Air conditioner, control method therefor, and computer storage medium

Abstract

A control method for an air conditioner, an air conditioner, and a computer storage medium. The control method comprises: on the basis of an energy consumption reduction instruction, controlling a compressor to reduce an operating frequency; acquiring a pressure ratio of the compressor; and on the basis of the pressure ratio being smaller than or equal to a lower pressure ratio limit value, executing a preset control instruction, the preset control instruction comprising at least one of the following: reducing the opening degree of a throttling device, reducing the fan speed of an outdoor unit fan, and reducing the fan speed of an indoor unit fan. The control method in the present invention solves the problem of the pressure ratio exceeding a low pressure ratio limit value of the compressor due to the frequency of the compressor being too low when the power of the air conditioner is limited, and makes the operation of the air conditioner more stable.

Description

Air conditioner, control method thereof, and computer storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] A Chinese patent application entitled “Air Conditioner, Control Method Thereof, and Computer Storage Medium”, filed with the State Intellectual Property Office of China on June 27, 2023, with application number 202310768474.X. Technical Field

[0004] The present application relates to the technical field of household appliances, and in particular to an air conditioner, a control method thereof, and a computer storage medium. Background Art

[0005] During the operation of the air conditioner, when it is restricted by external environmental conditions, such as high grid load, high electricity prices, or the air conditioner is involved in a smart building management system, so that the air conditioner receives an instruction to reduce the total power to save energy, the air conditioner often needs to reduce the operating frequency of the compressor based on the need to reduce energy consumption. However, the compressor frequency reduction will cause the compressor's pressure ratio to decrease, and even cause the pressure ratio to fall below the minimum limit, causing damage to the compressor.

[0006] Application Contents

[0007] The purpose of the present disclosure is to at least solve the problem of compressor frequency reduction causing the pressure ratio to fall below the minimum limit. This purpose is achieved through the following technical solutions:

[0008] The first aspect of the present disclosure proposes a control method for an air conditioner, which includes: controlling a compressor to reduce an operating frequency according to an energy consumption reduction instruction; obtaining a pressure ratio of the compressor; and executing at least one of the following control instructions according to the pressure ratio being less than or equal to a lower limit value of the pressure ratio: reducing the opening of a throttling device, reducing the wind speed of an outdoor fan, and reducing the wind speed of an indoor fan.

[0009] According to the control method disclosed in the present invention, when the operating frequency of the compressor is reduced, causing the pressure ratio of the compressor to be lower than the lower limit value of the pressure ratio, the pressure ratio is increased by executing at least one step of reducing the opening of the throttling device, reducing the wind speed of the outdoor fan, and reducing the wind speed of the indoor fan, ensuring that the pressure ratio can be maintained within a range higher than the lower limit value of the pressure ratio, thereby making the operation of the air conditioner more stable.

[0010] In addition, the control method of the air conditioner according to the present disclosure may also have the following additional technical features:

[0011] In some embodiments of the present disclosure, before the step of controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction, it also includes: obtaining the operating mode of the air conditioner; and turning off the electric auxiliary heating device according to the air conditioner being in heating mode.

[0012] In some embodiments of the present disclosure, the step of controlling the compressor to reduce the operating frequency includes: obtaining the operating frequency of the compressor; determining whether the operating frequency is greater than the frequency lower limit value; controlling the compressor to reduce a first frequency value based on the operating frequency according to the operating frequency being greater than the frequency lower limit value; and stopping reducing the operating frequency according to the operating frequency being less than or equal to the frequency lower limit value.

[0013] In some embodiments of the present disclosure, before the step of controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction, it also includes: obtaining the total power of the air conditioner; judging whether the total power is less than or equal to the indicated power value; ending the control process according to the total power being less than or equal to the indicated power value; and executing the step of controlling the compressor to reduce the operating frequency according to the total power being greater than the indicated power value.

[0014] In some embodiments of the present disclosure, after the step of executing a preset control instruction based on the pressure ratio being less than or equal to the pressure ratio lower limit value, the step also includes: judging whether the pressure ratio is less than or equal to the pressure ratio lower limit value; executing the step of judging whether the total power is less than or equal to the indicated power value based on the pressure ratio being greater than the pressure ratio lower limit value; and ending the control process based on the pressure ratio being less than or equal to the pressure ratio lower limit value.

[0015] In some embodiments of the present disclosure, after the step of obtaining the pressure ratio of the compressor, the step further includes: executing the step of determining whether the total power is less than or equal to the indicated power value based on the pressure ratio being greater than the pressure ratio lower limit value.

[0016] In some embodiments of the present disclosure, the step of executing a preset control instruction based on the pressure ratio being less than or equal to the pressure ratio lower limit value includes: controlling the opening of the throttling device to reduce a first opening value; judging whether the pressure ratio is less than or equal to the pressure ratio lower limit value; ending the control process based on the pressure ratio being greater than the pressure ratio lower limit value; obtaining the first exhaust pressure of the compressor before the opening of the throttling device is reduced to a first opening value, and obtaining the second exhaust pressure of the compressor after the opening of the throttling device is reduced to a first opening value based on the pressure ratio being less than or equal to the pressure ratio lower limit value; controlling the opening of the throttling device to reduce a second opening value based on the first exhaust pressure being less than the second exhaust pressure, and judging whether the pressure ratio is less than or equal to the pressure ratio lower limit value; and stopping reducing the opening of the throttling device based on the first exhaust pressure being greater than or equal to the second exhaust pressure.

[0017] In some embodiments of the present disclosure, the first opening value is equal to the second opening value; or, the absolute value of the difference between the first exhaust pressure and the second exhaust pressure is negatively correlated with the absolute value of the difference between the first opening value and the second opening value.

[0018] In some embodiments of the present disclosure, the step of executing a preset control instruction based on the pressure ratio being less than or equal to the pressure ratio lower limit value includes: controlling the opening of the throttling device to reduce a first opening value; judging whether the pressure ratio is less than or equal to the pressure ratio lower limit value; ending the control process based on the pressure ratio being greater than the pressure ratio lower limit value; obtaining the exhaust superheat of the compressor based on the pressure ratio being less than or equal to the pressure ratio lower limit value; judging whether the exhaust superheat is greater than or equal to the superheat upper limit value; controlling the opening of the throttling device to reduce a second opening value based on the exhaust superheat being less than the superheat upper limit value, judging whether the pressure ratio is less than or equal to the pressure ratio lower limit value; and stopping reducing the opening of the throttling device based on the exhaust superheat being greater than or equal to the superheat upper limit value.

[0019] In some embodiments of the present disclosure, the first opening value is equal to the second opening value; or, the absolute value of the difference between the first opening value and the second opening value is negatively correlated with the exhaust superheat.

[0020] In some embodiments of the present disclosure, the step of executing a preset control instruction based on the pressure ratio being less than or equal to the pressure ratio lower limit value includes: based on the air conditioner being in cooling mode, first controlling the indoor fan to lower the wind speed until the wind speed of the indoor fan drops to the lowest speed and then controlling the outdoor fan to lower the wind speed; or, based on the air conditioner being in heating mode, first controlling the outdoor fan to lower the wind speed until the wind speed of the outdoor fan drops to the lowest speed and then controlling the indoor fan to lower the wind speed.

[0021] According to a second aspect of the present disclosure, an air conditioner is further proposed, comprising: a compressor, an indoor fan, an outdoor fan, a throttling device, an electric auxiliary heating device, a first pressure sensor, a second pressure sensor, and a control device; the first pressure sensor is arranged in the exhaust pipe of the compressor and is used to detect the exhaust pressure of the compressor, the second pressure sensor is arranged in the return air pipe of the compressor and is used to detect the return air pressure of the compressor, the control device is electrically connected to the compressor, the indoor fan, the outdoor fan, the throttling device, the electric auxiliary heating device, the first pressure sensor, and the second pressure sensor, the control device is used to calculate a pressure ratio according to the exhaust pressure and the return air pressure, and control the operation of the air conditioner according to the control method of the air conditioner in the technical solution of the first aspect.

[0022] According to the third aspect of the present disclosure, a computer storage medium is also proposed, on which computer-readable instructions are stored. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the air conditioner control method as described in any one of the technical solutions of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] FIG1 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0025] FIG2 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0026] FIG3 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0027] FIG4 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0028] FIG5 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0029] FIG6 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0030] FIG7 schematically shows a flow chart of a method for controlling an air conditioner according to some embodiments of the present disclosure;

[0031] FIG8 schematically shows a flow chart of a control method in cooling mode of an air conditioner according to some embodiments of the present disclosure;

[0032] FIG9 schematically shows a flow chart of a control method in a heating mode of an air conditioner according to some embodiments of the present disclosure;

[0033] FIG10 schematically shows a flow chart of a control method in a heating mode of an air conditioner according to some embodiments of the present disclosure;

[0034] FIG11 schematically shows a block diagram of the structure of an air conditioner according to some embodiments of the present disclosure.

[0035] The reference numerals are as follows: 10, compressor; 20, indoor fan; 30, outdoor fan; 40, electric auxiliary heating device; 50, throttling device; 60, control device; 61, memory; 62, processor; 70, first pressure sensor; 80, second pressure sensor. DETAILED DESCRIPTION

[0036] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only 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 "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence 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 to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0038] 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 otherwise, 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.

[0039] For ease of description, spatially 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 figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0040] As shown in FIG1 , according to an embodiment of the present disclosure, a control method for an air conditioner is proposed, and the control method includes the following steps:

[0041] Step S101: controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction;

[0042] Step S102: obtaining the compression ratio of the compressor;

[0043] Step S103: executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit.

[0044] The energy consumption reduction instruction refers to an instruction to reduce the total operating power of the air conditioner. The energy consumption reduction instruction can be an instruction actively issued by the processor in the air conditioner based on external conditions. For example, the intelligent air conditioner is based on the electricity price information of the power grid. When the electricity price is at its peak, in order to reduce the cost of use, it actively lowers the total operating power of the air conditioner and reduces power consumption.

[0045] Alternatively, the energy consumption reduction instruction can also be an instruction issued by an external device to the air conditioner. For example, the air conditioner is connected to a smart grid system. The smart grid system has a high-performance power control device with a built-in digital computer, which is connected to each other through a network from the power generation equipment to the terminal power equipment (such as the air conditioner). When the load on the power grid is high during peak power consumption, the power control device issues an energy reduction instruction to high-power-consuming equipment such as the air conditioner in order to improve the balance between power supply and demand in the power grid, optimize power distribution, prevent power outages, and reduce costs.

[0046] Alternatively, in the air conditioner of the smart building system, the air conditioner receives power allocation from the smart building system. When the electricity price is at a peak or the power supply load in the smart building is large, an energy consumption reduction instruction is sent to the air conditioner through the smart building system.

[0047] In step S101, since the compressor is the core component for the air conditioner to generate heat, and the energy consumption of the compressor accounts for most of the total energy consumption of the air conditioner, reducing the operating frequency of the compressor can quickly reduce the total operating power of the air conditioner.

[0048] In steps S102 and S103, the compression ratio of the compressor is the value obtained by dividing the absolute pressure on the high-pressure side of the compressor by the absolute pressure on the low-pressure side. The absolute pressure on the high-pressure side is the exhaust pressure of the compressor, and the absolute pressure on the low-pressure side is the suction pressure of the compressor. Generally, the compression ratio of the compressor is within a reasonable range. Too high or too low compression ratio will affect the operation of the air conditioner. Among them, when the operating frequency of the compressor decreases, the compression ratio of the compressor also decreases. If the compression ratio decreases to be lower than or equal to the lower limit value of the compression ratio, it will damage the compressor and affect the stability of the operation of the air conditioner.

[0049] Among them, the value range of the lower limit value K of the compression ratio can be 1 < K < 4, such as 1.2, 1.5, 1.6, 1.8, 2, etc. It should be noted that the lower limit value of the compression ratio has different values according to different compressor models. The lower limit value of the compression ratio can also be set to other parameters matching the compressor model, and no specific limitation is made here. <000,0104>The preset control instruction includes at least one of reducing the opening degree of the throttling device, reducing the wind speed of the outdoor fan, and reducing the wind speed of the indoor fan. By controlling the air conditioner to execute the preset control instruction, the compression ratio value of the compressor can be increased, so that the compression ratio value of the compressor is greater than the lower limit value of the compression ratio. Thus, it can better ensure the reliability of the operation of the air conditioner after reducing the operating frequency, and avoid damage caused by too low compression ratio when the compressor operates under the condition of a lower operating frequency.

[0051] In this embodiment, according to the embodiment of the present disclosure, before the step of controlling the compressor to reduce the operating frequency, the steps further include: obtaining the operating mode of the air conditioner; judging whether the electric auxiliary heating device is turned on according to the heating mode of the air conditioner. If the electric auxiliary heating device is turned on, the electric auxiliary heating device is turned off. If the electric auxiliary heating device is not turned on, the step of controlling the compressor to reduce the operating frequency is executed. It can be understood that when the compressor is in the heating mode, if the external environmental temperature is too low and only turning on the compressor cannot meet the heating demand, the electric auxiliary heating device needs to be turned on to increase the heat output of the air conditioner. However, the electric auxiliary heating device warms by converting electrical energy into heat energy. The inside of the electric auxiliary heating device is a resistance wire, which converts electrical energy into heat energy and transmits it to the room after being powered on, and the power consumption is relatively large. Therefore, when the air conditioner receives the energy consumption reduction instruction, the electric auxiliary heating device is preferentially turned off. It can be understood that the electric auxiliary heating device will not be turned on when the air conditioner is in the cooling mode. Therefore, the factor of the electric auxiliary heating device is not considered in the control steps in the cooling mode.

[0052] As shown in FIG2 , according to an embodiment of the present disclosure, the step of controlling the compressor to reduce the operating frequency includes:

[0053] Step S201: obtaining the operating frequency of the compressor;

[0054] Step S202: Determine whether the operating frequency is greater than the frequency lower limit, if so, execute step S203, if not, execute step S204;

[0055] Step S203: controlling the compressor to reduce the first frequency value based on the operating frequency;

[0056] Step S204: Stop reducing the operating frequency.

[0057] It should be noted that the compressor in the air conditioner in the present disclosure refers to a variable-frequency compressor. Compared to a compressor with a constant speed, a variable-frequency compressor can continuously adjust its speed within a certain range and continuously change its output energy. Different models of compressors have different frequency ranges while ensuring stable operation. For example, some models of compressors have an operating frequency range of 20Hz to 120Hz, and the lower limit of the frequency of such compressors is 20Hz; other models of compressors have an operating frequency range of 25Hz to 130Hz, and the lower limit of the frequency of such compressors is 205Hz; and still other models of compressors have an operating frequency range of 30Hz to 130Hz, and the lower limit of the frequency of such compressors is 30Hz. Therefore, based on different models of compressors, their lower limits of frequency have different values, which are not specifically limited here.

[0058] When the compressor operating frequency is greater than the lower frequency limit, it indicates that the compressor is currently operating normally and there is room for the compressor operating frequency to be lowered. Therefore, the compressor operating frequency is controlled to be reduced by the first frequency value to further reduce the total power of the air conditioner's overall operation and reduce the air conditioner's power consumption. When the compressor operating frequency is less than or equal to the lower frequency limit, it indicates that there is no room for the compressor operating frequency to be lowered. Further reduction of the compressor operating frequency will cause abnormal compressor operation, unstable air conditioner operation, or damage to the compressor. Therefore, further reduction of the operating frequency is stopped.

[0059] In some embodiments, if the operating frequency of the compressor is less than the lower frequency limit, the operating frequency of the compressor is increased to the lower frequency limit to ensure that the compressor can operate normally.

[0060] In some embodiments, the first frequency value is set to a fixed value, and the value range of the first frequency value can be 1 Hz to 20 Hz, or 0.1 Hz to 10 Hz. For example, the first frequency value can be set to 1 Hz, 2 Hz, 3 Hz, 5 Hz, 6 Hz, 7 Hz, 8 Hz, 9 Hz, 10 Hz, 12 Hz, 14 Hz, 15 Hz, 18 Hz, 20 Hz, etc.

[0061] In other embodiments, the first frequency value can be adjusted according to the difference between the current operating frequency value of the compressor and the frequency lower limit value. For example, the first frequency value is set to be positively correlated with the difference between the operating frequency value and the frequency lower limit value. The larger the difference, the larger the first frequency value. In the process of multiple adjustments to the compressor, as the difference between the operating frequency of the compressor and the frequency lower limit value decreases, the first frequency value also decreases. In the process of multiple adjustments to the compressor, the first frequency value is the largest when the operating frequency of the compressor is reduced for the first time. After the operating frequency of the compressor is reduced for the first time, the first frequency value gradually decreases to achieve precise adjustment of the compressor frequency reduction. Moreover, in each adjustment process, the first frequency value is less than the difference between the current operating frequency value of the compressor and the frequency lower limit value, so as to avoid the operating frequency of the compressor from decreasing below the frequency lower limit value, thereby improving the stability of the compressor operation.

[0062] In other embodiments, the first frequency value can be adjusted according to the difference between the current total power of the air conditioner and the specified power corresponding to the energy consumption reduction instruction. The first frequency value is set to be positively correlated with the difference between the current total power of the air conditioner and the specified power corresponding to the energy consumption reduction instruction. The larger the difference, the larger the first frequency value. In the process of multiple adjustments to the compressor, as the difference between the operating frequency of the compressor and the frequency lower limit decreases, the first frequency value also decreases accordingly, so as to quickly reduce the total power of the air conditioner operation, so that the air conditioner can quickly respond to the energy consumption reduction instruction.

[0063] It should be emphasized that during each adjustment process, the first frequency value is less than the difference between the current operating frequency value of the compressor and the frequency lower limit value, so as to prevent the operating frequency of the compressor from falling below the frequency lower limit value and improve the stability of the compressor operation.

[0064] As shown in FIG3 , according to an embodiment of the present disclosure, a method for controlling an air conditioner includes the following steps:

[0065] Step S301: Obtaining an energy consumption reduction instruction;

[0066] Step S302: Obtaining the total power of the air conditioner;

[0067] Step S303: determine whether the total power P is less than or equal to the indicated power value P1, if so, end the control process, if not, execute step S304;

[0068] Step S304: controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction;

[0069] Step S305: obtaining the pressure ratio of the compressor;

[0070] Step S306: executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit.

[0071] In this embodiment, step S301 is the same as step S101, and steps S304 to S306 are the same as steps S101 to S103, and are not described again here.

[0072] In step S301, obtaining the energy consumption reduction instruction means that the control device in the air conditioner obtains the energy consumption reduction instruction sent from the smart grid system or the smart building system to the air conditioner.

[0073] In step S302 and step S303, after obtaining the energy consumption reduction instruction, first determine whether the total power of the air conditioner currently running meets the indicated power value corresponding to the energy consumption reduction instruction. If the total power is less than or equal to the indicated power value, it means that the power consumption of the current air conditioner operating state meets the requirements, so that the air conditioner maintains the current operating state unchanged. If the total power is greater than the indicated power value, the compressor is controlled to reduce the operating frequency.

[0074] As shown in FIG4 , according to an embodiment of the present disclosure, a method for controlling an air conditioner includes the following steps:

[0075] Step S401: Obtaining an energy consumption reduction instruction;

[0076] Step S402: Obtaining the total power of the air conditioner;

[0077] Step S403: Determine whether the total power P is less than or equal to the indicated power value P1. If so, the control process ends. If not, execute step S404:

[0078] Step S404: controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction;

[0079] Step S405: obtaining the pressure ratio of the compressor;

[0080] Step S406: executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit;

[0081] Step S407: Determine whether the pressure ratio is less than the pressure ratio lower limit value. If so, end the control process; otherwise, execute step S403.

[0082] In this embodiment, steps S401 to S406 are the same as steps S301 to S306 and are not described again here.

[0083] In step S407, after the air conditioner executes the preset control instruction, if the pressure ratio of the compressor is still less than or equal to the lower limit value of the pressure ratio, it means that the operating frequency of the compressor is too low in the current operating environment of the air conditioner and the stable operation of the compressor can no longer be guaranteed. Therefore, the current control process is terminated and the compressor is stopped from continuing to reduce the frequency.

[0084] It is understandable that in some embodiments, in order to ensure the stable operation of the air conditioner, if the pressure ratio of the compressor is still less than or equal to the lower limit of the pressure ratio after the air conditioner executes all the preset control instructions, the operating frequency of the compressor is increased to ensure that the pressure ratio is greater than the lower limit of the pressure ratio, so that the compressor can operate stably.

[0085] If the compression ratio of the compressor is greater than or equal to the compression ratio, the process returns to step S403 to determine whether the current total power of the air conditioner is less than or equal to the indicated power value. If the total power value is still greater than the indicated power value, the frequency of the compressor continues to be reduced under the premise that the frequency of the compressor has not been reduced to the lower limit value.

[0086] It should be noted that, in the present embodiment, a control step of reducing the frequency of the compressor is completed from step S401 to step S406, and the next control cycle of reducing the frequency of the compressor is entered when returning from step S407 to step S403. In each control cycle, the operating frequency of the compressor is controlled to be reduced by the first frequency value based on the total power of the air conditioner being greater than the indicated power value.

[0087] As shown in FIG5 , according to an embodiment of the present disclosure, a method for controlling an air conditioner includes the following steps:

[0088] Step S501: Obtaining an energy consumption reduction instruction;

[0089] Step S502: Obtaining the total power of the air conditioner;

[0090] Step S503: determine whether the total power P is less than or equal to the indicated power value P1, if so, end the control process, if not, execute step S504;

[0091] Step S504: controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction;

[0092] Step S505: obtaining the pressure ratio of the compressor;

[0093] Step S506: executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit;

[0094] Step S507: Execute step S503 according to the pressure ratio being greater than the pressure ratio lower limit.

[0095] In this embodiment, steps S501 to S506 are the same as steps S401 to S406 and are not described again here.

[0096] In step S507, if the pressure ratio of the compressor is greater than the lower limit value of the pressure ratio after the air conditioner executes the step of reducing the operating frequency of the compressor, it means that the stable operation of the compressor is not affected after the operating frequency of the compressor is reduced. Under the premise of maintaining stable operation of the compressor, the operating frequency of the compressor still has room for reduction to continue to reduce the total power of the air conditioner. Therefore, return to step S503 to determine whether the total power after the operating frequency of the compressor is reduced is less than or equal to the indicated power. If not, continue to reduce the operating frequency of the compressor. If so, it means that the current operating state of the air conditioner can meet the requirements of the energy consumption reduction instruction and can maintain stable operation, and then end the control step.

[0097] As shown in FIG6 , in some embodiments of the present disclosure, the step of executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit includes:

[0098] Step S601: controlling the opening of the throttling device to decrease to a first opening value;

[0099] Step S602: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S603, if not, end the control process;

[0100] Step S603: Acquire a first exhaust pressure of the compressor before the opening of the throttling device is reduced to a first opening value and a second exhaust pressure of the compressor after the opening of the throttling device is reduced to the first opening value;

[0101] Step S604: Determine whether the first exhaust pressure Pc1 is less than the second exhaust pressure Pc2. If yes, go to step S605; otherwise, go to step S606.

[0102] Step S605: controlling the opening of the throttling device to decrease to a second opening value, and executing step S602;

[0103] Step S606: Stop adjusting the opening of the downward flow device.

[0104] In this embodiment, in step S601, a throttling device is provided in the refrigerant pipeline of the air conditioner. When the opening of the throttling device is reduced, the exhaust side pressure Pc of the compressor can be increased and the return side pressure Pe of the compressor can be reduced, so that the pressure ratio Pc / Pe of the compressor increases.

[0105] In step S602, after reducing the opening of the throttling device by the first opening value, the relationship between the pressure ratio of the compressor and the lower limit of the pressure ratio is judged. If the pressure ratio is greater than the lower limit of the pressure ratio, it means that the pressure ratio has been effectively increased by adjusting the opening of the throttling device, so that the compressor can operate stably, and there is no need to continue to adjust the opening of the throttling device. If the pressure ratio is still less than or equal to the lower limit of the pressure ratio, it means that the opening of the throttling device needs to be further reduced.

[0106] In step S603, generally, a decrease in the opening of the throttle device will increase the exhaust pressure of the compressor. Therefore, generally, after the opening of the throttle device is reduced by a first opening value, the second exhaust pressure is greater than the first exhaust pressure. Specifically, the first exhaust pressure is the exhaust pressure of the compressor before the opening of the throttle device is reduced by the first opening value, and the second exhaust pressure is the exhaust pressure of the compressor after the opening of the throttle device is reduced by the first opening value. However, if the opening of the throttle device is too small or the opening of the throttle device is close to the closed state, the compressor will have too little gas on the suction side, resulting in a decrease in the exhaust volume on the exhaust side of the compressor, thereby causing the first exhaust pressure to be greater than or equal to the second exhaust pressure.

[0107] Therefore, in steps S604 to S606, when the first exhaust pressure is lower than the second exhaust pressure, it indicates that the current opening of the throttling device is within the normal range, and the opening of the throttling device can still be further reduced, so the opening of the throttling device is controlled to continue to reduce the second opening value; when the first exhaust pressure is greater than or equal to the second exhaust pressure, it indicates that the current opening of the throttling device is too small, and the throttling device opening is stopped from being further reduced.

[0108] In some embodiments, if the first exhaust pressure is greater than or equal to the second exhaust pressure, the opening of the throttling device may be increased by a third opening value, wherein the third opening value is smaller than the first opening value, to increase the exhaust pressure of the compressor.

[0109] In some embodiments, the first opening value is equal to the second opening value, and the opening value of the throttling device is equal each time it is adjusted. In the process of adjusting the throttling device multiple times, the opening of the throttling device is reduced at a constant speed, which is conducive to making the exhaust pressure of the compressor change more evenly and making the overall operation of the air conditioner more stable.

[0110] In some embodiments, the first opening value and the second opening value are not equal, and each time the opening of the throttling device is adjusted, the opening of the throttling device is determined by referring to the difference between the second exhaust pressure and the first exhaust pressure. The opening of the throttling device is adjusted by adjusting the change in the compressor exhaust pressure (i.e., the absolute value of the difference between the second exhaust pressure and the first exhaust pressure) each time the opening of the throttling device is adjusted, so that the adjustment of the throttling device has an intelligent feedback mechanism to improve the response speed and control accuracy of the throttling device. Specifically, the absolute value of the difference between the first exhaust pressure and the second exhaust pressure is negatively correlated with the absolute value of the difference between the first opening value and the second opening value. It can be understood that after the opening of the throttling device is reduced by the first opening value, the greater the change in the compressor exhaust pressure, the smaller the change in the second opening value relative to the first opening value (i.e., the absolute value of the difference between the second opening value and the first opening value); the smaller the change in the compressor exhaust pressure, the greater the change in the second opening value relative to the first opening value (i.e., the absolute value of the difference between the second opening value and the first opening value).

[0111] As shown in FIG7 , in some embodiments of the present disclosure, the step of executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit includes:

[0112] Step S701: controlling the opening of the throttling device to decrease to a first opening value;

[0113] Step S702: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S703, if not, end the control process;

[0114] Step S703: Obtain the exhaust superheat of the compressor

[0115] Step S704: Determine whether the exhaust gas superheat HDSH is greater than or equal to the superheat upper limit B. If so, execute step S706; otherwise, execute step S705.

[0116] Step S705: controlling the opening of the throttling device to decrease to a second opening value, and executing step S702;

[0117] Step S706: Stop adjusting the opening of the downward flow device.

[0118] In this embodiment, in step S701, a throttling device is provided in the refrigerant pipeline of the air conditioner. When the opening of the throttling device is reduced, the exhaust superheat of the compressor can be increased.

[0119] In step S702, after reducing the opening of the throttling device by the first opening value, the relationship between the pressure ratio of the compressor and the lower limit of the pressure ratio is judged. If the pressure ratio is greater than the lower limit of the pressure ratio, it means that the pressure ratio has been effectively increased by adjusting the opening of the throttling device, so that the compressor can operate stably, and there is no need to continue to adjust the opening of the throttling device. If the pressure ratio is still less than or equal to the lower limit of the pressure ratio, it means that the opening of the throttling device needs to be further reduced.

[0120] In step S703, under normal circumstances, the exhaust superheat of the compressor before the opening of the throttling device is reduced to the first opening value is smaller than the exhaust superheat of the compressor after the opening of the throttling device is reduced to the first opening value, that is, after the throttling device reduces its opening, the exhaust superheat of the compressor will increase. However, if the exhaust superheat is too large, it will affect the normal operation of the air conditioner and even cause damage.

[0121] In steps S704 to S706, when the exhaust superheat is less than the superheat upper limit value, it means that the current opening of the throttling device is within the normal range, and the opening of the throttling device can still be further reduced, so the opening of the throttling device is controlled to continue to decrease to the second opening value; when the exhaust superheat is greater than or equal to the superheat upper limit value, it means that the current opening of the throttling device is too small, and the opening of the throttling device is stopped from being further reduced.

[0122] In some embodiments, if the exhaust superheat is greater than or equal to the superheat upper limit, the opening of the throttling device can be increased by a third opening value, wherein the third opening value is smaller than the first opening value, to reduce the exhaust superheat of the compressor.

[0123] In some embodiments, the first opening value is equal to the second opening value, and the opening value of the throttling device is equal each time it is adjusted. In the process of adjusting the throttling device multiple times, the opening of the throttling device is reduced at a constant speed, which is conducive to making the exhaust superheat of the compressor change more evenly and making the overall operation of the air conditioner more stable.

[0124] In some embodiments, the first opening value and the second opening value are not equal, and each adjustment of the throttling device's opening is determined with reference to the exhaust superheat value, so that the adjustment of the throttling device has an intelligent feedback mechanism to improve the throttling device's response speed and control accuracy. Specifically, the exhaust superheat and the absolute value of the difference between the first opening value and the second opening value are negatively correlated. It can be understood that after the throttling device's opening is reduced by the first opening value, the greater the value of the compressor's exhaust superheat, the smaller the change in the second opening value relative to the first opening value (i.e., the absolute value of the difference between the second opening value and the first opening value); and the smaller the value of the compressor's exhaust superheat, the greater the change in the second opening value relative to the first opening value (i.e., the absolute value of the difference between the second opening value and the first opening value).

[0125] As shown in FIG8 , according to some specific embodiments of the present disclosure, a method for controlling an air conditioner is proposed. In cooling mode, the method for controlling the air conditioner specifically includes the following steps:

[0126] Step S801: Obtaining an energy consumption reduction instruction;

[0127] Step S802: Obtain the total power of the air conditioner;

[0128] Step S803: determine whether the total power P is less than or equal to the indicated power value P1, if so, end the control process, if not, execute step S804;

[0129] Step S804: obtaining the operating frequency of the compressor;

[0130] Step S805: Determine whether the operating frequency f is greater than the frequency lower limit f1, if so, execute step S806, if not, end the control process;

[0131] Step S806: controlling the compressor to reduce the first frequency value based on the operating frequency;

[0132] Step S807: Obtain the pressure ratio of the compressor;

[0133] Step S808: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S809, if not, execute step S803;

[0134] Step S809: controlling the opening of the throttling device to decrease to a first opening value;

[0135] Step S810: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S811, if not, execute step S803;

[0136] Step S811: obtaining the exhaust superheat of the compressor, obtaining a first exhaust pressure of the compressor before the opening of the throttling device is reduced to a first opening value, and obtaining a second exhaust pressure of the compressor after the opening of the throttling device is reduced to the first opening value;

[0137] Step S812: Determine whether the first exhaust pressure Pc1 is less than the second exhaust pressure Pc2. If so, execute step S813; otherwise, execute step S814. Alternatively, determine whether the exhaust superheat HDSH is less than the superheat upper limit B. If so, execute step S813; otherwise, execute step S814.

[0138] Step S813: controlling the opening of the throttling device to decrease to a second opening value;

[0139] Step S814: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S815, if not, execute step S803;

[0140] Step S815: Determine whether the wind speed of the indoor fan is at the lowest level. If so, execute step S817. If not, control the wind speed of the indoor fan to be lowered by one level.

[0141] Step S816: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit. If so, execute step S815; otherwise, execute step S803.

[0142] Step S817: Determine whether the wind speed of the outdoor fan is at the lowest level. If so, end the control process. If not, control the wind speed of the outdoor fan to be lowered by one level.

[0143] Step S818: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value. If so, execute step S817; otherwise, execute step S803.

[0144] In this embodiment, after the air conditioner obtains the energy consumption reduction instruction, the preset control instructions executed by the air conditioner include reducing the opening of the throttling device, reducing the wind speed of the indoor fan, and reducing the wind speed of the outdoor fan.

[0145] It should be noted that in the cooling mode, the heat exchanger in the indoor unit of the air conditioner serves as an evaporator, and the heat exchanger in the outdoor unit serves as a condenser. Therefore, preferentially lowering the wind speed of the indoor unit fan can reduce the return air pressure Pe of the compressor to increase the pressure ratio Pc / Pe. When the wind speed of the indoor unit fan is reduced to the lowest level, the wind speed of the outdoor unit fan is further lowered to increase the exhaust pressure Pc on the exhaust side of the compressor, thereby increasing the pressure ratio (Pc / Pe) value.

[0146] As shown in FIG9 , according to some specific embodiments of the present disclosure, a method for controlling an air conditioner is proposed. In the heating mode, the method for controlling the air conditioner specifically includes the following steps:

[0147] Step S901: obtaining an energy consumption reduction instruction and turning off the electric auxiliary heating device;

[0148] Step S902: Obtaining the total power of the air conditioner;

[0149] Step S903: determine whether the total power P is less than or equal to the indicated power value P1, if so, end the control process, if not, execute step S904;

[0150] Step S904: obtaining the operating frequency of the compressor;

[0151] Step S905: Determine whether the operating frequency is greater than the frequency lower limit, if so, execute step S906, if not, end the control process;

[0152] Step S906: controlling the compressor to reduce the first frequency value based on the operating frequency;

[0153] Step S907: Obtain the pressure ratio of the compressor;

[0154] Step S908: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit. If so, execute step S909; otherwise, execute step S903.

[0155] Step S909: controlling the opening of the throttling device to decrease to a first opening value;

[0156] Step S910: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S911, if not, execute step S903;

[0157] Step S911: obtaining the exhaust superheat of the compressor, obtaining the first exhaust pressure of the compressor before the opening of the throttling device is reduced to a first opening value, and obtaining the second exhaust pressure of the compressor after the opening of the throttling device is reduced to the first opening value;

[0158] Step S912: Determine whether the first exhaust pressure Pc1 is less than the second exhaust pressure Pc2. If so, execute step S913; otherwise, execute step S914. Alternatively, determine whether the exhaust superheat HDSH is less than the superheat upper limit B. If so, execute step S913; otherwise, execute step S914.

[0159] Step S913: controlling the opening of the throttling device to decrease to a second opening value;

[0160] Step S914: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S915, if not, execute step S903;

[0161] Step S915: Determine whether the wind speed of the outdoor fan is at the lowest level. If so, execute step S917. If not, control the wind speed of the outdoor fan to be lowered by one level.

[0162] Step S916: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit. If so, execute step S915; otherwise, execute step S903.

[0163] Step S917: Determine whether the wind speed of the indoor fan is at the lowest level. If so, end the control process. If not, control the wind speed of the indoor fan to be lowered by one level.

[0164] Step S918: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S917, otherwise execute step S903.

[0165] In this embodiment, after the air conditioner obtains the energy consumption reduction instruction, the preset control instructions executed by the air conditioner include reducing the opening of the throttling device, reducing the wind speed of the indoor fan, and reducing the wind speed of the outdoor fan.

[0166] It should be noted that in the heating mode, the heat exchanger in the indoor unit of the air conditioner acts as a condenser, and the heat exchanger in the outdoor unit acts as an evaporator. Therefore, preferentially lowering the wind speed of the outdoor unit fan can reduce the return air pressure Pe of the compressor to increase the pressure ratio Pc / Pe. When the wind speed of the outdoor unit fan is lowered to the lowest level, the wind speed of the indoor unit fan is lowered to increase the exhaust pressure Pc on the exhaust side of the compressor, thereby increasing the pressure ratio (Pc / Pe) value.

[0167] As shown in FIG10 , according to some specific embodiments of the present disclosure, a method for controlling an air conditioner is proposed. In the heating mode, the method for controlling the air conditioner specifically includes the following steps:

[0168] Step S1001: obtaining an energy consumption reduction instruction and shutting down the electric auxiliary heating device;

[0169] Step S1002: Obtaining the total power of the air conditioner;

[0170] Step S1003: determine whether the total power P is less than or equal to the indicated power value P1, if so, end the control process, if not, execute step S1004;

[0171] Step S1004: obtaining the operating frequency of the compressor;

[0172] Step S1005: determine whether the operating frequency is greater than the frequency lower limit, if so, execute step S1006, if not, end the control process;

[0173] Step S1006: controlling the compressor to reduce the first frequency value based on the operating frequency;

[0174] Step S1007: Obtain the pressure ratio of the compressor;

[0175] Step S1008: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S1009, if not, execute step S1003;

[0176] Step S1009: Determine whether the wind speed of the outdoor fan is at the lowest level. If so, execute step S1011. If not, control the wind speed of the outdoor fan to be lowered by one level.

[0177] Step S1010: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S1011, if not, execute step S1003;

[0178] Step S1011: Determine whether the wind speed of the indoor fan is at the lowest level. If so, execute step S1013; if not, control the wind speed of the indoor fan to be lowered by one level.

[0179] Step S1012: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S1013, if not, execute step S1003;

[0180] Step S1013: controlling the opening of the throttling device to decrease to a first opening value;

[0181] Step S1014: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S1015, if not, execute step S1003;

[0182] Step S1015: obtaining the exhaust superheat of the compressor, obtaining a first exhaust pressure of the compressor before the opening of the throttling device is reduced to a first opening value, and obtaining a second exhaust pressure of the compressor after the opening of the throttling device is reduced to the first opening value;

[0183] Step S1016: Determine whether the first exhaust pressure Pc1 is less than the second exhaust pressure Pc2. If so, execute step S1017; otherwise, terminate the control process. Alternatively, determine whether the exhaust superheat HDSH is less than the superheat upper limit B. If so, execute step S1017; otherwise, terminate the control process.

[0184] Step S1017: controlling the opening of the throttling device to decrease to a second opening value;

[0185] Step S1018: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value. If so, execute step S1015; otherwise, execute step S1003.

[0186] In this embodiment, in the process of reducing the opening of the throttling device and lowering the wind speed of the outdoor fan and the indoor fan, the step of adjusting the opening of the throttling device is placed after the step of adjusting the outdoor fan and the indoor fan, which is beneficial to improving the cooling output or heat output of the air conditioner while ensuring low energy consumption of the air conditioner.

[0187] In detail, when the wind speed of the outdoor fan and the indoor fan is lowered, the power of the indoor fan and the outdoor fan is also reduced. Therefore, prioritizing the reduction of the wind speed of the outdoor fan and the indoor fan can prioritize the reduction of the total operating power of the air conditioner, and when the total power meets the standard and the pressure ratio is greater than the lower limit of the pressure ratio, the throttling device is kept at a larger opening, so that the refrigerant flow in the air conditioner is smoother, thereby improving the cooling capacity or heating capacity of the air conditioner.

[0188] It should be noted that, in addition to the Pc / Pe method proposed in this disclosure, other pressure-related methods such as calculating the pressure ratio based on physical parameters such as saturation temperature and then applying the algorithm of this patent to determine whether the refrigerant system of the controller exceeds the low-pressure operating range also fall within the scope of protection.

[0189] It should also be emphasized that, in this application, after the air conditioner executes and completes all preset control instructions, if the compressor's pressure ratio is still less than or equal to the lower pressure ratio limit, the control device controls the air conditioner to exit the low-energy consumption frequency-limited mode to ensure the reliability of the air conditioner system. Exiting the low-energy consumption frequency-limited mode means controlling the air conditioner to exit the step of executing the preset control instructions and controlling the compressor's operating frequency to increase to ensure stable operation of the air conditioner system.

[0190] According to some specific embodiments of the present disclosure, a method for controlling an air conditioner is proposed. In heating mode, the method for controlling the air conditioner specifically includes the following steps:

[0191] In some embodiments, in an air conditioner without a throttling device, the control method comprises the following steps:

[0192] Step S1101: obtaining an energy consumption reduction instruction and turning off the electric auxiliary heating device;

[0193] Step S1102: Obtain the total power of the air conditioner

[0194] Step S1103: determine whether the total power P is less than or equal to the indicated power value P1, if so, end the control process, if not, execute step S1104;

[0195] Step S1104: obtaining the operating frequency of the compressor;

[0196] Step S1105: determine whether the operating frequency is greater than the frequency lower limit, if so, execute step S1106, if not, end the control process;

[0197] Step S1106: controlling the compressor to reduce the first frequency value based on the operating frequency;

[0198] Step S1107: Obtain the pressure ratio of the compressor;

[0199] Step S1108: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S1109, if not, execute step S1103;

[0200] Step S1109: Determine whether the wind speed of the indoor fan is at the lowest level. If so, execute step S1111. If not, control the wind speed of the outdoor fan to be lowered by one level.

[0201] Step S1110: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value, if so, execute step S1109, if not, execute step S1103;

[0202] Step S1111: Determine whether the wind speed of the outdoor fan is at the lowest level. If so, execute step S1112; if not, control the wind speed of the indoor fan to be lowered by one level.

[0203] Step S1112: Determine whether the pressure ratio is less than or equal to the pressure ratio lower limit value. If so, end the control process; otherwise, execute step S1103.

[0204] According to an embodiment of the present disclosure, an air conditioner is also proposed, as shown in Figure 11, the air conditioner includes a refrigerant circulation pipeline, and a compressor 10, an indoor unit, a throttling device 50 and an outdoor unit connected in series in the refrigerant circulation pipeline. The indoor unit includes an indoor heat exchanger and an indoor fan 20 corresponding to the indoor heat exchanger. The outdoor unit includes an outdoor heat exchanger and an outdoor fan 30 corresponding to the outdoor heat exchanger. An electric auxiliary heating device 40 is also provided in the indoor unit. A first pressure sensor 70 is provided in the exhaust pipeline of the refrigerant circulation pipeline on the exhaust side of the compressor 10, and a second sensor is provided in the return air side of the refrigerant circulation pipeline on the return air side of the compressor 10. In the air pipeline, the first pressure sensor 70 can detect the exhaust pressure Pc of the compressor 10, and the second pressure sensor 80 can detect the return air pressure Pe of the compressor 10. The control device 60 is electrically connected to the compressor 10, the indoor fan 20, the outdoor fan 30, the throttling device 50, the electric auxiliary heating device 40, the first pressure sensor 70, and the second pressure sensor 80. The control device 60 can obtain the return air pressure Pe and the exhaust pressure Pc, and calculate the pressure ratio of the compressor 10 based on the return air pressure Pe and the exhaust pressure Pc. The control device 60 can also control the operation of the air conditioner based on the control method of the air conditioner proposed in the present disclosure.

[0205] The control device 60 includes a memory 61 and at least one processor 62, wherein the memory 61 stores programs or instructions that can be run on the processor 62, and when the processor 62 executes the program or instruction, the steps of the air conditioner control method in this application are implemented.

[0206] The control method of the air conditioner proposed in the present disclosure solves the problem that when the power of the air conditioner is limited, the compressor frequency is too low, resulting in the pressure ratio exceeding the low pressure ratio limit of the compressor.

[0207] According to an embodiment of the present disclosure, a computer storage medium is further provided, on which computer-readable instructions are stored. When the computer-readable instructions are executed by one or more processors, the one or more processors execute the control method of the air conditioner in any embodiment of the present disclosure. The processor involved in the present disclosure can be, for example, an air conditioning system, and the air conditioning system includes but is not limited to a window air conditioner, a split wall-mounted air conditioner, a split cabinet air conditioner, a ceiling-mounted air conditioner, an embedded air conditioner, and a central air conditioner. The control method of the air conditioner may include but is not limited to at least one of the following steps: obtaining an energy consumption reduction instruction; controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction; obtaining the pressure ratio of the compressor; and executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit.

[0208] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable storage media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0209] It should be understood that various parts of the present disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement the hardware: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0210] The above description is merely a preferred embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A method for controlling an air conditioner, wherein: The control method of the air conditioner comprises: Control the compressor to reduce the operating frequency according to the energy consumption reduction instruction; Obtaining a pressure ratio of the compressor; Execute a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit value; The preset control instruction includes at least one of the following: reducing the opening of the throttling device, reducing the wind speed of the outdoor fan, and reducing the wind speed of the indoor fan.

2. The control method of the air conditioner according to claim 1, wherein: Before the step of controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction, the method further includes: Acquire the operating mode of the air conditioner; The electric auxiliary heating device is turned off according to the air conditioner being in the heating mode.

3. The control method of the air conditioner according to claim 1, wherein: The step of controlling the compressor to reduce the operating frequency comprises: Get the operating frequency of the compressor; Determining whether the operating frequency is greater than the frequency lower limit; According to the operating frequency being greater than the frequency lower limit value, controlling the compressor to reduce a first frequency value based on the operating frequency; According to the operating frequency being less than or equal to the frequency lower limit value, the operating frequency is stopped from being lowered.

4. The control method of the air conditioner according to claim 1, wherein: Before the step of controlling the compressor to reduce the operating frequency according to the energy consumption reduction instruction, the method further includes: obtaining the total power of the air conditioner operation; Determining whether the total power is less than or equal to the indicated power value; End the control process according to the total power being less than or equal to the indicated power value; The step of controlling the compressor to reduce the operating frequency is performed according to the total power being greater than the indicated power value.

5. The control method of the air conditioner according to claim 4, wherein: After the step of executing the preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit value, the method further includes: Determining whether the pressure ratio is less than or equal to the pressure ratio lower limit; According to the pressure ratio being greater than the pressure ratio lower limit value, performing the step of determining whether the total power is less than or equal to the indicated power value; The control process is ended according to the pressure ratio being less than or equal to the pressure ratio lower limit value.

6. The control method of the air conditioner according to claim 4, wherein: After the step of obtaining the pressure ratio of the compressor, the method further includes: The step of determining whether the total power is less than or equal to the indicated power value is performed according to the pressure ratio being greater than the pressure ratio lower limit value.

7. The control method of the air conditioner according to claim 1, wherein: The step of executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit value comprises: Controlling the opening of the throttling device to reduce a first opening value; Determining whether the pressure ratio is less than or equal to the pressure ratio lower limit; Ending the control process according to the pressure ratio being greater than the pressure ratio lower limit; According to the pressure ratio being less than or equal to the pressure ratio lower limit value, obtaining the opening of the throttling device before the opening is reduced to the first opening value a first exhaust pressure of the compressor, and obtaining a second exhaust pressure of the compressor after the opening of the throttling device is reduced by a first opening value; According to the first exhaust pressure being less than the second exhaust pressure, the opening of the throttling device is controlled to be reduced by a second opening value, and whether the pressure ratio is less than or equal to the pressure ratio lower limit value is determined; According to the first exhaust pressure being greater than or equal to the second exhaust pressure, the opening of the throttling device is stopped from being reduced.

8. The control method of the air conditioner according to claim 7, wherein: The first opening value is equal to the second opening value; Alternatively, the absolute value of the difference between the first exhaust pressure and the second exhaust pressure is negatively correlated with the absolute value of the difference between the first opening value and the second opening value.

9. The control method of the air conditioner according to claim 1, wherein: The step of executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit value comprises: Controlling the opening of the throttling device to reduce a first opening value; Determining whether the pressure ratio is less than or equal to the pressure ratio lower limit; Ending the control process according to the pressure ratio being greater than the pressure ratio lower limit; Acquiring the exhaust superheat of the compressor according to the pressure ratio being less than or equal to the pressure ratio lower limit value; Determining whether the exhaust gas superheat is greater than or equal to a superheat upper limit value; According to the exhaust superheat being less than the superheat upper limit value, the opening of the throttling device is controlled to be reduced to a second opening value, and it is determined whether the pressure ratio is less than or equal to the pressure ratio lower limit value; and according to the exhaust superheat being greater than or equal to the superheat upper limit value, the opening of the throttling device is stopped from being reduced.

10. The control method of the air conditioner according to claim 9, wherein: The first opening value is equal to the second opening value; Alternatively, an absolute value of a difference between the first opening value and the second opening value is negatively correlated with the exhaust superheat.

11. The control method of the air conditioner according to claim 2, wherein: The step of executing a preset control instruction according to the pressure ratio being less than or equal to the pressure ratio lower limit value comprises: According to the air conditioner being in cooling mode, firstly controlling the indoor fan to lower the wind speed, until the wind speed of the indoor fan drops to the lowest speed, and then controlling the outdoor fan to lower the wind speed; Or, according to the air conditioner being in the heating mode, the outdoor fan is first controlled to lower the wind speed, until the wind speed of the outdoor fan drops to the lowest speed, and then the indoor fan is controlled to lower the wind speed.

12. An air conditioner, wherein: The air conditioner comprises: A compressor, an indoor fan, an outdoor fan, a throttling device, an electric auxiliary heating device, a first pressure sensor, a second pressure sensor and a control device; The first pressure sensor is arranged in the exhaust pipeline of the compressor and is used to detect the exhaust pressure of the compressor. The second pressure sensor is arranged in the return air pipeline of the compressor and is used to detect the return air pressure of the compressor. The control device is electrically connected to the compressor, the indoor fan, the outdoor fan, the throttling device, the electric auxiliary heating device, the first pressure sensor, and the second pressure sensor. The control device is used to calculate the pressure ratio according to the exhaust pressure and the return air pressure, and control the operation of the air conditioner according to the control method of the air conditioner as described in any one of claims 1 to 11.

13. A computer storage medium, wherein: Computer-readable instructions are stored on the computer storage medium. When the computer-readable instructions are read by one or more processors, the one or more processors execute the air conditioner control method according to any one of claims 1 to 11.

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