Air conditioning system control method and device, air conditioning system and readable storage medium

Abstract

The invention provides an air conditioner system control method and device, an air conditioner system and a readable storage medium. The method comprises the steps that real-time operation state data of a first compressor and real-time operation state data of a second compressor are obtained; according to the real-time operation state data, whether the starting number of compressors changes or not is judged; if it is determined that the number of started compressors changes according to the real-time operation state data, the opening degree of a gas bypass valve is increased; and if it is determined that the starting number of the compressors does not change according to the real-time operation state data, compressor control parameters in the real-time operation state data are obtained, and the opening degree of the gas bypass valve is adjusted according to the compressor control parameters. When the starting number of the compressors changes, the opening degree of the air bypass valve can be increased, and therefore the system instability caused by the number change of the compressors can be dealt with; furthermore, the opening degree of the gas bypass valve is adjusted based on the control parameters of the compressor, the adjustment requirement of the compressor can be met, and accurate control over the gas bypass valve under the double-compressor scene is achieved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning control, and more particularly to an air conditioning system control method, device, air conditioning system, and readable storage medium. Background Technology

[0002] In current commercial air conditioning systems, a single system with dual compressors is often used for control, meaning that two compressors share one air conditioning system.

[0003] The gas bypass valve in the air conditioning system plays a crucial role in the operation of the air conditioning system. When the air conditioning system is under low load or the operating conditions fluctuate, the gas bypass valve adjusts the refrigerant bypass flow to stabilize the compressor operation, thereby preventing surge, balancing system pressure, and improving operating efficiency and safety.

[0004] However, in a single-system, dual-compressor structure, only one bypass valve is typically set up to control the bypass flow of the two compressors. The control strategies of the bypass valves in the existing technology are all designed for a single compressor. Therefore, it is difficult to meet the bypass flow control requirements in the application scenario of a single-system, dual-compressor system. Summary of the Invention

[0005] The main objective of this invention is to provide an air conditioning system control method, device, air conditioning system, and readable storage medium, aiming to solve the problem that the gas bypass valve in the prior art is difficult to meet the bypass flow control requirements in the application scenario of a dual-compressor system.

[0006] To achieve the above objectives, the present invention provides an air conditioning system control method, wherein the air conditioning system includes two compressors; the method includes the following steps: Obtain real-time operating status data of the first compressor and the second compressor; Based on the real-time operating status data, it is determined whether there is a change in the number of compressors started, where the number of compressors started is the number of compressors in operation. If it is determined from the real-time operating status data that there is a change in the number of compressors started, then increase the opening of the gas bypass valve; If it is determined from the real-time operating status data that there is no change in the number of compressors started, then the compressor control parameters in the real-time operating status data are obtained, and the opening degree of the gas bypass valve is adjusted according to the compressor control parameters.

[0007] Optionally, determining whether there is a change in the number of compressors started based on the real-time operating status data includes: When it is determined that the air conditioner is in the start-up phase based on the real-time operating status data, the compressor start-up sequence based on the real-time operating status data is determined. Determine the start time corresponding to the compressor start sequence; At the start-up time, it is determined that there is a change in the number of compressors starting.

[0008] Optionally, increasing the gas bypass valve opening if a change in the number of compressor starts is determined based on the real-time operating status data includes: If it is determined from the real-time operating status data that the air conditioner is in the start-up phase, then the first start-up time of the first compressor and the second start-up time of the second compressor are determined from the real-time operating status data. At the first start-up moment, the opening degree of the gas bypass valve is increased to a first preset degree; At the second start-up moment, the opening degree of the gas bypass valve is increased to a second preset degree.

[0009] Optionally, increasing the opening degree of the gas bypass valve to a second preset degree includes: Determine whether the air conditioning system has finished starting based on the real-time operating status data; If the air conditioning system has started up, then obtain the preset reduction step size; The opening of the air bypass valve is reduced by a preset reduction step at preset time intervals until the air bypass valve is closed.

[0010] Optionally, determining whether there is a change in the number of compressors started based on the real-time operating status data includes: Based on the real-time operating status data, determine whether a compressor has triggered a safety unloading; If a compressor triggers a safety unload, then a change in the number of compressors started is confirmed.

[0011] Optionally, determining whether there is a change in the number of compressors started based on the real-time operating status data includes: Determine whether to trigger the air conditioning system to shut down based on the real-time operating status data; If the air conditioning system is triggered to shut down, it is determined that there is a change in the number of compressors started.

[0012] Optionally, adjusting the opening degree of the gas bypass valve according to the compressor control parameters includes: Obtain the compressor increment from the real-time operating status data; Determine the opening adjustment value corresponding to the compressor increment, wherein the compressor increment is negatively correlated with the opening adjustment value.

[0013] To achieve the above objectives, the present invention also provides an air conditioning system control device, the air conditioning system control device comprising: The first acquisition module is used to acquire real-time operating status data of the first compressor and the second compressor; The first judgment module is used to determine whether there is a change in the number of compressors started based on the real-time operating status data, wherein the number of compressors started is the number of compressors in the running state; The first determining module is used to increase the opening of the gas bypass valve if it is determined from the real-time operating status data that there is a change in the number of compressors started. The second determining module is used to, if it is determined from the real-time operating status data that there is no change in the number of compressors started, obtain the compressor control parameters in the real-time operating status data, and adjust the opening degree of the gas bypass valve according to the compressor control parameters.

[0014] Optionally, the first determination module includes: The first determining unit is used to determine the compressor start-up sequence of the real-time operating status data when the air conditioner is in the start-up phase, based on the real-time operating status data. The second determining unit is used to determine the start-up time corresponding to the compressor start-up sequence; The third determining unit is used to determine, at the startup time, whether there is a change in the number of compressors starting.

[0015] Optionally, the first determining module includes: The fourth determining unit is used to determine the first start time of the first compressor and the second start time of the second compressor based on the real-time operating status data if it is determined that the air conditioner is in the start-up phase based on the real-time operating status data. The first lifting unit is used to increase the opening degree of the gas bypass valve to a first preset opening degree at the first start-up time; The second lifting unit is used to increase the opening degree of the gas bypass valve to a second preset degree at the second start-up time.

[0016] Optionally, the second lifting unit includes: The first judgment subunit is used to increase the opening degree of the gas bypass valve to a second preset opening degree and then determine whether the air conditioning system has been started up based on the real-time operating status data. The first acquisition subunit is used to acquire a preset reduction step size if the air conditioning system has finished starting. The first reduction subunit is used to reduce the opening of the gas bypass valve by a preset reduction step size at preset time intervals until the gas bypass valve is closed.

[0017] Optionally, the first determination module includes: The fifth determining unit is used to determine whether the compressor has triggered a safety unloading based on the real-time operating status data; The sixth determining unit is used to determine if there is a change in the number of compressors started if a compressor triggers a safety unloading.

[0018] Optionally, the first determination module includes: The seventh determining unit is used to determine whether to trigger the air conditioning system to shut down based on the real-time operating status data; The eighth determining unit is used to determine if there is a change in the number of compressors started if the air conditioning system is triggered to shut down.

[0019] Optionally, the second determining module includes: The first acquisition unit is used to acquire the compressor increment in the real-time operating status data; The ninth determining unit is used to determine the opening adjustment value corresponding to the compressor increment, wherein the compressor increment is negatively correlated with the opening adjustment value.

[0020] To achieve the above objectives, the present invention also provides an air conditioning system, the air conditioning system including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the air conditioning system control method as described above.

[0021] To achieve the above objectives, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the air conditioning system control method described above.

[0022] This invention proposes an air conditioning system control method, device, air conditioning system, and readable storage medium. The method acquires real-time operating status data of a first compressor and a second compressor; determines whether there is a change in the number of compressors started based on the real-time operating status data, where the number of compressors started refers to the number of compressors in operation; if a change in the number of compressors started is determined based on the real-time operating status data, the opening of the bypass valve is increased; if no change in the number of compressors started is determined based on the real-time operating status data, the compressor control parameters in the real-time operating status data are acquired, and the opening of the bypass valve is adjusted according to the compressor control parameters. By determining the change in the number of compressors started through real-time operating status data, the opening of the bypass valve can be increased when the number of compressors started changes, thereby addressing system instability caused by changes in the number of compressors; simultaneously, when the number of compressors started is stable, the opening of the bypass valve is further adjusted based on the compressor control parameters, so that the opening of the bypass valve can adapt to the adjustment needs of the compressors, achieving accurate control of the bypass valve in a dual-compressor scenario. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating the first embodiment of the air conditioning system control method of the present invention; Figure 2 This is a detailed flowchart of the air conditioning system control method of the present invention; Figure 3 This is a detailed flowchart of the air conditioning system shutdown process in the air conditioning system control method of the present invention; Figure 4 This is a schematic diagram of the modular structure of the air conditioning system of the present invention. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0027] This invention provides a method for controlling an air conditioning system, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the air conditioning system control method of the present invention. The air conditioning system includes two compressors; the method includes the following steps: Step S10: Obtain real-time operating status data of the first compressor and the second compressor; This application applies to single-system, dual-compressor air conditioning systems; the specific structure of the air conditioning system can be set according to actual needs.

[0028] The air conditioning system includes a first compressor and a second compressor; the first compressor and the second compressor can operate separately or simultaneously.

[0029] Real-time operating status data is used to indicate the operating status of the first compressor and the second compressor. The specific parameter types included in the real-time operating status data can be set according to actual needs, such as compressor start-up indicators, compressor control signals, and compressor unloading status.

[0030] The compressor start indicator is used to indicate the compressor's start status, specifically indicating whether the compressor is in the start or off state.

[0031] The compressor's control signal indicates the control of the compressor's operating status. Specifically, the control signal can be the PID increment output by the controller based on the PID algorithm.

[0032] The compressor unloading status indicates the reason for compressor unloading. For example, the unloading status can specifically indicate that the compressor is unloading under high pressure, low pressure, or current.

[0033] Real-time operating status data can be acquired in specific ways based on the actual source of the parameters, such as connecting to the controller to obtain the relevant parameters from the controller.

[0034] Step S20: Determine whether there is a change in the number of compressors started based on the real-time operating status data, wherein the number of compressors started is the number of compressors in the running state; The number of compressors started refers to the number of compressors that are currently in operation.

[0035] The change in the number of compressors started indicates a change in the number of compressors currently in operation.

[0036] For example, when the air conditioning system changes from the off state to the on state, the compressor needs to change from the off state to the on state. At this time, the number of compressors started changes, that is, there is a change in the number of compressors started. For example, when the air conditioning system switches from the off state to the on state, the first compressor and the second compressor start one after the other. When the first compressor starts, the number of compressors started changes from 0 to 1, which is a change in the number of compressors started. When the second compressor starts, the number of compressors started changes from 1 to 2, which is also a change in the number of compressors started. That is, in this case, the number of compressors started will change twice.

[0037] For example, when the compressor is unloaded, the number of compressors started decreases by 1, and the change in the number of compressors started is determined by storing the data.

[0038] Step S30: If it is determined from the real-time operating status data that there is a change in the number of compressors started, then increase the opening of the gas bypass valve; A gas bypass valve is a control valve in an air conditioning system used to bypass a portion of the low-temperature, low-pressure gaseous refrigerant from the evaporator outlet directly back to the compressor suction end. The specific type of gas bypass valve can be selected based on actual needs, such as a gas bypass butterfly valve.

[0039] The main purpose of the gas bypass valve is to maintain the compressor suction pressure stable during low system load, start-stop transients, or operating condition fluctuations, prevent surge, and ensure operational safety and efficiency.

[0040] It is understandable that in a single-system, dual-compressor structure, the two compressors share the evaporator and suction line; therefore, when the number of compressors in operation changes, the compressor environment will inevitably change drastically. If an additional compressor is started, the compressor's refrigerant handling capacity increases by one unit. However, the refrigerant flow rate in the pipeline cannot immediately increase to match the system demand after the compressor is added, which will cause a sharp drop in suction pressure and cause compressor surge. For example, when one compressor is turned off, the compressor's refrigerant handling capacity decreases by one unit. However, the refrigerant flow rate in the pipeline cannot be reduced immediately to match the system demand after the compressor is turned off, which will cause the suction pressure to rise sharply and cause system pressure imbalance.

[0041] Therefore, when the number of compressors started changes, it will cause the system to malfunction. Therefore, in order to solve this problem, in this embodiment, the opening degree of the gas bypass valve is increased when the number of compressors started changes.

[0042] If the compressor starts, the suction pressure drops sharply. At this time, increasing the opening of the bypass valve allows the refrigerant at the evaporator outlet to bypass back to the compressor suction port, thereby increasing the refrigerant flow at the compressor suction port. This compensates for the drop in suction pressure caused by the increased compressor, thus maintaining the compressor suction pressure within a safe range and preventing compressor surge.

[0043] For example, when the compressor is turned off, the suction pressure rises sharply. At this time, the opening of the bypass valve is increased so that the suction flow can be bypassed to the evaporator outlet through the bypass valve, thereby reducing the suction pressure to offset the increase in suction pressure caused by reducing the compressor. The bypass valve is used to balance the pressure in the system.

[0044] Step S40: If it is determined from the real-time operating status data that there is no change in the number of compressors started, then the compressor control parameters in the real-time operating status data are obtained, and the opening degree of the gas bypass valve is adjusted according to the compressor control parameters.

[0045] When there is no compressor start-up quantity, there is no need to directly increase the opening degree of the gas bypass valve; however, in the actual operation of the compressor, there are specific requirements for the opening degree of the gas bypass valve based on the actual operating scenario. Therefore, in this embodiment, the opening degree of the gas bypass valve is adjusted by the compressor control parameters so that the opening degree of the gas bypass valve can meet the specific application scenario.

[0046] This embodiment determines the change in the number of compressors started by monitoring the real-time operating status. This allows the opening of the bypass valve to be increased when the number of compressors starts changes, thereby addressing the system instability caused by changes in the number of compressors. At the same time, when the number of compressors started is stable, the opening of the bypass valve is further adjusted based on the compressor control parameters, so that the opening of the bypass valve can adapt to the adjustment needs of the compressor, thus achieving accurate control of the bypass valve in a dual-compressor scenario.

[0047] Further details will follow. Figure 2 In the second embodiment of the air conditioning system control method of the present invention based on the first embodiment, step S20 includes the following steps: Step S21: When it is determined that the air conditioner is in the start-up phase based on the real-time operating status data, determine the compressor start-up sequence of the real-time operating status data. Step S22: Determine the start time corresponding to the compressor start sequence; Step S23: At the startup time, it is determined that there is a change in the number of compressors starting.

[0048] The air conditioner startup phase is the initial stage when the air conditioner transitions from the off state to the startup state.

[0049] It is understandable that during the air conditioner startup phase, the compressor needs to be switched from off to on; therefore, there will inevitably be a change in the number of compressors starting.

[0050] The compressor start-up sequence is used to indicate when the compressor starts.

[0051] It is understandable that during the start-up phase of the air conditioning system, the first compressor and the second compressor can start simultaneously or separately.

[0052] When the first compressor and the second compressor start simultaneously, the start-up time of the first compressor and the second compressor is the same; When the first compressor and the second compressor are started separately, the start-up times of the first compressor and the second compressor are different.

[0053] At startup, the compressor starts; at this time, the number of compressors starting increases, therefore, it can be determined that there is a change in the number of compressors starting.

[0054] In this embodiment, by monitoring the compressor start-up time, it is possible to accurately monitor the timing of changes in the number of compressor starts, thereby achieving accurate on / off control of the gas bypass valve.

[0055] Furthermore, in the third embodiment of the air conditioning system control method of the present invention based on the first embodiment, step S30 includes the following steps: Step S31: If it is determined from the real-time operating status data that the air conditioner is in the start-up phase, then the first start-up time of the first compressor and the second start-up time of the second compressor are determined from the real-time operating status data. Step S32: At the first start-up moment, increase the opening degree of the gas bypass valve to a first preset degree; Step S33: At the second start-up time, increase the opening degree of the gas bypass valve to a second preset degree.

[0056] The first preset opening degree is the opening degree that is pre-set based on the starting setting of the first compressor.

[0057] The second preset opening degree is a pre-set opening degree based on the second compressor start-up settings.

[0058] In this embodiment, the first compressor is the compressor that starts first during the air conditioner startup phase, and the second compressor is the compressor that starts after the air conditioner startup phase.

[0059] In this embodiment, the first compressor and the second compressor are started separately.

[0060] At the initial startup, the first compressor starts while the second compressor remains off. At this moment, the compressor's refrigerant handling capacity increases from 0 to one unit. The refrigerant flow rate in the pipeline cannot immediately increase to match the system demand after the compressor is added, which leads to a sharp drop in suction pressure and causes compressor surge. The bypass valve increases its first preset opening from closed. The bypass valve bypasses the refrigerant at the evaporator outlet back to the compressor's suction port, thereby increasing the refrigerant flow rate at the compressor's suction port. This compensates for the drop in suction pressure caused by the addition of the compressor, thus maintaining the compressor's suction pressure within a safe range and preventing compressor surge.

[0061] After the first compressor starts, the system is in a stable state. Simultaneously, the bypass valve maintains its first preset opening. When the second start-up time arrives, the first compressor remains on, while the second compressor switches from off to on. The compressor's refrigerant handling capacity increases from one unit to two units. The refrigerant flow rate in the pipeline cannot immediately increase to match the system demand after adding the compressor, leading to a sharp drop in suction pressure and compressor surge. The bypass valve increases its second preset opening based on the first. The bypass valve redirects more refrigerant from the evaporator outlet back to the compressor's suction port, increasing the refrigerant flow rate at the compressor's suction port. This compensates for the drop in suction pressure caused by adding the compressor, maintaining the compressor's suction pressure within a safe range and preventing compressor surge.

[0062] In other embodiments, if the first compressor and the second compressor are started simultaneously at the third start-up time during the air conditioning start-up phase, the opening degree of the gas bypass valve is increased to a third preset opening degree at the third start-up time.

[0063] The specific values ​​of the first preset opening, the second preset opening, and the third preset opening can be set based on actual needs.

[0064] In this embodiment, by increasing the opening degree of the bypass valve at the first startup time and the second startup time respectively, the system stability of the air conditioning system during the startup phase can be guaranteed, and the surge problem caused by compressor startup can be avoided.

[0065] Furthermore, step S33 is followed by the following step: Step S34: Determine whether the air conditioning system has finished starting based on the real-time operating status data; Step S35: If the air conditioning system has finished starting, obtain the preset reduction step size; Step S36: Reduce the opening of the air bypass valve by a preset reduction step size at preset time intervals until the air bypass valve is closed.

[0066] After the air conditioning system is started, the unit enters the capacity adjustment phase.

[0067] It is understandable that the purpose of opening the bypass valve during the air conditioner startup phase is to increase the compressor's suction pressure; after the air conditioner system has started and is running stably, there is no problem with the compressor having too low suction pressure.

[0068] Meanwhile, the bypass valve bypasses the refrigerant from the evaporator outlet to the compressor suction port, meaning that this portion of the refrigerant does not undergo heat exchange through the evaporator. Therefore, if the bypass valve remains open, the amount of refrigerant undergoing heat exchange in the system will decrease, thus affecting the cooling effect. Therefore, after the air conditioning system has been started, the bypass valve needs to be closed to ensure the cooling effect.

[0069] In practical applications, if the bypass valve is closed directly, the refrigerant output to the compressor will be directly blocked, and the amount of refrigerant at the compressor suction port will decrease sharply. This will lead to a rapid drop in the compressor suction pressure, resulting in surge or system pressure imbalance.

[0070] Therefore, in order to avoid pressure shock when the bypass valve is closed, this embodiment sets a preset reduction step size and a preset time. Every preset time interval, the opening of the bypass valve is reduced by the preset reduction step size. By reducing the preset reduction step size multiple times, the opening of the bypass valve is gradually reduced to 0, that is, closed. This achieves a smooth closure of the bypass valve, avoids large changes in the pressure at the compressor suction port, and ensures system stability.

[0071] The preset reduction step size is the adjustment value for reducing the opening of the air bypass valve.

[0072] The specific values ​​for the preset reduction step size and preset time can be set based on actual needs.

[0073] Furthermore, in the fourth embodiment of the air conditioning system control method of the present invention based on the first embodiment of the present invention, step S20 includes the following steps: Step S24: Determine whether the compressor has triggered a safety unloading based on the real-time operating status data; Step S25: If a compressor triggers a safety unloading, then it is determined that there is a change in the number of compressors started.

[0074] Safe unloading is an unloading operation performed when the compressor triggers safety protection.

[0075] When the air conditioning system is running, there may be a problem of excessive exhaust pressure, so high pressure protection is set. When the compressor exhaust pressure exceeds a certain value, the high pressure protection is triggered, and the compressor is unloaded.

[0076] There may be a problem with the suction pressure being too low, so a low-pressure protection is set. When the suction pressure of the compressor is less than a certain value, the low-pressure protection is triggered, and the compressor is unloaded.

[0077] There may be a problem with excessive compressor current, so current protection is set up. When the compressor drive current exceeds a certain value, the current protection is triggered, and the compressor is unloaded.

[0078] First, when a safety unloading is triggered, the number of compressors starting decreases, so system stability is maintained by increasing the opening of the bypass valve.

[0079] At the same time, opening the bypass valve can also alleviate the reasons that lead to safe unloading.

[0080] If the high-pressure protection is triggered and the compressor's discharge port pressure is too high, the opening of the bypass valve is increased to allow the refrigerant at the evaporator outlet to bypass back to the compressor's suction port, thereby reducing the ratio of discharge pressure to suction pressure, i.e., reducing the compressor's compressor ratio, to alleviate the discharge pressure.

[0081] For example, when the low-pressure protection is triggered, the compressor's suction port pressure is too low. At this time, the opening degree of the bypass valve is increased so that the refrigerant at the evaporator outlet can be bypassed back to the compressor's suction port, thereby increasing the compressor's suction pressure.

[0082] For example, when the current protection is triggered, the compressor current is relatively large. At this time, the opening degree of the gas bypass valve is increased so that the refrigerant at the evaporator outlet can be bypassed back to the compressor's suction port, thereby reducing the ratio of the discharge pressure to the suction pressure, that is, reducing the compressor's compressor ratio, thereby reducing the compressor power and causing the current to drop.

[0083] In this embodiment, by increasing the opening of the bypass valve when the safety unloading is triggered, the safety unloading problem can be alleviated while stabilizing the system pressure.

[0084] Furthermore, in the fifth embodiment of the air conditioning system control method of the present invention based on the first embodiment of the present invention, step S20 includes the following steps: Step S26: Determine whether to trigger the air conditioning system to shut down based on the real-time operating status data; Step S27: If the air conditioning system is triggered to shut down, it is determined that there is a change in the number of compressors started.

[0085] It is understandable that during the air conditioner shutdown phase, the compressor needs to be switched from on to off; therefore, there will inevitably be a change in the number of compressors starting.

[0086] It is understandable that during the air conditioning system shutdown phase, the first compressor and the second compressor can be shut down simultaneously or separately.

[0087] When the first compressor and the second compressor are turned off simultaneously, the first compressor and the second compressor turn off at the same time. When the first compressor and the second compressor are shut down separately, the shutdown times of the first compressor and the second compressor are different.

[0088] At the shutdown time, the compressor performs a shutdown operation; at this time, the number of compressors started decreases, therefore, it can be determined that there is a change in the number of compressors started.

[0089] To ensure a stable shutdown of the air conditioning system, close the bypass valve after the preset shutdown time has been reached.

[0090] In this embodiment, monitoring is performed by shutting down the air conditioning system, which enables accurate monitoring of the timing of changes in the number of compressor starts, thereby achieving accurate on / off control of the gas bypass valve.

[0091] Furthermore, in the sixth embodiment of the air conditioning system control method of the present invention based on the first embodiment, step S40 includes the following steps: Step S41: Obtain the compressor increment from the real-time operating status data; Step S42: Determine the opening adjustment value corresponding to the compressor increment, wherein the compressor increment is negatively correlated with the opening adjustment value.

[0092] The compressor increment indicator controls the compressor's frequency adjustment. The compressor increment can be set based on actual needs; for example, when the compressor is based on PID control, the compressor increment is the PID increment. The PID increment can indicate the increase, decrease, or maintenance of the compressor's cooling capacity.

[0093] When the compressor increment indicator shows an increase in the compressor's cooling capacity, the compressor is loaded. At this time, the air conditioning system needs more cooling capacity. If the gas bypass valve is open or the opening is too large, it will result in an increase in refrigerant that has not undergone heat exchange, which does not meet the needs of the air conditioning system. Therefore, when the compressor increment indicator shows an increase in the compressor's cooling capacity, the opening of the gas bypass valve is reduced, that is, the opening adjustment value is set to a negative value.

[0094] When the compressor incremental indicator shows that the compressor frequency remains unchanged, the compressor maintains its load. Therefore, the current opening of the bypass valve can be maintained, i.e., the opening adjustment value is set to 0.

[0095] When the compressor increment indicator shows a decrease in compressor cooling capacity, the compressor is unloaded. At this time, the air conditioning system requires less cooling capacity. Therefore, by increasing the opening of the bypass valve, the amount of refrigerant that has not undergone heat exchange can be increased, thereby reducing the cooling capacity to meet the needs of the air conditioning system. Therefore, when the compressor increment indicator shows a decrease in compressor cooling capacity, the opening of the bypass valve is increased, that is, the opening adjustment value is set to a positive value.

[0096] Therefore, in this embodiment, the compressor increment and the opening adjustment value are set to be negatively correlated, so as to meet the operating requirements of the air conditioning system.

[0097] Furthermore, when the compressor increment indicates an increase in compressor cooling capacity, the opening of the bypass valve is reduced first. After the bypass valve is reduced to closed, if the compressor increment still indicates an increase in compressor cooling capacity, the compressor cooling capacity can be further increased by adjusting the compressor guide vanes. If the compressor increment still indicates an increase in compressor cooling capacity after reaching the control limit of the guide vanes, the compressor cooling capacity can be further increased by adjusting the compressor frequency. This ensures that the reduction in cooling capacity caused by the bypass valve is eliminated first, then the components on the compressor are adjusted, and finally the compressor itself is adjusted, thus avoiding large fluctuations in the system.

[0098] When the compressor increment indicates a decrease in compressor cooling capacity, the compressor frequency is adjusted first to reduce the cooling capacity. If the compressor increment still indicates a decrease in cooling capacity after reaching the frequency control limit, the compressor guide vanes are further adjusted to reduce the cooling capacity. If the guide vanes control limit is reached, the opening of the bypass valve is further increased to reduce the cooling capacity. This allows the cooling capacity to be reduced based on the compressor's own frequency to reduce compressor power consumption before adjusting the guide vanes and bypass valve.

[0099] See Figure 2 The overall process of this application is described below: 1. During the compressor startup process, when the startup sequence of the first compressor and the second compressor is set to run synchronously, the opening degree of the gas bypass valve is opened to the initial opening degree setting value of the gas bypass valve, that is, the third preset opening degree, and it is opened only once. When the startup sequence of the first compressor and the second compressor is set to run sequentially, during the startup process of the first compressor, the gas bypass valve opens to the initial opening setting of the gas bypass valve, i.e., the first preset opening. During the startup process of the second compressor, the gas bypass valve opens to the second preset opening.

[0100] 2. When the unit enters capacity regulation, the opening of the gas bypass valve is reduced according to the sampling cycle, decreasing the opening size every cycle according to the preset reduction step size, until it reaches 0%.

[0101] Then determine whether the current system is in a safe unloading state, such as high-pressure unloading, low-pressure unloading, or current unloading. If any compressor meets the safe unloading conditions, the target opening degree of the gas bypass valve increases by K; if the current system is not in a safe unloading state, then proceed with the normal capacity regulation process.

[0102] 3. Determine the incremental value of the capability PID Yn.

[0103] When Yn>0, first reduce the opening of the bypass valve to the minimum value per cycle according to the amplitude of K, and then adjust the guide vane and frequency. The adjustment priority is: bypass valve > guide vane > frequency. When Yn=0, the opening degree of the air bypass valve remains unchanged; When Yn<0, first adjust the guide vane and frequency to the minimum value, and then increase K to the maximum value every cycle. The adjustment priority is: frequency > guide vane > air bypass valve.

[0104] 4. See Figure 3 During the compressor shutdown process, the air bypass valve opening is forcibly increased to the initial opening setting value. After the main motor is turned off for T seconds, the air bypass valve closes to 0%.

[0105] This application reasonably controls the opening of the gas bypass valve. When the air conditioning system is under low load or fluctuating operating conditions, by adjusting the refrigerant bypass flow, the compressor operation is stabilized, surge is prevented, system pressure is balanced, and operating efficiency and safety are improved. This allows the air conditioning system to achieve a higher unit load and unit energy efficiency.

[0106] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0107] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0108] This application also provides an air conditioning system control device for implementing the above-described air conditioning system control method, the air conditioning system control device comprising: The first acquisition module is used to acquire real-time operating status data of the first compressor and the second compressor; The first judgment module is used to determine whether there is a change in the number of compressors started based on the real-time operating status data, wherein the number of compressors started is the number of compressors in the running state; The first determining module is used to increase the opening of the gas bypass valve if it is determined from the real-time operating status data that there is a change in the number of compressors started. The second determining module is used to, if it is determined from the real-time operating status data that there is no change in the number of compressors started, obtain the compressor control parameters in the real-time operating status data, and adjust the opening degree of the gas bypass valve according to the compressor control parameters.

[0109] This air conditioning system control device determines the change in the number of compressors started by monitoring the real-time operating status. This allows it to increase the opening of the bypass valve when the number of compressors starts changes, thus addressing system instability caused by changes in the number of compressors. Simultaneously, when the number of compressors started is stable, it further adjusts the opening of the bypass valve based on the compressor control parameters, ensuring that the opening of the bypass valve adapts to the adjustment needs of the compressors. This achieves accurate control of the bypass valve in dual-compressor scenarios.

[0110] It should be noted that the first acquisition module in this embodiment can be used to execute step S10 in this application embodiment, the first judgment module in this embodiment can be used to execute step S20 in this application embodiment, the first determination module in this embodiment can be used to execute step S30 in this application embodiment, and the second determination module in this embodiment can be used to execute step S40 in this application embodiment.

[0111] Furthermore, the first determination module includes: The first determining unit is used to determine the compressor start-up sequence of the real-time operating status data when the air conditioner is in the start-up phase, based on the real-time operating status data. The second determining unit is used to determine the start-up time corresponding to the compressor start-up sequence; The third determining unit is used to determine, at the startup time, whether there is a change in the number of compressors starting.

[0112] Furthermore, the first determining module includes: The fourth determining unit is used to determine the first start time of the first compressor and the second start time of the second compressor based on the real-time operating status data if it is determined that the air conditioner is in the start-up phase based on the real-time operating status data. The first lifting unit is used to increase the opening degree of the gas bypass valve to a first preset opening degree at the first start-up time; The second lifting unit is used to increase the opening degree of the gas bypass valve to a second preset degree at the second start-up time.

[0113] Furthermore, the second lifting unit includes: The first judgment subunit is used to increase the opening degree of the gas bypass valve to a second preset opening degree and then determine whether the air conditioning system has been started up based on the real-time operating status data. The first acquisition subunit is used to acquire a preset reduction step size if the air conditioning system has finished starting. The first reduction subunit is used to reduce the opening of the gas bypass valve by a preset reduction step size at preset time intervals until the gas bypass valve is closed.

[0114] Furthermore, the first determination module includes: The fifth determining unit is used to determine whether the compressor has triggered a safety unloading based on the real-time operating status data; The sixth determining unit is used to determine if there is a change in the number of compressors started if a compressor triggers a safety unloading.

[0115] Furthermore, the first determination module includes: The seventh determining unit is used to determine whether to trigger the air conditioning system to shut down based on the real-time operating status data; The eighth determining unit is used to determine if there is a change in the number of compressors started if the air conditioning system is triggered to shut down.

[0116] Furthermore, the second determining module includes: The first acquisition unit is used to acquire the compressor increment in the real-time operating status data; The ninth determining unit is used to determine the opening adjustment value corresponding to the compressor increment, wherein the compressor increment is negatively correlated with the opening adjustment value.

[0117] Reference Figure 4 In terms of hardware structure, the air conditioning system may include components such as a communication module 10, a memory 20, and a processor 30. In the air conditioning system, the processor 30 is connected to both the memory 20 and the communication module 10. The memory 20 stores a computer program, which is executed by the processor 30. When the computer program is executed, it implements the steps of the above-described method embodiment.

[0118] The communication module 10 can connect to external communication devices via a network. The communication module 10 can receive requests from the external communication devices and can also send requests, instructions, and information to the external communication devices. The external communication devices can be other air conditioning systems, servers, or IoT devices, such as televisions, etc.

[0119] The memory 20 can be used to store software programs and various data. The memory 20 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as acquiring real-time operating status data of the first and second compressors), etc.; the data storage area may include a database, and may store data or information created based on system usage. Furthermore, the memory 20 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0120] Processor 30 is the control center of the air conditioning system. It connects to various parts of the system via various interfaces and lines. By running or executing software programs and / or modules stored in memory 20, and by calling data stored in memory 20, it performs various functions and processes data, thereby providing overall monitoring of the air conditioning system. Processor 30 may include one or more processing units; optionally, processor 30 may integrate an application processor and a modem processor. The application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into processor 30.

[0121] although Figure 4 Not shown, but the above-described air conditioning system may further include a circuit control module, which is used to connect to a power source to ensure the normal operation of other components. Those skilled in the art will understand that... Figure 4 The air conditioning system structure shown does not constitute a limitation on the air conditioning system and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0122] The present invention also proposes a computer-readable storage medium having a computer program stored thereon. The computer-readable storage medium may be... Figure 4 The memory 20 in the air conditioning system may also be at least one of ROM (Read-Only Memory) / RAM (Random Access Memory), magnetic disk, optical disk, etc. The computer-readable storage medium includes a number of instructions to cause a terminal device with a processor (which may be a television, automobile, mobile phone, computer, server, terminal, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0123] In this invention, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0124] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0125] Although embodiments of the present invention have been shown and described above, the scope of protection of the present invention is not limited thereto. It is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, and substitutions to the above embodiments within the scope of the present invention, and such changes, modifications, and substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning system control method characterized by comprising: The air conditioning system comprises two compressors; the air conditioning system control method comprises: obtaining real-time running state data of the first compressor and the second compressor; determining whether there is a change in the number of compressors started according to the real-time running state data, wherein the number of compressors started is the number of compressors in the running state; if it is determined according to the real-time running state data that there is a change in the number of compressors started, increasing the opening degree of the gas bypass valve; if it is determined according to the real-time running state data that there is no change in the number of compressors started, obtaining a compressor control parameter in the real-time running state data, and adjusting the opening degree of the gas bypass valve according to the compressor control parameter.

2. The air conditioning system control method of claim 1, wherein, The determination of whether there is a change in the number of compressors started according to the real-time running state data comprises: determining the compressor start timing of the real-time running state data when the air conditioner is in the start-up stage according to the real-time running state data; determining the start time corresponding to the compressor start timing; determining that there is a change in the number of compressors started at the start time.

3. The air conditioning system control method of claim 1, wherein, If it is determined according to the real-time running state data that there is a change in the number of compressors started, the opening degree of the gas bypass valve is increased, which comprises: if it is determined according to the real-time running state data that the air conditioner is in the start-up stage, determining the first start time of the first compressor and the second start time of the second compressor according to the real-time running state data; at the first start time, increasing the opening degree of the gas bypass valve by a first preset opening degree; at the second start time, increasing the opening degree of the gas bypass valve by a second preset opening degree.

4. The air conditioning system control method of claim 3, wherein, After the opening degree of the gas bypass valve is increased by the second preset opening degree, it comprises: determining whether the air conditioning system is started according to the real-time running state data; if the air conditioning system is started, a preset reduction step is obtained; every interval of a preset time, the opening degree of the gas bypass valve is reduced by a preset reduction step until the gas bypass valve is closed.

5. The air conditioning system control method of claim 1, wherein, The determination of whether there is a change in the number of compressors started according to the real-time running state data comprises: determining whether there is a compressor triggered safety unloading according to the real-time running state data; if there is a compressor triggered safety unloading, it is determined that there is a change in the number of compressors started.

6. The air conditioning system control method of claim 1, wherein, The determination of whether there is a change in the number of compressors started according to the real-time running state data comprises: determining whether the air conditioning system is triggered to shut down according to the real-time running state data; if the air conditioning system is triggered to shut down, it is determined that there is a change in the number of compressors started.

7. The air conditioning system control method of claim 1, wherein, The adjustment of the opening degree of the gas bypass valve according to the compressor control parameter comprises: obtaining a compressor increment in the real-time running state data; determining an opening degree adjustment value corresponding to the compressor increment, wherein the compressor increment and the opening degree adjustment value are negatively correlated.

8. An air conditioning system control apparatus characterized by comprising: The air conditioning system control device comprises: a first obtaining module for obtaining real-time running state data of the first compressor and the second compressor; a first determining module for determining whether there is a change in the number of compressors started according to the real-time running state data, wherein the number of compressors started is the number of compressors in the running state; The first determining module is configured to increase the opening degree of the gas bypass valve if it is determined according to the real-time running state data that the number of compressor starts changes; The second determining module is configured to obtain a compressor control parameter in the real-time running state data and adjust the opening degree of the gas bypass valve according to the compressor control parameter if it is determined according to the real-time running state data that the number of compressor starts does not change.

9. An air conditioning system, characterised in that, The air conditioning system comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the computer program, when executed by the processor, implements the steps of the air conditioning system control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program, when executed by the processor, implements the steps of the air conditioning system control method according to any one of claims 1 to 7.

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