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 increase the heating value of a winding in 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 heat generation of the winding in the motor;

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

[0008] Optionally, the step of controlling the motor in the compressor of the air conditioner to operate to increase the heat generation of the winding in the motor includes:

[0009] Increase the negative d-axis current of the motor.

[0010] Optionally, the step of increasing the negative d-axis current of the motor includes:

[0011] When the preset defrosting mode is the first defrosting mode, increase the negative d-axis current of the motor with a first given value;

[0012] When the preset defrosting mode is the second defrosting mode, increase the negative d-axis current of the motor with a second given value as the target value;

[0013] 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 first given value is greater than the second given value.

[0014] Optionally, before the step of increasing the negative d-axis current of the motor, the method further includes:

[0015] Obtaining the initial frequency of the compressor before the air conditioner satisfies the preset defrosting condition and the defrosting frequency of the compressor in the preset defrosting mode;

[0016] Determining a current adjustment rate according to the relationship value between the initial frequency and the defrosting frequency;

[0017] The step of increasing the negative d-axis current of the motor includes:

[0018] Increasing the negative d-axis current of the motor according to the current adjustment rate.

[0019] Optionally, before the step of 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 heat generation amount of the windings in the motor, the method further includes:

[0020] When the air conditioner satisfies the preset defrosting condition, determining a target current value of the q-axis of the motor according to the defrosting frequency of the compressor in the preset defrosting mode;

[0021] The step of 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 heat generation amount of the windings in the motor includes:

[0022] Adjusting the q-axis current of the motor according to the target current value so that the compressor reaches the defrosting frequency, and increasing the negative d-axis current of the motor.

[0023] Optionally, after the step of increasing the negative d-axis current of the motor, the method further includes:

[0024] When the air conditioner satisfies the defrosting end condition, reducing the negative d-axis current of the motor to the current set value corresponding to the heating mode.

[0025] 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. 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 satisfies the preset defrosting condition includes:

[0026] When the air conditioner satisfies the preset defrosting condition, controlling the commutation 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.

[0027] Optionally, the preset defrosting condition includes a first defrosting condition or a second defrosting condition. The first defrosting condition indicates that the frost thickness on the outdoor heat exchanger is less than that when the air conditioner satisfies the preset defrosting condition, 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 includes the steps of:

[0028] When the air conditioner satisfies the first defrosting condition, controlling the commutation component to maintain the current state of operation, controlling the electronic expansion valve to increase to a first opening degree, and controlling the compressor to operate at a first defrosting frequency;

[0029] When the air conditioner satisfies the second defrosting condition, controlling the commutation component to maintain the current state of operation, controlling the electronic expansion valve to increase to a second opening degree, and controlling the compressor to operate at a second defrosting frequency; <tmp

[0030] Wherein, the first opening degree is less than the second opening degree, and the first defrosting frequency is less than the second defrosting frequency.

[0031] In addition, to achieve the above object, the present application also provides an air conditioner, which includes: a memory, a processor, and a control program of the air conditioner stored on the memory and operable 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.

[0032] In addition, to achieve the above object, the present application also 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 steps of the control method of the air conditioner described in any one of the above are implemented.

[0033] A control method of an air conditioner provided by the present invention. When defrosting the outdoor heat exchanger is required during the heating process of the air conditioner, during the process of defrosting the outdoor heat exchanger in a preset defrosting mode where the indoor heat exchanger maintains heating, by controlling the operation of the motor in the compressor to increase the heat generation of the winding in 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. Description of the Drawings

[0034] 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;

[0035] Figure 2 It is a schematic flowchart of an embodiment of the control method of the air conditioner of the present invention;

[0036] Figure 3 This is a schematic diagram showing the variation characteristics of the frequency of the compressor and the d-axis current of the motor in the compressor before and after entering the preset defrosting mode for the embodiment of the control method of the air conditioner of the present invention.

[0037] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0038] 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.

[0039] An embodiment of the present invention provides an air conditioner. The air conditioner can include types such as a wall-mounted air conditioner, a cabinet air conditioner, a ceiling-mounted air conditioner, and a central air conditioner.

[0040] Refer 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.

[0041] 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.

[0042] 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.

[0043] 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 3 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.

[0044] 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:

[0045] Heating mode, the reversing component 3 is in the first operating state, the electronic expansion valve 4 operates with a throttling opening, and the refrigerant discharged by the compressor 2 flows through the indoor heat exchanger, the electronic expansion valve 4, and the outdoor heat exchanger in sequence and then returns to the compressor 2. The indoor heat exchanger is in a condensation state, and the outdoor heat exchanger is in an evaporation state. The indoor heat exchanger can release heat to the indoor environment to increase the indoor temperature.

[0046] In the first defrosting mode, the reversing assembly 3 is in the first operating state, the electronic expansion valve 4 operates at a first opening degree which is greater than the throttling opening degree described above. 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 ice and frost on the outdoor heat exchanger.

[0047] In the second defrosting mode, the reversing assembly 3 is in the first operating state, the electronic expansion valve 4 operates at a second opening degree which 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 ice and 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.

[0048] In the refrigeration mode or the third defrosting mode, the reversing assembly 3 is in the second operating state, the electronic expansion valve 4 operates at the 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 ice and 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.

[0049] 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 drivingly connected to the compression cylinder. The stator includes windings, and the windings are installed in the installation cavity and located outside the compression cylinder.

[0050] In this embodiment, the motor is a three-phase motor.

[0051] In the embodiment of the present invention, referring 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.

[0052] Those skilled in the art can understand that Figure 1 the device structure shown in Figure 1 does not constitute a limitation on the device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0053] As Figure 1 shown, the memory 1002, as a computer storage medium, may include a control program for the air conditioner.

[0054] In Figure 1 the device shown, the processor 1001 may be used to call the control program for the air conditioner stored in the memory 1002 and execute the relevant step operations of the control method for the air conditioner in the following embodiments.

[0055] An embodiment of the present invention also provides a control method for an air conditioner.

[0056] Referring to Figure 2 , an embodiment of the control method for the air conditioner of the present application is proposed. In this embodiment, the control method for the air conditioner includes:

[0057] Step S10, controlling the air conditioner to operate in the heating mode;

[0058] In the heating mode, the reversing component is in the first operating state, the electronic expansion valve operates with a throttling opening degree, and the refrigerant discharged from 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 the condensation state, the outdoor heat exchanger is in the evaporation state, and the indoor heat exchanger can release heat to the indoor environment to increase the indoor temperature.

[0059] Step S20, when the air conditioner meets the preset defrosting condition, controlling the air conditioner to operate in the 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 heat generation of the winding in the motor; wherein, the indoor heat exchanger of the air conditioner is in the heating state in both the heating mode and the preset defrosting mode.

[0060] The preset defrosting condition may be the condition that the environmental parameters and / or the self-state parameters of the air conditioner 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 self-state parameters of the air conditioner need to meet when there is a risk of frosting on the outdoor heat exchanger and the frosting thickness is less than the preset thickness.

[0061] During the process of the air conditioner operating in the heating mode, the outdoor environmental parameters and / or the self-state parameters of the air conditioner (such as the temperature parameter of the outdoor heat exchanger, etc.) are detected in real time or at set intervals. According to the detected parameters, it is determined whether the preset defrosting condition is met.

[0062] When the air conditioner switches from the heating mode to the preset defrost mode, at least one of the following parameters can be adjusted to make the air conditioner enter the preset defrost mode: the opening degree of the electronic expansion valve, the compressor frequency, the indoor fan speed, the outdoor fan speed, and so on. In this embodiment, the preset defrost mode may include the above-mentioned first defrost mode or the second defrost mode.

[0063] In this embodiment, the motor in the compressor is a three-phase motor. According to Ohm's law, for a three-phase motor, the winding heating power is W R = 3I 2 R, where I represents the motor phase current and R represents the motor phase resistance. When the winding heating power of the motor increases, the winding temperature will increase, and the motor will transfer heat outward by radiation, increasing the temperature of the compressor cavity and the compressor discharge temperature. The increase in the discharge temperature is beneficial to increasing the heating capacity of the outdoor unit in the non-reversing defrost cycle, generating additional heat to defrost the frost layer on the heat exchanger. Thus, the defrost efficiency in the non-reversing defrost mode is improved, and the defrost time is reduced. Therefore, in order to increase the motor heat generation, it is necessary to increase the motor phase current as much as possible. Based on this, the heat generation of the motor winding can be increased by at least one of the following methods: increasing the motor phase current, increasing the motor phase voltage, and so on.

[0064] The power control parameters (such as current control parameters and / or voltage control parameters, etc.) during the process of increasing the heat generation of the motor winding can be preset fixed parameters or parameters determined according to the actual defrost state of the air conditioner. Among them, different preset defrost modes can correspond to different power control parameters.

[0065] It should be noted that in the preset defrost mode, while the compressor maintains operation at the defrost frequency, the heat generation of the motor winding is increased.

[0066] 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 by using the preset defrost mode in which the indoor heat exchanger maintains heating, by controlling the operation of the motor in the compressor to increase the heat generation of the winding in the motor, the discharge 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 defrost mode.

[0067] Further, based on the above embodiment, another embodiment of the control method for the air conditioner of the present application is proposed. In this embodiment, the step of controlling the operation of the motor in the compressor of the air conditioner to increase the heat generation of the winding in the motor includes: increasing the negative d-axis current of the motor.

[0068] The q-axis and d-axis of the motor are two coordinate axes related to the rotor magnetic field of the motor, and their selection is determined according to the arrangement of the three-phase stator windings of the motor. In an AC motor, the magnetic field of the stator winding is theoretically uniformly distributed, and the components along the two axis directions are equal. Therefore, decomposing the current into the q-axis and d-axis can eliminate the cross influence of the current, so that the current on each axis can be independently controlled. Specifically, the q-axis current is the component perpendicular to the d-axis of the rotor magnetic field, and the d-axis current is the component in the same direction as the rotor magnetic field. By controlling the q-axis current, the speed and torque of the motor can be changed; and by controlling the d-axis current, the power of the motor can be changed.

[0069] When the d-axis current of the motor is positive, the motor operates in the generator state and delivers active power to the power grid; when the d-axis current of the motor is negative, the motor operates in the motor state and absorbs active power from the power grid.

[0070] The negative d-axis current can be used to generate reluctance torque. In addition, at high speeds, the negative d-axis current can reduce the motor voltage, thereby increasing the speed at which the motor can operate. Injecting a negative d-axis current can increase the motor phase current.

[0071] Here, increasing the negative d-axis current of the motor specifically refers to increasing the given value of the negative d-axis current. Refer to Figure 3 , in the heating mode, the given value of the negative d-axis current of the motor is the initial given value Id_ref (that is, the given value of the negative d-axis current at the starting moment of entering the preset defrost mode), and the given value of the negative d-axis current in the preset defrost mode is the target given value Id_limit. The initial given value is less than the target given value. It should be noted that both the initial given value and the target given value here are positive values without considering the negative current.

[0072] The target given value here can be a preset fixed parameter or a value determined according to the preset defrost mode and frosting state parameters of the air conditioner. For example, the target given value here can be determined according to the preset defrost mode, defrost frequency, outdoor heat exchanger temperature, and outdoor environmental parameters, etc.

[0073] In this embodiment, by increasing the negative d-axis current of the motor, the phase current of the motor can be effectively increased, so that the heat generation of the motor winding can be effectively increased, and increasing the negative d-axis current can reduce the restriction on the frequency operation of the compressor during the defrosting process, which is beneficial to further improving the defrosting effect.

[0074] Further, in one embodiment, the step of increasing the negative d-axis current of the motor includes:

[0075] When the preset defrost mode is the first defrost mode, increase the negative d-axis current of the motor according to the first given value;

[0076] When the preset defrosting mode is the second defrosting mode, increase the negative d-axis current of the motor according to a second given value;

[0077] 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 first given value is greater than the second given value.

[0078] 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.

[0079] 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.

[0080] The first given value and the second given value can be pre-set fixed values, or can be determined according to the actual frosting state of the outdoor heat exchanger and / or the preset defrosting mode. In this embodiment, a corresponding relationship between the preset defrosting duration of the preset defrosting mode and the given value is pre-established based on the maximum heating amount allowed for the normal operation of the motor windings. Based on this corresponding relationship, the first given value corresponding to the preset defrosting duration of the first defrosting mode can be determined, and the second given value corresponding to the preset defrosting duration of the second defrosting mode can be determined.

[0081] It should be noted that both the first given value and the second given value here are positive values without considering the negative direction of the current.

[0082] In this embodiment, when the defrosting duration of the first defrosting mode is short, a relatively large current given value can be used to input negative d-axis current to the motor, which is beneficial to ensuring that the motor is not damaged while the total heat generation of the motor windings in the first defrosting mode is as large as possible. When the defrosting duration of the second defrosting mode is long, a relatively small current given value can be used to input negative d-axis current to the motor to prevent the total heat generation of the motor windings from being too large during the entire second defrosting mode and causing damage to the motor. Based on this, it is ensured that regardless of whether the first defrosting mode or the second defrosting mode is adopted, the heat generation can reach the heat required to improve the defrosting effect while protecting the motor.

[0083] In other embodiments, the current given values corresponding to different preset defrosting modes can also be the same.

[0084] Furthermore, in one embodiment, before the step of increasing the negative d-axis current of the motor, it also includes: obtaining the initial frequency of the compressor before the air conditioner meets the preset defrost condition and the defrost frequency of the compressor in the preset defrost mode; determining the current adjustment rate based on the relationship value between the initial frequency and the defrost frequency; the step of increasing the negative d-axis current of the motor includes: increasing the negative d-axis current of the motor according to the current adjustment rate.

[0085] Different preset defrost modes correspond to different defrost frequencies. The preset defrost modes may include the first defrost mode or the second defrost mode described above, and the defrost frequency corresponding to the first defrost mode is smaller than the defrost frequency corresponding to the second defrost mode.

[0086] The initial frequency is specifically the real-time frequency of the compressor before the air conditioner enters the preset defrost mode when it is determined that the preset defrost condition is met during the operation of the heating mode.

[0087] The relationship value may include a difference or a ratio. The current adjustment rate calculated by substituting the relationship value into the formula or looking up the table is referred to herein. Different relationship values may correspond to different current adjustment rates.

[0088] Increase the negative d-axis current of the motor to the target given value according to the current regulation rate.

[0089] In this embodiment, the current adjustment rate is determined in the above manner to control the increase process of the negative d-axis current, which is beneficial to ensure that the heat of the outdoor heat exchanger can be quickly increased after entering the defrost mode while improving the system operation stability, so as to further improve the defrost effect of the outdoor heat exchanger.

[0090] In other embodiments, the current adjustment rate for increasing the negative d-axis current of the motor may also be a preset fixed rate.

[0091] Furthermore, in one embodiment, before the step of controlling the air conditioner to run a preset defrost mode to defrost the outdoor heat exchanger of the air conditioner, and controlling the motor in the compressor of the air conditioner to run to increase the heating value of the winding in the motor, it also includes: when the air conditioner meets the preset defrost condition, determining the target current value of the q-axis of the motor according to the defrost frequency of the compressor in the preset defrost mode; the step of controlling the air conditioner to run a preset defrost mode to defrost the outdoor heat exchanger of the air conditioner, and controlling the motor in the compressor of the air conditioner to run to increase the heating value of the winding in the motor includes: adjusting the q-axis current of the motor according to the target current value so that the compressor reaches the defrost frequency, and increasing the negative d-axis current of the motor.

[0092] Different preset defrosting modes correspond to different defrosting frequencies. The preset defrosting modes may include the first defrosting mode or the second defrosting mode described above, and the defrosting frequency corresponding to the first defrosting mode is less than the defrosting frequency corresponding to the second defrosting mode.

[0093] In this embodiment, through the above method, it is possible to maintain the operating frequency of the compressor at the defrosting frequency required by the preset defrosting mode by controlling the q-axis current, and at the same time increase the heat generation of the winding by increasing the negative d-axis current, thereby further improving the defrosting effect of the outdoor heat exchanger.

[0094] In other embodiments, the current given values corresponding to the d-axis and the q-axis can also be determined according to the defrosting frequency.

[0095] Further, in one embodiment, after the step of increasing the negative d-axis current of the motor, it further includes: when the air conditioner satisfies the defrosting end condition, reducing the negative d-axis current of the motor to the current given value corresponding to the heating mode.

[0096] The current given value here can be the initial given value mentioned in the above embodiment.

[0097] The current change rate during the process of reducing the negative d-axis current here can be a preset fixed rate, or a rate determined according to the actual state of the outdoor heat exchanger. For example, the current change rate here can be determined according to the temperature difference between the current temperature of the outdoor heat exchanger and the frosting temperature, and the negative d-axis current of the motor is reduced to the current given value corresponding to the heating mode according to the current change rate.

[0098] In this embodiment, through the above method, it is beneficial to improve the defrosting effect while ensuring that the system quickly returns to normal heating.

[0099] In other embodiments, the state parameter of the outdoor heat exchanger can also be obtained, and the state parameter represents the frosting risk of the outdoor heat exchanger; the parameter deviation value between the state parameter and the target state parameter is determined; the negative d-axis current of the electronic winding is controlled to be reduced according to the parameter deviation value; wherein, the target state parameter represents the elimination of the frosting risk of the outdoor heat exchanger. The target state parameter here can be the target parameter required by the state parameter in the above defrosting end condition. Different parameter deviation values correspond to different current reduction rates and / or current reduction times. In this embodiment, when the parameter deviation value reaches the preset deviation value, the current reduction rate can be determined according to the parameter deviation value, and the negative d-axis current of the motor is reduced according to the current reduction rate. Based on this, it can be realized that the negative d-axis current of the motor can be reduced in advance before the air conditioner reaches the defrosting end condition, ensuring that the motor can return to the state required by the heating mode when the air conditioner reaches the defrosting end condition, thereby further improving the efficiency of the air conditioner to return to normal heating and improving the indoor thermal comfort.

[0100] 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:

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] Further, in this embodiment, 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 when the air conditioner meets the preset defrosting condition, and 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.

[0106] Combined with Figure 3, 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 means, 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 exhaust temperature of the compressor to decrease rapidly and affect the non-reversing defrosting effect.

[0107] 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 in speed and then turn off.

[0108] 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 degree of balance between indoor heating comfort and the defrosting effect of the outdoor heat exchanger.

[0109] Furthermore, when the air conditioner also has a third defrosting mode (i.e., the cooling defrosting mode), during the process of the air conditioner operating in the heating mode, 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 they are met, then judge whether the air conditioner meets the conditions for entering the third defrosting mode. If the conditions for entering the third defrosting mode are met, control the air conditioner to operate in the third defrosting mode. If the conditions for entering the third defrosting mode are not met, control the air conditioner to maintain the heating mode operation; if the conditions for entering the cooling defrosting judgment are not met, then judge whether the air conditioner meets the above preset defrosting conditions, and when the preset defrosting conditions are met, control the air conditioner to operate in the preset defrosting mode; when the preset defrosting mode is not met, 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.

[0110] In this embodiment, through the above method, it can be ensured that the air conditioner can select different defrosting modes according to different defrosting thicknesses of the outdoor heat exchanger, so as to effectively improve the indoor comfort while ensuring the outdoor defrosting effect.

[0111] In addition, an embodiment of the present invention further provides a storage medium, on which a control program of an 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.

[0112] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover 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 expressly listed, or also includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or system including that element.

[0113] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0114] 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. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above 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.

[0115] 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 equally included in the patent protection scope of the present invention.

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 heat generation of the winding in the motor; Wherein, the indoor heat exchanger of the air conditioner is in a 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 heat generation of the winding in the motor includes: Increase the negative d-axis current of the motor.

3. The control method of the air conditioner according to claim 2, characterized in that, The step of increasing the negative d-axis current of the motor includes: When the preset defrosting mode is the first defrosting mode, increase the negative d-axis current of the motor according to a first given value; When the preset defrosting mode is the second defrosting mode, increase the negative d-axis current of the motor according to a second given value; 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 first given value is greater than the second given value.

4. The control method of the air conditioner according to claim 2, characterized in that, Before the step of increasing the negative d-axis current of the motor, it further includes: Obtain the initial frequency of the compressor before the air conditioner meets the preset defrosting condition and the defrosting frequency of the compressor in the preset defrosting mode; Determine the current adjustment rate according to the relationship value between the initial frequency and the defrosting frequency; The step of increasing the negative d-axis current of the motor includes: Increase the negative d-axis current of the motor according to the current adjustment rate.

5. The control method of the air conditioner according to claim 2, characterized in that, Before the step of controlling the air conditioner to operate in the 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 heat generation of the winding in the motor, it further includes: When the air conditioner meets the preset defrosting condition, determine the target current value of the q-axis of the motor according to the defrosting frequency of the compressor in the preset defrosting mode; The step of controlling the air conditioner to operate in the 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 heat generation of the winding in the motor includes: Adjust the q-axis current of the motor according to the target current value so that the compressor reaches the defrosting frequency, and increase the negative d-axis current of the motor.

6. The control method of the air conditioner according to claim 2, characterized in that, After the step of increasing the negative d-axis current of the motor, it further includes: When the air conditioner meets the defrosting end condition, reduce the negative d-axis current of the motor to the current given value corresponding to the heating mode.

7. The control method of the air conditioner according to any one of claims 1 to 6, 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 when the air conditioner meets the preset defrosting condition and controlling the air conditioner to operate in the preset defrosting mode to defrost the outdoor heat exchanger of the air conditioner includes: 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.

8. The control method of the air conditioner according to claim 7, wherein 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: 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; 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; Wherein, the first opening degree is less than the second opening degree, and the first defrosting frequency is less than the second defrosting frequency.

9. 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 8 are implemented.

10. 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 8 are implemented.

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