Control method and control device of air conditioner, air conditioner and computer storage medium

Abstract

The invention belongs to the technical field of air conditioner equipment, and particularly relates to a control method and device of an air conditioner, the air conditioner and a computer storage medium. The control method comprises the steps that the air conditioner is controlled to enter a liquid drainage mode according to the condition that the air conditioner is started and operation parameters meet liquid drainage conditions; the compressor is controlled to operate at the first preset frequency, the electronic expansion valve is controlled to operate at the first liquid drainage opening degree, the compressor is controlled to operate at the second preset frequency according to the condition that the air return superheat degree meets the first preset condition, the electronic expansion valve is controlled to operate at the second liquid drainage opening degree, and the second liquid drainage opening degree is larger than the first liquid drainage opening degree. And the compressor is controlled to operate at a third preset frequency according to the fact that the exhaust superheat degree meets a second preset condition, the air conditioner is controlled to be switched to the normal working mode according to the fact that the exhaust superheat degree meets a third preset condition, and the electronic expansion valve is controlled to be in the normal working mode. The quick start of the air conditioner is realized, and the damage to the compressor is reduced.

Description

Technical Field

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

[0002] When the air conditioner is running under low temperature conditions, the evaporator cannot immediately evaporate enough refrigerant, and the unit is very likely to run with liquid.

[0003] When the unit is running with liquid, it is very easy to cause liquid hammer in the compressor. Long-term and heavy liquid hammer can cause the valve plate and other components of the compressor to deform and rupture, and even cause permanent damage to the compressor. Summary of the invention

[0004] The object of the present invention is to at least solve the problem of how to reduce the damage of the compressor caused by liquid hammer, and this object is achieved by the following methods:

[0005] A first aspect of the present invention provides a method for controlling an air conditioner, the method comprising:

[0006] According to the air conditioner being started and the operating parameters satisfying the drainage condition, controlling the air conditioner to enter the drainage mode;

[0007] According to the air conditioner entering the liquid discharge mode, controlling the compressor to operate at a first preset frequency, and controlling the electronic expansion valve to operate at a first liquid discharge opening;

[0008] According to the return air superheat satisfying the first preset condition, controlling the compressor to operate at a second preset frequency, and controlling the electronic expansion valve to operate at a second liquid discharge opening, wherein the second preset frequency is greater than the first preset frequency, and the second liquid discharge opening is greater than the first liquid discharge opening;

[0009] According to the exhaust gas superheat satisfying the second preset condition, controlling the compressor to operate at a third preset frequency, wherein the third preset frequency is greater than the second preset frequency;

[0010] According to the exhaust gas superheat degree satisfying the third preset condition, the air conditioner is controlled to switch to the normal working mode, and the electronic expansion valve is controlled in the normal working mode.

[0011] According to the control method of the air conditioner of the present invention, in the startup phase of the air conditioner, when the operating parameters of the air conditioner meet the drainage conditions, the air conditioner is first controlled to drain the liquid, and then through the first preset condition, the second preset condition and the third preset condition, on the basis of draining the liquid of the air conditioner, the frequency of the air conditioner is increased in stages, thereby achieving a quick start of the air conditioner, reducing the operation of the air conditioner with liquid, and reducing the damage to the compressor of the air conditioner caused by liquid shock.

[0012] In addition, the control method of the air conditioner according to the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, the step of controlling the air conditioner to enter the drainage mode according to the air conditioner being started and the operating parameters satisfying the drainage condition includes:

[0014] Calculating the return air superheat of the compressor;

[0015] Determining whether the return air superheat is greater than or equal to zero;

[0016] According to the return air superheat being less than zero, it is determined that the air conditioner meets the liquid discharge condition, and the air conditioner is controlled to enter the liquid discharge mode.

[0017] In some embodiments of the present invention, the step of calculating the return air superheat of the compressor includes:

[0018] Get the return air refrigerant temperature;

[0019] Get the return air refrigerant pressure;

[0020] Obtaining a refrigerant saturation temperature corresponding to the return air refrigerant pressure;

[0021] The difference between the refrigerant saturation temperature and the return air refrigerant temperature is calculated, and the difference is determined as the return air superheat.

[0022] In some embodiments of the present invention, before the step of controlling the compressor to operate at a second preset frequency and controlling the electronic expansion valve to operate at a second liquid discharge opening according to the return air superheat satisfying the first preset condition, wherein the second preset frequency is greater than the first preset frequency and the second liquid discharge opening is greater than the first liquid discharge opening, the step further includes:

[0023] Obtaining a first operating time of the air conditioner;

[0024] Calculating a first change rate of return air superheat according to the return air superheat and the first operation time;

[0025] According to the first operating time reaching the first preset time, and the duration for which the return air superheat is greater than or equal to zero reaches a second preset time, it is determined that the return air superheat satisfies the first preset condition; or, according to the first operating time reaching the first preset time, and the duration for which the first change rate is greater than or equal to zero reaches a second preset time, it is determined that the return air superheat satisfies the first preset condition.

[0026] In some embodiments of the present invention, the first preset time length is t1, where t1 is within the interval of 1 min-3 min;

[0027] And / or, the second preset duration is t2, wherein t2 is in the interval of 1 min-3 min.

[0028] In some embodiments of the present invention, before the step of controlling the compressor to operate at a third preset frequency according to the exhaust gas superheat satisfying the second preset condition, wherein the third preset frequency is greater than the second preset frequency, the step further includes:

[0029] calculating the exhaust superheat of the compressor;

[0030] calculating a second rate of change of the exhaust gas superheat;

[0031] According to the fact that the exhaust superheat degree is greater than the first preset temperature for a third preset time period and the second change rate is greater than or equal to zero for a fourth preset time period, it is determined that the exhaust superheat degree meets the second preset condition.

[0032] In some embodiments of the present invention, after the step of determining that the exhaust superheat satisfies the second preset condition according to the duration that the exhaust superheat is greater than the first preset temperature for a third preset duration and the duration that the second change rate is greater than or equal to zero for a fourth preset duration, the method further includes:

[0033] According to the exhaust gas superheat being less than the first preset temperature for a continuous period reaching a fifth preset period, and the second change rate being less than zero for a continuous period reaching a sixth preset period, the air conditioner is controlled to enter the drainage mode.

[0034] In some embodiments of the present invention, before the step of controlling the air conditioner to switch to a normal working mode according to the exhaust gas superheat degree satisfying the third preset condition, and the electronic expansion valve being controlled in the normal working mode, the step further includes:

[0035] According to the duration for which the exhaust superheat degree is greater than or equal to the second preset temperature reaching the seventh preset duration, and the second change rate being greater than zero, it is determined that the exhaust superheat degree meets the third preset condition.

[0036] In some embodiments of the present invention, the third preset time length is t3, where t3 is within the interval of 1 min-3 min;

[0037] And / or, the fourth preset time length is t4, wherein t4 is within the interval of 1 min-3 min;

[0038] And / or, the fifth preset time length is t5, wherein t5 is within the interval of 1 min-5 min;

[0039] And / or, the sixth preset time length is t6, wherein t6 is less than 1 minute;

[0040] And / or, the seventh preset time length is t7, wherein t7 is in the interval of 10s-180s;

[0041] And / or, the first preset temperature is T1, wherein T1 is less than or equal to 5°C.

[0042] In some embodiments of the present invention, before the step of controlling the air conditioner to switch to a normal working mode according to the exhaust gas superheat degree satisfying the third preset condition, and the electronic expansion valve being controlled in the normal working mode, the step further includes:

[0043] According to the fact that the exhaust superheat degree is greater than or equal to the second preset temperature for a seventh preset time period and the second change rate is greater than zero, it is determined that the exhaust superheat degree meets the third preset condition.

[0044] A second aspect of the present invention provides a control device for an air conditioner, the control device being used to implement the control method for the air conditioner as described above, comprising:

[0045] An acquisition module, the acquisition module is used to acquire the operating parameters of the air conditioner;

[0046] A control module is used to switch the mode of the air conditioner, control the operating frequency of the air conditioner and control the opening degree of the electronic expansion valve.

[0047] A third aspect of the present invention provides an air conditioner, comprising the control device for the air conditioner as described above.

[0048] The fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by the processor, the control method of the air conditioner as described above is implemented. The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0050] Figure 1 A flow chart schematically shows a method for controlling an air conditioner according to the present invention;

[0051] Figure 2 The logic diagram of the control method of the air conditioner according to the present invention is schematically shown (in the figure, the parameter Txh is the return air superheat, ΔTxh is the first change rate of the return air superheat, Tph is the exhaust gas superheat, ΔTph is the second change rate of the exhaust gas superheat, T2 is the first preset temperature, and P is the opening of the electronic expansion valve);

[0052] Figure 3 Schematically shows a simplified structural diagram of an air conditioner according to the present invention;

[0053] Figure 4 The structure diagram of the control device of the air conditioner according to the present invention is schematically shown.

[0054] The reference numerals in the accompanying drawings represent the following:

[0055] 1000. Air conditioner;

[0056] 100. Control device;

[0057] 101. Acquisition module; 102. Control module; 103. Storage medium;

[0058] 200. Air conditioner indoor unit;

[0059] 300. Air conditioner outdoor unit;

[0060] 301. Compressor; 302. Electronic expansion valve. DETAILED DESCRIPTION

[0061] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0062] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0063] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0064] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0065] In an embodiment of the present invention, the air conditioner 1000 includes an air conditioner indoor unit 200 and an air conditioner outdoor unit 300. The air conditioner outdoor unit 300 is usually installed outdoors, and the air conditioner indoor unit 200 is usually installed indoors. The air conditioner indoor unit 200 and the air conditioner outdoor unit 300 work together to achieve the cooling, heating, dehumidification and air purification functions of the air conditioner 1000 to achieve comfortable air quality.

[0066] In the air conditioner 1000, there is usually one air conditioner outdoor unit 300, and there may be more than one air conditioner indoor unit 200. Each air conditioner indoor unit 200 is provided with one or more air outlets to discharge the refrigerated, heated, dehumidified or purified air into the room through the air outlets. An indoor heat exchanger is usually provided in the air conditioner indoor unit 200, and an outdoor heat exchanger is usually provided in the air conditioner outdoor unit 300. The indoor heat exchanger and the outdoor heat exchanger are usually connected through a refrigerant pipeline so that the refrigerant can flow between the indoor heat exchanger and the outdoor heat exchanger.

[0067] During the cooling process of the air conditioner 1000, the indoor heat exchanger is an evaporator, and the refrigerant in the evaporator absorbs heat from liquid to gas. In the process of refrigerant evaporation and heat absorption, the evaporator exchanges heat with the air flowing through the evaporator, and takes away the heat in the air in the air-conditioning indoor unit 200, so that the air discharged from the air-conditioning indoor unit 200 is air that has released heat and cooled down, and the air-conditioning indoor unit 200 blows cold air. At the same time, the outdoor heat exchanger is a condenser, and the refrigerant in the condenser changes from gas to liquid. In the process of refrigerant condensation and heat release, the condenser exchanges heat with the air in the air-conditioning outdoor unit 300 flowing through the condenser, so that the air in the air-conditioning outdoor unit 300 brings the heat of the condenser to the outside of the air-conditioning outdoor unit 300, thereby realizing the cooling process.

[0068] During the heating process of the air conditioner 1000, the outdoor heat exchanger is an evaporator, and the refrigerant in the evaporator absorbs heat from liquid to gas. During the process of the refrigerant evaporating and absorbing heat, the evaporator exchanges heat with the air flowing through the evaporator, and replaces the heat carried by the air in the air conditioner indoor unit 200 with the refrigerant in the evaporator. At the same time, the indoor heat exchanger is a condenser, and the refrigerant in the condenser changes from gas to liquid. During the process of the refrigerant condensing and releasing heat, the condenser exchanges heat with the air in the air conditioner outdoor unit 300 flowing through the condenser, so that the air in the air conditioner outdoor unit 300 takes away the heat carried by the condenser and discharges it from the air conditioner indoor unit 200 to the room outside the air conditioner indoor unit 200, so that the indoor unit blows hot air, thus realizing the heating process. When the air conditioner 1000 is in a low temperature environment, wherein the low temperature environment generally refers to an ambient temperature below 15°C, when the air conditioner 1000 is started at this time, the compressor 301 has a liquid shock. In order to improve the situation of liquid shock to the compressor 301 when the air conditioner 1000 is started under low temperature conditions, combined with Figures 1 to 4As shown, the present invention proposes a control method for an air conditioner 1000, and the specific steps are as follows:

[0069] S10. According to the air conditioner 1000 being started and the operating parameters satisfying the drainage conditions, the air conditioner 1000 is controlled to enter the drainage mode.

[0070] Specifically, when the air conditioner 1000 is started, the air conditioner 1000 enters the startup phase, collects the operating parameters of the air conditioner 1000 in the startup phase, and determines whether the air conditioner 1000 meets the discharge condition based on the operating parameters of the air conditioner 1000. When the air conditioner 1000 does not meet the discharge condition, the air conditioner 1000 will not have a liquid hit on the compressor 301, and the air conditioner 1000 can meet the requirements of direct startup, and the air conditioner 1000 can be directly switched to a normal working state. When the air conditioner meets the discharge condition, the air conditioner 1000 needs to be drained, and the air conditioner 1000 is started by gradually increasing the frequency, so as to reduce the situation of liquid hitting the compressor 301.

[0071] Among them, in the embodiment of the present invention, the discharge mode means that the refrigerant entering the compressor 301 is in liquid state, and the flow rate and flow rate of the refrigerant returning to the compressor 301 are controlled to be discharged to the high-pressure side of the compressor 301, so that when the air conditioner 1000 is just started and the superheat is insufficient, the low-pressure tank can be used to contain the system return liquid to the maximum extent, thereby avoiding liquid hammer caused by liquid inhalation by the compressor 301.

[0072] Furthermore, when judging the parameters of the air conditioner 1000 , in the embodiment of the present invention, the parameter used is the return air superheat of the compressor 301 .

[0073] Among them, the return air temperature of the compressor 301 is collected by the acquisition module 101 (temperature sensor), and the return air refrigerant pressure is collected by the acquisition module 101 (pressure sensor). The return air refrigerant pressure is used to obtain the refrigerant saturation temperature corresponding to the current refrigerant pressure (which can be obtained by looking up a table or through the refrigerant pressure and refrigerant saturation curve), and then the return air refrigerant temperature is subtracted from the refrigerant saturation temperature. At this time, the difference between the two is the return air superheat.

[0074] When using the return air superheat to determine whether the air conditioner 1000 needs to perform a liquid discharge operation, the return air superheat is compared with zero. When the return air superheat is less than zero, the return air superheat is insufficient and the compressor 301 is at risk of liquid hammer. When the return air superheat is greater than or equal to zero, the return air superheat can meet the demand, and the refrigerant entering the compressor 301 is in a gaseous state. At this time, the compressor 301 is not subject to liquid hammer.

[0075] Therefore, the return air superheat is less than zero to determine that the air conditioner 1000 is in a liquid hammer situation. At this time, the air conditioner 1000 needs to be switched to the liquid discharge mode to reduce the liquid hammer situation of the compressor 301 through the liquid discharge operation. Using the return air superheat to judge the current state of the air conditioner 1000 can improve the judgment accuracy of the air conditioner 1000, thereby improving the control accuracy of the air conditioner 1000, and further reduce the failure rate of the compressor 301, so that the service life of the compressor 301 can be effectively extended.

[0076] In addition, in addition to using the return air superheat to judge the current state of the air conditioner 1000, the current state of the air conditioner 1000 can also be judged by temperature, that is, using a temperature sensor to detect the current ambient temperature, and comparing the detected ambient temperature with a set temperature threshold (for example, the set temperature threshold is 15°C, etc.). When the detected temperature is higher than the temperature threshold, it is determined that the air conditioner 1000 does not have a liquid hammering compressor 301. When the detected temperature is less than or equal to the temperature threshold, the air conditioner 1000 has a liquid hammering compressor 301.

[0077] S20. According to the air conditioner 1000 entering the liquid discharge mode, the compressor 301 is controlled to operate at a first preset frequency, and the electronic expansion valve 302 is controlled to operate at a first liquid discharge opening.

[0078] Specifically, when the air conditioner 1000 is started and the refrigerant needs to be drained, the control device 100 controls the air conditioner 1000 so that the air conditioner 1000 switches to the drainage mode. During the process of controlling the air conditioner 1000, the control device 100 first controls the compressor 301 to operate at a first preset frequency, and at the same time controls the opening of the electronic expansion valve 302 so that it operates at the first drainage opening.

[0079] Furthermore, the frequency value of the first preset frequency is smaller than the working frequency of the compressor 301, that is, when the compressor 301 operates at the first preset frequency, the compressor 301 is in low-frequency operation, and the compressor 301 works more gently at this time, which reduces the strong impact on the compressor 301 when the liquid refrigerant enters the compressor 301, reduces the damage to the compressor 301 caused by liquid hammer, and prolongs the service life of the compressor 301. At the same time, the value of the first liquid discharge opening is smaller than the opening range of the electronic expansion valve 302, and the flow rate of the refrigerant returning to the compressor 301 through the electronic expansion valve 302 is smaller, that is, by reducing the flow rate of the refrigerant to alleviate the liquid hammer of the liquid refrigerant on the compressor 301, further reducing the damage to the compressor 301, so that the service life of the compressor 301 is further improved.

[0080] In an embodiment of the present invention, the operating frequency of the compressor 301 can be set at 10 Hz-150 Hz, wherein the first preset frequency can be 10 Hz, 15 Hz, 20 Hz, 25 Hz, 30 Hz, or 35 Hz.

[0081] In addition, in an embodiment of the present invention, the electronic expansion valve 302 is connected to a stepper motor, and its opening is driven by the stepper motor, wherein the opening of the electronic expansion valve 302 can be characterized by the steps of the stepper motor, and the opening range of the electronic expansion valve 302 is 0-500 steps, wherein the first preset opening can be set in the range of 40-60 steps, specifically 40 steps, 41 steps, 42 steps, 43 steps, 44 steps, 45 steps, 46 steps, 47 steps, 48 ​​steps, 49 steps, 50 steps, 51 steps, 52 steps, 53 steps, 54 steps, 55 steps, 56 steps, 57 steps, 58 steps, 59 steps, and 60 steps.

[0082] S30. Based on whether the return air superheat satisfies the first preset condition, the compressor 301 is controlled to operate at a second preset frequency, and the electronic expansion valve 302 is controlled to operate at a second liquid discharge opening, wherein the second preset frequency is greater than the first preset frequency, and the second liquid discharge opening is greater than the first liquid discharge opening.

[0083] Specifically, when the air conditioner 1000 is in the startup phase and enters the drainage mode, it is necessary to monitor the status of the air conditioner 1000, judge the current status of the air conditioner 1000 according to the first preset condition, and perform further actions on the air conditioner 1000 according to the judgment result.

[0084] Furthermore, when the air conditioner 1000 operates at a first preset frequency and the electronic expansion valve 302 operates at a first drain opening, the first operating time of the air conditioner 1000 is recorded, and the current return air superheat and the first operating time are calculated to obtain a first change rate of the return air superheat.

[0085] In the process of making a judgment, the first operating time of the air conditioner 1000 is first judged, that is, the first operating time is compared with the first preset time. When the first operating time is less than the first preset time, the air conditioner 1000 is in a relatively unstable state, and the refrigerant volatility is large. Therefore, it is necessary to keep the first operating time greater than or equal to the first preset time. At this time, the air conditioner 1000 is in a relatively stable state and the refrigerant volatility is small.

[0086] In an embodiment of the present invention, the first preset time is defined as t1, wherein 1min≤t1≤3min, that is, the first preset time t1 is set in [1min, 3min], so that the refrigerant is kept in a relatively small time range, thereby effectively shortening the waiting time on the basis of satisfying the requirements of drainage and frequency increase. The specific value of t1 can be 1min, 1.3min, 1.5min, 1.7min, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3min.

[0087] On the basis that the first operating time is greater than or equal to the first preset time, the air conditioner 1000 is further judged. In the process of judgment, the return air superheat can be used as a parameter, or the first change rate of the return air superheat can be used as a parameter. In the process of judgment, there are two implementation processes, one of which is: on the basis that the first operating time is greater than or equal to the first preset time, the return air superheat is greater than or equal to zero for a second preset time, and then it can be judged that the return air superheat meets the first preset condition; the other is: on the basis that the first operating time is greater than or equal to the first preset time, the first change rate is greater than or equal to zero for a second preset time, and then it is judged that the return air superheat meets the first preset condition.

[0088] In an embodiment of the present invention, the second preset time is defined as t2, wherein 1min≤t2≤3min, that is, the second preset time t2 is set in [1min, 3min], so that the refrigerant is kept in a relatively small time range, thereby effectively shortening the waiting time on the basis of satisfying the requirements of drainage and frequency increase. The specific value of t2 can be 1min, 1.3min, 1.5min, 1.7min, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3min.

[0089] When the return air superheat meets the first preset condition, the control device 100 further controls the air conditioner 1000, wherein the operating frequency of the compressor 301 is increased so that the compressor 301 operates at the second preset frequency, and the opening of the electronic expansion valve 302 is controlled to increase so that it operates at the second liquid discharge opening. Based on this, the operating frequency of the compressor 301 can be increased on the basis of reducing the liquid hammer on the compressor 301, thereby realizing the rapid startup of the air conditioner 1000.

[0090] In an embodiment of the present invention, the second preset frequency is greater than the first preset frequency. For example, when the first preset frequency is 15 Hz, the second preset frequency may be 20 Hz, etc. In addition, the second drainage opening is greater than the first drainage opening. For example, when the first drainage opening is 50 steps, the second drainage opening is 60 steps, etc.

[0091] S40. According to whether the exhaust gas superheat degree satisfies the second preset condition, the compressor 301 is controlled to operate at a third preset frequency, wherein the third preset frequency is greater than the second preset frequency.

[0092] Specifically, on the basis of satisfying the first preset condition, the air conditioner 1000 needs to monitor the state of the air conditioner 1000, and judge the current state of the air conditioner 1000 according to the second preset condition, and perform further actions on the air conditioner 1000 according to the judgment result.

[0093] Furthermore, when the air conditioner 1000 operates at a second preset frequency and the electronic expansion valve 302 operates at a second liquid discharge opening, the exhaust superheat of the compressor 301 is calculated, wherein when the exhaust superheat of the compressor 301 is calculated, the exhaust temperature of the compressor 301 is collected by using the acquisition module 101 (temperature sensor), and the exhaust refrigerant pressure is collected by using the acquisition module 101 (pressure sensor), and the exhaust refrigerant pressure is used to obtain the refrigerant saturation temperature corresponding to the current refrigerant pressure (which can be obtained by looking up a table or by using the refrigerant pressure and refrigerant saturation curve), and then the refrigerant saturation temperature is subtracted from the exhaust refrigerant temperature. At this time, the difference between the two is the exhaust superheat.

[0094] When the exhaust gas superheat is used to judge the state of the air conditioner 1000, the exhaust gas superheat is compared with the first preset temperature. When the exhaust gas superheat is less than the first preset temperature, it indicates that the superheat of the compressor 301 cannot meet the demand for further frequency increase, and further liquid discharge operation is required. When the exhaust gas superheat is greater than the first preset temperature, it indicates that the current state of the compressor 301 can meet the demand for further frequency increase, and the frequency increase operation will not have an adverse effect on the compressor 301.

[0095] It should be pointed out that the first preset temperature is defined as T1, wherein the value of T1 can be 3°C, 4°C, 5°C, 6°C, 7°C, 8°C, 9°C, or 10°C.

[0096] Therefore, using the exhaust superheat to judge the current state of the air conditioner 1000 can improve the judgment accuracy of the air conditioner 1000, thereby improving the control accuracy of the air conditioner 1000, and further reducing the failure rate of the compressor 301, so that the service life of the compressor 301 can be effectively extended.

[0097] Furthermore, a second change rate of the exhaust superheat is calculated based on the exhaust superheat, and further judgment is made based on the exhaust superheat, the second change rate, the first preset temperature, the third preset time, the fourth preset time, the fifth preset time and the sixth preset time.

[0098] Among them, when the exhaust superheat is greater than the first preset temperature, the duration needs to meet the requirement of the third preset time length, that is, on the basis that the exhaust superheat is greater than the first preset temperature, the duration needs to be greater than or equal to the third preset time length, and at the same time, the second change rate needs to meet the requirement that the duration is greater than or equal to the fourth preset time length on the basis of being greater than or equal to zero. Based on this, it can be determined that the exhaust superheat meets the second preset condition, and on the basis of meeting the second preset condition, the compressor 301 is controlled to operate at the third preset frequency, wherein the third preset frequency is greater than the second preset frequency.

[0099] In an embodiment of the present invention, the third preset time is defined as t3, wherein 1min≤t3≤3min, that is, the third preset time t3 is set in [1min, 3min], so that the refrigerant is kept in a relatively small volatility time range, thereby effectively shortening the waiting time on the basis of satisfying the drainage and frequency increase. The specific value of t3 can be 1min, 1.3min, 1.5min, 1.7min, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3min.

[0100] In an embodiment of the present invention, the fourth preset time length is defined as t4, wherein 1min≤t4≤3min, that is, the fourth preset time length t4 is set in [1min, 3min], so that the refrigerant is kept in a relatively small time range, thereby effectively shortening the waiting time on the basis of satisfying the requirements of drainage and frequency increase. Among them, the specific value of t4 can be 1min, 1.3min, 1.5min, 1.7min, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3min.

[0101] Further, based on the exhaust superheat being less than the first preset temperature for a fifth preset time period and the second change rate being less than zero for a sixth preset time period, the air conditioner 1000 is controlled to enter the drainage mode until the second preset condition is met.

[0102] In an embodiment of the present invention, the fifth preset time length is defined as t5, wherein 1min≤t5≤5min, that is, the fifth preset time length t5 is set at [1min, 5min]. The specific value of t5 can be 1min, 1.3min, 1.5min, 1.7min, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3min, 3.5min, 3.8min, 4min, 4.5min, 5min.

[0103] In an embodiment of the present invention, the sixth preset duration is defined as t6, wherein t6≤1min, wherein the specific value of t6 can be 1min, 50s, 40s, 30s, 20s, 10s, or 5s.

[0104] When the exhaust gas superheat meets the second preset condition, the control device 100 further controls the air conditioner 1000, wherein the operating frequency of the compressor 301 is increased, so that the compressor 301 operates at a third preset frequency. Based on this, the operating frequency of the compressor 301 can be increased on the basis of reducing the liquid hammer on the compressor 301, thereby realizing the rapid startup of the air conditioner 1000.

[0105] In an embodiment of the present invention, the third preset frequency is greater than the second preset frequency, the third frequency is defined as N3, the second frequency is defined as N2, the compressor 301 has a maximum frequency Nmax and a minimum frequency Nmin, wherein N3 = N2 +

[0106] (Nmax-Nmin) / 3, the air conditioner 1000 operates at this frequency.

[0107] S50 , according to the exhaust gas superheat degree satisfying the third preset condition, controlling the air conditioner 1000 to switch to the normal working mode, and the electronic expansion valve 302 is controlled in the normal working mode.

[0108] Specifically, the air conditioner 1000 continues to operate at a frequency of N3=N2+(Nmax-Nmin) / 3, and the frequency is updated once a minute. The target frequency is N3L, and the current frequency is N3, then N3L=N3+(Nmax-Nmin) / 3, until the third preset condition is met, that is, the duration of the exhaust superheat being greater than or equal to the second preset temperature reaches the seventh preset duration, and the second change rate is greater than zero.

[0109] In an embodiment of the present invention, the seventh preset duration is defined as t7, wherein 10s≤t7≤180, wherein the specific value of t7 can be 10s, 20s, 30s, 40s, 50s, 60s, 70s, 80s, 90s, 100s, 110s, 120s, 130s, 140s, 150s, 160s, 170s, or 180s.

[0110] The following is a specific description using the specific air conditioner 1000 for heating as an example. Figure 2 As shown:

[0111] In the first stage: the system startup stage, the compressor 301 starts to run at a low frequency N1, and the electronic expansion valve 302 is opened with a small opening P1 (for example, the adjustment range of the electronic expansion valve 302 is 0-500 steps, then P1 can be preferably 40-60 steps). In this stage, the compressor 301 continuously discharges the liquid refrigerant to the indoor side. Since the opening of the electronic expansion valve 302 is small, the liquid discharge speed is much greater than the liquid return speed. When condition 1 is met, that is, the system continues to run for t1=2min, at this time, if the return air superheat Txh≥0℃ is met for t2=1min, or ΔTxh≥0 is met for 1min, it enters the next stage, otherwise it continues to stay in stage 1. The return air superheat and exhaust gas superheat are calculated every 5s.

[0112] In the second stage: Entering stage 2, the frequency of the compressor 301 rises to N2 (N2>N1), and the number of steps of the electronic expansion valve 302 is P2 (P2>P1). In the process of stage 2, when the left condition of stage 2 is met, that is, the exhaust superheat Tph≥5℃(T2) lasts for 1min(t3), and the exhaust superheat change rate ΔTph≥0 lasts for t4=1.5min, then exit stage 2 and enter stage 3. When the left condition of stage 2 is not met, it operates according to the right condition of stage 2, that is, when the system is in stage 2 for t5=2min, it still cannot exit stage 2, and Tph≤0℃(T3) lasts for 10s(t6), ΔTph<0, enters the drainage mode, and corrects the opening of the electronic expansion valve. The correction formula is: P2 目标 =P2 当前 -(P2 当前 -P1) / 3, until the left condition of stage 2 is met and then enter stage 3.

[0113] In the third stage: entering stage three, the compressor 301 further increases the frequency to N3=N2+(Nmax-Nmin) / 3, and continues the operation process. When condition 3 is not met, the frequency is updated once a minute, the target frequency is N3L, the current frequency is N3, then N3L=N3+(Nmax-Nmin) / 3, until condition 3 is met, that is, Tph≥10℃ for 30s (t7), and ΔTph>0, exiting the startup stage and entering the normal control operation of the system.

[0114] According to the control method of the air conditioner 1000 of the present invention, during the startup phase of the air conditioner 1000, when the operating parameters of the air conditioner 1000 meet the drainage conditions, the air conditioner 1000 is first controlled to drain the liquid, and then through the first preset condition, the second preset condition and the third preset condition, on the basis of draining the air conditioner 1000, the frequency of the air conditioner 1000 is increased in stages, thereby achieving a quick startup of the air conditioner 1000, reducing the liquid-carrying operation of the air conditioner 1000, and reducing the damage to the compressor 301 of the air conditioner 1000 caused by liquid shock.

[0115] The second aspect of the present invention proposes a control device 100 for an air conditioner 1000, which is used to implement the control method of the air conditioner 1000 as described above, and includes an acquisition module 101 and a control module 102. The acquisition module 101 is used to acquire the operating parameters of the air conditioner 1000, and the control module 102 is used to switch the mode of the air conditioner 1000, control the operating frequency of the air conditioner 1000, and control the opening of the electronic expansion valve 302.

[0116] A third aspect of the present invention provides an air conditioner 1000 , comprising the control device 100 of the air conditioner 1000 as described above.

[0117] A fourth aspect of the present invention provides a computer-readable storage medium 103 on which a computer program is stored. When the computer program is executed by a processor, the control method of the air conditioner 1000 as described above is implemented.

[0118] In this embodiment, examples of computer-readable storage media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM, Compact Disc Read-Only Memory). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program may be printed, because the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in other suitable ways as necessary, and then stored in a computer memory.

[0119] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices (systems) or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0120] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0121] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The control method of the air conditioner comprises: According to the air conditioner being started and the operating parameters satisfying the drainage condition, controlling the air conditioner to enter the drainage mode; According to the air conditioner entering the liquid discharge mode, controlling the compressor to operate at a first preset frequency, and controlling the electronic expansion valve to operate at a first liquid discharge opening; According to the return air superheat satisfying the first preset condition, controlling the compressor to operate at a second preset frequency, and controlling the electronic expansion valve to operate at a second liquid discharge opening, wherein the second preset frequency is greater than the first preset frequency, and the second liquid discharge opening is greater than the first liquid discharge opening; According to the exhaust gas superheat satisfying the second preset condition, controlling the compressor to operate at a third preset frequency, wherein the third preset frequency is greater than the second preset frequency; According to the exhaust gas superheat degree satisfying the third preset condition, the air conditioner is controlled to switch to the normal working mode, and the electronic expansion valve is controlled in the normal working mode.

2. The air conditioner control method according to claim 1, characterized in that: In the step of controlling the air conditioner to enter the liquid discharge mode according to the air conditioner being started and the operating parameters satisfying the liquid discharge condition, the method includes: Calculating the return air superheat of the compressor; Determining whether the return air superheat is greater than or equal to zero; According to the return air superheat being less than zero, it is determined that the air conditioner meets the liquid discharge condition, and the air conditioner is controlled to enter the liquid discharge mode.

3. The air conditioner control method according to claim 2, characterized in that: The step of calculating the return air superheat of the compressor includes: Get the return air refrigerant temperature; Get the return air refrigerant pressure; Obtaining a refrigerant saturation temperature corresponding to the return air refrigerant pressure; The difference between the refrigerant saturation temperature and the return air refrigerant temperature is calculated, and the difference is determined as the return air superheat.

4. The control method of the air conditioner according to claim 3, characterized in that: Before the step of controlling the compressor to operate at a second preset frequency and controlling the electronic expansion valve to operate at a second liquid discharge opening according to the return air superheat satisfying the first preset condition, wherein the second preset frequency is greater than the first preset frequency and the second liquid discharge opening is greater than the first liquid discharge opening, the method further includes: Obtaining a first operating time of the air conditioner; Calculating a first change rate of return air superheat according to the return air superheat and the first operation time; According to the first operating time reaching the first preset time, and the duration that the return air superheat is greater than or equal to zero reaches the second preset time, it is determined that the return air superheat meets the first preset condition; or, according to the first operating time reaching the first preset time, and the duration that the first change rate is greater than or equal to zero reaches the second preset time, it is determined that the return air superheat meets the first preset condition.

5. The air conditioner control method according to claim 4, characterized in that: The first preset time length is t1, where t1 is within the interval of 1min-3min; And / or, the second preset duration is t2, wherein t2 is within the interval of 1 min-3 min.

6. The air conditioner control method according to claim 1, characterized in that: Before the step of controlling the compressor to operate at a third preset frequency according to the exhaust gas superheat satisfying the second preset condition, wherein the third preset frequency is greater than the second preset frequency, the method further includes: calculating the exhaust superheat of the compressor; calculating a second rate of change of the exhaust gas superheat; According to the fact that the exhaust superheat degree is greater than the first preset temperature for a third preset time period and the second change rate is greater than or equal to zero for a fourth preset time period, it is determined that the exhaust superheat degree meets the second preset condition.

7. The air conditioner control method according to claim 6, characterized in that: After the step of determining that the exhaust gas superheat degree satisfies the second preset condition according to the exhaust gas superheat degree being greater than the first preset temperature for a continuous period of time reaching a third preset period of time, and the second change rate being greater than or equal to zero for a continuous period of time reaching a fourth preset period of time, the method further includes: According to the exhaust gas superheat being less than the first preset temperature for a continuous period reaching a fifth preset period, and the second change rate being less than zero for a continuous period reaching a sixth preset period, the air conditioner is controlled to enter the drainage mode.

8. The control method of the air conditioner according to claim 7, characterized in that: Before the step of controlling the air conditioner to switch to a normal working mode according to the exhaust gas superheat degree satisfying the third preset condition, and the electronic expansion valve being controlled in the normal working mode, the method further includes: According to the duration for which the exhaust superheat degree is greater than or equal to the second preset temperature reaching the seventh preset duration, and the second change rate being greater than zero, it is determined that the exhaust superheat degree meets the third preset condition.

9. The air conditioner control method according to claim 8, characterized in that: The third preset time length is t3, where t3 is within the interval of 1min-3min; And / or, the fourth preset time length is t4, wherein t4 is within the interval of 1 min-3 min; And / or, the fifth preset time length is t5, wherein t5 is within the interval of 1 min-5 min; And / or, the sixth preset time length is t6, wherein t6 is less than 1 minute; And / or, the seventh preset time length is t7, wherein t7 is in the interval of 10s-180s; And / or, the first preset temperature is T1, wherein T1 is less than or equal to 5°C.

10. A control device for an air conditioner, the control device being used to implement the control method for an air conditioner according to any one of claims 1 to 9, characterized in that: include: An acquisition module, the acquisition module is used to acquire the operating parameters of the air conditioner; A control module is used to switch the mode of the air conditioner, control the operating frequency of the air conditioner and control the opening degree of the electronic expansion valve.

11. An air conditioner, characterized in that: The invention comprises the control device of the air conditioner according to claim 10.

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

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