Temperature-reaching shutdown suppression control method and device of air conditioner and air conditioner

Abstract

The invention discloses a temperature-reaching shutdown suppression control method and device of an air conditioner and the air conditioner. The method comprises the steps that current environment parameters related to the indoor temperature corresponding to the air conditioner are obtained, the set temperature and the current set opening degree of the control valve corresponding to the current environment parameter are obtained from the corresponding relation between the pre-stored environment parameters and the opening degree of the control valve; determining a target opening degree of the control valve based on the current set opening degree; and the control valve is controlled to operate at the target opening degree, operation parameters of the air conditioner are obtained, and the value of the current set opening degree in the corresponding relation of the environment parameters and the control valve opening degree is updated based on the operation parameters. The refrigerant flow on the bypass loop can be more reasonable, the numerical value of the current set opening degree in the corresponding relation of the environment parameters and the opening degree of the control valve continues to be updated according to the operation parameters of the air conditioner in the state that the bypass loop is used, and the capacity of the air conditioner for restraining temperature-reaching shutdown is effectively improved; and the comfort of the indoor environment temperature is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a method and device for suppressing temperature-reaching shutdown control of an air conditioner, and the air conditioner. Background Art

[0002] Air conditioners usually perform temperature-sensitive shutdown control when operating at low loads. However, when the air conditioner is restarted after a temperature-sensitive shutdown, it usually takes a certain amount of startup time to reach the required output capacity, which can easily cause the indoor temperature to fluctuate in a short period of time, affecting the indoor temperature comfort. The current air conditioner temperature-sensitive shutdown suppression control technology usually passes part of the exhaust refrigerant through a bypass loop into the suction side of the compressor to suppress the cooling or heating capacity of the air conditioner, thereby suppressing the number of temperature-sensitive shutdowns. However, the refrigerant flow rate passed into the bypass loop is usually a set value. When the refrigerant flow rate passed into the bypass loop is too much, it is easy to cause the cooling or heating capacity of the air conditioner to be insufficient. When the refrigerant flow rate passed into the bypass loop is too little, it cannot effectively suppress the temperature-sensitive shutdown. Therefore, the current air conditioner temperature-sensitive shutdown suppression control technology still has the problem of insufficient temperature-sensitive shutdown suppression capacity, which affects the indoor ambient temperature comfort. Summary of the Invention

[0003] To solve the above problems, the present invention provides a method, device and air conditioner for suppressing temperature-induced shutdown control of an air conditioner, which can make the refrigerant flow on the bypass circuit more reasonable, effectively improve the ability of the air conditioner to suppress temperature-induced shutdown, and improve the comfort of the indoor ambient temperature.

[0004] According to an embodiment of the present invention, a method for suppressing temperature-induced shutdown of an air conditioner is provided. The method is applied to an air conditioner, wherein the air conditioner includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor, a four-way valve, and a control valve, and the indoor unit includes a heat exchanger. The control valve is disposed in a bypass loop, a first end of the bypass loop is connected between the compressor and the four-way valve, and a second end of the bypass loop is connected between the heat exchanger and the compressor. The method includes:

[0005] Acquire a current environmental parameter related to the indoor temperature corresponding to the air conditioner, and acquire a set temperature and a current set opening of the control valve corresponding to the current environmental parameter from a pre-stored correspondence between the environmental parameter and the control valve opening;

[0006] determining a target opening of the control valve based on the current set opening;

[0007] The control valve is controlled to operate at the target opening, an operating parameter of the air conditioner is obtained, and a value of the currently set opening in the correspondence between the environmental parameter and the control valve opening is updated based on the operating parameter.

[0008] By adopting the above technical solution, the current set opening that meets the current environmental parameters is obtained from the pre-stored correspondence between the environmental parameters and the control valve opening according to the current environmental parameters, and the target opening of the control valve on the bypass loop is determined according to the current set opening, so that the refrigerant flow on the bypass loop can be made more reasonable. By continuously updating the value of the current set opening in the correspondence between the environmental parameters and the control valve opening according to the operating parameters of the air conditioner while using the bypass loop, the opening setting of the control valve under the same subsequent environmental conditions can be made more reasonable, effectively improving the ability of the air conditioner to suppress temperature shutdown and improving the comfort of the indoor ambient temperature.

[0009] Preferably, the environmental parameters include any one or more parameters of outdoor ambient temperature, number of people indoors, activity level, indoor wind speed, sunshine and ventilation volume;

[0010] and / or,

[0011] The correspondence between the environmental parameters and the control valve opening comprises a multi-dimensional matrix consisting of the set temperature, the environmental parameters and the set opening of the control valve.

[0012] By adopting the above technical solution, parameters affecting indoor temperature, such as the number of people indoors, activity level, indoor wind speed, sunlight and ventilation volume, are added to the environmental parameters, and a multidimensional matrix of environmental parameters, set temperature and control valve opening is constructed. This increases the number of matrix elements that determine the control valve opening, and improves the rationality of the control valve opening setting of the bypass loop.

[0013] Preferably, the step of determining the target opening of the control valve based on the current set opening includes:

[0014] Get the current operating frequency, maximum operating frequency and minimum operating frequency of the compressor;

[0015] The target opening of the control valve is determined based on the current set opening, the current operating frequency, the maximum operating frequency, and the minimum operating frequency; wherein the target opening is positively correlated with the current set opening.

[0016] By adopting the above technical solution, the target opening of the control valve is determined according to the current set opening and the current operating frequency of the compressor, so that the flow of the bypass circuit matches the operating conditions of the air conditioner and the current corresponding environmental parameters of the air conditioner, thereby avoiding the refrigerant flow of the bypass circuit being too small to effectively suppress the temperature shutdown, and at the same time avoiding the refrigerant flow of the bypass circuit being too large to meet the cooling or heating needs, thereby improving the reliability of the air conditioner operation.

[0017] Preferably, the target opening of the control valve is calculated as follows: PT = PL × (FMid - FRel) / (FMid - FMin);

[0018] Wherein, PT is the target opening, PL is the current set opening, FRel is the current operating frequency, FMid is the maximum operating frequency, and FMin is the minimum operating frequency.

[0019] Preferably, the operating parameters of the air conditioner include the operating frequency of the compressor and the change in the suction temperature of the indoor unit.

[0020] By adopting the above technical solution, after the control valve operates at the target opening, the operating frequency of the compressor and the change in the suction temperature of the indoor unit are obtained, so as to detect whether there is a problem of excessive suppression of the air conditioner capacity, and then judge whether the current target opening of the control valve and the current set opening obtained are appropriate, so as to provide a data basis for updating the set opening of the control valve in the correspondence between the environmental parameters and the control valve opening.

[0021] Preferably, the step of obtaining the operating parameters of the air conditioner and updating the value of the currently set opening in the correspondence between the environmental parameters and the control valve opening based on the operating parameters includes:

[0022] When the air conditioner enters the temperature-reaching shutdown control, the intake temperature change within a first preset time period before the air conditioner enters the temperature-reaching shutdown control is obtained, and the adjustment amount of the currently set opening is determined based on the intake temperature change.

[0023] By adopting the above technical solution, the change in the indoor unit's intake temperature before entering the temperature shutdown control is adjusted to adjust the unreasonable value of the control valve's set opening, so that the control valve's set opening recorded in the corresponding relationship between the environmental parameters and the control valve opening is more reasonable.

[0024] Preferably, the temperature-reaching shutdown suppression control method further includes:

[0025] monitoring the operating frequency of the compressor, and when the operating frequency of the compressor is continuously not equal to the minimum operating frequency for a second preset time period, and a change in the suction temperature of the indoor unit in cooling mode is greater than or equal to a first preset threshold, controlling the currently set opening to be lowered by a first preset opening;

[0026] When the operating frequency of the compressor is continuously not equal to the minimum operating frequency within a second preset time period, and the change in the suction temperature of the indoor unit in the heating mode is less than or equal to a second preset threshold, the currently set opening degree is controlled to be reduced by a second preset opening degree.

[0027] By adopting the above technical solution, it is monitored whether the operating frequency of the compressor is continuously not equal to the minimum operating frequency for a period of time, and whether the change in the indoor unit meets the threshold requirement, so as to determine whether there is a problem of excessive suppression of air-conditioning capacity. By reducing the current set opening of the control valve when suppressing excessive air-conditioning capacity, the degree of suppression of air-conditioning capacity is reduced, thereby reducing the operating frequency of the compressor.

[0028] Preferably, the step of determining the adjustment amount of the currently set opening based on the change in the intake air temperature includes:

[0029] If the absolute value of the intake air temperature change is greater than zero and less than or equal to a first change threshold, controlling the currently set opening to increase by a first opening;

[0030] If the absolute value of the intake air temperature change is greater than the first change threshold and less than or equal to a second change threshold, controlling the currently set opening to increase by a second opening; wherein the second opening is greater than the first opening;

[0031] If the absolute value of the intake air temperature change is greater than the second change threshold, the currently set opening is controlled to increase by a third opening; wherein the third opening is greater than the second opening.

[0032] By adopting the above technical solution, the change in the indoor unit's intake temperature is obtained, and the degree to which the target opening of the control valve is insufficient to suppress the temperature reaching capacity can be indirectly detected. When the absolute value of the intake temperature change is large, the current set opening of the control valve in the corresponding relationship between the control environment parameter and the control valve opening is increased by a larger value; when the absolute value of the intake temperature change is small, the current set opening of the control valve in the corresponding relationship between the control environment parameter and the control valve opening is increased by a smaller value. The reasonable increase in the current set opening of the control valve can be determined, so that the set opening of the control valve in the corresponding relationship between the environmental parameter and the control valve opening is more reasonable, and at the same time, the ability to suppress temperature reaching shutdown can be achieved.

[0033] According to another aspect of an embodiment of the present invention, a temperature-induced shutdown suppression control device for an air conditioner is provided. The device is applied to an air conditioner, wherein the air conditioner includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor, a four-way valve, and a control valve, the indoor unit includes a heat exchanger, the control valve is disposed in a bypass loop, a first end of the bypass loop is connected between the compressor and the four-way valve, and a second end of the bypass loop is connected between the heat exchanger and the compressor, and the temperature-induced shutdown suppression control device includes:

[0034] an acquisition module, configured to acquire current environmental parameters related to the indoor temperature corresponding to the air conditioner, and to acquire a set temperature and a current set opening of the control valve corresponding to the current environmental parameters from a pre-stored correspondence between environmental parameters and control valve openings;

[0035] a determination module, configured to determine a target opening of the control valve based on the currently set opening;

[0036] An updating module is used to control the control valve to operate at the target opening, obtain the operating parameters of the air conditioner, and update the value of the currently set opening in the correspondence between the environmental parameters and the control valve opening based on the operating parameters.

[0037] According to an embodiment of the present invention, another aspect provides an air conditioner, comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, implements the method according to any one of the first aspects.

[0038] The present invention has the following beneficial effects: by obtaining the current set opening that meets the current environmental parameters from the pre-stored correspondence between the environmental parameters and the control valve opening according to the current environmental parameters, and determining the target opening of the control valve on the bypass loop according to the current set opening, the refrigerant flow on the bypass loop can be made more reasonable; by continuously updating the value of the current set opening in the correspondence between the environmental parameters and the control valve opening according to the operating parameters of the air conditioner while using the bypass loop, the opening setting of the control valve under the same subsequent environmental conditions can be made more reasonable, effectively improving the ability of the air conditioner to suppress temperature shutdown and improving the comfort of the indoor ambient temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0040] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0041] Figure 1 A flow chart of a temperature-reaching shutdown suppression control method for an air conditioner provided by the present invention;

[0042] Figure 2 A schematic structural diagram of an air conditioner provided by the present invention;

[0043] Figure 3 A schematic diagram of a multi-dimensional matrix provided by the present invention;

[0044] Figure 4 A schematic diagram of updating the current setting opening provided by the present invention;

[0045] Figure 5 A flow chart of a temperature-reaching shutdown suppression control method provided by the present invention;

[0046] Figure 6 This is a structural schematic diagram of a temperature-reaching shutdown suppression control device for an air conditioner provided by the present invention. DETAILED DESCRIPTION

[0047] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0049] This embodiment provides a method for controlling temperature-reaching shutdown suppression of an air conditioner. The method can be applied to an air conditioner. Figure 1 The flow chart of the temperature-reaching shutdown suppression control method of the air conditioner shown in FIG. 1 mainly includes the following steps S102 to S106:

[0050] Step S102: obtaining current environmental parameters related to the indoor temperature corresponding to the air conditioner, and obtaining the set temperature and the current set opening of the control valve corresponding to the current environmental parameters from the pre-stored correspondence between the environmental parameters and the control valve opening;

[0051] See for example Figure 2 The air conditioner structure diagram shown in the figure, the air conditioner provided in this embodiment includes an indoor unit 10 and an outdoor unit 20, the outdoor unit 20 includes a compressor 21, a four-way valve 22 and a control valve 23, the indoor unit 10 includes a heat exchanger 11, and the control valve 23 is provided in a bypass loop, the first end of the bypass loop is connected between the exhaust pipe of the compressor 21 and the four-way valve 22, and the second end of the bypass loop is connected between the heat exchanger 11 of the indoor unit 10 and the compressor 21. Figure 2 As shown, the outdoor unit 20 further includes a heat exchanger 24 , a capillary tube 25 , a service liquid valve 26 and a service gas valve 27 .

[0052] The control valve may be an electronic valve such as a solenoid valve or an electronic expansion valve. The current environmental parameter may be a parameter that has a significant impact on the indoor ambient temperature. In one embodiment, the current environmental parameter may include any one or more parameters selected from the group consisting of outdoor ambient temperature, number of people indoors, activity level, indoor wind speed, sunshine intensity, and ventilation volume.

[0053] The above-mentioned outdoor ambient temperature can be detected by a temperature sensor installed outdoors, the number of people indoors can be detected by an image sensor or thermopile installed on the indoor unit, the above-mentioned activity amount can be calculated based on the thermopile installed in the indoor unit or based on the indoor temperature, the above-mentioned indoor wind speed can be obtained by predicting the average indoor wind speed based on the image sensor installed on the indoor unit and the fan speed of the indoor unit, the above-mentioned sunshine amount can be calculated based on the illumination sensor installed in the indoor unit to obtain the sunshine amount entering the room, and the above-mentioned ventilation amount can be determined based on the speed of the ventilation fan.

[0054] In one embodiment, the correspondence between the environmental parameters and the control valve opening provided in this embodiment includes a multi-dimensional matrix consisting of the set temperature, the environmental parameters, and the set opening of the control valve.

[0055] Considering that the more people and activities there are indoors, the more heat is generated, resulting in a higher load on the air conditioner, so the set opening of the control valve can be inversely correlated with the number of people indoors, that is, the more people there are indoors, the larger the set opening of the control valve.

[0056] For example, assuming that the above-mentioned environmental parameters include the outdoor ambient temperature, refer to the corresponding relationship table of environmental parameters and control valve openings shown in Table 1 below. Table 1 below shows the set openings of the control valve corresponding to different set temperature ranges and outdoor ambient temperature ranges in the cooling mode:

[0057] Table 1 Correspondence between environmental parameters and control valve opening

[0058]

[0059]

[0060] For example, it is assumed that the above environmental parameters include outdoor ambient temperature and number of people indoors, see Figure 3 The multidimensional matrix shown in the figure is composed of control valve opening data corresponding to the set temperature, outdoor ambient temperature, and number of people indoors within various parameter ranges. For example, any parameter such as activity level, indoor wind speed, sunlight, and ventilation volume can be added to the multidimensional matrix to form a 4-dimensional matrix to determine the control valve opening.

[0061] The correspondence between the above-mentioned environmental parameters and the control valve opening can be pre-stored in the controller of the outdoor unit. During the operation of the air conditioner, the current environmental parameters related to the indoor temperature of the air conditioner are obtained, and the current set temperature and the set opening of the control valve corresponding to the current environmental parameters are obtained from the stored correspondence between the environmental parameters and the control valve opening, which are recorded as the current set opening.

[0062] Step S104: determining the target opening of the control valve based on the current set opening;

[0063] Based on the current set opening of the control valve obtained from the pre-stored correspondence between the environmental parameters and the control valve opening, the target opening of the control valve under the current environmental parameters is determined.

[0064] In one embodiment, the current operating frequency, maximum operating frequency and minimum operating frequency of the compressor are obtained; the target opening of the control valve is determined based on the current set opening, the current operating frequency, the maximum operating frequency and the minimum operating frequency; wherein the target opening is positively correlated with the current set opening, that is, the larger the current set opening of the control valve, the larger the calculated target opening of the control valve.

[0065] By determining the target opening of the control valve based on the current set opening and the current operating frequency of the compressor, the refrigerant flow in the bypass circuit is matched with the operating conditions of the air conditioner and the current corresponding environmental parameters of the air conditioner. This avoids the refrigerant flow in the bypass circuit being too small to effectively suppress temperature shutdown, and at the same time avoids the refrigerant flow in the bypass circuit being too large to meet cooling or heating needs, thereby improving the reliability of the air conditioner operation.

[0066] In a specific embodiment, the target opening of the control valve is calculated as follows: PT = PL × (FMid - FRel) / (FMid - FMin);

[0067] Among them, PT is the target opening, PL is the current set opening, FRel is the current operating frequency, FMid is the maximum operating frequency, and FMin is the minimum operating frequency.

[0068] The above-mentioned maximum operating frequency and minimum operating frequency are the frequency limits set for the air conditioner in cooling or heating mode. For example, the maximum operating frequency can be 35-45 [Hz], preferably 40 [Hz], and the minimum operating frequency can be 15-25 [Hz], preferably 20 [Hz].

[0069] Step S106: Control the control valve to operate at the target opening, obtain the operating parameters of the air conditioner, and update the value of the current set opening in the correspondence between the environmental parameters and the control valve opening based on the operating parameters.

[0070] The control valve of the bypass loop is operated at the target opening obtained by the above calculation. After the control valve is operated at the above target opening, the operating parameters of the air conditioner are monitored, and the current set opening obtained from the above correspondence between the environmental parameters and the control valve opening is updated according to the operating parameters of the air conditioner, so that the set opening of the control valve in the correspondence between the environmental parameters and the control valve opening can be updated to a more appropriate value, thereby improving the rationality of the control valve opening control in the bypass loop and improving the comfort of the indoor environment.

[0071] The temperature-induced shutdown suppression control method for the air conditioner provided in this embodiment obtains the current set opening that meets the current environmental parameters from the pre-stored correspondence between environmental parameters and the control valve opening according to the current environmental parameters, and determines the target opening of the control valve on the bypass loop according to the current set opening, thereby making the refrigerant flow on the bypass loop more reasonable. By continuously updating the value of the current set opening in the correspondence between environmental parameters and the control valve opening according to the operating parameters of the air conditioner while using the bypass loop, the opening setting of the control valve under the same subsequent environmental conditions can be made more reasonable, thereby effectively improving the ability of the air conditioner to suppress temperature-induced shutdown and improving the comfort of the indoor ambient temperature.

[0072] In one embodiment, the operating parameters of the air conditioner provided herein include the operating frequency of the compressor and the change in the indoor unit's intake air temperature. By obtaining the compressor operating frequency and the change in the indoor unit's intake air temperature after the control valve is operating at a target opening, it is possible to detect whether the air conditioner is over-capacitated and, further, determine whether the current target opening of the control valve and the obtained currently set opening are appropriate. This provides a data basis for updating the set opening of the control valve in the correspondence between environmental parameters and control valve openings.

[0073] In one embodiment, this embodiment provides an implementation for obtaining operating parameters of the air conditioner and updating the value of the currently set opening in the correspondence between the environmental parameter and the control valve opening based on the operating parameters. Specifically, the implementation can refer to the following steps:

[0074] Step (1): When the air conditioner enters the temperature-reaching shutdown control, obtain the intake temperature change within a first preset time period before the air conditioner enters the temperature-reaching shutdown control, and determine the adjustment amount of the current set opening based on the intake temperature change.

[0075] The first preset time period may range from 2 to 8 minutes, preferably 5 minutes.

[0076] When it is detected that the air conditioner enters the temperature-reaching shutdown control, it indicates that the current set opening of the control valve cannot effectively suppress the temperature-reaching shutdown. The suction temperature change of the indoor unit for the first preset period of time before the air conditioner enters the temperature-reaching shutdown control is obtained. According to the suction temperature change of the indoor unit before entering the temperature-reaching shutdown control, the unreasonable value of the set opening of the control valve is adjusted to make the set opening of the control valve recorded in the correspondence between the environmental parameters and the control valve opening more reasonable.

[0077] In a specific embodiment, if the absolute value of the intake temperature change is greater than zero and less than or equal to a first change threshold, the current set opening is controlled to increase the first opening; the value range of the first change threshold can be 0.1~0.3℃, preferably 0.2℃, and the value range of the first opening can be 0~3pls, preferably 1pls.

[0078] If the absolute value of the intake temperature change is greater than the first change threshold and less than or equal to the second change threshold, the current set opening is controlled to increase the second opening; the second opening is greater than the first opening; the value range of the above-mentioned second change threshold can be 0.2~0.7℃, preferably 0.5℃, and the value range of the second opening can be 2-8pls, preferably 5pls.

[0079] If the absolute value of the change in intake temperature is greater than the second change threshold, the current opening is controlled to increase by a third opening; the third opening is greater than the second opening. The third opening can be in the range of 7-13 pls, preferably 10 pls.

[0080] When the air conditioner enters the temperature-reaching shutdown control, it indicates that the target opening of the control valve in the current bypass loop still has the problem of insufficient ability to suppress the temperature reaching. By obtaining the change in the indoor unit's intake temperature, the degree to which the target opening of the control valve is insufficient in suppressing the temperature reaching can be indirectly detected. When the absolute value of the intake temperature change is large, that is, when the degree to which the target opening of the control valve is insufficient in suppressing the temperature reaching is large, the current set opening of the control valve in the corresponding relationship between the control environment parameter and the control valve opening is increased by a larger value; when the absolute value of the intake temperature change is small, that is, when the degree to which the target opening of the control valve is insufficient in suppressing the temperature reaching is small, the current set opening of the control valve in the corresponding relationship between the control environment parameter and the control valve opening is increased by a smaller value. The reasonable increase in the current set opening of the control valve can be determined, so that the set opening of the control valve in the corresponding relationship between the environmental parameter and the control valve opening is more reasonable, and at the same time, the ability to suppress the temperature reaching shutdown can be achieved.

[0081] For example, in cooling mode, the environmental parameters include the outdoor ambient temperature and the number of people indoors. The outdoor ambient temperature is 30°C, the set temperature is 25°C, and the number of people indoors is 4. Figure 3As shown in FIG, under the current environmental parameters, the current setting opening of the control valve is 60 pls. After the control valve is operated at the calculated target opening, if the change in the indoor unit suction temperature ⊿Tof = -0.4 [℃] 5 minutes before the air conditioner enters, the current setting opening of 60 pls is controlled to increase by a second opening of 5 pls. See FIG. Figure 4 The current setting opening update schematic diagram shown in the figure updates the current setting opening of 60pls to 65pls when the outdoor ambient temperature is 30°C, the set temperature is 25°C, and the number of people indoors is 4.

[0082] Step (2): Monitor the operating frequency of the compressor. When the operating frequency of the compressor is continuously not equal to the minimum operating frequency within a second preset time period, and the change in the suction temperature of the indoor unit in the cooling mode is greater than or equal to the first preset threshold, control the current set opening to reduce the first preset opening; when the operating frequency of the compressor is continuously not equal to the minimum operating frequency within the second preset time period, and the change in the suction temperature of the indoor unit in the heating mode is less than or equal to the second preset threshold, control the current set opening to reduce the second preset opening.

[0083] The second preset time period may range from 5 to 15 minutes, preferably 10 minutes. The first preset threshold may range from -0.1 to -0.3°C, preferably -0.1°C. The first preset opening may range from 2 to 8 pls, preferably 5 pls.

[0084] The second preset threshold may be in the range of 0.1-0.3° C., preferably 0.1° C. The second preset opening may be in the range of 2-8 pls, preferably 5 pls. The first preset opening may be equal to or different from the second preset opening.

[0085] By monitoring whether the operating frequency of the compressor is continuously different from the minimum operating frequency for a period of time and whether the change in the indoor unit meets the threshold requirements, it is determined whether there is a problem of excessive suppression of air conditioning capacity. By reducing the current set opening of the control valve when excessive air conditioning capacity is suppressed, the degree of air conditioning capacity suppression is reduced and the operating frequency of the compressor is lowered.

[0086] For example, assuming the second preset duration is 10 minutes and the first preset threshold is -0.1, in cooling mode, the compressor operating frequency is continuously different from the minimum operating frequency for the second preset duration. At time A, the indoor unit's suction temperature is 26.5°C. Ten minutes later, the indoor unit's suction temperature is 25.7°C. The absolute value of the change in the indoor unit's suction temperature is 0.8°C, which does not meet the condition that the absolute value of the change in the indoor unit's suction temperature is less than or equal to the preset threshold.

[0087] In cooling mode, the compressor operating frequency remains different from the minimum operating frequency for a second preset duration. At time B, the indoor unit's suction temperature is 26.5°C. Ten minutes later, the indoor unit's suction temperature is 26.6°C, and the change in the indoor unit's suction temperature is 0.1°C. This satisfies the condition that the change in the indoor unit's suction temperature is greater than or equal to the first preset threshold. Consequently, the currently set opening is controlled to be lowered by the first preset opening.

[0088] For example, assuming the second preset duration is 10 minutes and the first preset threshold is -0.1, in heating mode, the compressor operating frequency is continuously different from the minimum operating frequency for the second preset duration. At time C, the indoor unit's suction temperature is 20.5°C. Ten minutes later, the indoor unit's suction temperature is 21.7°C. The absolute value of the change in the indoor unit's suction temperature is +1.2°C, exceeding the second preset threshold.

[0089] In heating mode, the compressor operating frequency remains different from the minimum operating frequency for a second preset duration. At time D, the indoor unit's suction temperature is 20.5°C. Ten minutes later, the indoor unit's suction temperature is 22.3°C. The absolute value of the change in the indoor unit's suction temperature is -0.2°C, satisfying the requirement that the change in the suction temperature is less than or equal to the second preset threshold. Therefore, the current set opening is controlled to be lowered by the second preset opening.

[0090] In one embodiment, the reduction and increase of the currently set opening can be calculated in the indoor unit and transmitted to the outdoor unit to update the corresponding data in the correspondence between the environmental parameters and the control valve opening. The reduction and increase of the currently set opening can also be calculated in the outdoor unit and the corresponding data in the correspondence between the environmental parameters and the control valve opening can be updated.

[0091] The temperature-reaching shutdown suppression control method of the above-mentioned air conditioner provided in this embodiment updates the set opening in the multidimensional matrix according to the operating conditions of the air conditioner to adjust the expansion valve opening to meet the set environmental conditions, thereby rationalizing the bypass flow; when the temperature-reaching shutdown cannot be suppressed when operating at the target opening in the case of refrigeration operation, the set opening of the control valve in the multidimensional matrix is increased because the bypass capacity control is too small; when the room temperature is stable before the compressor reaches the minimum frequency, the bypass capacity suppression is too large, and the set opening value of the control valve in the multidimensional matrix is reduced, so that when the same environmental conditions occur subsequently, a more reasonable set opening value of the control valve can be determined.

[0092] Corresponding to the temperature-reaching shutdown suppression control method for the air conditioner provided in the above embodiment, the embodiment of the present invention provides an example of applying the temperature-reaching shutdown suppression control method for the air conditioner, see Figure 5 The flow chart of the temperature-reaching shutdown suppression control method shown in FIG. 3 may be specifically performed with reference to the following steps S501 to S504:

[0093] Step S501: During the operation of the air conditioner, current environmental parameters are obtained, and the current set opening of the expansion valve corresponding to the current environmental parameters is obtained from a multidimensional matrix;

[0094] Step S502, determining a target opening of the expansion valve according to the current set opening of the expansion valve;

[0095] Step S503, controlling the expansion valve to operate at a target opening;

[0096] Step S504: update the value of the currently set opening in the multidimensional matrix according to the operating status of the air conditioner, and return to execute the above step S501 to periodically update the multidimensional matrix.

[0097] Update the current set opening in the multidimensional matrix according to the operating status of the air conditioner:

[0098] In cooling mode:

[0099] When entering the temperature-reaching shutdown control, obtain the indoor unit's suction air temperature change ⊿Tof 5 minutes before entering the temperature-reaching shutdown control;

[0100] (a) When ⊿Tof<-0.5[℃], the current setting opening in the control multidimensional matrix is +10[pls];

[0101] (b) When -0.5[℃]≤⊿Tof<-0.2[℃], the current setting opening in the control multidimensional matrix is +5[pls];

[0102] (c) When -0.2[℃]≤⊿Tof<0, the current setting opening in the control multidimensional matrix is +1[pls];

[0103] When the compressor operating frequency FRel≠FMin (minimum operating frequency) lasts for more than 10 minutes and the indoor unit suction temperature changes by more than -0.1°C, the current set opening in the multi-dimensional matrix is controlled to -5 pls.

[0104] In heating mode:

[0105] When entering the temperature-reaching shutdown control, obtain the indoor unit's suction temperature change ⊿Toff 5 minutes before entering the temperature-reaching shutdown control;

[0106] (a) When 0.5[℃]<⊿Toff, the current setting opening in the multidimensional matrix is controlled to be +10[pls];

[0107] (b) When 0.2[℃]<⊿Toff≤0.5[℃], the current setting opening in the control multidimensional matrix is +5[pls];

[0108] (c) When 0[℃]<⊿Toff≤0.2[℃], the current setting opening in the control multidimensional matrix is +1[pls];

[0109] When the compressor operating frequency FRel≠FMin lasts for more than 10 minutes and the indoor unit suction temperature changes by less than 0.1[℃], the current set opening in the multi-dimensional matrix is controlled to -5[pls].

[0110] Corresponding to the temperature-reaching shutdown suppression control method for an air conditioner provided in the above embodiment, an embodiment of the present invention provides a temperature-reaching shutdown suppression control device for an air conditioner, which can be applied to an air conditioner, wherein the air conditioner includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor, a four-way valve and a control valve, the indoor unit includes a heat exchanger, the control valve is arranged in a bypass loop, the first end of the bypass loop is connected between the compressor and the four-way valve, and the second end of the bypass loop is connected between the heat exchanger and the compressor, see FIG. Figure 6 The structure diagram of the temperature-reaching shutdown suppression control device of the air conditioner shown in the figure includes the following modules:

[0111] An acquisition module 61 is used to acquire the current environmental parameters related to the indoor temperature corresponding to the air conditioner, and to acquire the set temperature and the current set opening of the control valve corresponding to the current environmental parameters from the pre-stored correspondence between the environmental parameters and the control valve opening;

[0112] A determination module 62 is configured to determine a target opening of the control valve based on a current set opening;

[0113] The updating module 63 is used to control the control valve to operate at a target opening, obtain the operating parameters of the air conditioner, and update the value of the current set opening in the correspondence between the environmental parameters and the control valve opening based on the operating parameters.

[0114] The temperature-induced shutdown suppression control device for the air conditioner provided in this embodiment obtains the current set opening that meets the current environmental parameters from the pre-stored correspondence between the environmental parameters and the control valve opening according to the current environmental parameters, and determines the target opening of the control valve on the bypass loop according to the current set opening, thereby making the refrigerant flow on the bypass loop more reasonable. By continuously updating the value of the current set opening in the correspondence between the environmental parameters and the control valve opening according to the operating parameters of the air conditioner while using the bypass loop, the opening setting of the control valve under the same subsequent environmental conditions can be made more reasonable, thereby effectively improving the ability of the air conditioner to suppress temperature-induced shutdown and improving the comfort of the indoor ambient temperature.

[0115] The device provided in this embodiment has the same implementation principle and technical effects as those of the aforementioned embodiments. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0116] Corresponding to the temperature-reaching shutdown suppression control method for the air conditioner provided in the above embodiment, this embodiment provides an air conditioner, which includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the temperature-reaching shutdown suppression control method for the air conditioner provided in the above embodiment is implemented.

[0117] The above-mentioned air conditioner includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor, a four-way valve and a control valve, the indoor unit includes a heat exchanger, the control valve is arranged in a bypass loop, the first end of the bypass loop is connected between the compressor and the four-way valve, and the second end of the bypass loop is connected between the heat exchanger and the compressor.

[0118] This embodiment further provides a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements the various processes of the above-described embodiment of the air conditioner temperature-reaching shutdown suppression control method, achieving the same technical effects. To avoid repetition, the description is omitted here. The computer-readable storage medium may be, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0119] Of course, those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the control device through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the above-mentioned method embodiments, wherein the storage medium may be a memory, a disk, an optical disk, etc.

[0120] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

[0121] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0122] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from the other embodiments. Reference will be made to the corresponding similarities between the various embodiments. Regarding the temperature-reaching shutdown suppression control device and air conditioner disclosed in the embodiments, since they correspond to the temperature-reaching shutdown suppression control method for the air conditioner disclosed in the embodiments, the description is relatively simple. For relevant details, refer to the method description.

[0123] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0124] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A method for suppressing temperature-reaching shutdown of an air conditioner, characterized in that: The invention is applied to an air conditioner, the air conditioner including an indoor unit and an outdoor unit, the outdoor unit including a compressor, a four-way valve, and a control valve, the indoor unit including a heat exchanger, the control valve being arranged in a bypass loop, the first end of the bypass loop being connected between the compressor and the four-way valve, and the second end of the bypass loop being connected between the heat exchanger and the compressor, the temperature-reaching shutdown suppression control method comprising: Acquire a current environmental parameter related to the indoor temperature corresponding to the air conditioner, and acquire a set temperature and a current set opening of the control valve corresponding to the current environmental parameter from a pre-stored correspondence between the environmental parameter and the control valve opening; determining a target opening of the control valve based on the current set opening; The control valve is controlled to operate at the target opening, an operating parameter of the air conditioner is obtained, and a value of the currently set opening in the correspondence between the environmental parameter and the control valve opening is updated based on the operating parameter.

2. The temperature-reaching shutdown suppression control method according to claim 1, characterized in that: The environmental parameters include any one or more parameters of outdoor ambient temperature, number of people indoors, activity level, indoor wind speed, sunshine and ventilation volume; and / or, The correspondence between the environmental parameters and the control valve opening comprises a multi-dimensional matrix consisting of the set temperature, the environmental parameters and the set opening of the control valve.

3. The temperature-reaching shutdown suppression control method according to claim 1, characterized in that: The step of determining the target opening of the control valve based on the current set opening comprises: Get the current operating frequency, maximum operating frequency and minimum operating frequency of the compressor; The target opening of the control valve is determined based on the current set opening, the current operating frequency, the maximum operating frequency, and the minimum operating frequency; wherein the target opening is positively correlated with the current set opening.

4. The temperature-reaching shutdown suppression control method according to claim 3, characterized in that: The target opening of the control valve is calculated as follows: PT = PL × (FMid - FRel) / (FMid - FMin); Wherein, PT is the target opening, PL is the current set opening, FRel is the current operating frequency, FMid is the maximum operating frequency, and FMin is the minimum operating frequency.

5. The temperature-reaching shutdown suppression control method according to claim 1, characterized in that: The operating parameters of the air conditioner include the operating frequency of the compressor and the change in the suction temperature of the indoor unit.

6. The temperature-reaching shutdown suppression control method according to claim 1, characterized in that: The step of obtaining the operating parameters of the air conditioner and updating the value of the currently set opening in the correspondence between the environmental parameters and the control valve opening based on the operating parameters includes: When the air conditioner enters the temperature-reaching shutdown control, the intake temperature change within a first preset time period before the air conditioner enters the temperature-reaching shutdown control is obtained, and the adjustment amount of the currently set opening is determined based on the intake temperature change.

7. The temperature-reaching shutdown suppression control method according to claim 6, characterized in that: Also includes: monitoring the operating frequency of the compressor, and when the operating frequency of the compressor is continuously not equal to the minimum operating frequency for a second preset time period, and a change in the suction temperature of the indoor unit in cooling mode is greater than or equal to a first preset threshold, controlling the currently set opening to be lowered by a first preset opening; When the operating frequency of the compressor is continuously not equal to the minimum operating frequency within a second preset time period, and the change in the suction temperature of the indoor unit in the heating mode is less than or equal to a second preset threshold, the currently set opening degree is controlled to be reduced by a second preset opening degree.

8. The temperature-reaching shutdown suppression control method according to claim 6, characterized in that: The step of determining the adjustment amount of the currently set opening based on the change in the intake air temperature includes: If the absolute value of the intake air temperature change is greater than zero and less than or equal to a first change threshold, controlling the currently set opening to increase by a first opening; If the absolute value of the intake air temperature change is greater than the first change threshold and less than or equal to a second change threshold, controlling the currently set opening to increase by a second opening; wherein the second opening is greater than the first opening; If the absolute value of the intake air temperature change is greater than the second change threshold, the currently set opening is controlled to increase by a third opening; wherein the third opening is greater than the second opening.

9. A temperature-reaching shutdown suppression control device for an air conditioner, characterized in that: Applicable to an air conditioner, the air conditioner includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor, a four-way valve and a control valve, the indoor unit includes a heat exchanger, the control valve is arranged in a bypass loop, a first end of the bypass loop is connected between the compressor and the four-way valve, and a second end of the bypass loop is connected between the heat exchanger and the compressor, the temperature-reaching shutdown suppression control device includes: an acquisition module, configured to acquire current environmental parameters related to the indoor temperature corresponding to the air conditioner, and to acquire a set temperature and a current set opening of the control valve corresponding to the current environmental parameters from a pre-stored correspondence between environmental parameters and control valve openings; a determination module, configured to determine a target opening of the control valve based on the currently set opening; An updating module is used to control the control valve to operate at the target opening, obtain the operating parameters of the air conditioner, and update the value of the currently set opening in the correspondence between the environmental parameters and the control valve opening based on the operating parameters.

10. An air conditioner, characterized in that: The method comprises a computer-readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, implements the method according to any one of claims 1 to 8.

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