Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium. The method comprises the steps that the air conditioner is controlled to operate in a heating mode; when the air conditioner meets the preset defrosting condition, the air conditioner is controlled to operate in a preset defrosting mode so as to defrost an outdoor heat exchanger of the air conditioner, and a motor in a compressor of the air conditioner is controlled to operate so as to improve the heating power consumed by the motor; wherein an indoor heat exchanger of the air conditioner in the heating mode and the preset defrosting mode is in a heating state. The method aims at improving the defrosting effect of the outdoor heat exchanger in the heating and defrosting mode process.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method for an air conditioner, an air conditioner, and a storage medium. Background Art

[0002] During the heating operation of an air conditioner, when the outdoor heat exchanger frosts, it generally needs to switch to the defrosting mode to defrost the outdoor heat exchanger. Currently, the air conditioner can use a non-reversing defrosting mode to defrost the outdoor heat exchanger. However, in the non-reversing defrosting mode, the indoor heat exchanger of the air conditioner maintains the heating state during the defrosting process, which will result in very little heat provided for defrosting the outdoor heat exchanger, and the defrosting effect of the outdoor heat exchanger is not good. Summary of the Invention

[0003] The main object of the present invention is to provide a control method for an air conditioner, an air conditioner, and a storage medium, aiming to improve the defrosting effect of the outdoor heat exchanger during the heating defrosting mode.

[0004] To achieve the above object, the present invention provides a control method for an air conditioner, and the control method for the air conditioner includes the following steps:

[0005] Control the air conditioner to operate in the heating mode;

[0006] When the air conditioner meets the preset defrosting condition, control the air conditioner to operate in the preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner, and control the motor in the compressor of the air conditioner to operate to increase the heating power of the motor loss;

[0007] Wherein, in both the heating mode and the preset defrosting mode, the indoor heat exchanger of the air conditioner is in the heating state.

[0008] Optionally, the step of controlling the motor in the compressor of the air conditioner to operate to increase the heating power of the motor loss includes:

[0009] Increase the current amplitude and / or current frequency of the motor.

[0010] Optionally, before the step of increasing the current amplitude of the motor, it further includes:

[0011] Obtain the first maximum temperature allowed by the power device in the motor and the second maximum temperature allowed by the magnet in the motor to maintain magnetism;

[0012] Determine the maximum current amplitude of the motor according to the first maximum temperature and the second maximum temperature;

[0013] The step of increasing the current amplitude of the motor includes:

[0014] Increase the current amplitude of the motor according to the maximum current amplitude.

[0015] Optionally, the step of increasing the current frequency of the motor includes:

[0016] Input a high-frequency voltage to the motor.

[0017] Optionally, the step of inputting a high-frequency voltage to the motor includes;

[0018] When the preset defrosting mode is the first defrosting mode, input a first high-frequency voltage to the motor;

[0019] When the preset defrosting mode is the second defrosting mode, input a second high-frequency voltage to the motor;

[0020] Wherein, the preset defrosting duration corresponding to the first defrosting mode is less than the preset defrosting duration corresponding to the second defrosting mode, and the voltage frequency amplitude of the first high-frequency voltage is greater than the voltage frequency amplitude of the second high-frequency voltage.

[0021] Optionally, before the step of inputting a high-frequency voltage to the motor, further includes:

[0022] Obtain the defrosting frequency of the compressor in the preset defrosting mode;

[0023] Determine the carrier frequency according to the defrosting frequency;

[0024] Determine the target frequency of the high-frequency voltage according to the carrier frequency;

[0025] The step of inputting a high-frequency voltage to the motor includes:

[0026] Input a high-frequency voltage to the motor according to the target frequency.

[0027] Optionally, after the step of inputting a high-frequency voltage to the motor, further includes:

[0028] Obtain the exhaust temperature of the compressor;

[0029] Adjust the high-frequency voltage input to the motor according to the exhaust temperature.

[0030] Optionally, the air conditioner further includes a commutation component and an electronic expansion valve. The indoor heat exchanger, the electronic expansion valve, and the outdoor heat exchanger are connected in sequence. The indoor heat exchanger, the outdoor heat exchanger, and the compressor are all connected to the commutation component. When the air conditioner meets the preset defrosting condition, the step of controlling the air conditioner to operate in the preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner includes:

[0031] When the air conditioner meets the preset defrosting condition, control the reversing component to operate in the current state, control the electronic expansion valve to increase the opening degree, and control the compressor to operate at the defrosting frequency.

[0032] Optionally, the preset defrosting condition includes a first defrosting condition or a second defrosting condition. The first defrosting condition indicates that the frosting thickness of the outdoor heat exchanger is less than that when the air conditioner meets the preset defrosting condition. The steps of controlling the reversing component to operate in the current state, controlling the electronic expansion valve to increase the opening degree, and controlling the compressor to operate at the defrosting frequency include:

[0033] When the air conditioner meets the first defrosting condition, control the reversing component to operate in the current state, control the electronic expansion valve to increase to the first opening degree, and control the compressor to operate at the first defrosting frequency;

[0034] When the air conditioner meets the second defrosting condition, control the reversing component to operate in the current state, control the electronic expansion valve to increase to the second opening degree, and control the compressor to operate at the second defrosting frequency;

[0035] Wherein, the first opening degree is less than the second opening degree, and the first defrosting frequency is less than the second defrosting frequency.

[0036] In addition, to achieve the above object, the present application also proposes an air conditioner, which includes: a memory, a processor, and a control program of the air conditioner stored on the memory and executable on the processor. When the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner described in any one of the above are implemented.

[0037] In addition, to achieve the above object, the present application also proposes a storage medium, on which a control program of the air conditioner is stored. When the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner described in any one of the above are implemented.

[0038] A control method of an air conditioner proposed by the present invention. When the outdoor heat exchanger needs to be defrosted during the heating process of the air conditioner, during the defrosting process of the outdoor heat exchanger in the preset defrosting mode where the indoor heat exchanger maintains heating, by controlling the operation of the motor in the compressor to increase the heating power of the motor loss of the motor, the exhaust temperature of the compressor can be increased, which is beneficial to providing more heat for defrosting the outdoor heat exchanger, thereby effectively improving the defrosting effect of the outdoor heat exchanger during the heating defrosting mode process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the hardware structure involved in the operation of an embodiment of the air conditioner of the present invention;

[0040] Figure 2 Schematic flow chart of an embodiment of the control method of the air conditioner according to the present invention;

[0041] Figure 3 Schematic flow chart of another embodiment of the control method of the air conditioner according to the present invention;

[0042] Figure 4 Schematic diagram of the variation characteristics of the frequency of the compressor and the d-axis voltage of the motor in the compressor before and after entering the preset defrost mode, which is related to the embodiment of the control method of the air conditioner according to the present invention;

[0043] Figure 5 Schematic diagram of the current variation characteristics before and after entering the preset defrost mode, which is related to the embodiment of the control method of the air conditioner according to the present invention.

[0044] The realization of the object, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] An embodiment of the present invention provides an air conditioner. The air conditioner can include types such as wall-mounted air conditioners, cabinet air conditioners, ceiling-mounted air conditioners, and central air conditioners.

[0047] Referring to Figure 1 , the air conditioner includes a control device 1, a compressor 2, a reversing component 3, an indoor heat exchanger, an electronic expansion valve 4, and an outdoor heat exchanger. The compressor 2, the reversing component 3, and the electronic expansion valve 4 are all connected to the control device 1.

[0048] An indoor fan is correspondingly arranged for the indoor heat exchanger, and an outdoor fan is correspondingly arranged for the outdoor heat exchanger. The indoor fan and the outdoor fan are both connected to the control device 1.

[0049] Among them, the indoor heat exchanger, the electronic expansion valve 4, and the outdoor heat exchanger are connected in sequence. The indoor heat exchanger, the outdoor heat exchanger, the exhaust port of the compressor 2, and the suction port of the compressor 2 are all connected to the reversing component 3.

[0050] The reversing component 3 has a first operating state and a second operating state. When the reversing component 3 is in the first operating state, the exhaust port of the compressor 2 is communicated with the indoor heat exchanger, and the suction port of the compressor 2 is communicated with the outdoor heat exchanger; when the reversing component is in the second operating state, the exhaust port of the compressor 2 is communicated with the outdoor heat exchanger, and the suction port of the compressor 2 is communicated with the indoor heat exchanger.

[0051] Through the cooperation of the reversing component 3 and the electronic expansion valve 4, the operating modes of the air conditioner are at least the following several types:

[0052] Heating mode, the commutation component 3 is in the first operating state, the electronic expansion valve 4 operates with a throttling opening degree. The refrigerant discharged from the compressor 2 sequentially flows through the indoor heat exchanger, the electronic expansion valve 4, and the outdoor heat exchanger and then returns to the compressor 2. The indoor heat exchanger is in a condensing state, and the outdoor heat exchanger is in an evaporating state. The indoor heat exchanger can release heat to the indoor environment to increase the indoor temperature.

[0053] First defrosting mode, the commutation component 3 is in the first operating state, the electronic expansion valve 4 operates with a first opening degree, and the first opening degree is greater than the above-mentioned throttling opening degree. The refrigerant discharged from the compressor 2 sequentially flows through the indoor heat exchanger, the electronic expansion valve 4, and the outdoor heat exchanger and then returns to the compressor 2. The indoor heat exchanger is in a condensing state, and the outdoor heat exchanger is in a heat-releasing state. When the refrigerant flows through the outdoor heat exchanger, it can release heat to melt the frost on the outdoor heat exchanger.

[0054] Second defrosting mode, the commutation component 3 is in the first operating state, the electronic expansion valve 4 operates with a second opening degree, and the second opening degree is greater than the above-mentioned first opening degree. The refrigerant discharged from the compressor 2 sequentially flows through the indoor heat exchanger, the electronic expansion valve 4, and the outdoor heat exchanger and then returns to the compressor 2. The indoor heat exchanger is in a condensing state, and the outdoor heat exchanger is in a heat-releasing state. When the refrigerant flows through the outdoor heat exchanger, it can release heat to melt the frost on the outdoor heat exchanger. The heat release amount of the outdoor heat exchanger in the second defrosting mode is greater than the heat release amount of the outdoor heat exchanger in the first defrosting mode.

[0055] Refrigeration mode or third defrosting mode, the commutation component 3 is in the second operating state, the electronic expansion valve 4 operates with a throttling opening degree. The refrigerant discharged from the compressor 2 sequentially flows through the outdoor heat exchanger, the electronic expansion valve 4, and the indoor heat exchanger and then returns to the compressor 2. The outdoor heat exchanger is in a condensing state, and the indoor heat exchanger is in an evaporating state. In the refrigeration mode, the indoor heat exchanger can release cold to the indoor space to lower the indoor temperature; in the third defrosting mode, the outdoor heat exchanger can release heat to melt the frost on the outdoor heat exchanger. The heat release amount of the outdoor heat exchanger in the third defrosting mode is greater than the heat release amount of the outdoor heat exchanger in the second defrosting mode.

[0056] Furthermore, the compressor 2 includes a housing, a motor, and a compression cylinder. The housing is provided with the above-mentioned exhaust port and suction port. An installation cavity is provided inside the housing. Both the motor and the compression cylinder are installed in the installation cavity. The exhaust port and the air outlet of the compression cylinder are both communicated with the installation cavity, and the suction port is communicated with the air inlet of the compression cylinder. The motor includes a stator and a rotor. The rotor is in transmission connection with the compression cylinder. The stator includes windings, and the windings are installed in the installation cavity and are located outside the compression cylinder.

[0057] In this embodiment, the motor is a three-phase motor.

[0058] In the embodiment of the present invention, refer to Figure 1, the control device 1 of the air conditioner includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicate with each other through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0059] Those skilled in the art can understand that Figure 1 the device structure shown in

[0060] does not constitute a limitation on the device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange different components. Figure 1 As shown in

[0061] In Figure 1 the device shown, the processor 1001 can be used to call the control program of the air conditioner stored in the memory 1002 and execute the relevant step operations of the control method of the air conditioner in the following embodiments.

[0062] The embodiment of the present invention also provides a control method for an air conditioner.

[0063] Referring to Figure 2 , an embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the control method of the air conditioner includes:

[0064] Step S10, controlling the air conditioner to operate in the heating mode;

[0065] In the heating mode, the reversing component is in the first operating state, the electronic expansion valve operates with a throttling opening, the refrigerant discharged by the compressor flows through the indoor heat exchanger, the electronic expansion valve, and the outdoor heat exchanger in sequence and then returns to the compressor. The indoor heat exchanger is in a condensing state, the outdoor heat exchanger is in an evaporating state, and the indoor heat exchanger can release heat to the indoor environment to increase the indoor temperature.

[0066] Step S20, when the air conditioner meets the preset defrosting condition, controlling the air conditioner to operate in a preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner, and controlling the motor in the compressor of the air conditioner to operate to increase the heating power of the motor loss;

[0067] Among them, the indoor heat exchanger of the air conditioner is in a heating state in both the heating mode and the preset defrosting mode.

[0068] The preset defrosting condition can be the condition that the environmental parameters and / or the state parameters of the air conditioner itself need to meet when there is a risk of frosting on the outdoor heat exchanger. In this embodiment, the preset defrosting condition represents the condition that the environmental parameters and / or the state parameters of the air conditioner itself need to meet when there is a risk of frosting on the outdoor heat exchanger and the frost thickness is less than the preset thickness.

[0069] During the operation of the air conditioner in the heating mode, the outdoor environmental parameters and / or the state parameters of the air conditioner itself (such as the temperature parameter of the outdoor heat exchanger, etc.) are detected in real time or at intervals of a set duration. According to the detected parameters, it is determined whether the preset defrosting condition is met.

[0070] When the air conditioner switches from the heating mode to the preset defrosting mode, at least one of the following parameters can be adjusted to make the air conditioner enter the preset defrosting mode: the opening degree of the electronic expansion valve, the compressor frequency, the indoor fan speed, the outdoor fan speed, etc. In this embodiment, the preset defrosting mode can include the above first defrosting mode or the second defrosting mode.

[0071] The motor loss here includes iron loss and / or copper loss. The heating power specifically includes the copper loss heating generated by the motor current in the motor winding due to resistance and / or the iron loss heating generated by the magnetic field in the motor core. The increase in the calorific value of the motor loss can increase the temperature in the installation cavity of the compressor, and the temperature of the gaseous refrigerant discharged from the compression cylinder after flowing through the installation cavity and discharged through the exhaust port can be effectively increased, thereby effectively increasing the exhaust temperature of the compressor.

[0072] The calculation formula for the copper loss heating power of the motor is: P Cu =3I 2 R, and the calculation formula for the iron loss heating power of the motor is: where I and R respectively represent the effective value of the phase current and the phase resistance of the motor, k Fe , respectively represent the iron loss coefficient of the motor, the magnetic field frequency in the motor and the magnetic field intensity corresponding to this frequency, and α and β are empirical correction coefficients. The copper loss power is positively correlated with the motor current and resistance. For a given motor, the resistance is basically unchanged, so the influencing factor is mainly the motor current. The iron loss heating power is positively correlated with the magnetic field frequency and magnetic field intensity. For a permanent magnet synchronous motor, its magnetic field mainly comes from the permanent magnet magnetic field and the magnetic field induced by the current. For a given motor, the permanent magnet magnetic field is basically unchanged, and the magnetic field induced by the current in the motor is: B m =k c NI s λ m , where k c , N, I s , λ mThey are the magnetomotive force coefficient, the number of turns of the motor winding, the amplitude of the motor current, and the magnetic permeability of the motor, respectively. Thus, the heating power of the motor loss can be increased by at least one of the following methods: increasing the amplitude of the motor current, increasing the current frequency of the motor, increasing the magnetic field strength, increasing the voltage frequency of the motor, and so on.

[0073] The electrical energy control parameters (such as current control parameters and / or voltage control parameters, etc.) during the process of increasing the heating power of the motor loss can be preset fixed parameters or parameters determined according to the actual defrosting state of the air conditioner. Among them, different preset defrosting modes can correspond to different electrical energy control parameters.

[0074] It should be noted that in the preset defrosting mode, the compressor maintains operation at the defrosting frequency while increasing the heating power.

[0075] A control method for an air conditioner proposed in an embodiment of the present invention. When the outdoor heat exchanger needs to be defrosted during the heating process of the air conditioner, during the process of defrosting the outdoor heat exchanger in the preset defrosting mode where the indoor heat exchanger maintains heating, the motor in the compressor is controlled to operate to increase the heating power of the motor loss of the motor, so as to increase the exhaust temperature of the compressor, which is beneficial to providing more heat for defrosting the outdoor heat exchanger, thereby effectively improving the defrosting effect of the outdoor heat exchanger during the heating defrosting mode.

[0076] Further, in the above embodiment, the step of controlling the operation of the motor in the compressor of the air conditioner to increase the heating power of the motor loss includes: increasing the amplitude and current frequency of the motor.

[0077] Here, the amplitude of the motor current can be increased according to a preset fixed current adjustment value, or the amplitude adjustment value can be determined according to the current defrosting state parameters of the air conditioner (such as outdoor environmental parameters, temperature parameters of the outdoor heat exchanger, and current defrosting duration, etc.), and the amplitude of the motor current is increased according to the determined amplitude adjustment value.

[0078] Here, the current frequency of the motor can be increased according to a preset fixed frequency adjustment value, or the frequency adjustment value can be determined according to the current defrosting state parameters of the air conditioner (such as outdoor environmental parameters, temperature parameters of the outdoor heat exchanger, and current defrosting duration, etc.), and the current frequency of the motor is increased according to the determined frequency adjustment value.

[0079] In this embodiment, since the increase in the current amplitude is limited, therefore, both the current amplitude and the current frequency are increased, which is beneficial to further increasing the heating power of the motor loss, and can provide more heat for defrosting the outdoor unit during the heating defrosting process, thereby further improving the defrosting effect of the outdoor heat exchanger.

[0080] Further, based on the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed.

[0081] In this embodiment, referring to Figure 3 , before the step of increasing the current amplitude of the motor, the following steps are further included:

[0082] Step S01, obtain the first maximum temperature allowed by the power device in the motor and the second maximum temperature allowed by the magnet in the motor to maintain magnetism;

[0083] The power device (such as a resistor, etc.) will operate normally only within a certain temperature range, and the power device will be damaged when the temperature exceeds this temperature range. The first maximum temperature here is the maximum temperature value of this temperature range.

[0084] The magnet (such as a permanent magnet) will have magnetism only within a certain temperature range, and the magnet will demagnetize when the temperature exceeds this temperature range. The second maximum temperature here is the maximum temperature value of this temperature range.

[0085] Step S02, determine the maximum current amplitude of the motor according to the first maximum temperature and the second maximum temperature;

[0086] The corresponding relationship among the first maximum temperature, the second maximum temperature, and the maximum current amplitude can be preset, and can be a calculation formula, a mapping relationship, etc. Based on this corresponding relationship, the maximum current amplitude corresponding to the current first maximum temperature and the second maximum temperature can be determined.

[0087] In one implementation, the first reference value of the maximum current amplitude can be determined according to the first maximum temperature, the second reference value of the maximum current amplitude can be determined according to the second maximum temperature, and the minimum value of the first reference value and the second reference value is determined as the maximum current amplitude here.

[0088] In another implementation, the first maximum temperature and the second maximum temperature are substituted into a preset formula to calculate the maximum current amplitude.

[0089] Based on Step S01 and Step S02, the step of increasing the current amplitude of the motor includes:

[0090] Step S201, increase the current amplitude of the motor according to the maximum current amplitude.

[0091] In one implementation, the current amplitude of the motor can be increased to the maximum current amplitude to achieve the maximum heat generation.

[0092] In another implementation, after the current amplitude is increased, the target amplitude can be a preset fixed value or a value determined according to the actual defrosting state of the air conditioner. When the target amplitude is less than the maximum current amplitude, the current amplitude of the motor is increased to the target amplitude; when the target amplitude is greater than or equal to the maximum current amplitude, the current amplitude of the motor is increased to the maximum current amplitude.

[0093] In this embodiment, it is beneficial to ensure that the heating power is increased to improve the defrosting effect while protecting the normal and stable operation of the power device and the motor magnet.

[0094] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the step of increasing the current frequency of the motor includes: inputting a high-frequency voltage to the motor.

[0095] The voltage control parameter of the high-frequency voltage can be a preset fixed parameter or a parameter determined according to the actual defrosting state parameters of the air conditioner.

[0096] The voltage here is specifically the d-axis voltage of the motor.

[0097] In this embodiment, as Figure 4 shown, a high-frequency square wave voltage can be input to the motor. Further, as Figure 5 shown, they are respectively the motor current change curve during the heating mode operation before entering the preset defrosting mode ( Figure 5 (a)) and the motor current change curve during the process of inputting the high-frequency voltage in the preset defrosting mode Figure 5 (b). In the preset defrosting mode, a fixed voltage is maintained to be input to the motor. Inputting the high-frequency voltage to the motor in the preset defrosting mode can cause the motor to generate high-frequency harmonic current, and the high-frequency harmonic current can greatly increase the iron loss heating power while increasing the copper loss heating power of the motor.

[0098] In this embodiment, the heating power of the motor loss is effectively increased by the input of the high-frequency voltage. Especially when there is a limit to the increase in the current amplitude, the input of the high-frequency voltage can further increase the exhaust temperature, thereby further improving the defrosting effect of the outdoor heat exchanger.

[0099] In other embodiments, the step of increasing the current frequency of the motor can also include inputting high-frequency harmonic current to the motor.

[0100] Further, in this embodiment, the step of inputting the high-frequency voltage to the motor includes;

[0101] When the preset defrosting mode is the first defrosting mode, input a first high-frequency voltage to the motor;

[0102] When the preset defrosting mode is the second defrosting mode, input a second high-frequency voltage to the motor;

[0103] Wherein, the preset defrosting duration corresponding to the first defrosting mode is less than the preset defrosting duration corresponding to the second defrosting mode, and the voltage frequency amplitude of the first high-frequency voltage is greater than the voltage frequency amplitude of the second high-frequency voltage.

[0104] The frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode.

[0105] The preset defrosting duration is the duration required for the preset defrosting mode to operate as pre-set. When the air conditioner is operating in the first defrosting mode, when the actual defrosting duration reaches the corresponding preset defrosting duration, the air conditioner exits the first defrosting mode and resumes operation in the heating mode; when the air conditioner is operating in the second defrosting mode, when the actual defrosting duration reaches the corresponding preset defrosting duration, the air conditioner exits the second defrosting mode and resumes operation in the heating mode.

[0106] The voltage frequency amplitudes of the first high-frequency voltage and the second high-frequency voltage can be fixed values pre-set, or can be determined according to the actual frosting state of the outdoor unit and / or the preset defrosting mode. In this embodiment, a corresponding relationship between the preset defrosting duration of the preset defrosting mode and the voltage frequency amplitude can be pre-established based on the maximum heating power allowed for the normal operation of the motor. Based on this corresponding relationship, the first target voltage frequency amplitude corresponding to the preset defrosting duration of the first defrosting mode can be determined, and the second target voltage frequency amplitude corresponding to the preset defrosting duration of the second defrosting mode can be determined.

[0107] In this embodiment, by the above method, when the defrosting duration of the first defrosting mode is short, a high-frequency voltage with a high voltage frequency amplitude can be input to the motor, which is beneficial to ensuring that the motor is not damaged while the heating power of the motor in the first defrosting mode is as large as possible. When the defrosting duration of the second defrosting mode is long, a high-frequency voltage with a low voltage frequency amplitude can be input to the motor to prevent the total heating power of the motor from being too large during the entire second defrosting mode process and causing damage to the motor. Based on this, it is ensured that no matter whether the first defrosting mode or the second defrosting mode is used for defrosting, the heat generation can reach the heat required to improve the defrosting effect while protecting the motor.

[0108] In other embodiments, the voltage frequency amplitudes corresponding to different preset defrosting modes can also be the same.

[0109] Further, before the step of inputting the high-frequency voltage to the motor, the method further includes: obtaining the defrosting frequency of the compressor in the preset defrosting mode; determining the carrier frequency according to the defrosting frequency; determining the target frequency of the high-frequency voltage according to the carrier frequency; the step of inputting the high-frequency voltage to the motor includes: inputting the high-frequency voltage to the motor according to the target frequency.

[0110] Different preset defrosting modes correspond to different defrosting frequencies. The preset defrosting mode may include the above-mentioned first defrosting mode or second defrosting mode, and the defrosting frequency corresponding to the first defrosting mode is less than the defrosting frequency corresponding to the second defrosting mode.

[0111] The defrosting frequency and the carrier frequency may be positively correlated. Based on the defrosting frequency, the carrier frequency can be determined by substituting into a preset formula, looking up a table, or other methods.

[0112] After obtaining the carrier frequency, the target frequency here can be obtained by amplifying the carrier frequency by a preset multiple.

[0113] In this embodiment, determining the target frequency in the above manner to control the input of the high-frequency voltage of the motor is beneficial to ensuring that the compressor can maintain operation at the required defrosting frequency during the preset defrosting mode while effectively increasing the heating power of the motor loss, which is beneficial to further improving the defrosting effect.

[0114] In other embodiments, the target frequency may also be a preset fixed frequency.

[0115] Further, after the step of inputting the high-frequency voltage to the motor, the method further includes: obtaining the exhaust temperature of the compressor; adjusting the high-frequency voltage input to the motor according to the exhaust temperature.

[0116] Here, the exhaust temperature is specifically detected by a temperature sensor provided at the exhaust port of the compressor.

[0117] In one implementation, when the exhaust temperature is greater than or equal to the preset protection temperature, the frequency or the amplitude of the voltage frequency of the high-frequency voltage input to the motor can be reduced. When the exhaust temperature is less than the preset protection temperature, the current high-frequency voltage input to the motor can be maintained.

[0118] In another implementation, according to the temperature difference value between the exhaust temperature and the target temperature required for defrosting, the frequency or the amplitude of the voltage frequency of the high-frequency voltage input to the motor can be increased or decreased according to the temperature difference value.

[0119] In this embodiment, adapting to adjust the input high-frequency voltage according to the exhaust temperature is beneficial to improving the defrosting effect and protecting the compressor at the same time.

[0120] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the indoor heat exchanger, the electronic expansion valve, and the outdoor heat exchanger are connected in sequence, and the indoor heat exchanger, the outdoor heat exchanger, and the compressor are all connected to the commutation component. When the air conditioner meets the preset defrosting condition, the steps of controlling the air conditioner to operate in a preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner include:

[0121] When the air conditioner meets the preset defrosting condition, control the commutation component to maintain the current state of operation, control the electronic expansion valve to increase the opening degree, and control the compressor to operate at the defrosting frequency.

[0122] The target opening degree after the increase of the electronic expansion valve can be a preset fixed opening degree (such as the maximum opening degree), or can be an opening degree determined according to the actual frosting state of the air conditioner.

[0123] The defrosting frequency can be a preset fixed frequency, or can be a frequency determined according to the actual frosting state of the air conditioner.

[0124] In this embodiment, when the air conditioner meets the preset defrosting condition, the commutation component does not commutate. By increasing the opening degree of the electronic expansion valve and the compressor operating at the defrosting frequency, it is ensured that the indoor heat exchanger can maintain the heating state during the defrosting process, thereby effectively improving the indoor heating comfort while defrosting.

[0125] Further, in this embodiment, the preset defrosting condition includes a first defrosting condition or a second defrosting condition. The first defrosting condition means that the frosting thickness of the outdoor heat exchanger is less than When the air conditioner meets the preset defrosting condition, the steps of controlling the commutation component to maintain the current state of operation, controlling the electronic expansion valve to increase the opening degree, and controlling the compressor to operate at the defrosting frequency include: when the air conditioner meets the first defrosting condition, control the commutation component to maintain the current state of operation, control the electronic expansion valve to increase to the first opening degree, and control the compressor to operate at the first defrosting frequency; when the air conditioner meets the second defrosting condition, control the commutation component to maintain the current state of operation, control the electronic expansion valve to increase to the second opening degree, and control the compressor to operate at the second defrosting frequency; wherein, the first opening degree is less than the second opening degree, and the first defrosting frequency is less than the second defrosting frequency.

[0126] Combined with Figure 4, define the operating frequency of the compressor during the heating mode operation of the air conditioner as the initial frequency. When the air conditioner meets the first defrosting condition, if the initial frequency is greater than the first defrosting frequency, control the compressor to first decrease to the first set frequency and operate for a preset duration, and then decrease to the first defrosting frequency for operation, where the first set frequency is greater than the first defrosting frequency; if the initial frequency is less than the first defrosting frequency, control the compressor to increase to the first defrosting frequency for operation at a preset rate. When the air conditioner meets the second defrosting condition, if the initial frequency is greater than the second defrosting frequency, control the compressor to first decrease to the second set frequency and operate for a preset duration, and then decrease to the second defrosting frequency for operation, where the second set frequency is greater than the second defrosting frequency and the first set frequency is less than the second set frequency; if the initial frequency is less than the second defrosting frequency, control the compressor to increase to the second defrosting frequency for operation at a preset rate. By this way, it is beneficial to avoid the situation that while the opening degree of the expansion valve increases, the compressor frequency drops too fast, which may cause the compressor exhaust temperature to drop rapidly and affect the non-reversing defrosting effect.

[0127] Furthermore, when the air conditioner meets the first defrosting condition, in addition to controlling the electronic expansion valve and the compressor in the above manner, it is also possible to control the outdoor fan to stop and / or control the indoor fan to decrease to the set speed; when the air conditioner meets the second defrosting condition, in addition to controlling the electronic expansion valve and the compressor in the above manner, it is also possible to control the outdoor fan to stop and / or control the indoor fan to decrease the speed and then turn off.

[0128] In this embodiment, it is possible to adapt to different frosting thicknesses of the outdoor heat exchanger and adopt different defrosting modes for defrosting, thereby further improving the balance between indoor heating comfort and the defrosting effect of the outdoor heat exchanger.

[0129] Furthermore, when the air conditioner also has a third defrosting mode (i.e., the cooling defrosting mode), during the heating mode operation of the air conditioner, first detect whether the operating parameters of the air conditioner itself and / or the environment where the air conditioner is located meet the conditions for entering the cooling defrosting judgment. If it meets the conditions, then judge whether the air conditioner meets the conditions for entering the third defrosting mode. If it meets the conditions for entering the third defrosting mode, control the air conditioner to operate in the third defrosting mode. If it does not meet the conditions for entering the third defrosting mode, control the air conditioner to maintain the heating mode operation; if it does not meet the conditions for entering the cooling defrosting judgment, then judge whether the air conditioner meets the above preset defrosting conditions, and when it meets the preset defrosting conditions, control the air conditioner to operate in the preset defrosting mode; when it does not meet the preset defrosting mode, control the air conditioner to maintain the heating mode operation. Among them, the operation of the air conditioner in the third defrosting mode includes: the compressor is turned off, the commutation component is switched from the first operating state to the second operating state, the compressor is turned on and operates at the defrosting frequency, and so on.

[0130] In this embodiment, through the above method, it can be ensured that the air conditioner can adapt to different frosting thicknesses of the outdoor heat exchanger and select different defrosting modes for defrosting, thereby effectively improving the indoor comfort while ensuring the outdoor defrosting effect.

[0131] In addition, an embodiment of the present invention further provides a storage medium, on which a control program of the air conditioner is stored. When the control program of the air conditioner is executed by a processor, the relevant steps of any one of the above embodiments of the control method of the air conditioner are implemented.

[0132] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or system. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or system including the element.

[0133] The above serial numbers of the embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0134] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

[0135] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A control method for an air conditioner, characterized in that, The control method of the air conditioner includes the following steps: Control the air conditioner to operate in the heating mode; When the air conditioner meets the preset defrosting condition, control the air conditioner to operate in a preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner, and control the motor in the compressor of the air conditioner to operate to increase the heating power of the motor loss; Wherein, the indoor heat exchanger of the air conditioner is in the heating state in both the heating mode and the preset defrosting mode.

2. The control method of the air conditioner according to claim 1, characterized in that, The step of controlling the motor in the compressor of the air conditioner to operate to increase the heating power of the motor loss includes: Increase the current amplitude and / or current frequency of the motor.

3. The control method of the air conditioner according to claim 2, wherein, Before the step of increasing the current amplitude of the motor, it further includes: Obtain the first maximum temperature allowed by the power device in the motor and the second maximum temperature allowed by the magnet in the motor to maintain magnetism; Determine the maximum current amplitude of the motor according to the first maximum temperature and the second maximum temperature; The step of increasing the current amplitude of the motor includes: Increase the current amplitude of the motor according to the maximum current amplitude.

4. The control method of the air conditioner according to claim 2, wherein, The step of increasing the current frequency of the motor includes: Input a high-frequency voltage to the motor.

5. The control method of the air conditioner according to claim 4, characterized in that, The step of inputting a high-frequency voltage to the motor includes; When the preset defrosting mode is the first defrosting mode, input a first high-frequency voltage to the motor; When the preset defrosting mode is the second defrosting mode, input a second high-frequency voltage to the motor; Wherein, the preset defrosting duration corresponding to the first defrosting mode is less than the preset defrosting duration corresponding to the second defrosting mode, and the voltage frequency amplitude of the first high-frequency voltage is greater than the voltage frequency amplitude of the second high-frequency voltage.

6. The control method of the air conditioner according to claim 4, characterized in that, Before the step of inputting a high-frequency voltage to the motor, it further includes: Obtain the defrosting frequency of the compressor in the preset defrosting mode; Determine the carrier frequency according to the defrosting frequency; Determine the target frequency of the high-frequency voltage according to the carrier frequency; The step of inputting a high-frequency voltage to the motor includes: Input a high-frequency voltage to the motor according to the target frequency.

7. The control method of the air conditioner according to claim 4, wherein, After the step of inputting a high-frequency voltage to the motor, it further includes: Obtain the exhaust temperature of the compressor; Adjust the high-frequency voltage input to the motor according to the exhaust temperature.

8. The control method of the air conditioner according to any one of claims 1 to 7, characterized in that The air conditioner further includes a commutation component and an electronic expansion valve. The indoor heat exchanger, the electronic expansion valve, and the outdoor heat exchanger are connected in sequence. The indoor heat exchanger, the outdoor heat exchanger, and the compressor are all connected to the commutation component. The step of controlling the air conditioner to operate in a preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner when the air conditioner meets the preset defrosting condition includes: When the air conditioner meets the preset defrosting condition, control the commutation component to maintain the current state of operation, control the electronic expansion valve to increase the opening degree, and control the compressor to operate at the defrosting frequency.

9. The control method of the air conditioner according to claim 8, wherein, The preset defrosting condition includes a first defrosting condition or a second defrosting condition. When the frost thickness of the outdoor heat exchanger represented by the first defrosting condition is less than that when the air conditioner meets the preset defrosting condition, the steps of controlling the commutation component to maintain the current state of operation, controlling the electronic expansion valve to increase the opening degree, and controlling the compressor to operate at the defrosting frequency include: When the air conditioner meets the first defrosting condition, control the commutation component to maintain the current state of operation, control the electronic expansion valve to increase to a first opening degree, and control the compressor to operate at a first defrosting frequency; When the air conditioner meets the second defrosting condition, control the commutation component to maintain the current state of operation, control the electronic expansion valve to increase to a second opening degree, and control the compressor to operate at a second defrosting frequency; Wherein, the first opening degree is less than the second opening degree, and the first defrosting frequency is less than the second defrosting frequency.

10. An air conditioner, characterized in that, The air conditioner includes: a memory, a processor, and a control program of the air conditioner stored on the memory and executable on the processor. When the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 9 are implemented.

11. A storage medium, characterized in that, A control program of the air conditioner is stored on the storage medium. When the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 9 are implemented.

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