CN117870110A

CN117870110A - Air conditioner control method, air conditioner and computer readable storage medium

Info

Publication number: CN117870110A
Application number: CN202410171488.8A
Authority: CN
Inventors: 纪名俊; 廖潜; 王雷; 陈熙
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2024-02-06
Filing date: 2024-02-06
Publication date: 2024-04-12

Abstract

The application provides an air conditioner control method, an air conditioner and a computer readable storage medium. The air conditioner includes a compressor and an expansion valve. The air conditioner control method comprises the following steps: when a first instruction is received, taking the current moment as a first moment, controlling the frequency of the compressor to be increased to a preset frequency, and controlling the opening of the expansion valve to be a preset opening; after the second moment, controlling the frequency of the compressor to be increased to a target upper limit frequency; the first time and the second time are separated by a first preset time length; the target upper limit frequency is larger than a preset frequency; after the third moment, controlling the opening degree of the expansion valve to be reduced to a target opening degree; the third time is later than the second time and is later than the time when the frequency of the compressor reaches the target upper limit frequency; the target opening is smaller than the preset opening. The air conditioner control method can realize the rapid cooling and rapid heating functions of the air conditioner, and enables the compressor in the air conditioner to have good oil return effect.

Description

Air conditioner control method, air conditioner and computer readable storage medium

Technical Field

The present disclosure relates to the field of air conditioning technologies, and in particular, to an air conditioning control method, an air conditioner, and a computer readable storage medium.

Background

In the related art, in order to ensure the driving and oil returning stability of the compressor, the starting mode of the air conditioner is to control the low-frequency starting of the compressor, and gradually increase the frequency of the compressor to the target upper limit frequency. Therefore, the air conditioner has low temperature rising and reducing rate, so that the refrigerating and heating comfort is poor. Therefore, a control method of an air conditioner is needed to increase the rate of temperature increase and decrease.

Disclosure of Invention

In view of this, the present application provides an air conditioner control method, an air conditioner, and a computer readable storage medium, which enable a compressor to have a good oil return effect while realizing an air conditioning cooling and heating function.

A first aspect of the present application provides an air conditioner control method. The air conditioner includes a compressor and an expansion valve. The air conditioner control method comprises the following steps: when a first instruction is received, taking the current moment as a first moment, controlling the frequency of the compressor to be increased to a preset frequency, and controlling the opening of the expansion valve to be a preset opening; after the second moment, controlling the frequency of the compressor to be increased to a target upper limit frequency; the first time and the second time are separated by a first preset time length; the target upper limit frequency is larger than a preset frequency; after the third moment, controlling the opening degree of the expansion valve to be reduced to a target opening degree; the third time is later than the second time and is later than the time when the frequency of the compressor reaches the target upper limit frequency; the target opening is smaller than the preset opening.

In an embodiment, before controlling the frequency of the compressor to be increased to a preset frequency and controlling the opening of the expansion valve to be a preset opening, the method further includes: acquiring the operation time of an air conditioner; and when the running time is less than or equal to a preset time threshold, executing the steps of controlling the frequency of the compressor to be increased to a preset frequency and controlling the opening of the expansion valve to be a preset opening.

In an embodiment, after the second time, before controlling the frequency of the compressor to be increased to the target upper limit frequency, the method includes: calculating a temperature deviation value according to the indoor temperature and the target temperature; and determining the target upper limit frequency according to the temperature deviation value.

In one embodiment, determining the target upper limit frequency from the temperature deviation value includes: when the temperature deviation value is greater than or equal to a preset temperature difference threshold value, determining an upper limit frequency corresponding to the outdoor temperature as a target upper limit frequency; when the temperature deviation value is smaller than a preset temperature difference threshold value, subtracting a preset value from the upper limit frequency corresponding to the outdoor temperature to obtain a target upper limit frequency.

In an embodiment, before controlling the opening degree of the expansion valve to decrease to the target opening degree, the method further includes: determining a target opening according to the target upper limit frequency; the target upper limit frequency and the target opening degree are in positive correlation.

In one embodiment, determining the target opening according to the target upper limit frequency includes: calculating a first frequency deviation value according to the target upper limit frequency and a preset reference frequency; determining a target adjustment parameter according to the first frequency deviation value, the preset frequency deviation value and the preset opening deviation value, wherein the target adjustment parameter and the first frequency deviation value are in positive correlation; and determining the target opening according to the preset reference opening and the target adjustment parameter.

In one embodiment, controlling the frequency of the compressor to be increased to a target upper limit frequency includes: and controlling the frequency of the compressor to be increased to the target upper limit frequency according to the preset step length.

In an embodiment, the air conditioner control method further includes: after the fourth time, obtaining the exhaust superheat degree, and controlling the opening of the expansion valve according to the exhaust superheat degree; the fourth time is later than the third time.

A second aspect of the present application provides an air conditioner, comprising: a compressor, an expansion valve, a memory, a processor, and a computer program stored in the memory and operable on an air conditioner. The processor, when executing the computer program, implements the steps of the air conditioner control method as set forth in any one of the above.

A third aspect of the present application provides a computer-readable storage medium storing a computer program. The computer program when executed by a processor implements the steps of the air conditioner control method as set forth in any one of the above.

According to the air conditioner control method, when the first instruction is received, the current moment is taken as the first moment, the frequency of the compressor is controlled to be increased to the preset frequency, and the opening of the expansion valve is controlled to be the preset opening, so that preliminary preparation is made for achieving high-frequency starting of the compressor. Then, after a second moment which is spaced from the first moment by a first preset time length, controlling the frequency of the compressor to continuously increase to a target upper limit frequency, wherein the target upper limit frequency is larger than the preset frequency, so that high-frequency starting is realized, and the heating or cooling speed of the air conditioner is increased. Further, after a third time later than the second time, the opening of the expansion valve is controlled to be reduced to a target opening, wherein the target opening is smaller than a preset opening, so that a high-low pressure difference is established in the later stage of high-frequency starting, and the subsequent control of the superheat degree of exhaust is facilitated. And because the third moment is later than the moment that the frequency of the compressor reaches the target upper limit frequency, the operation is continued for a period of time in a state that the opening of the expansion valve is the preset opening after the frequency of the compressor is increased to the target frequency, thereby ensuring that the compressor has good oil return effect at the initial stage of high-frequency starting and providing a stable compressor frequency foundation for the next step of pressure difference establishment. In summary, the air conditioner control method provided by the application can quickly realize the high-frequency starting of the compressor so that the compressor has good oil return effect while the air conditioner is cooled and heated.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are required for the embodiments will be briefly described, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of protection of the present application. Like elements are numbered alike in the various figures.

Fig. 1 is a schematic application scenario diagram of an air conditioner control method according to an embodiment of the present application.

Fig. 2 is a flow chart of an air conditioner control method according to an embodiment of the present application.

Fig. 3 is a schematic diagram of partial steps of an air conditioner control method provided in an embodiment of the present application before step S202 is performed.

Fig. 4 is a flow chart of the substeps of step S302 according to an embodiment of the present application.

Fig. 5 is a flow chart of the substeps of determining a target opening according to a target upper limit frequency provided in an embodiment of the present application.

Fig. 6 is a graph showing a compressor frequency variation and an expansion valve opening variation when the air conditioner control method is applied according to an embodiment of the present application.

Fig. 7 is a block diagram of a control device according to an embodiment of the present application.

Fig. 8 is a block diagram of a computer readable storage medium according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

It is noted that when one component is considered to be "connected" to another component, it may be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "rear," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments will be described below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Based on the above, the application provides an air conditioner control method, which realizes the air conditioner cooling and heating functions and simultaneously ensures that the compressor has good oil return effect.

In order to better understand the air conditioner control method provided by the embodiment of the present application, an application scenario of the air conditioner control method of the present application is first described below.

Fig. 1 is a schematic application scenario diagram of an air conditioner control method according to an embodiment of the present application. The air conditioner control method is applied to the air conditioner 100. The air conditioner 100 includes, but is not limited to: a communication bus 110, a memory 111, and at least one processor 112, a compressor 113, a condenser 114, a fan 115, an evaporator 116, a sensor 117, and an expansion valve 118.

In some embodiments, the processor 112 may be in communication with the memory 111, the compressor 113, the fan 115, the sensor 117, and the expansion valve 118 via the communication bus 110.

The air conditioner 100 may be any one of a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, a central air conditioner, a vehicle-mounted air conditioner, a mobile air conditioner, and the like. In some embodiments, the air conditioner 100 includes two parts, an indoor unit and an outdoor unit, installed inside and outside the preset space, respectively. For example, the indoor unit is installed in a user house, and the outdoor unit is installed outside the user house. The indoor unit and the outdoor unit are connected through a pipeline and an electric wire.

In other embodiments, the air conditioner 100 may be a mobile air conditioner that integrates an indoor unit and an outdoor unit, and is movably disposed in a predetermined space, for example, in a caravan.

In some embodiments, the compressor 113 is configured to compress gas to change a low pressure refrigerant to a high pressure refrigerant. The compressor 113 provides heat absorption from the high temperature environment and heat release to the low temperature environment for the refrigerant (i.e., refrigerant), and helps the refrigerant circulation to proceed smoothly. Common compressors 113 include scroll compressors, rotor compressors, and the like.

The condenser 114 is one of the main heat exchange devices of the air conditioner 100. In the cooling mode, the task of the condenser 114 is to condense the refrigerant from a gas to a liquid, giving off heat; in heating mode, the duty of the condenser 114 is that the refrigerant evaporates from a liquid to a gas, absorbing heat.

The fan 115 corresponding to the condenser 114 is used for radiating heat or cold energy radiated from the condenser 114.

The evaporator 116 is one of the main heat exchange devices of the air conditioner 100. In the cooling mode, the evaporator 116 evaporates the refrigerant from a liquid to a gas, absorbing heat; in the heating mode, the evaporator 116 condenses the refrigerant from a gas to a liquid, giving off heat.

The expansion valve 118 is used to change the high-pressure refrigerant into a low-pressure refrigerant.

The compressor 113, the condenser 114, the evaporator 116 and the expansion valve 118 are four components of the air conditioner 100, and together constitute a refrigeration system in the air conditioner 100.

The sensor 117 is used to detect temperature. In some embodiments, the sensor 117 may sample the temperature of each critical node in the refrigeration system, for example, may be disposed at the air intake of the condenser 114, for detecting the temperature of the air intake of the condenser 114. The sensor 117 may also be disposed at the air inlet of the evaporator 116 for detecting the temperature of the air inlet of the evaporator 116. The sensor 117 is also used to collect ambient temperature.

Fig. 1 is merely an example of an air conditioner 100 and is not intended to be limiting, and in other embodiments, the air conditioner 100 may include more or fewer components than shown, or may combine certain components, or may replace different components, e.g., the air conditioner 100 may further include an air deflector, a display screen, an air filter, a drive motor, etc.

Referring to fig. 2, fig. 2 is a flowchart of an air conditioner control method according to an embodiment of the present application. It is understood that the air conditioner control method may be applied to the air conditioner 100 and executed by the processor 112. The air conditioner control method comprises the following steps:

step S201: when a first instruction is received, the current moment is taken as a first moment, the frequency of the compressor is controlled to be increased to a preset frequency, and the opening of the expansion valve is controlled to be a preset opening.

In some embodiments, the first instruction may be an instruction to initiate a polar mode.

In some embodiments, the polar mode may be referred to as a MAX mode. In this mode, the processor controls the compressor to operate at a maximum operating frequency on the one hand and controls the fan to operate at a maximum power on the other hand, so that the air conditioner adjusts the indoor temperature to the target temperature at the fastest speed.

The target temperature may be a highest temperature/lowest temperature set in advance, or the target temperature may be a set temperature set by a user.

In some embodiments, the polar mode may be a sub-mode after the user selects the main mode. For example, when the main mode is the cooling mode, after receiving a first instruction that a user starts the extreme mode, the processor in the air conditioner may execute the air conditioner control method provided by the application to enable the air conditioner to reduce the indoor temperature to the target temperature at the fastest speed; when the main mode is a heating mode, after the air conditioner receives a first instruction of a user to start a polar mode, a processor in the air conditioner executes the air conditioner control method provided by the application so that the air conditioner can raise the indoor temperature to the target temperature at the highest speed.

In other embodiments, the first instruction may also be an instruction to activate an air conditioner. For example, when the air conditioner can only cool, the processor can execute the air conditioner control method provided by the application to cool down quickly after receiving the first instruction; when the air conditioner can only heat, the processor can execute the air conditioner control method provided by the application to quickly heat after receiving the first instruction.

In some embodiments, the first instruction may be an instruction generated by the air conditioner in response to an operation (e.g., a touch operation, a key operation, or a wireless control operation, etc.) of the user.

In other embodiments, the first instruction may also be an instruction sent by other terminal devices to the air conditioner. For example, a user may operate on an Application (APP) within a cell phone; the mobile phone can respond to the operation of a user and send a first instruction to the air conditioner.

In some embodiments, the processor, upon receiving the first instruction, may obtain a timestamp of the current time to record a specific time of the first time.

In step S201, the preset frequency may be a higher frequency. For example, the preset frequency may be greater than or equal to 50Hz (units: hertz) and less than or equal to 80Hz. For example, when the air conditioner is in the cooling mode, the preset frequency may be 58Hz; when the air conditioner is in the heating mode, the preset frequency may be 66Hz. The specific value of the preset frequency is not limited in the embodiment of the present application.

It will be appreciated that the conventional start-up frequency of the compressor is typically 10Hz to 20Hz. In step S201, in order to achieve the purpose of rapid cooling or rapid heating, the starting frequency of the compressor is increased to a preset frequency (e.g. 50Hz-80 Hz), so as to provide a basis for continuously increasing the frequency of the compressor, and ensure the reliability of rapid heating or cooling.

In step S201, in order to ensure that the compressor has a better oil return effect, the preset opening may be a larger opening. For example, when the air conditioner is in the cooling mode, the preset opening degree may be 300B (unit: step); the preset frequency may be 260B when the air conditioner is in the heating mode.

In some embodiments, when it is detected that the frequency of the compressor has been increased to the preset frequency within a first frequency-increasing period (e.g., 4 seconds) from the receipt of the first instruction, step S202 may be continued; and stopping continuously executing the step S202 and reporting an error when the fact that the frequency of the compressor is not increased to the preset frequency in the first frequency-increasing time period from the receiving of the first instruction is detected.

The first frequency-raising duration can be set according to actual requirements. For example, the first up-conversion period may be set to 4 seconds, 5 seconds, 10 seconds, or the like.

It will be appreciated that the frequency of the compressor of a typical air conditioner may rise to a preset frequency in a short period of time (less than the first frequency rise period). Therefore, if in step S201, the frequency of the compressor cannot reach the preset frequency within the first frequency-increasing duration, which indicates that there may be a corresponding fault in the air conditioner, and the fault is reported and the operation is stopped, so that the safety and reliability of the air conditioner can be ensured.

Step S202: after the second moment, controlling the frequency of the compressor to be increased to a target upper limit frequency; the first time and the second time are separated by a first preset time length; the target upper limit frequency is greater than a preset frequency.

In some embodiments, the target upper limit frequency may be a predetermined frequency.

In other embodiments, the target upper limit frequency may be calculated based on the indoor temperature at the second time and the target temperature. At this time, the target upper limit frequency is used to characterize the desired operating frequency of the compressor calculated based on the temperature difference between the indoor temperature at the second time and the target temperature, and is less than or equal to the upper limit frequency (which may also be referred to as a theoretical upper limit frequency, a limit operating frequency, or the like) at which the compressor is permitted to operate.

In step S202, since the target upper limit frequency is greater than the preset frequency, the frequency of the compressor is further increased, so as to increase the speed of heating up or cooling down.

Understandably, since the compressor is operated at a high frequency, the energy consumption of the air conditioner is increased on the one hand, and the noise of the air conditioner is increased on the other hand. Therefore, in some embodiments, at the second moment, the target upper limit frequency can be determined according to the temperature difference between the indoor temperature and the target temperature, so that the energy consumption and the noise of the air conditioner are reduced as much as possible by selecting the appropriate target upper limit frequency while the temperature is quickly increased or decreased, and the user experience is better improved.

And compared with the method for directly controlling the frequency of the compressor to be increased to the target upper limit frequency, the method for controlling the frequency of the compressor to be increased to the preset frequency is beneficial to improving the running stability of the compressor after the compressor is controlled to be increased to the target upper limit frequency for a period of time.

In some embodiments, the duration between the first time and the second time may be 30 seconds. In other embodiments, the duration between the first time and the second time may also be other values, such as 40 seconds, 50 seconds, etc., and the present application does not specifically limit the duration between the first time and the second time.

In some embodiments, when it is detected that the frequency of the compressor has been increased to the target upper limit frequency within a second up-conversion period (e.g., 10 seconds) from the second time, step S203 may be continued; when it is detected that the frequency of the compressor has not been increased to the preset frequency within the second frequency-increasing period (e.g., 10 seconds) from the second time, the execution of step S203 is stopped, and an error is reported.

The second frequency-raising duration can be set according to actual requirements. For example, the second up-conversion period may be set to 10 seconds, 15 seconds, 20 seconds, or the like.

Step S203: after the third moment, controlling the opening degree of the expansion valve to be reduced to a target opening degree; the third time is later than the second time and is later than the time when the frequency of the compressor reaches the target upper limit frequency; the target opening is smaller than the preset opening.

In step S203, the opening degree of the expansion valve is controlled to decrease from the preset opening degree to the target opening degree, so that after the compressor reaches the target upper limit frequency to realize high-frequency start, the pressure difference is continuously established for the next step, and preparation is made for entering the exhaust superheat degree control.

As can be appreciated, since the opening degree of the expansion valve and the frequency of the compressor may jointly affect the heating/cooling capacity and the energy efficiency of the air conditioner, the target opening degree may be determined according to the target upper limit frequency in step S203 so that the air conditioner maintains a superior energy efficiency.

In step S203, since the third time is later than the time when the frequency of the compressor reaches the target upper limit frequency, after the frequency of the compressor rises to the target upper limit frequency, the expansion valve can also operate for a period of time based on the preset opening, so that a better oil return effect can be maintained at the initial stage of the compressor for realizing high-frequency starting (that is, the frequency of the compressor rises to the target upper limit frequency), and a stable compressor frequency basis is provided for controlling the opening of the expansion valve to fall to the target opening, thereby facilitating the stable operation of the air conditioner.

In some embodiments, the duration between the first time and the third time may be 60 seconds. In other embodiments, the duration between the first time and the third time may also be other values, such as 70 seconds, 80 seconds, etc., and the present application does not specifically limit the duration between the first time and the third time.

In some embodiments, the air conditioner control method further comprises:

after the fourth time, obtaining the exhaust superheat degree, and controlling the opening of the expansion valve according to the exhaust superheat degree; the fourth time is later than the third time.

The exhaust superheat degree (Discharge Superheat, abbreviated as DSH) is obtained by subtracting the saturation temperature corresponding to the exhaust pressure from the detected exhaust temperature.

In some embodiments, the discharge end of the compressor is provided with a temperature sensor and/or a pressure sensor, through which a discharge superheat signal may be acquired.

In other embodiments, the exhaust superheat may be obtained by other means (e.g., other sensors), and the present application is not limited to a specific way of obtaining the exhaust superheat.

Understandably, the degree of superheat of the air conditioner is an important parameter for controlling the opening degree of the expansion valve. When the exhaust superheat degree of the air conditioner is increased, the opening degree of the expansion valve is increased to increase the circulation quantity of the refrigerant; when the superheat degree of the air conditioner exhaust is reduced, the opening of the expansion valve is required to be reduced so as to avoid the problems of liquid return and wet compression of the compressor. Therefore, after the high-frequency start is completed, the processor can control the opening degree of the expansion valve according to the degree of superheat of the exhaust gas to maintain stable operation of the air conditioner.

In some embodiments, after the superheat of the discharge gas is obtained, a feedback adjustment or other means may be used to control the opening of the expansion valve, thereby adjusting the flow rate of the refrigerant. The specific control method is not limited in this application.

In some embodiments, the duration between the third time and the fourth time may be 120 seconds. In other embodiments, the duration between the third time and the fourth time may also be other values, such as 150 seconds, 180 seconds, etc., and the duration between the fourth time and the third time is not specifically limited in this application.

Thus, in the present embodiment, after the fourth time, the degree of superheat of the exhaust gas is obtained and the opening degree of the expansion valve is controlled according to the degree of superheat of the exhaust gas, so as to obtain a better refrigerating capacity and maintain a higher energy efficiency.

In some embodiments, before performing step S201, the air conditioner control method further includes:

and acquiring the operation time length of the air conditioner, and executing the steps of controlling the frequency of the compressor to be increased to a preset frequency and controlling the opening of the expansion valve to be a preset opening when the operation time length is smaller than or equal to a preset time length threshold value.

The operation time of the air conditioner refers to the time from the time when the air conditioner is started up to the present. The preset duration threshold may be used to characterize the duration required from when the air conditioner is started to when the air conditioner is in a steady state operation.

It is understood that in the case where the air conditioner is not started or is started soon, the air conditioner is not in a stable state yet, at this time, if the user needs to perform rapid cooling or heating, steps S201 to S203 are required to be performed, and the high frequency starting function is turned on. And when the air conditioner has been operated for a period of time in a steady state, the processor may directly control the frequency of the compressor to rise to the target upper limit frequency without performing steps S201 to S203.

Taking the actual usage scenario as an example, in an ideal case, when the user touches the MAX mode key during startup, it indicates that the user needs to start the high-frequency startup function, and the processor receives the first instruction at this time, and executes steps S201 to S203.

However, in other scenarios, it may be the case that the user initiates the false triggering of the other mode, followed by a switch to trigger the MAX mode. At this time, the user does not start in MAX mode, but the user actually wants to start in MAX mode. And in other scenarios it may be the case that the user has been operating in other modes for a long time and then switched to MAX mode again. At this time, the air conditioner compressor is already in a stable running state, and the compressor frequency is directly increased to the target upper limit frequency without running a high-frequency starting process (i.e. executing steps S201 to S203).

Therefore, in the present embodiment, the operation time period of the air conditioner is compared with the preset time period threshold value to distinguish the above two cases. When the first instruction is received and the operation duration is less than or equal to the preset duration threshold, it indicates that the air conditioner may not enter the stable operation state at present, and the above steps S201 to S203 may be executed at this time, so that the compressor is started at high frequency, thereby realizing rapid heating or cooling. When the running time length is greater than the preset time length threshold, the air conditioner is indicated to be in a stable running state at present, and the frequency of the compressor is directly controlled to be increased to the target upper limit frequency.

In some embodiments, the preset duration threshold may be a second preset duration. The second preset duration is a duration between the first time and the fourth time.

In other embodiments, the preset duration threshold may be set to other durations, for example, longer or shorter than the second preset duration, which is not limited in the present application, and in other embodiments, the specific duration of the preset duration threshold may be adjusted based on the performance of the compressor and the expansion valve.

Further, in some embodiments, before performing step S201, the air conditioner control method further includes:

acquiring the operation time length, the outdoor temperature and the indoor temperature of the air conditioner, and executing the steps of controlling the frequency of the compressor to be increased to a preset frequency and controlling the opening of the expansion valve to be a preset opening when the outdoor temperature and the indoor temperature meet preset conditions and the operation time length is smaller than or equal to a preset time length threshold value.

The preset conditions comprise: when the air conditioner is in a refrigeration mode, the outdoor temperature is greater than a first temperature threshold and less than a second temperature threshold; when the air conditioner is in the heating mode, the outdoor temperature is less than the third temperature threshold, and the indoor temperature is less than the fourth temperature threshold.

It is understood that the air conditioner is mainly affected by the outdoor temperature when operating in the cooling mode. When the outdoor temperature is too high, high-frequency starting is performed, and overshoot phenomenon is easy to occur; when the outdoor temperature is too low, high-frequency starting is performed, and the inner coil is easily frozen due to low system pressure. Moreover, when the air conditioner works in the refrigerating mode, the outdoor temperature is low, high-frequency starting is not needed, and the compressor can be started according to the conventional mode to meet the cooling requirement of a user. Thus, when the air conditioner is in the cooling mode, the step S201 may be executed when the outdoor temperature is greater than the first temperature threshold, the outdoor temperature is less than the second temperature threshold, and the operation duration is less than or equal to the preset duration threshold, so that the high-frequency start of the compressor achieves a better effect.

When the air conditioner works in a heating mode, the indoor and outdoor temperature needs to be lower than a certain value to start the high-frequency starting function in order to achieve both reliability and comfort. Therefore, when the air conditioner is in the heating mode, the step S201 may be performed when the outdoor temperature is less than the third temperature threshold, the indoor temperature is less than the fourth temperature threshold, and the operation duration is less than or equal to the preset duration threshold.

In some embodiments, the first temperature threshold may be 28 ℃ (in degrees celsius), the second temperature threshold may be 40 ℃, the third temperature threshold may be 15 ℃, and the fourth temperature threshold may be 22 ℃.

In other embodiments, the first temperature threshold, the second temperature threshold, the third temperature threshold, and the fourth temperature threshold may be set to other values according to the requirements of the actual scenario, and are not limited thereto. For example, the first temperature threshold may also be set at 26 ℃, 27 ℃, etc.

Thus, in this embodiment, by setting the high-frequency starting condition, the high-frequency starting achieves a better effect, and the energy efficiency of the air conditioner is improved.

Referring to fig. 3, in some embodiments, before performing step S202, the air conditioner control method further includes:

step S301: and calculating a temperature deviation value according to the indoor temperature and the target temperature.

The target temperature may be a temperature set by a user, or may be a temperature that is calculated by the processor or the upper computer according to current environmental data (for example, indoor temperature and humidity) or historical data (for example, user preference temperature, etc.) and is finally reached after the air conditioner is started.

In some embodiments, the absolute value of the difference of the indoor temperature minus the target temperature may be taken as the temperature deviation value.

Step S302: and determining the target upper limit frequency according to the temperature deviation value.

It is understood that when the temperature deviation is larger, the target upper limit frequency of the compressor may be higher at this time to achieve the temperature rise or fall faster, so that the indoor temperature reaches the target temperature as soon as possible. As such, in some embodiments, the temperature deviation may be positively correlated to the target upper frequency.

In some embodiments, the reference upper limit frequency may be determined based on a preset frequency and a temperature deviation value, and the reference upper limit frequency may be subjected to a clipping process to obtain the target upper limit frequency. For example, the result of multiplying the preset frequency by the temperature deviation value may be taken as the reference upper limit frequency. The limiting process may be performed on the reference upper limit frequency, where the reference upper limit frequency is set as a target upper limit frequency when the reference upper limit frequency is less than or equal to an upper limit frequency at which the compressor is allowed to operate; when the reference upper limit frequency is greater than the upper limit frequency at which the compressor is allowed to operate, the upper limit frequency at which the compressor is allowed to operate is taken as a target upper limit frequency.

In other embodiments, the frequency coefficient may also be determined according to the temperature deviation value, where the frequency coefficient has a positive correlation with the temperature deviation value, and the frequency coefficient is less than or equal to 1. The frequency coefficient may then be multiplied by the upper limit frequency at which the compressor is allowed to operate, resulting in a target upper limit frequency.

In other embodiments, the target upper limit frequency may also be determined based on the temperature deviation value and other calculations. The specific calculation method for determining the target upper limit frequency according to the temperature deviation value in step S302 is not limited in the present application.

Thus, by executing steps S301 to S302, the operating frequency of the compressor can be finely controlled, and the energy efficiency of the air conditioner can be improved.

Referring to fig. 4, in some embodiments, step S302 includes the following sub-steps:

step S401: and when the temperature deviation value is greater than or equal to a preset temperature difference threshold value, determining the upper limit frequency corresponding to the outdoor temperature as a target upper limit frequency.

It is understood that when the temperature deviation value is large, that is, the temperature deviation value is greater than or equal to the preset temperature difference threshold value, the compressor is operated at the upper limit frequency of the allowable operation of the compressor, so that rapid temperature rise or temperature reduction can be realized.

The preset temperature difference threshold value can be set according to actual requirements. For example, the preset temperature difference threshold may be set to 4 ℃, 6 ℃, 8 ℃, etc.

The normal operation of the compressor can be influenced by the outdoor temperature, and different upper limit frequencies can be set for the compressor corresponding to different outdoor temperatures so as to ensure the normal operation of the compressor. For example, after the processor acquires the outdoor temperature, the upper limit frequency of the compressor allowed to operate corresponding to the outdoor temperature can be determined through table look-up or function calculation. Therefore, the target upper limit frequency is determined according to the upper limit frequency corresponding to the outdoor temperature, so that the safe and stable operation of the air conditioner can be ensured, and the rapid temperature rise or temperature reduction can be realized.

In some embodiments, the upper limit frequency corresponding to the outdoor temperature may also be a typical value set in advance. For example, the upper limit frequency corresponding to the outdoor temperature may be 78Hz or the like. The present application does not limit the specific value of the upper limit frequency corresponding to the outdoor temperature, and a person skilled in the art can adjust according to the actual performance parameter of the air conditioner and the outdoor temperature.

Therefore, when the temperature deviation value is larger than or equal to the preset temperature difference threshold value, the upper limit frequency corresponding to the outdoor temperature is determined to be the target upper limit frequency, and the air conditioner can be ensured to safely and stably operate while the temperature of the air conditioner is rapidly increased or reduced.

Step S402: when the temperature deviation value is smaller than a preset temperature difference threshold value, subtracting a preset value from the upper limit frequency corresponding to the outdoor temperature to obtain a target upper limit frequency.

It is understood that the air conditioner consumes more energy when the compressor is operated at high frequency, so that when the temperature deviation value is small, that is, the temperature deviation value is smaller than the preset temperature difference threshold value, the frequency can be appropriately reduced on the basis of the upper limit frequency of the allowable operation of the compressor, so that the energy efficiency of the air conditioner can be improved.

In some embodiments, the preset value may be a constant, such as 10Hz. In other embodiments, the preset value may be replaced by a frequency adjustment value calculated according to the temperature difference deviation value. For example, a value obtained by subtracting the temperature deviation value from the preset temperature difference threshold value may be used as the temperature deviation value. And then calculating according to the temperature difference deviation value and the frequency adjustment step length to obtain a frequency adjustment value. And then subtracting the frequency adjustment value from the upper limit frequency corresponding to the outdoor temperature to obtain the target upper limit frequency. In this way, finer frequency control of the compressor can be achieved based on the temperature deviation value.

In summary, by executing step S401 and step S402, frequency control of the compressor can be achieved.

In some embodiments, before performing step S203, the air conditioner control method further includes:

determining a target opening according to the target upper limit frequency; and the target upper limit frequency and the target opening degree are in positive correlation.

It is understood that the compressor provides heat absorption from the high temperature environment and heat release from the low temperature environment for the refrigerant, helps the refrigerant circulation to be smooth, and the expansion valve is used for changing the high pressure refrigerant into the low pressure refrigerant to determine the circulation times. Thus, the compressor and the expansion valve work cooperatively to affect the heat or cold released by the air conditioner. Therefore, in the present embodiment, the target opening degree is determined according to the target upper limit frequency, and the heat or cold released by the air conditioner can be increased as much as possible while the preset opening degree is reduced to the target opening degree to establish the high-low pressure difference, thereby improving the energy efficiency of the air conditioner.

The specific calculation method for determining the target opening according to the target upper limit frequency is not limited, and only the target upper limit frequency and the target opening are required to be in positive correlation, and the target upper limit frequency and the target opening are synchronously controlled, so that the pressure difference is established in the step S203, and meanwhile, heat or cold is released as much as possible, so that the energy efficiency of the air conditioner is improved.

With continued reference to fig. 5, in some embodiments, determining the target opening from the target upper limit frequency includes the sub-steps of:

step S501: and calculating a first frequency deviation value according to the target upper limit frequency and the preset reference frequency.

The preset reference frequency can be the frequency of the corresponding compressor when the air conditioner releases preset heat or preset cold and the energy efficiency is optimal. Correspondingly, when the air conditioner releases preset heat or preset cold and the energy efficiency is optimal, the opening of the corresponding expansion valve is a preset reference opening.

In some embodiments, the preset reference frequency and the preset reference opening degree may be preset.

The first frequency deviation value is used for representing a difference between the target upper limit frequency and a preset reference frequency.

In some embodiments, a difference obtained by subtracting the preset reference frequency from the target upper limit frequency may be used as the first frequency deviation value.

Step S502: and determining a target adjustment parameter according to the first frequency deviation value, the preset frequency deviation value and the preset opening deviation value, wherein the target adjustment parameter and the first frequency deviation value are in positive correlation.

The target adjustment parameter may be used to characterize an opening variation of the target opening compared to a preset reference opening.

In step S502, the preset frequency deviation value and the preset opening deviation value are data corresponding to each other. That is, two preset frequencies may be predetermined, and the preset frequency deviation value represents a difference between the two preset frequencies. The preset opening deviation value represents the deviation between two openings, the two openings are the openings corresponding to the conditions that the air conditioner works at two preset frequencies and the air conditioner energy efficiency is optimal. Thus, in step S502, a base opening deviation value corresponding to each unit frequency deviation value may be calculated according to the preset opening deviation value and the preset frequency deviation value. And then, according to the basic opening deviation value and the first deviation value, the target adjustment parameter is obtained.

In some embodiments, the target adjustment parameter may be determined according to the following formula

Wherein k represents a target adjustment parameter; a represents a first frequency offset value; b represents a preset frequency deviation value; h represents a preset opening deviation value.

The specific formula for determining the target adjustment parameter in step S502 is not limited in this application. In other embodiments, the above formula may be modified (e.g. by adding a constant parameter) or other formulas based on experimental data or performance parameters of the air conditioner, so as to calculate the target adjustment parameter according to the first frequency deviation value, the preset frequency deviation value, and the preset opening deviation value.

Step S503: and determining the target opening according to the preset reference opening and the target adjustment parameter.

In some embodiments, the sum between the preset reference opening and the target adjustment parameter may be calculated as the target opening.

In summary, by executing steps S501 to S503, a suitable target opening degree can be calculated from the target upper limit frequency.

For example, in some embodiments, the preset reference frequency may be a frequency of the compressor when the air conditioning energy efficiency is optimal, and the air conditioning cooling capacity (or heating capacity) is half of the maximum cooling capacity (or maximum heating capacity). Correspondingly, the preset reference opening is half of the maximum refrigerating capacity (or heating capacity) of the air conditioner, and the opening of the expansion valve is the opening when the air conditioner energy efficiency is optimal. The preset frequency deviation value is the difference between the preset maximum frequency and the preset reference frequency. And the preset maximum frequency is the frequency of the compressor when the air conditioner refrigerating capacity (or heating capacity) is the maximum refrigerating capacity (or the maximum heating capacity) and the air conditioner energy efficiency is optimal. The preset opening deviation value is the difference between the preset maximum opening and the preset reference opening. And the preset maximum opening is the opening of the expansion valve when the air conditioner energy efficiency is optimal, and the air conditioner refrigerating capacity (or heating capacity) is the maximum refrigerating capacity (or the maximum heating capacity). Thus, the preset reference frequency, the preset reference opening, the preset frequency deviation value and the preset opening deviation value can be obtained based on the conditions, so that the target opening is calculated.

It is to be understood that the specific conditions for determining the preset reference frequency, the preset reference opening, the preset frequency deviation value and the preset opening deviation value are not limited in the present application, in other embodiments, the preset cooling capacity (or the preset heating capacity) released by the air conditioner may also be obtained according to the performance parameter and the actual running condition of the air conditioner, and the compressor frequency and the expansion valve opening when the air conditioner energy efficiency is optimal are respectively used as the preset reference frequency and the preset reference opening (the preset maximum frequency and the preset maximum opening).

It is understood that in some embodiments, the preset reference frequency, the preset reference opening, the preset frequency deviation value, and the preset opening deviation value may be preset in the processor or the memory; in other embodiments, the preset reference frequency, the preset reference opening, the preset frequency deviation value and the preset opening deviation value may also be updated according to the historical operation data of the air conditioner, so that the calculated target opening better meets the requirement of the compressor during high-frequency starting.

In some embodiments, step S202 includes:

and controlling the frequency of the compressor to be increased to the target upper limit frequency according to the preset step length.

The preset step length is used for representing the frequency change amplitude of each time of the compressor. In some embodiments, the preset step size may be 1 second/Hz, or may be other values, such as 0.5 second/Hz, 2 seconds/Hz, etc.

In this embodiment, the frequency of the compressor is controlled to be increased to the target upper limit frequency according to the preset step length, so that the frequency of the compressor can reach the target upper limit frequency more smoothly.

Referring to fig. 6, fig. 6 is a graph of compressor frequency variation and a graph of expansion valve opening variation when the air conditioner control method provided by the present application is applied to an embodiment. The curve P61 is a compressor frequency variation curve, and the curve P62 is an expansion valve opening variation curve.

As can be seen from fig. 6, upon receiving the first command at the first time (e.g., 0 th second), the frequency of the compressor is controlled to be increased from 0 to a preset frequency (e.g., 58 Hz) within a preset time period (e.g., 4 seconds), while the opening degree of the expansion valve is controlled to be a preset opening degree (e.g., 300B).

At a second time (e.g., 30 seconds), the frequency of the compressor is controlled to be increased to a target upper limit frequency (e.g., 68 Hz) according to a preset step size (e.g., 1 second/Hz).

At a third time (e.g., 60 seconds), the opening degree of the expansion valve is controlled to decrease to a target opening degree (e.g., 240B).

At a fourth time (for example, 180 seconds), the degree of superheat of the exhaust gas is acquired to control the opening degree of the expansion valve in accordance with the degree of superheat of the exhaust gas. Fig. 6 does not show the compressor frequency variation curve and the expansion valve opening degree curve after the fourth time.

Thus, by executing the steps, the high-frequency starting of the compressor can be quickly realized, so that the quick heating or cooling can be realized. Meanwhile, due to cooperative control of the expansion valve, the oil return device has good oil return effect in the early stage of high-frequency starting of the compressor, and establishes high-low pressure difference by controlling the opening of the expansion valve in the later stage of high-frequency starting of the compressor, so that preparation is made for subsequent control of the superheat degree of exhaust.

Referring again to fig. 1, an air conditioner 100 is further provided in an embodiment of the present application. The air conditioner 100 includes at least a compressor 113, an expansion valve 118, a memory 111, a processor 112, and a computer program stored in the memory 111 and operable on the air conditioner 100. The processor 112 implements the air conditioner control method described in the above embodiment when executing the computer program.

It is understood that the memory 111 may be an internal memory of the air conditioner 100, i.e., a memory built in the air conditioner 100. In other embodiments, the memory 111 may be an external memory of the air conditioner 100, i.e. a memory external to the air conditioner 100.

An embodiment of the application also provides a control device applied to the air conditioner. Fig. 7 schematically shows a block diagram of a control device 200 according to an embodiment of the present application. As shown in fig. 7, the control device 200 includes:

The control module 210 is configured to, when receiving the first instruction, control the frequency of the compressor to be increased to a preset frequency and control the opening of the expansion valve to be a preset opening with the current time as the first time.

The control module 210 is further configured to control the frequency of the compressor to be increased to a target upper limit frequency after the second time; the first time and the second time are separated by a first preset time length; the target upper limit frequency is greater than a preset frequency.

The control module 210 is further configured to control the opening degree of the expansion valve to decrease to the target opening degree after the third time; the third time is later than the second time and is later than the time when the frequency of the compressor reaches the target upper limit frequency; the target opening is smaller than the preset opening.

It can be appreciated that the control module 210 is further configured to execute the air conditioner control method provided in any of the above embodiments, which is not described herein.

Specific details of the implementation of the air conditioner control method by the control device 200 provided in the embodiments of the present application have been described in detail in the embodiments of the corresponding air conditioner control method, and are not repeated here.

Referring to fig. 8, the present application also provides a computer-readable storage medium 300 having a computer program 310 stored thereon. The computer program 310, when executed by a processor, implements the air conditioning control method as in the above technical solution. The computer readable medium may take the form of a portable compact disc read only memory (CD-ROM) and include program code that can be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The program product described above may take the form of any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The computer readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).

Furthermore, the above-described drawings are only schematic illustrations of processes included in the method according to the exemplary embodiment of the present invention, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules. .

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any equivalent modifications or substitutions will be apparent to those skilled in the art within the scope of the present application, and these modifications or substitutions should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An air conditioner control method, the air conditioner comprising a compressor and an expansion valve, the method comprising:

when a first instruction is received, taking the current moment as a first moment, controlling the frequency of the compressor to be increased to a preset frequency, and controlling the opening of the expansion valve to be a preset opening;

after the second moment, controlling the frequency of the compressor to be increased to a target upper limit frequency; the first time and the second time are separated by a first preset duration; the target upper limit frequency is larger than the preset frequency;

after a third moment, controlling the opening degree of the expansion valve to be reduced to a target opening degree; the third time is later than the second time, and the third time is later than the time when the frequency of the compressor reaches the target upper limit frequency; the target opening is smaller than the preset opening.

2. The method of claim 1, wherein prior to said controlling the frequency of the compressor to be increased to a preset frequency and controlling the opening of the expansion valve to be a preset opening, the method further comprises:

acquiring the operation time of the air conditioner;

and when the running time is less than or equal to a preset time threshold, executing the steps of controlling the frequency of the compressor to be increased to a preset frequency and controlling the opening of the expansion valve to be a preset opening.

3. The method of claim 1, wherein after the second time, before controlling the frequency of the compressor to be increased to a target upper limit frequency, the method comprises:

calculating a temperature deviation value according to the indoor temperature and the target temperature;

and determining the target upper limit frequency according to the temperature deviation value.

4. A method according to claim 3, wherein said determining said target upper limit frequency from said temperature deviation value comprises:

when the temperature deviation value is greater than or equal to a preset temperature difference threshold value, determining an upper limit frequency corresponding to the outdoor temperature as the target upper limit frequency;

and when the temperature deviation value is smaller than a preset temperature difference threshold value, subtracting a preset value from the upper limit frequency corresponding to the outdoor temperature to obtain the target upper limit frequency.

5. The method of claim 1, wherein prior to said controlling the opening of the expansion valve to decrease to a target opening, the method further comprises:

determining the target opening according to the target upper limit frequency; the target upper limit frequency and the target opening degree are in positive correlation.

6. The method of claim 5, wherein the determining the target opening according to the target upper limit frequency comprises:

calculating a first frequency deviation value according to the target upper limit frequency and a preset reference frequency;

determining a target adjustment parameter according to the first frequency deviation value, a preset frequency deviation value and a preset opening deviation value, wherein the target adjustment parameter and the first frequency deviation value are in positive correlation;

and determining the target opening according to a preset reference opening and the target adjustment parameter.

7. The method of claim 1, wherein said controlling the frequency of the compressor to be increased to a target upper limit frequency comprises:

and controlling the frequency of the compressor to be increased to the target upper limit frequency according to a preset step length.

8. The method according to claim 1, wherein the method further comprises:

After a fourth time, obtaining the exhaust superheat degree, and controlling the opening of the expansion valve according to the exhaust superheat degree; the fourth time is later than the third time.

9. An air conditioner, the air conditioner comprising: a compressor, an expansion valve, a memory, a processor, and a computer program stored in the memory and operable on the air conditioner, the processor implementing the steps of the air conditioner control method according to any one of claims 1 to 8 when the computer program is executed.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the steps of the air conditioner control method according to any one of claims 1 to 8.