Air conditioner and defrosting control method and device thereof

Abstract

The application provides an air conditioner and a defrosting control method and device thereof, the defrosting control method comprising: when the air conditioner enters a defrosting mode, the compressor operating frequency is reduced to a first operating frequency; every first phase difference time, calculate ΔP1=P H1 ‑P L1 ; according to the relationship between the first difference value ΔP1 after the first phase difference time and the first target difference value, control the four-way valve to reverse, enter the refrigeration defrosting mode; the compressor operating frequency is reduced to a second operating frequency; every second phase difference time, calculate ΔP2=P H2 ‑P L2 ; according to the relationship between the second difference value ΔP2 after the second phase difference time and the second target difference value, control the four-way valve to reverse, enter the heating mode. The application solves the problem that the low-frequency operation time length in the technical solution in the related art cannot be adjusted, the high and low pressure difference cannot be accurately identified, the four-way valve reversing is prone to refrigerant reversing noise, and the user experience is affected.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner and its defrosting control method and apparatus. Background Technology

[0002] As people's living standards improve, users are demanding higher levels of room comfort while using air conditioners. Currently, more and more heat pump air conditioners are entering the market, providing users with a better comfort experience. However, during winter heating, when the evaporation temperature of the condenser drops below 0℃, frost will form on the condenser. Furthermore, as the heating time increases, the frost on the condenser will accumulate, severely affecting the heat exchange capacity. At this point, the air conditioner will enter defrosting mode.

[0003] Existing defrosting control methods cannot adjust the compressor's low-frequency running time, making it impossible to determine whether the high-low pressure difference of the air conditioning system is at its minimum when the four-way valve switches after the low-frequency running time. Furthermore, it can easily lead to excessively high pressure in the air conditioning system at the end of the defrosting process, triggering the unit to shut down. If the high-low pressure difference ΔP is too large, the four-way valve can directly switch (from cooling to heating or from heating to cooling), which can easily generate refrigerant switching noise and affect the user experience.

[0004] Therefore, it is evident that the problem with the relevant technology is that the low-frequency operating time of the technical solution cannot be adjusted, and the high and low pressure difference cannot be accurately identified, which makes the refrigerant switching noise easily generated when the four-way valve switches, affecting the user experience. Summary of the Invention

[0005] Therefore, the present invention provides an air conditioner and its defrosting control method and device, which solves the problems in the related technology that the low-frequency operation time cannot be adjusted, the high and low pressure difference cannot be accurately identified, and the four-way valve switching is prone to generating refrigerant switching noise, which affects the user experience.

[0006] To address the aforementioned problems, this invention provides a defrosting control method for an air conditioner. The defrosting control method includes: when the air conditioner enters defrosting mode, reducing the compressor operating frequency to a first operating frequency; running for a first operating time t1; and detecting the first high-pressure P of the air conditioner. H1 and the first low pressure P L1 Calculate ΔP1 = P every first phase difference time interval. H1 -P L1 Based on the relationship between the first difference ΔP1 after the first phase difference time and the first target difference, the four-way valve is controlled to switch, entering the defrosting mode; after the defrosting mode is completed, the compressor operating frequency is reduced to the second operating frequency; the second operating time t2 is run, and the second high-pressure P of the air conditioner is detected. H2 Second low pressure P L2 Calculate ΔP2 = P every second phase difference time.H2 -P L2 Based on the relationship between the second difference value △P2 after the second phase difference time and the second target difference value, the four-way valve is controlled to switch and enter the heating mode.

[0007] Compared with existing technologies, the technical effects achieved by this solution are as follows: Reducing the compressor operating frequency to a first operating frequency narrows the high and low pressure difference in the air conditioning system, preparing for the following steps. The initial operating time further ensures the continued reduction of the high and low pressure difference. By calculating the first difference ΔP1 and utilizing the relationship between ΔP1 and the first target difference, the four-way valve is controlled to switch, shortening the compressor's low-frequency operating time and thus shortening the entire defrosting cycle. Switching when the high and low pressure difference is small reduces refrigerant switching noise, improving the user experience. Subsequently, by reducing the compressor operating frequency to a second operating frequency, the high and low pressure difference in the air conditioning system is narrowed. By calculating the second difference ΔP2 and utilizing the relationship between ΔP2 and the second target difference, the four-way valve is controlled to switch, further shortening the compressor's low-frequency operating time and thus shortening the time it takes for the air conditioner to enter heating mode.

[0008] Furthermore, based on the relationship between the first difference value after the first phase difference time and the first target difference value, the four-way valve is controlled to switch to the refrigeration defrosting mode, including: the first defrosting operation mode, when the first condition is met: △P △t1*n ≤△P 预设1 And △P △t1*n ≥△P △t1*(n-1) In the formula, Δt1 is the first phase difference time, n is the number of first phase difference times, and ΔP 预设1 The first target difference, △P △t1*n The first difference at the current time, ΔP △t1*(n-1) The first difference from the previous moment; the four-way valve reverses to enter the cooling defrosting mode.

[0009] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: when the first condition is met, it means that the current first difference is small and the first difference has begun to rise. At this time, the four-way valve switches and enters the refrigeration defrosting mode. If the four-way valve does not switch when the first difference has begun to rise and continues to operate, the first difference will be larger. When the four-way valve switches later, it will cause the noise to increase when the four-way valve switches, and at the same time shorten the defrosting operation time.

[0010] Furthermore, based on the relationship between the first difference value after the first phase difference time and the first target difference value, the four-way valve is controlled to switch to the refrigeration defrosting mode, which also includes: a second defrosting operation mode, when the second condition: △P is met. △t1*n ≤△P 预设1 And △P △t1*n <△P △t1*(n-1)At that time; the compressor maintains the first operating frequency until the first condition is met, and executes the first defrosting operation mode; in the third defrosting operation mode, when ΔP △t1*n >△P 预设1 When the compressor is in operation, it maintains the first operating frequency until the first condition is met and the first defrosting mode is executed, or the second condition is met and the second defrosting mode is executed.

[0011] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: When the second condition is met, it means that the current first difference is already small and is still decreasing. At this time, the compressor continues to operate at the first operating frequency to keep the value of the first difference at its minimum. When the first difference begins to rise, the first defrosting operation mode is executed to ensure that there is no noise problem when the four-way valve switches. When the third defrosting operation mode is used, it means that the current first difference is large. The compressor continues to operate at the first operating frequency to gradually reduce the first difference, and the first defrosting operation mode is executed when the first condition is met, or the second defrosting operation mode is executed when the second condition is met.

[0012] Furthermore, the second and third defrosting operation modes also include: the first operation time t1 reaches the first preset time t 预设1 The four-way valve is switched to enter the defrosting mode.

[0013] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: when the compressor runs at the first operating frequency, the first difference will not meet the first target difference. When the first operating time of the compressor reaches the first preset time, it means that the low-frequency operating time is long enough, thus avoiding the situation where the compressor runs at a low frequency without reversing.

[0014] Furthermore, detecting the first high-pressure and first low-pressure of the air conditioner includes: operating at a first operating frequency for a first operating time t1, and when the first operating time t1 reaches a second preset time t... 预设2 Then, the first high-pressure and first low-pressure of the air conditioner are tested.

[0015] Compared with existing technologies, the technical effect achieved by adopting this technical solution is as follows: after the first running time reaches the second preset time, the detection is performed, so that the first difference has a process of decreasing and reducing, preventing the first difference from becoming too large.

[0016] Furthermore, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch direction. Before entering the heating mode, this includes: determining the relationship between the current second high-pressure pressure and the preset high-pressure pressure; when ΔP H2 <△P H预设At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch direction, entering the heating mode; when △P H2 ≥△P H预设 When the time is right, the four-way valve is switched to enter the heating mode.

[0017] Compared with existing technologies, the technical effects achieved by this solution are as follows: Before entering defrost mode, the compressor is in heating mode, and the high pressure gradually decreases after the condenser frosts, preventing the triggering of high pressure overload protection; however, after the four-way valve switches from heating mode to cooling mode, the high pressure on the condenser side continuously increases; if the indoor unit is a water-cooled system, the water temperature is higher before defrosting, which can lead to higher high pressure during cooling defrost, easily triggering high pressure shutdown protection. Therefore, the ΔP is judged during low-frequency cooling operation. H2 With △P H预设 The relationship.

[0018] Furthermore, when △P H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch to the heating mode, including: the first heating operation mode, when the third condition is met: △P △t2*m ≤△P 预设2 And △P △t2*m ≥△P △t2*(m-1) In the formula, Δt2 is the second phase difference time, m is the number of second phase difference times, and ΔP is the second phase difference time. 预设2 The second objective difference, ΔP △t2*m The second difference at the current time, ΔP △t2*(m-1) The value is the second difference from the previous moment; the four-way valve reverses, entering heating mode.

[0019] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: when the third condition is met, it means that the current second difference is small and the second difference has begun to rise. At this time, the four-way valve switches and enters the heating mode. If the four-way valve does not switch when the second difference has begun to rise and continues to operate, the second difference will be larger. When the four-way valve switches later, it will cause the noise to increase when the four-way valve switches, and the time to enter the heating mode will also be reduced.

[0020] Furthermore, when △P H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch to the heating mode. This also includes: a second heating operation mode, when the fourth condition is met: △P △t1*m ≤△P 预设1 And △P △t1*m <△P △t1*(m-1)At that time; the compressor maintains the second operating frequency until the third condition is met, then executes the first heating operation mode; in the third heating operation mode, when ΔP △t1*m >△P 预设1 When the compressor maintains the second operating frequency until the third condition is met, the first heating operation mode is executed, or the second heating operation mode is executed when the fourth condition is met.

[0021] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: when the fourth condition is met, △P △t1*m ≤△P 预设1 This indicates that the current second difference is already small, △P △t1*m <△P △t1*(m-1) This indicates that the second difference is still decreasing. The compressor continues to operate at the second operating frequency to reduce the value of the second difference to its minimum. When the second difference begins to rise again, the first heating operation mode is executed to ensure that there is no loud noise when the four-way valve switches. When the third heating operation mode is used, it indicates that the current second difference is large. The compressor continues to operate at the second operating frequency to gradually reduce the second difference. If the third condition is met, the first heating operation mode is executed, or if the fourth condition is met, the second heating operation mode is executed.

[0022] Furthermore, the second and third heating operation modes also include: the second operation time t2 reaching the third preset time t 预设3 The four-way valve is activated to switch to heating mode.

[0023] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: when the compressor runs at the second operating frequency, the second difference may not meet the second target difference. When the second operating time of the compressor reaches the third preset time, it indicates that the low-frequency operating time is long enough, thus avoiding the situation where the compressor runs at a low frequency without reversing and reducing the time to enter the heating mode.

[0024] Furthermore, detecting the second high-pressure and second low-pressure of the air conditioner includes: operating at a second operating frequency for a second operating time t2, and when the second operating time t2 reaches a fourth preset time t... 预设4 Then, the second high-pressure and second low-pressure of the air conditioner are tested.

[0025] Compared with existing technologies, the technical effect achieved by adopting this technical solution is as follows: after the second running time reaches the fourth preset time, the detection is performed, so that the second difference has a process of decreasing and reducing, preventing the second difference from becoming too large.

[0026] This invention also provides a defrosting control device for an air conditioner. The defrosting control device is used to implement the defrosting control method of any of the above embodiments. The defrosting control device includes: a detection module, which is used to acquire the pressure value of the air conditioner and the operating frequency of the compressor; and a control module, which is used to control the four-way valve to switch according to the relationship between a first difference ΔP1 after a first phase difference time and a first target difference, and according to the relationship between a second difference ΔP2 after a second phase difference time and a second target difference.

[0027] The defrosting control device of the air conditioner in this embodiment implements the steps of the defrosting control method of the air conditioner as in any embodiment of this invention, and therefore has all the beneficial effects of the defrosting control method of the air conditioner as in any embodiment of this invention, which will not be repeated here.

[0028] This invention also provides an air conditioner, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the defrosting control method as described in any embodiment of this invention.

[0029] The air conditioner of this invention implements the defrosting control method of the air conditioner as described in any embodiment of this invention, and therefore has all the beneficial effects of the defrosting control method of the air conditioner as described in any embodiment of this invention, which will not be repeated here.

[0030] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0031] (1) Reducing the compressor operating frequency to the first operating frequency can reduce the high and low pressure difference of the air conditioning system, preparing for the following steps. The first operating time further ensures that the high and low pressure difference of the air conditioning system continues to decrease. By calculating the first difference ΔP1, the relationship between the first difference ΔP1 and the first target difference is used to control the reversing of the four-way valve to shorten the low-frequency running time of the compressor, thereby shortening the entire defrosting cycle. Reversing when the high and low pressure difference is small reduces the refrigerant reversing noise and improves the user experience. Subsequently, by reducing the compressor operating frequency to the second operating frequency, the high and low pressure difference of the air conditioning system is reduced. By calculating the second difference ΔP2, the relationship between the second difference ΔP2 and the second target difference is used to control the reversing of the four-way valve to shorten the low-frequency running time of the compressor, thereby shortening the time for the air conditioner to enter the heating mode.

[0032] (2) When the first condition is met, it means that the current first difference is small and the first difference has started to rise. At this time, the four-way valve switches and enters the cooling defrosting mode. If the first difference has started to rise and the four-way valve still does not switch and continues to run, the first difference will be larger. When the four-way valve switches later, the noise will increase when the four-way valve switches, and the defrosting running time will be shortened.

[0033] (3) When the second condition is met, it means that the current first difference is small and the first difference is still decreasing. At this time, the compressor continues to operate at the first operating frequency so that the value of the first difference is at its minimum. When the first difference begins to rise, the first defrost operation mode is executed to ensure that there is no noise problem when the four-way valve reverses. When the third defrost operation mode is used, it means that the current first difference is large. The compressor continues to operate at the first operating frequency to gradually reduce the first difference. The first defrost operation mode is executed when the first condition is met, or the second defrost operation mode is executed when the second condition is met. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the steps of a defrosting control method for an air conditioner, provided in some embodiments of the present invention.

[0035] Figure 2 This is a flowchart illustrating the steps for entering the defrosting mode in some embodiments of the present invention.

[0036] Figure 3 This is a flowchart illustrating the steps for entering the heating mode in some embodiments of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] [First Embodiment]

[0039] See Figures 1-3 This embodiment provides a defrosting control method for an air conditioner. The defrosting control method includes: when the air conditioner enters defrosting mode, the compressor operating frequency is reduced to a first operating frequency; the system operates for a first operating time t1, and the first high-pressure P of the air conditioner is detected. H1 and the first low pressure P L1 Calculate ΔP1 = P every first phase difference time interval. H1 -P L1 Based on the relationship between the first difference ΔP1 after the first phase difference time and the first target difference, the four-way valve is controlled to switch, entering the defrosting mode; after the defrosting mode is completed, the compressor operating frequency is reduced to the second operating frequency; the second operating time t2 is run, and the second high-pressure P of the air conditioner is detected. H2 Second low pressure P L2 Calculate ΔP2 = P every second phase difference time. H2 -PL2 Based on the relationship between the second difference value △P2 after the second phase difference time and the second target difference value, the four-way valve is controlled to switch and enter the heating mode.

[0040] In this embodiment, reducing the compressor operating frequency to a first operating frequency reduces the high and low pressure difference in the air conditioning system, preparing for the following steps. Running for a first operating time further ensures the high and low pressure difference continues to decrease. By calculating a first difference ΔP1 and utilizing the relationship between ΔP1 and a first target difference, the four-way valve is controlled to switch, shortening the compressor's low-frequency operating time and thus shortening the entire defrosting cycle. Switching when the high and low pressure difference is small reduces refrigerant switching noise, improving the user experience. Subsequently, by reducing the compressor operating frequency to a second operating frequency, the high and low pressure difference in the air conditioning system is further reduced. By calculating a second difference ΔP2 and utilizing the relationship between ΔP2 and a second target difference, the four-way valve is controlled to switch, further shortening the compressor's low-frequency operating time and thus shortening the time it takes for the air conditioner to enter heating mode.

[0041] In one specific embodiment, detecting the first high-pressure and first low-pressure of the air conditioner includes: running at a first operating frequency for a first operating time t1, and when the first operating time t1 reaches a second preset time t... 预设2 Then, the first high-pressure and first low-pressure of the air conditioner are tested.

[0042] Understandably, detection is performed after the first running time reaches the second preset time, so that the first difference decreases and prevents the first difference from becoming too large.

[0043] Optional, second preset time t 预设2 The value range is 0s-100s.

[0044] For example, the second preset time t 预设2 For example, setting it to 45 seconds can effectively reduce the first difference, preventing it from becoming too large.

[0045] In a specific embodiment, based on the relationship between the first difference value after the first phase difference time and the first target difference value, the four-way valve is controlled to switch to the defrosting mode, including: a first defrosting operation mode, when the first condition: △P is met. △t1*n ≤△P 预设1 And △P △t1*n ≥△P △t1*(n-1) In the formula, Δt1 is the first phase difference time, n is the number of first phase difference times, and ΔP 预设1 The first target difference, △P △t1*n The first difference at the current time, ΔP △t1*(n-1)The first difference from the previous moment; the four-way valve reverses to enter the cooling defrosting mode.

[0046] It should be noted that when the first condition is met, it means that the current first difference is already small and the first difference has started to rise. At this time, the four-way valve switches and enters the cooling defrosting mode. If the four-way valve does not switch when the first difference has already started to rise and continues to run, the first difference will be larger. When the four-way valve switches later, it will cause the noise to increase and shorten the defrosting operation time.

[0047] Optionally, the first target difference △P 预设1 The value range is 0.3-2 MPa.

[0048] Furthermore, based on the relationship between the first difference value after the first phase difference time and the first target difference value, the four-way valve is controlled to switch to the refrigeration defrosting mode, which also includes: a second defrosting operation mode, when the second condition: △P is met. △t1*n ≤△P 预设1 And △P △t1*n <△P △t1*(n-1) At that time; the compressor maintains the first operating frequency until the first condition is met, and executes the first defrosting operation mode; in the third defrosting operation mode, when ΔP △t1*n >△P 预设1 When the compressor is in operation, it maintains the first operating frequency until the first condition is met and the first defrosting mode is executed, or the second condition is met and the second defrosting mode is executed.

[0049] Understandably, when the second condition is met, it means that the current first difference is already small and is still decreasing. At this time, the compressor continues to operate at the first operating frequency to keep the value of the first difference at its minimum. When the first difference starts to rise, the first defrost operating mode is executed to ensure that there is no loud noise when the four-way valve switches. When the third defrost operating mode is used, it means that the current first difference is large. The compressor continues to operate at the first operating frequency to gradually reduce the first difference. If the first condition is met, the first defrost operating mode is executed, or if the second condition is met, the second defrost operating mode is executed.

[0050] In one specific embodiment, the second defrosting operation mode and the third defrosting operation mode further include: the first operation time t1 reaching the first preset time t 预设1 The four-way valve is switched to enter the defrosting mode.

[0051] It should be noted that when the compressor runs at the first operating frequency, the first difference may fail to meet the first target difference. When the compressor's first operating time reaches the first preset time, it means that the low-frequency operating time has been long enough to avoid the compressor running at a low frequency without reversing.

[0052] Optional, first preset time t 预设1 The value range is 0s-100s.

[0053] In one specific embodiment, detecting the second high-pressure and second low-pressure of the air conditioner includes: operating at a second operating frequency for a second operating time t2, and when the second operating time t2 reaches a fourth preset time t... 预设4 Then, the second high-pressure and second low-pressure of the air conditioner are tested.

[0054] It should be noted that the detection is performed after the second running time reaches the fourth preset time, so that the second difference has a process of decreasing and reducing, to prevent the second difference from becoming too large.

[0055] Optional, fourth preset time t 预设4 The value range is 0s-100s.

[0056] For example, the fourth preset time t 预设4 For example, setting it to 55s can effectively reduce the second difference, preventing it from becoming too large.

[0057] In a specific embodiment, before controlling the four-way valve to switch directions based on the relationship between the second difference value after the second phase difference time and the second target difference value, and before entering the heating mode, the process includes: determining the relationship between the current second high-pressure pressure and the preset high-pressure pressure; when ΔP H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch direction, entering the heating mode; when △P H2 ≥△P H预设 When the time is right, the four-way valve is switched to enter the heating mode.

[0058] It should be noted that before entering defrost mode, the compressor is in heating mode. After the condenser frosts up, the high pressure will gradually decrease, preventing the high pressure overload protection from being triggered. However, after the four-way valve switches from heating to cooling mode, the high pressure on the condenser side will continuously increase. If the indoor unit is a water-cooled system, the water temperature will be higher before defrosting, leading to a higher high pressure during cooling defrost, which can easily trigger the high pressure shutdown protection. Therefore, when operating at low frequency in cooling mode, the pressure ΔP should be carefully assessed. H2 With △P H预设 The relationship when △P H2 ≥△P H预设 This indicates that the air conditioning system's high pressure is already too high. To avoid high pressure protection shutdown, the four-way valve is switched to heating mode.

[0059] Optional, △P H预设 The value range is 2.5-5 MPa.

[0060] Furthermore, when △P H2<△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch to the heating mode, including: the first heating operation mode, when the third condition is met: △P △t2*m ≤△P 预设2 And △P △t2*m ≥△P △t2*(m-1) In the formula, Δt2 is the second phase difference time, m is the number of second phase difference times, and ΔP is the second phase difference time. 预设2 The second objective difference, ΔP △t2*m The second difference at the current time, ΔP △t2*(m-1) The value is the second difference from the previous moment; the four-way valve reverses, entering heating mode.

[0061] Understandably, if the third condition is met, it means that the current second difference is already small and the second difference has started to rise. At this time, the four-way valve switches and enters the heating mode. If the four-way valve does not switch when the second difference has already started to rise and continues to run, the second difference will be larger. When the four-way valve switches later, it will cause the noise to increase when the four-way valve switches, and the time to enter the heating mode will also be reduced.

[0062] Optional, second objective difference ΔP 预设2 The value range is 0.3-2 MPa.

[0063] Furthermore, when △P H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch to the heating mode. This also includes: a second heating operation mode, when the fourth condition is met: △P △t1*m ≤△P 预设1 And △P △t1*m <△P △t1*(m-1) At that time; the compressor maintains the second operating frequency until the third condition is met, then executes the first heating operation mode; in the third heating operation mode, when ΔP △t1*m >△P 预设1 When the compressor maintains the second operating frequency until the third condition is met, the first heating operation mode is executed, or the second heating operation mode is executed when the fourth condition is met.

[0064] It should be noted that when the fourth condition is met, it means that the current second difference is already small and is still decreasing. At this time, the compressor continues to operate at the second operating frequency to keep the value of the second difference at its minimum. When the second difference begins to rise, the first heating operation mode is executed to ensure that there is no loud noise when the four-way valve switches. When the third heating operation mode is used, it means that the current second difference is large. The compressor continues to operate at the second operating frequency to gradually reduce the second difference. If the third condition is met, the first heating operation mode is executed, or if the fourth condition is met, the second heating operation mode is executed.

[0065] Furthermore, the second and third heating operation modes also include: the second operation time t2 reaching the third preset time t 预设3 The four-way valve is activated to switch to heating mode.

[0066] It should be noted that when the compressor runs at the second operating frequency, the second difference may fail to meet the second target difference. When the compressor's second operating time reaches the third preset time, it indicates that the low-frequency operating time has been long enough to avoid the compressor running at a low frequency without reversing.

[0067] Optional, third preset time t 预设3 The value range is 0s-100s.

[0068] [Second Embodiment]

[0069] This invention also provides a defrosting control device for an air conditioner. The defrosting control device is used to implement the defrosting control method of any of the above embodiments. The defrosting control device includes: a detection module, which is used to acquire the pressure value of the air conditioner and the operating frequency of the compressor; and a control module, which is used to control the four-way valve to switch according to the relationship between a first difference ΔP1 after a first phase difference time and a first target difference, and according to the relationship between a second difference ΔP2 after a second phase difference time and a second target difference.

[0070] The defrosting control device of the air conditioner in this embodiment implements the steps of the defrosting control method of the air conditioner as in any embodiment of this invention, and therefore has all the beneficial effects of the defrosting control method of the air conditioner as in any embodiment of this invention, which will not be repeated here.

[0071] [Third Embodiment]

[0072] This invention also provides an air conditioner, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the defrosting control method as described in any embodiment of this invention.

[0073] The air conditioner of this invention implements the defrosting control method of the air conditioner as described in any embodiment of this invention, and therefore has all the beneficial effects of the defrosting control method of the air conditioner as described in any embodiment of this invention, which will not be repeated here.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrosting control method for an air conditioner, characterized in that, The defrosting control method includes: When the air conditioner enters defrost mode, the compressor operating frequency is reduced to the first operating frequency; During the first running time t1, the first high-pressure P of the air conditioner is detected. H1 and the first low pressure P L1 Calculate ΔP1 = P every first phase difference time interval. H1 -P L1 ; Based on the relationship between the first difference ΔP1 after the first phase difference time and the first target difference, control the four-way valve to switch and enter the cooling defrosting mode. After the defrosting mode is completed, the compressor operating frequency is reduced to the second operating frequency; During the second running time t2, the second high-pressure P of the air conditioner is detected. H2 Second low pressure P L2 Calculate ΔP2 = P every second phase difference time. H2 -P L2 ; Based on the relationship between the second difference ΔP2 after the second phase difference time and the second target difference, control the four-way valve to switch and enter the heating mode; The step of controlling the four-way valve to switch to the defrosting mode based on the relationship between the first difference value after the first phase time and the first target difference value includes: The first defrosting operation mode, when the first condition is met: △P △t1 n ≤△P 预设1 And △P △t1 n ≥△P △t1 (n-1) In the formula, Δt1 is the first phase difference time, n is the number of the first phase difference times, and ΔP 预设1 The first target difference, △P △t1 n Let ΔP be the first difference at the current moment. △t1 (n-1) This is the first difference from the previous moment; The four-way valve switches to enter the cooling defrosting mode; The step of controlling the four-way valve to switch to the defrosting mode based on the relationship between the first difference value after the first phase time and the first target difference value further includes: The second defrosting operation mode, when the second condition is met: △P △t1 n ≤△P 预设1 And △P △t1 n <△P △t1 (n-1) At that time, the compressor maintains the first operating frequency until the first condition is met, and executes the first defrosting operation mode; The third defrosting operation mode, when △P △t1 n >△P 预设1 When the first operating frequency is met, the compressor maintains operation until the first condition is met to execute the first defrosting operation mode, or until the second condition is met to execute the second defrosting operation mode.

2. The defrosting control method according to claim 1, characterized in that, The second defrost operating mode and the third defrost operating mode further include: The first running time t1 reaches the first preset time t 预设1 The four-way valve is switched to enter the cooling defrosting mode.

3. The defrosting control method according to claim 1, characterized in that, The detection of the first high-pressure and first low-pressure of the air conditioner includes: The first running time t1 is run at the first running frequency, and when the first running time t1 reaches the second preset time t... 预设2 Then, the first high pressure and the first low pressure of the air conditioner are tested.

4. The defrosting control method according to claim 1, characterized in that, Before controlling the four-way valve to switch based on the relationship between the second difference value after the second phase difference time and the second target difference value, and before entering the heating mode, the following steps are included: Determine the difference between the current second high-pressure pressure and the preset high-pressure pressure ΔP. H预设 The relationship between them; When △P H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch direction to enter the heating mode; When △P H2 ≥△P H预设 When the time is right, the four-way valve is switched to enter the heating mode.

5. The defrosting control method according to claim 4, characterized in that, When △P H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch to the heating mode, including: In the first heating operation mode, when the third condition is met: △P △t2 m ≤△P 预设2 And △P △t2 m ≥△P △t2 (m-1) In the formula, Δt2 is the second phase difference time, m is the number of second phase difference times, and ΔP 预设2 The second objective difference, ΔP △t2 m The second difference at the current time, ΔP △t2 (m-1) This is the second difference from the previous moment; The four-way valve switches to the heating mode.

6. The defrosting control method according to claim 5, characterized in that, When △P H2 <△P H预设 At that time, based on the relationship between the second difference value after the second phase difference time and the second target difference value, the four-way valve is controlled to switch to the heating mode, and the method further includes: The second heating operation mode, when the fourth condition is met: △P △t1 m ≤△P 预设1 And △P △t1 m <△P △t1 (m-1) The compressor maintains the second operating frequency until the third condition is met, at which point it executes the first heating operation mode. The third heating operation mode, when ΔP △t1 m >△P 预设1 When the compressor maintains the second operating frequency until the third condition is met, the first heating operation mode is executed; or when the fourth condition is met, the second heating operation mode is executed.

7. The defrosting control method according to claim 6, characterized in that, The second heating operation mode and the third heating operation mode further include: The second running time t2 reaches the third preset time t 预设3 The four-way valve is switched to enter the heating mode.

8. The defrosting control method according to claim 4, characterized in that, The detection of the second high-pressure and second low-pressure of the air conditioner includes: The second running time t2 is run at the second running frequency, and when the second running time t2 reaches the fourth preset time t... 预设4 Then, the second high-pressure and second low-pressure of the air conditioner are tested.

9. A defrosting control device for an air conditioner, the defrosting control device being used to implement the defrosting control method as described in any one of claims 1-8, characterized in that, The defrosting control device includes: A detection module is used to acquire the pressure value of the air conditioner and the operating frequency of the compressor; The control module is used to control the four-way valve to switch directions based on the relationship between the first difference ΔP1 after the first phase time and the first target difference, and based on the relationship between the second difference ΔP2 after the second phase time and the second target difference.

10. An air conditioner, characterized in that, The air conditioner includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the defrosting control method as described in any one of claims 1 to 8.

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