Unit control method and apparatus, air conditioning unit, and storage medium

Abstract

Provided in the present disclosure are a unit control method and apparatus, an air conditioning unit, and a storage medium. The unit control method comprises: when a unit load is smaller than a preset load threshold value, determining whether a first preset condition for increasing the number of compressors in an operating state is met, wherein a unit comprises a first compressor currently in the operating state and a second compressor currently in a standby state; when the first preset condition is met, controlling the first compressor to enter the standby state; and when a second preset condition for starting a compressor is met, controlling the first compressor and the second compressor to synchronously enter the operating state.

Description

Unit control method and device, air conditioning unit and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims priority to an application with CN application number 202310945290.6 and filing date July 28, 2023. The disclosure content of this CN application is hereby incorporated into this disclosure as a whole. Technical Field

[0003] The present disclosure relates to the field of control, and in particular to a unit control method and device, an air conditioning unit, and a storage medium. Background Art

[0004] Currently, multiple compressors are set in the air-conditioning system. During the startup process of the air-conditioning system, one compressor is usually started first so that the compressor enters the operating state. When the air-conditioning system runs for a period of time and meets the preset conditions, the next compressor is started.

[0005] Summary of the Invention

[0006] According to a first aspect of an embodiment of the present disclosure, a unit control method is provided, comprising: when the unit load is less than a preset load threshold, determining whether a first preset condition for increasing the number of compressors in operation is met, wherein the unit comprises a first compressor that is currently in operation and a second compressor that is currently in standby; when the first preset condition is met, controlling the first compressor to enter the standby state; and when the second preset condition for starting the compressor is met, controlling the first compressor and the second compressor to enter the operation state synchronously.

[0007] In some embodiments, the second preset condition includes at least one of the following: the time when the first compressor enters the standby state is greater than or equal to a time threshold, and the pressure difference of the unit within a preset period is less than or equal to a pressure difference threshold.

[0008] In some embodiments, the pressure difference includes at least one of a condensing pressure difference and an evaporating pressure difference of the unit.

[0009] In some embodiments, the first preset condition includes at least one of the following: the main engine current of the first compressor is greater than a first preset current threshold, the target guide vane opening of the first compressor is a maximum opening, and the target frequency is a maximum frequency.

[0010] In some embodiments, the unit includes multiple second compressors currently in standby state, and controlling the first compressor and the second compressor to start includes: selecting a second compressor from the multiple second compressors as a first candidate compressor; and controlling the first compressor and the first candidate compressor to start.

[0011] In some embodiments, selecting a second compressor from among the plurality of second compressors as the first candidate compressor includes: selecting a second compressor with the shortest accumulated operating time among the plurality of second compressors as the first candidate compressor.

[0012] In some embodiments, the unit includes multiple first compressors that are currently in operation, and the method further includes: determining whether a third preset condition for reducing the number of compressors in operation is met; if the third preset condition is met, selecting a first compressor from the multiple first compressors as a second candidate compressor; and controlling the second candidate compressor to enter a standby state.

[0013] In some embodiments, selecting a first compressor from among the plurality of first compressors as the second candidate compressor includes: selecting a first compressor with the longest cumulative operating time among the plurality of first compressors as the second candidate compressor.

[0014] In some embodiments, the third preset condition includes at least one of the following: the main engine current of the first compressor is less than a second preset current threshold, the target guide vane opening of the first compressor is a minimum opening value, and the target frequency is a minimum frequency value.

[0015] In some embodiments, when the unit is started, one compressor is selected from the multiple compressors of the unit as the first compressor; the compressors other than the first compressor among the multiple compressors are used as the second compressor; the first compressor is controlled to enter the running state, and the second compressor is controlled to enter the standby state.

[0016] In some embodiments, when the unit is started, selecting a compressor from multiple compressors of the unit as the first compressor includes: when the unit is started, selecting a compressor from multiple compressors that meet preset startup conditions as the first compressor.

[0017] In some embodiments, selecting a compressor from among multiple compressors that meet preset startup conditions as the first compressor includes: selecting a compressor with the shortest cumulative operating time from among the multiple compressors that meet the preset startup conditions as the first compressor.

[0018] In some embodiments, using a compressor other than the first compressor among the plurality of compressors as the second compressor includes: using a compressor other than the first compressor among the plurality of compressors that meet the preset startup condition as the second compressor.

[0019] In some embodiments, when the third compressor that does not meet the preset startup condition meets the preset startup condition, the third compressor is controlled to enter a standby state.

[0020] According to a second aspect of an embodiment of the present disclosure, a unit control device is provided, including: a first processing module, configured to determine whether a first preset condition for increasing the number of compressors in operation is met when the unit load is less than a preset load threshold, wherein the unit includes a first compressor that is currently in operation and a second compressor that is currently in standby; a second processing module, configured to control the first compressor to enter the standby state when the first preset condition is met, and to control the first compressor and the second compressor to enter the operation state synchronously when the second preset condition for starting the compressor is met.

[0021] According to a third aspect of an embodiment of the present disclosure, a unit control device is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute a method as described in any of the above embodiments based on instructions stored in the memory.

[0022] According to a fourth aspect of an embodiment of the present disclosure, an air-conditioning unit is provided, comprising a unit control device as described in any of the above embodiments.

[0023] According to a fifth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0024] According to a sixth aspect of an embodiment of the present disclosure, a computer program is provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0025] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] FIG1 is a schematic flow chart of a method for controlling a unit according to an embodiment of the present disclosure;

[0028] FIG2 is a flow chart of a unit control method according to another embodiment of the present disclosure;

[0029] FIG3 is a flow chart of a unit control method according to another embodiment of the present disclosure;

[0030] FIG4 is a schematic structural diagram of a unit control device according to an embodiment of the present disclosure;

[0031] FIG5 is a schematic structural diagram of a unit control device according to another embodiment of the present disclosure;

[0032] FIG6 is a schematic structural diagram of a unit control device according to another embodiment of the present disclosure;

[0033] FIG7 is a schematic structural diagram of an air conditioning unit according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0035] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0036] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0037] Technologies, methods and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and equipment should be considered part of the authorization specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] The inventors noted that in a single-system tandem air conditioner, multiple compressors in the same system have the same startup conditions, but the startup and operation of each compressor causes changes in the system environment. After the first compressor starts, the overall air conditioning system conditions have already changed. Starting a second compressor under the same startup conditions at this point would negatively impact the system's operation.

[0041] For example, multiple bearing controllers are usually used to control the suspension operation of the magnetic levitation unit, where one compressor corresponds to one bearing controller. After the first compressor is running, a large pressure difference is generated in the system environment of the magnetic levitation unit. At this time, if the second compressor is started according to the same starting conditions, the second compressor will fail to start, causing the magnetic levitation unit to report a fault and the air-conditioning system to fail to operate as expected.

[0042] Accordingly, the present disclosure provides a unit control solution that can meet user comfort while ensuring stable operation of the unit.

[0043] Figure 1 is a flow chart of a unit control method according to an embodiment of the present disclosure. In some embodiments, the following unit control method is executed by a unit control device.

[0044] In step 101, when the unit load is less than a preset load threshold, it is determined whether a first preset condition for increasing the number of compressors in operation is satisfied.

[0045] It should be noted that the unit includes a first compressor that is currently in operation and a second compressor that is currently in standby state.

[0046] In some embodiments, the preset load threshold can be dynamically adjusted according to user needs so that the unit can meet user comfort requirements.

[0047] In some embodiments, there may be one or more first compressors currently in operation, and there may be one or more second compressors currently in standby.

[0048] In some embodiments, the first preset condition includes at least one of the following: the main engine current of the first compressor is greater than a first preset current threshold, the target guide vane opening of the first compressor is a maximum opening, and the target frequency is a maximum frequency.

[0049] It should be noted that if the first preset condition is not met, the unit can only operate normally when the first compressor is in operation. Controlling the second compressor to enter the operation state at this time will not significantly improve the unit's performance and will increase the load on the second compressor. Therefore, in this case, the first compressor should still be kept in the operation state. If the first preset condition is met, the unit's performance cannot be guaranteed when the first compressor is in operation alone. In this case, the number of compressors in the operation state needs to be increased.

[0050] For example, the first compressor's main engine current, target guide vane opening, and target frequency can all reflect the first compressor's current operating state. If the first compressor's main engine current is greater than a first preset current threshold, or if the first compressor's target guide vane opening is at its maximum opening and its target frequency is at its maximum frequency, then the first compressor is currently operating at full load. If the unit load is still less than the preset load threshold in this case, relying solely on the first compressor cannot meet the unit load requirement. In this case, the first and second compressors must be controlled to operate together to meet the unit load requirement.

[0051] Since the main engine current, target guide vane opening and target frequency of the compressor are easy to detect, it is possible to easily determine whether the number of compressors in operation needs to be increased based on the detected main engine current, target guide vane opening and target frequency of the compressor.

[0052] In step 102 , when a first preset condition is satisfied, the first compressor is controlled to enter a standby state.

[0053] By controlling the first compressor to enter the standby state, the unit can be placed in a relatively stable state.

[0054] In step 103 , when a second preset condition for starting the compressor is satisfied, the first compressor and the second compressor are controlled to enter a running state synchronously.

[0055] In some embodiments, the second preset condition includes at least one of the following: the time the first compressor enters the standby state is greater than or equal to a time threshold, and the pressure difference of the unit within a preset period is less than or equal to a pressure difference threshold.

[0056] It should be noted that if the second preset condition is met, it indicates that the unit as a whole is in a relatively stable state. In this case, controlling the first compressor and the second compressor to enter the operating state synchronously can effectively avoid a large pressure difference between the load before and after the compressor is started, thereby effectively avoiding unstable performance of the unit and will not cause the unit system to be unable to operate due to a reported fault.

[0057] For example, after the first compressor switches from the running state to the standby state, the large pressure difference generated may cause unstable unit performance. Since this large pressure difference will decrease over time, that is, the unstable unit performance will be alleviated over time, through a first test, the time when the first compressor switches from the running state to the standby state is used as the first moment, and the time when the pressure difference returns to the normal range is used as the second moment. Based on the difference between the first moment and the second moment, a time threshold is determined. In this way, when the time when the first compressor enters the standby state reaches or exceeds the time threshold, it can be ensured that the unit performance has returned to a stable state.

[0058] That is to say, by simply performing a time detection, it is possible to determine whether the unit performance has returned to a stable state. Obviously, as the number of the first test increases, the obtained time threshold becomes more accurate.

[0059] For another example, after the first compressor switches from the running state to the standby state, the large pressure difference generated may cause the unit performance to become unstable. This large pressure difference will decrease over time. When the pressure difference is within the normal range, it indicates that the unit performance has returned to a stable state. Therefore, the second test can be used to determine the pressure difference threshold corresponding to the unit performance returning to a stable state. Thus, after the first compressor enters the standby state, if the pressure difference of the unit within a preset period is less than or equal to the pressure difference threshold, it can be ensured that the unit performance has returned to a stable state.

[0060] That is to say, by simply performing a pressure difference test, it is possible to determine whether the performance of the unit has returned to a stable state. Obviously, as the number of the second test increases, the pressure difference threshold value obtained becomes more accurate.

[0061] In some embodiments, the pressure difference includes at least one of a condensing pressure difference and an evaporating pressure difference of the unit.

[0062] It should be noted that, on the one hand, the condensing pressure difference and the evaporating pressure difference are easy to detect, and on the other hand, the condensing pressure difference and the evaporating pressure difference can also accurately reflect the working status of the compressor. Therefore, by detecting at least one of the condensing pressure difference and the evaporating pressure difference of the unit, it is possible to accurately understand whether the unit is currently in a stable state.

[0063] In some embodiments, there are multiple second compressors currently in standby state in the unit. In this case, one second compressor is selected from the multiple second compressors as the first candidate compressor, and the first compressor and the first candidate compressor are controlled to start.

[0064] It should be noted that, when there are multiple second compressors currently in the standby state in the unit, one second compressor can be selected from the multiple second compressors as the first candidate compressor according to a preset rule.

[0065] For example, a second compressor is randomly selected from the plurality of second compressors as the first candidate compressor, so that the unit load can be evenly distributed among the plurality of second compressors in a random manner.

[0066] For another example, among multiple second compressors, the one with the shortest cumulative operating time is selected as the first candidate compressor. By selecting the one with the shortest cumulative operating time as the first candidate compressor, performance degradation of the selected second compressor due to excessive operating time is effectively avoided, thereby effectively extending the service life of the compressor.

[0067] In the unit control method provided in the above-mentioned embodiment of the present disclosure, when the number of operating compressors in the unit needs to be increased, the first compressor currently in operation is first controlled to enter a standby state. When the compressor operating conditions are met, the first and second compressors currently in standby states are controlled to enter an operating state simultaneously. This effectively prevents a large pressure difference between the load and before and after the compressors are started, thereby effectively avoiding unstable unit performance and preventing the unit system from being unable to operate due to fault reporting.

[0068] It should be noted that the control method for increasing the number of compressors in operation involved in the above embodiment may also be referred to as a machine-adding control method or a synchronous machine-adding control method.

[0069] Figure 2 is a flow chart of a unit control method according to an embodiment of the present disclosure. In some embodiments, the following unit control method is executed by a unit control device.

[0070] It should be noted that, in the following embodiments, there are multiple first compressors in the unit that are currently in operation.

[0071] In step 201 , it is determined whether a third preset condition for reducing the number of compressors in operation is satisfied.

[0072] In some embodiments, the third preset condition includes at least one of the following: the main engine current of the first compressor is less than a second preset current threshold, the target guide vane opening of the first compressor is a minimum opening value, and the target frequency is a minimum frequency value.

[0073] For example, the second preset current threshold is 30% of the normal value of the compressor main unit current.

[0074] It should be noted that if the third preset condition is not met, it indicates that in order to ensure stable unit performance, the compressors currently in operation must continue to operate. Therefore, in this case, the number of compressors currently in operation will not be reduced. If the third preset condition is met, it indicates that reducing the number of compressors currently in operation can still ensure stable unit performance. In this case, the number of compressors currently in operation can be reduced.

[0075] For example, the main engine current, target guide vane opening, and target frequency of the first compressor can all reflect the current operating state of the first compressor. If the main engine current of each of the multiple first compressors currently in operation is less than the second preset current threshold, or if the target guide vane opening of each first compressor is at the minimum opening value and the target frequency is at the minimum frequency value, then these multiple first compressors are currently operating in a light-load state. In other words, in this case, the unit load requirement can still be met by reducing the number of the multiple first compressors currently in operation.

[0076] Since the main engine current, target guide vane opening and target frequency of the compressor are easy to detect, it is possible to easily determine whether the number of compressors in operation needs to be reduced based on the detected main engine current, target guide vane opening and target frequency of the compressor.

[0077] In step 202 , when a third preset condition is satisfied, a first compressor is selected from a plurality of first compressors as a second candidate compressor.

[0078] In some embodiments, a first compressor is randomly selected from the plurality of first compressors as the second candidate compressor, so that the unit load can be evenly distributed among the plurality of first compressors.

[0079] In some embodiments, the first compressor with the longest cumulative operating time among the multiple first compressors is selected as the second candidate compressor. By selecting the first compressor with the longest cumulative operating time among the multiple first compressors as the second candidate compressor, performance degradation of the compressor due to excessive operating time is effectively avoided, thereby effectively extending the service life of the compressor.

[0080] In step 203 , the second candidate compressor is controlled to enter a standby state.

[0081] It should be noted that when it is necessary to reduce the number of compressors in operation in the unit, a first compressor is selected from multiple first compressors currently in operation, and the selected first compressor is controlled to enter the standby state, thereby ensuring the stability of the unit performance while effectively reducing the workload of the compressor.

[0082] It should be noted that the control method for reducing the number of compressors in operation involved in the above embodiment may also be referred to as a machine reduction control method.

[0083] Figure 3 is a flow chart of a unit control method according to another embodiment of the present disclosure. In some embodiments, the following unit control method is executed by a unit control device.

[0084] In step 301 , when the unit is started, a compressor is selected from a plurality of compressors in the unit as a first compressor.

[0085] In some embodiments, when the unit is started, a compressor is selected from multiple compressors that meet preset startup conditions as the first compressor, thereby ensuring that the selected compressor can operate normally, thereby ensuring stable operation of the unit.

[0086] In some embodiments, among multiple compressors that meet preset startup conditions, a compressor with the shortest cumulative operating time is selected as the first compressor.

[0087] It should be noted that by selecting a compressor with the shortest cumulative working time among multiple compressors as the first compressor, the unit load can be evenly distributed among multiple compressors to prevent the performance of the compressor from degrading due to long running time, thereby effectively extending the service life of the compressor.

[0088] In step 302 , a compressor other than the first compressor among the plurality of compressors is used as a second compressor.

[0089] In some embodiments, a compressor other than the first compressor among the plurality of compressors that meet the preset startup condition is used as the second compressor.

[0090] It should be noted that, through the above processing, it can be ensured that during the process of increasing the number of compressors in the running state, the selected compressors can smoothly enter the running state.

[0091] In step 303 , the first compressor is controlled to enter a running state, and the second compressor is controlled to enter a standby state.

[0092] Through the above processing, during the startup of the unit, one compressor is controlled to enter the running state, while the other compressors enter the standby state, thereby providing conditions for implementing the additional machine control of the above embodiment.

[0093] In some embodiments, when the third compressor that does not meet the preset startup condition meets the preset startup condition, the third compressor is controlled to enter a standby state.

[0094] It should be noted that if the third compressor meets the preset startup conditions, since the first compressor is already in operation, controlling the third compressor to enter the operating state will affect the stability of the unit's performance. Therefore, if the third compressor meets the preset startup conditions, the third compressor is controlled to enter the standby state to maintain stable unit performance.

[0095] FIG4 is a schematic diagram of the structure of a unit control device according to an embodiment of the present disclosure. As shown in FIG4 , the unit control device includes a first processing module 41 and a second processing module 42 .

[0096] The first processing module 41 is configured to determine whether a first preset condition for increasing the number of compressors in operation is met when the unit load is less than a preset load threshold, wherein the unit includes a first compressor that is currently in operation and a second compressor that is currently in standby.

[0097] In some embodiments, the preset load threshold can be dynamically adjusted according to user needs so that the unit can meet user comfort requirements.

[0098] In some embodiments, there may be one or more first compressors currently in operation, and there may be one or more second compressors currently in standby.

[0099] In some embodiments, the first preset condition includes at least one of the following: the main engine current of the first compressor is greater than a first preset current threshold, the target guide vane opening of the first compressor is a maximum opening, and the target frequency is a maximum frequency.

[0100] It should be noted that if the first preset condition is not met, the unit can only operate normally when the first compressor is in operation. Controlling the second compressor to enter the operation state at this time will not significantly improve the unit's performance and will increase the load on the second compressor. Therefore, in this case, the first compressor should still be kept in the operation state. If the first preset condition is met, the unit's performance cannot be guaranteed when the first compressor is in operation alone. In this case, the number of compressors in the operation state needs to be increased.

[0101] The second processing module 42 is configured to control the first compressor to enter a standby state when a first preset condition is met, and to control the first compressor and the second compressor to enter a running state synchronously when a second preset condition for starting the compressor is met.

[0102] It should be noted that by controlling the first compressor to enter the standby state, the unit can be placed in a relatively stable state.

[0103] In some embodiments, the second preset condition includes at least one of the following: the time the first compressor enters the standby state is greater than or equal to a time threshold, and the pressure difference of the unit within a preset period is less than or equal to a pressure difference threshold.

[0104] It should be noted that if the second preset condition is met, it indicates that the unit as a whole is in a relatively stable state. In this case, controlling the first compressor and the second compressor to enter the operating state synchronously can effectively avoid a large pressure difference between the load before and after the compressor is started, thereby effectively avoiding unstable performance of the unit and will not cause the unit system to be unable to operate due to a reported fault.

[0105] In some embodiments, the pressure difference includes at least one of a condensing pressure difference and an evaporating pressure difference of the unit.

[0106] It should be noted that by detecting at least one of the condensing pressure difference and the evaporating pressure difference of the unit, it is possible to accurately understand whether the unit is currently in a stable state.

[0107] In some embodiments, there are multiple second compressors in the unit that are currently in standby mode. In this case, the second processing module 42 selects one of the multiple second compressors as the first candidate compressor and controls the first compressor and the first candidate compressor to start.

[0108] It should be noted that, when there are multiple second compressors currently in the standby state in the unit, one second compressor can be selected from the multiple second compressors as the first candidate compressor according to a preset rule.

[0109] For example, a second compressor is randomly selected from the plurality of second compressors as the first candidate compressor, so that the unit load can be evenly distributed among the plurality of second compressors in a random manner.

[0110] For another example, among multiple second compressors, the one with the shortest cumulative operating time is selected as the first candidate compressor. By selecting the one with the shortest cumulative operating time as the first candidate compressor, performance degradation of the selected second compressor due to excessive operating time is effectively avoided, thereby effectively extending the service life of the compressor.

[0111] In the unit control device provided in the above-described embodiment of the present disclosure, when the number of operating compressors in the unit needs to be increased, the first compressor currently in operation is first controlled to enter a standby state. When the compressor operating conditions are met, the first and second compressors currently in standby states are controlled to enter an operating state simultaneously. This effectively prevents a large pressure difference between the load and before and after the compressors are started, thereby effectively preventing unstable unit performance and preventing the unit system from being unable to operate due to fault reporting.

[0112] In some embodiments, the second processing module 42 is configured to determine whether a third preset condition for reducing the number of compressors in operation is satisfied.

[0113] In some embodiments, the third preset condition includes at least one of the following: the main engine current of the first compressor is less than a second preset current threshold, the target guide vane opening of the first compressor is a minimum opening value, and the target frequency is a minimum frequency value.

[0114] For example, the second preset current threshold is 30% of the normal value of the compressor host current.

[0115] It should be noted that if the third preset condition is not met, it indicates that in order to ensure stable unit performance, the compressors currently in operation must continue to operate. Therefore, in this case, the number of compressors currently in operation will not be reduced. If the third preset condition is met, it indicates that reducing the number of compressors currently in operation can still ensure stable unit performance. In this case, the number of compressors currently in operation can be reduced.

[0116] When the third preset condition is satisfied, the second processing module 42 is configured to select one of the plurality of first compressors as a second candidate compressor, and control the second candidate compressor to enter a standby state.

[0117] In some embodiments, the second processing module 42 randomly selects a first compressor from the plurality of first compressors as the second candidate compressor, thereby evenly distributing the unit load among the plurality of first compressors.

[0118] In some embodiments, the second processing module 42 selects the first compressor with the longest cumulative operating time from among the multiple first compressors as the second candidate compressor. By selecting the first compressor with the longest cumulative operating time from among the multiple first compressors as the second candidate compressor, performance degradation of the compressor due to excessive operating time is effectively avoided, thereby effectively extending the service life of the compressor.

[0119] It should be noted that when it is necessary to reduce the number of compressors in operation in the unit, a first compressor is selected from multiple first compressors currently in operation, and the selected first compressor is controlled to enter the standby state, thereby ensuring the stability of the unit performance while effectively reducing the workload of the compressor.

[0120] FIG5 is a schematic structural diagram of a unit control device according to another embodiment of the present disclosure. FIG5 differs from FIG4 in that, in the embodiment shown in FIG5 , the unit control device further includes a third processing module 43 .

[0121] The third processing module 43 is configured to select a compressor from a plurality of compressors in the unit as a first compressor when the unit is started.

[0122] In some embodiments, when the unit is started, the third processing module 43 selects a compressor from multiple compressors that meet the preset startup conditions as the first compressor, thereby ensuring that the selected compressor can operate normally, thereby ensuring stable operation of the unit.

[0123] In some embodiments, among the multiple compressors that meet the preset startup conditions, the third processing module 43 selects a compressor with the shortest cumulative operating time as the first compressor.

[0124] It should be noted that by selecting a compressor with the shortest cumulative working time among multiple compressors as the first compressor, the unit load can be evenly distributed among multiple compressors to prevent the performance of the compressor from degrading due to long running time, thereby effectively extending the service life of the compressor.

[0125] Next, the third processing module 43 is configured to use a compressor other than the first compressor among the plurality of compressors as a second compressor.

[0126] In some embodiments, the third processing module 43 uses a compressor other than the first compressor among the plurality of compressors that meet the preset startup condition as the second compressor.

[0127] It should be noted that, through the above processing, it can be ensured that during the process of increasing the number of compressors in the running state, the selected compressors can smoothly enter the running state.

[0128] Next, the third processing module 43 controls the first compressor to enter the running state, and controls the second compressor to enter the standby state.

[0129] Through the above processing, during the startup of the unit, one compressor is controlled to enter the running state, while the other compressors enter the standby state, thereby providing conditions for implementing the additional machine control of the above embodiment.

[0130] In some embodiments, when the third compressor that does not meet the preset startup condition meets the preset startup condition, the third processing module 43 controls the third compressor to enter the standby state.

[0131] It should be noted that if the third compressor meets the preset startup conditions, since the first compressor is already in operation, controlling the third compressor to enter the operating state will affect the stability of the unit's performance. Therefore, if the third compressor meets the preset startup conditions, the third compressor is controlled to enter the standby state to maintain stable unit performance.

[0132] FIG6 is a schematic diagram of the structure of a unit control device according to another embodiment of the present disclosure. As shown in FIG6 , the unit control device includes a memory 61 and a processor 62 .

[0133] The memory 61 is used to store instructions. The processor 62 is coupled to the memory 61 . The processor 62 is configured to execute the method involved in any one of the embodiments in FIG. 1-3 based on the instructions stored in the memory.

[0134] As shown in Figure 6, the unit control device also includes a communication interface 63 for exchanging information with other devices. At the same time, the unit control device also includes a bus 64, through which the processor 62, the communication interface 63, and the memory 61 communicate with each other.

[0135] The memory 61 may include high-speed RAM memory or non-volatile memory, such as at least one disk storage device. The memory 61 may also be a memory array. The memory 61 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0136] Furthermore, the processor 62 may be a central processing unit (CPU), or may be an application-specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the present disclosure.

[0137] The present disclosure also relates to a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method involved in any one of the embodiments in Figures 1-3 is implemented.

[0138] Figure 7 is a schematic diagram of the structure of an air conditioning unit according to an embodiment of the present disclosure. As shown in Figure 7, the air conditioning unit 70 includes a unit control device 71. The unit control device 71 is the unit control device involved in any of the embodiments in Figures 4 to 6.

[0139] The above embodiments of the present disclosure are described below through specific examples.

[0140] Example 1

[0141] The air conditioning unit is equipped with three compressors: compressor 1, compressor 2, and compressor 3. When the air conditioning unit is started, if compressors 1, 2, and 3 all meet the preset startup conditions, compressor 1, which has the shortest cumulative operating time, is selected and put into operation, while compressors 2 and 3 are put into standby.

[0142] Example 2

[0143] According to the first embodiment, during unit operation, compressor 1 is in operation, and compressors 2 and 3 are in standby. If the unit load is less than a preset load threshold, a determination is made as to whether a first preset condition is satisfied. The first preset condition includes at least one of the following: the main engine current of compressor 1 is greater than a first preset current threshold, the target guide vane opening of compressor 1 is at a maximum opening, and the target frequency is at a maximum frequency.

[0144] When the first preset condition is met, the compressor 1 is controlled to enter the standby state so as to keep the unit in a relatively stable state.

[0145] Next, it is determined whether a second preset condition for starting the compressor is met. The second preset condition includes at least one of the following: the time the compressor 1 enters the standby state is greater than or equal to a time threshold, and the pressure difference of the unit within a preset period is less than or equal to a pressure difference threshold.

[0146] For example, the above-mentioned pressure difference includes at least one of the condensing pressure difference and the evaporating pressure difference of the unit.

[0147] If the second preset condition is met, compressor 3, which has the shortest cumulative operating time, is selected from compressors 2 and 3, and compressors 1 and 3 are controlled to enter the operating state simultaneously. At this point, compressors 1 and 3 are in the operating state, while compressor 2 is in the standby state. This improves user comfort while ensuring stable unit operation.

[0148] Example 3

[0149] According to the second embodiment, during unit operation, compressors 1 and 3 are in operation, and compressor 2 is in standby. First, a determination is made as to whether a third preset condition for reducing the number of operating compressors is satisfied. The third preset condition includes at least one of the following: the main engine current of compressors 1 and 3 is less than a second preset current threshold, the target guide vane opening of compressors 1 and 3 is at a minimum opening value, and the target frequency is at a minimum frequency value.

[0150] If the third preset condition is met, compressor 1, which has the longest cumulative operating time, is selected from compressors 1 and 3 and is controlled to enter standby mode. At this point, compressor 3 is in operation, while compressors 1 and 2 are in standby mode. This ensures both user comfort and unit operational stability.

[0151] Example 4

[0152] The air conditioning unit is equipped with two compressors, compressor 1 and compressor 2. When the air conditioning unit is started, if both compressors 1 and 2 meet the preset startup conditions, compressor 1, which has the shortest cumulative operating time, is selected and put into operation, while compressor 2 is put into standby.

[0153] Example 5

[0154] According to the fourth embodiment, during unit operation, compressor 1 is in operation and compressor 2 is in standby. If the unit load is less than a preset load threshold, a determination is made as to whether a first preset condition is satisfied. The first preset condition includes at least one of the following: the main engine current of compressor 1 is greater than a first preset current threshold, the target guide vane opening of compressor 1 is at a maximum opening, and the target frequency is at a maximum frequency.

[0155] When the first preset condition is met, the compressor 1 is controlled to enter the standby state so as to keep the unit in a relatively stable state.

[0156] Next, it is determined whether a second preset condition for starting the compressor is met. The second preset condition includes at least one of the following: the time the compressor 1 enters the standby state is greater than or equal to a time threshold, and the pressure difference of the unit within a preset period is less than or equal to a pressure difference threshold.

[0157] For example, the above-mentioned pressure difference includes at least one of the condensing pressure difference and the evaporating pressure difference of the unit.

[0158] When the second preset condition is met, compressors 1 and 2 are controlled to enter the operating state synchronously, thereby improving user comfort while ensuring the stability of the unit operation.

[0159] Example 6

[0160] According to the fifth embodiment, during unit operation, compressors 1 and 2 are in an operating state. First, a determination is made as to whether a third preset condition for reducing the number of operating compressors is satisfied. The third preset condition includes at least one of the following: the main engine currents of compressors 1 and 2 are less than a second preset current threshold, the target guide vane openings of compressors 1 and 2 are at a minimum opening value, and the target frequencies are at a minimum frequency value.

[0161] If the third preset condition is met, the compressor with the longest cumulative operating time is selected between compressors 1 and 2, and compressor 1 is controlled to enter standby mode. At this point, compressor 2 is in operation, while compressor 1 is in standby mode. This ensures both user comfort and unit operational stability.

[0162] In some embodiments, the functional units described above may be implemented as general-purpose processors, programmable logic controllers (PLC), digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof, for performing the functions described in the present disclosure.

[0163] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or by a program to instruct the relevant hardware, and the program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0164] The description of the present disclosure is provided for purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the disclosed form. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present disclosure and to enable those skilled in the art to understand the present disclosure and design various embodiments with various modifications suitable for specific applications.

Claims

1. A unit control method, comprising: In the case where the load of the unit is less than a preset load threshold, determining whether a first preset condition for increasing the number of compressors in operation is satisfied, wherein the unit includes a first compressor currently in operation and a second compressor currently in standby; When the first preset condition is met, controlling the first compressor to enter a standby state; When a second preset condition for starting the compressor is met, the first compressor and the second compressor are controlled to enter a running state synchronously.

2. The method according to claim 1, wherein: The second preset condition includes at least one of the following: the time when the first compressor enters the standby state is greater than or equal to a time threshold, and the pressure difference of the unit within a preset period is less than or equal to a pressure difference threshold.

3. The method according to claim 2, wherein: The pressure difference includes at least one of a condensing pressure difference and an evaporating pressure difference of the unit.

4. The method according to claim 1, wherein: The first preset condition includes at least one of the following: the main engine current of the first compressor is greater than a first preset current threshold, the target guide vane opening of the first compressor is a maximum opening, and the target frequency is a maximum frequency.

5. The method according to claim 1, wherein: The unit includes a plurality of second compressors currently in a standby state, Controlling the first compressor and the second compressor to start includes: selecting a second compressor from among the plurality of second compressors as a first candidate compressor; The first compressor and the first candidate compressor are controlled to start.

6. The method according to claim 5, wherein: Selecting one of the plurality of second compressors as a first candidate compressor comprises: Among the plurality of second compressors, a second compressor having the shortest cumulative operating time is selected as the first candidate compressor.

7. The method according to claim 1, wherein: The unit includes a plurality of first compressors currently in operation, and the method further includes: determining whether a third preset condition for reducing the number of compressors in operation is satisfied; When the third preset condition is satisfied, selecting a first compressor from the plurality of first compressors as a second candidate compressor; The second candidate compressor is controlled to enter a standby state.

8. The method according to claim 7, wherein: Selecting a first compressor from the plurality of first compressors as a second candidate compressor comprises: Among the plurality of first compressors, a first compressor having the longest cumulative operating time is selected as a second candidate compressor.

9. The method according to claim 7, wherein: The third preset condition includes at least one of the following: the main engine current of the first compressor is less than a second preset current threshold, the target guide vane opening of the first compressor is a minimum opening value, and the target frequency is a minimum frequency value.

10. The method according to any one of claims 1 to 9, further comprising: When the unit is started, selecting a compressor from a plurality of compressors of the unit as the first compressor; using a compressor among the plurality of compressors other than the first compressor as the second compressor; The first compressor is controlled to enter a running state, and the second compressor is controlled to enter a standby state.

11. The method according to claim 10, wherein: When the unit is started, selecting a compressor from a plurality of compressors of the unit as the first compressor comprises: When the unit is started, a compressor is selected from multiple compressors that meet the preset startup conditions. As the first compressor.

12. The method according to claim 11, wherein: Selecting a compressor from a plurality of compressors that meet a preset startup condition as the first compressor includes: Among the multiple compressors that meet the preset startup conditions, a compressor with the shortest cumulative working time is selected as the first compressor.

13. The method according to claim 11, wherein: Using a compressor other than the first compressor among the plurality of compressors as the second compressor includes: A compressor other than the first compressor among the plurality of compressors meeting the preset startup condition is used as the second compressor.

14. The method according to claim 11, further comprising: When the third compressor that does not meet the preset startup condition meets the preset startup condition, the third compressor is controlled to enter a standby state.

15. A unit control device, comprising: A first processing module is configured to determine whether a first preset condition for increasing the number of compressors in operation is satisfied when the load of the unit is less than a preset load threshold, wherein the unit includes a first compressor currently in operation and a second compressor currently in standby; The second processing module is configured to control the first compressor to enter a standby state when the first preset condition is met, and control the first compressor and the second compressor to enter a running state synchronously when a second preset condition for starting the compressor is met.

16. A unit control device, comprising: Memory; A processor is coupled to the memory, and the processor is configured to execute the method according to any one of claims 1 to 14 based on instructions stored in the memory.

17. An air conditioning unit, comprising the unit control device according to any one of claims 15 or 16.

18. A non-transitory computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method according to any one of claims 1 to 14 is implemented.

19. A computer program comprising computer instructions, wherein the computer instructions implement the method according to any one of claims 1 to 14 when executed by a processor.

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