CN115962553A - Control method and device for outdoor unit module and multi-split system - Google Patents
Control method and device for outdoor unit module and multi-split system Download PDFInfo
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Abstract
The invention discloses a control method and device of an outdoor unit module and a multi-split system. Wherein, the method comprises the following steps: acquiring a target heat exchange temperature difference and an actual heat exchange temperature difference of each outdoor unit module; if at least one outdoor unit module meets: if the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioner system; if at least one outdoor unit module: and if the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature difference, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air-conditioning system. The invention controls the modularized starting quantity and capacity according to the heat exchange temperature difference of the modules, so that the operation capacity and the energy efficiency of the outdoor unit module are in the optimal heat exchange state.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a method and a device for controlling an outdoor unit module and a multi-split air conditioner system.
Background
For the control mode of multiple modules in the multi-split system, a mode of temperature difference between the set temperature of the indoor side and the indoor environment temperature is generally adopted to control the multiple modules to start simultaneously, and the method of temperature rise or temperature drop of the indoor side is rapidly realized. However, in the actual use process of the multi-module unit, especially in the modularized multi-split air conditioner, due to installation and external environmental factors, the operation capabilities of different module units deviate from the capacity of the units, and therefore the problem of insufficient overall capability or low energy efficiency is caused.
Aiming at the problem that the actual operation capacity of a modularized unit is not matched with the capacity of the modularized unit in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a control method and device of an outdoor unit module and a multi-split system, and aims to solve the problem that the actual operation capacity of a modular unit is not matched with the capacity of the modular unit in the prior art.
In order to solve the technical problem, the invention provides a control method of an outdoor unit module, wherein the method comprises the following steps: acquiring target heat exchange temperature difference of each outdoor unit module; acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time; if the actual heat exchange temperature difference of each outdoor unit module is equal to the target heat exchange temperature difference, maintaining the current state of the multi-split air conditioner system; if at least one outdoor unit module meets a first preset condition: if the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioner system; if at least one outdoor unit module meets a second preset condition: and if the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature differences, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air-conditioning system.
Further, obtaining the target heat exchange temperature difference of each outdoor unit module comprises: detecting the outdoor environment temperature and the indoor environment temperature of each outdoor unit module, and acquiring the starting rate of the indoor units and the preset temperature of the indoor units in the starting state; determining initial target heat exchange temperature difference delta t corresponding to each outdoor unit module according to the outdoor environment temperature, the indoor unit on-time rate and the preset temperature n And a correction value Δ t 0 (ii) a According to the initial target heat exchange temperature difference delta t of each outdoor unit module n And a correction value Δ t 0 Calculating to obtain a target heat exchange temperature difference delta tx of each outdoor unit module; wherein Δ tx = Δ t n +Δt 0 。
Further, the actual heat exchange temperature difference of each outdoor unit module is obtained after the operation is performed for a preset time, and the method comprises the following steps: after the operation is carried out for a preset time, detecting the inlet refrigerant temperature and the outlet refrigerant temperature of the outdoor heat exchangers of the outdoor unit modules; calculating actual heat exchange temperature difference delta T of each outdoor unit module according to the inlet refrigerant temperature and the outlet refrigerant temperature n (ii) a Wherein, delta T n = inlet refrigerant temperature-outlet refrigerant temperature.
Further, if at least one outdoor unit module meets a first preset condition: if the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioning system, wherein the method comprises the following steps:
if only one outdoor unit module meets a first preset condition, taking the outdoor unit module as a target outdoor unit module, and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioner system;
if a plurality of outdoor unit modules meet a first preset condition, selecting an outdoor unit module with the largest capacity from the plurality of outdoor unit modules, or randomly selecting one outdoor unit module under the condition that the capacities of the plurality of outdoor unit modules are the same; and taking the selected outdoor unit module as a target outdoor unit module, and executing a first control strategy to reduce the total starting capacity of the multi-split air-conditioning system.
Further, determining a target outdoor unit module and executing a first control strategy to reduce the total startup capacity of the multi-split air-conditioning system comprises: judging whether an outdoor unit module with the capacity smaller than that of the target outdoor unit module exists in outdoor unit modules which are not started; if yes, closing the target outdoor unit module, and opening the outdoor unit module with the largest capacity in the outdoor unit modules with smaller capacity; if not, determining whether the number of the modules in the current starting state is greater than 1, if so, closing the target outdoor unit module, otherwise, maintaining the current state of the multi-split air-conditioning system, and updating the correction value of the target outdoor unit module to delta t 0 = t; and t is the difference value between the current actual heat exchange temperature difference of the target outdoor unit module and the initial target heat exchange temperature difference, and t is less than 0.
Further, if at least one outdoor unit module meets a second preset condition: the actual heat exchange temperature difference is greater than the target heat exchange temperature difference, and the actual heat exchange temperature differences of other outdoor unit modules are equal to or less than the target heat exchange temperature differences, then the target outdoor unit module is determined and a second control strategy is executed to increase the total starting capacity of the multi-split air-conditioning system, and the method comprises the following steps: if only one outdoor unit module meets a second preset condition, executing a second control strategy on the outdoor unit module to increase the total starting capacity of the multi-split air conditioning system; if a plurality of outdoor unit modules meet a second preset condition, selecting an outdoor unit module with the minimum capacity from the plurality of outdoor unit modules, or randomly selecting one outdoor unit module under the condition that the capacities of the plurality of outdoor unit modules are the same; and executing a second control strategy on the selected outdoor unit module to increase the total starting capacity of the multi-split air-conditioning system.
Further, determining a target outdoor unit module and executing a secondControlling a strategy to increase the total startup capacity of the multi-split system, wherein the strategy comprises the following steps: judging whether an outdoor unit module with the capacity larger than that of the target outdoor unit module exists in the outdoor unit modules which are not started; if yes, closing the target outdoor unit module, and opening the outdoor unit module with the minimum capacity in the outdoor unit modules with larger capacity; if not, determining whether the number of the modules in the current starting state is equal to the preset maximum number of the modules, if not, determining the module with the minimum capacity in the outdoor unit modules which are not started, and starting the module with the minimum capacity; if yes, maintaining the current state of the multi-split system, and updating the correction value of the target outdoor unit module to delta t 0 = t'; wherein t 'is the difference value between the current actual heat exchange temperature difference and the initial target heat exchange temperature difference of the target outdoor unit module, and t' is greater than 0.
Further, the method further comprises: monitoring whether the number of outdoor unit modules in the starting state in the multi-split system changes or not; and/or monitoring whether the total startup capacity of the multi-split system changes or not; and/or monitoring whether the target heat exchange temperature difference of each outdoor unit module changes; if one of the monitoring results is changed, triggering again after a preset time interval: acquiring a target heat exchange temperature difference of each outdoor unit module; and acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time.
The present invention also provides a control apparatus of an outdoor unit module, wherein the apparatus comprises: the acquisition module is used for acquiring the target heat exchange temperature difference of each outdoor unit module; acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time; the first processing module is used for processing the outdoor unit module according with a first preset condition: under the condition that the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air-conditioning system; the second processing module is used for processing the outdoor unit module according with a second preset condition: under the condition that the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature differences, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air-conditioning system; and the third processing module is used for maintaining the current state of the multi-split air-conditioning system under the condition that the actual heat exchange temperature difference of each outdoor unit module is equal to the target heat exchange temperature difference.
The invention also provides a multi-split system, wherein the multi-split system comprises the control device of the outdoor unit module.
The invention also provides a computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method as described above.
By applying the technical scheme of the invention, from the perspective of the actual heat exchange effect of each outdoor unit module, the modularized starting number and capacity are controlled according to the heat exchange temperature difference of the outdoor unit modules, so that the operation capacity and the energy efficiency of the outdoor unit modules are in the optimal heat exchange state. The influence of objective factors such as installation and outdoor environment on the operation module is avoided.
Drawings
Fig. 1 is a flowchart of a control method of an outdoor unit module according to an embodiment of the present invention;
fig. 2 is a control flowchart of a multi-split system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a control apparatus of an outdoor unit module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "the plural" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of another identical element in a good or device that comprises the element.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of a method for controlling an outdoor unit module according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S101, acquiring target heat exchange temperature difference of each outdoor unit module; acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time;
step S102, if the actual heat exchange temperature difference of each outdoor unit module is equal to the target heat exchange temperature difference, maintaining the current state of the multi-split air conditioning system;
step S103, if at least one outdoor unit module meets a first preset condition: the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference, and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, the target outdoor unit module is determined, and a first control strategy is executed to reduce the total starting capacity of the multi-split air-conditioning system;
step S104, if at least one outdoor unit module meets a second preset condition: and if the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature differences, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air-conditioning system.
In this embodiment, from the perspective of the actual heat exchange effect of each outdoor unit module, the number and capacity of the modular start-up are controlled according to the heat exchange temperature difference of the outdoor unit modules, so that the operation capacity and energy efficiency of the outdoor unit modules are both in the optimal heat exchange state. The influence of objective factors such as installation and outdoor environment on the operation module is avoided.
When the target heat exchange temperature difference of each outdoor unit module is obtained, the following preferred embodiments can be implemented: detecting the outdoor environment temperature and the indoor environment temperature of each outdoor unit module, and acquiring the starting rate of the indoor units and the preset temperature of the indoor units in the starting state; determining the initial target heat exchange temperature difference delta t corresponding to each outdoor unit module according to the outdoor environment temperature, the indoor unit on-time rate and the preset temperature n And a correction value Δ t 0 (ii) a According to the initial target heat exchange temperature difference delta t of each outdoor unit module n And a correction value Δ t 0 Calculating to obtain a target heat exchange temperature difference delta tx of each outdoor unit module; wherein Δ tx = Δ t n +Δt 0 . It should be noted that, in this embodiment, the outdoor ambient temperature and the indoor ambient temperature are set in advance, and the turn-on rate and the turn-on state of the indoor unit are obtainedThe temperature difference delta t between the preset temperature of the indoor unit and the initial target heat exchange temperature n Correction value Deltat 0 The corresponding relationship of (2). Because the installation environments of different outdoor unit modules have differences, the detected outdoor environment temperature and the corrected value have differences, and therefore the target heat exchange temperature differences of the different outdoor unit modules have differences.
The actual heat exchange temperature difference of each outdoor unit module is obtained after the operation is carried out for a preset time, and the method can be realized by the following preferred embodiment: after the operation is carried out for a preset time, detecting the inlet refrigerant temperature and the outlet refrigerant temperature of the outdoor heat exchangers of the outdoor unit modules; calculating to obtain the actual heat exchange temperature difference delta T of each outdoor unit module according to the temperature of the inlet refrigerant and the temperature of the outlet refrigerant n (ii) a Wherein, delta T n = inlet refrigerant temperature-outlet refrigerant temperature. Based on this, can accurately obtain the actual heat transfer difference in temperature of each off-premises station module, actual heat transfer difference in temperature and target heat transfer difference in temperature are used for confirming whether start-up module quantity and heat transfer demand match, can avoid the influence of objective factors such as installation, outdoor environment to operation module.
After the actual heat exchange temperature difference and the target heat exchange temperature difference of the outdoor unit module are determined, the control of the modularized starting number and capacity is realized according to the actual heat exchange temperature difference and the target heat exchange temperature difference.
1) The first case is: at least one outdoor unit module meets a first preset condition: the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference, and the actual heat exchange temperature difference of other outdoor unit modules is equal to the target heat exchange temperature difference. The control strategy in this case is: and determining a target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split system.
The target outdoor unit module is determined, and the following can be realized according to the situation:
if only one outdoor unit module meets a first preset condition, taking the outdoor unit module as a target outdoor unit module, and executing a first control strategy to reduce the total starting capacity of the multi-split air-conditioning system;
if a plurality of outdoor unit modules meet a first preset condition, selecting an outdoor unit module with the largest capacity from the plurality of outdoor unit modules, or randomly selecting one outdoor unit module under the condition that the capacities of the plurality of outdoor unit modules are the same; and taking the selected outdoor unit module as a target outdoor unit module, and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioner system.
After the target outdoor unit module is determined, executing a first control strategy to reduce the total starting capacity of the multi-split system, specifically comprising: judging whether an outdoor unit module with the capacity smaller than that of a target outdoor unit module exists in the outdoor unit modules which are not started; if yes, closing the target outdoor unit module, and opening the outdoor unit module with the largest capacity in the outdoor unit modules with smaller capacity; if not, determining whether the number of the modules in the current starting state is greater than 1, if so, closing the target outdoor unit module, otherwise, maintaining the current state of the multi-split air-conditioning system, and updating the correction value of the target outdoor unit module to delta t 0 = t; and t is the difference value between the current actual heat exchange temperature difference of the target outdoor unit module and the initial target heat exchange temperature difference, and t is less than 0. Based on the method, the modularized starting number and capacity are controlled according to the heat exchange temperature difference of the outdoor unit module, so that the operation capacity and the energy efficiency of the outdoor unit module are in the optimal heat exchange state.
2) The second case is: at least one outdoor unit module meets a second preset condition: the actual heat exchange temperature difference is larger than the target heat exchange temperature difference, and the actual heat exchange temperature difference of other outdoor unit modules is equal to or smaller than the target heat exchange temperature difference. The control strategy in this case is: and determining a target outdoor unit module and executing a second control strategy to increase the total startup capacity of the multi-split air-conditioning system.
The target outdoor unit module is determined, and the following can be realized according to the situation:
if only one outdoor unit module meets a second preset condition, executing a second control strategy on the outdoor unit module to increase the total starting capacity of the multi-split system;
if a plurality of outdoor unit modules meet a second preset condition, selecting an outdoor unit module with the minimum capacity from the plurality of outdoor unit modules, or randomly selecting one outdoor unit module under the condition that the capacities of the plurality of outdoor unit modules are the same; and executing a second control strategy on the selected outdoor unit module to increase the total startup capacity of the multi-split air-conditioning system.
After the target outdoor unit module is determined, executing a second control strategy to reduce the total starting capacity of the multi-split system, specifically comprising: judging whether an outdoor unit module with capacity larger than that of a target outdoor unit module exists in outdoor unit modules which are not started; if yes, closing the target outdoor unit module, and opening the outdoor unit module with the minimum capacity in the outdoor unit modules with larger capacity; if not, determining whether the number of the modules in the current starting state is equal to the preset maximum number of the modules, if not, determining the module with the minimum capacity in the outdoor unit modules which are not started, and starting the module with the minimum capacity; if yes, maintaining the current state of the multi-split air conditioner system, and updating the correction value of the target outdoor unit module to delta t 0 = t'; wherein t 'is the difference value between the current actual heat exchange temperature difference of the target outdoor unit module and the initial target heat exchange temperature difference, and t' > 0. Based on the method, the modularized starting number and capacity are controlled according to the heat exchange temperature difference of the outdoor unit module, so that the operation capacity and the energy efficiency of the outdoor unit module are in the optimal heat exchange state.
In the execution process of the control method for the outdoor unit modules provided by the embodiment, whether the number of outdoor unit modules in an on-line state in the multi-split system changes or not can be monitored; and/or monitoring whether the total startup capacity of the multi-split system changes or not; and/or monitoring whether the target heat exchange temperature difference of each outdoor unit module changes; if one of the monitoring results is changed, triggering again after a preset time interval: acquiring a target heat exchange temperature difference of each outdoor unit module; and acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time. Based on the method, whether the operation capacity of the module unit is matched with the self capacity or not and whether the operation capacity and the energy efficiency of the outdoor unit module are in the optimal heat exchange state or not can be monitored in real time.
Example 2
The embodiment provides a method for controlling the starting capacity and the starting quantity of the modules by taking each operation module as a judgment object and utilizing the relation between the actual heat exchange temperature difference and the target heat exchange temperature difference of the outdoor heat exchanger, and the specific control flow is shown in fig. 2.
The inlet end and the outlet end of the outdoor heat exchanger of the air conditioner are provided with temperature detection devices for detecting the temperature of an inlet refrigerant and the temperature of an outlet refrigerant, and the actual heat exchange temperature difference delta T of the outdoor heat exchanger can be obtained by subtracting the temperature of the refrigerant flowing out of the outdoor heat exchanger from the temperature of the refrigerant entering the outdoor heat exchanger n . Target heat exchange temperature difference delta t of module (namely outdoor unit module) x Heat exchange temperature difference delta t from initial target n And a correction value Δ t 0 And (4) forming. The initial target heat exchange temperature difference delta tn is determined according to the outdoor environment temperature, the indoor unit startup rate, the preset temperature for starting the indoor unit and the indoor environment temperature. Namely, a set of outdoor environment temperature, the starting rate of the indoor unit, the preset temperature of the starting indoor unit and the initial target heat exchange temperature difference and the corrected value of the indoor environment temperature corresponding to one outdoor heat exchanger. Because the installation environments of different modules have differences, the detected outdoor environment temperature and the corrected value have differences, and therefore the target heat exchange temperature differences of different modules have differences.
Starting an indoor unit, detecting indoor capacity requirements by the air conditioner, starting a default number N of outdoor modules matched with the indoor capacity requirements, recording the number N = M of the started modules, and starting the capacity Q of each module n Total capacity of module at startup Q = Σ Q n . And determining a target heat exchange temperature difference and a correction value of the starting module according to the obtained outdoor environment temperature, the starting rate of the indoor unit, the preset temperature of the starting indoor unit and the indoor environment temperature. If no correction value exists, the correction value is processed as 0.
After the operation for the first preset time, judging the current actual heat exchange temperature difference delta T of each module n Temperature difference delta t between target heat exchange and target heat exchange x The relationship (2) of (c).
If the current actual heat exchange temperature difference delta T of each starting module (namely the outdoor unit module in the starting state) n Equal to the target heat exchange temperature difference delta t x And maintaining the current running module to continue running.
If the current actual heat exchange temperature difference delta T of a certain starting module n Less than target heat exchange temperature difference delta t x Determine the capacity of the moduleAnd the size of the capacity of the un-started module. If the module with smaller capacity exists in the un-started modules, the module is closed and the module with smaller capacity is started, and if a plurality of modules with smaller capacity exist in the un-started modules, the module with the largest capacity in the modules with smaller capacity is started. If the module with smaller capacity than the module does not exist in the un-started modules, judging whether the current starting module number M is 1. If M is larger than 1, closing the module, and starting the module at the moment, wherein the number N = M-1; if M =1, maintaining the operation of the current module, and recording the target heat exchange temperature difference correction value delta t of the module 0 T, = t < 0. And t is the difference value between the current actual heat exchange temperature difference delta Tn and the initial target heat exchange temperature difference of the module. The corrected value t corresponds to the outdoor environment temperature, the indoor unit startup rate, the preset temperature for starting the indoor unit and the indoor environment temperature one by one.
If the current actual heat exchange temperature difference delta T of a certain starting module n Greater than the target heat exchange temperature difference delta t x And judging the module capacity and the capacity of the un-started module. If the module with larger capacity exists in the un-started modules, the module is closed and the module with larger capacity is started, and if a plurality of modules with larger capacity exist in the un-started modules, the module with the smallest capacity in the modules with larger capacity is started. If the module with larger capacity than the module does not exist in the un-started modules, judging whether the current starting module number M is the maximum module number of the air conditioner. If M is smaller than the maximum module number, a newly-increased module is started, and the newly-started module is the module with the minimum capacity in the un-started modules, and at the moment, the number of the started modules is N = M +1. If M is the maximum module number of the air conditioning module, the current module is maintained to operate, and the target heat exchange temperature difference correction value delta t of the module is recorded 0 = T ', where T' is the current actual heat exchange temperature difference Δ T of the module n The difference value of the heat exchange temperature difference with the initial target is t' > 0. The corrected value t' corresponds to the outdoor ambient temperature, the indoor unit startup rate, the preset temperature of the startup indoor unit and the indoor ambient temperature one by one.
It should be noted that, in the above control scheme, when the number of the operating modules changes, and/or the total startup capacity changes, and/or the target heat exchange temperature difference of the modules changes, the control logic for determining the actual heat exchange temperature difference and the target heat exchange temperature difference of the modules is re-entered after the modules are operated for a preset time period.
It should be further noted that, in the above control scheme, if the current heat exchange temperature difference of the plurality of modules is inconsistent with the target heat exchange temperature difference, the following steps are performed: 1) When the actual heat exchange temperature difference of the modules is smaller than the target heat exchange temperature difference, the module with the largest capacity is controlled as above, and if the capacities are the same, one of the modules is randomly selected to be controlled as above. 2) When the actual heat exchange temperature difference of the modules is larger than the target heat exchange temperature difference, the module with the minimum capacity is controlled as above, and if the capacities are the same, one of the modules is randomly selected to be controlled as above. 3) When the actual heat exchange temperature difference of a certain module is smaller than the target heat exchange temperature difference and the actual heat exchange temperature difference of another module is larger than the target heat exchange temperature difference, the module with the actual heat exchange temperature difference larger than the target heat exchange temperature difference is controlled.
In the embodiment, each operation module is used as a control object, and the capacity and the number of the operation modules are controlled by utilizing the heat exchange temperature difference of the outdoor heat exchanger. When the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference, starting a module with smaller capacity to operate under the condition of reducing the number of the operating modules or keeping the number of the modules unchanged; when the actual heat exchange temperature difference is larger than the target heat exchange temperature difference, the module with larger capacity is started to operate under the condition that the number of the operation modules is increased or the number of the modules is not changed. When the target heat exchange temperature difference cannot be realized by changing the number or the capacity of the modules, the difference value between the actual temperature difference and the target heat exchange temperature difference is used as a correction value to correct the target heat exchange temperature difference of the modules.
In the actual use process of the modularized unit, the problem that the actual operation capacity is not matched with the capacity of the modularized unit occurs under the influence of objective factors such as installation and outdoor temperature environment, and further the problem that the operation capacity of the whole machine is insufficient or the energy efficiency is not high is caused. The actual heat transfer effect's of each module of modularization unit angle is followed to this embodiment, utilizes outdoor heat exchanger's heat transfer difference in temperature to control modularization start-up quantity and capacity, reaches start-up module quantity and heat transfer demand assorted effect, can avoid the influence of objective factors such as installation, outdoor environment to the operation module.
Example 3
Corresponding to the method for controlling the outdoor unit module described in fig. 1, the present embodiment provides a control apparatus for an outdoor unit module, such as the block diagram of the control apparatus for the outdoor unit module shown in fig. 3, where the apparatus includes:
the acquisition module 10 is used for acquiring the target heat exchange temperature difference of each outdoor unit module; acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time;
the first processing module 20, connected to the obtaining module 10, is configured to, when at least one outdoor unit module meets a first preset condition: under the condition that the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences of the other outdoor unit modules, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioner system;
the second processing module 30 is connected to the obtaining module 10, and configured to, when at least one outdoor unit module meets a second preset condition: under the condition that the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature differences, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air-conditioning system;
the third processing module 40 is connected to the obtaining module 10, and configured to maintain the current state of the multi-split air conditioning system when the actual heat exchange temperature difference of each outdoor unit module is equal to the target heat exchange temperature difference.
The embodiment also provides a multi-split system, wherein the multi-split system includes the control device of the outdoor unit module described above. The specific application of the control device of the outdoor unit module is described above, and is not described herein again.
Example 4
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
An embodiment of the present invention provides a non-volatile computer storage medium, where a computer-executable instruction is stored in the computer storage medium, and the computer-executable instruction may execute a control method of an outdoor unit module in any method embodiment described above.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A method of controlling an outdoor unit module, the method comprising:
acquiring a target heat exchange temperature difference of each outdoor unit module; acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time;
if the actual heat exchange temperature difference of each outdoor unit module is equal to the target heat exchange temperature difference, maintaining the current state of the multi-split system;
if at least one outdoor unit module meets a first preset condition: if the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air conditioner system;
if at least one outdoor unit module meets a second preset condition: and if the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature difference, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air conditioner system.
2. The method of claim 1, wherein obtaining the target heat exchange temperature difference for each outdoor unit module comprises:
detecting the outdoor environment temperature and the indoor environment temperature of each outdoor unit module, and acquiring the starting rate of the indoor units and the preset temperature of the indoor units in the starting state;
determining initial target heat exchange temperature difference delta t corresponding to each outdoor unit module according to the outdoor environment temperature, the indoor unit on-time rate and the preset temperature n And a correction value Δ t 0 ；
According to the initial target of each outdoor unit moduleThermal temperature difference Δ t n And a correction value Δ t 0 Calculating to obtain a target heat exchange temperature difference delta tx of each outdoor unit module; wherein Δ tx = Δ t n +Δt 0 。
3. The method of claim 1, wherein obtaining the actual heat exchange temperature difference of each outdoor unit module after the operation for the preset time period comprises:
after the operation is carried out for a preset time, detecting the inlet refrigerant temperature and the outlet refrigerant temperature of the outdoor heat exchangers of the outdoor unit modules;
calculating actual heat exchange temperature difference delta T of each outdoor unit module according to the inlet refrigerant temperature and the outlet refrigerant temperature n (ii) a Wherein, delta T n = inlet refrigerant temperature-outlet refrigerant temperature.
4. The method of claim 1, wherein if at least one outdoor unit module meets a first predetermined condition: the actual heat exchange temperature difference is less than the target heat exchange temperature difference, and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences thereof, then the target outdoor unit module is determined and a first control strategy is executed to reduce the total starting capacity of the multi-split air-conditioning system, and the method comprises the following steps:
if only one outdoor unit module meets a first preset condition, taking the outdoor unit module as a target outdoor unit module, and executing a first control strategy to reduce the total starting capacity of the multi-split air-conditioning system;
if a plurality of outdoor unit modules meet a first preset condition, selecting an outdoor unit module with the largest capacity from the plurality of outdoor unit modules, or randomly selecting one outdoor unit module under the condition that the capacities of the plurality of outdoor unit modules are the same; and taking the selected outdoor unit module as a target outdoor unit module, and executing a first control strategy to reduce the total starting capacity of the multi-split system.
5. The method of claim 4, wherein determining a target outdoor unit module and implementing a first control strategy to reduce the total startup capacity of the multi-split air-conditioning system comprises:
judging whether an outdoor unit module with the capacity smaller than that of the target outdoor unit module exists in outdoor unit modules which are not started;
if yes, closing the target outdoor unit module, and opening the outdoor unit module with the largest capacity in the outdoor unit modules with smaller capacity;
if not, determining whether the number of the modules in the current starting state is greater than 1, if so, closing the target outdoor unit module, otherwise, maintaining the current state of the multi-split system, and updating the correction value of the target outdoor unit module to delta t 0 = t; and t is the difference value between the current actual heat exchange temperature difference of the target outdoor unit module and the initial target heat exchange temperature difference, and t is less than 0.
6. The method of claim 1, wherein if at least one outdoor unit module meets a second predetermined condition: the actual heat exchange temperature difference is greater than the target heat exchange temperature difference, and the actual heat exchange temperature differences of other outdoor unit modules are equal to or less than the target heat exchange temperature differences, then the target outdoor unit module is determined and a second control strategy is executed to increase the total starting capacity of the multi-split air-conditioning system, and the method comprises the following steps:
if only one outdoor unit module meets a second preset condition, executing a second control strategy on the outdoor unit module to increase the total starting capacity of the multi-split air conditioner system;
if a plurality of outdoor unit modules meet a second preset condition, selecting an outdoor unit module with the minimum capacity from the plurality of outdoor unit modules, or randomly selecting one outdoor unit module under the condition that the capacities of the plurality of outdoor unit modules are the same; and executing a second control strategy on the selected outdoor unit module to increase the total starting capacity of the multi-split air-conditioning system.
7. The method of claim 6, wherein determining a target outdoor unit module and implementing a second control strategy to increase the total startup capacity of the multi-split air-conditioning system comprises:
judging whether an outdoor unit module with the capacity larger than that of the target outdoor unit module exists in the outdoor unit modules which are not started;
if yes, closing the target outdoor unit module, and opening the outdoor unit module with the minimum capacity in the outdoor unit modules with larger capacity;
if not, determining whether the number of the modules in the current starting state is equal to the preset maximum number of the modules, if not, determining the module with the minimum capacity in the outdoor unit modules which are not started, and starting the module with the minimum capacity; if yes, maintaining the current state of the multi-split system, and updating the correction value of the target outdoor unit module to delta t 0 = t'; wherein t 'is the difference value between the current actual heat exchange temperature difference and the initial target heat exchange temperature difference of the target outdoor unit module, and t' is greater than 0.
8. The method according to any one of claims 1 to 7, further comprising:
monitoring whether the number of outdoor unit modules in the starting state in the multi-split system changes or not; and/or monitoring whether the total startup capacity of the multi-split system changes or not; and/or monitoring whether the target heat exchange temperature difference of each outdoor unit module changes;
if one of the monitoring results is changed, triggering again after a preset time interval: acquiring target heat exchange temperature difference of each outdoor unit module; and acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time.
9. A control device of an outdoor unit module, the device comprising:
the acquisition module is used for acquiring the target heat exchange temperature difference of each outdoor unit module; acquiring the actual heat exchange temperature difference of each outdoor unit module after the operation is carried out for a preset time;
the first processing module is used for enabling at least one outdoor unit module to meet a first preset condition: under the condition that the actual heat exchange temperature difference is smaller than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to the target heat exchange temperature differences, determining the target outdoor unit module and executing a first control strategy to reduce the total starting capacity of the multi-split air-conditioning system;
the second processing module is used for processing the outdoor unit module according with a second preset condition: under the condition that the actual heat exchange temperature difference is larger than the target heat exchange temperature difference and the actual heat exchange temperature differences of other outdoor unit modules are equal to or smaller than the target heat exchange temperature difference, determining the target outdoor unit module and executing a second control strategy to increase the total starting capacity of the multi-split air conditioner system;
and the third processing module is used for maintaining the current state of the multi-split air-conditioning system under the condition that the actual heat exchange temperature difference of each outdoor unit module is equal to the target heat exchange temperature difference.
10. A multi-split air conditioning system, comprising the control device of the outdoor unit module of claim 9.
11. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 8.
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