Control method and device of electronic expansion valve, air conditioner and storage medium

Abstract

The invention relates to a control method and device for an electronic expansion valve, an air conditioner and a storage medium. The method comprises the steps that air conditioner operation information corresponding to the air conditioner is obtained; determining a target working condition corresponding to the air conditioner from a preset working condition set based on the air conditioner operation information; based on the target working condition, a target control strategy corresponding to the air conditioner is determined from a preset control strategy set, each preset control strategy in the preset control strategy set is used for indicating a control strategy of the opening degree of an electronic expansion valve in the air conditioner under the preset working condition, and the preset working condition belongs to the preset working condition set; and controlling the opening degree of the electronic expansion valve based on the target control strategy. The opening degree of the electronic expansion valve meets the dynamic working condition of the air conditioner, so that the defects caused by controlling the opening degree of the electronic expansion valve through a single parameter are overcome, and efficient and stable operation of the air conditioner is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a control method and device for an electronic expansion valve, an air conditioner and a storage medium. BACKGROUND

[0002] In an air conditioner, an electronic expansion valve serves as a key throttling element, and its opening degree plays a decisive role in the energy efficiency, stability and reliability of the air conditioner. The control target of the electronic expansion valve is to accurately regulate the refrigerant flow in the air conditioner to match the real-time system load of the air conditioner.

[0003] At present, when the opening degree of the electronic expansion valve is controlled, the suction superheat degree of a compressor in the air conditioner is usually obtained to control the opening degree of the electronic expansion valve so that the suction superheat degree of the compressor is maintained near an ideal suction superheat degree. However, the above control method of the electronic expansion valve only relies on a single parameter for control, and the working condition of the air conditioner is dynamically variable, so that the use of a single parameter to control the opening degree of the electronic expansion valve cannot meet the needs of different working conditions, affecting the efficient and stable operation of the air conditioner. SUMMARY

[0004] The present application provides a control method and device for an electronic expansion valve, an air conditioner and a storage medium to solve the problem that the use of a single parameter to control the opening degree of the electronic expansion valve cannot meet the needs of different working conditions, affecting the efficient and stable operation of the air conditioner.

[0005] In a first aspect, the present application provides a control method for an electronic expansion valve, comprising: obtaining air conditioner running information corresponding to an air conditioner; determining a target working condition corresponding to the air conditioner from a preset working condition set based on the air conditioner running information; determining a target control strategy corresponding to the air conditioner from a preset control strategy set based on the target working condition, each preset control strategy in the preset control strategy set being used to indicate a control strategy of an opening degree of an electronic expansion valve in the air conditioner under a preset working condition, and the preset working condition belonging to the preset working condition set; controlling the opening degree of the electronic expansion valve based on the target control strategy.

[0006] In an optional implementation, the air conditioner running information includes a suction superheat degree of a compressor in the air conditioner, an environmental humidity of an indoor environment in which the air conditioner is located, a running mode of the air conditioner, a running frequency of the compressor and a coil temperature of an outdoor coil in the air conditioner. The determining of the target control strategy corresponding to the air conditioner from the preset control strategy set comprises: match the air conditioner running information with each preset trigger condition in a preset trigger condition set to determine a matched target trigger condition from the preset trigger condition set; determine a target working condition of the air conditioner from the preset working condition set based on the target trigger condition; The preset trigger condition set includes the following preset trigger conditions: a duration that the suction gas superheat degree is in a preset superheat degree interval reaches a first preset duration; the running frequency is less than a preset frequency threshold and a fluctuation amplitude of the suction gas superheat degree is greater than a preset fluctuation threshold; a duration that the running mode is a heating mode and the coil temperature is less than a preset temperature threshold reaches a second preset duration; the running mode is a cooling mode and the environment humidity is greater than a preset humidity threshold; a change rate of the running frequency is greater than a preset change rate threshold.

[0007] In an optional implementation, when the target trigger condition includes that the duration that the suction gas superheat degree is in the preset superheat degree interval reaches the first preset duration, the target working condition is a first working condition, and a target control strategy corresponding to the first working condition is a first control strategy. The control on the opening degree of the electronic expansion valve based on the target control strategy includes: When the target control strategy is the first control strategy, a first deviation between the suction gas superheat degree and a first superheat degree threshold corresponding to the compressor in the first working condition is determined. Based on the first deviation and a first PID algorithm, the opening degree of the electronic expansion valve is controlled in a first change rate interval corresponding to the opening degree of the electronic expansion valve, so that the suction gas superheat degree reaches the first superheat degree threshold.

[0008] In an optional implementation, the air conditioner running information further includes an evaporation pressure of an evaporator in the air conditioner; when the target trigger condition includes that the running frequency is less than a preset frequency threshold and a fluctuation amplitude of the suction gas superheat degree is greater than a preset fluctuation threshold, the target working condition is a second working condition, and a target control strategy corresponding to the second working condition is a second control strategy. The control on the opening degree of the electronic expansion valve based on the target control strategy includes: When the target control strategy is the second control strategy, a second deviation between the evaporation pressure and a preset pressure threshold corresponding to the evaporator in the second working condition is determined. control the opening degree of the electronic expansion valve based on the target control strategy, including: determining a first target opening degree of the electronic expansion valve based on the target control strategy, when the target control strategy is the first control strategy; determining a second target opening degree of the electronic expansion valve based on the target control strategy, when the target control strategy is the second control strategy; determining a third target opening degree of the electronic expansion valve based on the target control strategy, when the target control strategy is the third control strategy; determining a fourth target opening degree of the electronic expansion valve based on the target control strategy, when the target control strategy is the fourth control strategy; and determining a fifth target opening degree of the electronic expansion valve based on the target control strategy, when the target control strategy is the fifth control strategy.

[0009] In an optional implementation, when the target trigger condition comprises that the operating mode is the heating mode and the duration that the coil temperature is less than the preset temperature threshold reaches a second preset duration, the target working condition is a third working condition, and the target control strategy corresponding to the third working condition is a third control strategy. The control of the opening degree of the electronic expansion valve based on the target control strategy comprises: When the target control strategy is the third control strategy, a first target opening degree corresponding to the electronic expansion valve is determined based on the coil temperature. The opening degree of the electronic expansion valve is controlled to the first target opening degree, and the operating mode is switched from the heating mode to the cooling mode and the outdoor fan in the air conditioner is controlled to stop working while the opening degree of the electronic expansion valve is controlled.

[0010] In an optional implementation, the air conditioner operating information further comprises a dew point temperature of the air conditioner, when the target trigger condition comprises that the operating mode is the cooling mode and the ambient humidity is greater than a preset humidity threshold, the target working condition is a fourth working condition, and the target control strategy corresponding to the fourth working condition is a fourth control strategy. The control of the opening degree of the electronic expansion valve based on the target control strategy comprises: When the target control strategy is the fourth control strategy, a second superheat threshold corresponding to the compressor in the fourth working condition is determined based on the dew point temperature, and a third deviation between the suction superheat and the second superheat threshold is determined. The opening degree of the electronic expansion valve is controlled in a third change rate interval corresponding to the opening degree of the electronic expansion valve based on the third deviation and a third PID algorithm, so that the suction superheat reaches the second superheat threshold, and the speed of the indoor fan in the air conditioner is controlled to decrease while the opening degree of the electronic expansion valve is controlled.

[0011] In an optional implementation, when the target trigger condition comprises that the change rate of the operating frequency is greater than a preset change rate threshold, the target working condition is a fifth working condition, and the target control strategy corresponding to the fifth working condition is a fifth control strategy. The control of the opening degree of the electronic expansion valve based on the target control strategy comprises: When the target control strategy is the fifth control strategy, a compensation opening degree corresponding to the electronic expansion valve is determined based on the change rate of the operating frequency, and a fourth deviation between the suction gas superheat degree and a third superheat threshold corresponding to the compressor under the fifth working condition is determined; A second target opening degree corresponding to the electronic expansion valve is determined in a fourth change rate interval of the opening degree of the electronic expansion valve based on the fourth deviation and a first fuzzy control algorithm; The opening degree of the electronic expansion valve is controlled based on the compensation opening degree and the second target opening degree, and the speed of the indoor fan in the air conditioner is controlled to be increased at the same time of controlling the opening degree of the electronic expansion valve.

[0012] In an optional implementation, the set of preset trigger conditions further comprises a preset trigger condition that the suction gas superheat degree is less than a fourth superheat threshold, the fourth superheat threshold being used to represent a minimum value of the suction gas superheat degree allowed for the operation of the compressor; The target working condition corresponding to the air conditioner is determined from the set of preset working conditions based on the target trigger condition, which comprises: When the target trigger condition is multiple and there is a first target trigger condition among the multiple target trigger conditions, the target working condition corresponding to the air conditioner is determined from the set of preset working conditions based on the first target trigger condition; wherein the target working condition is a sixth working condition, the target control strategy corresponding to the sixth working condition is a sixth control strategy, and the first target trigger condition comprises that the suction gas superheat degree is less than a fourth superheat threshold; The control of the opening degree of the electronic expansion valve based on the target control strategy comprises: When the target control strategy is the sixth control strategy, the opening degree of the electronic expansion valve is controlled based on a preset opening degree corresponding to the electronic expansion valve under the sixth working condition.

[0013] In a second aspect, the application provides a control device of an electronic expansion valve, which comprises: An acquisition module is configured to acquire air conditioner operating information corresponding to an air conditioner; A determination module is configured to determine a target working condition corresponding to the air conditioner from a set of preset working conditions based on the air conditioner operating information; The determination module is further configured to determine a target control strategy corresponding to the air conditioner from a set of preset control strategies based on the target working condition, each preset control strategy in the set of preset control strategies being used to indicate a control strategy of an opening degree of an electronic expansion valve in the air conditioner under a preset working condition, and the preset working condition belonging to the set of preset working conditions. a control module configured to control the opening degree of the electronic expansion valve based on the target control strategy.

[0014] In a third aspect, the present application provides an air conditioner, comprising: a processor and a memory, the processor is configured to execute a control program of an electronic expansion valve stored in the memory, so as to implement the control method of the electronic expansion valve.

[0015] In a fourth aspect, the present application provides a storage medium, the storage medium stores one or more programs, the one or more programs can be executed by one or more processors to implement the control method of the electronic expansion valve.

[0016] The above technical solution provided by the embodiments of the present application has the following advantages compared with the prior art. The control method of the photovoltaic module provided by the embodiments of the present application comprises: obtaining air conditioner running information corresponding to an air conditioner; determining a target working condition corresponding to the air conditioner from a preset working condition set based on the air conditioner running information; determining a target control strategy corresponding to the air conditioner from a preset control strategy set based on the target working condition, each preset control strategy in the preset control strategy set being used to indicate a control strategy of an opening degree of an electronic expansion valve in the air conditioner under a preset working condition, and the preset working condition belonging to the preset working condition set; and controlling the opening degree of the electronic expansion valve based on the target control strategy. In the above manner, the embodiments of the present application pre-set a preset working condition set associated with the air conditioner and a preset control strategy set associated with the opening degree of the electronic expansion valve in the air conditioner, so as to obtain the air conditioner running information of the air conditioner during the running of the air conditioner, and then match the target working condition corresponding to the air conditioner from the preset working condition set by using the air conditioner running information, and further match the target control strategy from the preset control strategy set by using the target working condition, so as to control the opening degree of the electronic expansion valve by using the target control strategy, so that the opening degree of the electronic expansion valve meets the dynamic working condition of the air conditioner, thereby avoiding the disadvantages of controlling the opening degree of the electronic expansion valve by using a single parameter, and ensuring the efficient and stable running of the air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative work.

[0019] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which demonstrate aspects of the embodiments. It is to be understood that the same or similar elements shown in different figures can in fact be the same element.

[0020] Figure 1 A flowchart of a control method of an electronic expansion valve provided by an embodiment of the present application is shown in the figure. Figure 2 A flowchart of a control method of an electronic expansion valve provided by another embodiment of the present application is shown in the figure. Figure 3 A structural diagram of a control device of an electronic expansion valve provided by an embodiment of the present application is shown in the figure. Figure 4 A structural diagram of an air conditioner provided by an embodiment of the present application is shown in the figure. In the above figures: 10, acquisition module; 20, determination module; 30, control module; 400, air conditioner; 401, processor; 402, memory; 4021, operating system; 4022, application program; 403, user interface; 404, network interface; 405, bus system. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0022] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the components and arrangements of the various examples are shown in the following description. It is understood, however, that they are not limited to the specific examples presented. Additionally, the present application can be repeated with either different systems or variations of the same system in order to provide a family of related products.

[0023] Reference Figure 1 , Figure 1 A flowchart of a control method of an electronic expansion valve provided by an embodiment of the present application is shown in the figure. The control method of an electronic expansion valve provided by an embodiment of the present application includes the following steps: S101: acquiring air conditioner running information corresponding to an air conditioner.

[0024] In the embodiment, the air conditioner operation information is no longer a single suction superheat degree, and the air conditioner operation information is a multi-dimensional parameter set including directly measured parameters and indirectly obtained parameters.

[0025] The directly measured parameters can include the environment humidity of the indoor environment where the air conditioner is located, the operation mode of the air conditioner, and the coil temperature of the outdoor coil in the air conditioner. The humidity sensor can be arranged on the indoor unit of the air conditioner to obtain the environment humidity of the indoor environment where the air conditioner is located. The temperature sensor can be arranged on the outdoor coil in the air conditioner to obtain the coil temperature of the outdoor coil in the air conditioner. The operation mode of the air conditioner can be set by the user based on the remote controller or the application, and the operation mode of the air conditioner can be obtained by analyzing the mode setting instruction received by the air conditioner. The operation mode can include the heating mode, the cooling mode, and the like.

[0026] The indirectly obtained parameters can be the suction superheat degree of the compressor in the air conditioner and the operation frequency of the compressor in the air conditioner. The suction superheat degree is the difference between the suction temperature of the compressor and the saturation temperature under the corresponding evaporation pressure. The rotation speed can be obtained by obtaining the rotation speed of the compressor to calculate the operation frequency of the compressor. The specific calculation method of the suction superheat degree and the operation frequency can refer to the prior art, which will not be further described in the embodiment.

[0027] S102: Based on the air conditioner operation information, a target working condition corresponding to the air conditioner is determined from a preset working condition set.

[0028] In the embodiment, the preset working condition set includes a plurality of preset working conditions, and the preset working condition set defines the dynamic change of each operation working condition of the air conditioner during operation. The preset working condition set can include a stable operation working condition, a low-load stable flow working condition, a defrosting working condition, a high-energy-efficiency dehumidification working condition, a transient change working condition, and a protection working condition. Each preset working condition in the preset working condition set will be further described below, and the embodiment will not be described in detail.

[0029] After obtaining the air conditioner operation information corresponding to the air conditioner, the air conditioner operation information can be logically judged to dynamically select a preset working condition most suitable for the current air conditioner operation information from the preset working condition set, so as to determine the preset working condition as the target working condition corresponding to the air conditioner, and then utilize the target working condition to control the opening degree of the electronic expansion valve, so that the opening degree of the controlled electronic expansion valve meets the current operation working condition of the air conditioner, and the efficient and stable operation of the air conditioner is ensured.

[0030] S103: Based on the target working condition, a target control strategy corresponding to the air conditioner is determined from a preset control strategy set.

[0031] In the embodiment, each preset control strategy in the preset control strategy set is used to indicate a control strategy of the opening degree of the electronic expansion valve in the air conditioner under a preset working condition, and the preset working condition belongs to the preset working condition set. The preset control strategy is actually a control strategy of the opening degree of the electronic expansion valve that is most suitable for the preset working condition, so that the opening degree of the electronic expansion valve meets the preset working condition.

[0032] Specifically, the first association relationship can be preset, and the first association relationship stores a corresponding relationship between each preset working condition in the preset working condition set and each preset strategy in the preset strategy set. After the target working condition is determined from the preset working condition set, the first association relationship can be queried based on the target working condition to query the preset strategy corresponding to the target working condition from the first association relationship, so as to determine the preset strategy corresponding to the target working condition as the target control strategy corresponding to the air conditioner.

[0033] S104: Control the opening degree of the electronic expansion valve based on the target control strategy.

[0034] In the embodiment, after the target control strategy is determined, the control algorithm, algorithm parameters, and the like indicated by the target control strategy are used to determine the opening degree required to be adjusted by the electronic expansion valve, and a control instruction is generated based on the required opening degree. The control instruction is sent to the electronic expansion valve, so that the electronic expansion valve controls the opening degree of the electronic expansion valve to the opening degree included in the control instruction based on the opening degree included in the control instruction, to complete the control of the opening degree of the electronic expansion valve, thereby realizing the adaptation of the opening degree of the electronic expansion valve to the dynamically changing working condition of the air conditioner, and ensuring the efficient and stable operation of the air conditioner.

[0035] The control method of the electronic expansion valve provided in the embodiment is used to pre-set a preset working condition set associated with the air conditioner and a preset control strategy set associated with the opening degree of the electronic expansion valve in the air conditioner, so as to acquire air conditioner running information of the air conditioner during air conditioner operation, to match the target working condition corresponding to the air conditioner from the preset working condition set by using the air conditioner running information, to match the target control strategy from the preset control strategy set by using the target working condition, and to control the opening degree of the electronic expansion valve by using the target control strategy, so that the opening degree of the electronic expansion valve meets the dynamic working condition of the air conditioner. The control method avoids the disadvantages of using a single parameter to control the opening degree of the electronic expansion valve, and ensures the efficient and stable operation of the air conditioner.

[0036] Reference Figure 2 , Figure 2 This is another flowchart of the control method of the electronic expansion valve provided in the embodiment. The control method of the electronic expansion valve provided in the embodiment includes the following steps: S201: Acquire air conditioner running information corresponding to the air conditioner.

[0037] In the embodiment, the step S201 is consistent with the step S101 described above, and details can be referred to the description of the step S101. The operation information of the air conditioner includes suction superheat of the compressor in the air conditioner, environmental humidity of the indoor environment where the air conditioner is located, operation mode of the air conditioner, operation frequency of the compressor, and coil temperature of the outdoor coil in the air conditioner.

[0038] S202: Matching the operation information of the air conditioner with each preset trigger condition in the set of preset trigger conditions to determine the matched target trigger condition from the set of preset trigger conditions.

[0039] S203: Based on the target trigger condition, determining the target working condition corresponding to the air conditioner from the set of preset working conditions.

[0040] For the steps S202 and S203 described above, the set of preset trigger conditions includes a plurality of preset trigger conditions, each of which is a logical rule that can be judged. The preset trigger condition is actually a judgment condition of the operation working condition of the air conditioner. After obtaining the operation information of the air conditioner, the operation information of the air conditioner is matched with each preset trigger condition in the set of preset trigger conditions to determine the target trigger condition matched with the operation information of the air conditioner from the set of preset trigger conditions.

[0041] After obtaining the target trigger condition, the second association relationship set in advance can be queried based on the target trigger condition to determine the preset working condition corresponding to the target trigger condition from the second association relationship. The preset working condition corresponding to the target trigger condition is determined as the target working condition corresponding to the air conditioner. The second association relationship stores the corresponding relationship between each preset trigger condition in the set of preset trigger conditions and each preset working condition in the set of preset working conditions.

[0042] The set of preset trigger conditions in the above includes a first trigger condition, a second trigger condition, a third trigger condition, a fourth trigger condition, a fifth trigger condition, and a sixth trigger condition. The target working condition corresponding to the first trigger condition is the first working condition, the target working condition corresponding to the second trigger condition is the second working condition, the target working condition corresponding to the third trigger condition is the third working condition, the target working condition corresponding to the fourth trigger condition is the fourth working condition, the target working condition corresponding to the fifth trigger condition is the fifth working condition, and the target working condition corresponding to the sixth trigger condition is the fifth working condition.

[0043] The first working condition is a stable running working condition, which can be understood as a working condition in which the air conditioner continuously and stably runs. The second working condition is a low-load stable flow working condition, which can be understood as a working condition in which the air conditioner is unstable and oscillates. The third working condition is a defrosting working condition, which can be understood as a working condition in which the performance of the air conditioner decays. The fourth working condition is a high-energy-efficiency dehumidifying working condition, which can be understood as a working condition in which the comfort demand of the air conditioner is met. The fifth working condition is a transient change working condition, which can be understood as a working condition in which the load of the air conditioner changes dramatically. The sixth working condition is a protection working condition, which can be understood as a working condition in which the air conditioner is abnormal. For any one of the first working condition, the second working condition, the third working condition, the fourth working condition, and the fifth working condition, if a preset triggering condition of any one of the first working condition, the second working condition, the third working condition, the fourth working condition, the fifth working condition, and the sixth working condition is met, the corresponding working condition is switched to, and the opening degree of the electronic expansion valve is controlled based on the working condition. The sixth working condition among the first working condition, the second working condition, the third working condition, the fourth working condition, the fifth working condition, and the sixth working condition has the highest priority, that is, when multiple preset triggering conditions are met and there is a first target triggering condition (that is, a preset triggering condition corresponding to the sixth working condition) among the multiple preset triggering conditions, it is determined that the working condition of the current air conditioner is the sixth working condition, and at this time, the opening degree of the electronic expansion valve is controlled based on the sixth working condition to protect the safe operation of the air conditioner.

[0044] The first triggering condition includes that a duration in which the suction gas superheat degree is in the preset superheat degree interval reaches a first preset duration. The preset superheat degree is actually set based on the optimal suction gas superheat degree of the compressor, for example, when the optimal suction gas superheat degree is 5K, the preset superheat degree interval is [4.5K, 5.5K], and the first preset duration can be set according to actual needs in the embodiment, for example, the first preset duration can be 1 minute, and the specific value of the first preset duration is not limited in the embodiment. The preset superheat degree interval corresponding to the suction gas superheat degree is set to tolerate the normal fluctuation of the suction gas superheat degree, and the stable state is confirmed by the duration, and whether the air conditioner is truly stably running is determined by the above two conditions, and when the above two conditions are met, it is determined that the target working condition of the air conditioner is the first working condition.

[0045] The second triggering condition comprises that the running frequency is less than a preset frequency threshold and the fluctuation amplitude of the suction superheat is greater than a preset fluctuation threshold. The preset frequency threshold is used to represent the maximum value of the running frequency of the compressor when the air conditioner is unstable, and the preset fluctuation threshold is used to represent the minimum value of the fluctuation amplitude when the air conditioner is unstable. The preset frequency threshold can be set based on the low load running state of the air conditioner, and the preset frequency threshold and the preset fluctuation threshold can be set according to actual needs. The specific values of the preset frequency threshold and the preset fluctuation threshold are not limited in the embodiment. The fluctuation amplitude of the suction superheat can be understood as the difference between the suction superheat at the current time and the suction superheat at the last time. By setting the preset frequency threshold and the preset fluctuation amplitude, it is determined whether the air conditioner is in an unstable oscillation working condition. When both conditions are met, it is determined that the target working condition of the air conditioner is the second working condition.

[0046] The third triggering condition comprises that the running mode is a heating mode and the duration that the coil temperature is less than a preset temperature threshold reaches a second preset duration. Since the outdoor unit in the air conditioner acts as an evaporator to absorb heat from the outdoor environment in the heating mode, the outdoor coil will frost. The coil temperature of the outdoor coil in the outdoor unit is the main reason for frosting, and the duration ensures that defrosting is necessary. Therefore, the above two conditions are used to determine whether the air conditioner is in a high-efficiency defrosting working condition. When both conditions are met, it is determined that the target working condition of the air conditioner is the third working condition. The preset temperature threshold is used to represent the maximum value of the coil temperature corresponding to the frosting of the outdoor coil, and the second preset duration is used to represent the duration corresponding to the defrosting of the outdoor coil. The preset temperature threshold and the second preset duration can be set according to actual needs. The specific values of the preset temperature threshold and the second preset duration are not limited in the embodiment.

[0047] The fourth triggering condition comprises that the running mode is a cooling mode and the environmental humidity is greater than a preset humidity threshold. The preset humidity threshold is used to represent the minimum value of the environmental humidity corresponding to the dehumidification of the indoor environment, and the preset humidity threshold can be set according to actual needs. The specific value of the preset humidity threshold is not limited in the embodiment. Since dehumidification of the indoor environment is only possible in the cooling mode, the running mode of the air conditioner and the environmental humidity are determined. When both conditions are met, it is determined that the target working condition of the air conditioner is the fourth working condition.

[0048] The fifth trigger condition in the above comprises a change rate of the operating frequency being greater than a preset change rate threshold. Since the operating frequency of the compressor will suddenly change in the case that the air conditioner is started and the user changes the set temperature, in order to ensure the smooth operation of the air conditioner, this working condition is judged to control the opening degree of the electronic expansion valve based on the working condition. Therefore, the change rate of the operating frequency is determined during the operation of the air conditioner, so as to represent the transient change of the air conditioner when the change rate of the operating frequency is greater than the preset change rate threshold, and at this time, the target working condition corresponding to the air conditioner is determined as the fifth working condition, so as to facilitate the subsequent opening degree control of the electronic expansion valve. The preset change rate threshold is used to represent the minimum value of the change rate corresponding to the sudden change of the operating frequency of the compressor. The change rate of the operating frequency can be determined by determining a first difference value between the operating frequency at the current time and the operating frequency at the last time, and determining a second difference value between the current time and the last time, and determining the ratio between the first difference value and the second difference value as the change rate of the operating frequency.

[0049] The sixth trigger condition in the above comprises the suction superheat being less than a fourth superheat threshold. In order to prevent liquid strike from causing the abnormality of the air conditioner, thereby affecting the reliable operation of the air conditioner, the suction superheat and the fourth superheat threshold are judged, so as to determine the target working condition corresponding to the air conditioner as the sixth working condition when the suction superheat is less than the fourth superheat threshold, regardless of which one of the first working condition, the second working condition, the third working condition, the fourth working condition and the fifth working condition the current air conditioner is in. The fourth superheat threshold is used to represent the minimum value of the suction superheat of the compressor. The fourth superheat threshold can be set according to actual needs, and the specific value of the fourth superheat threshold is not limited in the embodiment.

[0050] The embodiment sets a preset trigger condition set to determine the dynamic working condition of the air conditioner based on the air conditioner running information corresponding to the air conditioner, so as to adaptively control the opening degree of the electronic expansion valve by using the dynamic working condition of the air conditioner, and ensure the efficient and stable operation of the air conditioner.

[0051] S204: When the target trigger condition is the first trigger condition, the target working condition is the first working condition, and the target control strategy corresponding to the first working condition is the first control strategy.

[0052] S205: When the target trigger condition is the second trigger condition, the target working condition is the second working condition, and the target control strategy corresponding to the second working condition is the second control strategy.

[0053] S206: When the target trigger condition is the third trigger condition, the target working condition is the third working condition, and the target control strategy corresponding to the third working condition is the third control strategy.

[0054] S207: When the target trigger condition is the fourth trigger condition, the target working condition is the fourth working condition, and the target control strategy corresponding to the fourth working condition is the fourth control strategy.

[0055] S208: When the target trigger condition is the fifth trigger condition, the target working condition is the fifth working condition, and the target control strategy corresponding to the fifth working condition is the fifth control strategy.

[0056] S209: When the target trigger condition is multiple and there is a sixth trigger condition in the multiple target trigger conditions, the target working condition is the sixth working condition, and the target control strategy corresponding to the sixth working condition is the sixth control strategy.

[0057] For the above S204 to S209 steps, the first control strategy, the second control strategy, the third control strategy, the fourth control strategy, the fifth control strategy, and the sixth control strategy will be described in detail as follows, and this embodiment will not be repeated here.

[0058] S210: Control the opening of the electronic expansion valve based on the target control strategy.

[0059] In this embodiment, when the target control strategy is the first control strategy, the opening of the electronic expansion valve can be controlled in the following manner, including: determining a first deviation between the suction superheat degree and a first superheat threshold corresponding to the compressor in the first working condition; controlling the opening of the electronic expansion valve in a first change rate interval corresponding to the opening of the electronic expansion valve based on the first deviation and a first PID algorithm, so that the suction superheat degree reaches the first superheat threshold.

[0060] The first superheat threshold is used to represent the optimal superheat degree of the compressor, for example, the first superheat threshold can be 5K, and the first superheat threshold can be set according to actual needs. The first PID algorithm is a first control parameter set pre-set based on the first working condition, and the first control parameter set includes a first proportional parameter, a first integral parameter, and a first differential parameter. The first control parameter set can be set according to actual needs. The first change rate interval is used to limit the change rate of the opening of the electronic expansion valve. No matter how large the opening determined based on the first PID algorithm is, the opening of the electronic expansion valve must be controlled within the first change rate interval. The first change rate interval can be ≤5% / second, and the first change rate interval can also be set according to actual needs.

[0061] After the first superheat threshold is obtained, the suction superheat is subtracted from the first superheat threshold, and a first deviation is obtained. The first deviation is an input signal of the first PID algorithm. The size and direction of the first deviation determine the strength and direction of the opening degree output by the first PID algorithm. The first deviation is input into the first PID algorithm, so that the first PID algorithm calculates the opening degree of the electronic expansion valve based on the first control parameter set. The current obtained opening degree of the electronic expansion valve is compared with the opening degree of the electronic expansion valve at the last time, to obtain an opening degree change rate. If the opening degree change rate is within the first change rate interval, the obtained opening degree of the electronic expansion valve is directly used to control the electronic expansion valve. If the opening degree change rate exceeds the first change rate interval, the obtained opening degree of the electronic expansion valve is limited to the maximum opening degree based on the first change rate interval, so as to control the electronic expansion valve by using the maximum opening degree. Through the above mode, in the first working condition, the deviation between the suction superheat and the first superheat threshold is monitored in real time, and the first PID algorithm is used for calculation, so as to realize smooth and accurate fine tuning of the opening degree of the electronic expansion valve in the first working condition. The suction superheat of the air conditioner is stably maintained at the optimal superheat, so as to ensure the highest operating energy efficiency and stability of the air conditioner in the first working condition.

[0062] In the embodiment, the air conditioner operating information further includes an evaporating pressure of an evaporator in the air conditioner. The evaporating pressure can be obtained by a pressure sensor arranged in the evaporator. When the target control strategy is the second control strategy, the opening degree of the electronic expansion valve can be controlled by the following mode, including: determining a second deviation between the evaporating pressure and a preset pressure threshold corresponding to the evaporator in the second working condition; controlling the opening degree of the electronic expansion valve in a second change rate interval corresponding to the opening degree of the electronic expansion valve based on the second deviation and a second PID algorithm, so that the evaporating pressure reaches the preset pressure threshold, and controlling the indoor fan in the air conditioner to work at a preset rotating speed while the opening degree of the electronic expansion valve is controlled.

[0063] The preset pressure threshold value is used to represent a pressure value corresponding to safe operation of the evaporator, and the preset rotating speed is a minimum value of a rotating speed at which the outdoor fan is allowed to work. The preset pressure threshold value and the preset rotating speed can be set according to actual needs, and the specific values of the preset pressure threshold value and the preset rotating speed are not limited in the embodiment. The second PID algorithm is a second control parameter set that is set in advance based on the second working condition. The second control parameter set includes a second proportional parameter, a second integral parameter, and a second differential parameter, and the second control parameter set can be set according to actual needs. The second change rate interval is used to limit the change rate of the opening degree of the electronic expansion valve. Regardless of how large the opening degree determined based on the second PID algorithm is, the opening degree of the electronic expansion valve must be controlled within the second change rate interval. Since the air conditioner has poor stability in the second working condition, in order to ensure that the air conditioner can operate normally, the second change rate interval is set to be smaller than the first change rate interval, and the second change rate interval can be ≤1% / second. The first change rate interval can also be set according to actual needs.

[0064] In the second working condition, the physical characteristics of the air conditioner have changed fundamentally. Since the suction superheat degree signal itself will fluctuate sharply, if control is performed based on the suction superheat degree, the electronic expansion valve will be turned on and off frequently, which will exacerbate the shaking of the air conditioner and eventually trigger protection and shutdown. The evaporating pressure of the evaporator can more directly and stably reflect the survival state of the air conditioner. Therefore, the evaporating pressure of the evaporator is obtained to determine a second deviation between the evaporating pressure and the preset pressure threshold value. The second deviation is an input signal of the second PID algorithm, and the size and direction of the second deviation determine the strength and direction of the opening degree output by the second PID algorithm. The second deviation is input into the second PID algorithm, so that the second PID algorithm calculates the opening degree of the electronic expansion valve based on the second control parameter set. The opening degree of the electronic expansion valve obtained at the current moment is compared with the opening degree of the electronic expansion valve at the previous moment to obtain a change rate of the opening degree. If the change rate of the opening degree is within the second change rate interval, the obtained opening degree of the electronic expansion valve is directly used to control the electronic expansion valve. If the change rate of the opening degree exceeds the second change rate interval, the obtained opening degree of the electronic expansion valve is limited to a maximum opening degree based on the second change rate interval, so as to control the electronic expansion valve by using the maximum opening degree. In the second working condition, the outdoor fan in the air conditioner is controlled to work at the preset rotating speed while the opening degree of the electronic expansion valve is controlled. In this way, in the second working condition, the embodiment realizes slow adjustment of the opening degree of the electronic expansion valve by monitoring the deviation between the evaporating pressure and the preset pressure threshold value in real time and calculating by using the second PID algorithm, avoids triggering protection and shutdown due to too low evaporating pressure, and improves user experience and prolongs the service life of the compressor.

[0065] In the embodiment, when the target control strategy is the third control strategy, the opening degree of the electronic expansion valve can be controlled in the following manner, comprising: determining the first target opening degree corresponding to the electronic expansion valve based on the coil temperature; controlling the opening degree of the electronic expansion valve to the first target opening degree, and simultaneously controlling the operation mode to switch from the heating mode to the cooling mode and controlling the outdoor fan in the air conditioner to stop working.

[0066] Wherein, a plurality of corresponding relationships between the coil temperature and the opening degree can be set in advance, after the coil temperature is obtained, the corresponding relationship is queried to obtain the opening degree from the corresponding relationship, and the obtained opening degree is determined as the first target opening degree corresponding to the electronic expansion valve, which is the best opening degree that can realize efficient defrosting of the air conditioner. In order to realize rapid defrosting of the air conditioner, the operation mode of the air conditioner is controlled to switch from the heating mode to the cooling mode, and the outdoor fan in the air conditioner is controlled to stop working. Through the above manner, the first target opening degree corresponding to the electronic expansion valve is determined based on the corresponding relationship between the coil temperature and the opening degree of the electronic expansion valve, the opening degree of the electronic expansion valve is controlled based on the first target opening degree, and the operation mode and the outdoor fan are controlled, so that the maximum possible heat is injected to the outdoor coil in the shortest time to melt the frost layer, avoiding the problem of prolonging the defrosting time caused by the control of the opening degree by the traditional PID algorithm, and improving the user experience.

[0067] In the embodiment, the air conditioner operation information further includes the dew point temperature of the air conditioner. The dew point temperature is the temperature at which water vapor begins to condense into dew under the indoor environmental temperature and the indoor environmental humidity, which is the physical threshold of dehumidification. The dew point temperature can be determined according to the prior art, and the determination method of the dew point temperature in the embodiment is not described herein. When the target control strategy is the fourth control strategy, the opening degree of the electronic expansion valve can be controlled in the following manner, comprising: determining the second superheat degree threshold corresponding to the compressor in the fourth working condition based on the dew point temperature, and determining the third deviation between the suction superheat degree and the second superheat degree threshold; controlling the opening degree of the electronic expansion valve in the third variation rate interval corresponding to the electronic expansion valve based on the third deviation and the third PID algorithm, so that the evaporation temperature is less than the dew point temperature, and simultaneously controlling the rotation speed of the outdoor fan in the air conditioner to be reduced.

[0068] The second superheat threshold is dynamically calculated based on the dew point temperature, and a corresponding relationship between the dew point temperature and the superheat threshold can be preset, and the second superheat threshold can be obtained by querying the corresponding relationship based on the dew point temperature. The third PID algorithm is a third control parameter set preset based on the fourth working condition, and the third control parameter set includes a third proportional parameter, a third integral parameter and a third differential parameter. The third control parameter set can be set according to actual needs. The third change rate interval is used to limit the change rate of the opening degree of the electronic expansion valve. No matter how large the opening degree determined based on the third PID algorithm is, the opening degree of the electronic expansion valve must be controlled within the third change rate interval. In order to achieve fast response in dynamic change and quickly meet the comfort demand, the third change rate interval is greater than the first change rate interval, and the third change rate interval can be ≤7% / second. The third change rate interval can also be set according to actual needs.

[0069] It should be noted that the second superheat threshold can also be determined in the following way: A preset humidity threshold corresponding to the indoor environment is obtained. A fifth deviation between the environmental humidity and the preset humidity threshold is determined. Based on the dew point temperature, the fifth deviation and the second fuzzy control algorithm, a second superheat threshold corresponding to the compressor in the fourth working condition is determined.

[0070] In the above, the preset humidity threshold is used to represent the optimal humidity of the indoor environment. The fifth deviation is obtained by subtracting the preset humidity threshold from the environmental humidity. After obtaining the fifth deviation and the dew point temperature, the fifth deviation and the dew point temperature are input into the second fuzzy control algorithm, so that the second fuzzy control algorithm determines the second superheat threshold based on the built-in fuzzy rule base. Since the dew point temperature (i.e. how much to dehumidify) and the fifth deviation (i.e. how much to dehumidify) are considered, the precise matching of dehumidification demand and dehumidification capacity is achieved, and the energy efficiency of the air conditioner is improved.

[0071] After the suction superheat degree is obtained, the suction superheat degree is subtracted from the second superheat degree threshold value, and a third deviation is obtained, which is an input signal of the third PID algorithm. The size and direction of the third deviation determine the strength and direction of the opening degree output by the third PID algorithm. The third deviation is input into the third PID algorithm, so that the third PID algorithm calculates the third deviation based on the third control parameter set to obtain the opening degree of the electronic expansion valve. The current obtained opening degree of the electronic expansion valve is compared with the opening degree of the electronic expansion valve at the last time to obtain the opening change rate. If the opening change rate is within the third change rate interval, the obtained opening degree of the electronic expansion valve is directly used to control the electronic expansion valve. If the opening change rate exceeds the third change rate interval, the obtained opening degree of the electronic expansion valve is limited to the maximum opening degree based on the third change rate interval, so as to control the electronic expansion valve by using the maximum opening degree. Moreover, the speed of the indoor fan in the air conditioner is controlled to reduce the speed, so as to improve the condensing efficiency and realize dehumidification faster. Through the above mode, in the fourth working condition, the second superheat degree threshold value is dynamically determined to perceive the strength of the dehumidification demand, the deviation between the suction superheat degree and the dynamically determined second superheat degree threshold value is monitored in real time, and the third PID algorithm is used for calculation, so as to realize rapid and stable control of the opening degree of the electronic expansion valve in the fourth working condition, realize rapid on-demand dehumidification, and improve the user experience.

[0072] In the embodiment, when the target control strategy is the fifth control strategy, the opening degree of the electronic expansion valve can be controlled by the following mode, which includes: determining a compensation opening degree corresponding to the electronic expansion valve based on the change rate of the operating frequency, and determining a fourth deviation between the suction superheat degree and a third superheat degree threshold value corresponding to the compressor in the fifth working condition; determining a second target opening degree corresponding to the electronic expansion valve within a fourth change rate interval corresponding to the opening degree of the electronic expansion valve based on the fourth deviation and the first fuzzy control algorithm; controlling the opening degree of the electronic expansion valve based on the compensation opening degree and the second target opening degree, and controlling the speed of the indoor fan in the air conditioner to increase at the same time.

[0073] The third superheat degree threshold value is used to represent the optimal suction superheat degree expected to be maintained by the compressor in the fifth working condition, and the third superheat degree threshold value can be set according to actual needs. For example, the third superheat degree can be 5K.

[0074] Due to the traditional PID algorithm control, if a fast response is required, a high gain parameter needs to be used, but this can easily lead to overshoot and oscillation when the air conditioner approaches the target. If a stable and no overshoot is required, a conservative parameter needs to be used, but this can also lead to slow response. Therefore, in order to solve the above problems, after obtaining the change rate of the operating frequency, the corresponding relationship between the change rate of the operating frequency and the opening degree of the electronic expansion valve is queried based on the pre-set corresponding relationship, so as to obtain the corresponding compensation opening degree of the electronic expansion valve. And after obtaining the suction superheat degree, the fourth deviation can be obtained by subtracting the third superheat threshold from the suction superheat degree. The fourth deviation is used as the input of the first fuzzy control algorithm, so that the first fuzzy control algorithm determines a second target opening degree aiming to eliminate the deviation in the fourth change rate interval based on the built-in fuzzy rule base. Since the fifth working condition requires a fast response, the fourth change rate interval is greater than the third change rate interval, and the fourth change rate interval can be ≤8%. After obtaining the compensation opening degree and the second target opening degree, the opening degree of the electronic expansion valve can be obtained by adding the compensation opening degree and the second target opening degree, so as to control the electronic expansion valve based on the determined opening degree of the electronic expansion valve. It should be noted that in order to further improve the rapidity and stability of the response, the speed of the indoor fan is increased. Through the above method, in the fifth working condition, in order to achieve a fast response, the main disturbance is offset by feedforward compensation, and the stability of the response is realized by combining the first fuzzy control algorithm, thereby avoiding the temperature overshoot and oscillation problem in the fifth working condition, and ensuring the efficient and stable operation of the air conditioner.

[0075] In the embodiment, when the target control strategy is the sixth control strategy, the opening degree of the electronic expansion valve can be controlled in the following manner: Based on the preset opening degree of the electronic expansion valve corresponding to the sixth working condition, the opening degree of the electronic expansion valve is controlled.

[0076] The preset opening degree is a preset opening degree of the electronic expansion valve corresponding to the sixth working condition, which can be set according to actual needs, and the specific value of the preset opening degree is not limited in the embodiment. In the sixth working condition, the opening degree of the electronic expansion valve is directly controlled to the preset opening degree to ensure the safe and reliable operation of the air conditioner.

[0077] The control method of the electronic expansion valve provided in the embodiment comprises the following steps: setting a preset working condition set associated with an air conditioner and a preset control strategy set associated with the opening degree of an electronic expansion valve in the air conditioner in advance; acquiring air conditioner running information of the air conditioner during air conditioner running; matching a target working condition corresponding to the air conditioner from the preset working condition set by using the air conditioner running information; matching a target control strategy from the preset control strategy set by using the target working condition; and controlling the opening degree of the electronic expansion valve by using the target control strategy, so that the opening degree of the electronic expansion valve meets the dynamic working condition of the air conditioner, thereby avoiding the disadvantages of controlling the opening degree of the electronic expansion valve by using a single parameter and ensuring efficient and stable operation of the air conditioner.

[0078] Reference Figure 3 , Figure 3 The control device of the electronic expansion valve provided in the embodiment is shown in the structural schematic diagram. The control device of the electronic expansion valve provided in the embodiment comprises an acquisition module 10, a determination module 20 and a control module 30. The acquisition module 10 is configured to acquire air conditioner running information corresponding to the air conditioner. The determination module 20 is configured to determine a target working condition corresponding to the air conditioner from a preset working condition set based on the air conditioner running information. The determination module 20 is further configured to determine a target control strategy corresponding to the air conditioner from a preset control strategy set based on the target working condition. Each preset control strategy in the preset control strategy set is used to indicate a control strategy of the opening degree of the electronic expansion valve in the air conditioner under a preset working condition, and the preset working condition belongs to the preset working condition set. The control module 30 is configured to control the opening degree of the electronic expansion valve based on the target control strategy.

[0079] In the embodiment, the air conditioner running information comprises suction superheat of a compressor in the air conditioner, environmental humidity of an indoor environment where the air conditioner is located, a running mode of the air conditioner, a running frequency of the compressor and coil temperature of an outdoor coil in the air conditioner.

[0080] In the embodiment, the determination module 20 is further configured to: match the air conditioner running information with each preset trigger condition in a preset trigger condition set to determine a matched target trigger condition from the preset trigger condition set; determine the target working condition corresponding to the air conditioner from the preset working condition set based on the target trigger condition; ​The preset trigger condition set includes the following preset trigger conditions: the duration that the suction superheat degree is in a preset superheat degree interval reaches a first preset duration; the running frequency is less than a preset frequency threshold and the fluctuation amplitude of the suction superheat degree is greater than a preset fluctuation threshold; the running mode is a heating mode and the duration that the coil temperature is less than a preset temperature threshold reaches a second preset duration; the running mode is a refrigerating mode and the ambient humidity is greater than a preset humidity threshold; and the change rate of the running frequency is greater than a preset change rate threshold.

[0081] In this embodiment, when the target trigger condition includes that the duration that the suction superheat degree is in a preset superheat degree interval reaches a first preset duration, the target working condition is a first working condition, and the target control strategy corresponding to the first working condition is a first control strategy; the control module 30 is further configured to: determine a first deviation between the suction superheat degree and a first superheat degree threshold corresponding to the compressor in the first working condition when the target control strategy is the first control strategy; control the opening degree of the electronic expansion valve in a first change rate interval corresponding to the opening degree of the electronic expansion valve based on the first deviation and a first PID algorithm, so that the suction superheat degree reaches the first superheat degree threshold.

[0082] In this embodiment, the air conditioner running information further includes: an evaporator pressure of the evaporator in the air conditioner; when the target trigger condition includes that the running frequency is less than a preset frequency threshold and the fluctuation amplitude of the suction superheat degree is greater than a preset fluctuation threshold, the target working condition is a second working condition, and the target control strategy corresponding to the second working condition is a second control strategy; the control module 30 is further configured to: determine a second deviation between the evaporator pressure and a preset pressure threshold corresponding to the evaporator in the second working condition when the target control strategy is the second control strategy; control the opening degree of the electronic expansion valve in a second change rate interval corresponding to the opening degree of the electronic expansion valve based on the second deviation and a second PID algorithm, so that the evaporator pressure reaches the preset pressure threshold, and control an indoor fan in the air conditioner to work at a preset rotating speed while controlling the opening degree of the electronic expansion valve, the preset rotating speed being used to represent a minimum value of the rotating speed allowed for the indoor fan to work.

[0083] In this embodiment, when the target trigger condition includes that the running mode is a heating mode and the duration that the coil temperature is less than a preset temperature threshold reaches a second preset duration, the target working condition is a third working condition, and the target control strategy corresponding to the third working condition is a third control strategy; the control module 30 is further configured to: determining a first target opening degree of the electronic expansion valve corresponding to the electronic expansion valve based on the temperature of the coil when the target control strategy is the third control strategy; controlling the opening degree of the electronic expansion valve to the first target opening degree, and controlling the operation mode to switch from the heating mode to the cooling mode and controlling the outdoor fan in the air conditioner to stop working while the opening degree of the electronic expansion valve is controlled.

[0084] In this embodiment, the air conditioner operation information further includes a dew point temperature of the air conditioner, and when the target trigger condition includes that the operation mode is the cooling mode and the ambient humidity is greater than a preset humidity threshold, the target working condition is a fourth working condition, and the target control strategy corresponding to the fourth working condition is a fourth control strategy; the control module 30 is further configured to: determining a second superheat threshold corresponding to the compressor in the fourth working condition based on the dew point temperature when the target control strategy is the fourth control strategy, and determining a third deviation between the suction superheat and the second superheat threshold; controlling the opening degree of the electronic expansion valve in a third variation rate interval corresponding to the opening degree of the electronic expansion valve based on the third deviation and a third PID algorithm, so that the suction superheat reaches the second superheat threshold, and controlling the speed of the indoor fan in the air conditioner to be reduced while the opening degree of the electronic expansion valve is controlled.

[0085] In this embodiment, when the target trigger condition includes that the variation rate of the operation frequency is greater than a preset variation rate threshold, the target working condition is a fifth working condition, and the target control strategy corresponding to the fifth working condition is a fifth control strategy; the control module 30 is further configured to: determining a compensation opening degree of the electronic expansion valve based on the variation rate of the operation frequency when the target control strategy is the fifth control strategy, and determining a fourth deviation between the suction superheat and a third superheat threshold corresponding to the compressor in the fifth working condition; determining a second target opening degree of the electronic expansion valve in a fourth variation rate interval corresponding to the opening degree of the electronic expansion valve based on the fourth deviation and a first fuzzy control algorithm; controlling the opening degree of the electronic expansion valve based on the compensation opening degree and the second target opening degree, and controlling the speed of the indoor fan in the air conditioner to be increased while the opening degree of the electronic expansion valve is controlled.

[0086] In this embodiment, the set of preset trigger conditions further includes a preset trigger condition that the suction superheat is less than a fourth superheat threshold, and the fourth superheat threshold is used to represent the minimum value of the suction superheat of the compressor; the determination module 20 is further configured to: When the target trigger condition is multiple and there is a first target trigger condition in the multiple target trigger conditions, the target working condition corresponding to the air conditioner is determined from the preset working condition set based on the first target trigger condition; wherein the target working condition is a sixth working condition, the target control strategy corresponding to the sixth working condition is a sixth control strategy, and the first target trigger condition includes that the suction gas superheat is less than a fourth superheat threshold.

[0087] The control module 30 is further configured to: When the target control strategy is the sixth control strategy, the opening degree of the electronic expansion valve is controlled based on the preset opening degree of the electronic expansion valve in the sixth working condition.

[0088] The control device of the electronic expansion valve provided in the embodiment sets the preset working condition set associated with the air conditioner and the preset control strategy set associated with the opening degree of the electronic expansion valve in the air conditioner in advance, so as to acquire the air conditioner running information of the air conditioner in the running process of the air conditioner, to match the target working condition corresponding to the air conditioner from the preset working condition set by using the air conditioner running information, to match the target control strategy from the preset control strategy by using the target working condition, and to control the opening degree of the electronic expansion valve by using the target control strategy, so that the opening degree of the electronic expansion valve meets the dynamic working condition of the air conditioner, to avoid the disadvantages of controlling the opening degree of the electronic expansion valve by using a single parameter, and to ensure the efficient and stable running of the air conditioner.

[0089] Figure 4 A structural schematic diagram of an air conditioner is provided for the embodiments of the present application, Figure 4 The air conditioner 400 shown includes at least one processor 401, a memory 402, at least one network interface 404, and other user interfaces 403. The various components in the air conditioner 400 are coupled together by a bus system 405. It can be understood that the bus system 405 is used to realize the connection and communication between the components. In addition to the data bus, the bus system 405 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, all the buses are marked as the bus system 405 in the Figure 4

[0090] The user interface 403 can include a display, a keyboard, or a clicking device (for example, a mouse, a trackball, a touchpad, or a touch screen, etc.).

[0091] ​It is to be appreciated that the memory 402 in the embodiments of the present application can be a volatile memory or a nonvolatile memory, or can include both volatile and nonvolatile memory. Among them, the nonvolatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM) used as an external cache. By way of example, and not limitation, many forms of RAM can be used, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 402 described herein is intended to include, without being limited to, these and any other suitable types of memory.

[0092] In some embodiments, the memory 402 stores the following elements, executable units or data structures, or a subset of them, or an extended set of them: an operating system 4021 and application programs 4022.

[0093] Among them, the operating system 4021 contains various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application programs 4022 contain various application programs, such as a Media Player, a Browser, etc., for implementing various application services. The programs for implementing the method embodiments of the present application can be contained in the application programs 4022.

[0094] In the embodiments of the present application, the processor 401 is used to execute the method steps provided by each method embodiment by invoking the programs or instructions stored in the memory 402, specifically, the programs or instructions stored in the application programs 4022.

[0095] The method disclosed by the embodiments of the present application can be applied to the processor 401 or implemented by the processor 401. The processor 401 can be an integrated circuit chip having a signal processing capability. In the implementation process, each step of the above method can be completed by an integrated logic circuit or an instruction in the form of software of the hardware in the processor 401. The processor 401 described above can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. Each method, step and logic block diagram disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software units in the code processor for execution. The software unit can be located in a random memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory 402, and the processor 401 reads the information in the memory 402 and combines the hardware to complete the steps of the above method.

[0096] It can be understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described in the present application, or a combination thereof.

[0097] For software implementation, the techniques described herein can be implemented with a unit that performs the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

[0098] The air conditioner provided by the embodiments can be as followsFigure 4 The air conditioner shown in the present application can perform all the steps of the control method of the electronic expansion valve as shown in Figure 1 and Figure 2 The control method of the electronic expansion valve as shown in Figure 1 and Figure 2 The technical effects of the control method of the electronic expansion valve as shown in Figure 1 and Figure 2 The relevant description is not repeated here for brevity.

[0099] The embodiment of the present application also provides a storage medium (computer readable storage medium). The storage medium stores one or more programs. The storage medium can include a volatile memory such as a random access memory, and the memory can also include a non-volatile memory such as a read-only memory, a flash memory, a hard disk or a solid state disk, and the memory can also include a combination of the above kinds of memories.

[0100] When the one or more programs in the storage medium can be executed by one or more processors to implement the control method of the electronic expansion valve described above on the control device side of the electronic expansion valve.

[0101] The skilled person should also further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0102] The steps of the method or algorithm described in combination with the embodiments disclosed herein can be implemented in hardware, software modules executed by a processor, or a combination of both. The software modules can be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0103] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A control method of an electronic expansion valve, characterized by, The method comprises: obtaining air conditioner running information corresponding to an air conditioner; determining a target working condition corresponding to the air conditioner from a preset working condition set based on the air conditioner running information; determining a target control strategy corresponding to the air conditioner from a preset control strategy set based on the target working condition, wherein each preset control strategy in the preset control strategy set is used to indicate a control strategy of an opening degree of an electronic expansion valve in the air conditioner under a preset working condition, and the preset working condition belongs to the preset working condition set; controlling the opening degree of the electronic expansion valve based on the target control strategy.

2. The method of claim 1, wherein, The air conditioner running information comprises: suction superheat of a compressor in the air conditioner, environmental humidity of an indoor environment in which the air conditioner is located, running mode of the air conditioner, running frequency of the compressor, and coil temperature of an outdoor coil in the air conditioner. The determining of the target control strategy from the preset control strategy set comprises: matching the air conditioner running information with each preset trigger condition in a preset trigger condition set to determine a matched target trigger condition from the preset trigger condition set; determining the target working condition corresponding to the air conditioner from the preset working condition set based on the target trigger condition; wherein the preset trigger condition set comprises the following preset trigger conditions: the suction superheat is in a preset superheat interval for a duration reaching a first preset duration; the running frequency is less than a preset frequency threshold value and a fluctuation amplitude of the suction superheat is greater than a preset fluctuation threshold value; the running mode is a heating mode and the coil temperature is less than a preset temperature threshold value for a duration reaching a second preset duration; the running mode is a cooling mode and the environmental humidity is greater than a preset humidity threshold value; a change rate of the running frequency is greater than a preset change rate threshold value.

3. The method of claim 2, wherein, When the target trigger condition comprises that the suction superheat is in a preset superheat interval for a duration reaching a first preset duration, the target working condition is a first working condition, and the target control strategy corresponding to the first working condition is a first control strategy. The controlling of the opening degree of the electronic expansion valve based on the target control strategy comprises: when the target control strategy is the first control strategy, determining a first deviation between the suction superheat and a first superheat threshold value corresponding to the compressor under the first working condition; controlling the opening degree of the electronic expansion valve in a first change rate interval corresponding to the opening degree of the electronic expansion valve based on the first deviation and a first PID algorithm, so that the suction superheat reaches the first superheat threshold value.

4. The method of claim 2, wherein, The air conditioner running information further comprises: evaporator pressure of an evaporator in the air conditioner; when the target trigger condition comprises that the running frequency is less than a preset frequency threshold value and a fluctuation amplitude of the suction superheat is greater than a preset fluctuation threshold value, the target working condition is a second working condition, and the target control strategy corresponding to the second working condition is a second control strategy; The controlling of the opening degree of the electronic expansion valve based on the target control strategy comprises: determining a second deviation between the evaporating pressure and a preset pressure threshold corresponding to the evaporator in the second working condition when the target control strategy is the second control strategy; controlling the opening degree of the electronic expansion valve in a second change rate interval corresponding to the opening degree of the electronic expansion valve based on the second deviation and a second PID algorithm, so that the evaporating pressure reaches the preset pressure threshold, and controlling the indoor fan in the air conditioner to operate at a preset rotating speed while controlling the opening degree of the electronic expansion valve, the preset rotating speed being used to represent a minimum value of the rotating speed allowing the indoor fan to operate.

5. The method of claim 2, wherein, when the target trigger condition includes that the operating mode is the heating mode and the duration that the coil temperature is less than the preset temperature threshold reaches a second preset duration, the target working condition is a third working condition, and the target control strategy corresponding to the third working condition is a third control strategy; the control of the opening degree of the electronic expansion valve based on the target control strategy comprises: when the target control strategy is the third control strategy, determining a first target opening degree corresponding to the electronic expansion valve based on the coil temperature; controlling the opening degree of the electronic expansion valve to the first target opening degree, and controlling the operating mode to switch from the heating mode to the cooling mode and controlling the outdoor fan in the air conditioner to stop operating while controlling the opening degree of the electronic expansion valve.

6. The method of claim 2, wherein, the air conditioner operating information further comprises a dew point temperature of the air conditioner, and when the target trigger condition includes that the operating mode is the cooling mode and the environmental humidity is greater than a preset humidity threshold, the target working condition is a fourth working condition, and the target control strategy corresponding to the fourth working condition is a fourth control strategy; the control of the opening degree of the electronic expansion valve based on the target control strategy comprises: when the target control strategy is the fourth control strategy, determining a second superheat threshold corresponding to the compressor in the fourth working condition based on the dew point temperature, and determining a third deviation between the suction superheat and the second superheat threshold; controlling the opening degree of the electronic expansion valve in a third change rate interval corresponding to the opening degree of the electronic expansion valve based on the third deviation and a third PID algorithm, so that the suction superheat reaches the second superheat threshold, and reducing the rotating speed of the indoor fan in the air conditioner while controlling the opening degree of the electronic expansion valve.

7. The method of claim 2, wherein, when the target trigger condition includes that the change rate of the operating frequency is greater than a preset change rate threshold, the target working condition is a fifth working condition, and the target control strategy corresponding to the fifth working condition is a fifth control strategy; the control of the opening degree of the electronic expansion valve based on the target control strategy comprises: when the target control strategy is the fifth control strategy, determining a compensation opening degree corresponding to the electronic expansion valve based on the change rate of the operating frequency, and determining a fourth deviation between the suction superheat and a third superheat threshold corresponding to the compressor in the fifth working condition; determine a second target opening degree of the electronic expansion valve in a fourth variation rate interval corresponding to the opening degree of the electronic expansion valve based on the fourth deviation and a first fuzzy control algorithm; control the opening degree of the electronic expansion valve based on the compensation opening degree and the second target opening degree, and control the rotation speed of the indoor fan in the air conditioner to be increased while the opening degree of the electronic expansion valve is controlled.

8. The method of claim 2, wherein, The set of preset trigger conditions further includes a preset trigger condition that the suction superheat degree is less than a fourth superheat threshold value, the fourth superheat threshold value being used to represent a minimum value of the suction superheat degree of the compressor; The determining, based on the target trigger condition, of the target working condition corresponding to the air conditioner from the set of preset working conditions comprises: When the target trigger condition is multiple and there is a first target trigger condition in the multiple target trigger conditions, determining, based on the first target trigger condition, the target working condition corresponding to the air conditioner from the set of preset working conditions; wherein the target working condition is a sixth working condition, the target control strategy corresponding to the sixth working condition is a sixth control strategy, and the first target trigger condition includes that the suction superheat degree is less than a fourth superheat threshold value; The controlling, based on the target control strategy, of the opening degree of the electronic expansion valve comprises: When the target control strategy is the sixth control strategy, controlling the opening degree of the electronic expansion valve based on a preset opening degree of the electronic expansion valve in the sixth working condition.

9. A control device for an electronic expansion valve, characterized by The method comprises: an acquisition module configured to acquire air conditioner running information corresponding to an air conditioner; a determination module configured to determine, based on the air conditioner running information, a target working condition corresponding to the air conditioner from a set of preset working conditions; The determination module is further configured to determine, based on the target working condition, a target control strategy corresponding to the air conditioner from a set of preset control strategies, each preset control strategy in the set of preset control strategies being used to indicate a control strategy of an opening degree of an electronic expansion valve in the air conditioner in a preset working condition, the preset working condition belonging to the set of preset working conditions; a control module configured to control the opening degree of the electronic expansion valve based on the target control strategy.

10. An air conditioner characterized by comprising: The method comprises: a processor and a memory, the processor being configured to execute a control program of an electronic expansion valve stored in the memory to implement the control method of the electronic expansion valve according to any one of claims 1 to 8.

11. A storage medium, characterized by The storage medium stores one or more programs, and the one or more programs are executable by one or more processors to implement the control method of the electronic expansion valve according to any one of claims 1 to 8.

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