Control method of air conditioner, air conditioner and machine readable storage medium

Abstract

The invention relates to a control method of an air conditioner, the air conditioner and a machine readable storage medium. The air conditioner comprises N enthalpy-increasing compressors arranged in parallel, an enthalpy-increasing header pipe and N enthalpy-increasing branch pipes led out of the enthalpy-increasing header pipe, the enthalpy-increasing branch pipes are connected with air supply ports of the enthalpy-increasing compressors one by one, and each enthalpy-increasing branch pipe is provided with an air supply valve. N is an integer greater than or equal to 2. The control method comprises the steps that the exhaust temperature of each enthalpy-increasing compressor is obtained; and each gulp valve is controlled according to the difference value between the exhaust temperatures, so that the gas supply flow is distributed between the enthalpy increasing compressors. According to the control method, the difference value of the exhaust temperatures of the enthalpy-increasing compressors is reduced, and the effect of improving the stability of the air conditioning system is achieved. And the flexibility of the air conditioning system can be improved, and the capacity and energy efficiency of the air conditioning system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment equipment, and in particular to a control method for an air conditioner, an air conditioner and a machine-readable storage medium. Background Art

[0002] In the field of air handling equipment, for example, a dual-compressor VRF system can experience a temperature difference between the two compressors due to factors such as refrigerant flow, heat-increasing air flow, refrigerant splitting, and heat-increasing air splitting. Under severe operating conditions, this temperature difference can even exceed 20°C.

[0003] On the one hand, a large exhaust temperature difference may cause compressor oil temperature differences, which in turn affects the distribution of compressor oil and refrigerant, and undermines system stability. On the other hand, a large exhaust temperature difference may cause the compressor with higher exhaust temperature to prematurely trigger the exhaust high temperature protection, or cause the compressor with lower exhaust temperature to prematurely trigger the exhaust low temperature protection, which may cause the air conditioning system to shut down. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a control method for an air conditioner, an air conditioner and a machine-readable storage medium that overcome the above problems or at least partially solve the above problems, aiming to reduce the difference in exhaust temperature of each compressor in a multi-compressor air-conditioning system, thereby achieving the effect of improving the stability of the air-conditioning system.

[0005] Specifically, the present invention provides the following technical solutions:

[0006] A control method for an air conditioner, comprising N enthalpy-increasing compressors arranged in parallel, an enthalpy-increasing main pipe, and N enthalpy-increasing branch pipes extending from the enthalpy-increasing main pipe, each enthalpy-increasing branch pipe being connected to an air supply port of each enthalpy-increasing compressor, and each enthalpy-increasing branch pipe being provided with an air supply valve. N is an integer greater than or equal to 2. The control method comprises:

[0007] Obtaining the exhaust temperature of each of the enthalpy-increasing compressors;

[0008] According to the difference between the exhaust gas temperatures, the air supply valves are controlled to distribute the air supply flow rate among the enthalpy-increasing compressors.

[0009] Optionally, the air supply valve is an electronic expansion valve, and

[0010] The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes:

[0011] According to the difference between the exhaust gas temperatures, the opening of each of the air supply valves is controlled to distribute the air supply flow rate among the enthalpy-increasing compressors.

[0012] Optionally, the air supply valve is an on-off valve, and

[0013] The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes:

[0014] According to the difference between the exhaust gas temperatures, the disconnection time of each of the air supply valves is controlled to distribute the air supply flow rate among the enthalpy increase compressors.

[0015] Optionally, the air supply valve is an on-off valve, and the control of the off-time of each air supply valve according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes:

[0016] Obtaining an average exhaust temperature of the exhaust temperatures;

[0017] Obtaining a disconnection time of each of the air supply valves according to a difference between each of the exhaust gas temperatures and the average exhaust gas temperature;

[0018] According to the respective disconnection durations, the respective air supply valves are controlled.

[0019] Optionally, the air supply valve is an on-off valve, and the control of the off-time of each air supply valve according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes:

[0020] Obtaining a maximum exhaust temperature among the exhaust temperatures;

[0021] Obtaining a disconnection time of each of the air supply valves according to a difference between each of the exhaust temperatures and the maximum exhaust temperature;

[0022] According to the respective disconnection durations, the respective air supply valves are controlled.

[0023] Optionally, the air supply valve is an on-off valve, and N=2.

[0024] The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes:

[0025] Get the preset maximum exhaust temperature difference threshold;

[0026] Perform the exhaust temperature differential adjustment procedure.

[0027] The exhaust temperature difference adjustment procedure includes:

[0028] determining whether a difference in exhaust temperature between the exhaust temperatures of the two enthalpy-increasing compressors is greater than or equal to a maximum exhaust temperature difference threshold;

[0029] If not, maintain the states of the two air supply valves, or exit the exhaust temperature difference adjustment program;

[0030] If so, determining the disconnection duration based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold;

[0031] According to the disconnection duration, the air supply valve corresponding to the smaller of the two exhaust temperatures is controlled to be disconnected.

[0032] Optionally, the determining of the disconnection duration based at least on a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold value includes:

[0033] Obtaining a preset minimum disconnection time of the air supply valve;

[0034] The disconnection duration is determined according to a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the minimum disconnection duration.

[0035] Optionally, the determining of the disconnection duration based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold includes:

[0036] Get temperature difference adjustment parameters;

[0037] The disconnection duration is determined based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter.

[0038] Optionally, determining the disconnection duration based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter, includes:

[0039] Obtaining a preset minimum disconnection time of the air supply valve;

[0040] In response to a product of a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold and the temperature difference adjustment parameter being less than the minimum disconnection time, the disconnection time is set to the minimum disconnection time.

[0041] Optionally, determining the disconnection duration based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter, includes:

[0042] Obtaining a preset maximum disconnection time of the air supply valve;

[0043] In response to a product of a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold and the temperature difference adjustment parameter being greater than the maximum disconnection time, the disconnection time is set to the maximum disconnection time.

[0044] Optionally, after the step of controlling the air supply valve corresponding to the smaller of the two exhaust temperatures according to the disconnection duration, the exhaust temperature difference adjustment program further includes:

[0045] Get the preset minimum exhaust temperature difference threshold;

[0046] Periodically acquiring the exhaust temperatures of the two enthalpy-increasing compressors according to a preset first time interval;

[0047] Determining whether the exhaust temperature difference in the current cycle is less than or equal to the minimum exhaust temperature difference threshold;

[0048] If so, maintain the states of the two air supply valves, or exit the exhaust temperature difference adjustment program;

[0049] If not, the temperature difference adjustment parameter is incrementally adjusted, and the incremental adjustment value is the product of a preset temperature difference adjustment parameter adjustment factor and the reciprocal of the temperature difference adjustment parameter of the current cycle; the temperature difference adjustment parameter adjustment factor is greater than 0;

[0050] The exhaust temperature difference adjustment procedure is executed again.

[0051] Optionally, after the step of controlling the air supply valve corresponding to the smaller of the two exhaust temperatures according to the disconnection duration, the method further comprises:

[0052] Get the preset minimum exhaust temperature difference threshold;

[0053] Periodically acquiring the exhaust temperatures of the two enthalpy-increasing compressors according to a preset first time interval;

[0054] In response to the exhaust temperature difference being less than or equal to the minimum exhaust temperature difference threshold value within M cycles, the exhaust temperature difference adjustment program is exited, and the two air supply valves are controlled to be opened; wherein M is a positive integer.

[0055] On the other hand, the present invention further provides a machine-readable storage medium having a machine-executable program stored thereon. When the machine-executable program is executed by a processor, the air conditioner control method as described above is implemented.

[0056] On the other hand, the present invention also provides an air conditioner, which includes a controller, the controller including a memory, a processor and a machine executable program stored in the memory and running on the processor, and when the processor executes the machine executable program, it implements the control method of the air conditioner as described above.

[0057] Optionally, the air conditioner is a multi-split air conditioner.

[0058] In the air conditioner control method, air conditioner, and machine-readable storage medium of the present invention, since the total amount of supplemental air flow in the enthalpy-increasing main pipe remains constant or varies only slightly, the difference in exhaust temperatures of each enthalpy-increasing compressor can be obtained to quantitatively control the opening degree or on-off duration of each corresponding supplemental air valve, thereby varying the supplemental air flow entering the supplemental air port of each enthalpy-increasing compressor, relieving the pressure on the enthalpy-increasing compressor with a higher exhaust temperature and increasing the load on the enthalpy-increasing compressor with a lower exhaust temperature. This reduces the difference in exhaust temperatures of each enthalpy-increasing compressor, thereby improving the stability of the air conditioning system.

[0059] On the other hand, by properly distributing the supplementary air flow among the heat-increasing compressors, the flexibility of the air-conditioning system can be increased, and the capacity and energy efficiency of the air-conditioning system can be improved.

[0060] Furthermore, the control method of the present invention can be applied to situations where the air supply valve is an on-off valve. The off-time of each air supply valve is determined by the difference in the exhaust temperature of each heat-increasing compressor, thereby reducing the difference in the exhaust temperature of each heat-increasing compressor. On-off valves are relatively low-cost and easy to control. Existing air-conditioning systems typically use on-off valves as air supply valves. When modifying an existing air-conditioning system to reduce the difference in the exhaust temperature of each heat-increasing compressor, the control method of the present invention can be directly applied to the existing air-conditioning system without changing or adding other components. The modification cost is relatively low, and the modification effect is relatively obvious.

[0061] Therefore, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Hereinafter, some specific embodiments of the present invention will be described in detail in an illustrative and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0063] Figure 1 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0064] Figure 2 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0065] Figure 3 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0066] Figure 4 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0067] Figure 5is a schematic flow chart of a control method according to one embodiment of the present invention;

[0068] Figure 6 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0069] Figure 7 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0070] Figure 8 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0071] Figure 9 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0072] Figure 10 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0073] Figure 11 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0074] Figure 12 is a schematic flow chart of a control method according to one embodiment of the present invention;

[0075] Figure 13 is a schematic structural diagram of an air conditioner according to one embodiment of the present invention;

[0076] Figure 14 is a schematic block diagram of a machine-readable storage medium according to one embodiment of the present invention;

[0077] Figure 15 is a schematic block diagram of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0078] Refer to the following Figures 1 to 15 The present invention will be described in detail with reference to an embodiment of the present invention to describe a method for controlling an air conditioner, a machine-readable storage medium, and an air conditioner. The terms "front," "rear," "upper," "lower," "top," "bottom," "inner," "outer," and "lateral" are used to indicate directions or positions based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the present invention.

[0079] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the definition of "first", "second", etc. can explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0080] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," "coupled," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0081] Figure 1 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention, and Figure 2-15 The present invention provides a control method for an air conditioner. The air conditioner includes N enthalpy-increasing compressors arranged in parallel, an enthalpy-increasing main pipe, and N enthalpy-increasing branch pipes extending from the enthalpy-increasing main pipe. Each enthalpy-increasing branch pipe is connected to an air supply port of each enthalpy-increasing compressor, and each enthalpy-increasing branch pipe is provided with an air supply valve. N is an integer greater than or equal to 2. The control method includes:

[0082] S100, obtaining the exhaust temperature of each enthalpy-increasing compressor;

[0083] S200 , controlling each air supply valve according to the difference between the exhaust gas temperatures to distribute the air supply flow rate among the enthalpy-increasing compressors.

[0084] In this embodiment, the air conditioner may include multiple compressors arranged in parallel, all of which are enthalpy-increasing compressors and share a single enthalpy-increasing main pipe. The air conditioner may also include multiple compressors arranged in parallel, N of which are enthalpy-increasing compressors and share a single enthalpy-increasing main pipe, with the remaining compressors being standard compressors. The air conditioner may also include multiple compressors arranged in parallel, multiple of which are enthalpy-increasing compressors, and N of the multiple enthalpy-increasing compressors sharing a single enthalpy-increasing main pipe. In other words, for the N enthalpy-increasing compressors, the total amount of air supplied to the enthalpy-increasing main pipe remains constant or varies minimally under certain conditions.

[0085] A temperature sensor can be set on the top of the enthalpy-increasing compressor to detect its exhaust temperature.

[0086] In this embodiment, the air supply valve can be an electronic expansion valve or an on-off valve, such as a solenoid on-off valve. The air supply valve can adjust its opening or on-off duration to change the air supply flow rate entering the air supply port of the corresponding heat-increasing compressor, thereby distributing the air supply flow rate among the heat-increasing compressors.

[0087] The exhaust temperature of the enthalpy-increasing compressor is affected by factors such as refrigerant flow, enthalpy-increasing air flow, refrigerant diversion, enthalpy-increasing air diversion, and may also be affected by factors such as pipeline shape, pipeline length, heating belt effect, and insulation conditions. Under harsh working conditions, such as low-temperature working conditions below -15°C, the exhaust temperature difference can even reach more than 20°C, which has a certain negative impact on the energy efficiency and reliability of the air-conditioning system. Large exhaust temperature differences can cause many problems. For example, if the temperatures of the two compressors are different, it will cause oil temperature differences, which will affect the compressor oil and refrigerant distribution, and affect the stability of the system. In terms of control, due to the large exhaust temperature difference, a high exhaust temperature will prematurely trigger the high exhaust temperature protection, and a low exhaust temperature will trigger the low exhaust temperature protection.

[0088] By increasing the air supply flow rate of the enthalpy-increasing compressor with a higher exhaust temperature, the pressure on the enthalpy-increasing compressor can be relieved and its exhaust temperature can be reduced. By reducing the air supply flow rate of the enthalpy-increasing compressor with a lower exhaust temperature, the load on the enthalpy-increasing compressor can be increased and its exhaust temperature can be increased.

[0089] In this embodiment, by obtaining and determining the exhaust temperature differences of each enthalpy-increasing compressor, the opening degree or on-off duration of each corresponding air supply valve can be quantitatively controlled, thereby varying the supply air flow rate entering the supply port of each enthalpy-increasing compressor, relieving the pressure on the enthalpy-increasing compressor with higher exhaust temperatures and increasing the load on the enthalpy-increasing compressor with lower exhaust temperatures. This reduces the exhaust temperature differences of each enthalpy-increasing compressor, thereby improving the stability of the air conditioning system.

[0090] On the other hand, by properly distributing the supplementary air flow among the heat-increasing compressors, the flexibility of the air-conditioning system can be increased, and the capacity and energy efficiency of the air-conditioning system can be improved.

[0091] In some embodiments of the control method of the present invention, the air supply valve is an electronic expansion valve, and

[0092] The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the heat-increasing compressors includes:

[0093] According to the difference between the exhaust gas temperatures, the opening of each air supply valve is controlled to distribute the air supply flow among the heat-increasing compressors.

[0094] In this embodiment, the air supply valves are electronic expansion valves, which quantitatively control the opening of each corresponding air supply valve based on the difference between the exhaust temperatures. For example, two enthalpy-increasing compressors can be selected, and based on the difference in their exhaust temperatures, the opening of the air supply valve of the compressor with the higher exhaust temperature can be quantitatively increased, and / or the opening of the air supply valve of the compressor with the lower exhaust temperature can be quantitatively decreased. This changes the air supply flow rate entering the air supply ports of each enthalpy-increasing compressor, thereby reducing the difference in exhaust temperatures between the compressors and improving the stability of the air conditioning system.

[0095] In some embodiments of the control method of the present invention, the air supply valve is an on-off valve, and

[0096] The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the heat-increasing compressors includes:

[0097] According to the difference between the exhaust gas temperatures, the disconnection time of each air supply valve is controlled to distribute the air supply flow among the heat-increasing compressors.

[0098] In this embodiment, the air supply valve is an on-off valve, such as an electromagnetic on-off valve, which quantitatively controls the on-off duration of each corresponding air supply valve based on the difference between the exhaust gas temperatures. For example, two enthalpy-increasing compressors can be selected, and based on the difference in their exhaust gas temperatures, the opening duration of the air supply valve of the compressor with the higher exhaust gas temperature can be quantitatively adjusted, and / or the opening duration of the air supply valve of the compressor with the lower exhaust gas temperature can be quantitatively reduced. This changes the air supply flow rate entering the air supply port of each enthalpy-increasing compressor, thereby reducing the difference in exhaust gas temperatures between the compressors and improving the stability of the air conditioning system.

[0099] Compared to electronic expansion valves, on-off valves are less expensive and easier to control. Existing air conditioning systems typically use on-off valves as air supply valves. When modifying existing air conditioning systems to reduce the difference in exhaust temperature between the heat-increasing compressors, the control method of the present invention can be directly applied to the existing system without having to change or add other components. This reduces modification costs and produces significant improvements.

[0100] In some embodiments of the control method of the present invention, as Figure 2 As shown, the air supply valve is an on-off valve. The off-time of each air supply valve is controlled according to the difference between the exhaust temperatures to distribute the air supply flow between the heat-increasing compressors, including:

[0101] S211, obtaining the average exhaust temperature of each exhaust temperature;

[0102] S212, obtaining the disconnection time of each air supply valve according to the difference between each exhaust gas temperature and the average exhaust gas temperature;

[0103] S213, controlling each air supply valve according to each disconnection duration.

[0104] In this embodiment, by obtaining the difference between each exhaust temperature and the average exhaust temperature, exhaust temperatures below the average exhaust temperature can be screened out. Based on the difference between the exhaust temperature and the average exhaust temperature, the corresponding air supply valve disconnection duration can be quantitatively determined. For example, the disconnection duration can be set to be positively correlated with or proportional to the difference between the exhaust temperature and the average exhaust temperature.

[0105] In this way, the air supply flow of each enthalpy-increasing compressor can be quantitatively adjusted according to the exhaust temperature, and the air supply flow can be distributed among the enthalpy-increasing compressors to reduce the difference in exhaust temperature of each enthalpy-increasing compressor and achieve the effect of improving the stability of the air-conditioning system.

[0106] In some embodiments of the control method of the present invention, as Figure 3 As shown, the air supply valve is an on-off valve. The off-time of each air supply valve is controlled according to the difference between the exhaust temperatures to distribute the air supply flow between the heat-increasing compressors, including:

[0107] S221, obtaining the maximum exhaust temperature among the exhaust temperatures;

[0108] S222, obtaining the disconnection time of each air supply valve according to the difference between each exhaust temperature and the maximum exhaust temperature;

[0109] S223, controlling each air supply valve according to each disconnection duration.

[0110] In this embodiment, by obtaining the difference between each exhaust temperature and the maximum exhaust temperature, exhaust temperatures with larger differences can be selected. For example, out of a total of N-1 sets of differences, no more than (N-1) / 2 sets of differences are selected. Based on the absolute value of the difference between the exhaust temperature and the maximum exhaust temperature, the corresponding air supply valve disconnection duration is quantitatively determined. For example, the disconnection duration can be set to be positively correlated with or proportional to the absolute value of the difference between the exhaust temperature and the maximum exhaust temperature.

[0111] In this way, the air supply flow of each enthalpy-increasing compressor can be quantitatively adjusted according to the exhaust temperature, and the air supply flow can be distributed among the enthalpy-increasing compressors to reduce the difference in exhaust temperature of each enthalpy-increasing compressor and achieve the effect of improving the stability of the air-conditioning system.

[0112] In some embodiments of the control method of the present invention, as Figure 4-5 As shown, the air supply valve is an on-off valve, and N=2.

[0113] The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the heat-increasing compressors includes:

[0114] S400: Obtaining a preset maximum exhaust temperature difference threshold value TA ;

[0115] S500: Execute the exhaust temperature difference adjustment program. The exhaust temperature difference adjustment program includes:

[0116] S510: Determine whether the exhaust gas temperature difference ΔT between the exhaust gas temperatures of the two enthalpy increasing compressors is greater than or equal to a maximum exhaust gas temperature difference threshold. If not, execute S520; if so, execute S530.

[0117] S520, maintaining the status of the two air supply valves, or exiting the exhaust temperature difference adjustment program;

[0118] S530, at least according to the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold value |ΔTT A ∣Determine the disconnection duration t m ;

[0119] S540: According to the disconnection duration, the air supply valve corresponding to the smaller of the two exhaust temperatures is controlled to be disconnected.

[0120] Dual-enthalpy-increasing compressor air conditioners that use an on-off valve as a gas-injection valve are relatively low-cost and simple to control, making them widely used. The optimized control scheme provided in this embodiment can be applied to newly designed and manufactured dual-enthalpy-increasing compressor air conditioners or to retrofit existing dual-enthalpy-increasing compressor air conditioners, reducing the difference in exhaust temperature between the various enthalpy-increasing compressors and improving the stability of the air conditioning system.

[0121] Specifically, the two enthalpy-increasing compressors can be designated as the first enthalpy-increasing compressor and the second enthalpy-increasing compressor, respectively. Their exhaust temperatures can be designated as Td1 and Td2, respectively. The exhaust temperature difference ΔT is calculated as |Td1-Td2|. The corresponding air supply valves for the first and second enthalpy-increasing compressors can be designated as SV1 and SV2, respectively.

[0122] In this embodiment, the maximum exhaust temperature difference threshold can be the upper threshold allowed by the air conditioning control system, or it can be set according to actual needs. It can generally be set to 3-5°C, preferably 3°C. If the exhaust temperature difference exceeds the maximum exhaust temperature difference threshold, it can easily cause system instability. The maximum exhaust temperature difference threshold can be preset in the air conditioner control system and read when needed.

[0123] In this embodiment, after entering the exhaust temperature difference adjustment program of an operation cycle, it is determined that ΔT ≥ T A Is true.

[0124] If △T<T A, indicating that the exhaust gas temperature difference between the two enthalpy-increasing compressors is within the normal range. At this point, if both air supply valves are connected, the exhaust gas temperature difference adjustment program can be controlled to exit. If one of the two air supply valves is disconnected, it can be maintained in that disconnected state.

[0125] If △T≥T A , indicating that the exhaust gas temperature difference between the two enthalpy-increasing compressors exceeds the normal range, and it is necessary to continue to perform the subsequent steps of the exhaust gas temperature difference adjustment procedure.

[0126] In this embodiment, the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold |ΔTT A |Determine the disconnection time t m For example, |△TT can be directly converted to A The value of | is assigned to t m . You can also use ∣△TT A The value of | is weighted and then assigned to t m , that is, t m =K p ∣△TT A ∣, where K p is the temperature difference adjustment parameter. Of course, we can also adjust ∣△TT A The value of ∣ is weighted and adjusted, and after adding the correction parameter, the value is assigned to t m , that is, t m =K p ∣△TT A |+b, where b is the correction parameter. In this way, the disconnection time t m It can accurately reflect the size of the exhaust gas temperature difference between the two enthalpy-increasing compressors, and can accurately reflect the size of the difference between the exhaust gas temperature difference and the maximum exhaust gas temperature difference threshold.

[0127] After determining the disconnection duration, the air supply valve corresponding to the lower of the two exhaust temperatures is controlled to disconnect. This increases the supply air flow to the enthalpy-increasing compressor corresponding to the higher exhaust temperature, alleviating its operating pressure and thereby lowering its exhaust temperature. Simultaneously, the supply air flow to the enthalpy-increasing compressor corresponding to the lower exhaust temperature is reduced, increasing its operating load and thereby raising its exhaust temperature.

[0128] Since the disconnection time reflects the exhaust temperature difference of the two heat-increasing compressors, after the air supply valve is disconnected and maintained for a certain period of time, the exhaust temperature difference of the two heat-increasing compressors will be reduced, thereby achieving the effect of improving the stability of the air-conditioning system.

[0129] In some embodiments of the control method of the present invention, as Figure 6 As shown, the method of determining the disconnection duration based on at least the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold value includes:

[0130] S611, obtaining the preset minimum disconnection time t of the air supply valve min ;

[0131] S612: Determine the disconnection time t according to the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold |ΔT-TA| and the minimum disconnection time. m .

[0132] The minimum disconnection duration can be set to the physical limit of the air supply valve. It can also be a system preset value to prevent system instability caused by excessive opening and closing of the air supply valve. Setting a minimum disconnection duration also prevents unusual noises from frequent opening and closing of the air supply valve, which can affect the user experience.

[0133] In this embodiment, t min Can be used as a correction parameter, for example, t can be set m =|△TT A ∣+t min , so as to ensure that the disconnection duration is always greater than the minimum disconnection duration.

[0134] In some embodiments of the control method of the present invention, as Figure 7 As shown, the method of determining the disconnection duration based on at least the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold value includes:

[0135] S621, obtain temperature difference adjustment parameter K p ;

[0136] S622, at least based on the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold |ΔTT A ∣, and temperature difference adjustment parameters to determine the disconnection time t m .

[0137] In this embodiment, the temperature difference adjustment parameter is typically a positive number. The temperature difference adjustment parameter can be a preset constant, set according to actual needs. The temperature difference adjustment parameter can also be a variable, with a preset initial value, so that when executing the exhaust temperature difference adjustment program, the value of the temperature difference adjustment parameter is updated or iterated to achieve more accurate or faster adjustment of the exhaust temperature difference.

[0138] The temperature difference adjustment parameter is used to adjust the ∣△TT A For example, t can be set to m =K p ∣△TT A ∣, so that the disconnection duration can accurately reflect the exhaust temperature difference. After the air supply valve is disconnected and maintained for a certain period of time, the exhaust temperature difference between the two enthalpy-increasing compressors will be reduced, thereby improving the stability of the air conditioning system.

[0139] It should be noted that when the temperature difference adjustment parameter is a variable, the preset initial value of the temperature difference adjustment parameter can be retrieved when the exhaust temperature difference adjustment program is first executed. The temperature difference adjustment parameter will be updated with an iterative value each time the exhaust temperature difference adjustment program is executed in a loop.

[0140] In some embodiments of the control method of the present invention, as Figure 8 As shown, the disconnection duration is determined based on at least the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter, including:

[0141] S631, obtaining the preset minimum disconnection time t of the air supply valve min ;

[0142] S632, in response to the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold |ΔTT A ∣ and temperature difference adjustment parameter K p Product K p ∣△TT A ∣ If it is less than the minimum disconnection time, the disconnection time will be t m Set to the minimum disconnection time.

[0143] In this embodiment, in the preliminary estimation, the disconnection time t m =K p ∣△TT A ∣. When K p ∣△TT A ∣Less than the minimum disconnection time t min When the disconnection time is set directly, m =t min . This is to avoid system instability caused by the air supply valve opening and closing too frequently, and to avoid abnormal noise from the air supply valve, which affects the user experience.

[0144] In some embodiments of the control method of the present invention, as Figure 9 As shown, the disconnection duration is determined based on at least the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter, including:

[0145] S641, obtaining the preset maximum disconnection time t of the air supply valve max ;

[0146] S642, in response to the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold |ΔTT A ∣ and temperature difference adjustment parameter K p Product K p ∣△TT A ∣If it is greater than the maximum disconnection duration, the disconnection duration will be set to the maximum disconnection duration.

[0147] The longest disconnection time is a system preset value, which is used to avoid system instability caused by one of the two air supply valves being disconnected for a long time.

[0148] In this embodiment, in the preliminary estimation, the disconnection time t m =K p ∣△TT A ∣. When K p ∣△TT A | Greater than the longest disconnection time t max When the disconnection time is set directly, m =t max . To avoid causing system instability.

[0149] In some embodiments of the control method of the present invention, as Figure 10 As shown, after the step of controlling the air supply valve corresponding to the smaller of the two exhaust temperatures according to the disconnection duration, the exhaust temperature difference adjustment program further includes:

[0150] S710, obtaining a preset minimum exhaust temperature difference threshold T B ;

[0151] S720, periodically obtaining the exhaust temperatures Td1 and Td2 of the two enthalpy-increasing compressors according to a preset first time interval Δt;

[0152] S730, determine whether the exhaust temperature difference ΔT of the current cycle is less than or equal to the minimum exhaust temperature difference threshold; if so, execute S740; if not, execute S750;

[0153] S740, maintaining the status of the two air supply valves, or exiting the exhaust temperature difference adjustment program;

[0154] S750, temperature difference adjustment parameter K p Perform incremental adjustment, the incremental adjustment value is the preset temperature difference adjustment parameter adjustment factor a and the temperature difference adjustment parameter K of the current cycle p The product of the reciprocals of a / K p ;The temperature difference adjustment parameter adjustment factor is greater than 0;

[0155] S760, execute the exhaust temperature difference adjustment procedure again.

[0156] Minimum exhaust temperature difference threshold T B The exit temperature for exiting the exhaust temperature difference control is usually set to be less than the maximum exhaust temperature difference threshold T A For example, when the maximum exhaust temperature difference threshold is set to 3°C, the minimum exhaust temperature difference threshold can be set to 1°C.

[0157] The temperature difference adjustment parameter adjustment factor a can be a preset constant and a positive number, which can be set according to actual needs.

[0158] After executing the exhaust temperature difference adjustment program for one cycle (i.e., controlling the opening of one air supply valve for a first time interval), if the exhaust temperature difference is detected to be less than or equal to the minimum exhaust temperature difference threshold, it can be considered that the adjustment expectation has been achieved for that cycle. The states of the two air supply valves can be maintained, or the exhaust temperature difference adjustment program can be exited.

[0159] In this embodiment, when it is detected that the exhaust temperature difference is greater than the minimum exhaust temperature difference threshold, it can be considered that the adjustment expectation is not achieved in this cycle. At this time, the temperature difference adjustment parameter will be incrementally adjusted. For example, according to K p =K p +a / K p Update the temperature difference adjustment parameter. In this way, when the exhaust temperature difference adjustment program cycle is subsequently executed, the value of the updated temperature difference adjustment parameter will be adjusted.

[0160] By a / K p is the incremental adjustment value, as K p As the value of becomes larger, the incremental adjustment value will decrease in each cycle to avoid overshoot.

[0161] In some embodiments of the control method of the present invention, as Figure 11 As shown, after the step of controlling the air supply valve corresponding to the smaller of the two exhaust temperatures according to the disconnection duration, the method further includes:

[0162] S810, obtaining a preset minimum exhaust temperature difference threshold T B ;

[0163] S820, periodically obtaining exhaust temperatures of two enthalpy-increasing compressors according to a preset first time interval Δt;

[0164] S830 , in response to the exhaust temperature difference ΔT being less than or equal to the minimum exhaust temperature difference threshold value within M cycles, exit the exhaust temperature difference adjustment program and control the opening of the two air supply valves; wherein M is a positive integer.

[0165] In this embodiment, M is a positive integer, preferably greater than or equal to 2. When the exhaust temperature difference is less than or equal to the minimum exhaust temperature difference threshold value within M cycles of the exhaust temperature difference adjustment program, or within a time period of MΔt, it can be confirmed that the exhaust temperature difference adjustment program has achieved the adjustment expectation, the program can be exited, and all air supply valves are controlled to open.

[0166] In some embodiments of the control method of the present invention, as Figure 12 As shown, the control method includes:

[0167] S901, start executing the exhaust temperature difference adjustment program to detect the exhaust temperatures Td1 and Td2 of the two enthalpy-increasing compressors;

[0168] S902, determine △T ≥ T A Is it true? If so, execute S903; if not, execute S910;

[0169] S903, set t m =K p ∣△TT A ∣+t min ;

[0170] S904, determine whether Td1>Td2 is true; if so, execute S905; if not, execute S906;

[0171] S905, disconnect SV2 for t m , execute S907;

[0172] S906, disconnect SV1 for t m , execute S907;

[0173] S907, detecting the exhaust temperatures Td1 and Td2 of the two enthalpy-increasing compressors at intervals Δt;

[0174] S908, determine △T≤T B Is it true? If so, execute S910; if not, execute S909;

[0175] S909, Update K p =K p +a / K p , and returns to execute S901;

[0176] S910: Maintain the status of the two air supply valves or exit the exhaust temperature difference adjustment program.

[0177] Figure 14 is a schematic diagram of a machine-readable storage medium 200 according to an embodiment of the present invention. Figure 14 As shown, an embodiment of the present invention further provides a machine-readable storage medium 200 on which a machine executable program 201 is stored. When the machine executable program 201 is executed by the processor 132, the air conditioner control method according to any one of the above embodiments or a combination of embodiments is implemented.

[0178] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any machine-readable storage medium 200 for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor 132, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or used in combination with these instruction execution systems, devices or apparatuses.

[0179] For the purposes of the description of this embodiment, the machine-readable storage medium 200 can be any device that can contain, store, communicate, propagate, or transmit a program for use with an instruction execution system, device, or apparatus, or in conjunction with such instruction execution systems, devices, or apparatuses. More specific examples (a non-exhaustive list) of the machine-readable storage medium 200 include the following: an electrical connection portion having one or more wirings (electronic device), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and editable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the machine-readable storage medium 200 can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, and then editing, interpreting, or processing in other suitable ways as necessary, and then storing it in a memory.

[0180] Figure 15 Schematic diagram of an air conditioner 100 according to an embodiment of the present invention, Figure 15 As shown, an embodiment of the present invention further provides an air conditioner 100, which includes a controller 130. The controller 130 includes a memory 131, a processor 132, and a machine executable program 201 stored in the memory 131 and running on the processor 132. When the processor 132 executes the machine executable program 201, the air conditioner control method according to any of the above embodiments is implemented.

[0181] In this embodiment, Figure 13 As shown, the air conditioner 100 includes N enthalpy-increasing compressors 110 arranged in parallel, an enthalpy-increasing main pipe 111, and N enthalpy-increasing branch pipes 112 extending from the enthalpy-increasing main pipe 111. Each enthalpy-increasing branch pipe 112 is connected to an air supply port 113 of each enthalpy-increasing compressor 110, and each enthalpy-increasing branch pipe 112 is provided with an air supply valve 114. By controlling the state of each air supply valve 114, the air supply flow rate entering each enthalpy-increasing compressor 110 can be changed and distributed.

[0182] By executing the control method of the present invention, the air conditioner can reduce the difference in exhaust temperature of each enthalpy-increasing compressor of the air conditioner, thereby improving the stability of the air conditioner system, increasing the flexibility of the air conditioner system, and improving the capacity and energy efficiency of the air conditioner system.

[0183] Specifically, the controller 130 may include a processor 132 adapted to execute stored instructions, and a memory 131 that provides temporary storage space for the operation of the instructions during operation. The processor 132 may be a single-core processor, a multi-core processor, a computing cluster, or any number of other configurations. The memory 131 may include random access memory (RAM), read-only memory, flash memory, or any other suitable storage system.

[0184] The processor 132 can be connected to an I / O interface (input / output interface) suitable for connecting the air conditioner 100 to one or more I / O devices (input / output devices) through a system interconnect (e.g., PCI, PCI-Express, etc.). The I / O devices may include, for example, a keyboard and a pointing device, wherein the pointing device may include a touch pad or a touch screen, etc.

[0185] Processor 132 can also be linked to a display interface suitable for connecting controller 130 to a display device through a system interconnection. Display device can include a display screen as a built-in component of controller 130. Display device can also include a computer monitor, television or projector, etc. that are externally connected to air conditioner 100. In addition, a network interface controller (NIC) can be suitable for connecting controller 130 to a network through a system interconnection. In certain embodiments, NIC can use any suitable interface or protocol (such as Internet Small Computer System Interface, etc.) to transmit data. The network can be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN) or the Internet, etc. Remote devices can be connected to controller 130 through a network.

[0186] In some embodiments of the air conditioner of the present invention, the air conditioner is a multi-split system. Multi-split systems have high heat exchange efficiency and are widely used. By implementing the control method of the present invention, the multi-split system can reduce the difference in exhaust temperature between the heat-increasing compressors in the multi-split system, thereby improving the stability of the multi-split system, increasing its flexibility, and enhancing its capacity and energy efficiency.

[0187] The flowchart provided in this embodiment is not intended to indicate that the operations of the method will be performed in any particular order, or that all operations of the method are included in all every case. In addition, the method may include additional operations. Within the scope of the technical ideas provided by the method of this embodiment, additional changes can be made to the above method.

[0188] The present invention has a plurality of exemplary embodiments, but, without departing from the spirit and scope of the present invention, many other variations or modifications that are consistent with the principles of the present invention can be directly determined or derived from the content disclosed in the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner includes N enthalpy-increasing compressors arranged in parallel, an enthalpy-increasing main pipe, and N enthalpy-increasing branch pipes extending from the enthalpy-increasing main pipe, each of the enthalpy-increasing branch pipes being connected one by one to an air supply port of each of the enthalpy-increasing compressors, and each of the enthalpy-increasing branch pipes being provided with an air supply valve; N is an integer greater than or equal to 2; and the control method includes: Obtaining the exhaust temperature of each of the enthalpy-increasing compressors; According to the difference between the exhaust gas temperatures, the air supply valves are controlled to distribute the air supply flow rate among the enthalpy-increasing compressors.

2. The control method according to claim 1, characterized in that: The air supply valve is an electronic expansion valve, and The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes: controlling the opening of each of the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow rate among the enthalpy-increasing compressors; or The air supply valve is an on-off valve, and The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes: According to the difference between the exhaust gas temperatures, the disconnection time of each of the air supply valves is controlled to distribute the air supply flow rate among the enthalpy increase compressors.

3. The control method according to claim 2, characterized in that: In the case where the air supply valve is an on-off valve, controlling the off time of each air supply valve according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy increasing compressors includes: Obtaining an average exhaust temperature of the exhaust temperatures; Obtaining a disconnection time of each of the air supply valves according to a difference between each of the exhaust gas temperatures and the average exhaust gas temperature; controlling each of the air supply valves according to the respective disconnection durations; or Obtaining a maximum exhaust temperature among the exhaust temperatures; Obtaining a disconnection time of each of the air supply valves according to a difference between each of the exhaust temperatures and the maximum exhaust temperature; According to the respective disconnection durations, the respective air supply valves are controlled.

4. The control method according to claim 1, wherein: The air supply valve is an on-off valve, and N=2; as well as The method of controlling the air supply valves according to the difference between the exhaust gas temperatures to distribute the air supply flow between the enthalpy-increasing compressors includes: Get the preset maximum exhaust temperature difference threshold; Executing an exhaust temperature difference adjustment program; the exhaust temperature difference adjustment program includes: determining whether a difference in exhaust temperature between the exhaust temperatures of the two enthalpy-increasing compressors is greater than or equal to a maximum exhaust temperature difference threshold; If not, maintain the states of the two air supply valves, or exit the exhaust temperature difference adjustment program; If so, determining the disconnection duration based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold; According to the disconnection duration, the air supply valve corresponding to the smaller of the two exhaust temperatures is controlled to be disconnected.

5. The control method according to claim 4, characterized in that: The determining of the disconnection duration based on at least the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold comprises: Obtaining a preset minimum disconnection time of the air supply valve; The disconnection duration is determined according to a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the minimum disconnection duration.

6. The control method according to claim 4, characterized in that: The determining of the disconnection duration based on at least the difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold comprises: Get temperature difference adjustment parameters; The disconnection duration is determined based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter.

7. The control method according to claim 6, characterized in that: The determining the disconnection duration based on at least a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold, and the temperature difference adjustment parameter, includes: Obtaining a preset minimum disconnection time of the air supply valve; In response to a product of a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold and the temperature difference adjustment parameter being less than the minimum disconnection time, setting the disconnection time to the minimum disconnection time; and / or Obtaining a preset maximum disconnection time of the air supply valve; In response to a product of a difference between the exhaust temperature difference and the maximum exhaust temperature difference threshold and the temperature difference adjustment parameter being greater than the maximum disconnection time, the disconnection time is set to the maximum disconnection time.

8. The control method according to claim 6, characterized in that: After the step of controlling the air supply valve corresponding to the smaller of the two exhaust temperatures according to the disconnection duration, the exhaust temperature difference adjustment program further includes: Get the preset minimum exhaust temperature difference threshold; Periodically acquiring the exhaust temperatures of the two enthalpy-increasing compressors according to a preset first time interval; Determining whether the exhaust temperature difference in the current cycle is less than or equal to the minimum exhaust temperature difference threshold; If so, maintain the states of the two air supply valves, or exit the exhaust temperature difference adjustment program; If not, the temperature difference adjustment parameter is incrementally adjusted, and the incremental adjustment value is the product of a preset temperature difference adjustment parameter adjustment factor and the reciprocal of the temperature difference adjustment parameter of the current cycle; the temperature difference adjustment parameter adjustment factor is greater than 0; The exhaust temperature difference adjustment procedure is executed again.

9. The control method according to claim 6, characterized in that: After the step of controlling the air supply valve corresponding to the smaller of the two exhaust temperatures according to the disconnection duration, the method further includes: Get the preset minimum exhaust temperature difference threshold; Periodically acquiring the exhaust temperatures of the two enthalpy-increasing compressors according to a preset first time interval; In response to the exhaust temperature difference being less than or equal to the minimum exhaust temperature difference threshold value within M cycles, the exhaust temperature difference adjustment program is exited, and the two air supply valves are controlled to be opened; wherein M is a positive integer.

10. An air conditioner, characterized in that: The invention comprises a controller, wherein the controller comprises a memory, a processor and a machine executable program stored in the memory and running on the processor, and when the processor executes the machine executable program, the control method of the air conditioner according to any one of claims 1 to 9 is implemented.

11. The air conditioner according to claim 9, characterized in that The air conditioner is a multi-split air conditioner.

12. A machine-readable storage medium, characterized in that A machine executable program is stored thereon, and when the machine executable program is executed by a processor, the control method of the air conditioner according to any one of claims 1 to 9 is implemented.

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