Control method of air conditioning system and air conditioning system

Abstract

This invention relates to the field of air conditioning, specifically providing a control method and system for an air conditioning system, aiming to solve the problem that existing air conditioning systems cannot reasonably control the oil return volume of the compressor. To this end, the air conditioning system of this invention includes a compressor, a gas-liquid separator, and an oil return pipeline connecting the compressor and the gas-liquid separator. A regulating valve is provided on the oil return pipeline. The control method includes: after the air conditioning system is started, acquiring the actual operating parameter value Twb of the compressor; determining the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor; and based on the determination result, controlling the opening degree of the regulating valve.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and specifically provides a control method for an air conditioning system and an air conditioning system. Background Technology

[0002] With technological advancements, air conditioners have become a common household appliance. An air conditioning system includes a refrigerant circuit, on which a compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger are sequentially arranged. A gas-liquid separator is typically installed between the compressor and the indoor heat exchanger, and an oil return pipe is usually connected between the gas-liquid separator and the compressor. The lubricating oil in the gas-liquid separator returns to the compressor through this pipe. Some designs incorporate a solenoid valve on the oil return pipe; however, since solenoid valves can only control the on / off state, not the opening degree, the amount of oil returned cannot be controlled. Furthermore, the compressor's oil requirements vary under different operating conditions. If the oil return is not properly controlled—for example, excessive oil return will increase compressor power, while insufficient oil return will cause internal wear on the compressor.

[0003] Accordingly, there is a need in the art for a new control method and air conditioning system for an air conditioning system to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that existing air conditioning systems cannot reasonably control the amount of oil returning to the compressor.

[0005] In a first aspect, the present invention provides a control method for an air conditioning system, the air conditioning system including a compressor, a gas-liquid separator, and an oil return pipeline connecting the compressor and the gas-liquid separator, characterized in that a regulating valve is provided on the oil return pipeline, and the control method includes: after the air conditioning system is started, acquiring the actual operating parameter value Twb of the compressor; determining the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor; and controlling the opening degree of the regulating valve based on the determination result.

[0006] In the preferred embodiment of the control method for the above-mentioned air conditioning system, the operating parameter value is the power value.

[0007] In a preferred embodiment of the control method for the aforementioned air conditioning system, the control method further includes: after the air conditioning system is started, controlling the initial opening of the regulating valve to be equal to the initial opening of the throttle valve of the air conditioning system; the step of "controlling the opening of the regulating valve based on the judgment result" further includes: when Twa>Twb and ΔTw1≥Tw1, controlling the opening of the regulating valve to be greater than the opening of the throttle valve; wherein, ΔTw1=(Twa-Twb) / Twa*100%, and Tw1 is a preset percentage.

[0008] In a preferred embodiment of the control method for the aforementioned air conditioning system, the control method further includes: after the air conditioning system is started, controlling the initial opening of the regulating valve to be equal to the initial opening of the throttle valve of the air conditioning system; the step of "controlling the opening of the regulating valve based on the judgment result" further includes: when Twa < Twb and ΔTw2 ≥ Tw1, controlling the opening of the regulating valve to be less than the opening of the throttle valve; wherein, ΔTw2 = (Twb - Twa) / Twa * 100%, and Tw1 is a preset percentage.

[0009] In a preferred embodiment of the control method for the air conditioning system described above, the control method further includes: after the air conditioning system is started, controlling the initial opening of the regulating valve to be equal to the initial opening of the throttle valve of the air conditioning system; the step of "controlling the opening of the regulating valve based on the judgment result" further includes: when Twa = Twb, controlling the opening of the regulating valve to continue to be equal to the opening of the throttle valve.

[0010] In the preferred embodiment of the control method for the above-mentioned air conditioning system, the step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: when ΔTw1 < Tw1, controlling the opening degree of the regulating valve to continue to be equal to the opening degree of the throttle valve.

[0011] In the preferred embodiment of the control method for the above-mentioned air conditioning system, the step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: when ΔTw2 < Tw1, controlling the opening degree of the regulating valve to continue to be equal to the opening degree of the throttle valve.

[0012] In the preferred embodiment of the control method for the above-mentioned air conditioning system, the air conditioning system further includes a temperature sensor for detecting the indoor ambient temperature. Before the step of "determining the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor", the control method further includes: acquiring the indoor ambient temperature; acquiring the indoor set temperature; and determining the theoretical operating parameter value of the compressor based on the indoor ambient temperature and the indoor set temperature.

[0013] In the preferred embodiment of the control method for the aforementioned air conditioning system, the step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: when ΔTw3 > Twa, controlling the opening degree of the regulating valve to be KTwa / ΔTw3; and / or when 0 < ΔTw3 < Twa, controlling the opening degree of the regulating valve to be KΔTw3 / Twa; and / or when ΔTw3 < 0, controlling the opening degree of the regulating valve to be K(-ΔTw / Twa+1); and / or when ΔTw3 = Twa, controlling the opening degree of the regulating valve to be: the initial opening degree of the regulating valve minus a fourth preset opening degree value; wherein, ΔTw3 = Twb - Twa; K is the initial opening degree of the regulating valve; the value range of the fourth preset opening degree value is 4-6 pls; and the value range of the initial opening degree is 200-480 pls.

[0014] In another aspect, the present invention also provides an air conditioning system, which includes a compressor, a gas-liquid separator, and an oil return line connecting the compressor and the gas-liquid separator. The oil return line is provided with a regulating valve. The air conditioning system also includes a memory and a processor. The memory is adapted to store multiple program codes, which are adapted to be loaded and run by the processor to perform the control method of the air conditioning system described in any of the above embodiments.

[0015] The air conditioning system of this invention includes a compressor, a gas-liquid separator, and an oil return pipeline connecting the compressor and the gas-liquid separator. A regulating valve is installed on the oil return pipeline. The control method includes: after the air conditioning system is started, acquiring the actual operating parameter value Twb of the compressor; determining the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor; and controlling the opening degree of the regulating valve based on the determination result. Under the premise of adopting the above technical solution, the opening degree of the regulating valve is directly related to the amount of oil returned by the compressor. That is, the larger the opening degree of the regulating valve, the larger the amount of oil returned by the compressor; the smaller the opening degree of the regulating valve, the smaller the amount of oil returned by the compressor. In actual operation of the compressor, the amount of oil return affects the actual power value of the compressor. That is, if the amount of oil return is small, the actual power value will be small, and if the amount of oil return is large, the actual power value will be large. The theoretical power value of this invention is directly related to the amount of oil return of the compressor. The theoretical power value can reflect the optimal amount of oil return of the compressor. Therefore, by comparing the actual power value with the theoretical power value, the opening of the regulating valve can be controlled, thereby keeping the amount of oil return of the compressor within an optimal range. Attached Figure Description

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0017] Figure 1 This is a schematic diagram of the air conditioning system of the present invention;

[0018] Figure 2 This is the main flowchart of the control method for the air conditioning system of the present invention;

[0019] Figure 3 This is a possible logic diagram of the control method for the air conditioning system of the present invention.

[0020] List of reference numerals in the attached diagram:

[0021] 1-Refrigerant circuit; 2-Outdoor heat exchanger; 3-Throttle valve; 4-Indoor heat exchanger; 5-Gas-liquid separator; 51-Inlet pipe; 52-Outlet pipe; 6-Compressor; 7-Oil return pipe; 8-Regulating valve. Detailed Implementation

[0022] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications.

[0023] To address the problem of existing air conditioning systems' inability to effectively control compressor oil return, this invention provides a control method for an air conditioning system, such as... Figure 1 As shown, this air conditioning system can be a multi-split air conditioning system or a single-cooling air conditioning system, etc. The air conditioning system includes a refrigerant circuit 1, on which an outdoor heat exchanger 2, a throttle valve 3, an indoor heat exchanger 4, a gas-liquid separator 5, and a compressor 6 are sequentially arranged. The gas-liquid separator 5 can be a top-inlet, bottom-outlet type gas-liquid separator 5. For example, the refrigerant in the refrigerant circuit 1 enters the gas-liquid separator 5 through the inlet pipe 51 at the top of the gas-liquid separator 5. The bottom of the gas-liquid separator 5 has an opening. One end of the outlet pipe 52 is located in the upper area inside the gas-liquid separator 5, and the other end is connected to the bottom opening. An oil return port can be set at the lower part of the outlet pipe 52 inside the gas-liquid separator 5. One end of the oil return pipe 7 is connected to the opening, and the other end is connected to the suction port of the compressor 6. A regulating valve 8 is set on the oil return pipe 7. Both the regulating valve 8 and the throttle valve 3 can be electronic expansion valves, etc. During the oil return process, the oil in the gas-liquid separator 5 enters the gas outlet pipe 52 through the oil return port, and then enters the compressor 6 under the influence of the refrigerant.

[0024] Of course, the structure of the gas-liquid separator 5 described above is merely exemplary, and the structure of the gas-liquid separator 5 can be adjusted; it can be any existing or future structure. As long as gas-liquid separation and oil return are achieved, it does not deviate from the principle of this invention and is within the protection scope of this invention.

[0025] In one possible implementation, the air conditioning system of the present invention further includes a temperature sensor for detecting the indoor ambient temperature. This sensor can be installed at the air outlet of the indoor heat exchanger 4 of the air conditioning system to accurately monitor the indoor ambient temperature.

[0026] like Figure 2 As shown, the control method of the air conditioning system of the present invention includes the following steps:

[0027] Step S100: After the air conditioning system is started, obtain the actual operating parameter value Twb of the compressor.

[0028] The operating parameters characterize the compressor's operating status, such as power or current values. When the actual operating parameter value is the actual power value, it can be calculated by detecting the compressor's input current and voltage. When the actual operating parameter value is the current value, it can be monitored by a current sensor. Of course, the above method is merely exemplary, and the acquisition method can be adjusted. For example, a power sensor can be set to directly obtain the compressor's actual power. These adjustments do not deviate from the principles of this invention and are all within the scope of protection of this invention.

[0029] Step S200: Determine the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor.

[0030] The theoretical operating parameter values ​​correspond to the actual operating parameter values. When the actual operating parameter value is the actual power value, the theoretical operating parameter value is the theoretical power value. When the actual operating parameter value is the actual current value, the theoretical operating parameter value is the theoretical current value. For ease of explanation, the actual operating parameter values ​​and theoretical operating parameter values ​​of this invention will be described using actual power values ​​as an example below. It should be noted that in the methods described below, actual power values ​​and actual current values ​​can be directly substituted, and theoretical power values ​​and theoretical current values ​​can be directly substituted.

[0031] As one possible implementation, the method for obtaining the theoretical power value of the present invention includes the following steps:

[0032] Obtain the indoor ambient temperature; obtain the indoor set temperature, and determine the theoretical power value of the compressor based on the indoor ambient temperature and the indoor set temperature.

[0033] The indoor temperature setting can be entered directly by the user or sent by the user through a control terminal, which can be a remote control or an app set on a mobile terminal such as a mobile phone, tablet, or computer.

[0034] Since the indoor ambient temperature and the set indoor temperature affect the compressor load, and the compressor load directly affects the compressor's operating frequency, the compressor's operating frequency is the biggest factor affecting its power. Therefore, the theoretical power of the compressor can be determined by the indoor ambient temperature and the set indoor temperature. For example, the greater the difference between the indoor ambient temperature and the set indoor temperature, the greater the theoretical power of the compressor; conversely, the smaller the difference, the smaller the theoretical power of the compressor.

[0035] The following section provides a detailed introduction to several possible methods for determining the theoretical power value.

[0036] In a first possible implementation, the air conditioning system can pre-store a first mapping relationship between the difference between the indoor ambient temperature value and the indoor set temperature value and the theoretical power value. After obtaining the indoor ambient temperature and the indoor set temperature, the difference between the indoor ambient temperature and the indoor set temperature is calculated, and then the theoretical power value corresponding to the difference is retrieved from the first mapping relationship.

[0037] In a second possible implementation, the air conditioning system can pre-store a second mapping relationship between indoor ambient temperature, indoor set temperature, and theoretical power value. After obtaining the indoor ambient temperature and indoor set temperature, the theoretical power value corresponding to the indoor ambient temperature and indoor set temperature can be retrieved from the second mapping relationship.

[0038] A third possible implementation involves an air conditioning system equipped with a pre-trained neural network model. The indoor ambient temperature and the indoor set temperature serve as the inputs to the neural network model, while the theoretical power value is the output. After obtaining the indoor ambient temperature and the indoor set temperature, inputting them into the neural network model yields the theoretical power value.

[0039] Step S300: Based on the judgment result, control the opening degree of the regulating valve.

[0040] The opening degree of the regulating valve is directly related to the amount of oil returned to the compressor. Specifically, a larger valve opening results in a larger oil return, and a smaller valve opening results in a smaller oil return. During actual compressor operation, the amount of oil returned affects the compressor's actual power output; a smaller oil return results in a smaller actual power output, and vice versa. The theoretical power output of this invention is directly related to the compressor's oil return, reflecting its optimal return rate. Therefore, by comparing the actual power output with the theoretical power output to control the valve opening, the compressor's oil return can be maintained within an optimal range.

[0041] Based on the judgment result, there are various possible implementation methods for controlling the opening degree of the regulating valve. The present invention will now describe two embodiments as examples.

[0042] Example 1:

[0043] The control method of the present invention further includes: after the air conditioning system is started, controlling the initial opening of the regulating valve to be equal to the initial opening of the throttle valve, so that the opening of the throttle valve can be used as a reference standard for adjusting the opening of the regulating valve. Possibly, the maximum opening of the regulating valve and the throttle valve is 480 pls, and the minimum opening is 200 pls. Under this premise, step S300 includes:

[0044] In the first scenario: when the theoretical power Twa is greater than the actual power Twb, if ΔTw1 ≥ Tw1, the opening of the control valve is greater than the opening of the throttle valve. If ΔTw1 < Tw1, the opening of the control valve remains equal to the opening of the throttle valve.

[0045] Wherein, ΔTw1=(Twa-Twb) / Twa*100%, and Tw1 is a preset percentage.

[0046] Possibly, the value of Tw1 can range from 3% to 7%, preferably 5%. That is, when ΔTw1 < Tw1, the air conditioning system considers this a normal fluctuation or calculation error, and no correction is made; the opening of the control valve continues to be equal to the opening of the throttle valve. When ΔTw1 ≥ Tw1, it indicates that the compressor's oil return is insufficient. In this case, the opening of the control valve is greater than the opening of the throttle valve, thereby increasing the compressor's oil return and keeping the compressor's oil level within the optimal range, thus preventing internal wear of the compressor.

[0047] Possibly, the step of "if ΔTw1 ≥ Tw1, control the opening degree of the regulating valve to be greater than the opening degree of the throttle valve" further includes:

[0048] When Tw2>ΔTw1≥Tw1, the opening degree of the control regulating valve is equal to the sum of the opening degree of the throttle valve of the air conditioning system and the first preset opening degree;

[0049] When Tw3>ΔTw1≥Tw2, the opening degree of the control regulating valve is equal to the sum of the opening degree of the throttle valve of the air conditioning system and the second preset opening degree;

[0050] When ΔTw1≥Tw3, the opening degree of the control regulating valve is equal to the sum of the opening degree of the throttle valve of the air conditioning system and the third preset opening degree.

[0051] Among them, the third preset opening is greater than the second preset opening, which is greater than the first preset opening. Tw2 and Tw3 are both preset percentage values, i.e., Tw3 > Tw2 > Tw1.

[0052] Possibly, the third preset opening value ranges from 13pls to 17pls, preferably 15pls; the second preset opening value ranges from 8pls to 12pls, preferably 10pls; and the first preset opening value ranges from 3pls to 7pls, preferably 5pls. The value of Tw2 ranges from 8% to 12%, preferably 10%; and the value of Tw3 ranges from 13% to 17%, preferably 15%. For ease of explanation, the opening of the regulating valve is denoted as levb, and the opening of the throttle valve is denoted as leva. Possibly, when 10% > ΔTw1 ≥ 5%, levb = leva + 5pls; when 15% > ΔTw1 ≥ 10%, levb = leva + 10pls; and when ΔTw1 ≥ 15%, levb = leva + 15pls.

[0053] The above control method can precisely regulate the regulating valve, thereby precisely regulating the oil return of the compressor, keeping the oil return of the compressor within the optimal oil return range, thus avoiding internal wear of the compressor due to insufficient oil.

[0054] The second scenario: When the theoretical power Twa is less than the actual power Twb, if ΔTw2 ≥ Tw1, the opening of the control valve is less than the opening of the throttle valve. If ΔTw2 < Tw1, the opening of the control valve remains equal to the opening of the throttle valve.

[0055] Wherein, ΔTw2=(Twb-Twa) / Twa*100%. Tw1 can be the Tw1 value in step S401.

[0056] In other words, when ΔTw2 < Tw1, the air conditioning system is judged as experiencing normal fluctuations or calculation errors, and no correction is made; the opening of the control valve continues to be equal to the opening of the throttle valve. When ΔTw2 ≥ Tw1, it indicates that the amount of oil returning to the compressor is excessive. In this case, the opening of the control valve is less than the opening of the throttle valve, thereby reducing the amount of oil returning to the compressor and preventing an increase in compressor power.

[0057] Possibly, the step of "if ΔTw2 ≥ Tw1, control the opening of the regulating valve to be less than the opening of the throttle valve" further includes:

[0058] When Tw2>ΔTw2≥Tw1, the opening degree of the control regulating valve is equal to the difference between the opening degree of the throttle valve of the air conditioning system and the first preset opening degree.

[0059] When Tw3>ΔTw2≥Tw2, the opening degree of the control regulating valve is equal to the difference between the opening degree of the throttle valve of the air conditioning system and the second preset opening degree.

[0060] When ΔTw2≥Tw3, the opening degree of the control valve is equal to the difference between the opening degree of the throttle valve of the air conditioning system and the third preset opening degree.

[0061] Among them, the third preset opening is greater than the second preset opening, which is greater than the first preset opening. Tw2 and Tw3 are both preset percentage values, i.e., Tw3 > Tw2 > Tw1.

[0062] Possibly, the third preset opening value ranges from 13pls to 17pls, preferably 15pls; the second preset opening value ranges from 8pls to 12pls, preferably 10pls; and the first preset opening value ranges from 3pls to 7pls, preferably 5pls. The value of Tw2 ranges from 8% to 12%, preferably 10%; and the value of Tw3 ranges from 13% to 17%, preferably 15%. For ease of explanation, the opening of the regulating valve is denoted as levb, and the opening of the throttle valve is denoted as leva. Possibly, when 10% > ΔTw1 ≥ 5%, levb = leva - 5pls; when 15% > ΔTw1 ≥ 10%, levb = leva - 10pls; and when ΔTw1 ≥ 15%, levb = leva - 15pls.

[0063] The above control method can precisely regulate the regulating valve, thereby precisely regulating the oil return of the compressor, keeping the oil return of the compressor within the optimal oil return range, thus avoiding the increase in compressor power due to excessive oil in the compressor.

[0064] The third scenario: When Twa = Twb, the opening degree of the control valve continues to be equal to the opening degree of the throttle valve.

[0065] When Twa = Twb, it indicates that the compressor oil level is within the optimal range. At this point, the opening of the control valve remains equal to the opening of the throttle valve. Since the throttle valve opening remains stable during system operation, the control valve opening is consistent with the throttle valve opening, and the control valve opening also remains unchanged. However, when the throttle valve is fine-tuned (usually by 1-5 pls), the refrigerant flow in the air conditioning system changes. The refrigerant mixes with the oil in the compressor and is then discharged from the compressor. At this point, the opening of the control valve needs to be adjusted to balance the amount of oil entering the compressor.

[0066] Example 2:

[0067] Step S300 includes: Embodiments 1 to 5 described below, in which ΔTw3 = Twb - Twa; K is the initial opening degree of the regulating valve.

[0068] Implementation method 1: When ΔTw3 > Twa, control the opening degree of the regulating valve to be KTwa / ΔTw3.

[0069] In other words, when Twb > 2Twa, it indicates that the actual power is too high and there is too much oil in the compressor. At this time, the opening of the regulating valve is controlled at KTwa / ΔTw3, which can precisely reduce the opening of the regulating valve. For example, when Twb = 3Twa, the opening of the regulating valve is 0.5K; when Twb = 5Twa, the opening of the regulating valve is 0.25K. That is, the higher the actual power, the more regularly the opening of the regulating valve of this invention can decrease, thereby reducing the amount of oil returning to the compressor and keeping the amount of oil in the compressor within the optimal range, thus avoiding a significant increase in the compressor power.

[0070] Implementation Method 2: When ΔTw3=Twa, the opening degree of the control valve is: the initial opening degree of the control valve minus the fourth preset opening degree value.

[0071] That is, when Twb=2Twa, the opening of the control valve is reduced by a fourth preset opening value, the value of which is in the range of 4-6pls, preferably 5pls; the value of the initial opening is in the range of 200-480pls.

[0072] Implementation method 3: When 0 < ΔTw3 < Twa, the opening degree of the control valve is controlled to be KΔTw3 / Twa.

[0073] That is, when 2Twa>Twb>Twa, it proves that the actual power is already large and the amount of oil in the compressor is large. At this time, the opening of the control valve is KΔTw3 / Twa, which can reduce the opening of the control valve, thereby reducing the amount of oil returning to the compressor and keeping the amount of oil in the compressor within a reasonable range.

[0074] Implementation method 4: When ΔTw3 < 0, control the opening degree of the regulating valve to be K(-ΔTw / Twa+1).

[0075] When Twb < Twa, it is proven that the actual power is less than the theoretical power and the amount of oil returning to the compressor is less. At this time, based on theoretical research, the opening degree of the control valve is controlled by K(-ΔTw / Twa+1), which can accurately control the opening degree of the control valve and increase the opening degree of the control valve precisely, thereby accurately increasing the amount of oil returning to the compressor and avoiding internal wear of the compressor.

[0076] Implementation Method 5: When ΔTw3=0, the opening of the control valve remains unchanged.

[0077] In this case, the actual power of the compressor is equal to the theoretical power. By keeping the opening of the control valve unchanged, the optimal oil return rate of the compressor can be achieved.

[0078] Possibly, such as Figure 3 As shown, the control method of the air conditioning system of the present invention includes the following steps:

[0079] Step S401: After the air conditioning system is started, obtain the actual operating parameter value Twb of the compressor.

[0080] Step S402: Obtain the indoor ambient temperature.

[0081] Step S403: Obtain the indoor set temperature.

[0082] Step S404: Determine the theoretical power value of the compressor based on the indoor ambient temperature and the indoor set temperature.

[0083] Step S405: Determine the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor.

[0084] Step S406: Based on the judgment result, control the opening degree of the regulating valve.

[0085] In another aspect, the present invention also provides an air conditioning system including a memory and a processor, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the air conditioning system described in any of the above embodiments.

[0086] Those skilled in the art will understand that the above-described air conditioning system also includes other well-known structures, such as processors, controllers, and memories. These memories include, but are not limited to, random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), volatile memory, non-volatile memory, serial memory, parallel memory, or registers. Processors include, but are not limited to, CPLD / FPGA, DSP, ARM processors, and MIPS processors. To avoid unnecessarily obscuring the embodiments of this disclosure, these well-known structures are not shown in the accompanying drawings.

[0087] Although the steps in the above embodiments are described in the above order, those skilled in the art will understand that, in order to achieve the effect of this embodiment, different steps do not necessarily need to be executed in such an order. They can be executed simultaneously (in parallel) or in reverse order. For example, steps S401 to S403 can be executed simultaneously or in reverse order, and steps S501 to S405 can be executed simultaneously or in reverse order. These simple variations are all within the protection scope of this invention.

[0088] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for an air conditioning system, the air conditioning system comprising a compressor, a gas-liquid separator, and an oil return pipeline connecting the compressor and the gas-liquid separator, characterized in that, The return oil line is equipped with a regulating valve, and the control method includes: after the air conditioning system is started, obtaining the actual operating parameter value Twb of the compressor; Determine the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor; Based on the judgment result, the opening degree of the regulating valve is controlled; The step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: When Twa > Twb and ∆Tw1 ≥ Tw1, the opening degree of the regulating valve is controlled to be greater than the opening degree of the throttle valve of the air conditioning system; and / or When Twa < Twb and ∆Tw2 ≥ Tw1, the opening degree of the regulating valve is controlled to be less than the opening degree of the throttle valve of the air conditioning system; Where ∆Tw1=(Twa-Twb) / Twa*100%, ∆Tw2=(Twb-Twa) / Twa*100%, and Tw1 is a preset percentage.

2. The control method for the air conditioning system according to claim 1, characterized in that, The operating parameter value is the power value.

3. The control method for the air conditioning system according to claim 1, characterized in that, The control method further includes: After the air conditioning system is started, the initial opening of the regulating valve is equal to the initial opening of the throttle valve of the air conditioning system.

4. The control method for the air conditioning system according to claim 3, characterized in that, The step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: When Twa=Twb, the opening degree of the regulating valve continues to be equal to the opening degree of the throttle valve.

5. The control method for an air conditioning system according to claim 3, characterized in that, The step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: When ∆Tw1<Tw1, the opening degree of the regulating valve continues to be equal to the opening degree of the throttle valve.

6. The control method for the air conditioning system according to claim 3, characterized in that, The step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: When ∆Tw2<Tw1, the opening degree of the regulating valve continues to be equal to the opening degree of the throttle valve.

7. The control method for an air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a temperature sensor for detecting the indoor ambient temperature. Before the step of "determining the relationship between the actual operating parameter value Twb and the theoretical operating parameter value Twa of the compressor", the control method further includes: Obtain indoor ambient temperature; Get the indoor set temperature; Based on the indoor ambient temperature and the indoor set temperature, the theoretical operating parameter values ​​of the compressor are determined.

8. The control method for an air conditioning system according to claim 1, characterized in that, The step of "controlling the opening degree of the regulating valve based on the judgment result" further includes: When ∆Tw3>Twa, the opening degree of the regulating valve is controlled to be KTwa / ∆Tw3; and / or When 0 < ∆Tw3 < Twa, the opening degree of the regulating valve is controlled to be K∆Tw3 / Twa; and / or When ∆Tw3 < 0, the opening degree of the regulating valve is controlled to be K(-∆Tw3 / Twa+1); and / or When ∆Tw3=Twa, the opening degree of the regulating valve is controlled as: the initial opening degree of the regulating valve minus the fourth preset opening degree value; Wherein, ∆Tw3=Twb-Twa; K is the initial opening degree of the regulating valve; the value range of the fourth preset opening degree is 4-6pls; the value range of the initial opening degree is 200-480pls.

9. An air conditioning system characterized by, The air conditioning system includes a compressor, a gas-liquid separator, and an oil return line connecting the compressor and the gas-liquid separator. A regulating valve is provided on the oil return line. The air conditioning system also includes a memory and a processor. The memory is adapted to store multiple program codes, which are adapted to be loaded and run by the processor to perform the control method of the air conditioning system according to any one of claims 1-8.

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