Control method of air conditioner and air conditioner

Abstract

This application discloses a control method and an air conditioner, belonging to the field of air conditioning technology. The control method includes: acquiring the current operating frequency of the compressor during the current start-up operation phase, and the current outdoor ambient temperature detection value from the outdoor ambient temperature sensor; determining the historical operating frequency of the compressor during historical start-up operation phases, and the historical outdoor ambient temperature detection values ​​before and after shutdown from the outdoor ambient temperature sensor, to determine a correction coefficient; correcting the current outdoor ambient temperature detection value based on the correction coefficient and the current operating frequency to obtain the outdoor ambient temperature; and then controlling the air conditioner based on the outdoor ambient temperature. By determining the degree of heat radiation received by the outdoor ambient temperature sensor at different operating frequencies of the compressor, and then correcting the current detection value of the outdoor ambient temperature sensor based on the current operating frequency of the compressor, a more accurate outdoor temperature is obtained, improving the control accuracy of the air conditioner.

Description

Technical Field

[0001] This application belongs to the field of air conditioning technology, and in particular relates to a control method for an air conditioner and an air conditioner. Background Technology

[0002] Air conditioners typically require an outdoor ambient temperature sensor to obtain the outdoor temperature during operation, and then control the system based on the user-set target indoor environment. Currently, because the outdoor ambient temperature sensor is located close to the outdoor heat exchanger, its readings are easily affected by the heat radiation from the heat exchanger. This causes a discrepancy between the outdoor temperature detected by the sensor and the actual outdoor temperature, thus affecting the control accuracy of the air conditioner. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a control method and an air conditioner, which determines the degree of thermal radiation received by the outdoor ambient temperature sensor at different operating frequencies of the compressor, and then corrects the current detection value of the outdoor ambient temperature sensor to obtain a more accurate outdoor temperature and improve the control accuracy of the air conditioner.

[0004] In a first aspect, this application provides a method for controlling an air conditioner, the air conditioner comprising:

[0005] The compressor, outdoor heat exchanger, and indoor heat exchanger are connected in a loop.

[0006] An outdoor ambient temperature sensor is integrated with the outdoor heat exchanger inside the outdoor unit;

[0007] An outdoor fan, which is installed in conjunction with an outdoor heat exchanger, is used to provide airflow to the outdoor heat exchanger.

[0008] The compressor operates through multiple start-stop cycles, which include a start-up phase and a subsequent shutdown phase.

[0009] Control methods include:

[0010] Obtain the current operating frequency of the compressor during the current startup and operation phase, and the current outdoor ambient temperature detection value of the outdoor ambient temperature sensor during the current startup and operation phase;

[0011] Determine the compressor's historical operating frequency during the historical start-up phase within the historical start-up cycle prior to the current start-up phase, as well as the outdoor temperature sensor's historical pre-shutdown outdoor temperature readings during the historical start-up phase and historical post-shutdown outdoor temperature readings during the historical shutdown phase.

[0012] The correction coefficient is determined based on the historical operating frequency, the outdoor temperature measurement value before the historical shutdown, and the outdoor temperature measurement value after the historical shutdown. The correction coefficient reflects the mapping relationship between the compressor's operating frequency and the outdoor ambient temperature deviation value. The outdoor ambient temperature deviation value is equal to the difference between the outdoor temperature measurement value before the historical shutdown and the outdoor temperature measurement value after the historical shutdown within the same start-stop cycle.

[0013] The outdoor ambient temperature is obtained by correcting the current outdoor ambient temperature detection value based on the correction factor and the current operating frequency.

[0014] The air conditioner is controlled according to the outdoor ambient temperature.

[0015] According to one embodiment of this application, the historical start-stop cycle includes a first start-stop cycle and a second start-stop cycle, and the correction factor includes a first correction factor, which is determined according to the following formula:

[0016] A1 = |(T1a-T1b)-(T2a-T2b)| ÷ |Y1-Y2|

[0017] Wherein, A1 is the first correction coefficient, T1a is the historical outdoor temperature detection value before shutdown in the first start-stop cycle, T1b is the historical outdoor temperature detection value after shutdown in the first start-stop cycle, T2a is the historical outdoor temperature detection value before shutdown in the second start-stop cycle, T2b is the historical outdoor temperature detection value after shutdown in the second start-stop cycle, Y1 is the historical operating frequency in the first start-stop cycle, and Y2 is the historical operating frequency in the second start-stop cycle.

[0018] According to one embodiment of this application, the outdoor ambient temperature is obtained by correcting the current outdoor ambient temperature detection value based on a correction factor and the current operating frequency, including:

[0019] When the air conditioner is in cooling mode, the outdoor ambient temperature is determined based on the following formula:

[0020] Tx = Tz - A × Y;

[0021] When the air conditioner is in heating mode, the outdoor ambient temperature is determined based on the following formula:

[0022] Tx = Tz + A × Y;

[0023] Where Tx is the outdoor ambient temperature, Tz is the current outdoor ambient temperature detection value, A is the correction coefficient, and Y is the current operating frequency.

[0024] According to one embodiment of this application, there are two historical start-stop cycles. The first start-stop cycle is the previous historical start-stop cycle adjacent to the current start-up and operation phase, and the second start-stop cycle is the previous historical start-stop cycle adjacent to the first start-stop cycle.

[0025] According to one embodiment of this application, when the air conditioner is powered on again or the operating mode is changed, the correction coefficient is reset to zero.

[0026] According to one embodiment of this application, the correction factor is zero during the first start-stop cycle and the second start-stop cycle after the air conditioner is first powered on or the correction factor is reset to zero.

[0027] According to one embodiment of this application, the control method further includes:

[0028] Determine the compressor's operating frequency in the first period before the compressor switches from the start-up phase to the shutdown phase;

[0029] Determine the outdoor temperature reading before the outdoor ambient temperature sensor shuts down, as soon as possible.

[0030] After the compressor enters the shutdown phase and a second period has elapsed, determine the outdoor temperature reading from the outdoor ambient temperature sensor after shutdown.

[0031] According to one embodiment of this application, the value of the first time interval is between 1 minute and 5 minutes, and the value of the second time interval is between 1 minute and 5 minutes.

[0032] According to one embodiment of this application, determining the compressor's operating frequency during the first period before the compressor switches from the start-up phase to the shutdown phase includes:

[0033] During the period from receiving a shutdown command to the compressor executing stop control, the compressor's operating frequency is determined.

[0034] After the compressor enters the shutdown phase and a second period has elapsed, determine the outdoor ambient temperature sensor's detected value after shutdown, including:

[0035] After the compressor enters the shutdown phase and the outdoor fan stops performing waste heat control, determine the outdoor ambient temperature sensor's detected value after shutdown.

[0036] Secondly, this application provides an air conditioner, which includes:

[0037] The compressor, outdoor heat exchanger, and indoor heat exchanger are connected in a loop.

[0038] An outdoor ambient temperature sensor is integrated with the outdoor heat exchanger inside the outdoor unit;

[0039] An indoor ambient temperature sensor is integrated with the indoor heat exchanger inside the indoor unit;

[0040] An outdoor fan, which is installed in conjunction with an outdoor heat exchanger, is used to provide airflow to the outdoor heat exchanger.

[0041] An indoor fan, corresponding to the indoor heat exchanger, is used to provide airflow to the indoor heat exchanger;

[0042] The controller is connected to the compressor and an outdoor ambient temperature sensor and is configured to implement the control method described above.

[0043] According to the control method and air conditioner of this application, by recording the operating frequency of the compressor before shutdown and the outdoor ambient temperature sensor detection values ​​before and after shutdown, the degree of heat radiation received by the outdoor ambient temperature sensor under different operating frequencies of the compressor is determined. Then, the current detection value of the outdoor ambient temperature sensor is corrected according to the current operating frequency of the compressor to obtain a more accurate outdoor temperature and improve the control accuracy of the air conditioner.

[0044] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0045] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0046] Figure 1 This is one of the flowcharts illustrating the control method for an air conditioner provided in this application embodiment;

[0047] Figure 2 This is a second schematic flowchart of the air conditioner control method provided in the embodiments of this application. Detailed Implementation

[0048] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0049] In the description, the terms "first," "second," etc., are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such numerical descriptors can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0050] Furthermore, the use of terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] As an example, an air conditioner may include a compressor, an outdoor heat exchanger, an indoor heat exchanger, an outdoor fan, an indoor fan, a controller, an indoor ambient temperature sensor, an outdoor ambient temperature sensor, an outdoor fan driver, an indoor fan driver, a four-way valve, an outdoor electronic expansion valve, and various other valves, as well as an input section. The compressor, outdoor heat exchanger, and indoor heat exchanger form a circulation loop to circulate the heat exchange medium. The circulation loop is equipped with various valves, such as a four-way valve and an outdoor electronic expansion valve, to control the flow direction of the heat exchange medium.

[0052] The controller is connected to the compressor, indoor ambient temperature sensor, outdoor ambient temperature sensor, outdoor fan driver, indoor fan driver, four-way valve and outdoor electronic expansion valve, etc., to control the operation of the corresponding devices or receive feedback information from the corresponding devices.

[0053] Air conditioners typically consist of an indoor unit and an outdoor unit. The compressor, outdoor heat exchanger, outdoor fan, controller, outdoor ambient temperature sensor, and outdoor fan driver are integrated into the outdoor unit; the indoor heat exchanger, indoor fan, indoor ambient temperature sensor, and indoor fan driver are integrated into the indoor unit. Due to size limitations of the outdoor unit, the installation location of the outdoor ambient temperature sensor is restricted and easily affected by heat radiation from the outdoor heat exchanger. Even for ease of installation, the outdoor ambient temperature sensor can be fixed to the surface of the outdoor heat exchanger using structural components.

[0054] When the air conditioner is not running, the surface temperature of the outdoor heat exchanger is the same as the outdoor ambient temperature, and the ambient temperature detected by the outdoor ambient temperature sensor is accurate. Outdoor heat exchanger surface temperature Ty = Outdoor ambient temperature Tx = Current outdoor ambient temperature reading Tz.

[0055] When the air conditioner is running in cooling mode, the high-temperature and high-pressure gas discharged by the compressor goes through the four-way reversing valve to the outdoor heat exchanger. The high-temperature and high-pressure gas exchanges heat with the outdoor air through the outdoor heat exchanger and becomes a high-pressure and medium-temperature liquid, which then flows according to the cooling mode circulation diagram.

[0056] At this time, since the outdoor heat exchanger surface temperature Ty > the outdoor ambient temperature Tx, the outdoor ambient temperature sensor will be affected by the thermal radiation of the outdoor heat exchanger surface temperature, resulting in the outdoor heat exchanger surface temperature Ty ≥ the current outdoor ambient temperature detection value Tz ≥ the outdoor ambient temperature Tx.

[0057] When the air conditioner is operating in heating mode, the high-temperature and high-pressure gas discharged by the compressor passes through the four-way reversing valve to the indoor heat exchanger. The high-temperature and high-pressure gas exchanges heat with the indoor air through the indoor heat exchanger and becomes a high-pressure and medium-temperature liquid. Then, it passes through the expansion valve to throttle into a low-temperature and low-pressure liquid. It then exchanges heat with the outdoor air through the outdoor heat exchanger and becomes a low-temperature and low-pressure gas. The gas then flows according to the heating cycle diagram.

[0058] At this time, since the outdoor heat exchanger surface temperature Ty < outdoor ambient temperature Tx, the outdoor ambient temperature sensor will be affected by the thermal radiation of the outdoor heat exchanger surface temperature, resulting in the outdoor heat exchanger surface temperature Ty ≤ the current outdoor ambient temperature detection value Tz ≤ outdoor ambient temperature Tx.

[0059] Therefore, the outdoor ambient temperature sensor readings are prone to deviation due to the thermal radiation from the outdoor heat exchanger. In related technologies, the temperature detected by the outdoor ambient temperature sensor is typically used directly as the air conditioner's operating control parameter; however, this method easily leads to inaccurate data.

[0060] To address the aforementioned issues, this application proposes a control method and an air conditioner. By recording the operating frequency of the compressor before shutdown and the outdoor ambient temperature sensor readings before and after shutdown, the method determines the degree of thermal radiation received by the outdoor ambient temperature sensor at different operating frequencies of the compressor. Furthermore, it corrects the current readings of the outdoor ambient temperature sensor based on the compressor's current operating frequency to obtain a more accurate outdoor temperature and improve the control precision of the air conditioner.

[0061] Reference Figure 1 , Figure 1An air conditioner control flow is illustrated, and one embodiment of this application proposes an air conditioner control method. The specific structure of the air conditioner can be referred to the foregoing, and will not be repeated here. The control method includes steps 10, 20, 30, 40, and 50.

[0062] Step 10: Obtain the current operating frequency of the compressor during the current startup and operation phase, and the current outdoor ambient temperature detection value of the outdoor ambient temperature sensor during the current startup and operation phase;

[0063] Step 20: Determine the compressor's historical operating frequency during the historical start-up phase within the historical start-up cycle prior to the current start-up phase, as well as the outdoor temperature sensor's historical outdoor temperature readings before and after shutdown during the historical start-up phase.

[0064] Step 30: Determine the correction coefficient based on the historical operating frequency, the historical outdoor temperature detection value before shutdown, and the historical outdoor temperature detection value after shutdown. The correction coefficient reflects the mapping relationship between the compressor's operating frequency and the outdoor ambient temperature deviation value. The outdoor ambient temperature deviation value is equal to the difference between the historical outdoor temperature detection value before shutdown and the historical outdoor temperature detection value after shutdown within the same start-stop cycle.

[0065] Step 40: Correct the current outdoor ambient temperature detection value according to the correction factor and the current operating frequency to obtain the outdoor ambient temperature;

[0066] Step 50: Control the air conditioner according to the outdoor ambient temperature.

[0067] It should be noted that the execution subject of the control method in this embodiment can be a controller, or other devices. The control method provided in this embodiment will be described below using a controller as the execution subject.

[0068] The current operating frequency and the current outdoor ambient temperature can be acquired at the same time, thereby establishing a correlation between the current operating frequency and the outdoor temperature before the current shutdown, which facilitates subsequent correction of the outdoor temperature before the current shutdown based on the current operating frequency.

[0069] It is understandable that, since the outdoor temperature after a historical shutdown can actually represent the actual outdoor ambient temperature within the corresponding historical start-stop cycle, the difference between the outdoor temperature after a historical shutdown and the outdoor temperature before a historical shutdown is equivalent to the thermal radiation from the outdoor heat exchanger, i.e., caused by the compressor's operation. Therefore, a correction factor can be determined by using the compressor's historical operating frequency and this difference.

[0070] During air conditioner operation, the compressor undergoes multiple start-stop cycles. For example, when the indoor ambient temperature has not reached the target temperature, the controller starts the compressor to regulate the indoor temperature to the target temperature; at this time, the compressor is in the start-up phase. Subsequently, when the indoor ambient temperature reaches the target temperature, the controller can stop the compressor to avoid excessive cooling or heating of the indoor environment and to reduce energy consumption; at this time, the compressor transitions from the start-up phase to the shutdown phase. Then, during the compressor shutdown period, if the indoor ambient temperature deviates from the target temperature by a certain threshold, the controller restarts the compressor to readjust the indoor temperature back to the target temperature, and this cycle repeats.

[0071] As an example, after the air conditioner is powered on, starting from the first start-stop cycle of the compressor and in each subsequent start-stop cycle, the operating frequency of the compressor and the corresponding outdoor ambient temperature sensor are recorded.

[0072] It should be noted that during the start-up and operation phase, the recording time for the compressor's operating frequency is the same as the recording time for the outdoor ambient temperature sensor's reading of the outdoor temperature before shutdown. This establishes a correlation between the compressor's operating frequency and the outdoor temperature reading before shutdown.

[0073] In some embodiments, the process of determining the compressor's operating frequency during the start-up phase, and the outdoor temperature sensor's pre-shutdown outdoor temperature readings during the start-up phase and post-shutdown outdoor temperature readings during the shutdown phase, may include:

[0074] Determine the operating frequency of the compressor during the first time before it enters the shutdown phase from the start-up phase, as well as the outdoor temperature sensor readings before shutdown during the first time and after shutdown during the second time after the compressor enters the shutdown phase.

[0075] In this embodiment, the outdoor temperature reading is recorded after a period of time following the compressor's shutdown. This period allows the outdoor heat exchanger's temperature to return to normal, thus recording the outdoor temperature reading after shutdown without the outdoor temperature sensor being exposed to heat radiation.

[0076] The compressor operating frequency during the start-up phase and the outdoor temperature readings before shutdown are recorded close to the shutdown period. This ensures that the acquisition times of the two sets of data before and after shutdown within the same start-up / shutdown cycle are similar, avoiding deviations caused by changes in the outdoor environment itself.

[0077] As an example, the first time interval ranges from 1 minute to 5 minutes, and the second time interval ranges from 1 minute to 5 minutes. Specific values ​​can be set according to requirements, and this implementation does not impose any limitations on them.

[0078] In some embodiments, the first time is the time from when the air conditioner receives the shutdown command to when the compressor stops; the second time is the time after the compressor stops, during which the outdoor fan blows away the residual heat from the outdoor heat exchanger.

[0079] Understandably, after receiving a stop command, the air conditioner controller responds by controlling the compressor to stop. After the compressor stops, its operating frequency gradually decreases. Therefore, the compressor's operating frequency during the time between receiving the stop command and the compressor stopping is the last operating frequency in the current start-stop cycle, thus providing the operating frequency closest to the stop time.

[0080] In this embodiment, after the compressor stops, the outdoor fan can blow air onto the outdoor heat exchanger to dissipate excess heat or cold, making its surface temperature equal to the actual outdoor ambient temperature. Therefore, recording the outdoor temperature reading after shutdown after the outdoor heat exchanger has dissipated residual heat ensures that the outdoor temperature reading after shutdown is equal to the actual outdoor ambient temperature.

[0081] It is understandable that the compressor's operating frequency typically needs to be adjusted in real time during each startup and operation phase, and this adjustment requires the outdoor ambient temperature as a reference. In this embodiment, the outdoor ambient temperature refers to the corrected value after correcting the outdoor temperature detection value fed back by the outdoor ambient temperature sensor.

[0082] In some embodiments, a correction coefficient can be determined by fitting the historical operating frequency, historical outdoor temperature readings before and after shutdown within multiple historical start-stop cycles. After each start-stop cycle, the operating frequency, outdoor temperature readings before and after shutdown within that cycle are added to the fitting, thereby improving the accuracy of the correction coefficient.

[0083] In other embodiments, the historical start-stop cycle includes a first start-stop cycle and a second start-stop cycle, and the correction factor includes a first correction factor, which is determined according to the following formula:

[0084] A1 = |(T1a-T1b)-(T2a-T2b)| ÷ |Y1-Y2|

[0085] Wherein, A1 is the first correction coefficient, T1a is the historical outdoor temperature detection value before shutdown in the first start-stop cycle, T1b is the historical outdoor temperature detection value after shutdown in the first start-stop cycle, T2a is the historical outdoor temperature detection value before shutdown in the second start-stop cycle, T2b is the historical outdoor temperature detection value after shutdown in the second start-stop cycle, Y1 is the historical operating frequency in the first start-stop cycle, and Y2 is the historical operating frequency in the second start-stop cycle.

[0086] T1a-T1b represents the first difference between the outdoor temperature readings before and after shutdown within the first start-stop cycle; T2a-T2b represents the second difference between the outdoor temperature readings before and after shutdown within the second start-stop cycle; and Y1-Y2 represents the third difference between the historical operating frequency within the first start-stop cycle and the historical operating frequency within the second start-stop cycle. The first correction factor is the ratio between the fourth difference (between the first and second differences) and the third difference.

[0087] In this embodiment, the correction coefficient is calculated using two start-stop cycles. Compared with the method of directly fitting multiple start-stop cycles, the computational load is smaller and the impact on the controller's operating load is minimal.

[0088] In other embodiments, multiple start-stop cycles can be divided into multiple groups in pairs, and then the average value of the correction coefficients calculated for each group is taken as the final correction coefficient to correct the current outdoor ambient temperature detection value.

[0089] In some embodiments, there are two historical start-stop cycles: the first start-stop cycle is the previous historical start-stop cycle adjacent to the current start-up phase, and the second start-stop cycle is the previous historical start-stop cycle adjacent to the first start-stop cycle.

[0090] Understandably, with the surface temperature of the outdoor heat exchanger remaining constant, variations in the outdoor temperature will cause different deviations in the outdoor temperature sensor's readings. For example, if the surface temperature of the outdoor heat exchanger is 40°C, and the outdoor temperature is 10°C, the outdoor temperature sensor's reading might be 20°C, resulting in a deviation of 10°C; if the outdoor temperature is 17°C, the sensor's reading might be 23°C, resulting in a deviation of 6°C. Therefore, changes in the outdoor temperature itself can introduce errors into the calculation of the correction factor.

[0091] This implementation method uses only the two most recent historical start-stop cycles to calculate the correction coefficient, which can avoid the possibility that earlier historical start-stop cycles may have undergone significant changes in the outdoor environment, thus causing deviations in the calculation of the correction coefficient; it can also reduce the amount of computation.

[0092] In some embodiments, the correction factor is reset to zero when the air conditioner is powered on again or the operating mode is changed.

[0093] It is understandable that the air conditioner being powered on again or changing its operating mode usually means that the outdoor environment may have changed; or the different operating mode may also cause the relationship between the outdoor heat exchanger and the outdoor ambient temperature to change. Therefore, in order to ensure the accuracy of the correction coefficient, it is necessary to reset and recalculate.

[0094] In some embodiments, the correction factor is zero during the first start-stop cycle and the second start-stop cycle after the air conditioner is first powered on or the correction factor is reset to zero.

[0095] In this embodiment, when the correction coefficient is first calculated, the outdoor temperature sensor's detection value is not corrected during the first and second start-stop cycles. This is to avoid causing larger errors due to insufficient sample size.

[0096] Of course, in other embodiments, the correction factor for the second start-stop cycle can be the ratio between the difference in outdoor temperature readings before and after shutdown in the first start-stop cycle and the operating frequency of the compressor before shutdown.

[0097] In some embodiments, the outdoor ambient temperature is obtained by correcting the current outdoor ambient temperature detection value according to a correction factor and the current operating frequency, including:

[0098] When the air conditioner is in cooling mode, the outdoor ambient temperature is determined based on the following formula:

[0099] Tx = Tz - A × Y;

[0100] When the air conditioner is in heating mode, the outdoor ambient temperature is determined based on the following formula:

[0101] Tx = Tz + A × Y;

[0102] Where Tx is the outdoor ambient temperature, Tz is the current outdoor ambient temperature detection value, A is the correction coefficient, and Y is the current operating frequency.

[0103] When an air conditioner is in cooling mode, the outdoor ambient temperature sensor reading is usually higher than the actual outdoor ambient temperature, so the reading needs to be corrected to be lower. Conversely, when an air conditioner is in cooling mode, the outdoor ambient temperature sensor reading is usually lower than the actual outdoor ambient temperature, so the reading needs to be corrected to be higher.

[0104] In step 50, the controller can control the compressor, outdoor fan, indoor fan, four-way valve or outdoor electronic expansion valve in the air conditioner based on the outdoor ambient temperature to achieve the corresponding control purpose.

[0105] As an example, the controller can determine the operating parameters of each component based on the target indoor and outdoor ambient temperatures. The target indoor ambient temperature can be specified by the user; it refers to the temperature the air conditioner needs to adjust the indoor environment to achieve. Alternatively, it can be controlled in conjunction with the indoor ambient temperature. The difference between the indoor ambient temperature and the target indoor ambient temperature determines whether the air conditioner operates in heating or cooling mode. The greater the difference between the outdoor and indoor ambient temperatures, the higher the compressor's operating frequency.

[0106] Reference Figure 2 , Figure 2 A control flow is shown. As an example, the air conditioner is operating in cooling mode. Step 101: At the beginning, the air conditioner is powered on, but the compressor is not started. The outdoor ambient temperature Tx = the current outdoor ambient temperature detection value Tz - A1 × the current operating frequency Y. At this time, the correction coefficient A0 = 0, that is, the outdoor ambient temperature Tx = the current outdoor ambient temperature detection value Tz.

[0107] Step 102: The air conditioner starts running. During the first start-up and shutdown phases of the compressor, since there is no preceding start-stop cycle, the correction factor A1 is set to 0, i.e., the outdoor ambient temperature Tx = the current outdoor ambient temperature detection value Tz. Furthermore, the outdoor ambient temperature detection value T1a is determined in the first time before the compressor's first shutdown, the compressor's operating frequency Y1 is determined, and the outdoor ambient temperature detection value T1b is determined after the compressor's first shutdown and the second time elapsed.

[0108] Step 103: The air conditioner continues to run. In step 13, during the second start-up and shutdown phases of the compressor, the correction factor A2 remains set to 0, i.e., the outdoor ambient temperature Tx = the current outdoor ambient temperature detection value Tz. Furthermore, determine the outdoor ambient temperature detection value T2a in the first time before the compressor's second shutdown, the compressor's operating frequency Y2, and the outdoor ambient temperature detection value T2b after the compressor's second shutdown and the second time elapsed.

[0109] Step 104: The air conditioner continues to run. During the third start-up and operation phase of the compressor, the correction coefficient A3 is determined according to the following formula: A3 = |(T1a-T1b)-(T2a-T2b)| ÷ |Y1-Y2|, where the outdoor ambient temperature Tx = current outdoor ambient temperature reading Tz - A3 × current operating frequency Y. During the third compressor shutdown, the correction coefficient A3 is changed to 0, i.e., the outdoor ambient temperature Tx = current outdoor ambient temperature reading Tz. Furthermore, the outdoor ambient temperature reading T3a, the compressor operating frequency Y3, and the outdoor ambient temperature reading T3b after the third compressor shutdown and the second time interval are determined.

[0110] Step 105: The air conditioner continues to run. During the fourth start-up and operation phase of the compressor, the correction factor A4 is determined according to the following formula: A4 = |(T2a-T2b)-(T3a-T3b)| ÷ |Y2-Y3|. The outdoor ambient temperature Tx = current outdoor ambient temperature reading Tz - A4 × current operating frequency Y. During the fourth compressor shutdown, the correction factor A4 is changed to 0, i.e., the outdoor ambient temperature Tx = current outdoor ambient temperature reading Tz. Furthermore, the outdoor ambient temperature reading T4a in the first time period before the fourth compressor shutdown, the compressor operating frequency Y4, and the outdoor ambient temperature reading T4b after the fourth compressor shutdown and the second time period are determined.

[0111] Step 1NN: Afterwards, the air conditioner continues to run. During the Nth start-up and operation phase of the compressor, the correction coefficient AN is determined according to the following formula: AN = |(T(N-2)aT(N-2)b)-(T(N-1)aT(N-1)b)| ÷ |Y(N-2)-Y(N-1)|, where the outdoor ambient temperature Tx = current outdoor ambient temperature detection value Tz - AN × current operating frequency Y. During the Nth compressor shutdown, the correction coefficient AN changes to 0, i.e., the outdoor ambient temperature Tx = current outdoor ambient temperature detection value Tz. Furthermore, the outdoor ambient temperature detection value TNa, the compressor operating frequency YN, and the outdoor ambient temperature detection value TNb after the fourth compressor shutdown and the second time interval are determined.

[0112] Step 200: In addition, during the operation of the air conditioner, when it is powered on again or the mode is changed (such as switching from cooling to heating or from heating to cooling), the correction coefficient is reset, and the above sequence is repeated starting from step 102, the first start of the compressor and the first stop of the compressor.

[0113] One embodiment of this application also provides an air conditioner, comprising: a compressor, an outdoor heat exchanger, and an indoor heat exchanger connected in a loop; an outdoor ambient temperature sensor integrated with the outdoor heat exchanger in the outdoor unit; an indoor ambient temperature sensor integrated with the indoor heat exchanger in the indoor unit; an outdoor fan corresponding to the outdoor heat exchanger for providing airflow to the outdoor heat exchanger; an indoor fan corresponding to the indoor heat exchanger for providing airflow to the indoor heat exchanger; and a controller connected to the compressor and the outdoor ambient temperature sensor, configured to implement the control method described above.

[0114] The specific process and principle of the control method can be referred to above. The control method implemented by the controller can be the control method mentioned in the above embodiments, which also has the corresponding technical effects, and will not be repeated here.

[0115] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0116] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes: The compressor, outdoor heat exchanger, and indoor heat exchanger are connected in a loop. An outdoor ambient temperature sensor is integrated with the outdoor heat exchanger inside the outdoor unit; An outdoor fan is provided in correspondence with the outdoor heat exchanger to provide airflow to the outdoor heat exchanger. The compressor includes multiple start-stop cycles during operation, and each start-stop cycle includes a start-up phase and a subsequent shutdown phase. The control method includes: The current operating frequency of the compressor during the current startup and operation phase is obtained, as well as the current outdoor ambient temperature detection value of the outdoor ambient temperature sensor during the current startup and operation phase. Determine the historical operating frequency of the compressor during the historical start-up phase within the historical start-up cycle prior to the current start-up phase, and the outdoor ambient temperature sensor's outdoor temperature detection values ​​before and after the historical shutdown during the historical start-up phase. A correction coefficient is determined based on the historical operating frequency, the historical outdoor temperature detection value before shutdown, and the historical outdoor temperature detection value after shutdown. The correction coefficient reflects the mapping relationship between the operating frequency of the compressor and the outdoor ambient temperature deviation value. The outdoor ambient temperature deviation value is equal to the difference between the historical outdoor temperature detection value before shutdown and the historical outdoor temperature detection value after shutdown within the same start-stop cycle. The current outdoor ambient temperature is corrected based on the correction coefficient and the current operating frequency to obtain the outdoor ambient temperature. The air conditioner is controlled according to the outdoor ambient temperature.

2. The control method according to claim 1, characterized in that, The historical start-stop cycle includes a first start-stop cycle and a second start-stop cycle, and the correction factor includes a first correction factor, which is determined according to the following formula: A1 = |(T1a-T1b)-(T2a-T2b)| ÷ |Y1-Y2| Wherein, A1 is the first correction coefficient, T1a is the historical outdoor temperature detection value before shutdown within the first start-stop cycle, T1b is the historical outdoor temperature detection value after shutdown within the first start-stop cycle, T2a is the historical outdoor temperature detection value before shutdown within the second start-stop cycle, T2b is the historical outdoor temperature detection value after shutdown within the second start-stop cycle, Y1 is the historical operating frequency within the first start-stop cycle, and Y2 is the historical operating frequency within the second start-stop cycle.

3. The control method according to claim 2, characterized in that, The step of correcting the current outdoor ambient temperature detection value according to the correction coefficient and the current operating frequency to obtain the outdoor ambient temperature includes: When the air conditioner is in cooling mode, the outdoor ambient temperature is determined based on the following formula: Tx = Tz - A × Y; When the air conditioner is in heating mode, the outdoor ambient temperature is determined based on the following formula: Tx = Tz + A × Y; Where Tx is the outdoor ambient temperature, Tz is the current outdoor ambient temperature detection value, A is the correction coefficient, and Y is the current operating frequency.

4. The control method according to claim 2, characterized in that, The number of historical start-stop cycles is two. The first start-stop cycle is the previous historical start-stop cycle adjacent to the current start-up and operation phase, and the second start-stop cycle is the previous historical start-stop cycle adjacent to the first start-stop cycle.

5. The control method according to claim 2, characterized in that, When the air conditioner is powered on again or its operating mode is changed, the correction coefficient is reset to zero.

6. The control method according to claim 5, characterized in that, The correction coefficient is zero during the first start-stop cycle and the second start-stop cycle after the air conditioner is first powered on or after the correction coefficient is reset to zero.

7. The control method according to any one of claims 1-6, characterized in that, The control method further includes: The operating frequency of the compressor is determined during the first time period before the compressor switches from the start-up phase to the shutdown phase; Within the first time period, determine the outdoor temperature detection value of the outdoor ambient temperature sensor before shutdown; After the compressor enters the shutdown phase and a second period of time has elapsed, the outdoor ambient temperature sensor detects the outdoor temperature value after shutdown.

8. The control method according to claim 7, characterized in that, The first time interval is between 1 minute and 5 minutes, and the second time interval is between 1 minute and 5 minutes.

9. The control method according to claim 7, characterized in that, Determining the operating frequency of the compressor during the first time period before the compressor switches from the start-up phase to the shutdown phase includes: During the period from receiving a shutdown command to the compressor executing stop control, the operating frequency of the compressor is determined. The step of determining the outdoor temperature detection value of the outdoor ambient temperature sensor after the compressor enters the shutdown phase and after a second period of time includes: After the compressor enters the shutdown phase and the outdoor fan stops performing waste heat control, the outdoor ambient temperature sensor determines the outdoor temperature detection value after shutdown.

10. An air conditioner, characterized in that, The air conditioner includes: The compressor, outdoor heat exchanger, and indoor heat exchanger are connected in a loop. An outdoor ambient temperature sensor is integrated with the outdoor heat exchanger inside the outdoor unit; An indoor ambient temperature sensor is integrated with the indoor heat exchanger inside the indoor unit; An outdoor fan is provided in correspondence with the outdoor heat exchanger to provide airflow to the outdoor heat exchanger. An indoor fan is provided in correspondence with the indoor heat exchanger to provide airflow to the indoor heat exchanger; A controller, connected to the compressor and the outdoor ambient temperature sensor, is configured to implement the control method according to any one of claims 1-9.

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