Air conditioner heating and defrosting control system, control method and air conditioner

Abstract

The present invention relates to the technical field of air conditioners, and provides a heating and defrosting control system for an air conditioner, a control method and an air conditioner. The heating and defrosting control system for an air conditioner includes: an outdoor unit, an outdoor fan, a first sensor, an electronic expansion valve and a controller. The outdoor fan is arranged in the outdoor unit; the first sensor is arranged on the condenser of the outdoor unit and is used for detecting the temperature of the condenser; the electronic expansion valve is arranged between the condenser and the evaporator of the indoor unit; the controller is electrically connected to the first sensor, the outdoor fan and the electronic expansion valve respectively, and the controller is configured to adjust the rotation speed of the outdoor fan and the opening degree of the electronic expansion valve based on the detected temperature of the condenser when the air conditioner is in the heating mode. By simultaneously adjusting the outdoor fan and the electronic expansion valve, the present invention can increase the temperature of the condenser, slow down the frosting rate, reduce the defrosting times, improve the heating effect, help to increase the average indoor temperature, reduce the temperature fluctuation, and improve the user experience.

Description

Technical Field

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

[0002] An air conditioner is a household appliance that can achieve refrigeration or heating, mainly including an outdoor unit and an indoor unit. The outdoor unit is generally provided with components such as a compressor, an outdoor fan and a condenser, and the indoor unit is generally provided with components such as an indoor fan and an evaporator.

[0003] When the air conditioner operates in the heating mode, the outdoor condenser performs an evaporation function and needs to absorb heat from the outdoor environment of the low-temperature heat source. The surface temperature of the condenser is generally relatively low, usually below 0°C. Therefore, during operation, water vapor in the air is easily condensed into frost on the surface of the condenser. The frosting of the condenser causes the heat exchange effect to be further reduced, the temperature of the condenser to decrease, and the frosting to be more serious, resulting in a vicious cycle. Therefore, the air conditioner needs to defrost frequently, and during the defrosting process, the indoor heat exchange temperature is low, generally the indoor fan stops running, and the indoor does not heat, which will cause the indoor temperature to fluctuate and seriously affect the user experience. Summary of the Invention

[0004] The present invention provides a heating and defrosting control system, a control method and an air conditioner for an air conditioner. By simultaneously adjusting the outdoor fan and the electronic expansion valve to increase the temperature of the condenser, the defrosting frequency can be reduced, the heating effect can be improved, which helps to increase the average indoor temperature and reduce the temperature fluctuation, thereby improving the user experience.

[0005] The present invention provides a heating and defrosting control system for an air conditioner, including:

[0006] An outdoor unit;

[0007] An outdoor fan disposed inside the outdoor unit;

[0008] A first sensor disposed on the condenser of the outdoor unit for detecting the temperature of the condenser;

[0009] An electronic expansion valve disposed between the condenser and the evaporator of the indoor unit;

[0010] A controller electrically connected to the first sensor, the outdoor fan and the electronic expansion valve respectively. The controller is configured to adjust the rotation speed of the outdoor fan and the opening degree of the electronic expansion valve based on the detected temperature of the condenser when the air conditioner is in the heating mode.

[0011] According to a heating and defrosting control system for an air conditioner provided by the present invention, it further includes: a first timer, and the first timer is electrically connected to the controller for timing the continuous operation duration after the outdoor fan is adjusted to the target rotation speed value.

[0012] According to an air conditioner heating and defrosting control system provided by the present invention, it further includes: a second timer, which is electrically connected to the controller and is used to time the continuous operation duration after the electronic expansion valve is adjusted to the target opening value.

[0013] According to an air conditioner heating and defrosting control system provided by the present invention, it further includes: a heating device, which is arranged on the condenser and is electrically connected to the controller and is used to heat the condenser.

[0014] According to an air conditioner heating and defrosting control system provided by the present invention, the heating device is a heating wire, and the heating wire is spirally wound around the heat exchange coil of the condenser with a pitch.

[0015] According to an air conditioner heating and defrosting control system provided by the present invention, it further includes: a second sensor, which is respectively electrically connected to the electronic expansion valve and the controller and is used to detect the opening of the electronic expansion valve.

[0016] According to an air conditioner heating and defrosting control system provided by the present invention, it further includes: a third sensor, which is arranged on the condenser and is electrically connected to the controller and is used to detect whether the condenser is frosted.

[0017] According to an air conditioner heating and defrosting control system provided by the present invention, the third sensor is at least one of a camera and a radar.

[0018] The present invention also provides an air conditioner heating and defrosting control method, including:

[0019] In response to the air conditioner being in the heating mode, detecting the temperature of the condenser of the outdoor unit;

[0020] Based on the detected temperature of the condenser, adjusting the rotation speed of the outdoor fan and the opening of the electronic expansion valve.

[0021] According to an air conditioner heating and defrosting control method provided by the present invention, the step of adjusting the rotation speed of the outdoor fan and the opening of the electronic expansion valve based on the detected temperature of the condenser specifically includes:

[0022] When the detected temperature of the condenser is greater than the preset defrosting temperature, and the difference between the detected temperature of the condenser and the preset defrosting temperature is smaller, controlling the rotation speed of the outdoor fan to be greater and the opening of the electronic expansion valve to be smaller;

[0023] When the detected temperature of the condenser is less than or equal to the preset defrosting temperature, controlling the air conditioner to enter the defrosting mode.

[0024] The present invention further provides an air conditioner, which includes the above-mentioned heating and defrosting control system for the air conditioner, or adopts the above-mentioned heating and defrosting control method for the air conditioner when performing heating and defrosting.

[0025] The heating and defrosting control system, control method and air conditioner provided by the present invention can adjust the heat exchange air volume through the outdoor fan, can detect the temperature of the condenser by arranging the first sensor on the condenser of the outdoor unit; can adjust the refrigerant flow rate of the air conditioner by arranging the electronic expansion valve between the condenser and the evaporator of the indoor unit; and can, when the air conditioner is in the heating mode, adjust the rotation speed of the outdoor fan and the opening degree of the electronic expansion valve based on the detected temperature of the condenser through the controller electrically connected to the first sensor, the outdoor fan and the electronic expansion valve respectively, so as to increase the temperature of the condenser, thereby delaying the frosting rate, reducing the defrosting times, improving the heating effect, helping to increase the average indoor temperature, reducing the temperature fluctuation, and thus improving the user experience. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is a schematic structural diagram of the heating and defrosting control system for the air conditioner provided by the present invention;

[0028] Figure 2 is a schematic flow diagram of the heating and defrosting control method for the air conditioner provided by the present invention;

[0029] Figure 3 is a schematic structural diagram of the electronic device provided by the present invention.

[0030] Reference Numerals:

[0031] 1: Outdoor fan; 2: First sensor; 3: Electronic expansion valve; 4: Controller;

[0032] 5: First timer; 6: Second timer; 7: Heating device; 8: Second sensor;

[0033] 9: Driving motor; 10: Third sensor;

[0034] 11: Processor; 12: Communication interface; 13: Memory; 14: Communication bus. Detailed Embodiments

[0035] To make the objectives, technical solutions and advantages of the present invention more clear, the following will, in conjunction with the accompanying drawings in the present invention, clearly and completely describe the technical solutions in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the scope of protection of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood in specific situations.

[0038] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] The following will be combined with Figures 1 - 3 Describe the heating and defrosting control system, control method and air conditioner of the present invention.

[0041] According to an embodiment of the first aspect of the present invention, with reference to Figure 1 As shown, the heating and defrosting control system of the air conditioner provided by the present invention mainly includes: an outdoor unit, an outdoor fan 1, a first sensor 2, an electronic expansion valve 3, and a controller 4.

[0042] Among them, the outdoor fan 1 is arranged inside the outdoor unit. By means of the outdoor fan 1, the contact air volume between the outdoor air and the condenser inside the outdoor unit can be increased. At this time, the temperature of the condenser is lower than the outdoor temperature. Therefore, more heat can be brought to the condenser, the temperature of the condenser can be increased, the surface temperature of the condenser can be prevented from dropping, and thus the frosting rate can be delayed.

[0043] The first sensor 2 is arranged on the condenser of the outdoor unit. Through the first sensor 2, the temperature of the condenser can be detected in real time, and the detected temperature of the condenser is sent to the controller 4.

[0044] The electronic expansion valve 3 is arranged in the refrigerant circulation pipeline between the condenser and the evaporator of the indoor unit. By adjusting the opening degree of the electronic expansion valve 3, the refrigerant flow rate in the air conditioner circulation pipeline can be adjusted, so as to adjust the heating effect. And when the opening degree of the electronic expansion valve 3 decreases, the refrigerant flow rate in the air conditioner circulation pipeline decreases, and the compressor exhaust temperature increases, thereby increasing the temperature of the outdoor condenser, delaying the frosting rate, and further improving the heating effect of the air conditioner.

[0045] The controller 4 is electrically connected to the first sensor 2, the outdoor fan 1, and the electronic expansion valve 3 respectively. The controller 4 is configured to adjust the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 based on the detected temperature of the condenser when the air conditioner is in the heating mode.

[0046] Specifically, when the detected temperature of the condenser is greater than the preset defrosting temperature, and the difference between the detected temperature of the condenser and the preset defrosting temperature is smaller, the rotation speed of the outdoor fan 1 is controlled to be greater, and the opening degree of the electronic expansion valve 3 is smaller, so as to effectively increase the temperature of the condenser; when the detected temperature of the condenser is less than or equal to the preset defrosting temperature, the air conditioner is controlled to enter the defrosting mode.

[0047] The heating and defrosting control system of the air conditioner provided by the embodiment of the present invention can adjust the heat exchange air volume through the outdoor fan 1, can detect the temperature of the condenser through the first sensor 2 arranged on the condenser of the outdoor unit; can adjust the refrigerant flow rate of the air conditioner through the electronic expansion valve 3 arranged between the condenser and the evaporator of the indoor unit; and can adjust the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 based on the detected temperature of the condenser when the air conditioner is in the heating mode through the controller 4 which is electrically connected to the first sensor 2, the outdoor fan 1 and the electronic expansion valve 3 respectively. Therefore, by adjusting the outdoor fan 1 and the electronic expansion valve 3 simultaneously, the present invention can effectively increase the temperature of the condenser, greatly delay the frosting rate, thereby reducing the defrosting frequency, improving the heating effect, helping to increase the average indoor temperature, reducing the temperature fluctuation, and thus improving the user experience.

[0048] According to an embodiment of the present invention, referring to Figure 1 As shown, the heating and defrosting control system of the air conditioner further includes: a first timer 5, the first timer 5 is electrically connected to the controller 4, and through the first timer 5, the continuous operation duration after the outdoor fan 1 is adjusted to the target rotation speed value can be timed.

[0049] Specifically, after the rotation speed of the outdoor fan 1 is adjusted to the target rotation speed value, it runs continuously for a period of time, and the first timer 5 times this period of operation duration and sends the operation duration value to the controller 4. The controller 4 compares the actual operation duration with the set duration until the operation duration of the outdoor fan 1 at this target rotation speed value reaches the set duration, which can further increase the heat exchange amount of the condenser, thereby increasing the temperature of the condenser and delaying the frosting rate.

[0050] According to an embodiment of the present invention, referring to Figure 1 As shown, the heating and defrosting control system of the air conditioner further includes: a second timer 6, the second timer 6 is electrically connected to the controller 4, and through the second timer 6, the continuous operation duration after the electronic expansion valve 3 is adjusted to the target opening degree value can be timed.

[0051] Specifically, after the opening degree of the electronic expansion valve 3 is adjusted to the target opening degree value, it runs continuously for a period of time, and the second timer 6 times this period of operation duration and sends the operation duration value to the controller 4. The controller 4 compares the actual operation duration with the set duration until the operation duration of the electronic expansion valve 3 at this target opening degree value reaches the set duration, which can further increase the temperature of the condenser and delay the frosting rate.

[0052] According to an embodiment of the present invention, referring to Figure 1As shown, the heating and defrosting control system of the air conditioner further includes: a heating device 7, which is arranged on the condenser and electrically connected to the controller 4 for heating the condenser.

[0053] It can be understood that before the condenser frosts, heating the condenser through the heating device 7 can increase the temperature of the heat exchange coil of the condenser to avoid the decrease of the surface temperature of the heat exchange coil, thereby delaying the frosting rate; and when defrosting is required after the condenser frosts, the heating device 7 can also be used to heat the condenser to achieve defrosting.

[0054] According to an embodiment of the present invention, the heating device 7 is a heating wire, and the heating wire is helically wound around the heat exchange coil of the condenser with a pitch. By winding the heating wire around the heat exchange coil of the condenser, on the one hand, the occupied space of the heating device 7 can be reduced, which is beneficial to the miniaturization of the overall volume of the outdoor unit; on the other hand, the heating effect on the condenser can be effectively improved.

[0055] Moreover, it should be noted that in order to ensure the heat exchange effect between the condenser and the outdoor air as much as possible, the heating wire is designed in a spiral shape with a pitch. Generally, the larger the pitch, the better the heat exchange effect of the condenser.

[0056] According to an embodiment of the present invention, referring to Figure 1 As shown, the heating and defrosting control system of the air conditioner further includes: a second sensor 8, which is electrically connected to the electronic expansion valve 3 and the controller 4 respectively. Through the second sensor 8, the opening degree of the electronic expansion valve 3 can be detected in real time.

[0057] And when the detected opening degree of the electronic expansion valve 3 is greater than the minimum set opening degree of the electronic expansion valve 3, the electronic expansion valve 3 can be adjusted; when the detected opening degree of the electronic expansion valve 3 is less than or equal to the minimum set opening degree of the electronic expansion valve 3, the electronic expansion valve 3 is not adjusted. At this time, the temperature of the outdoor condenser can be adjusted by adjusting the outdoor fan 1. Among them, the heating effect of adjusting the outdoor fan 1 is greater than that of adjusting the electronic expansion valve 3.

[0058] In addition, the controller 4 is electrically connected to the electronic expansion valve 3 through the drive motor 9, and can send a control command to the drive motor 9 according to the adjustment requirement of the refrigerant flow rate. After receiving the control command, the drive motor 9 drives the valve needle of the electronic expansion valve 3 to move up and down to adjust the valve opening degree according to the valve opening degree information specified in the control command, so as to realize the adjustment of the refrigerant flow rate. Among them, the drive motor 9 is generally a stepping motor, and of course, it can also be other types of motors.

[0059] According to an embodiment of the present invention, referring to Figure 1As shown in the figure, the heating and defrosting control system of the air conditioner further includes: a third sensor 10, which is arranged on the condenser, and the third sensor 10 is electrically connected to the controller 4. Through the third sensor 10, it can be detected whether the condenser is frosted.

[0060] There is no particular limitation on the specific type of the third sensor 10 of the present invention. For example, the third sensor 10 can be at least one of a camera and a radar.

[0061] Specifically, when the third sensor 10 is a camera, the camera sends the captured picture of the condenser to the controller 4, and the controller 4 compares the information of the captured picture of the condenser with the standard picture to determine whether the condenser is frosted. When frosting occurs, the defrosting mode is entered, where the standard picture is the picture of the condenser without frosting.

[0062] When the third sensor 10 is a radar, when frosting occurs on the condenser, it will cause attenuation of radio frequency electromagnetic waves, which will ultimately affect the observation result of the radar. Therefore, it can also be determined whether the condenser is frosted by using a radar.

[0063] In the embodiment of the present invention, the frosting condition can be quickly and directly detected by the camera and the radar, so as to facilitate timely defrosting treatment, which is beneficial to improving the control efficiency of the system.

[0064] Next, the heating and defrosting control method of the air conditioner provided by the present invention will be described. The heating and defrosting control method of the air conditioner described below can be mutually referred to the heating and defrosting control device described above.

[0065] According to an embodiment of the second aspect of the present invention, the present invention also provides a heating and defrosting control method of an air conditioner, referring to Figure 2 As shown in the figure, it mainly includes:

[0066] S100. In response to the air conditioner being in the heating mode, detect the temperature of the condenser of the outdoor unit.

[0067] Specifically, the temperature of the condenser of the outdoor unit is detected in real time by the first sensor 2.

[0068] S200. Based on the detected temperature of the condenser, adjust the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3.

[0069] Specifically, when the detected temperature T of the condenser c is greater than the preset defrosting temperature T a , and the detected temperature T of the condenser c and the preset defrosting temperature T aThe smaller the temperature difference △T, the greater the rotational speed f of the outdoor fan 1 is controlled, and the smaller the opening degree H of the electronic expansion valve 3 is, thereby effectively increasing the temperature of the condenser; when the detected temperature T of the condenser c is less than or equal to the preset defrosting temperature T a , the air conditioner is controlled to enter the defrosting mode.

[0070] Among them, the preset defrosting temperature T a is a set value in the controller, and the preset defrosting temperature T a is related to the outdoor ambient temperature T ao , and the relationship between the two is:

[0071] T a = C × T ao - α;

[0072] Among them: C: when T ao < 0°C, C can be 0.8, when T ao ≥ 0°C, C can be 0.6; α is a fixed value, for example, α is 6.

[0073] In a specific example, the preset defrosting temperature T a is divided into multiple continuous defrosting control temperature segments, specifically as follows:

[0074] When △T ≥ T1, the rotational speed f of the outdoor fan 1 and the opening degree H of the electronic expansion valve 3 are not adjusted and operate at the current rotational speed and valve opening degree;

[0075] When T2 < △T < T1, the rotational speed of the outdoor fan 1 is increased to f1, and the opening degree of the electronic expansion valve 3 is adjusted to H1;

[0076] When T3 < △T ≤ T2, the rotational speed of the outdoor fan 1 is increased to f2, and the opening degree of the electronic expansion valve 3 is adjusted to H2;

[0077] When 0 < △T ≤ T3, the rotational speed of the outdoor fan 1 is increased to f max , and the opening degree of the electronic expansion valve 3 is adjusted to H min ;

[0078] When △T ≤ 0, the air conditioner enters the defrosting mode.

[0079] Among them, f1, f2, f max are respectively the target rotational speed values of each defrosting control temperature segment, and f1 < f2 < f max , f max is the maximum rotational speed of the outdoor fan 1; correspondingly, H1, H2, H min are respectively the target opening degree values of each defrosting control temperature segment, H min < H2 < H1, H minis the minimum set opening degree of the electronic expansion valve 3.

[0080] Moreover, the above parameters can be designed according to the actual working conditions. For example:

[0081] T1 = 10°C; T2 = 8°C; T3 = 5°C; f = 820 r / min; f1 = 850 r / min; f2 = 900 r / min; f max = 1100 r / min;

[0082] H min = 260; H2 = 280; H1 = 300; H = 360. The range of the electronic expansion valve is 0 - 500, unit: step.

[0083] It can be understood that when the detected opening degree H of the electronic expansion valve 3 > H min at this time, the electronic expansion valve 3 can be adjusted. When H ≤ H min at this time, the electronic expansion valve 3 is not adjusted, and the outdoor fan 1 is adjusted.

[0084] Therefore, the heating and defrosting control method of the air conditioner provided by the embodiment of the present invention can accurately adjust the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 according to the detected temperature of the condenser when the air conditioner is in the heating mode, increase the temperature of the condenser, thereby delaying the frosting rate, reducing the defrosting times, improving the heating effect, helping to increase the average indoor temperature, reducing the temperature fluctuation, and thus improving the user experience.

[0085] According to the embodiment of the third aspect of the present invention, the present invention also provides an air conditioner, including the heating and defrosting control system of the air conditioner in the above embodiment, or when performing heating and defrosting, adopting the heating and defrosting control method of the air conditioner in the above embodiment.

[0086] The air conditioner provided by the embodiment of the present invention can increase the temperature of the condenser by adjusting the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 according to the detected temperature of the condenser when the air conditioner is in the heating mode, thereby delaying the frosting rate, reducing the defrosting times, improving the heating effect, helping to increase the average indoor temperature, reducing the temperature fluctuation, and thus improving the user experience.

[0087] Figure 3 Illustrates a schematic physical structure diagram of an electronic device, such as Figure 3As shown, the electronic device may include: a processor 11, a communications interface 12, a memory 13, and a communication bus 14. Among them, the processor 11, the communications interface 12, and the memory 13 complete mutual communication through the communication bus 14. The processor 11 may call the logical instructions in the memory 13 to execute the heating and defrosting control method of the air conditioner. The method includes: in response to the air conditioner being in the heating mode, detecting the temperature of the condenser of the outdoor unit; adjusting the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 based on the detected temperature of the condenser.

[0088] In addition, when the logical instructions in the above-mentioned memory 13 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0089] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the heating and defrosting control method of the air conditioner provided by the above-mentioned various methods. The method includes: in response to the air conditioner being in the heating mode, detecting the temperature of the condenser of the outdoor unit; adjusting the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 based on the detected temperature of the condenser.

[0090] On yet another hand, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the heating and defrosting control method of the air conditioner provided by the above-mentioned various methods. The method includes: in response to the air conditioner being in the heating mode, detecting the temperature of the condenser of the outdoor unit; adjusting the rotation speed of the outdoor fan 1 and the opening degree of the electronic expansion valve 3 based on the detected temperature of the condenser.

[0091] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0092] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements 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 heating and defrosting control system for an air conditioner, characterized in that, Comprising: Outdoor unit; Outdoor fan, disposed within the outdoor unit; First sensor, disposed on the condenser of the outdoor unit for detecting the temperature of the condenser; Electronic expansion valve, disposed between the condenser and the evaporator of the indoor unit; Controller, electrically connected to the first sensor, the outdoor fan, and the electronic expansion valve respectively, and the controller is configured to adjust the rotational speed of the outdoor fan and the opening degree of the electronic expansion valve based on the detected temperature of the condenser when the air conditioner is in the heating mode; The controller is configured to: when the detected temperature of the condenser is greater than the preset defrosting temperature and the difference between the detected temperature of the condenser and the preset defrosting temperature is smaller, control the rotational speed of the outdoor fan to be greater and the opening degree of the electronic expansion valve to be smaller; when the detected temperature of the condenser is less than or equal to the preset defrosting temperature, control the air conditioner to enter the defrosting mode; Preset defrosting temperature T a is the set value in the controller, and the preset defrosting temperature T a is related to the outdoor ambient temperature T ao The relationship between the two is as follows: T a = C × T ao - α; Among them, when T ao < 0 °C, C is 0.

8. When T ao ≥ 0 °C, C is 0.6; α is a fixed value.

2. The heating and defrosting control system of the air conditioner according to claim 1, characterized in that, Further comprising: First timer, electrically connected to the controller, for timing the continuous operation duration after the outdoor fan is adjusted to the target rotational speed value.

3. The heating and defrosting control system of the air conditioner according to claim 1, characterized in that, Further comprising: Second timer, electrically connected to the controller, for timing the continuous operation duration after the electronic expansion valve is adjusted to the target opening degree value.

4. The heating and defrosting control system of the air conditioner according to claim 1, characterized in that, Further comprising: Heating device, disposed on the condenser and electrically connected to the controller, for heating the condenser.

5. The heating and defrosting control system of the air conditioner according to claim 4, wherein The heating device is a heating wire, and the heating wire is spirally wound around the heat exchange coil of the condenser with a pitch.

6. The air conditioner heating and defrosting control system according to any one of claims 1-5, characterized in that, Further comprising: Second sensor, electrically connected to the electronic expansion valve and the controller respectively, for detecting the opening degree of the electronic expansion valve.

7. The heating and defrosting control system of the air conditioner according to any one of claims 1-5, characterized in that, Further comprising: Third sensor, disposed on the condenser and electrically connected to the controller, for detecting whether the condenser is frosted.

8. The heating and defrosting control system of the air conditioner according to claim 7, characterized in that, The third sensor is at least one of a camera and a radar.

9. A heating and defrosting control method for an air conditioner, used to control the heating and defrosting control system of the air conditioner described in any one of claims 1 to 8, characterized in that, Comprising: In response to the air conditioner being in the heating mode, detecting the temperature of the condenser of the outdoor unit; Adjusting the rotational speed of the outdoor fan and the opening degree of the electronic expansion valve based on the detected temperature of the condenser.

10. The air conditioner heating and defrosting control method according to claim 9, characterized in that, The step of adjusting the rotational speed of the outdoor fan and the opening degree of the electronic expansion valve based on the detected temperature of the condenser specifically includes: When the detected temperature of the condenser is greater than the preset defrosting temperature and the difference between the detected temperature of the condenser and the preset defrosting temperature is smaller, controlling the rotational speed of the outdoor fan to be greater and the opening degree of the electronic expansion valve to be smaller; When the detected temperature of the condenser is less than or equal to the preset defrosting temperature, controlling the air conditioner to enter the defrosting mode.

11. An air conditioner, characterized in that, Comprising the air conditioner heating and defrosting control system according to any one of claims 1-8, or when performing heating and defrosting, adopting the air conditioner heating and defrosting control method according to any one of claims 9-10 above.

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