Heat pump machine and valve opening control method, controller and medium thereof

Abstract

The present application discloses a heat pump and its valve opening control method, controller, and medium. The method corrects the preset target superheat of the main circuit by the real-time superheat of the auxiliary circuit, and determines whether the corrected target superheat is the same as the real-time superheat of the main circuit; if the corrected target superheat is different from the real-time superheat of the main circuit, the main valve opening is adjusted according to the corrected target superheat; if the corrected target superheat is the same as the real-time superheat of the main circuit, it is determined whether the real-time superheat of the auxiliary circuit has stabilized. The above method can continuously use the real-time superheat of the auxiliary circuit to correct the target superheat of the main circuit, obtain the corrected target superheat, adjust the main valve according to the corrected target superheat, and continuously dynamically adjust the corrected target superheat according to the real-time superheat of the auxiliary circuit, gradually weaken the compensation effect of the main valve, avoid over-adjustment of the main valve, put the heat pump in a better operating state, and avoid safety accidents caused by excessive exhaust temperature of the compressor.

Description

Technical Field

[0001] The present application relates to the technical field of heat pumps, and in particular to a heat pump and a valve opening control method, a controller, and a medium thereof. Background Art

[0002] The valve opening control of the traditional heat pump controls the opening of the main valve by comparing the return air superheat of the main circuit with the target superheat of the main circuit, and controls the opening of the auxiliary valve by comparing the return air superheat of the auxiliary circuit with the target superheat of the auxiliary circuit, combined with the exhaust temperature of the heat pump. As mentioned above, controlling the opening of the main valve and the auxiliary valve by a single target superheat cannot put the heat pump in the best state. For example, when the ambient temperature of the system or the temperature of the medium to be heated changes, the heat exchange capacity and energy efficiency ratio of the heat pump will vary greatly, and may even cause the compressor exhaust temperature to be too high, resulting in a safety accident. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a heat pump machine and its valve opening control method, controller, and medium, which can maintain the heat pump machine's optimal heat exchange and energy efficiency ratio under different ambient temperatures, and avoid the compressor exhaust temperature being too high, causing safety hazards.

[0004] In order to solve the above problems, the first aspect of the present application provides a valve opening control method for a heat pump machine, the control method comprising: controlling the opening of the main valve so that the real-time superheat of the main circuit is close to the preset target superheat of the main circuit; obtaining the real-time superheat of the auxiliary circuit, and correcting the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat; judging whether the corrected target superheat is the same as the real-time superheat of the main circuit; if the corrected target superheat is different from the real-time superheat of the main circuit, adjusting the real-time superheat of the main circuit according to the real-time superheat of the main circuit and the corrected target superheat. The opening of the main valve; executing the step of obtaining the real-time superheat of the auxiliary road, and correcting the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain a corrected target superheat; if the corrected target superheat is the same as the real-time superheat of the main road, judging whether the real-time superheat of the auxiliary road has stabilized, and if the real-time superheat of the auxiliary road has stabilized, completing the valve adjustment; if the real-time superheat of the auxiliary road is not stable; executing the step of obtaining the real-time superheat of the auxiliary road, and correcting the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain a corrected target superheat.

[0005] In a possible implementation, the step of obtaining the real-time superheat of the auxiliary road and correcting the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the corrected target superheat specifically includes: obtaining the real-time superheat of the auxiliary road and an auxiliary valve coefficient; wherein the corrected target superheat is calculated as follows: corrected target superheat = preset target superheat + real-time superheat of the auxiliary road ÷ auxiliary valve coefficient.

[0006] In a possible implementation, the step of adjusting the opening of the main valve according to the real-time superheat of the main circuit and the corrected target superheat specifically includes: judging the magnitude of the real-time superheat of the main circuit and the corrected target superheat; if the real-time superheat of the main circuit is greater than the corrected target superheat, increasing the opening of the main valve; if the real-time superheat of the main circuit is less than the corrected target superheat, reducing the opening of the main valve.

[0007] In one possible implementation, if the real-time superheat of the main circuit is greater than the corrected target superheat, the valve-adding compensation value of the main valve is calculated, and the opening of the main valve is controlled to increase the valve-adding compensation value; wherein, the calculation formula of the valve-adding compensation value is: valve-adding compensation value = valve-adding coefficient * (real-time superheat of the main circuit - corrected target superheat); if the real-time superheat of the main circuit is less than the corrected target superheat, the valve-reducing compensation value of the main valve is calculated, and the opening of the main valve is controlled to reduce the valve-reducing compensation value; wherein, the calculation formula of the valve-reducing compensation value is: valve-reducing compensation value = valve-reducing coefficient * (real-time superheat of the main circuit - corrected target superheat).

[0008] In a possible implementation, the return air temperature of the compressor and the outer disk temperature of the evaporator are obtained, and the difference between the outer disk temperature of the evaporator and the return air temperature of the compressor is calculated to obtain the real-time superheat of the main circuit; the auxiliary circuit of the heat pump is provided with an economizer, and the inlet temperature and outlet temperature of the auxiliary circuit in the economizer are obtained, and the difference between the inlet temperature and the outlet temperature is calculated to obtain the real-time superheat of the auxiliary circuit.

[0009] To solve the above problems, the second aspect of the present application provides a controller, which is applied to a heat pump machine including a main circuit and an auxiliary circuit, wherein the main circuit is provided with a main valve, and the auxiliary circuit is provided with an auxiliary valve, wherein the controller controls the opening of the main valve through the above control method, and the controller comprises: an acquisition module, wherein the acquisition module is used to acquire the real-time superheat of the main circuit and the real-time superheat of the auxiliary circuit; a correction module, wherein the correction module is connected to the acquisition module, wherein the correction module is used to correct the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat; and a judgment module, wherein the judgment module is connected to the correction module, wherein the judgment module is used to judge whether the corrected target superheat is equal to the real-time superheat of the main circuit. whether the superheat is the same when the correction target superheat is the same; a main valve control module, the main valve control module is connected to the main valve, the main valve control module is also connected to the correction module and the judgment module, the main valve control module is used to control the opening of the main valve; the main valve control module also adjusts the opening of the main valve according to the real-time superheat of the main road and the corrected target superheat when the judgment module judges that the corrected target superheat is different from the real-time superheat of the main road; the judgment module also judges whether the real-time superheat of the auxiliary road has stabilized when the corrected target superheat is the same as the real-time superheat of the main road, and if the real-time superheat of the auxiliary road has stabilized, the main valve control module completes the valve adjustment.

[0010] In a possible implementation, the acquisition module acquires the real-time superheat of the auxiliary road, and the correction module corrects the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the corrected target superheat step, specifically including: acquiring the real-time superheat of the auxiliary road and the auxiliary valve coefficient; wherein the calculation method of the corrected target superheat is: corrected target superheat = preset target superheat + real-time superheat of the auxiliary road ÷ auxiliary valve coefficient.

[0011] In a possible implementation, the main valve control module adjusts the opening of the main valve according to the real-time superheat of the main circuit and the corrected target superheat, specifically comprising: judging the magnitude of the real-time superheat of the main circuit and the corrected target superheat; if the real-time superheat of the main circuit is greater than the corrected target superheat, increasing the opening of the main valve; if the real-time superheat of the main circuit is less than the corrected target superheat, reducing the opening of the main valve.

[0012] In one possible implementation, if the real-time superheat of the main circuit is greater than the corrected target superheat, the main valve control module calculates the valve-adding compensation value of the main valve, and controls the opening of the main valve to increase the valve-adding compensation value; wherein, the calculation formula of the valve-adding compensation value is: valve-adding compensation value = valve-adding coefficient * (real-time superheat of the main circuit - corrected target superheat); if the real-time superheat of the main circuit is less than the corrected target superheat, the main valve control module calculates the valve-reducing compensation value of the main valve, and controls the opening of the main valve to reduce the valve-reducing compensation value; wherein, the calculation formula of the valve-reducing compensation value is: valve-reducing compensation value = valve-reducing coefficient * (real-time superheat of the main circuit - corrected target superheat).

[0013] In a possible implementation, the acquisition module acquires the return air temperature of the compressor and the outer disk temperature of the evaporator, and calculates the difference between the outer disk temperature of the evaporator and the return air temperature of the compressor to obtain the real-time superheat of the main circuit; the auxiliary circuit of the heat pump machine is provided with an economizer, and the acquisition module acquires the inlet temperature and outlet temperature of the auxiliary circuit in the economizer, and calculates the difference between the inlet temperature and the outlet temperature to obtain the real-time superheat of the auxiliary circuit.

[0014] To solve the above problem, the third aspect of the present application provides a controller, including a processor and a memory connected to each other; wherein the memory stores program instructions, and the processor calls the program instructions from the memory to execute the opening control method of the first aspect.

[0015] To solve the above problems, the fourth aspect of the present application provides a heat pump machine, which includes an evaporator, a compressor, a condenser, an economizer and a controller; the first end of the condenser is connected to the first end of the evaporator through a main road; the second end of the evaporator is connected to the return air end of the compressor; the first end of the condenser is also connected to the return air end of the compressor through an auxiliary road; the exhaust end of the compressor is connected to the second end of the condenser; the main road is provided with a main valve, and the auxiliary road is provided with an auxiliary valve; the main road and the auxiliary road both pass through the economizer; the controller is connected to the main valve, and the controller is the controller described in the second aspect or the third aspect.

[0016] To solve the above-mentioned problem, the fifth aspect of the present application provides a computer-readable storage medium on which program instructions are stored. When the program instructions are executed by a processor, the opening control method of the first aspect is implemented.

[0017] The beneficial effects of the present invention are as follows: different from the prior art, in the valve opening control method of the heat pump machine of the present application, by controlling the opening of the main valve, the real-time superheat of the main circuit is made close to the preset target superheat of the main circuit; the real-time superheat of the auxiliary circuit is obtained, and the preset target superheat of the main circuit is corrected based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat; it is judged whether the corrected target superheat is the same as the real-time superheat of the main circuit; if the corrected target superheat is different from the real-time superheat of the main circuit, the corrected target superheat is corrected according to the real-time superheat of the main circuit and the corrected target superheat. Adjust the opening of the main valve; execute the steps of obtaining the real-time superheat of the auxiliary road, and correcting the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the corrected target superheat; if the corrected target superheat is the same as the real-time superheat of the main road, determine whether the real-time superheat of the auxiliary road has stabilized, and if the real-time superheat of the auxiliary road has stabilized, complete the valve adjustment; if the real-time superheat of the auxiliary road is not stable; execute the steps of obtaining the real-time superheat of the auxiliary road, and correcting the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the corrected target superheat. The above-mentioned present application can continuously use the real-time superheat of the auxiliary road to correct the target superheat of the main road to obtain the corrected target superheat, adjust the main valve according to the corrected target superheat, and continuously dynamically adjust the corrected target superheat according to the real-time superheat of the auxiliary road, gradually weaken the compensation effect of the main valve, avoid over-adjustment of the main valve, put the heat pump machine in a better operating state, and avoid safety accidents caused by excessive exhaust temperature of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the first embodiment of the valve opening control method of the heat pump machine of the present application;

[0019] Figure 2 It is a flow chart of a second embodiment of the valve opening control method of the heat pump machine of the present application;

[0020] Figure 3 yes Figure 2 A schematic diagram of a process flow of an implementation method of S212;

[0021] Figure 4 It is a schematic diagram of the framework structure of an embodiment of a controller of the present application;

[0022] Figure 5 It is a schematic diagram of the framework structure of another embodiment of the controller of the present application;

[0023] Figure 6 This is a schematic diagram of the framework structure of an embodiment of the heat pump machine;

[0024] Figure 7 It is a structural diagram of an embodiment of a computer-readable storage medium of the present application. DETAILED DESCRIPTION

[0025] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0026] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0027] The terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship. In addition, "many" in this article means two or more than two.

[0028] See also Figure 1 , Figure 1 1 is a flow chart of the first embodiment of the valve opening control method of the heat pump machine of the present application. Figure 6 , Figure 6 Schematic diagram of the framework structure of an embodiment of the heat pump machine of the present application. The heat pump machine 60 includes an evaporator 62 , a compressor 63 , a condenser 64 and an economizer 65 .

[0029] The heat pump machine 60 includes a main path 66 and an auxiliary path 67. The first end of the condenser 64 is connected to the first end of the evaporator 62 through the main path 66; the second end of the evaporator 62 is connected to the return air end of the compressor 63; the first end of the condenser 64 is also connected to the return air end of the compressor 63 through the auxiliary path 67; the exhaust end of the compressor 63 is connected to the second end of the condenser 64; the main path 66 is provided with a main valve 611, and the auxiliary path 67 is provided with an auxiliary valve 612; the main path 66 and the auxiliary path 67 both pass through the economizer 65. In this embodiment, the compressor 63 includes a first return air end (not marked in the figure) and a second return air end (not marked in the figure), the second end of the evaporator 62 is connected to the second return air end of the compressor 63, and the first end of the condenser 64 is also connected to the second return air end of the compressor 63 through the auxiliary path 67. The economizer 65 includes a first channel (not marked in the figure) and a second channel (not marked in the figure), the main path 66 passes through the first channel, and the auxiliary path 67 passes through the second channel.

[0030] Among them, the evaporator 62 is used to exchange heat between the refrigerant and the outdoor air, so that the refrigerant receives the heat of the outdoor air and then vaporizes. In this embodiment, the evaporator 62 is specifically a heat exchange tube, and a fan (not marked in the figure) is provided corresponding to the heat exchange tube. The fan blows the outdoor air through the heat exchange tube to improve the heat exchange efficiency between the air and the refrigerant. In some preferred embodiments, the surface of the heat exchange tube is also covered with fins to further improve the heat exchange efficiency. In this embodiment, the condenser 64 is a heat exchange plate, and the heat exchange plate is provided with a liquid inlet and a liquid outlet. When the high-temperature and high-pressure refrigerant passes through the heat exchange plate, it exchanges heat with the liquid flowing in the heat exchange plate to heat the liquid. In this embodiment, the heat pump 60 is used to heat the liquid by the heat of the outdoor air. In some other embodiments, the heat pump 60 can also be used to heat the indoor gas.

[0031] During operation, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust end of the compressor 63 enters the condenser 64, and the high-temperature and high-pressure gaseous refrigerant exchanges heat with the liquid flowing in the condenser 64 to heat the liquid. The refrigerant part after heat exchange and temperature reduction enters the evaporator 62 through the main valve 611 on the main path 66 to exchange heat with the outdoor air, and vaporizes after heating again, and returns to the compressor 63 through the return air end of the compressor 63. In addition, the other part of the refrigerant after heat exchange and temperature reduction directly returns to the compressor 63 through the auxiliary valve 612 on the auxiliary path 67. The control of the amount of refrigerant on the auxiliary path 67 can play the role of replenishing air and increasing enthalpy on the main path 66, so as to increase the heat exchange capacity of the heat pump machine 60. In addition, both the main path 66 and the auxiliary path 67 pass through the economizer 65, and the economizer 65 transfers part of the heat of the refrigerant on the main path 66 to the refrigerant on the auxiliary path 67, so as to further reduce the heat of the refrigerant on the main path 66, so as to increase the heat exchange capacity, and preheat the refrigerant on the auxiliary path 67.

[0032] The heat pump machine 60 in the embodiment of the present application further includes a controller (not shown), which is connected to the main valve 611 . The execution body of the valve opening control method of the heat pump machine 60 in the present embodiment is the controller.

[0033] In one embodiment of the valve opening control method of the heat pump machine of the present application, the control method may include the following steps:

[0034] S111: Control the opening of the main valve so that the real-time superheat of the main valve is equal to the preset target superheat of the main line.

[0035] After the refrigerant passes through the evaporator, the temperature of the refrigerant returning to the compressor is the return air temperature. The difference between the return air temperature and the temperature of the refrigerant before passing through the evaporator is the superheat of the main circuit. The temperature of the refrigerant before passing through the evaporator can be obtained by measuring the temperature of the external disk at the inlet of the evaporator. Among them, the preset target superheat of the main circuit is the ideal superheat of the heat pump machine for efficient and stable operation of the heat pump machine under ideal conditions. When the heat pump machine is started, the main valve of the heat pump machine is first controlled to make the real-time superheat of the main circuit close to the preset target superheat of the main circuit.

[0036] In this embodiment, the outdoor air temperature is not too low, the opening of the main valve is adjusted to a certain appropriate opening, the flow rate of the refrigerant in the main circuit reaches an appropriate value, part of the refrigerant flows into the main circuit, and the other part of the refrigerant flows into the auxiliary circuit. The real-time superheat of the main circuit can be equal to the preset target superheat of the main circuit. In this embodiment, the heat pump is in a cut-off state, and there is refrigerant in the auxiliary circuit, which can play a role in replenishing air and increasing enthalpy.

[0037] S112: Acquire the real-time superheat of the auxiliary circuit, and correct the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat.

[0038] The auxiliary line passes through the economizer, wherein the difference between the temperature of the auxiliary line at the outlet of the economizer and the temperature of the auxiliary line at the inlet of the economizer is the superheat of the auxiliary line.

[0039] This step is performed after the real-time superheat of the main path is brought close to the preset target superheat of the main path.

[0040] After the previous step, the real-time superheat of the main road is equal to the preset target superheat of the main road, and there is refrigerant in the auxiliary road. The control of the amount of refrigerant in the auxiliary road can play a role in replenishing air and increasing enthalpy in the main road, and the heat pump is in a cut-off state. The heat exchange capacity of the heat pump is appropriate, the temperature of the compressor exhaust port is appropriate, and there is no risk of safety accidents in the heat pump. In addition, the refrigerant passes through the economizer in the auxiliary road, and the preheating effect of the economizer is limited. The temperature of the auxiliary road at the inlet and outlet of the economizer is close. In this embodiment, the real-time superheat of the auxiliary road is close to 0, wherein the greater the real-time superheat of the auxiliary road, the greater the correction effect on the preset target superheat of the main road. In this embodiment, the preset target superheat of the main road is corrected by the real-time superheat of the auxiliary road, and the corrected target superheat is nearly equal to the preset target superheat of the main road.

[0041] S113: The corrected target superheat is the same as the real-time superheat of the main line, and the real-time superheat of the auxiliary line has stabilized, and the valve adjustment is completed.

[0042] The corrected target superheat obtained in the previous step is the same as the preset target superheat. Since the real-time superheat of the main circuit is equal to the preset target superheat after S111, the real-time superheat of the current main circuit is equal to the corrected target superheat. The heat pump is in the cut-off state, the refrigerant continues to flow in the auxiliary circuit, the real-time superheat of the auxiliary circuit is close to 0, the real-time superheat of the auxiliary circuit is equal to the preset target superheat of the auxiliary circuit, and the real-time superheat of the auxiliary circuit is stable, then the heat pump completes the valve adjustment.

[0043] In the above steps, by controlling the main valve, the real-time superheat of the main circuit is equal to the preset target superheat of the main circuit, and there is refrigerant in the auxiliary circuit, and the heat pump is in a cut-off state. The auxiliary circuit can play the role of replenishing air and increasing enthalpy, avoiding the compressor's exhaust temperature from being too high, and the heat pump can achieve a better working state.

[0044] See also Figure 2 , Figure 2 1 is a flow chart of the second embodiment of the valve opening control method of the heat pump machine of the present application. In the second embodiment of the valve opening control method of the heat pump machine of the present application, the control method may include the following steps:

[0045] S211: Control the main valve opening so that the real-time superheat of the main valve is close to the preset target superheat of the main line.

[0046] In the scenario of the second embodiment, the outdoor air temperature is too low, resulting in very little heat exchange obtained by the evaporator in the outdoor environment, so the refrigerant cannot fully absorb heat in the evaporator, and the temperature of the refrigerant is low when it enters the compressor, and the real-time superheat of the main circuit is small. In addition, since the temperature of the refrigerant entering the compressor is low, part of the refrigerant that has not fully exchanged heat enters the compressor in a liquid state, and the compressor can compress less gaseous refrigerant, the exhaust temperature of the compressor will be high, and the operation state of the heat pump is not good. In order to increase the heat exchange of the refrigerant in the evaporator, increase the air supply, and reduce the exhaust temperature, it is necessary to gradually adjust the opening of the main valve to reduce the temperature so that the main circuit refrigerant and the outdoor air temperature have a reasonable temperature difference and exchange heat through the evaporator. During the process of reducing the opening of the main valve, the real-time superheat of the main circuit becomes larger and approaches the preset target superheat of the main circuit. Among them, the real-time superheat may be close to the preset target superheat, that is, when the main valve is closed, the real-time superheat is still less than the preset target superheat. The real-time superheat may also be equal to the preset target superheat. This is different from the first embodiment. In the first embodiment, when the real-time superheat of the main circuit is equal to the preset target superheat, there is refrigerant in both the main circuit and the auxiliary circuit, and the auxiliary circuit can normally perform air replenishment and enthalpy increase. In this embodiment, after the real-time superheat of the main circuit is close to the preset target superheat, there is no refrigerant flow in the auxiliary circuit, or there is little refrigerant, and the auxiliary circuit cannot normally perform air replenishment and enthalpy increase. Or the auxiliary circuit has little air replenishment, and the real-time superheat of the auxiliary circuit is still very large.

[0047] S212: Acquire the real-time superheat of the auxiliary circuit, and correct the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat.

[0048] The auxiliary line passes through the economizer, wherein the difference between the temperature of the auxiliary line at the outlet of the economizer and the temperature of the auxiliary line at the inlet of the economizer is the superheat of the auxiliary line.

[0049] This step is performed after the opening of the main valve is controlled so that the real-time superheat of the main path is closest to the preset target superheat of the main path.

[0050] In this embodiment, the outdoor air temperature is low, and the refrigerant cannot fully absorb heat in the compressor. After the main valve is adjusted, all the refrigerant enters the main circuit, and there is basically no refrigerant in the auxiliary circuit. The auxiliary circuit can no longer play the role of replenishing air and increasing enthalpy, and the heat pump is not in a cut-off state. In this state, the exhaust temperature of the compressor is likely to be too high, causing a safety accident. In addition, there is basically no refrigerant in the auxiliary circuit. Since the auxiliary circuit is closer to the compressor at the economizer outlet, when there is no refrigerant in the auxiliary circuit, it is affected by the temperature of the compressor, and the temperature of the auxiliary circuit at the economizer outlet is greater than the temperature of the auxiliary circuit at the economizer inlet. In this case, the real-time superheat of the auxiliary circuit is greater than 0. Please refer to Figure 3 , Figure 3 yes Figure 2 In the flowchart of an implementation of S212, in some implementations, S212 may include:

[0051] S121: Obtaining the real-time superheat and auxiliary valve coefficient of the auxiliary circuit.

[0052] S122: Calculate the corrected target superheat using a calculation formula.

[0053] In this embodiment, the inlet temperature and outlet temperature of the auxiliary circuit in the economizer can be obtained, and the difference between the inlet temperature and the outlet temperature can be calculated to obtain the real-time superheat of the auxiliary circuit. The auxiliary valve coefficient reflects the ability of the auxiliary valve to regulate the refrigerant flow rate. It is a constant and can be obtained by referring to the parameters of the heat pump. Among them, the calculation method of the modified target superheat is: modified target superheat = preset target superheat + real-time superheat of the auxiliary circuit ÷ auxiliary valve coefficient.

[0054] S213: Determine whether the corrected target superheat is the same as the real-time superheat of the main line.

[0055] If the corrected target superheat of the main route is the same as the real-time superheat of the main route, S2131 is executed. If the corrected target superheat of the main route is different from the real-time superheat of the main route, S214 is executed.

[0056] In this embodiment, if the real-time superheat of the auxiliary path is greater than 0, the corrected target superheat of the main path is greater than the real-time superheat of the main path. If the corrected target superheat is different from the real-time superheat of the main path, S214 is executed.

[0057] S214: adjusting the opening of the main valve according to the real-time superheat of the main line and the corrected target superheat.

[0058] The step of adjusting the opening of the main valve according to the real-time superheat of the main circuit and the corrected target superheat may specifically include: judging the magnitude of the real-time superheat of the main circuit and the corrected target superheat; if the real-time superheat of the main circuit is greater than the corrected target superheat, increasing the opening of the main valve; if the real-time superheat of the main circuit is less than the corrected target superheat, reducing the opening of the main valve.

[0059] In this embodiment, the corrected target superheat is obtained by the real-time superheat of the auxiliary circuit. The corrected target superheat is greater than the real-time superheat of the main circuit, so the opening of the main valve is reduced, and when the main valve is reduced to the point where the real-time superheat of the main circuit is the same as the current corrected target superheat, the adjustment of the main valve is suspended.

[0060] In some embodiments, if the real-time superheat of the main circuit is less than the corrected target superheat, the valve reduction compensation value of the main valve is calculated, and the opening of the main valve is controlled to reduce the valve reduction compensation value; wherein, the calculation formula of the valve reduction compensation value is: valve reduction compensation value = valve reduction coefficient * (real-time superheat of the main circuit - corrected target superheat). wherein, the valve reduction compensation value is the number of steps that the main valve needs to reduce, and the valve reduction coefficient is the parameter of the main valve of the heat pump machine.

[0061] Further, in this embodiment, if the real-time superheat of the main circuit is greater than the corrected target superheat, the opening of the main valve is increased; if the real-time superheat of the main circuit is less than the corrected target superheat, the opening of the main valve is reduced. In other embodiments, if the real-time superheat of the main circuit is greater than the corrected target superheat by more than the upper limit error, the opening of the main valve is increased; if the real-time superheat of the main circuit is less than the corrected target superheat by more than the lower limit error, the opening of the main valve is reduced. Then the valve reduction compensation calculation formula can be adjusted to: valve reduction compensation value = valve reduction coefficient * (real-time superheat of the main circuit - (corrected target superheat + lower limit error)).

[0062] After adjusting the main valve opening by correcting the target superheat so that the real-time superheat of the main line is equal to the corrected target superheat, perform the following steps again:

[0063] S212: Acquire the real-time superheat of the auxiliary circuit, and correct the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat.

[0064] In the above steps, the opening of the main valve is reduced. After the opening of the main valve is reduced, the real-time superheat of the main circuit increases, the refrigerant begins to enter the auxiliary circuit, and the heat pump is cut off. After the refrigerant begins to enter the auxiliary circuit, the real-time superheat of the auxiliary circuit changes, the real-time superheat of the auxiliary circuit gradually decreases, and the real-time superheat of the auxiliary circuit gradually approaches the target superheat of the auxiliary circuit. Among them, the target superheat of the auxiliary circuit is usually 0. Then the corrected target superheat of the main circuit obtained according to the real-time superheat of the auxiliary circuit also gradually decreases.

[0065] S213: Determine whether the corrected target superheat is the same as the real-time superheat of the main line.

[0066] If the corrected target superheat of the main route is the same as the real-time superheat of the main route, S2131 is executed. If the corrected target superheat of the main route is different from the real-time superheat of the main route, S214 is executed.

[0067] In the previous step, after the main valve of the main road is reduced, the real-time superheat of the main road increases. When the corrected target superheat of the main road is reduced to a certain moment, the real-time superheat of the main road is the same as the corrected target superheat of the main road, and S2131 is executed.

[0068] S2131: Determine whether the real-time superheat of the auxiliary road has stabilized.

[0069] If the real-time superheat of the auxiliary circuit is stable, S215 is executed. If the real-time superheat of the auxiliary circuit is not stable, S212 is executed.

[0070] After the main valve of the main circuit is closed, the refrigerant begins to flow into the auxiliary circuit. As the amount of refrigerant in the auxiliary circuit increases, the real-time superheat of the auxiliary circuit decreases, and the corrected target superheat of the main circuit decreases, while the real-time superheat of the main circuit increases. At a certain moment, the corrected target superheat of the main circuit is equal to the real-time superheat of the main circuit. At this moment, the amount of refrigerant in the auxiliary circuit continues to increase, and the real-time superheat of the auxiliary circuit is not stable, and S212 is executed.

[0071] S212: Acquire the real-time superheat of the auxiliary circuit, and correct the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat.

[0072] The real-time superheat of the auxiliary circuit continues to decrease, and the obtained corrected target superheat also decreases.

[0073] S213: Determine whether the corrected target superheat is the same as the real-time superheat of the main line.

[0074] If the corrected target superheat of the main route is the same as the real-time superheat of the main route, S2131 is executed. If the corrected target superheat of the main route is different from the real-time superheat of the main route, S214 is executed.

[0075] At a certain moment, if the corrected target superheat of the main circuit continues to decrease and becomes less than the real-time superheat of the main circuit, S214 is executed.

[0076] S214: adjusting the opening of the main valve according to the real-time superheat of the main line and the corrected target superheat.

[0077] Since the corrected target superheat of the main line is less than the real-time superheat of the main line, the opening of the main valve is increased.

[0078] In some embodiments, if the real-time superheat of the main circuit is greater than the corrected target superheat, the valve compensation value of the main valve is calculated, and the opening of the main valve is controlled to increase the valve compensation value; wherein, the calculation formula of the valve compensation value is: valve compensation value = valve coefficient * (real-time superheat of the main circuit - corrected target superheat). wherein, the valve compensation value is the number of steps that the main valve needs to increase, and the valve coefficient is the parameter of the main valve in the heat pump.

[0079] Further, in this embodiment, if the real-time superheat of the main circuit is greater than the corrected target superheat, the opening of the main valve is increased; if the real-time superheat of the main circuit is less than the corrected target superheat, the opening of the main valve is reduced. In other embodiments, if the real-time superheat of the main circuit is greater than the corrected target superheat by more than the upper limit error, the opening of the main valve is increased; if the real-time superheat of the main circuit is less than the corrected target superheat by more than the lower limit error, the opening of the main valve is reduced. Then the valve compensation calculation formula can be adjusted to: valve compensation value = valve coefficient * (real-time superheat of the main circuit - (corrected target superheat + upper limit error)).

[0080] As mentioned above, S212 is executed again, and the real-time superheat of the auxiliary road is continuously used to correct the target superheat of the main road to obtain the corrected target superheat. The main valve is adjusted according to the corrected target superheat, and the corrected target superheat is continuously and dynamically adjusted according to the real-time superheat of the auxiliary road. The compensation effect of the main valve is gradually weakened, which can avoid the over-adjustment of the main valve, put the heat pump in a better operating state, and avoid safety accidents caused by excessive exhaust temperature of the compressor. When the real-time superheat of the main road is equal to the corrected target superheat of the main road and the real-time superheat of the auxiliary road is stable, the valve adjustment is completed and S215 is executed.

[0081] S215: Valve adjustment is completed.

[0082] In a specific application scenario, the preset target superheat of the main circuit of the heat pump is 1, and the main valve opening is controlled so that the real-time superheat of the main valve is equal to the preset target superheat of the main circuit.

[0083] In this application scenario, through the adjustment of the main valve, the real-time superheat of the main circuit is 1, and all the refrigerant enters the main circuit, and there is no refrigerant in the auxiliary circuit. In this case, the real-time superheat of the auxiliary circuit is larger, the real-time superheat of the auxiliary circuit is 40, the target superheat of the auxiliary circuit is 0, the auxiliary valve coefficient is 15, and the increase valve coefficient and the decrease valve coefficient of the main valve are both 1.

[0084] The preset target superheat of the main road is corrected by the real-time superheat of the auxiliary road. The corrected target superheat = preset target superheat + real-time superheat of the auxiliary road ÷ auxiliary valve coefficient = 1 + 40 ÷ 15. If the corrected target superheat is different from the real-time superheat of the main road, and the real-time superheat of the main road 1 is less than the corrected target superheat 4, the main valve is adjusted, and the valve reduction compensation value = valve reduction coefficient * (real-time superheat of the main road - corrected target superheat) = 1 * (1-corrected target superheat) ≈ -2.66. The main valve adjustment is an integer, and the main valve is closed 2 steps.

[0085] After the above-mentioned reduction valve, the refrigerant in the main circuit is reduced, and the real-time superheat of the main circuit becomes larger. At this time, the refrigerant begins to enter the auxiliary circuit, and the heat pump enters the cut-off state. Because the refrigerant flows through the economizer, the real-time superheat of the auxiliary circuit is reduced.

[0086] After the above-mentioned main valve is reduced and the real-time superheat of the auxiliary road is reduced, at a certain moment, the real-time superheat of the main road increases to 2, and the corrected target superheat is reduced to 2. At this moment, the main valve is not adjusted, but the refrigerant in the auxiliary road will increase, and the real-time superheat of the auxiliary road will continue to decrease.

[0087] At a certain moment, the real-time superheat of the auxiliary road is reduced to 0, and the new corrected target superheat is equal to the preset target superheat of the main road, which is 1. The real-time superheat of the main road is 2. Since the real-time superheat of the main road is greater than the corrected target superheat of the main road, the main valve of the main road is increased, and the valve compensation value = valve coefficient * (real-time superheat of the main road - corrected target superheat) = 1. If the main valve adjustment is an integer, the main valve needs to be increased by 1 step.

[0088] As described above, the real-time superheat of the auxiliary circuit is continuously used to correct the target superheat of the main circuit to obtain the corrected target superheat, the main valve is adjusted according to the corrected target superheat, and the corrected target superheat is continuously and dynamically adjusted according to the real-time superheat of the auxiliary circuit, gradually weakening the compensation effect of the main valve, which can avoid over-adjustment of the main valve, put the heat pump in a better operating state, and avoid safety accidents caused by excessive exhaust temperature of the compressor.

[0089] See also Figure 4 , Figure 4 It is a schematic diagram of the framework structure of an embodiment of the controller of the present application. The controller 40 in this embodiment is applied to a heat pump machine including a main circuit and an auxiliary circuit, wherein the main circuit is provided with a main valve, and the auxiliary circuit is provided with an auxiliary valve, and the controller 40 controls the opening of the main valve through the control method of any of the above embodiments. Specifically, the controller 40 includes an acquisition module 41, a correction module 42, a judgment module 43 and a main valve control module 44. The acquisition module 41 is used to obtain the real-time superheat of the main circuit and the real-time superheat of the auxiliary circuit. The correction module 42 is connected to the acquisition module 41, and the correction module 42 is used to correct the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain the corrected target superheat. The judgment module 43 is connected to the correction module 42, and the judgment module 43 is used to judge whether the corrected target superheat is the same as the real-time superheat of the main circuit. The main valve control module 44 is connected to the main valve, and is also connected to the correction module 42 and the judgment module 43. The main valve control module 44 is used to control the opening of the main valve; when the judgment module 43 determines that the corrected target superheat is different from the real-time superheat of the main path, the main valve control module 44 adjusts the opening of the main valve according to the real-time superheat of the main path and the corrected target superheat. When the corrected target superheat is the same as the real-time superheat of the main path, the judgment module 43 determines whether the real-time superheat of the auxiliary path is stable. If the real-time superheat of the auxiliary path is stable, the main valve control module 44 completes the valve adjustment.

[0090] In one embodiment, the acquisition module 41 acquires the real-time superheat of the auxiliary road, and the correction module 42 corrects the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the corrected target superheat step, specifically including: acquiring the real-time superheat of the auxiliary road and the auxiliary valve coefficient; wherein the calculation method of the corrected target superheat is: corrected target superheat = preset target superheat + real-time superheat of the auxiliary road ÷ auxiliary valve coefficient.

[0091] In one embodiment, the main valve control module 44 adjusts the opening of the main valve according to the real-time superheat of the main circuit and the corrected target superheat, specifically including: judging the magnitude of the real-time superheat of the main circuit and the corrected target superheat; if the real-time superheat of the main circuit is greater than the corrected target superheat, increasing the opening of the main valve; if the real-time superheat of the main circuit is less than the corrected target superheat, reducing the opening of the main valve.

[0092] In one embodiment, if the real-time superheat of the main circuit is greater than the corrected target superheat, the main valve control module 44 calculates the valve-adding compensation value of the main valve, and controls the opening of the main valve to increase the valve-adding compensation value; wherein, the calculation formula of the valve-adding compensation value is: valve-adding compensation value = valve-adding coefficient * (real-time superheat of the main circuit - corrected target superheat); if the real-time superheat of the main circuit is less than the corrected target superheat, the main valve control module 44 calculates the valve-reducing compensation value of the main valve, and controls the opening of the main valve to reduce the valve-reducing compensation value; wherein, the calculation formula of the valve-reducing compensation value is: valve-reducing compensation value = valve-reducing coefficient * (real-time superheat of the main circuit - corrected target superheat).

[0093] In one embodiment, the acquisition module 41 acquires the return air temperature of the compressor and the external disk temperature of the evaporator, and calculates the difference between the external disk temperature of the evaporator and the return air temperature of the compressor to obtain the real-time superheat of the main circuit; the auxiliary circuit of the heat pump machine is provided with an economizer, and the acquisition module 41 acquires the inlet temperature and outlet temperature of the auxiliary circuit in the economizer, and calculates the difference between the inlet temperature and the outlet temperature to obtain the real-time superheat of the auxiliary circuit.

[0094] See also Figure 5 , Figure 5 Schematic diagram of the framework structure of another embodiment of the controller of the present application. The controller 50 in this embodiment includes a processor 501 and a memory 502 connected to each other; wherein the memory 502 stores program instructions, and the processor 501 retrieves the program instructions from the memory 502 to execute the steps of any of the above-mentioned opening control method embodiments.

[0095] Specifically, the processor 501 is used to control itself and the memory 502 to implement the steps of any of the above-mentioned embodiments of the opening control method. The processor 501 can also be called a CPU (Central Processing Unit). The processor 501 may be an integrated circuit chip with signal processing capabilities. The processor 501 can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 501 can be implemented by an integrated circuit chip.

[0096] For specific contents of the opening control method implemented by the processor 501 of the present application, please refer to the contents in the above-mentioned heat pump valve opening control method embodiment, which will not be repeated here.

[0097] See also Figure 6 , Figure 6 It is a schematic diagram of the heat pump structure of the present application. The heat pump 60 in this embodiment includes an evaporator 62, a compressor 63, a condenser 64, an economizer 65 and a controller; the first end of the condenser 64 is connected to the first end of the evaporator 62 through a main line 66; the second end of the evaporator 62 is connected to the return air end of the compressor 63; the first end of the condenser 64 is also connected to the return air end of the compressor 63 through an auxiliary line 67; the exhaust end of the compressor 63 is connected to the second end of the condenser 64; the main line 66 is provided with a main valve 611, and the auxiliary line 67 is provided with an auxiliary valve 612; the main line 66 and the auxiliary line 67 both pass through the economizer 65; the controller is connected to the main valve 611, and the controller is the controller 40 or the controller 50.

[0098] See also Figure 7 , Figure 7 The computer-readable storage medium 70 of the present application stores program instructions 700 thereon, and when the program instructions 700 are executed by a processor, the steps in any of the above-mentioned opening control method embodiments are implemented.

[0099] The computer-readable storage medium 70 may specifically be a medium that can store the program instructions 700, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or may be a server that stores the program instructions 700. The server may send the stored program instructions 700 to other devices for execution, or may execute the stored program instructions 700 by itself.

[0100] In the several embodiments provided in the present application, it should be understood that the disclosed methods, devices and apparatuses can be implemented in other ways. For example, the above-described device and apparatus implementation methods are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0102] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0103] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

Claims

1. A method for controlling valve opening of a heat pump, characterized in that: The control method comprises: Control the opening of the main valve to make the real-time superheat of the main circuit close to the preset target superheat of the main circuit; Acquiring a real-time superheat of the auxiliary circuit, and correcting a preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain a corrected target superheat; determining whether the corrected target superheat is the same as the real-time superheat of the main path; If the modified target superheat is different from the real-time superheat of the main circuit, adjusting the opening of the main valve according to the real-time superheat of the main circuit and the modified target superheat; executing the step of obtaining the real-time superheat of the auxiliary circuit, and modifying the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain the modified target superheat; If the modified target superheat is the same as the real-time superheat of the main road, determine whether the real-time superheat of the auxiliary road has stabilized, and if the real-time superheat of the auxiliary road has stabilized, complete the valve adjustment; if the real-time superheat of the auxiliary road is not stable; execute the step of obtaining the real-time superheat of the auxiliary road, and modifying the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the modified target superheat; The step of obtaining the real-time superheat of the auxiliary circuit and correcting the preset target superheat of the main circuit based on the real-time superheat of the auxiliary circuit to obtain the corrected target superheat specifically includes: Obtaining the real-time superheat and auxiliary valve coefficient of the auxiliary circuit; The calculation method of the modified target superheat is as follows: Corrected target superheat = preset target superheat + real-time superheat of auxiliary line ÷ auxiliary valve coefficient; The step of adjusting the opening of the main valve according to the real-time superheat of the main path and the corrected target superheat specifically includes: Determining the magnitude of the real-time superheat of the main path and the corrected target superheat; If the real-time superheat of the main circuit is greater than the corrected target superheat, the opening of the main valve is increased; if the real-time superheat of the main circuit is less than the corrected target superheat, the opening of the main valve is reduced; If the real-time superheat of the main circuit is greater than the corrected target superheat, the valve-adding compensation value of the main valve is calculated, and the opening of the main valve is controlled to increase the valve-adding compensation value; wherein the calculation formula of the valve-adding compensation value is: valve-adding compensation value = valve-adding coefficient * (real-time superheat of the main circuit - corrected target superheat); If the real-time superheat of the main circuit is less than the corrected target superheat, the valve reduction compensation value of the main valve is calculated, and the opening of the main valve is controlled to reduce the valve reduction compensation value; wherein the calculation formula of the valve reduction compensation value is: valve reduction compensation value = valve reduction coefficient * (real-time superheat of the main circuit - corrected target superheat); Obtaining the return air temperature of the compressor and the outer disk temperature of the evaporator, and calculating the difference between the outer disk temperature of the evaporator and the return air temperature of the compressor to obtain the real-time superheat of the main circuit; The auxiliary circuit of the heat pump machine is provided with an economizer, the inlet temperature and outlet temperature of the auxiliary circuit in the economizer are obtained, and the difference between the inlet temperature and the outlet temperature is calculated to obtain the real-time superheat of the auxiliary circuit.

2. A controller, characterized in that: Applicable to a heat pump machine including a main circuit and an auxiliary circuit, wherein the main circuit is provided with a main valve and the auxiliary circuit is provided with an auxiliary valve, the controller controls the opening of the main valve by the control method according to claim 1, and the controller comprises: An acquisition module, the acquisition module is used to acquire the real-time superheat of the main road and the real-time superheat of the auxiliary road; a correction module, the correction module being connected to the acquisition module, and the correction module being used to correct a preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain a corrected target superheat; a judgment module, the judgment module being connected to the correction module, and the judgment module being used to judge whether the corrected target superheat is the same as the real-time superheat of the main circuit; A main valve control module, the main valve control module is connected to the main valve, the main valve control module is also connected to the correction module and the judgment module, the main valve control module is used to control the opening of the main valve; the main valve control module also adjusts the opening of the main valve according to the real-time superheat of the main road and the corrected target superheat when the judgment module judges that the corrected target superheat is different from the real-time superheat of the main road; The judgment module also judges whether the real-time superheat of the auxiliary circuit has stabilized when the corrected target superheat is the same as the real-time superheat of the main circuit. If the real-time superheat of the auxiliary circuit has stabilized, the main valve control module completes the valve adjustment.

3. The controller according to claim 2, characterized in that: The acquisition module acquires the real-time superheat of the auxiliary road, and the correction module corrects the preset target superheat of the main road based on the real-time superheat of the auxiliary road to obtain the corrected target superheat step, specifically including: acquiring the real-time superheat of the auxiliary road and the auxiliary valve coefficient; wherein the calculation method of the corrected target superheat is: corrected target superheat=preset target superheat+real-time superheat of the auxiliary road÷auxiliary valve coefficient.

4. The controller according to claim 3, characterized in that: The main valve control module adjusts the opening of the main valve according to the real-time superheat of the main circuit and the corrected target superheat, specifically comprising: judging the magnitude of the real-time superheat of the main circuit and the corrected target superheat; if the real-time superheat of the main circuit is greater than the corrected target superheat, increasing the opening of the main valve; if the real-time superheat of the main circuit is less than the corrected target superheat, reducing the opening of the main valve.

5. The controller according to claim 4, characterized in that: If the real-time superheat of the main circuit is greater than the corrected target superheat, the main valve control module calculates the valve-adding compensation value of the main valve, controls the opening of the main valve to increase the valve-adding compensation value; wherein, the calculation formula of the valve-adding compensation value is: valve-adding compensation value = valve-adding coefficient * (real-time superheat of the main circuit - corrected target superheat); if the real-time superheat of the main circuit is less than the corrected target superheat, the main valve control module calculates the valve-reducing compensation value of the main valve, controls the opening of the main valve to reduce the valve-reducing compensation value; wherein, the calculation formula of the valve-reducing compensation value is: valve-reducing compensation value = valve-reducing coefficient * (real-time superheat of the main circuit - corrected target superheat).

6. The controller according to claim 5, characterized in that: The acquisition module acquires the return air temperature of the compressor and the outer disk temperature of the evaporator, and calculates the difference between the outer disk temperature of the evaporator and the return air temperature of the compressor to obtain the real-time superheat of the main circuit; the auxiliary circuit of the heat pump machine is provided with an economizer, and the acquisition module acquires the inlet temperature and outlet temperature of the auxiliary circuit in the economizer, and calculates the difference between the inlet temperature and the outlet temperature to obtain the real-time superheat of the auxiliary circuit.

7. A controller, characterized in that: It comprises a processor and a memory connected to each other; wherein the memory stores program instructions, and the processor retrieves the program instructions from the memory to execute the control method as claimed in claim 1.

8. A heat pump, characterized in that: The heat pump machine includes an evaporator, a compressor, a condenser, an economizer and a controller; the first end of the condenser is connected to the first end of the evaporator through a main road; the second end of the evaporator is connected to the return air end of the compressor; the first end of the condenser is also connected to the return air end of the compressor through an auxiliary road; the exhaust end of the compressor is connected to the second end of the condenser; the main road is provided with a main valve, and the auxiliary road is provided with an auxiliary valve; the main road and the auxiliary road both pass through the economizer; the controller is connected to the main valve, and the controller is the controller described in any one of claims 2-6 or claim 7.

9. A computer-readable storage medium, characterized in that: Program instructions are stored thereon, and when the program instructions are executed by a processor, the control method as claimed in claim 1 is implemented.

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