perform equivalent replacements on 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 application.

Claims

1. A control method for a multi-connected air conditioner, characterized in that, Including: When the outdoor unit of the multi-connected air conditioner has started for the target time, determine whether the indoor units of the multi-connected air conditioner meet the startup conditions, and classify all the indoor units of the multi-connected air conditioner to determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that meet the startup conditions and start running, and the second type of indoor units are the indoor units that do not meet the startup conditions; According to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, lower the opening degree of the electronic expansion valves of the first type of indoor units, and according to the liquid pipe temperature of the second type of indoor units and the second set air outlet temperature, make corresponding adjustments to the opening degree of the electronic expansion valves of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

2. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The step of lowering the opening degree of the electronic expansion valves of the first type of indoor units according to the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature specifically includes: Determine the first temperature difference between the liquid pipe temperature of the first type of indoor units and the first set air outlet temperature, and lower the opening degree of the electronic expansion valves of the first type of indoor units according to the first temperature difference and the preset first batch of indoor unit adjustment strategy; Wherein, the first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the first type of indoor units; the first batch of indoor unit adjustment strategy includes the corresponding relationship between the first opening degree lowering thresholds of the electronic expansion valves corresponding to each first temperature difference.

3. The control method of the multi-connected air conditioner according to claim 2, characterized in that, The step of lowering the opening degree of the electronic expansion valves of the first type of indoor units according to the first temperature difference and the preset first batch of indoor unit adjustment strategy specifically includes: Sort the first type of indoor units from high to low according to the first temperature difference to obtain the sorting result of the first type of indoor units; According to the preset temperature difference threshold, screen the sorting result of the first type of indoor units to determine the first type of target indoor units to be lowered; wherein, the first type of target indoor units includes at least one first type of indoor unit; Lower the opening degree of the electronic expansion valves of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategy.

4. The control method of the multi-connected air conditioner according to claim 3, characterized in that, After lowering the opening degree of the electronic expansion valves of the first type of target indoor units according to the first temperature difference corresponding to the first type of target indoor units and the first batch of indoor unit adjustment strategy, it further includes: When it is detected that the liquid pipe temperature of the first type of target indoor unit is lower than the set air outlet temperature range corresponding to the first type of target indoor unit, remove the corresponding first type of target indoor unit from the first type of indoor units, obtain a new first type of indoor units after removing the corresponding first type of target indoor unit, and continue to detect whether there are still second type of indoor units in the multi-connected air conditioner that do not meet the startup conditions. When there are still second type of indoor units in the multi-connected air conditioner that do not meet the startup conditions, continue to batch down-regulate the opening degree of the electronic expansion valve of the new first type of indoor units according to the third temperature difference between the new first type of indoor units after removing the corresponding first type of target indoor unit and the new first set air outlet temperature and the preset second batch of indoor unit adjustment strategy; Wherein, the new first set air outlet temperature is the set air outlet temperature corresponding to each indoor unit other than the corresponding first type of target indoor unit in the first type of indoor units; the second batch of indoor unit adjustment strategy includes the corresponding relationship between the second opening degree down-regulation thresholds of the electronic expansion valves corresponding to each third temperature difference.

5. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The corresponding adjustment of the opening degree of the electronic expansion valve of the second type of indoor units according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units includes: Determine the second temperature difference between the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, and perform corresponding adjustment on the opening degree of the electronic expansion valve of the second type of indoor units according to the second temperature difference; wherein, the second set air outlet temperature is the set air outlet temperature corresponding to each indoor unit in the second type of indoor units.

6. The control method of the multi-connected air conditioner according to claim 1, wherein The equilibrium constraint condition is that all indoor units in the multi-connected air conditioner reach the startup conditions and start running, or the liquid pipe temperatures of all the first type of indoor units are all down-regulated to be lower than the set air outlet temperature range corresponding to the first type of target indoor units.

7. A control device for a multi-connected air conditioner, characterized in that, Including: A multi-connected air conditioner classification processing unit, configured to determine whether the indoor units of the multi-connected air conditioner meet the startup conditions and classify all the indoor units of the multi-connected air conditioner when the outdoor unit of the multi-connected air conditioner has been started for a target time, and determine the first type of indoor units and the second type of indoor units; wherein, the first type of indoor units are the indoor units that meet the startup conditions and start running, and the second type of indoor units are the indoor units that do not meet the startup conditions; A control unit of the multi-connected air conditioner, configured to down-regulate the opening degree of the electronic expansion valve of the first type of indoor units according to the liquid pipe temperature and the first set air outlet temperature of the first type of indoor units, and perform corresponding adjustment on the opening degree of the electronic expansion valve of the second type of indoor units according to the liquid pipe temperature and the second set air outlet temperature of the second type of indoor units, so that the operation of the multi-connected air conditioner meets the preset equilibrium constraint conditions.

8. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, the steps of the control method of the multi-connected air conditioner according to any one of claims 1 to 6 are implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the control method of the multi-connected air conditioner according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the control method of the multi-connected air conditioner according to any one of claims 1 to 6.

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