Control method and device, air conditioning equipment, storage medium and electronic equipment

Abstract

The invention discloses a control method and device, air conditioning equipment, a storage medium and electronic equipment. The method is applied to the air conditioning equipment with an electronic expansion valve, and comprises the steps that when the exhaust temperature of a compressor is not in a first preset interval and the superheat degree parameter is not in a second preset interval, the compressor is started; the opening degree of an electronic expansion valve is adjusted according to the difference value between the superheat degree parameter and the target superheat degree, and then whether the electronic expansion valve is out of step or not is judged according to the change condition of the superheat degree parameter; after it is judged that the electronic expansion valve is out of step, a compressor is controlled to reduce frequency, and then the out-of-step type of the electronic expansion valve is determined according to the change condition of the superheat degree parameter; and executing a corresponding regulation and control strategy according to the out-of-step type of the electronic expansion valve. By means of the method and device, the out-of-step condition of the electronic expansion valve can be found timely and accurately, the out-of-step problem of the electronic expansion valve is solved in a targeted mode, and the heat exchange effect of air conditioning equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method, a device, air conditioning equipment, a storage medium and an electronic device. Background Art

[0002] The electronic expansion valve is an important component in air conditioning equipment, and its function is to adjust the flow rate of the refrigerant. Existing air conditioning equipment generally obtains temperature parameters and adjusts the opening of the electronic expansion valve based on the temperature parameters to adjust the heat exchange effect. However, if the electronic expansion valve is out of step, the heat exchange effect cannot be adjusted. In the existing technology, it is impossible to effectively detect the out-of-step of the electronic expansion valve, and thus it is impossible to adjust the control strategy according to the out-of-step situation, resulting in the problem that the heat exchange of the air conditioning equipment does not match the actual working conditions.

[0003] Currently, no effective solution has been proposed to solve the problem that the air-conditioning equipment in the prior art cannot adjust the control strategy according to the out-of-step situation, resulting in the heat exchange of the air-conditioning equipment not matching the actual working conditions. Summary of the invention

[0004] A control method, device, air conditioning equipment, storage medium and electronic device are provided in the embodiments of the present invention to solve the problem in the prior art that the air conditioning equipment cannot adjust the control strategy according to the out-of-step situation, resulting in the heat exchange of the air conditioning equipment not matching the actual working conditions.

[0005] In order to solve the above technical problems, the present invention provides a control method, which is applied to an air-conditioning device with an electronic expansion valve, and the method comprises:

[0006] When the exhaust temperature of the compressor is not in the first preset range and the superheat parameter is not in the second preset range, the air conditioning device is controlled to enter out-of-step detection: the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, and then whether the electronic expansion valve is out of step is determined according to the change of the superheat parameter;

[0007] After determining that the electronic expansion valve is out of step, controlling the compressor to reduce frequency, and then determining the out of step type of the electronic expansion valve according to the change of the superheat parameter;

[0008] The corresponding control strategy is executed according to the type of loss of step of the electronic expansion valve.

[0009] Further, judging whether the electronic expansion valve is out of step according to the change of the superheat parameter includes:

[0010] determining whether the superheat parameter is within a second preset range;

[0011] If yes, it is determined that the electronic expansion valve is not out of step, and the out-of-step detection is exited;

[0012] If not, determine whether the time for entering the out-of-step detection exceeds the first preset time; if yes, determine that the electronic expansion valve is out of step; if not, continue to adjust the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat.

[0013] Further, the compressor is controlled to reduce frequency, and then the out-of-step type of the electronic expansion valve is determined according to the change of the superheat parameter, including:

[0014] determining whether the superheat parameter is within a second preset range;

[0015] If yes, it is determined that the out-of-step type of the electronic expansion valve is high-pressure out-of-step;

[0016] If not, determine whether the frequency reduction duration of the compressor exceeds a second preset duration; if yes, determine that the out-of-step type of the electronic expansion valve is complete out-of-step; if not, continue to control the compressor to reduce frequency until the superheat parameter is in the second preset interval or the frequency reduction duration exceeds the second preset duration.

[0017] Furthermore, a corresponding control strategy is executed according to the out-of-step type of the electronic expansion valve, including:

[0018] If the out-of-step type of the electronic expansion valve is high-pressure out-of-step, adjusting the frequency of the compressor according to the high-pressure pressure;

[0019] If the out-of-step type of the electronic expansion valve is complete out-of-step, the frequency reduction temperature threshold is controlled to be lowered, and then the compressor is controlled to reduce the frequency according to the exhaust temperature and the frequency reduction temperature threshold.

[0020] Further, adjusting the frequency of the compressor according to the high pressure includes:

[0021] Determining the interval in which the high pressure is located;

[0022] If the high pressure is greater than or equal to a first pressure threshold, controlling the compressor to reduce frequency;

[0023] If the high pressure is greater than or equal to the second pressure threshold and less than the first pressure threshold, the compressor is controlled to maintain the current frequency;

[0024] If the high pressure is less than the second pressure threshold, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air conditioning device.

[0025] Furthermore, while controlling the compressor to maintain a current frequency or adjusting the frequency of the compressor according to the outlet water temperature or the inlet water temperature of the air conditioning device, the method further includes:

[0026] The opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat.

[0027] Further, controlling the compressor frequency reduction according to the exhaust temperature and the frequency reduction temperature threshold includes:

[0028] Determining whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold;

[0029] If yes, the compressor is controlled to reduce frequency, and then a trigger is triggered to determine whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold;

[0030] If not, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning device, and then a trigger is triggered to determine whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold.

[0031] Further, in the cooling mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning device, including: judging the magnitude relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is greater than the corresponding target temperature, controlling the compressor to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, controlling the compressor to maintain the current frequency; if the outlet water temperature or the inlet water temperature is less than the corresponding target temperature, controlling the compressor to reduce the frequency;

[0032] In the heating mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, including: judging the relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is lower than the corresponding target temperature, controlling the compressor to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, controlling the compressor to maintain the current frequency; if the outlet water temperature or the inlet water temperature is higher than the corresponding target temperature, controlling the compressor to reduce the frequency.

[0033] Further, in the cooling mode, the superheat parameter is the suction superheat, and adjusting the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat includes:

[0034] determining a range of a difference between the suction air superheat and the target suction air superheat;

[0035] If the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase;

[0036] If the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged;

[0037] If the difference is less than 0, the opening degree of the electronic expansion valve is controlled to decrease.

[0038] Further, in the heating mode, the superheat parameter is the exhaust superheat, and adjusting the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat includes:

[0039] determining a range of a difference between the exhaust superheat and the target exhaust superheat;

[0040] If the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase;

[0041] If the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged;

[0042] If the difference is less than 0, the opening degree of the electronic expansion valve is controlled to decrease.

[0043] The present invention also provides a control device for implementing the above control method, characterized in that the device comprises:

[0044] The first detection module is used to control the air-conditioning device to enter out-of-step detection when the exhaust temperature of the compressor is not in the first preset range and the superheat parameter is not in the second preset range: adjusting the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat, and then judging whether the electronic expansion valve is out of step according to the change of the superheat parameter;

[0045] A second detection module is used to control the compressor to reduce the frequency after determining that the electronic expansion valve is out of step, and then determine the out-of-step type of the electronic expansion valve according to the change of the superheat parameter;

[0046] The control module is used to execute corresponding control strategies according to the out-of-step type of the electronic expansion valve.

[0047] The present invention also provides an air conditioning device, comprising an electronic expansion valve and a variable frequency compressor, and also comprising the above-mentioned control device.

[0048] The present invention also provides a computer-readable storage medium on which a computer program is stored, and the program implements the above control method when executed by a processor.

[0049] The present invention also provides an electronic device, comprising:

[0050] one or more processors;

[0051] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned control method.

[0052] By applying the technical solution of the present invention, when the exhaust temperature of the compressor is not in the first preset interval and the superheat parameter is not in the second preset interval, the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, and then it is judged whether the electronic expansion valve is out of step according to the change of the superheat parameter. The out-of-step situation of the electronic expansion valve can be discovered in a timely and accurate manner. After determining that the electronic expansion valve is out of step, the compressor is controlled to reduce the frequency, and then the out-of-step type of the electronic expansion valve is determined according to the change of the superheat parameter. According to the out-of-step type of the electronic expansion valve, a corresponding control strategy is executed, which can achieve a targeted solution to the out-of-step problem of the electronic expansion valve, thereby achieving accurate adjustment of the heat exchange amount of the air-conditioning equipment according to the actual working conditions, and ensuring the heat exchange effect of the air-conditioning equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a flow chart of a control method according to an embodiment of the present invention;

[0054] Figure 2 is a flow chart of a control method according to another embodiment of the present invention;

[0055] Figure 3 is a flowchart of a process for determining whether to enter out-of-step detection according to an embodiment of the present invention;

[0056] Figure 4 is a flow chart of a desynchronization detection process according to an embodiment of the present invention;

[0057] Figure 5 is a flow chart of a process for determining the type of out-of-step according to an embodiment of the present invention;

[0058] Figure 6 is a flow chart of a complete out-of-step control process according to an embodiment of the present invention;

[0059] Figure 7 is a flow chart of a control process of high voltage out-of-step according to an embodiment of the present invention;

[0060] Figure 8 is a structural block diagram of a control device according to an embodiment of the present invention;

[0061] Fig. 9 is a structural block diagram of an air conditioning device according to an embodiment of the present invention;

[0062] Fig.10 FIG. 4 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0065] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] It should be understood that, although the terms first, second, third, etc. may be used to describe the preset durations in the embodiments of the present invention, these preset durations should not be limited to these terms. These terms are only used to distinguish different preset durations. For example, without departing from the scope of the embodiments of the present invention, the second preset duration may also be referred to as the second preset duration, and similarly, the second preset duration may also be referred to as the second preset duration.

[0067] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0068] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0069] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0070] Example 1

[0071] The electronic expansion valve is an important component in air conditioning equipment, and its function is to adjust the flow rate of the refrigerant. Existing air conditioning equipment generally obtains temperature parameters and adjusts the opening of the electronic expansion valve based on the temperature parameters to adjust the heat exchange effect. However, if the electronic expansion valve is out of step, the heat exchange effect cannot be adjusted. In the existing technology, it is impossible to effectively detect the out-of-step of the electronic expansion valve, and thus it is impossible to adjust the control strategy according to the out-of-step situation, resulting in the problem that the heat exchange of the air conditioning equipment does not match the actual working conditions.

[0072] In view of the problem in the prior art that the air-conditioning equipment cannot adjust the control strategy for the out-of-step situation, resulting in the heat exchange of the air-conditioning equipment not matching the actual working conditions, this embodiment provides a control method applied to the air-conditioning equipment with an electronic expansion valve. Figure 1 is a flow chart of a control method according to an embodiment of the present invention, as shown in Figure 1 As shown, the control method includes:

[0073] S101, when the exhaust temperature of the compressor is not in the first preset range and the superheat parameter is not in the second preset range, the air-conditioning equipment is controlled to enter out-of-step detection: the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, and then whether the electronic expansion valve is out of step is determined according to the change of the superheat parameter.

[0074] When the electronic expansion valve works normally, the exhaust temperature and superheat parameters of the compressor will fluctuate within a relatively fixed range. If the electronic expansion valve is out of step, that is, it cannot be opened or closed normally, then the exhaust temperature and superheat parameters will fluctuate greatly, exceeding the normal range. Therefore, when the exhaust temperature of the compressor is not in the first preset interval and the superheat parameter is not in the second preset interval, it indicates that the electronic expansion valve may have a problem of losing step. In order to determine whether the electronic expansion valve has really lost step, the air conditioning device is controlled to enter the out-of-step detection. The upper limit of the first preset interval can be the target exhaust temperature floating up by the first preset temperature, and the lower limit of the first preset interval can be the target exhaust temperature floating down by the first preset temperature; the upper limit of the second preset interval can be the target superheat parameter floating up by the second preset temperature, and the lower limit of the second preset interval can be the target superheat parameter floating down by the second preset temperature. In order to avoid accidental factors, after the superheat parameter is not in the second preset interval for a period of time exceeding the third preset period, the air conditioning device is controlled to enter the out-of-step detection.

[0075] If the electronic expansion valve has not lost step, then the difference between the superheat parameter and the corresponding target superheat will adjust the opening of the electronic expansion valve according to the correct trend, and the superheat parameter will be closer to the target superheat and finally fall into the second preset interval. However, if the electronic expansion valve has lost step and the opening adjustment fails, then no matter how the opening of the electronic expansion valve is adjusted, the superheat parameter will not fall into the second preset interval. Therefore, in order to determine whether the electronic expansion valve has really lost step, the opening of the electronic expansion valve is first adjusted according to the difference between the superheat parameter and the corresponding target superheat. If the superheat parameter falls into the second preset interval after the opening is adjusted, it means that the opening adjustment of the electronic expansion valve is effective and the electronic expansion valve has not lost step; if the superheat parameter does not fall into the second preset interval after the opening is adjusted, it means that the opening adjustment of the electronic expansion valve is invalid and the electronic expansion valve has lost step.

[0076] S103, after determining that the electronic expansion valve is out of step, controlling the compressor to reduce the frequency, and then determining the out of step type of the electronic expansion valve according to the change of the superheat parameter.

[0077] After determining that the electronic expansion valve is out of step, it is necessary to determine the specific type of out of step. The out of step of the electronic expansion valve may be caused by excessive high pressure, which is called high-pressure out of step; the out of step of the electronic expansion valve may be caused by damage to the device itself, which is called complete out of step.

[0078] S104: Execute a corresponding control strategy according to the type of out-of-step of the electronic expansion valve.

[0079] For high-pressure out-of-step, the problem can be solved by reducing the high-pressure pressure (i.e., the exhaust pressure of the compressor), while for complete out-of-step, the opening of the electronic expansion valve cannot be adjusted, and the heat exchange amount can only be changed by adjusting the compressor frequency, etc. It can be seen that the corresponding control strategy needs to be implemented according to the out-of-step type of the electronic expansion valve.

[0080] The control method of this embodiment adjusts the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat when the exhaust temperature of the compressor is not in the first preset interval and the superheat parameter is not in the second preset interval, and then determines whether the electronic expansion valve is out of step according to the change of the superheat parameter. The control method can timely and accurately detect the loss of step of the electronic expansion valve. After determining that the electronic expansion valve is out of step, the compressor is controlled to reduce the frequency, and then the loss of step type of the electronic expansion valve is determined according to the change of the superheat parameter. According to the loss of step type of the electronic expansion valve, a corresponding control strategy is executed, which can achieve a targeted solution to the loss of step problem of the electronic expansion valve, thereby achieving accurate adjustment of the heat exchange amount of the air-conditioning equipment according to the actual working conditions, and ensuring the heat exchange effect of the air-conditioning equipment.

[0081] According to the foregoing, if the electronic expansion valve is out of step and the opening adjustment fails, then no matter how the opening of the electronic expansion valve is adjusted, the superheat parameter will not fall into the second preset interval. However, if the number of steps for adjusting the electronic expansion valve at one time is adjusted too small, the superheat parameter may not fall into the second preset interval, and the change of the superheat parameter lags behind the step adjustment of the electronic expansion valve. Therefore, in order to improve the accuracy of the judgment result, the step adjustment of the electronic expansion valve needs to be maintained for a period of time. If the superheat parameter is still not adjusted to the second preset interval after this period of time, it can be said that a loss of step has occurred. Therefore, judging whether the electronic expansion valve is out of step according to the change of the superheat parameter includes: judging whether the superheat parameter is in the second preset interval; if so, judging that the electronic expansion valve is not out of step and exiting the out-of-step detection; if not, judging whether the time for entering the out-of-step detection exceeds the first preset time; if so, judging that the electronic expansion valve is out of step; if not, continuing to adjust the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat.

[0082] High-pressure out-of-step can be solved by reducing the high-pressure pressure, and controlling the compressor to reduce the frequency will cause the high-pressure pressure to decrease, which can effectively solve the high-pressure out-of-step. Therefore, after controlling the compressor to reduce the frequency, the out-of-step type of the electronic expansion valve is determined according to the change of the superheat parameter, including: judging whether the superheat parameter is in the second preset interval; if so, it indicates that the electronic expansion valve out-of-step can be solved by controlling the compressor to reduce the frequency, and determining that the out-of-step type of the electronic expansion valve is high-pressure out-of-step; if not, judging whether the compressor reduction time exceeds the second preset time; if so, it indicates that the electronic expansion valve out-of-step cannot be solved by controlling the compressor to reduce the frequency, and judging that the electronic expansion valve out-of-step type is complete out-of-step; if not, it may be that the frequency reduction time is insufficient and the high-pressure pressure is still high, resulting in the inability to solve the out-of-step problem. Therefore, continue to control the compressor to reduce the frequency until the superheat parameter is in the second preset interval or the frequency reduction time exceeds the second preset time.

[0083] In order to achieve targeted solutions according to the characteristics of different out-of-step types, corresponding control strategies are implemented according to the out-of-step type of the electronic expansion valve, including: if the out-of-step type of the electronic expansion valve is high-pressure out-of-step, the frequency of the compressor is adjusted according to the high-pressure pressure; if the out-of-step type of the electronic expansion valve is complete out-of-step, the frequency reduction temperature threshold is controlled to be lowered, and then the compressor frequency is controlled to be reduced according to the exhaust temperature and the frequency reduction temperature threshold.

[0084] The higher the high pressure, the more the compressor frequency needs to be lowered. Therefore, the frequency of the compressor is adjusted according to the high pressure, including: determining the interval in which the high pressure is located; if the high pressure is greater than or equal to the first pressure threshold, the compressor is controlled to reduce the frequency; if the high pressure is greater than or equal to the second pressure threshold, and less than the first pressure threshold, the compressor is controlled to maintain the current frequency; if the high pressure is less than the second pressure threshold, it indicates that the high pressure has been reduced to a reasonable level, and the frequency of the compressor can be adjusted according to the outlet water temperature or inlet water temperature of the air-conditioning equipment. Among them, the first pressure threshold is the high pressure pressure value corresponding to the superheat parameter entering the second preset interval when the electronic expansion valve has a high pressure out of step when judging the out-of-step type in the past, and the second pressure threshold is the first pressure threshold minus the preset value, for example, minus 100. kPa .

[0085] If the out-of-step type is high-pressure out-of-step, after the high-pressure pressure drops to a reasonable level, the out-of-step problem of the electronic expansion valve will also be solved, and the opening of the electronic expansion valve can continue to be adjusted. Therefore, while controlling the compressor to maintain the current frequency or adjusting the frequency of the compressor according to the outlet water temperature or inlet water temperature of the air-conditioning equipment, the above method also includes: adjusting the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat.

[0086] In the case where the electronic expansion valve is completely out of step, the opening of the electronic expansion valve cannot be adjusted and the frequency can only be reduced first. The inherent logic inside the air-conditioning equipment is that when the exhaust temperature exceeds the frequency reduction temperature threshold, the compressor is controlled to reduce the frequency. However, it is possible that the exhaust temperature has not exceeded the frequency reduction temperature threshold and the compressor frequency reduction operation cannot be triggered. In order to smoothly reduce the frequency, the frequency reduction temperature threshold can be controlled to be lowered to ensure that the exhaust temperature is greater than or equal to the frequency reduction temperature threshold. The compressor frequency reduction is controlled according to the exhaust temperature and the frequency reduction temperature threshold, including: judging whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold; if so, controlling the compressor to reduce the frequency, and then triggering to judge whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold; if not, adjusting the frequency of the compressor according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, and then triggering to judge whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold, forming a cycle control.

[0087] In cooling mode, the higher the outlet water temperature or the inlet water temperature is, the higher the heat exchange demand is, and the higher the frequency of the compressor needs to be; in cooling mode, the higher the outlet water temperature or the inlet water temperature is, the lower the heat exchange demand is, and the lower the frequency of the compressor needs to be. Therefore, in cooling mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, including: judging the relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is greater than the corresponding target temperature, the compressor is controlled to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, the compressor is controlled to maintain the current frequency; if the outlet water temperature or the inlet water temperature is less than the corresponding target temperature, the compressor is controlled to reduce the frequency; in heating mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, including: judging the relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is less than the corresponding target temperature, the compressor is controlled to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, the compressor is controlled to maintain the current frequency; if the outlet water temperature or the inlet water temperature is greater than the corresponding target temperature, the compressor is controlled to reduce the frequency.

[0088] In the cooling mode, the superheat parameter is the suction superheat, and the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, including: determining the range of the difference between the suction superheat and the target suction superheat; if the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase; if the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged; if the difference is less than 0, the opening of the electronic expansion valve is controlled to decrease.

[0089] In the heating mode, the superheat parameter is the exhaust superheat, and the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, including: determining the range of the difference between the exhaust superheat and the target exhaust superheat; if the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase; if the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged; if the difference is less than 0, the opening of the electronic expansion valve is controlled to decrease.

[0090] Example 2

[0091] This embodiment provides another control method, which is applied to an air-conditioning device having an electronic expansion valve. Figure 2 FIG. 1 is a flow chart of a control method according to another embodiment of the present invention. This embodiment is described by taking heating as an example. Figure 2 As shown, the control method includes:

[0092] S21, judging whether to enter the out-of-step detection according to the exhaust gas temperature Texh and the exhaust gas superheat P of the compressor.

[0093] S22, after entering the out-of-step detection, the opening of the electronic expansion valve is controlled according to the difference between the exhaust gas superheat P and the target exhaust gas superheat.

[0094] S23, judging whether the electronic expansion valve has lost step according to the change of exhaust superheat.

[0095] S24, after the electronic expansion valve loses step, controls the compressor to reduce frequency.

[0096] S25, determine the type of out-of-step according to the change of exhaust superheat.

[0097] S26, executing corresponding control strategy according to the type of out-of-step.

[0098] Figure 3 Flowchart of determining whether to enter the out-of-step detection process according to an embodiment of the present invention. Figure 3 As shown, judging whether to enter out-of-step detection includes:

[0099] S31, obtaining the exhaust temperature Texh of the compressor.

[0100] S32, determine whether Texh is within the interval [TL, TH]; if yes, execute step S33; if not, return to step S31.

[0101] S33, obtaining the exhaust gas superheat degree P.

[0102] S34, determine whether the exhaust superheat is within the interval [SPL, SPH]; if yes, execute step S35; if not, return to step S33.

[0103] S35, determining whether the duration of the exhaust superheat being in the interval [SPL, SPH] exceeds a third preset duration t3; if yes, executing step S36; if no, returning to step S34.

[0104] S36, enter out-of-step detection.

[0105] During the operation of the air-conditioning equipment, the compressor exhaust temperature Texh is continuously detected to see if it is within the range of [TL, TH]. When the exhaust temperature Texh exceeds the range [TL, TH], the exhaust superheat P is obtained. Exhaust superheat = exhaust temperature - saturation temperature corresponding to exhaust pressure. If the exhaust superheat P is detected to be out of the range of [SPL, SPH] for a continuous period of t3, the electronic expansion valve loss detection step is entered.

[0106] Figure 4 Flow chart of the out-of-step detection process according to an embodiment of the present invention. Figure 4 As shown in the figure, the out-of-step detection process includes:

[0107] S41, controlling the opening of the electronic expansion valve according to the difference between the exhaust gas superheat degree P and the target exhaust gas superheat degree.

[0108] S42, determine whether the exhaust superheat is within the interval [SPL, SPH]; if yes, execute step S43; if not, return to step S44.

[0109] S43, determining that the electronic expansion valve is not out of step, and exiting out of step detection.

[0110] S44, determining whether the duration of entering the out-of-step detection exceeds the first preset duration t1; if yes, executing step S45; if no, returning to step S42.

[0111] S45, determining whether the electronic expansion valve is out of step.

[0112] During the period when the opening of the electronic expansion valve is controlled according to the difference between the exhaust superheat P and the target exhaust superheat, if the exhaust superheat P changes to within the range of [SPL, SPH], it is determined that the electronic expansion valve has not lost step, and the loss-of-step detection is exited. The electronic expansion valve enters routine adjustment under normal circumstances. If the exhaust superheat P is not within the range of [SPL, SPH] after the opening adjustment of the electronic expansion valve continues for t1 time, it indicates that the electronic expansion valve has lost step.

[0113] Figure 5 FIG. 4 is a flow chart of a process for determining a type of out-of-step according to an embodiment of the present invention. Figure 5 As shown in FIG. 1 , the out-of-step judgment process includes:

[0114] S51, controlling the compressor to reduce frequency.

[0115] S52, determine whether the exhaust gas superheat is within the interval [SPL, SPH]; if yes, execute step S53; if not, return to step S51.

[0116] S53, determining that the out-of-step type of the electronic expansion valve is high-pressure out-of-step.

[0117] S54, determining whether the frequency reduction duration of the compressor is greater than the second preset duration t2; if yes, executing step S55; if no, returning to step S52.

[0118] S55: Determine whether the electronic expansion valve has lost step or not.

[0119] Control the compressor to reduce frequency. If the compressor reduces frequency for a continuous period of t2 and the exhaust superheat P is still not in the range of [SPL, SPH], the electronic expansion valve is judged to be completely out of step. If the exhaust superheat P is in the range of [SPL, SPH], the electronic expansion valve is judged to be out of step at high pressure. At the same time, the high pressure Pl corresponding to the exhaust superheat P entering the range of [SPL, SPH] is recorded as the first pressure threshold.

[0120] Figure 6 FIG. 4 is a flow chart of a complete out-of-step control process according to an embodiment of the present invention. Figure 6 As shown in Figure 1, the control process of complete out-of-step includes:

[0121] S61, controlling the frequency reduction temperature threshold to be lowered to Ts.

[0122] S62, determine whether the exhaust temperature Texh ≥ Ts of the compressor is established; if yes, execute step S63; if not, execute step S64.

[0123] S63, controls the compressor to reduce frequency.

[0124] S64, adjusting the frequency of the compressor according to the outlet water temperature or the inlet water temperature of the air conditioning equipment.

[0125] When the electronic expansion valve is completely out of step, the frequency reduction temperature threshold is reduced to Ts. When the exhaust temperature Texh of the compressor is less than Ts, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature. When the exhaust temperature Texh is greater than or equal to Ts, the frequency reduction action is performed.

[0126] Figure 7 : is a flow chart of a control process of high voltage out-of-step according to an embodiment of the present invention. Figure 7 As shown in the figure, the control process of high voltage out-of-step includes:

[0127] S71, obtaining the high pressure of the air conditioning equipment.

[0128] S72, determine the relationship between the high pressure value and the first pressure threshold value P1; if the high pressure value ≥ P1, execute step S73; if P1-100 k Pa ≤ high pressure value<P1, then execute step S74; if high pressure value<P1-100 k Pa , then execute step S75.

[0129] 73, control the compressor to reduce frequency.

[0130] 74, control the compressor to maintain the current frequency, and adjust the opening of the electronic expansion valve according to the difference between the exhaust superheat and the target superheat.

[0131] 75. The frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, and the opening of the electronic expansion valve is adjusted according to the difference between the exhaust superheat and the target superheat.

[0132] When the compressor is out of step, the high pressure is detected before each adjustment. When the pressure value is greater than or equal to P1, the compressor performs frequency reduction. When the pressure is less than P1 and greater than or equal to Pl-100 kPa The compressor frequency is maintained, and the opening of the electronic expansion valve is adjusted according to the difference between the exhaust superheat and the target superheat. k Pa When the air conditioner is in a state of exhaust gas, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air conditioner, and the opening of the electronic expansion valve is adjusted according to the difference between the exhaust superheat and the target superheat.

[0133] The present invention can detect whether the electronic expansion valve is out of step in real time during the operation of the air-conditioning equipment, and distinguish the out-of-step type as complete out-of-step or high-pressure out-of-step, and implement the frequency of the compressor and the electronic expansion valve according to the out-of-step situation, so as to maintain the normal operation of the air-conditioning equipment as much as possible and reduce the probability of unit failure and shutdown. At the same time, when out-of-step occurs, timely feedback can be given to the user to remind the user to replace the electronic expansion valve component.

[0134] Example 3

[0135] This embodiment provides a control device for implementing the control method of the above embodiment. Figure 8 is a structural block diagram of a control device according to an embodiment of the present invention, Figure 8 As shown, the control device includes:

[0136] The first detection module 10 is used to control the air-conditioning equipment to enter out-of-step detection when the exhaust temperature of the compressor is not in the first preset range and the superheat parameter is not in the second preset range: adjusting the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat, and then judging whether the electronic expansion valve is out of step according to the change of the superheat parameter.

[0137] When the electronic expansion valve works normally, the exhaust temperature and superheat parameters of the compressor will fluctuate within a relatively fixed range. If the electronic expansion valve is out of step, that is, it cannot be opened or closed normally, then the exhaust temperature and superheat parameters will fluctuate greatly, exceeding the normal range. Therefore, when the exhaust temperature of the compressor is not in the first preset interval and the superheat parameter is not in the second preset interval, it indicates that the electronic expansion valve may have a problem of losing step. In order to determine whether the electronic expansion valve has really lost step, the air conditioning device is controlled to enter the out-of-step detection. The upper limit of the first preset interval can be the target exhaust temperature floating up by the first preset temperature, and the lower limit of the first preset interval can be the target exhaust temperature floating down by the first preset temperature; the upper limit of the second preset interval can be the target superheat parameter floating up by the second preset temperature, and the lower limit of the second preset interval can be the target superheat parameter floating down by the second preset temperature. In order to avoid accidental factors, after the superheat parameter is not in the second preset interval for a period of time exceeding the third preset period, the air conditioning device is controlled to enter the out-of-step detection.

[0138] If the electronic expansion valve has not lost step, then the difference between the superheat parameter and the corresponding target superheat will adjust the opening of the electronic expansion valve according to the correct trend, and the superheat parameter will be closer to the target superheat and finally fall into the second preset interval. However, if the electronic expansion valve has lost step and the opening adjustment fails, then no matter how the opening of the electronic expansion valve is adjusted, the superheat parameter will not fall into the second preset interval. Therefore, in order to determine whether the electronic expansion valve has really lost step, the opening of the electronic expansion valve is first adjusted according to the difference between the superheat parameter and the corresponding target superheat. If the superheat parameter falls into the second preset interval after the opening is adjusted, it means that the opening adjustment of the electronic expansion valve is effective and the electronic expansion valve has not lost step; if the superheat parameter does not fall into the second preset interval after the opening is adjusted, it means that the opening adjustment of the electronic expansion valve is invalid and the electronic expansion valve has lost step.

[0139] The second detection module 20 is used to control the compressor to reduce the frequency after determining that the electronic expansion valve is out of step, and then determine the out-of-step type of the electronic expansion valve according to the change of the superheat parameter.

[0140] After determining that the electronic expansion valve is out of step, it is necessary to determine the specific type of out of step. The out of step of the electronic expansion valve may be caused by excessive high pressure, which is called high-pressure out of step; the out of step of the electronic expansion valve may be caused by damage to the device itself, which is called complete out of step.

[0141] The control module 30 is used to execute a corresponding control strategy according to the type of out-of-step of the electronic expansion valve.

[0142] For high-pressure out-of-step, the problem can be solved by reducing the high-pressure pressure (i.e., the exhaust pressure of the compressor), while for complete out-of-step, the opening of the electronic expansion valve cannot be adjusted, and the heat exchange amount can only be changed by adjusting the compressor frequency, etc. It can be seen that the corresponding control strategy needs to be implemented according to the out-of-step type of the electronic expansion valve.

[0143] In the control device of this embodiment, the first detection module 10 controls the air-conditioning equipment to enter out-of-step detection when the exhaust temperature of the compressor is not in the first preset interval and the superheat parameter is not in the second preset interval. After entering the out-of-step detection, the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, and then it is judged whether the electronic expansion valve is out of step according to the change of the superheat parameter, so that the out-of-step situation of the electronic expansion valve can be discovered in time and accurately. After determining that the electronic expansion valve is out of step, the second detection module 20 controls the compressor to reduce the frequency, and then determines the out-of-step type of the electronic expansion valve according to the change of the superheat parameter. The control module 30 executes the corresponding control strategy according to the out-of-step type of the electronic expansion valve, so as to achieve a targeted solution to the out-of-step problem of the electronic expansion valve, thereby achieving accurate adjustment of the heat exchange amount of the air-conditioning equipment according to the actual working conditions, and ensuring the heat exchange effect of the air-conditioning equipment.

[0144] According to the foregoing, if the electronic expansion valve is out of step and the opening adjustment fails, then no matter how the opening of the electronic expansion valve is adjusted, the superheat parameter will not fall into the second preset interval. However, if the number of steps for adjusting the electronic expansion valve at one time is adjusted too small, the superheat parameter may not fall into the second preset interval, and the change of the superheat parameter lags behind the step adjustment of the electronic expansion valve. Therefore, in order to improve the accuracy of the judgment result, the step adjustment of the electronic expansion valve needs to be maintained for a period of time. If the superheat parameter is still not adjusted to the second preset interval after this period of time, it can be said that a loss of step has occurred. Therefore, the first detection module 10 is specifically used to: determine whether the superheat parameter is in the second preset interval; if so, determine that the electronic expansion valve is not out of step and exit the loss of step detection; if not, determine whether the time for entering the loss of step detection exceeds the first preset time; if so, determine that the electronic expansion valve is out of step; if not, continue to adjust the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat.

[0145] High-pressure out-of-step can be solved by reducing the high-pressure pressure, and controlling the compressor to reduce the frequency will cause the high-pressure pressure to decrease, which can effectively solve the high-pressure out-of-step. Therefore, after the second detection module 20 controls the compressor to reduce the frequency, it also performs the following operations: determine whether the superheat parameter is in the second preset interval; if so, it indicates that the electronic expansion valve out-of-step can be solved by controlling the compressor to reduce the frequency, and the out-of-step type of the electronic expansion valve is determined to be high-pressure out-of-step; if not, determine whether the compressor reduction time exceeds the second preset time; if so, it indicates that the electronic expansion valve out-of-step cannot be solved by controlling the compressor to reduce the frequency, and the electronic expansion valve out-of-step type is determined to be complete out-of-step; if not, it may be that the frequency reduction time is insufficient and the high-pressure pressure is still high, resulting in the inability to solve the out-of-step problem. Therefore, continue to control the compressor to reduce the frequency until the superheat parameter is in the second preset interval or the frequency reduction time exceeds the second preset time.

[0146] In order to solve the out-of-step problem in a targeted manner according to the characteristics of different out-of-step types, the control module 30 is specifically used to: when the out-of-step type of the electronic expansion valve is high-pressure out-of-step, adjust the frequency of the compressor according to the high-pressure pressure; when the out-of-step type of the electronic expansion valve is complete out-of-step, control the frequency reduction temperature threshold to be lowered, and then control the compressor frequency reduction according to the exhaust temperature and the frequency reduction temperature threshold.

[0147] The higher the high pressure, the more the compressor frequency needs to be reduced. Therefore, the control module 30 is specifically used to: determine the interval in which the high pressure is located; when the high pressure is greater than or equal to the first pressure threshold, control the compressor to reduce the frequency; when the high pressure is greater than or equal to the second pressure threshold, and less than the first pressure threshold, control the compressor to maintain the current frequency; when the high pressure is less than the second pressure threshold, it indicates that the high pressure has been reduced to a reasonable level, and the frequency of the compressor can be adjusted according to the outlet water temperature or inlet water temperature of the air-conditioning equipment. Among them, the first pressure threshold is the high pressure pressure value corresponding to the superheat parameter entering the second preset interval when the electronic expansion valve has a high pressure out of step when judging the out of step type in the past, and the second pressure threshold is the first pressure threshold minus the preset value, for example, 100kPa.

[0148] If the out-of-step type is high-pressure out-of-step, after the high-pressure pressure drops to a reasonable level, the out-of-step problem of the electronic expansion valve will also be solved, and the opening of the electronic expansion valve can continue to be adjusted. Therefore, the control module 30 controls the compressor to maintain the current frequency or adjust the frequency of the compressor according to the outlet water temperature or inlet water temperature of the air-conditioning equipment, and also performs the following operations: adjust the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat.

[0149] When the electronic expansion valve is completely out of step, the opening of the electronic expansion valve cannot be adjusted and the frequency can only be reduced first. The inherent logic inside the air-conditioning equipment is that when the exhaust temperature exceeds the frequency reduction temperature threshold, the compressor is controlled to reduce the frequency. However, it is possible that the exhaust temperature has not exceeded the frequency reduction temperature threshold and the compressor frequency reduction operation cannot be triggered. In order to smoothly reduce the frequency, the frequency reduction temperature threshold can be controlled to be lowered to ensure that the exhaust temperature is greater than or equal to the frequency reduction temperature threshold. When the control module 30 controls the compressor to reduce the frequency according to the exhaust temperature and the frequency reduction temperature threshold, the following specific operations are performed: determine whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold; if so, control the compressor to reduce the frequency, and then trigger the determination of whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold; if not, adjust the frequency of the compressor according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, and then trigger the determination of whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold, thereby forming a cycle control.

[0150] In cooling mode, the higher the outlet water temperature or the inlet water temperature is, the higher the heat exchange demand is, and the higher the frequency of the compressor needs to be; in cooling mode, the higher the outlet water temperature or the inlet water temperature is, the lower the heat exchange demand is, and the lower the frequency of the compressor needs to be. Therefore, in cooling mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, including: judging the relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is greater than the corresponding target temperature, the compressor is controlled to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, the compressor is controlled to maintain the current frequency; if the outlet water temperature or the inlet water temperature is less than the corresponding target temperature, the compressor is controlled to reduce the frequency; in heating mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, including: judging the relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is less than the corresponding target temperature, the compressor is controlled to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, the compressor is controlled to maintain the current frequency; if the outlet water temperature or the inlet water temperature is greater than the corresponding target temperature, the compressor is controlled to reduce the frequency.

[0151] In the cooling mode, the superheat parameter is the suction superheat, and the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, including: determining the range of the difference between the suction superheat and the target suction superheat; if the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase; if the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged; if the difference is less than 0, the opening of the electronic expansion valve is controlled to decrease.

[0152] In the heating mode, the superheat parameter is the exhaust superheat, and the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, including: determining the range of the difference between the exhaust superheat and the target exhaust superheat; if the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase; if the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged; if the difference is less than 0, the opening of the electronic expansion valve is controlled to decrease.

[0153] Example 3

[0154] This embodiment provides an air conditioning device, Fig. 9 FIG. 1 is a structural block diagram of an air conditioning device according to an embodiment of the present invention. Fig. 9 As shown, the air-conditioning equipment includes an electronic expansion valve and a variable frequency compressor, and also includes an exhaust temperature sensor arranged at the exhaust port of the compressor, a high-pressure pressure sensor arranged at the exhaust port of the compressor, and a main control board, which includes the control device of the above embodiment.

[0155] Example 4

[0156] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the control method of the above embodiment is implemented.

[0157] Example 5

[0158] This embodiment provides an electronic device, including:

[0159] one or more processors;

[0160] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the above embodiment.

[0161] Fig.10 FIG. 1 is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Fig.10 As shown, the electronic device includes:

[0162] One or more processors 1010 and memory 1020, Fig.10 A processor 1010 is taken as an example.

[0163] The electronic device may further include: an input device 1030 and an output device 1040 .

[0164] The processor 1010, the memory 1020, the input device 1030 and the output device 1040 may be connected via a bus or other means. Fig.10 The example of connecting through bus is taken in the following.

[0165] The memory 1020 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the control method in the embodiment of the present invention. The processor 1010 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 1020, that is, implementing the above method embodiment.

[0166] The memory 1020 may include a program storage area and a data storage area, wherein the program storage area may store an application required for operating the device and at least one function; the data storage area may store data created according to the use of the control device, etc. In addition, the memory 1020 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0167] The input device 1030 may receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 1040 may include a display device such as a display screen.

[0168] The one or more modules are stored in the memory 1020, and when executed by the one or more processors 1010, perform the control method in any of the above method embodiments.

[0169] The electronic device product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0170] The electronic device of the embodiment of the present invention exists in various forms, including but not limited to:

[0171] (1) Mobile communication devices: These devices are characterized by having mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0172] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0173] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, smart toys, and portable car navigation devices.

[0174] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to a general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0175] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0176] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0177] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method, applied to an air conditioning device equipped with an electronic expansion valve, characterized in that: The method comprises: When the exhaust temperature of the compressor is not in the first preset range and the superheat parameter is not in the second preset range, the air conditioning device is controlled to enter out-of-step detection: the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, and then whether the electronic expansion valve is out of step is determined according to the change of the superheat parameter; After determining that the electronic expansion valve is out of step, controlling the compressor to reduce frequency, and then determining the out of step type of the electronic expansion valve according to the change of the superheat parameter; The corresponding control strategy is executed according to the type of loss of step of the electronic expansion valve.

2. The method according to claim 1, characterized in that Determine whether the electronic expansion valve is out of step based on the changes in superheat parameters, including: determining whether the superheat parameter is within a second preset range; If yes, it is determined that the electronic expansion valve is not out of step, and the out-of-step detection is exited; If not, determine whether the time for entering the out-of-step detection exceeds the first preset time; if yes, determine that the electronic expansion valve is out of step; if not, continue to adjust the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat.

3. The method according to claim 1, characterized in that Controlling the compressor to reduce frequency, and then determining the out-of-step type of the electronic expansion valve according to the change of the superheat parameter, including: determining whether the superheat parameter is within a second preset range; If yes, it is determined that the out-of-step type of the electronic expansion valve is high-pressure out-of-step; If not, determine whether the frequency reduction duration of the compressor exceeds a second preset duration; if yes, determine that the out-of-step type of the electronic expansion valve is complete out-of-step; if not, continue to control the compressor to reduce frequency until the superheat parameter is in the second preset interval or the frequency reduction duration exceeds the second preset duration.

4. The method according to claim 1, characterized in that: Execute corresponding control strategies according to the out-of-step type of the electronic expansion valve, including: If the out-of-step type of the electronic expansion valve is high-pressure out-of-step, adjusting the frequency of the compressor according to the high-pressure pressure; If the out-of-step type of the electronic expansion valve is complete out-of-step, the frequency reduction temperature threshold is controlled to be lowered, and then the compressor is controlled to reduce the frequency according to the exhaust temperature and the frequency reduction temperature threshold.

5. The method according to claim 4, characterized in that Adjusting the frequency of the compressor according to the high pressure comprises: Determining the interval in which the high pressure is located; If the high pressure is greater than or equal to a first pressure threshold, controlling the compressor to reduce frequency; If the high pressure is greater than or equal to the second pressure threshold and less than the first pressure threshold, the compressor is controlled to maintain the current frequency; If the high pressure is less than the second pressure threshold, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air conditioning device.

6. The method according to claim 5, characterized in that While controlling the compressor to maintain a current frequency or adjusting the frequency of the compressor according to the outlet water temperature or the inlet water temperature of the air conditioning device, the method further includes: The opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat.

7. The method according to claim 4, characterized in that Controlling the compressor frequency reduction according to the exhaust temperature and the frequency reduction temperature threshold includes: Determining whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold; If yes, the compressor is controlled to reduce frequency, and then a trigger is triggered to determine whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold; If not, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning device, and then a trigger is triggered to determine whether the exhaust temperature is greater than or equal to the frequency reduction temperature threshold.

8. The method according to any one of claims 5 to 7, characterized in that In the cooling mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning device, including: judging the magnitude relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is greater than the corresponding target temperature, controlling the compressor to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, controlling the compressor to maintain the current frequency; if the outlet water temperature or the inlet water temperature is less than the corresponding target temperature, controlling the compressor to reduce the frequency; In the heating mode, the frequency of the compressor is adjusted according to the outlet water temperature or the inlet water temperature of the air-conditioning equipment, including: judging the relationship between the outlet water temperature or the inlet water temperature and the corresponding target temperature; if the outlet water temperature or the inlet water temperature is lower than the corresponding target temperature, controlling the compressor to increase the frequency; if the outlet water temperature or the inlet water temperature is equal to the corresponding target temperature, controlling the compressor to maintain the current frequency; if the outlet water temperature or the inlet water temperature is higher than the corresponding target temperature, controlling the compressor to reduce the frequency.

9. The method according to claim 1, characterized in that: In the cooling mode, the superheat parameter is the suction superheat, and the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, including: determining a range of a difference between the suction air superheat and the target suction air superheat; If the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase; If the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged; If the difference is less than 0, the opening degree of the electronic expansion valve is controlled to decrease.

10. The method according to claim 1, characterized in that In the heating mode, the superheat parameter is the exhaust superheat, and the opening of the electronic expansion valve is adjusted according to the difference between the superheat parameter and the corresponding target superheat, including: determining a range of a difference between the exhaust superheat and the target exhaust superheat; If the difference is greater than 0, the opening of the electronic expansion valve is controlled to increase; If the difference is equal to 0, the opening of the electronic expansion valve is controlled to remain unchanged; If the difference is less than 0, the opening degree of the electronic expansion valve is controlled to decrease.

11. A control device for implementing the control method according to any one of claims 1 to 10, characterized in that: The device comprises: The first detection module is used to control the air-conditioning device to enter out-of-step detection when the exhaust temperature of the compressor is not in the first preset range and the superheat parameter is not in the second preset range: adjusting the opening of the electronic expansion valve according to the difference between the superheat parameter and the corresponding target superheat, and then judging whether the electronic expansion valve is out of step according to the change of the superheat parameter; A second detection module is used to control the compressor to reduce the frequency after determining that the electronic expansion valve is out of step, and then determine the out-of-step type of the electronic expansion valve according to the change of the superheat parameter; The control module is used to execute corresponding control strategies according to the out-of-step type of the electronic expansion valve.

12. An air conditioning device, comprising an electronic expansion valve and a variable frequency compressor, characterized in that: Also includes the control device as claimed in claim 11.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

14. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the method according to any one of claims 1 to 10.

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