A control method and device of an air conditioner, the air conditioner, a storage medium and a program product

Abstract

The application discloses a kind of air conditioner control method, device, air conditioner, storage medium and computer program product, air conditioner is provided with coil heat exchanger, coil heat exchanger has first refrigerant flow path and second refrigerant flow path, outdoor heat exchanger includes outer row heat exchanger and inner row heat exchanger;Outer row heat exchanger is connected with throttling component by first valve;The exhaust port of compressor is connected to the pipeline between outer row heat exchanger and first valve after first refrigerant flow path and second valve in turn;Second refrigerant flow path is located on the suction side pipeline of compressor;The method comprises: when air conditioner heating, according to the defrosting logic of air conditioner according to outdoor environment temperature;According to defrosting logic, the temperature of outdoor heat exchanger, the continuous running time length of compressor, control the opening and closure of first valve and second valve, the running speed of compressor.This scheme, by respectively defrosting outer row heat exchanger and inner row heat exchanger, make hot gas bypass refrigerant quantity and frost degree match, improve defrosting efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioner control method and device, an air conditioner, a storage medium and a computer program product. BACKGROUND

[0002] When the air conditioner is in heating operation, the air conditioner usually adopts a four-way valve reversing mode to defrost when the temperature of the outdoor heat exchanger reaches the defrosting temperature point. During the defrosting process, the air conditioner cannot provide heat for the indoor environment, resulting in a decrease in indoor comfort. Therefore, a related scheme is to use a hot gas bypass method to defrost, that is, high-temperature refrigerant is introduced into the outdoor heat exchanger to defrost. During this process, the bypassed high-temperature refrigerant will first exchange heat with the low-temperature refrigerant flowing out of the indoor heat exchanger, and then defrost the outdoor heat exchanger. Therefore, there is a certain defrosting delay, the defrosting efficiency is not high, the amount of refrigerant required for bypassing is large, and the amount of refrigerant used for indoor heating is reduced, resulting in poor heating effect.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The present application aims to provide an air conditioner control method and device, an air conditioner, a storage medium and a computer program product to solve the problem of low defrosting efficiency, large amount of refrigerant required for bypassing and poor heating effect when the air conditioner uses a hot gas bypass method to defrost in related schemes. The defrosting logic of the air conditioner is determined according to the outdoor environment temperature, and the outdoor exhaust heat exchanger and the outdoor return heat exchanger are defrosted in combination with the outdoor heat exchanger temperature and the continuous operation time of the compressor. The amount of refrigerant bypassed by the hot gas is matched with the frosting degree, the defrosting efficiency is improved, the excessive refrigerant bypassed by the hot gas is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0005] The application provides a control method of an air conditioner, the air conditioner comprising a compressor, an outdoor heat exchanger, a throttling component, a coil heat exchanger, a first valve and a second valve; the outdoor heat exchanger comprises an outer row heat exchanger and an inner row heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the inner row heat exchanger is connected with the throttling component; the outer row heat exchanger is connected with the throttling component through the first valve; the exhaust port of the compressor is connected to the pipeline between the outer row heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and the second valve; the second refrigerant flow path is located on the pipeline of the suction side of the compressor; the method comprises: when the air conditioner is in heating operation, the first valve is in an open state, the second valve is in a closed state, the outdoor environment temperature, the temperature of the outdoor heat exchanger and the continuous operation time length of the compressor are obtained; the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; the opening and closing of the first valve, the opening and closing of the second valve and the operation speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous operation time length of the compressor.

[0006] In some embodiments, the defrosting logic of the air conditioner comprises a first defrosting logic, a second defrosting logic and a third defrosting logic; the defrosting logic of the air conditioner is determined according to the outdoor environment temperature, which comprises judging the temperature range in which the outdoor environment temperature is located, including a first temperature range, a second temperature range and a third temperature range; the first temperature range > the second temperature range > the third temperature range; if the outdoor environment temperature is in the first temperature range, the defrosting logic of the air conditioner is determined as the first defrosting logic; if the outdoor environment temperature is in the second temperature range, the defrosting logic of the air conditioner is determined as the second defrosting logic; if the outdoor environment temperature is in the third temperature range, the defrosting logic of the air conditioner is determined as the third defrosting logic.

[0007] In some embodiments, the opening and closing of the first valve, the opening and closing of the second valve and the operation speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous operation time length of the compressor, which comprises: in the case that the defrosting logic of the air conditioner is the first defrosting logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature and whether the continuous operation time length of the compressor is greater than a preset first time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature or the continuous operation time length of the compressor is greater than the preset first time length, the second valve is opened and the first valve is closed to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset first stop temperature or the defrosting time is greater than a preset first stop time, the first valve is opened and the second valve is closed to end defrosting.

[0008] In some embodiments, according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor are controlled, and the method further comprises: in the case that the defrosting logic of the air conditioner is the second defrosting logic, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature, and determining whether the continuous running time length of the compressor is greater than a preset second time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous running time length of the compressor is greater than the preset second time length, the second valve is opened and the first valve is closed to start defrosting; and then, if the temperature of the outdoor heat exchanger is greater than a preset second stop temperature, or the defrosting time is greater than a preset second stop time, the first valve is opened and the second valve is closed to end defrosting.

[0009] In some embodiments, the method further comprises: after a preset first time of ending defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, the second valve is opened and the first valve is closed to start defrosting, and after a preset first ending time length, the second valve is closed and the first valve is opened to end defrosting; if the temperature of the outdoor heat exchanger is greater than the first preset temperature threshold, the second valve is opened and the first valve is closed to start defrosting, and after a preset second ending time length, the second valve is closed and the first valve is opened to end defrosting; the preset first ending time length > the preset second ending time length and / or,

[0010] After a preset second time of ending defrosting, it is determined whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, then under the second defrosting logic, when the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature, or the continuous running time length of the compressor is greater than a preset second time length, the first valve and the second valve are opened.

[0011] In some embodiments, according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor are controlled, and the method further comprises: in the case that the defrosting logic of the air conditioner is the third defrosting logic, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and determining whether the continuous running time length of the compressor is greater than a preset third time length; the preset first temperature > the preset second temperature > the preset third temperature; the preset first time length > the preset second time length > the preset third time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous running time length of the compressor is greater than the preset third time length, the first valve and the second valve are opened to start defrosting; and then, if the temperature of the outdoor heat exchanger is greater than a preset third stop temperature, or the defrosting time is greater than a preset third stop time, the second valve is closed to end defrosting; the preset first stop temperature > the preset second stop temperature > the preset third stop temperature; the preset first stop time < the preset second stop time < the preset third stop time.

[0012] In some embodiments, the method further comprises: after a preset third time of ending defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, the first valve and the second valve are opened to start defrosting, and the second valve is closed to end defrosting after a preset third ending time length; if the temperature of the outdoor heat exchanger is greater than the preset second temperature threshold, the first valve and the second valve are opened to start defrosting, and the second valve is closed to end defrosting after a preset fourth ending time length; the preset third ending time length > the preset fourth ending time length; and / or, after a preset fourth time of ending defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, then under the third defrosting logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous running time length of the compressor is greater than the preset third time length, the first valve and the second valve are opened, and the running speed of the compressor is increased.

[0013] According to the method, the application provides a control device of an air conditioner. The air conditioner comprises a compressor, an outdoor heat exchanger, a throttling component, a coil heat exchanger, a first valve and a second valve. The outdoor heat exchanger comprises an outer-row heat exchanger and an inner-row heat exchanger connected in parallel. The coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path. The inner-row heat exchanger is connected to the throttling component. The outer-row heat exchanger is connected to the throttling component through the first valve. An exhaust port of the compressor is connected to a pipeline between the outer-row heat exchanger and the first valve through the first refrigerant flow path and the second valve. The second refrigerant flow path is located on a pipeline of the compressor suction side. The device comprises an acquisition unit configured to acquire an outdoor environment temperature, a temperature of the outdoor heat exchanger and a continuous operation time of the compressor when the air conditioner is in a heating operation, the first valve is in an open state and the second valve is in a closed state. A control unit is configured to determine a defrosting logic of the air conditioner according to the outdoor environment temperature. The control unit is further configured to control opening and closing of the first valve, opening and closing of the second valve and an operation speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous operation time of the compressor.

[0014] In some embodiments, the defrosting logic of the air conditioner comprises a first defrosting logic, a second defrosting logic and a third defrosting logic. The control unit determines the defrosting logic of the air conditioner according to the outdoor environment temperature, which comprises judging a temperature range of the outdoor environment temperature, including a first temperature range, a second temperature range and a third temperature range, the first temperature range > the second temperature range > the third temperature range. If the outdoor environment temperature is in the first temperature range, the defrosting logic of the air conditioner is determined as the first defrosting logic. If the outdoor environment temperature is in the second temperature range, the defrosting logic of the air conditioner is determined as the second defrosting logic. If the outdoor environment temperature is in the third temperature range, the defrosting logic of the air conditioner is determined as the third defrosting logic.

[0015] In some embodiments, the control unit controls the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, and includes: in the case that the defrosting logic of the air conditioner is the first defrosting logic, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature and whether the continuous running time length of the compressor is greater than a preset first time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature or the continuous running time length of the compressor is greater than the preset first time length, opening the second valve and closing the first valve to start defrosting; and then, if the temperature of the outdoor heat exchanger is greater than a preset first stop temperature or the defrosting time is greater than a preset first stop time, opening the first valve and closing the second valve to end defrosting.

[0016] In some embodiments, the control unit controls the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, and further includes: in the case that the defrosting logic of the air conditioner is the second defrosting logic, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature and whether the continuous running time length of the compressor is greater than a preset second time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature or the continuous running time length of the compressor is greater than the preset second time length, opening the second valve and closing the first valve to start defrosting; and then, if the temperature of the outdoor heat exchanger is greater than a preset second stop temperature or the defrosting time is greater than a preset second stop time, opening the first valve and closing the second valve to end defrosting.

[0017] In some embodiments, the control unit is further configured to, after a preset first time after ending defrosting, determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, opening the second valve and closing the first valve to start defrosting, and closing the second valve and opening the first valve to end defrosting after a preset first ending time length; if the temperature of the outdoor heat exchanger is greater than the first preset temperature threshold, opening the second valve and closing the first valve to start defrosting, and closing the second valve and opening the first valve to end defrosting after a preset second ending time length; the preset first ending time length > the preset second ending time length and / or,

[0018] After a preset second time of ending defrosting, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, then the first valve and the second valve are opened under the second defrosting logic when the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature or the continuous running time of the compressor is greater than a preset second time length.

[0019] In some embodiments, the control unit, according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous running time of the compressor, controls the opening and closing of the first valve, the opening and closing of the second valve and the running speed of the compressor, and further comprises: in the case that the defrosting logic of the air conditioner is the third defrosting logic, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature and whether the continuous running time of the compressor is greater than a preset third time length; preset first temperature > preset second temperature > preset third temperature; preset first time length > preset second time length > preset third time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature or the continuous running time of the compressor is greater than the preset third time length, the first valve and the second valve are opened to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset third stop temperature or the defrosting time is greater than a preset third stop time, the second valve is closed to end defrosting; preset first stop temperature > preset second stop temperature > preset third stop temperature; preset first stop time < preset second stop time < preset third stop time.

[0020] In some embodiments, the control unit is further configured to, after a preset third time of ending defrosting, judge whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, the first valve and the second valve are opened to start defrosting and the second valve is closed to end defrosting after a preset third ending time length; if the temperature of the outdoor heat exchanger is greater than the preset second temperature threshold, the first valve and the second valve are opened to start defrosting and the second valve is closed to end defrosting after a preset fourth ending time length; preset third ending time length > preset fourth ending time length; and / or, after a preset fourth time of ending defrosting, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, then the first valve and the second valve are opened and the running speed of the compressor is increased under the third defrosting logic when the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature or the continuous running time of the compressor is greater than a preset third time length.

[0021] To match the above device, the present application provides an air conditioner in another aspect, comprising: the above-mentioned air conditioner control device.

[0022] To match the above method, the present application provides a storage medium in another aspect, comprising a stored program, wherein the device where the storage medium is located executes the above-mentioned air conditioner control method when the program runs.

[0023] To match the above method, the present application provides a computer program product in another aspect, comprising a computer program, which realizes the steps of the above-mentioned air conditioner control method when the computer program product is processed.

[0024] The scheme of the present application, the air conditioner is provided with a coil heat exchanger, the coil heat exchanger has first refrigerant flow path and second refrigerant flow path, the outdoor heat exchanger includes the outer row heat exchanger and the inner row heat exchanger in parallel arrangement, the inner row heat exchanger is connected with the throttling component, the outer row heat exchanger is connected with the throttling component through the first valve, the exhaust port of the compressor is connected to the pipeline between the outer row heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and the second valve, and the second refrigerant flow path is located on the compressor suction side pipeline;When the air conditioner is in heating operation, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature;According to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous running time of the compressor, the opening and closing of the first valve and the second valve and the running speed of the compressor are controlled.From the defrosting logic of the air conditioner not stopping according to the outdoor environment temperature, the outdoor outer row heat exchanger and the outdoor inner row heat exchanger are defrosted in combination with the temperature of the outdoor heat exchanger and the continuous running time of the compressor, so that the amount of hot gas bypassing refrigerant is matched with the frost degree, the defrosting efficiency is improved, and at the same time, the excessive hot gas bypassing refrigerant is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0025] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood by those skilled in the art from the description.

[0026] The technical scheme of the present application will be further described in detail below by means of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the flowchart of an embodiment of the control method of the air conditioner of the present application;

[0028] Figure 2 It is the structural schematic diagram of an embodiment of the control device of the air conditioner of the present application;

[0029] Figure 3 It is the system structure diagram of the air conditioner of the present application;

[0030] Figure 4Structure diagram of the coil heat exchanger in the air conditioner of the present application;

[0031] Figure 5 Flowchart of the defrosting control method of the air conditioner of the present application.

[0032] In the embodiments of the present application, the reference signs in the drawings are as follows:

[0033] 1-compressor; 2-four-way valve; 3-indoor heat exchanger; 4-indoor fan; 5-throttling component; 6-first valve; 7-second valve; 8-coil heat exchanger; 9-outdoor fan; 10-outdoor indoor discharge heat exchanger; 11-outdoor outdoor discharge heat exchanger; 12-first refrigerant inlet; 13-first refrigerant outlet; 14-second refrigerant inlet; 15-second refrigerant outlet; 102-acquiring unit; 104-control unit. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] According to an embodiment of the present application, a control method of an air conditioner is provided, the air conditioner comprising a compressor, an outdoor heat exchanger, a throttling component, a coil heat exchanger, a first valve and a second valve; the outdoor heat exchanger comprising an outdoor discharge heat exchanger and an indoor discharge heat exchanger arranged in parallel; the coil heat exchanger having a first refrigerant flow path and a second refrigerant flow path; the indoor discharge heat exchanger being connected to the throttling component; the outdoor discharge heat exchanger being connected to the throttling component through the first valve; an exhaust port of the compressor being connected to a pipeline between the outdoor discharge heat exchanger and the first valve in sequence after passing through the first refrigerant flow path and the second valve; and the second refrigerant flow path being located on a pipeline on the suction side of the compressor.

[0036] The specific structure of the air conditioner is as follows Figure 3As shown, in normal cooling or heating mode, the first valve 6 is normally open, and the second valve 7 is normally closed. In heating mode, the refrigerant discharged from the exhaust port of compressor 1 passes through the four-way valve 2, indoor heat exchanger 3, throttling component 5, outdoor heat exchanger (outdoor internal heat exchanger 10, outdoor external heat exchanger 11, and first valve 6), four-way valve 2, and the second refrigerant flow path of the coil heat exchanger 8 before returning to the intake port of compressor 1. At this time, the coil heat exchanger 8 acts as a liquid accumulator, capable of storing liquid refrigerant. In cooling mode, the refrigerant discharged from the exhaust port of compressor 1 passes through the four-way valve 2, outdoor heat exchanger (outdoor internal heat exchanger 10, outdoor external heat exchanger 11, and first valve 6), throttling component 5, indoor heat exchanger 3, four-way valve 2, and the second refrigerant flow path of the coil heat exchanger 8 before returning to the intake port of compressor 1. At this time, the coil heat exchanger 8 acts as a liquid accumulator, capable of storing liquid refrigerant.

[0037] In heating mode, if the second valve 7 is opened, part of the refrigerant discharged from the compressor 1 passes through the first refrigerant flow path of the coil heat exchanger 8. In the coil heat exchanger 8, the high-temperature refrigerant in the first refrigerant flow path exchanges heat with the low-temperature refrigerant in the second refrigerant flow path, causing the liquid refrigerant to heat up and gasify, increasing the system refrigerant volume, improving the system heating capacity and defrosting efficiency, and preventing the liquid refrigerant from flowing into the compressor and affecting the compressor operation. The specific structure of the coil heat exchanger 8 is as follows: Figure 4 As shown, the first refrigerant inlet 12 and the first refrigerant outlet 13 are connected to form a first refrigerant flow path. The first refrigerant inlet 12 is connected to the exhaust port of the compressor 1, and the first refrigerant outlet 13 is connected to the second valve 7. The second refrigerant inlet 14 and the second refrigerant outlet 15 are connected to form a second refrigerant flow path. Inside the coil heat exchanger 8, the port of the second refrigerant inlet 14 is below the liquid level line, and the second refrigerant outlet 15 is above the liquid level line, so that the coil heat exchanger 8 has a liquid storage function. The second refrigerant inlet 14 is connected to the four-way valve, and the second refrigerant outlet 15 is connected to the suction port of the compressor 1.

[0038] like Figure 1 FIG. 1 is a flow chart of an embodiment of the method of the present invention. The air conditioner control method may include steps S110 to S130.

[0039] In step S110, when the air conditioner is in heating mode, the first valve is open and the second valve is closed, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor are obtained. The temperature of the outdoor heat exchanger includes the temperature of the external heat exchanger and the temperature of the internal heat exchanger.

[0040] In step S120 , the defrost logic of the air conditioner is determined according to the outdoor ambient temperature.

[0041] The defrosting judgment is started 5 minutes after the air conditioner is started to heat. First, different defrosting logics are determined according to the outdoor environment temperature. Different outdoor environment temperatures correspond to different working conditions, and the frosting degree of the air conditioner is different in each working condition, so that the defrosting logic executed during defrosting is different, so that the defrosting capacity is matched with the current frosting degree, and the situation that the defrosting is insufficient and the hot gas bypassing refrigerant quantity is excessive to affect the air conditioner heating is avoided.

[0042] In some embodiments, the defrosting logic of the air conditioner includes: a first defrosting logic, a second defrosting logic, and a third defrosting logic. In step S120, the specific process of determining the defrosting logic of the air conditioner according to the outdoor environment temperature includes: judging the temperature range in which the outdoor environment temperature is located, including a first temperature range, a second temperature range, and a third temperature; the first temperature range > the second temperature range > the third temperature range; if the outdoor environment temperature is in the first temperature range, the defrosting logic of the air conditioner is determined to be the first defrosting logic; if the outdoor environment temperature is in the second temperature range, the defrosting logic of the air conditioner is determined to be the second defrosting logic; and if the outdoor environment temperature is in the third temperature range, the defrosting logic of the air conditioner is determined to be the third defrosting logic.

[0043] The temperature range is used to judge the frosting degree of the outdoor heat exchanger. The lower the outdoor environment temperature, the more serious the frosting degree of the outdoor heat exchanger. The first temperature range can be set to a range greater than 2°C, corresponding to a light working condition of the air conditioner, and the first defrosting logic is used for defrosting in the light working condition. The second temperature range can be set to -4°C~2°C, corresponding to a medium working condition of the air conditioner, and the second defrosting logic is used for defrosting in the medium working condition. The third temperature range can be set to a range less than -4°C, corresponding to a heavy working condition of the air conditioner, and the third defrosting logic is used for defrosting in the heavy working condition. By using different defrosting logics according to different outdoor environment temperatures, the defrosting efficiency can be improved, the refrigerant quantity of the hot gas bypassing can meet the current demand, and the situation that the refrigerant quantity of the hot gas bypassing is insufficient to cause incomplete defrosting or the refrigerant quantity of the hot gas bypassing is excessive to affect heating is avoided.

[0044] In step S130, the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time of the compressor.

[0045] The system is provided with three defrosting modes to control the opening and closing of the first valve and the second valve and the running speed of the compressor. Each defrosting mode has a different control method, so the defrosting efficiency is different. In the normal heating process, the first valve is in an open state and the second valve is in a closed state. The three defrosting modes include:

[0046] Defrosting mode one: open the second electromagnetic valve and close the first electromagnetic valve.

[0047] Defrosting mode two: open the first electromagnetic valve and the second electromagnetic valve.

[0048] Defrosting mode three: open the first electromagnetic valve and the second electromagnetic valve, and increase the running speed of the compressor.

[0049] The defrosting mode one, the defrosting mode two and the defrosting mode three are all in the case of not stopping the air conditioner, that is, the air conditioner is still in the heating mode during the defrosting process, and can continuously provide heat for the indoor.

[0050] Compared with the outdoor inner discharge heat exchanger 10, the outdoor outer discharge heat exchanger 11 is more likely to frost. Therefore, in the defrosting mode, the first electromagnetic valve is closed, and the low-temperature refrigerant flowing from the indoor side to the outdoor side will not flow to the outdoor outer discharge heat exchanger 11; at this time, the high-temperature refrigerant discharged from the compressor 1 flows into the outdoor outer discharge heat exchanger 11 after passing through the coil heat exchanger 8 and the second electromagnetic valve 7, and defrosts the outdoor outer discharge heat exchanger 11.

[0051] In the defrosting mode two, the refrigerant flowing into the outdoor outer discharge heat exchanger 11 is only the high-temperature refrigerant discharged from the compressor 1, and the refrigerant flowing into the outdoor inner discharge heat exchanger 10 includes the high-temperature refrigerant discharged from the compressor 1 and the low-temperature refrigerant flowing out of the throttling component. Since the frost degree of the outdoor outer discharge heat exchanger 11 is relatively more serious than that of the outdoor inner discharge heat exchanger 10, the amount of hot gas bypassing refrigerant can be distinguished according to different frost degrees in the defrosting mode, the defrosting efficiency is improved, and the heat waste of the hot gas bypassing refrigerant is avoided.

[0052] In the defrosting mode three, not only the first electromagnetic valve and the second electromagnetic valve are opened, but also the running speed of the compressor is increased, the flow of the hot gas bypassing refrigerant is increased, the temperature at the outdoor heat exchanger is further increased, and the defrosting is ensured to be complete.

[0053] In some embodiments, in step S130, according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the specific process of controlling the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor includes: in the case that the defrosting logic of the air conditioner is the first defrosting logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature, and judging whether the continuous running time length of the compressor is greater than a preset first time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous running time length of the compressor is greater than the preset first time length, the second valve is opened and the first valve is closed to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset first stop temperature, or the defrosting time is greater than a preset first stop time, the first valve is opened and the second valve is closed to end the defrosting.

[0054] In the first defrosting logic, the outdoor temperature is relatively high, and it is considered that only the outdoor outdoor exhaust heat exchanger needs to be defrosted, and the outdoor indoor exhaust heat exchanger does not need to be defrosted. The preset first temperature can be set to -2°C, and the preset first time length can be set to 60 minutes. When the temperature of the outdoor heat exchanger is ≤-2°C, or the continuous running time length of the compressor is >60 minutes, the air conditioner starts to defrost, and the opening and closing of the first valve and the second valve are controlled in the defrosting mode one, that is, the second valve is opened and the first valve is closed. The preset first stop temperature can be set to 10°C, and the preset first stop time can be set to 5 minutes. During the defrosting process, if the temperature of the outdoor heat exchanger is >10°C, or the defrosting time is >5 minutes, the defrosting is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0055] In some embodiments, in step S130, according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the specific process of controlling the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor further includes: in the case that the defrosting logic of the air conditioner is the second defrosting logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature, and judging whether the continuous running time length of the compressor is greater than a preset second time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous running time length of the compressor is greater than the preset second time length, the second valve is opened and the first valve is closed to start defrosting; and then, if the temperature of the outdoor heat exchanger is greater than a preset second stop temperature, or the defrosting time is greater than a preset second stop time, the first valve is opened and the second valve is closed to end the defrosting.

[0056] In the second defrosting logic, the outdoor temperature is relatively low, and it is considered that the outdoor outdoor exhaust heat exchanger and the outdoor indoor exhaust heat exchanger both need to be defrosted. The preset second temperature can be set to -6°C, and the preset second time length can be set to 45 minutes. When the temperature of the outdoor heat exchanger is < -2°C, or the continuous running time length of the compressor is >45 minutes, the air conditioner starts to defrost, and the opening and closing of the first valve and the second valve are controlled in the defrosting mode one, that is, the second valve is opened and the first valve is closed. The preset second stop temperature can be set to 6°C, and the preset second stop time can be set to 8 minutes. During the defrosting process, if the temperature of the outdoor heat exchanger is >6°C, or the defrosting time is >8 minutes, the defrosting is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0057] In some embodiments, the process of inhibiting frost formation under the second defrosting logic further comprises: after the preset first time of ending defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, opening the second valve and closing the first valve to start defrosting, and closing the second valve and opening the first valve to end defrosting after a preset first ending duration; if the temperature of the outdoor heat exchanger is greater than the preset first temperature threshold, opening the second valve and closing the first valve to start defrosting, and closing the second valve and opening the first valve to end defrosting after a preset second ending duration; the preset first ending duration > the preset second ending duration.

[0058] Under the second defrosting logic, after each ending of defrosting, the air conditioner enters the frost inhibition stage to prevent the outdoor heat exchanger from frosting again. The preset first time can be set to 8 min, the preset temperature threshold can be set to -2℃, the preset first ending duration can be set to 1 min, and the preset second ending duration can be set to 0.5 min. After 8 min of ending defrosting each time, if the temperature of the outdoor heat exchanger is ≤-2℃, the air conditioner runs in the defrosting mode for 1 min; if the temperature of the outdoor heat exchanger is >-2℃, the air conditioner runs in the defrosting mode for 0.5 min. By defrosting for a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0059] In some embodiments, the process of switching defrosting mode under the second defrosting logic further comprises: after a preset second time of ending defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, then under the second defrosting logic, the first valve and the second valve are opened when the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature or the continuous running duration of the compressor is greater than a preset second duration.

[0060] Under the second defrosting logic, if defrosting in the defrosting mode one cannot guarantee the defrosting effect, then under the second defrosting logic, the defrosting mode one is replaced by the defrosting mode two for defrosting. Specifically, the preset second time can be set to 10 min, and the preset first temperature threshold can be set to -2℃. After 10 min of defrosting, if the temperature of the outdoor heat exchanger is ≤-2℃, then under the second defrosting logic, the first valve and the second valve are opened according to the defrosting mode two, i.e., the first valve and the second valve are opened. By using the step coverage defrosting mode, the defrosting mode is automatically switched, the defrosting mode with better defrosting effect is used for defrosting, and better defrosting effect is guaranteed.

[0061] In some embodiments, in step S130, according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the specific process of controlling the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor further comprises: in the case that the defrosting logic of the air conditioner is the third defrosting logic, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and determining whether the continuous running time length of the compressor is greater than a preset third time length; the preset first temperature > the preset second temperature > the preset third temperature; the preset first time length > the preset second time length > the preset third time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous running time length of the compressor is greater than the preset third time length, the first valve and the second valve are opened to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset third stop temperature, or the defrosting time is greater than a preset third stop time, the second valve is closed to end defrosting; the preset first stop temperature > the preset second stop temperature > the preset third stop temperature; the preset first stop time < the preset second stop time < the preset third stop time.

[0062] In the third defrosting logic, the outdoor temperature is very low, and it is considered that both the outdoor outdoor heat exchanger and the outdoor indoor heat exchanger need to be defrosted. The preset third temperature can be set to -10°C, and the preset third time length can be set to 30 min. When the temperature of the outdoor heat exchanger is < -10°C, or the continuous running time length of the compressor is > 30 min, the air conditioner starts to defrost, and the opening and closing of the first valve and the second valve are controlled in the second defrosting mode, that is, the second valve and the first valve are opened. The preset third stop temperature can be set to 4°C, and the preset third stop time can be set to 12 min. During the defrosting process, if the temperature of the outdoor heat exchanger is > 4°C, or the defrosting time is > 12 min, the defrosting is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0063] In some embodiments, the process of inhibiting frosting under the third defrosting logic further comprises: after the preset third time of ending defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, opening the first valve and the second valve to start defrosting, and closing the second valve to end defrosting after a preset third ending time length; if the temperature of the outdoor heat exchanger is greater than the preset second temperature threshold, opening the first valve and the second valve to start defrosting, and closing the second valve to end defrosting after a preset fourth ending time length; the preset third ending time length > the preset fourth ending time length.

[0064] In the third defrosting logic, after each defrosting, the air conditioner enters the frost inhibition stage to prevent the outdoor heat exchanger from frosting again. The preset third time can be set to 5 min, the preset second temperature threshold can be set to -6℃, the preset third end time can be set to 1.5 min, and the preset fourth end time can be set to 1 min. After 5 min of each defrosting, if the outdoor heat exchanger temperature is ≤-6℃, the air conditioner runs in the second defrosting mode for 1.5 min; if the outdoor heat exchanger temperature is >-6℃, the air conditioner runs in the second defrosting mode for 1 min. By defrosting for a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0065] In some embodiments, the process of switching the defrosting mode under the third defrosting logic further includes: after the preset fourth time of defrosting, determining whether the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, then under the third defrosting logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous running time of the compressor is greater than the preset third time, the first valve and the second valve are opened, and the running speed of the compressor is increased.

[0066] Under the third defrosting logic, if defrosting in the second defrosting mode cannot guarantee the defrosting effect, then under the third defrosting logic, the second defrosting mode is replaced by the third defrosting mode for defrosting. Specifically, the preset fourth time can be set to 10 min, and the preset second temperature threshold can be set to -6℃. After 10 min of defrosting, if the outdoor heat exchanger temperature is ≤-6℃, then under the third defrosting logic, the valve opening and closing are controlled according to the third defrosting mode, i.e., the first valve and the second valve are opened, and the running speed of the compressor is increased. By using the step coverage defrosting mode, the defrosting mode is automatically switched, the defrosting mode with better defrosting effect is used for defrosting, and better defrosting effect is guaranteed.

[0067] Figure 5 The flowchart of the defrosting control method of the air conditioner of the present application is shown in Figure 5 , which includes:

[0068] Step 1: 5 min after the air conditioner heating is turned on, determine the size of the outdoor environment temperature T1. If T1 > 2℃, execute step 2; if 2℃ ≥ T1 ≥ -4℃, execute step 3; if T1 < -4℃, execute step 4.

[0069] Step 2, judge whether the outdoor heat exchanger temperature T2≤-2℃, or whether the compressor continuous running time t1>60min. If T2≤-2℃, or t1>60min, then execute defrosting mode one (open the second electromagnetic valve, close the first electromagnetic valve) to defrost. During the defrosting process, if T2>10℃ or the defrosting time t2>5min, then end the defrosting. After 10min of ending the defrosting, re-execute step 2.

[0070] Step 3, judge whether the outdoor heat exchanger temperature T2≤-6℃, or whether the compressor continuous running time t1>45min. If T2≤-6℃, or t1>45min, then execute defrosting mode one to defrost. During the defrosting process, if T2>6℃ or the defrosting time t2>8min, then end the defrosting. After ending the defrosting, execute step 3.1 and step 3.2 respectively.

[0071] Step 3.1, after 8min of ending the defrosting, if T2≤-2℃, then execute defrosting mode one and last for 1min; if T2>-2℃, then execute defrosting mode one and last for 0.5min.

[0072] Step 3.2, after 10min of ending the defrosting, if T2≤-2℃, then after executing step 3 and step 3.1, replace the defrosting mode one with defrosting mode two (open the first electromagnetic valve and the second electromagnetic valve).

[0073] Step 4, judge whether the outdoor heat exchanger temperature T2≤-10℃, or whether the compressor continuous running time t1>30min. If T2≤-10℃, or t1>30min, then execute defrosting mode two to defrost. During the defrosting process, if T2>4℃ or the defrosting time t2>12min, then end the defrosting. After ending the defrosting, execute step 4.1 and step 4.2 respectively.

[0074] Step 4.1, after 5min of ending the defrosting, if T2≤-6℃, then execute defrosting mode two and last for 1.5min; if T2>-2℃, then execute defrosting mode two and last for 1min.

[0075] Step 4.2, after 10min of ending the defrosting, if T2≤-6℃, then after executing step 4 and step 4.1, replace the defrosting mode two with defrosting mode three (open the first electromagnetic valve and the second electromagnetic valve, increase the running speed of the compressor).

[0076] According to the technical scheme of the embodiment, the air conditioner is provided with a coil heat exchanger, the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path, the outdoor heat exchanger includes an outer discharge heat exchanger and an inner discharge heat exchanger which are arranged in parallel, the inner discharge heat exchanger is connected to the throttling component, the outer discharge heat exchanger is connected to the throttling component through the first valve, the discharge port of the compressor is connected to the pipeline between the outer discharge heat exchanger and the first valve in sequence after passing through the first refrigerant flow path and the second valve, and the second refrigerant flow path is located on the suction side pipeline of the compressor; when the air conditioner is in a heating operation mode, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; and the opening and closing of the first valve and the second valve and the operation speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous operation time of the compressor. Therefore, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature, the outdoor outer discharge heat exchanger and the outdoor inner discharge heat exchanger are defrosted according to the temperature of the outdoor heat exchanger and the continuous operation time of the compressor, the amount of hot gas bypass refrigerant is matched with the frost degree, the defrosting efficiency is improved, the excessive hot gas bypass refrigerant is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0077] According to the embodiment of the application, a control device of an air conditioner corresponding to a control method of the air conditioner is also provided. The air conditioner includes a compressor, an outdoor heat exchanger, a throttling component, a coil heat exchanger, a first valve and a second valve. The outdoor heat exchanger includes an outer discharge heat exchanger and an inner discharge heat exchanger which are arranged in parallel. The coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path. The inner discharge heat exchanger is connected to the throttling component. The outer discharge heat exchanger is connected to the throttling component through the first valve. The discharge port of the compressor is connected to the pipeline between the outer discharge heat exchanger and the first valve in sequence after passing through the first refrigerant flow path and the second valve. The second refrigerant flow path is located on the suction side pipeline of the compressor.

[0078] The specific structure of the air conditioner is shown in Figure 3 The first valve 6 is in an open state and the second valve 7 is in a closed state in a normal refrigeration or heating state of the air conditioner. In the heating mode, the refrigerant discharged from the discharge port of the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, the throttling component 5, the outdoor heat exchanger (the outdoor inner discharge heat exchanger 10 and the outdoor outer discharge heat exchanger 11 and the first valve 6), the four-way valve 2 and the second refrigerant flow path of the coil heat exchanger 8 in sequence and then returns to the suction port of the compressor 1. At this time, the coil heat exchanger 8 functions as a liquid accumulator and can store liquid refrigerant. In the refrigeration mode, the refrigerant discharged from the discharge port of the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger (the outdoor inner discharge heat exchanger 10 and the outdoor outer discharge heat exchanger 11 and the first valve 6), the throttling component 5, the indoor heat exchanger 3, the four-way valve 2 and the second refrigerant flow path of the coil heat exchanger 8 in sequence and then returns to the suction port of the compressor 1. At this time, the coil heat exchanger 8 functions as a liquid accumulator and can store liquid refrigerant.

[0079] In the heating mode, if the second valve 7 is opened, part of the refrigerant discharged by the compressor 1 passes through the first refrigerant flow path of the coil heat exchanger 8. In the coil heat exchanger 8, the high-temperature refrigerant in the first refrigerant flow path exchanges heat with the low-temperature refrigerant in the second refrigerant flow path, so that the liquid refrigerant is warmed and gasified, the system refrigerant amount is increased, the system heating capacity and defrosting efficiency are improved, and the liquid refrigerant is prevented from flowing into the compressor to affect the operation of the compressor. The specific structure of the coil heat exchanger 8 is shown in Figure 4 The first refrigerant inlet 12 and the first refrigerant outlet 13 are connected to form the first refrigerant flow path. The first refrigerant inlet 12 is connected to the exhaust port of the compressor 1, and the first refrigerant outlet 13 is connected to the second valve 7. The second refrigerant inlet 14 and the second refrigerant outlet 15 are connected to form the second refrigerant flow path. In the interior of the coil heat exchanger 8, the port of the second refrigerant inlet 14 is below the liquid level line, and the second refrigerant outlet 15 is above the liquid level line, so that the coil heat exchanger 8 has a liquid storage function. The second refrigerant inlet 14 is connected to the four-way valve, and the second refrigerant outlet 15 is connected to the suction port of the compressor 1.

[0080] Referring to Figure 2 The control device of the air conditioner can include an acquisition unit 102 and a control unit 104.

[0081] The acquisition unit 102 is configured to acquire the outdoor environment temperature, the temperature of the outdoor heat exchanger, and the continuous running time of the compressor when the air conditioner is in the heating operation, the first valve is in the open state, and the second valve is in the closed state. The temperature of the outdoor heat exchanger includes the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger. The specific functions and processes of the acquisition unit 102 are described in step S110.

[0082] The control unit 104 is configured to determine the defrosting logic of the air conditioner according to the outdoor environment temperature. The specific functions and processes of the control unit 104 are described in step S120.

[0083] The defrosting judgment is started 5 minutes after the air conditioner is started in the heating mode. First, different defrosting logics are determined according to the outdoor environment temperature. Different outdoor environment temperatures correspond to different working conditions, and the frosting degree of the air conditioner is different in each working condition, so that different defrosting logics are executed during defrosting, so that the defrosting capacity is matched with the current frosting degree, and the situation that the defrosting is insufficient and the air conditioner is frequently defrosted, and the refrigerant amount of the hot gas bypass is too large to affect the heating of the air conditioner is avoided.

[0084] In some embodiments, the defrosting logic of the air conditioner comprises: a first defrosting logic, a second defrosting logic, and a third defrosting logic. The control unit 104 determines the specific process of the defrosting logic of the air conditioner according to the outdoor ambient temperature, which comprises: determining the temperature range in which the outdoor ambient temperature is located, including a first temperature range, a second temperature range, and a third temperature; the first temperature range > the second temperature range > the third temperature range; if the outdoor ambient temperature is in the first temperature range, the defrosting logic of the air conditioner is determined to be the first defrosting logic; if the outdoor ambient temperature is in the second temperature range, the defrosting logic of the air conditioner is determined to be the second defrosting logic; and if the outdoor ambient temperature is in the third temperature range, the defrosting logic of the air conditioner is determined to be the third defrosting logic.

[0085] The temperature range is used to determine the degree of frosting of the outdoor heat exchanger. The lower the outdoor ambient temperature, the more serious the degree of frosting of the outdoor heat exchanger. The first temperature range can be set to a range greater than 2℃, corresponding to a light working condition of the air conditioner, and the first defrosting logic is used for defrosting in the light working condition. The second temperature range can be set to -4℃-2℃, corresponding to a medium working condition of the air conditioner, and the second defrosting logic is used for defrosting in the medium working condition. The third temperature range can be set to a range less than -4℃, corresponding to a heavy working condition of the air conditioner, and the third defrosting logic is used for defrosting in the heavy working condition. By using different defrosting logics according to different outdoor ambient temperatures, the defrosting efficiency can be improved, the amount of hot gas bypass refrigerant can meet the current demand, and the situation of incomplete defrosting due to insufficient hot gas bypass refrigerant and the situation of affecting heating due to excessive hot gas bypass refrigerant can be avoided.

[0086] The control unit 104 is also configured to control the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operating time of the compressor. For specific functions and processes of the control unit 104, see step S130.

[0087] The system is pre-set with three defrosting modes to control the opening and closing of the first valve and the second valve and the operating speed of the compressor. Each defrosting mode has a different control method, and thus has a different defrosting efficiency. In the normal heating process, the first valve is in an open state and the second valve is in a closed state. The three defrosting modes include:

[0088] Defrosting mode one: open the second electromagnetic valve and close the first electromagnetic valve.

[0089] Defrosting mode two: open the first electromagnetic valve and the second electromagnetic valve.

[0090] Defrosting mode three: open the first electromagnetic valve and the second electromagnetic valve, and increase the operating speed of the compressor.

[0091] The defrosting mode one, the defrosting mode two and the defrosting mode three are all in the case of not stopping the air conditioner, that is, the air conditioner is still in the heating mode during the defrosting process, and can continuously provide heat for the indoor.

[0092] Compared with the outdoor indoor discharge heat exchanger 10, the outdoor outdoor discharge heat exchanger 11 is more likely to frost. Therefore, in the defrosting mode, the first electromagnetic valve is closed, and the low-temperature refrigerant flowing from the indoor side to the outdoor side will not flow to the outdoor outdoor discharge heat exchanger 11; at this time, the high-temperature refrigerant discharged from the compressor 1 flows into the outdoor outdoor discharge heat exchanger 11 after passing through the coil heat exchanger 8 and the second electromagnetic valve 7, and defrosts the outdoor outdoor discharge heat exchanger 11.

[0093] In the defrosting mode two, the refrigerant flowing into the outdoor outdoor discharge heat exchanger 11 is only the high-temperature refrigerant discharged from the compressor 1, and the refrigerant flowing into the outdoor indoor discharge heat exchanger 10 includes the high-temperature refrigerant discharged from the compressor 1 and the low-temperature refrigerant flowing from the throttling component. Since the frost degree of the outdoor outdoor discharge heat exchanger 11 is relatively more serious than that of the outdoor indoor discharge heat exchanger 10, the amount of hot gas bypass refrigerant can be distinguished according to different frost degrees in the defrosting mode, the defrosting efficiency is improved, and the waste of heat of the hot gas bypass refrigerant is avoided.

[0094] In the defrosting mode three, not only the first electromagnetic valve and the second electromagnetic valve are opened, but also the operating speed of the compressor is increased, the flow of the hot gas bypass refrigerant is increased, and the temperature at the outdoor heat exchanger is further increased to ensure that the defrosting is complete.

[0095] In some embodiments, the control unit 104 controls the specific process of the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operating time length of the compressor, which includes: in the case that the defrosting logic of the air conditioner is the first defrosting logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature and whether the continuous operating time length of the compressor is greater than a preset first time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operating time length of the compressor is greater than the preset first time length, the second valve is opened and the first valve is closed to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset first stop temperature, or the defrosting time is greater than a preset first stop time, the first valve is opened and the second valve is closed to end the defrosting.

[0096] In the first defrosting logic, the outdoor temperature is relatively high, and it is considered that only the outdoor outdoor exhaust heat exchanger needs to be defrosted, and the outdoor indoor exhaust heat exchanger does not need to be defrosted. The preset first temperature can be set to -2°C, and the preset first time length can be set to 60 minutes. When the temperature of the outdoor heat exchanger is ≤-2°C, or the continuous running time length of the compressor is >60 minutes, the air conditioner starts to defrost, and the opening and closing of the first valve and the second valve are controlled in the defrosting mode one, that is, the second valve is opened and the first valve is closed. The preset first stop temperature can be set to 10°C, and the preset first stop time can be set to 5 minutes. During the defrosting process, if the temperature of the outdoor heat exchanger is >10°C, or the defrosting time is >5 minutes, the defrosting is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0097] In some embodiments, the control unit 104 controls the specific process of the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor. In the case where the defrosting logic of the air conditioner is the second defrosting logic, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature, and whether the continuous running time length of the compressor is greater than a preset second time length. If the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous running time length of the compressor is greater than the preset second time length, the second valve is opened and the first valve is closed to start defrosting. Then, if the temperature of the outdoor heat exchanger is greater than a preset second stop temperature, or the defrosting time is greater than a preset second stop time, the first valve is opened and the second valve is closed to end the defrosting.

[0098] In the second defrosting logic, the outdoor temperature is relatively low, and it is considered that the outdoor outdoor exhaust heat exchanger and the outdoor indoor exhaust heat exchanger both need to be defrosted. The preset second temperature can be set to -6°C, and the preset second time length can be set to 45 minutes. When the temperature of the outdoor heat exchanger is < -2°C, or the continuous running time length of the compressor is >45 minutes, the air conditioner starts to defrost, and the opening and closing of the first valve and the second valve are controlled in the defrosting mode one, that is, the second valve is opened and the first valve is closed. The preset second stop temperature can be set to 6°C, and the preset second stop time can be set to 8 minutes. During the defrosting process, if the temperature of the outdoor heat exchanger is >6°C, or the defrosting time is >8 minutes, the defrosting is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0099] In some embodiments, the control unit 104 is further configured to: after a preset first time of ending defrosting, determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, open the second valve and close the first valve to start defrosting, and close the second valve and open the first valve to end defrosting after a preset first ending duration; if the temperature of the outdoor heat exchanger is greater than the first preset temperature threshold, open the second valve and close the first valve to start defrosting, and close the second valve and open the first valve to end defrosting after a preset second ending duration; the preset first ending duration > the preset second ending duration.

[0100] Under the second defrosting logic, after each time of ending defrosting, the air conditioner enters a frost inhibition stage to prevent the outdoor heat exchanger from frosting again. The preset first time can be set to 8 min, the preset temperature threshold can be set to -2°C, the preset first ending duration can be set to 1 min, and the preset second ending duration can be set to 0.5 min. After 8 min of ending defrosting each time, if the temperature of the outdoor heat exchanger is ≤ -2°C, the air conditioner runs the defrosting mode for 1 min; if the temperature of the outdoor heat exchanger is > -2°C, the air conditioner runs the defrosting mode for 0.5 min. By defrosting for a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0101] In some embodiments, the control unit 104 is further configured to: after a preset second time of ending defrosting, determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, then under the second defrosting logic, open the first valve and the second valve when the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature or the continuous running duration of the compressor is greater than a preset second duration.

[0102] Under the second defrosting logic, if defrosting in the defrosting mode one cannot guarantee the defrosting effect, then under the second defrosting logic, the defrosting mode one is replaced by the defrosting mode two for defrosting. Specifically, the preset second time can be set to 10 min, and the preset first temperature threshold can be set to -2°C. After 10 min of frosting defrosting, if the temperature of the outdoor heat exchanger is ≤ -2°C, then under the second defrosting logic, the first valve and the second valve are opened according to the defrosting mode two, i.e., the first valve and the second valve are opened. By using the step coverage defrosting mode, automatically switching the defrosting mode, and using the defrosting mode with better defrosting effect for defrosting, a better defrosting effect is guaranteed.

[0103] In some embodiments, the control unit 104 controls the opening and closing of the first valve, the opening and closing of the second valve, and the specific process of the operating speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operating time length of the compressor. In the case that the defrosting logic of the air conditioner is the third defrosting logic, it is determined whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and whether the continuous operating time length of the compressor is greater than a preset third time length; the preset first temperature > the preset second temperature > the preset third temperature; the preset first time length > the preset second time length > the preset third time length; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operating time length of the compressor is greater than the preset third time length, the first valve and the second valve are opened to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset third stop temperature, or the defrosting time is greater than a preset third stop time, the second valve is closed to end defrosting; the preset first stop temperature > the preset second stop temperature > the preset third stop temperature; the preset first stop time < the preset second stop time < the preset third stop time.

[0104] In the third defrosting logic, the outdoor temperature is very low, and it is considered that both the outdoor outdoor heat exchanger and the outdoor indoor heat exchanger need to be defrosted. The preset third temperature can be set to -10°C, and the preset third time length can be set to 30 min. When the temperature of the outdoor heat exchanger is < -10°C, or the continuous operating time length of the compressor is > 30 min, the air conditioner starts to defrost, and the opening and closing of the first valve and the second valve are controlled in the second defrosting mode, that is, the second valve and the first valve are opened. The preset third stop temperature can be set to 4°C, and the preset third stop time can be set to 12 min. During the defrosting process, if the temperature of the outdoor heat exchanger is > 4°C, or the defrosting time is > 12 min, the defrosting is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0105] In some embodiments, the control unit 104 is further configured to, after the preset third time of ending defrosting, determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, the first valve and the second valve are opened to start defrosting, and the second valve is closed to end defrosting after a preset third ending time length; if the temperature of the outdoor heat exchanger is greater than the preset second temperature threshold, the first valve and the second valve are opened to start defrosting, and the second valve is closed to end defrosting after a preset fourth ending time length; the preset third ending time length > the preset fourth ending time length.

[0106] In the third defrosting logic, after each defrosting, the air conditioner enters a frost inhibition stage to prevent the outdoor heat exchanger from frosting again. The preset third time can be set to 5 min, the preset second temperature threshold can be set to -6℃, the preset third end time can be set to 1.5 min, and the preset fourth end time can be set to 1 min. After 5 min of each defrosting, if the outdoor heat exchanger temperature is ≤-6℃, the air conditioner runs in defrosting mode two for 1.5 min; if the outdoor heat exchanger temperature is >-6℃, the air conditioner runs in defrosting mode two for 1 min. By defrosting for a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0107] In some embodiments, the control unit 104 is also configured to: after a preset fourth time of ending defrosting, determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, then in the third defrosting logic, when the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, or the continuous running time of the compressor is greater than a preset third time, the first valve and the second valve are opened, and the running speed of the compressor is increased.

[0108] In the third defrosting logic, if defrosting in defrosting mode two cannot guarantee the defrosting effect, then in the third defrosting logic, defrosting mode two is replaced by defrosting mode three for defrosting. Specifically, the preset fourth time can be set to 10 min, and the preset second temperature threshold can be set to -6℃. After 10 min of frosting defrosting, if the outdoor heat exchanger temperature is ≤-6℃, then in the third defrosting logic, the valve opening and closing are controlled according to defrosting mode three, i.e. the first valve and the second valve are opened, and the running speed of the compressor is increased. By using a step coverage defrosting mode, automatically switching the defrosting mode, and using a defrosting mode with better defrosting effect for defrosting, a better defrosting effect is guaranteed.

[0109] Figure 5 The flowchart of the defrosting control method of the air conditioner of the present application is shown in Figure 5 as shown, comprising:

[0110] Step 1: 5 min after the air conditioner heating is turned on, determine the size of the outdoor environment temperature T1. If T1 > 2℃, execute step 2; if 2℃ ≥ T1 ≥ -4℃, execute step 3; if T1 < -4℃, execute step 4.

[0111] Step 2, judge whether the outdoor heat exchanger temperature T2≤-2℃, or whether the compressor continuous running time t1>60min. If T2≤-2℃, or t1>60min, then execute defrosting mode one (open the second electromagnetic valve, close the first electromagnetic valve) to defrost. During the defrosting process, if T2>10℃ or the defrosting time t2>5min, then end the defrosting. After 10min of ending the defrosting, re-execute step 2.

[0112] Step 3, judge whether the outdoor heat exchanger temperature T2≤-6℃, or whether the compressor continuous running time t1>45min. If T2≤-6℃, or t1>45min, then execute defrosting mode one to defrost. During the defrosting process, if T2>6℃ or the defrosting time t2>8min, then end the defrosting. After ending the defrosting, execute step 3.1 and step 3.2 respectively.

[0113] Step 3.1, after 8min of ending the defrosting, if T2≤-2℃, then execute defrosting mode one and last for 1min; if T2>-2℃, then execute defrosting mode one and last for 0.5min.

[0114] Step 3.2, after 10min of ending the defrosting, if T2≤-2℃, then after executing step 3 and step 3.1, replace the defrosting mode one with defrosting mode two (open the first electromagnetic valve and the second electromagnetic valve).

[0115] Step 4, judge whether the outdoor heat exchanger temperature T2≤-10℃, or whether the compressor continuous running time t1>30min. If T2≤-10℃, or t1>30min, then execute defrosting mode two to defrost. During the defrosting process, if T2>4℃ or the defrosting time t2>12min, then end the defrosting. After ending the defrosting, execute step 4.1 and step 4.2 respectively.

[0116] Step 4.1, after 5min of ending the defrosting, if T2≤-6℃, then execute defrosting mode two and last for 1.5min; if T2>-2℃, then execute defrosting mode two and last for 1min.

[0117] Step 4.2, after 10min of ending the defrosting, if T2≤-6℃, then after executing step 4 and step 4.1, replace the defrosting mode two with defrosting mode three (open the first electromagnetic valve and the second electromagnetic valve, increase the running speed of the compressor).

[0118] Since the processing and functions realized by the device of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the description of the embodiment is not described in detail, and the related description in the foregoing embodiments can be referred to, which is not described herein.

[0119] The air conditioner provided by the technical scheme of the present application is provided with a coil heat exchanger, the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path, the outdoor heat exchanger includes an outer discharge heat exchanger and an inner discharge heat exchanger which are connected in parallel, the inner discharge heat exchanger is connected with a throttling component, the outer discharge heat exchanger is connected with the throttling component through a first valve, the discharge port of the compressor is connected to the pipeline between the outer discharge heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and a second valve, and the second refrigerant flow path is located on the suction side pipeline of the compressor; when the air conditioner is in heating operation, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; the opening and closing of the first valve and the second valve and the running speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous running time length of the compressor. Thus, the defrosting logic of the air conditioner without shutdown defrosting is determined according to the outdoor environment temperature, the outdoor outer discharge heat exchanger and the outdoor inner discharge heat exchanger are defrosted in combination with the temperature of the outdoor heat exchanger and the continuous running time length of the compressor, the amount of hot gas bypassing refrigerant is matched with the frost formation degree, the defrosting efficiency is improved, meanwhile, the excessive hot gas bypassing refrigerant is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0120] According to the embodiment of the present application, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner can include the control device of the air conditioner described above.

[0121] Since the processing and functions realized by the air conditioner of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, the description of the present embodiment will not be elaborated on the related description in the foregoing embodiments, which will not be repeated here.

[0122] The air conditioner provided by the technical scheme of the present application is provided with a coil heat exchanger, the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path, the outdoor heat exchanger includes an outer discharge heat exchanger and an inner discharge heat exchanger which are connected in parallel, the inner discharge heat exchanger is connected with a throttling component, the outer discharge heat exchanger is connected with the throttling component through a first valve, the discharge port of the compressor is connected to the pipeline between the outer discharge heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and a second valve, and the second refrigerant flow path is located on the suction side pipeline of the compressor; when the air conditioner is in heating operation, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; the opening and closing of the first valve and the second valve and the running speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous running time length of the compressor. Thus, the defrosting logic of the air conditioner without shutdown defrosting is determined according to the outdoor environment temperature, the outdoor outer discharge heat exchanger and the outdoor inner discharge heat exchanger are defrosted in combination with the temperature of the outdoor heat exchanger and the continuous running time length of the compressor, the amount of hot gas bypassing refrigerant is matched with the frost formation degree, the defrosting efficiency is improved, meanwhile, the excessive hot gas bypassing refrigerant is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0123] According to an embodiment of the present application, a storage medium corresponding to the control method of the air conditioner is also provided, which comprises a stored program, wherein when the program is executed, the device where the storage medium is located performs the control method of the air conditioner described above.

[0124] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment does not describe the details which can be found in the foregoing embodiments, and will not be repeated here.

[0125] According to the technical solution of the present application, the air conditioner is provided with a coil heat exchanger having a first refrigerant flow path and a second refrigerant flow path, the outdoor heat exchanger comprises an outer discharge heat exchanger and an inner discharge heat exchanger arranged in parallel, the inner discharge heat exchanger is connected to the throttling component, the outer discharge heat exchanger is connected to the throttling component through the first valve, the discharge port of the compressor is connected to the pipeline between the outer discharge heat exchanger and the first valve in sequence after passing through the first refrigerant flow path and the second valve, and the second refrigerant flow path is located on the compressor suction side pipeline; when the air conditioner is in heating operation, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; the opening and closing of the first valve and the second valve and the running speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous running time of the compressor. Thus, the defrosting logic of the air conditioner without shutdown is determined according to the outdoor environment temperature, the outdoor outer discharge heat exchanger and the outdoor inner discharge heat exchanger are defrosted in combination with the temperature of the outdoor heat exchanger and the continuous running time of the compressor, the amount of hot gas bypassing refrigerant is matched with the frost formation degree, the defrosting efficiency is improved, at the same time, the excessive hot gas bypassing refrigerant is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0126] According to an embodiment of the present application, a computer program product corresponding to the control method of the air conditioner is also provided, which comprises a computer program, and the computer program product is processed to realize the steps of the control method of the air conditioner described above.

[0127] Since the processing and functions realized by the computer program product of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment does not describe the details which can be found in the foregoing embodiments, and will not be repeated here.

[0128] The air conditioner provided by the technical scheme of the present application is provided with a coil heat exchanger, the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path, the outdoor heat exchanger includes an outer discharge heat exchanger and an inner discharge heat exchanger which are arranged in parallel, the inner discharge heat exchanger is connected with a throttling component, the outer discharge heat exchanger is connected with the throttling component through a first valve, the exhaust port of the compressor is connected to the pipeline between the outer discharge heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and a second valve, and the second refrigerant flow path is located on the suction side pipeline of the compressor; when the air conditioner is in heating operation, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; the opening and closing of the first valve and the second valve and the running speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous running time length of the compressor. Thus, the defrosting logic of the air conditioner without shutdown defrosting is determined according to the outdoor environment temperature, the outdoor outer discharge heat exchanger and the outdoor inner discharge heat exchanger are defrosted in combination with the temperature of the outdoor heat exchanger and the continuous running time length of the compressor, the amount of hot gas bypassing refrigerant is matched with the frost formation degree, the defrosting efficiency is improved, meanwhile, the excessive hot gas bypassing refrigerant is avoided to affect the heating effect, and the indoor comfort during defrosting is ensured.

[0129] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0130] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A control method of an air conditioner, characterized by, The air conditioner comprises a compressor, an outdoor heat exchanger, a throttling component, a coil heat exchanger, a first valve, and a second valve; the outdoor heat exchanger comprises an outer row heat exchanger and an inner row heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the inner row heat exchanger is connected to the throttling component; the outer row heat exchanger is connected to the throttling component through the first valve; an exhaust port of the compressor is connected to a pipeline between the outer row heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and the second valve; the second refrigerant flow path is located on a pipeline at a suction side of the compressor; in the coil heat exchanger, the second refrigerant flow path has a refrigerant inlet and a refrigerant outlet, a port of the refrigerant inlet is below a liquid level line, the refrigerant outlet is above the liquid level line, and the refrigerant outlet is connected to a suction port of the compressor; The method comprises: When the air conditioner is in a heating operation, the first valve is in an open state, the second valve is in a closed state, an outdoor environment temperature, a temperature of the outdoor heat exchanger, and a continuous operation time length of the compressor are obtained; A defrosting logic of the air conditioner is determined according to the outdoor environment temperature; The opening and closing of the first valve, the opening and closing of the second valve, and the operation speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operation time length of the compressor.

2. The control method of the air conditioner according to claim 1, characterized by, The defrosting logic of the air conditioner comprises a first defrosting logic, a second defrosting logic, and a third defrosting logic; The defrosting logic of the air conditioner is determined according to the outdoor environment temperature, which comprises: A temperature range in which the outdoor environment temperature is located is determined, which comprises a first temperature range, a second temperature range, and a third temperature range; the first temperature range > the second temperature range > the third temperature range; If the outdoor environment temperature is in the first temperature range, the defrosting logic of the air conditioner is determined as the first defrosting logic; If the outdoor environment temperature is in the second temperature range, the defrosting logic of the air conditioner is determined as the second defrosting logic; If the outdoor environment temperature is in the third temperature range, the defrosting logic of the air conditioner is determined as the third defrosting logic.

3. The control method of the air conditioner according to claim 2, characterized by, The opening and closing of the first valve, the opening and closing of the second valve, and the operation speed of the compressor are controlled according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operation time length of the compressor, which comprises: In a case where the defrosting logic of the air conditioner is the first defrosting logic, it is determined whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature, and whether the continuous operation time length of the compressor is greater than a preset first time length; If the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operation time length of the compressor is greater than the preset first time length, the second valve is opened and the first valve is closed to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset first stop temperature, or the defrosting time is greater than a preset first stop time, the first valve is opened and the second valve is closed to end defrosting.

4. The control method of the air conditioner according to claim 2, characterized by, According to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor are controlled, and the method further comprises: In the case that the defrosting logic of the air conditioner is the second defrosting logic, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature, and whether the continuous running time length of the compressor is greater than a preset second time length; If the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous running time length of the compressor is greater than the preset second time length, the second valve is opened and the first valve is closed to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset second stop temperature, or the time of defrosting is greater than a preset second stop time, the first valve is opened and the second valve is closed to end defrosting.

5. The control method of the air conditioner according to claim 4, characterized by, Further comprising: After a preset first time of ending defrosting, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; If the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, the second valve is opened and the first valve is closed to start defrosting, and after a preset first ending time length, the second valve is closed and the first valve is opened to end defrosting; If the temperature of the outdoor heat exchanger is greater than the first preset temperature threshold, the second valve is opened and the first valve is closed to start defrosting, and after a preset second ending time length, the second valve is closed and the first valve is opened to end defrosting; the preset first ending time length > the preset second ending time length; And / or, After a preset second time of ending defrosting, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold; If the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, then under the second defrosting logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous running time length of the compressor is greater than the preset second time length, the first valve and the second valve are opened.

6. The control method of the air conditioner according to claim 2, characterized by, According to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the running speed of the compressor are controlled, and the method further comprises: In the case that the defrosting logic of the air conditioner is the third defrosting logic, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and whether the continuous running time length of the compressor is greater than a preset third time length; the preset first temperature > the preset second temperature > the preset third temperature; the preset first time length > the preset second time length > the preset third time length; In the case that the defrosting logic of the air conditioner is the third defrosting logic, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and whether the continuous running time length of the compressor is greater than a preset third time length; the preset first temperature > the preset second temperature > the preset third temperature; the preset first time length > the preset second time length > the preset third time length; If the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, or the continuous running time of the compressor is greater than a preset third time length, the first valve and the second valve are opened to start defrosting; then, if the temperature of the outdoor heat exchanger is greater than a preset third stop temperature, or the defrosting time is greater than a preset third stop time, the second valve is closed to end defrosting; the preset first stop temperature > the preset second stop temperature > the preset third stop temperature; the preset first stop time < the preset second stop time < the preset third stop time.

7. The control method of the air conditioner according to claim 6, characterized by, Also comprising: After a preset third time of ending defrosting, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; If the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold, the first valve and the second valve are opened to start defrosting, and the second valve is closed to end defrosting after a preset third end time; If the temperature of the outdoor heat exchanger is greater than a preset second temperature threshold, the first valve and the second valve are opened to start defrosting, and the second valve is closed to end defrosting after a preset fourth end time; the preset third end time > the preset fourth end time; And / or, After a preset fourth time of ending defrosting, it is judged whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold; If the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold, then under the third defrosting logic, when the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, or the continuous running time of the compressor is greater than a preset third time length, the first valve and the second valve are opened, and the running speed of the compressor is increased.

8. A control device of an air conditioner, characterized by comprising: The air conditioner comprises a compressor, an outdoor heat exchanger, a throttling component, a coil heat exchanger, a first valve, and a second valve; the outdoor heat exchanger comprises an outer row heat exchanger and an inner row heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the inner row heat exchanger is connected to the throttling component; the outer row heat exchanger is connected to the throttling component through the first valve; the exhaust port of the compressor is connected to the pipeline between the outer row heat exchanger and the first valve after sequentially passing through the first refrigerant flow path and the second valve; the second refrigerant flow path is located on the pipeline of the suction side of the compressor; in the coil heat exchanger, the second refrigerant flow path has a refrigerant inlet and a refrigerant outlet, the port of the refrigerant inlet is below the liquid level line, the refrigerant outlet is above the liquid level line, and the refrigerant outlet is connected to the suction port of the compressor; The device comprises: An acquisition unit configured to, when the air conditioner is in heating operation, the first valve is in an open state, and the second valve is in a closed state, acquire an outdoor environment temperature, a temperature of the outdoor heat exchanger, and a continuous running time of the compressor; A control unit configured to determine a defrosting logic of the air conditioner according to the outdoor environment temperature; The control unit is further configured to control opening and closing of the first valve, opening and closing of the second valve, and running speed of the compressor according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous running time length of the compressor.

9. An air conditioner characterized by comprising: Comprising: The control device of the air conditioner of claim 8.

10. A storage medium, characterized by The storage medium includes a stored program, wherein the program, when executed, controls a device in which the storage medium is located to perform the control method of the air conditioner of any one of claims 1 to 7.

11. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 7.

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