Air conditioner control method and device, air conditioner, storage medium and program product

Abstract

The invention discloses an air conditioner control method and device, an air conditioner, a storage medium and a computer program product, the air conditioner is provided with a coil heat exchanger, the coil heat exchanger is provided with a first refrigerant flow path and a second refrigerant flow path, and an outdoor heat exchanger comprises an outer row heat exchanger and an inner row heat exchanger; the discharge heat exchanger is connected with the throttling component through a first valve; an exhaust port of the compressor sequentially passes through the first refrigerant flow path and the second valve and then is connected to a pipeline between the discharge heat exchanger and the first valve; the second refrigerant flow path is positioned on the air suction side pipeline of the compressor; the method comprises the steps that when the air conditioner heats, the defrosting logic of the air conditioner is determined according to the outdoor environment temperature; and according to the defrosting logic, the temperature of the outdoor heat exchanger and the continuous operation duration of the compressor, opening and closing of the first valve and the second valve and the operation rotating speed of the compressor are controlled. According to the scheme, the outer-row heat exchanger and the inner-row heat exchanger are defrosted, so that the refrigerant amount of the hot gas bypass is matched with the frosting degree, and the defrosting efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and specifically relates to a control method and device for an air conditioner, an air conditioner, a storage medium and a computer program product. Background Art

[0002] When the air conditioner is in heating operation, when the temperature of the outdoor heat exchanger reaches the defrosting temperature point, the air conditioner usually uses the four-way valve reversing method to defrost. During the defrosting process, the air conditioner cannot provide heat to the room, resulting in a decrease in indoor comfort. Therefore, the relevant solution is to use hot air bypass to defrost, that is, to pass high-temperature refrigerant into the outdoor heat exchanger for defrosting. In 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 not only a certain defrosting delay, but also the defrosting efficiency is not high. The amount of refrigerant required for bypass is large, and then the amount of refrigerant used for indoor heating is reduced, resulting in a poor heating effect.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide an air conditioner control method, device, air conditioner, storage medium and computer program product to solve the problems of low defrosting efficiency, large amount of refrigerant required for bypass and poor heating effect when the air conditioner adopts hot gas bypass defrosting in related schemes, so as to achieve the defrosting logic of the air conditioner without stopping the defrosting according to the outdoor ambient temperature, and to defrost the outdoor external heat exchanger and the outdoor internal heat exchanger in combination with the outdoor heat exchanger temperature and the continuous operation time of the compressor, so that the amount of refrigerant bypassed by hot gas matches the degree of frost, thereby improving the defrosting efficiency, avoiding excessive refrigerant bypassing the hot gas and affecting the heating effect, and ensuring the indoor comfort effect during defrosting.

[0005] The present invention provides a control method for 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 external heat exchanger and an internal heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the internal heat exchanger is connected to the throttling component; the external 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 external heat exchanger and the first valve after passing through the first refrigerant flow path and the second valve in sequence; the second refrigerant flow path is located on the pipeline on 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 ambient temperature, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor are obtained; the defrosting logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled.

[0006] In some embodiments, the defrost logic of the air conditioner includes: a first defrost logic, a second defrost logic, and a third defrost logic; the defrost logic of the air conditioner is determined according to the outdoor ambient temperature, including: judging the temperature range of the outdoor ambient temperature, 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 defrost logic of the air conditioner is determined to be the first defrost logic; if the outdoor ambient temperature is in the second temperature range, the defrost logic of the air conditioner is determined to be the second defrost logic; if the outdoor ambient temperature is in the third temperature range, the defrost logic of the air conditioner is determined to be the third defrost logic.

[0007] In some embodiments, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, including: when the defrost logic of the air conditioner is the first defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, and judging whether the continuous operation time of the compressor is greater than the preset first time; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operation time of the compressor is greater than the preset first time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset first stop temperature, or the defrost time is greater than the preset first stop time, opening the first valve and closing the second valve to end defrosting.

[0008] In some embodiments, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, and also include: when the defrost logic of the air conditioner is the second defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, and judging whether the continuous operation time of the compressor is greater than the preset second time; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset second stop temperature, or the defrost time is greater than the preset second stop time, opening the first valve and closing the second valve to end defrosting.

[0009] In some embodiments, it also includes: after the preset first time of ending defrosting, judging whether the temperature of the outdoor heat exchanger is less than or equal to the 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, closing the second valve and opening the first valve after the preset first end time to end defrosting; 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, closing the second valve and opening the first valve after the preset second end time to end defrosting; the preset first end time>the preset second end time and / or, after the preset second time of ending defrosting, judging whether the temperature of the outdoor heat exchanger is less than or equal to the 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, opening the first valve and the second valve.

[0010] In some embodiments, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, and the method also includes: when the defrost logic of the air conditioner is the third defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and judging whether the continuous operation time of the compressor is greater than a preset third time; the preset first temperature>the preset second temperature>the preset third temperature; the preset first time>the preset second time>the preset third time; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, opening the first valve and the second valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset third stop temperature, or the defrost time is greater than the preset third stop time, closing the second valve 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.

[0011] In some embodiments, it also includes: after the preset third time of ending defrosting, judging 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, opening the first valve and the second valve to start defrosting, and closing the second valve to end defrosting after the preset third end time; 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 the preset fourth end time; the preset third end time>the preset fourth end time; and / or, after the preset fourth time of ending defrosting, judging 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 operation time of the compressor is greater than the preset third time, opening the first valve and the second valve and increasing the operating speed of the compressor.

[0012] Matching the above method, the present invention provides a control device for an air conditioner on the other hand, 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 external heat exchanger and an internal heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the internal heat exchanger is connected to the throttling component; the external 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 external heat exchanger and the first valve after passing through the first refrigerant flow path and the second valve in sequence; the second The refrigerant flow path is located on the pipeline on the suction side of the compressor; the device includes: an acquisition unit, configured to acquire the outdoor ambient temperature, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor when the air conditioner is in heating operation, with the first valve in an open state and the second valve in a closed state; a control unit, configured to determine the defrost logic of the air conditioner according to the outdoor ambient temperature; the control unit 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 defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor.

[0013] In some embodiments, the defrost logic of the air conditioner includes: a first defrost logic, a second defrost logic, and a third defrost logic; the control unit determines the defrost logic of the air conditioner according to the outdoor ambient temperature, including: judging the temperature range of the outdoor ambient temperature, 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, then the defrost logic of the air conditioner is determined to be the first defrost logic; if the outdoor ambient temperature is in the second temperature range, then the defrost logic of the air conditioner is determined to be the second defrost logic; if the outdoor ambient temperature is in the third temperature range, then the defrost logic of the air conditioner is determined to be the third defrost logic.

[0014] 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 operating speed of the compressor according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, including: when the defrost logic of the air conditioner is the first defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, and judging whether the continuous operation time of the compressor is greater than the preset first time; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operation time of the compressor is greater than the preset first time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset first stop temperature, or the defrost time is greater than the preset first stop time, opening the first valve and closing the second valve to end defrosting.

[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 operating speed of the compressor according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, and also includes: when the defrost logic of the air conditioner is the second defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, and judging whether the continuous operation time of the compressor is greater than the preset second time; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset second stop temperature, or the defrost time is greater than the preset second stop time, opening the first valve and closing the second valve to end defrosting.

[0016] In some embodiments, the control unit is further configured to determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold after a preset first time for defrosting to end; 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 the second valve is closed and the first valve is opened to end defrosting after a preset first end time; 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 the second valve is closed and the first valve is opened to end defrosting after a preset second end time; the preset first end time>the preset second end time and / or,

[0017] After the preset second time of defrosting ends, determine whether the temperature of the outdoor heat exchanger is less than or equal to the 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, open the first valve and the second valve.

[0018] 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 operating speed of the compressor according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, and also includes: when the defrost logic of the air conditioner is the third defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to a preset third temperature, and judging whether the continuous operation time of the compressor is greater than a preset third time; the preset first temperature>the preset second temperature>the preset third temperature; the preset first time>the preset second time>the preset third time; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, opening the first valve and the second valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset third stop temperature, or the defrost time is greater than the preset third stop time, closing the second valve 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.

[0019] In some embodiments, the control unit is further configured to determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold after a preset third time for defrosting to end; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, open the first valve and the second valve to start defrosting, and close the second valve to end defrosting after a preset third end time; if the temperature of the outdoor heat exchanger is greater than the preset second temperature threshold, open the first valve and the second valve to start defrosting, and close the second valve to end defrosting after a preset fourth end time; the preset third end time>the preset fourth end time; and / or, after the preset fourth time for defrosting to end, determine 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, open the first valve and the second valve and increase the operating speed of the compressor.

[0020] Matching the above device, the present invention provides an air conditioner on another aspect, including: the control device of the air conditioner mentioned above.

[0021] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioning control method.

[0022] In accordance with the above method, the present invention provides a computer program product on another aspect, wherein the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the above air conditioner control method are implemented.

[0023] According to the scheme of the present invention, 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 external heat exchanger and an internal heat exchanger arranged in parallel, the internal heat exchanger is connected to the throttling component, the external heat exchanger is connected to the throttling component through a first valve, the exhaust port of the compressor passes through the first refrigerant flow path and the second valve in sequence and is connected to the pipeline between the external heat exchanger and the first 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 defrost logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve and the second valve and the operating speed of the compressor are controlled. Therefore, the defrost logic of the air conditioner defrosting without stopping is determined according to the outdoor ambient temperature, and the outdoor external heat exchanger and the outdoor internal 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 hot air matches the degree of frost, thereby improving the defrost efficiency. At the same time, the influence of excessive refrigerant bypassing by hot air on the heating effect is avoided, thereby ensuring the indoor comfort during defrosting.

[0024] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for controlling an air conditioner of the present invention;

[0027] Figure 2 A schematic structural diagram of an embodiment of a control device for an air conditioner of the present invention;

[0028] Figure 3 is a system structure diagram of the air conditioner of the present invention;

[0029] Figure 4It is a structural diagram of a coil heat exchanger in an air conditioner of the present invention;

[0030] Figure 5 The figure is a flow chart of the defrosting control method of the air conditioner according to the present invention.

[0031] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0032] 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 heat exchanger; 11- outdoor outdoor heat exchanger; 12- first refrigerant inlet; 13- first refrigerant outlet; 14- second refrigerant inlet; 15- second refrigerant outlet; 102- acquisition unit; 104- control unit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] According to an embodiment of the present invention, a control method for an air conditioner is provided, wherein 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 external heat exchanger and an internal heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the internal heat exchanger is connected to the throttling component; the external 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 external heat exchanger and the first valve after passing through the first refrigerant flow path and the second valve in sequence; the second refrigerant flow path is located on the pipeline on the suction side of the compressor.

[0035] The specific structure of the air conditioner is as follows Figure 3As shown, when the air conditioner is in normal cooling or heating state, the first valve 6 is in a normally open state and the second valve 7 is in a normally closed state. In the cooling mode, the refrigerant discharged from the exhaust 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 internal heat exchanger 10, the outdoor external 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 air intake port of the compressor 1. At this time, the coil heat exchanger 8 is equivalent to a liquid reservoir and can store liquid refrigerant. In the heating mode, the refrigerant discharged from the exhaust port of the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger (the outdoor internal heat exchanger 10, the outdoor external 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 air intake port of the compressor 1. At this time, the coil heat exchanger 8 is equivalent to a liquid reservoir and can store liquid refrigerant.

[0036] In the 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, so that the liquid refrigerant is heated and vaporized, increasing the amount of refrigerant in the system, improving the heating capacity and defrosting efficiency of the system, and preventing the liquid refrigerant from flowing into the compressor and affecting the operation of the compressor. 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 is connected to the second refrigerant outlet 15 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.

[0037] like Figure 1 The flowchart of an embodiment of the method of the present invention is shown in FIG. The air conditioner control method may include: steps S110 to S130.

[0038] In step S110, when the air conditioner is in heating operation, the first valve is in an open state, the second valve is in a closed state, and the outdoor environment 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.

[0039] In step S120, the defrost logic of the air conditioner is determined according to the outdoor ambient temperature.

[0040] Defrosting judgment starts 5 minutes after the air conditioner is turned on for heating. First, different defrosting logics are determined according to the outdoor ambient temperature. Different outdoor ambient temperatures correspond to different working conditions. The degree of frost of the air conditioner is different under each working condition, so the defrosting logic executed during defrosting is different, so that the defrosting capacity matches the current degree of frost, avoiding frequent defrosting due to insufficient defrosting and excessive refrigerant in hot gas bypass, which affects the heating of the air conditioner.

[0041] In some embodiments, the defrost logic of the air conditioner includes: a first defrost logic, a second defrost logic, and a third defrost logic. In step S120, the specific process of determining the defrost logic of the air conditioner according to the outdoor ambient temperature includes: judging the temperature range of the outdoor ambient 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 ambient temperature is in the first temperature range, then determining the defrost logic of the air conditioner to be the first defrost logic; if the outdoor ambient temperature is in the second temperature range, then determining the defrost logic of the air conditioner to be the second defrost logic; if the outdoor ambient temperature is in the third temperature range, then determining the defrost logic of the air conditioner to be the third defrost logic.

[0042] The temperature range is used to determine the degree of frost on the outdoor heat exchanger. The lower the outdoor ambient temperature, the more severe the frost on the outdoor heat exchanger. The first temperature range can be set to a range greater than 2°C, corresponding to the light working condition of the air conditioner. The first defrost logic is used for defrosting under the light working condition. The second temperature range can be set to -4°C to 2°C, corresponding to the medium working condition of the air conditioner. The second defrost logic is used for defrosting under the medium working condition. The third temperature range can be set to a range less than -4°C, corresponding to the heavy working condition of the air conditioner. The third defrost logic is used for defrosting under the heavy working condition. By adopting different defrost logics according to different outdoor ambient temperatures, the defrost efficiency can be improved, so that the amount of refrigerant in the hot gas bypass meets the current demand, avoiding the situation where the amount of refrigerant in the hot gas bypass is insufficient and the defrosting is not thorough, and the amount of refrigerant in the hot gas bypass is too much, which affects the heating.

[0043] In step S130, the opening and closing of the first valve, the opening and closing of the second valve, and the operating 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.

[0044] The system has three preset defrost modes to control the opening and closing of the first valve and the second valve and the operating speed of the compressor. Each defrost mode has a different control method, so the defrost efficiency is different. During normal heating, the first valve is open and the second valve is closed. The three defrost modes include:

[0045] Defrost mode 1: Open the second solenoid valve and close the first solenoid valve.

[0046] Defrost mode 2: Open the first solenoid valve and the second solenoid valve.

[0047] Defrost mode three: Open the first solenoid valve and the second solenoid valve to increase the operating speed of the compressor.

[0048] Defrost mode 1, defrost mode 2 and defrost mode 3 all perform defrost without stopping the air conditioner, that is, the air conditioner is still in heating mode during the defrost process and can continuously provide heat to the room.

[0049] Compared with the outdoor internal heat exchanger 10, the outdoor external heat exchanger 11 is more prone to frost. Therefore, in the defrost mode, the first solenoid valve is closed, and the low-temperature refrigerant flowing from the indoor side to the outdoor side will not flow to the outdoor external heat exchanger 11; at this time, the high temperature discharged by the compressor 1 flows into the outdoor external heat exchanger 11 after passing through the coil heat exchanger 8 and the second solenoid valve 7, and the outdoor external heat exchanger 11 is defrosted.

[0050] In defrost mode 2, the refrigerant flowing into the outdoor external heat exchanger 11 is only the high-temperature refrigerant discharged from the compressor 1, and the refrigerant flowing into the outdoor internal 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 degree of frost in the outdoor external heat exchanger 11 is more serious than that in the outdoor internal heat exchanger 10, the amount of refrigerant bypassed by hot gas can be distinguished according to different degrees of frost in the defrost mode, thereby improving the defrost efficiency and avoiding the heat waste of the refrigerant bypassed by hot gas.

[0051] In defrost mode three, not only the first solenoid valve and the second solenoid valve are opened, but also the operating speed of the compressor is increased, the refrigerant flow of the hot gas bypass is increased, and the temperature at the outdoor heat exchanger is further increased to ensure thorough defrosting.

[0052] In some embodiments, in step S130, the specific process of controlling 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 defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor includes: when the defrost logic of the air conditioner is the first defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, and judging whether the continuous operation time of the compressor is greater than the preset first time; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operation time of the compressor is greater than the preset first time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset first stop temperature, or the defrost time is greater than the preset first stop time, opening the first valve and closing the second valve to end defrosting.

[0053] Under the first defrost logic, the outdoor temperature is relatively high, and it is considered that only the outdoor outer heat exchanger needs to be defrosted, and the outdoor inner heat exchanger does not need to be defrosted. The preset first temperature can be set to -2°C, and the preset first duration can be set to 60min. When the temperature of the outdoor heat exchanger is ≤-2°C, or the continuous operation time of the compressor is >60min, the air conditioner starts to defrost, and controls the opening and closing of the first valve and the second valve in defrost mode 1, that is, opens the second valve and closes the first valve. The preset first stop temperature can be set to 10°C, and the preset first stop time can be set to 5min. During the defrost process, if the temperature of the outdoor heat exchanger is >10°C, or the defrost time is >5min, the defrost is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0054] In some embodiments, in step S130, the specific process of controlling 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 defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor also includes: when the defrost logic of the air conditioner is the second defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, and judging whether the continuous operation time of the compressor is greater than the preset second time; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset second stop temperature, or the defrost time is greater than the preset second stop time, opening the first valve and closing the second valve to end defrosting.

[0055] Under the second defrost logic, the outdoor temperature is relatively low, and it is considered that both the outdoor external heat exchanger and the outdoor internal heat exchanger need to be defrosted. The preset second temperature can be set to -6°C, and the preset second duration can be set to 45min. When the temperature of the outdoor heat exchanger is less than -2°C, or the continuous operation time of the compressor is greater than 45min, the air conditioner starts to defrost, and controls the opening and closing of the first valve and the second valve in defrost mode 1, that is, opens the second valve and closes the first valve. The preset second stop temperature can be set to 6°C, and the preset second stop time can be set to 8min. During the defrost process, if the temperature of the outdoor heat exchanger is greater than 6°C, or the defrost time is greater than 8min, the defrost is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0056] In some embodiments, it also includes a process of suppressing frost under the second defrost logic, and the process specifically includes: after the preset first time of ending defrosting, judging whether the temperature of the outdoor heat exchanger is less than or equal to the 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 the preset first end time; 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 the preset second end time; the preset first end time>the preset second end time.

[0057] Under the second defrost logic, after each defrost is completed, the air conditioner will enter the frost suppression stage to prevent the outdoor heat exchanger from frosting again. The preset first time can be set to 8 minutes, the preset temperature threshold can be set to -2°C, the preset first end time can be set to 1 minute, and the preset second end time can be set to 0.5 minutes. 8 minutes after each defrost is completed, if the outdoor heat exchanger temperature is ≤-2°C, the air conditioner will continue to run the defrost mode for 1 minute; if the outdoor heat exchanger temperature is >-2°C, the air conditioner will continue to run the defrost mode for 0.5 minutes. By defrosting in a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0058] In some embodiments, it also includes a process of switching the defrost mode under the second defrost logic, which specifically includes: after the preset second time of ending the defrost, judging whether the temperature of the outdoor heat exchanger is less than or equal to the 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, opening the first valve and the second valve.

[0059] Under the second defrost logic, if the defrost effect cannot be guaranteed by defrost mode one, then under the second defrost logic, defrost mode one is replaced with defrost mode two for defrost. Specifically, the preset second time can be set to 10 minutes, and the preset first temperature threshold can be set to -2°C. 10 minutes after frosting and defrosting, if the outdoor heat exchanger temperature is ≤-2°C, then under the second defrost logic, the valve opening and closing is controlled according to defrost mode two, that is, the first valve and the second valve are opened. By using a step-covering defrost mode, the defrost mode is automatically switched, and a defrost mode with a better defrost effect is used for defrosting to ensure a better defrost effect.

[0060] In some embodiments, in step S130, the specific process of controlling 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 defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor also includes: when the defrost logic of the air conditioner is the third defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, and judging whether the continuous operation time of the compressor is greater than the preset third time; the preset first temperature>the preset second temperature>the preset third temperature; the preset first time>the preset second time>the preset third time; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, opening the first valve and the second valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset third stop temperature, or the defrost time is greater than the preset third stop time, closing the second valve 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.

[0061] Under the third defrost logic, the outdoor temperature is very low, and it is considered that both the outdoor external heat exchanger and the outdoor internal heat exchanger need strong defrosting. The preset third temperature can be set to -10℃, and the preset third time can be set to 30min. When the temperature of the outdoor heat exchanger is less than -10℃, or the continuous operation time of the compressor is greater than 30min, the air conditioner starts to defrost, and controls the opening and closing of the first valve and the second valve in defrost mode 2, that is, opens the second valve and the first valve. The preset third stop temperature can be set to 4℃, and the preset third stop time can be set to 12min. During the defrost process, if the temperature of the outdoor heat exchanger is greater than 4℃, or the defrost time is greater than 12min, the defrost is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0062] In some embodiments, it also includes a process of suppressing frost under the third defrost logic, and the process specifically includes: after the preset third time of ending defrosting, judging 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, opening the first valve and the second valve to start defrosting, and closing the second valve to end defrosting after the preset third end time; 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 the preset fourth end time; the preset third end time>the preset fourth end time.

[0063] Under the third defrost logic, after each defrost is completed, the air conditioner will enter the frost suppression stage to prevent the outdoor heat exchanger from frosting again. The preset third time can be set to 5 minutes, the preset second temperature threshold can be set to -6°C, the preset third end time can be set to 1.5 minutes, and the preset fourth end time can be set to 1 minute. 5 minutes after each defrost is completed, if the outdoor heat exchanger temperature is ≤-6°C, the air conditioner runs defrost mode 2 and lasts for 1.5 minutes; if the outdoor heat exchanger temperature is >-6°C, the air conditioner runs defrost mode 2 and lasts for 1 minute. By defrosting in a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0064] In some embodiments, it also includes a process of switching the defrost mode under the third defrost logic, which specifically includes: after the preset fourth time of ending the defrost, judging 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, opening the first valve and the second valve and increasing the operating speed of the compressor.

[0065] Under the third defrost logic, if the defrost effect cannot be guaranteed by defrost mode 2, then under the third defrost logic, defrost mode 2 is replaced by defrost mode 3 for defrost. Specifically, the preset fourth time can be set to 10 minutes, and the preset second temperature threshold can be set to -6°C. 10 minutes after frosting and defrosting, if the outdoor heat exchanger temperature is ≤-6°C, then under the third defrost logic, the valve opening and closing is controlled according to defrost mode 3, that is, the first valve and the second valve are opened and the operating speed of the compressor is increased. By using a step-covering defrost mode, the defrost mode is automatically switched, and a defrost mode with a better defrost effect is used for defrosting to ensure a better defrost effect.

[0066] Figure 5 FIG. 1 is a flow chart of the defrosting control method of the air conditioner of the present invention, as shown in FIG. Figure 5 As shown, including:

[0067] Step 1: 5 minutes after the air conditioner is turned on for heating, determine the outdoor ambient temperature T1. If T1>2°C, execute step 2; if 2°C≥T1≥-4°C, execute step 3; if T1<-4°C, execute step 4.

[0068] Step 2, determine whether the outdoor heat exchanger temperature T2 ≤ -2 ° C, or whether the compressor continuous operation time t1 > 60min. If T2 ≤ -2 ° C, or t1 > 60min, execute defrost mode 1 (open the second solenoid valve, close the first solenoid valve) to defrost. During the defrost process, if T2 > 10 ° C or the defrost time t2 > 5min, end the defrost. Re-execute step 2 10 minutes after the end of defrost.

[0069] Step 3, determine whether the outdoor heat exchanger temperature T2 ≤ -6 ° C, or whether the compressor continuous operation time t1 > 45min. If T2 ≤ -6 ° C, or t1 > 45min, execute defrost mode 1 for defrosting. During the defrosting process, if T2 > 6 ° C or defrost time t2 > 8min, end the defrosting. After the defrosting is finished, execute steps 3.1 and 3.2 respectively.

[0070] Step 3.1, 8 minutes after the defrost is completed, if T2 ≤ -2°C, the defrost mode is executed for 1 minute; if T2 > -2°C, the defrost mode is executed for 0.5 minutes.

[0071] Step 3.2, 10 minutes after the defrosting is finished, if T2≤-2°C, then when executing step 3 and step 3.1, the defrost mode 1 is replaced with the defrost mode 2 (opening the first solenoid valve and the second solenoid valve).

[0072] Step 4, determine whether the outdoor heat exchanger temperature T2 ≤ -10 ° C, or whether the compressor continuous operation time t1 > 30min. If T2 ≤ -10 ° C, or t1 > 30min, execute defrost mode 2 for defrosting. During the defrosting process, if T2 > 4 ° C or defrost time t2 > 12min, end the defrosting. After the defrosting is finished, execute steps 4.1 and 4.2 respectively.

[0073] Step 4.1, 5 minutes after the defrost is completed, if T2 ≤ -6°C, execute defrost mode 2 and continue for 1.5 minutes; if T2 > -2°C, execute defrost mode 2 and continue for 1 minute.

[0074] Step 4.2, 10 minutes after the defrosting is completed, if T2≤-6°C, then when executing steps 4 and 4.1, replace defrost mode 2 with defrost mode 3 (open the first solenoid valve and the second solenoid valve, and increase the operating speed of the compressor).

[0075] According to the technical solution of this 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 external heat exchanger and an internal heat exchanger arranged in parallel, the internal heat exchanger is connected to the throttling component, the external heat exchanger is connected to the throttling component through a first valve, the exhaust port of the compressor passes through the first refrigerant flow path and the second valve in sequence and is connected to the pipeline between the external heat exchanger and the first 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 defrost logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve and the second valve and the operating speed of the compressor are controlled. Therefore, the defrost logic of the air conditioner defrosting without stopping is determined according to the outdoor ambient temperature, and the outdoor external heat exchanger and the outdoor internal 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 hot air matches the degree of frost, thereby improving the defrost efficiency. At the same time, the influence of excessive refrigerant bypassing by hot air on the heating effect is avoided, thereby ensuring the indoor comfort during defrosting.

[0076] According to an embodiment of the present invention, a control device for an air conditioner corresponding to the control method for an 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 external heat exchanger and an internal heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the internal heat exchanger is connected to the throttling component; the external 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 external heat exchanger and the first valve after passing through the first refrigerant flow path and the second valve in sequence; the second refrigerant flow path is located on the pipeline on the suction side of the compressor.

[0077] The specific structure of the air conditioner is as follows Figure 3 As shown, when the air conditioner is in normal cooling or heating state, the first valve 6 is in a normally open state and the second valve 7 is in a normally closed state. In the cooling mode, the refrigerant discharged from the exhaust 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 internal heat exchanger 10, the outdoor external 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 air intake port of the compressor 1. At this time, the coil heat exchanger 8 is equivalent to a liquid reservoir and can store liquid refrigerant. In the heating mode, the refrigerant discharged from the exhaust port of the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger (the outdoor internal heat exchanger 10, the outdoor external 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 air intake port of the compressor 1. At this time, the coil heat exchanger 8 is equivalent to a liquid reservoir and can store liquid refrigerant.

[0078] In the 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, so that the liquid refrigerant is heated and vaporized, increasing the amount of refrigerant in the system, improving the heating capacity and defrosting efficiency of the system, and preventing the liquid refrigerant from flowing into the compressor and affecting the operation of the compressor. 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 is connected to the second refrigerant outlet 15 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.

[0079] See also Figure 2 The schematic diagram of the structure of an embodiment of the device of the present invention is shown. The control device of the air conditioner may include: an acquisition unit 102 and a control unit 104.

[0080] The acquisition unit 102 is configured to acquire the outdoor ambient temperature, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor when the air conditioner is in heating operation and the first valve is in an open state and the second valve is in a closed state. The temperature of the outdoor heat exchanger includes the temperature of the external heat exchanger and the temperature of the internal heat exchanger. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0081] The control unit 104 is configured to determine the defrosting logic of the air conditioner according to the outdoor ambient temperature. The specific functions and processing of the control unit 104 refer to step S120.

[0082] Defrosting judgment starts 5 minutes after the air conditioner is turned on for heating. First, different defrosting logics are determined according to the outdoor ambient temperature. Different outdoor ambient temperatures correspond to different working conditions. The degree of frost of the air conditioner is different under each working condition, so the defrosting logic executed during defrosting is different, so that the defrosting capacity matches the current degree of frost, avoiding frequent defrosting due to insufficient defrosting and excessive refrigerant in hot gas bypass, which affects the heating of the air conditioner.

[0083] In some embodiments, the defrost logic of the air conditioner includes: a first defrost logic, a second defrost logic, and a third defrost logic. The control unit 104 determines the specific process of the defrost logic of the air conditioner according to the outdoor ambient temperature, including: judging the temperature range of the outdoor ambient temperature, 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, then determining the defrost logic of the air conditioner to be the first defrost logic; if the outdoor ambient temperature is in the second temperature range, then determining the defrost logic of the air conditioner to be the second defrost logic; if the outdoor ambient temperature is in the third temperature range, then determining the defrost logic of the air conditioner to be the third defrost logic.

[0084] The temperature range is used to determine the degree of frost on the outdoor heat exchanger. The lower the outdoor ambient temperature, the more severe the frost on the outdoor heat exchanger. The first temperature range can be set to a range greater than 2°C, corresponding to the light working condition of the air conditioner. The first defrost logic is used for defrosting under the light working condition. The second temperature range can be set to -4°C to 2°C, corresponding to the medium working condition of the air conditioner. The second defrost logic is used for defrosting under the medium working condition. The third temperature range can be set to a range less than -4°C, corresponding to the heavy working condition of the air conditioner. The third defrost logic is used for defrosting under the heavy working condition. By adopting different defrost logics according to different outdoor ambient temperatures, the defrost efficiency can be improved, so that the amount of refrigerant in the hot gas bypass meets the current demand, avoiding the situation where the amount of refrigerant in the hot gas bypass is insufficient and the defrosting is not thorough, and the amount of refrigerant in the hot gas bypass is too much, which affects the heating.

[0085] The control unit 104 is further 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 operation time of the compressor. The specific functions and processing of the control unit 104 refer to step S130.

[0086] The system has three preset defrost modes to control the opening and closing of the first valve and the second valve and the operating speed of the compressor. Each defrost mode has a different control method, so the defrost efficiency is different. During normal heating, the first valve is open and the second valve is closed. The three defrost modes include:

[0087] Defrost mode 1: Open the second solenoid valve and close the first solenoid valve.

[0088] Defrost mode 2: Open the first solenoid valve and the second solenoid valve.

[0089] Defrost mode three: Open the first solenoid valve and the second solenoid valve to increase the operating speed of the compressor.

[0090] Defrost mode 1, defrost mode 2 and defrost mode 3 all perform defrost without stopping the air conditioner, that is, the air conditioner is still in heating mode during the defrost process and can continuously provide heat to the room.

[0091] Compared with the outdoor internal heat exchanger 10, the outdoor external heat exchanger 11 is more prone to frost. Therefore, in the defrost mode, the first solenoid valve is closed, and the low-temperature refrigerant flowing from the indoor side to the outdoor side will not flow to the outdoor external heat exchanger 11; at this time, the high temperature discharged by the compressor 1 flows into the outdoor external heat exchanger 11 after passing through the coil heat exchanger 8 and the second solenoid valve 7, and the outdoor external heat exchanger 11 is defrosted.

[0092] In defrost mode 2, the refrigerant flowing into the outdoor external heat exchanger 11 is only the high-temperature refrigerant discharged from the compressor 1, and the refrigerant flowing into the outdoor internal 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 degree of frost in the outdoor external heat exchanger 11 is more serious than that in the outdoor internal heat exchanger 10, the amount of refrigerant bypassed by hot gas can be distinguished according to different degrees of frost in the defrost mode, thereby improving the defrost efficiency and avoiding the heat waste of the refrigerant bypassed by hot gas.

[0093] In defrost mode three, not only the first solenoid valve and the second solenoid valve are opened, but also the operating speed of the compressor is increased, the refrigerant flow of the hot gas bypass is increased, and the temperature at the outdoor heat exchanger is further increased to ensure thorough defrosting.

[0094] 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 operating speed of the compressor according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, including: when the defrost logic of the air conditioner is the first defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, and judging whether the continuous operation time of the compressor is greater than the preset first time; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operation time of the compressor is greater than the preset first time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset first stop temperature, or the defrost time is greater than the preset first stop time, opening the first valve and closing the second valve to end defrosting.

[0095] Under the first defrost logic, the outdoor temperature is relatively high, and it is considered that only the outdoor outer heat exchanger needs to be defrosted, and the outdoor inner heat exchanger does not need to be defrosted. The preset first temperature can be set to -2°C, and the preset first duration can be set to 60min. When the temperature of the outdoor heat exchanger is ≤-2°C, or the continuous operation time of the compressor is >60min, the air conditioner starts to defrost, and controls the opening and closing of the first valve and the second valve in defrost mode 1, that is, opens the second valve and closes the first valve. The preset first stop temperature can be set to 10°C, and the preset first stop time can be set to 5min. During the defrost process, if the temperature of the outdoor heat exchanger is >10°C, or the defrost time is >5min, the defrost is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0096] 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 operating speed of the compressor according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, and also includes: when the defrost logic of the air conditioner is the second defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, and judging whether the continuous operation time of the compressor is greater than the preset second time; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, opening the second valve and closing the first valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset second stop temperature, or the defrost time is greater than the preset second stop time, opening the first valve and closing the second valve to end defrosting.

[0097] Under the second defrost logic, the outdoor temperature is relatively low, and it is considered that both the outdoor external heat exchanger and the outdoor internal heat exchanger need to be defrosted. The preset second temperature can be set to -6°C, and the preset second duration can be set to 45min. When the temperature of the outdoor heat exchanger is less than -2°C, or the continuous operation time of the compressor is greater than 45min, the air conditioner starts to defrost, and controls the opening and closing of the first valve and the second valve in defrost mode 1, that is, opens the second valve and closes the first valve. The preset second stop temperature can be set to 6°C, and the preset second stop time can be set to 8min. During the defrost process, if the temperature of the outdoor heat exchanger is greater than 6°C, or the defrost time is greater than 8min, the defrost is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0098] In some embodiments, the control unit 104 is further configured to: determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold after a preset first time for ending defrosting; 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 end time; 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 end time; the preset first end time>the preset second end time.

[0099] Under the second defrost logic, after each defrost is completed, the air conditioner will enter the frost suppression stage to prevent the outdoor heat exchanger from frosting again. The preset first time can be set to 8 minutes, the preset temperature threshold can be set to -2°C, the preset first end time can be set to 1 minute, and the preset second end time can be set to 0.5 minutes. 8 minutes after each defrost is completed, if the outdoor heat exchanger temperature is ≤-2°C, the air conditioner will continue to run the defrost mode for 1 minute; if the outdoor heat exchanger temperature is >-2°C, the air conditioner will continue to run the defrost mode for 0.5 minutes. By defrosting in a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0100] In some embodiments, the control unit 104 is further configured to: determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature threshold after the preset second time of defrosting ends; if the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature threshold, then under the second defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, open the first valve and the second valve.

[0101] Under the second defrost logic, if the defrost effect cannot be guaranteed by defrost mode one, then under the second defrost logic, defrost mode one is replaced with defrost mode two for defrost. Specifically, the preset second time can be set to 10 minutes, and the preset first temperature threshold can be set to -2°C. 10 minutes after frosting and defrosting, if the outdoor heat exchanger temperature is ≤-2°C, then under the second defrost logic, the valve opening and closing is controlled according to defrost mode two, that is, the first valve and the second valve are opened. By using a step-covering defrost mode, the defrost mode is automatically switched, and a defrost mode with a better defrost effect is used for defrosting to ensure a better defrost effect.

[0102] 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 operating speed of the compressor according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, and also includes: when the defrost logic of the air conditioner is the third defrost logic, judging whether the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, and judging whether the continuous operation time of the compressor is greater than the preset third time; the preset first temperature>the preset second temperature>the preset third temperature; the preset first time>the preset second time>the preset third time; if the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, opening the first valve and the second valve to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset third stop temperature, or the defrost time is greater than the preset third stop time, closing the second valve 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.

[0103] Under the third defrost logic, the outdoor temperature is very low, and it is considered that both the outdoor external heat exchanger and the outdoor internal heat exchanger need strong defrosting. The preset third temperature can be set to -10℃, and the preset third time can be set to 30min. When the temperature of the outdoor heat exchanger is less than -10℃, or the continuous operation time of the compressor is greater than 30min, the air conditioner starts to defrost, and controls the opening and closing of the first valve and the second valve in defrost mode 2, that is, opens the second valve and the first valve. The preset third stop temperature can be set to 4℃, and the preset third stop time can be set to 12min. During the defrost process, if the temperature of the outdoor heat exchanger is greater than 4℃, or the defrost time is greater than 12min, the defrost is stopped, and the first valve and the second valve are restored to the default opening and closing state.

[0104] In some embodiments, the control unit 104 is further configured to: determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold after a preset third time for defrosting to end; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, open the first valve and the second valve to start defrosting, and close the second valve after a preset third end time to end defrosting; if the temperature of the outdoor heat exchanger is greater than the preset second temperature threshold, open the first valve and the second valve to start defrosting, and close the second valve after a preset fourth end time to end defrosting; the preset third end time > the preset fourth end time.

[0105] Under the third defrost logic, after each defrost is completed, the air conditioner will enter the frost suppression stage to prevent the outdoor heat exchanger from frosting again. The preset third time can be set to 5 minutes, the preset second temperature threshold can be set to -6°C, the preset third end time can be set to 1.5 minutes, and the preset fourth end time can be set to 1 minute. 5 minutes after each defrost is completed, if the outdoor heat exchanger temperature is ≤-6°C, the air conditioner runs defrost mode 2 and lasts for 1.5 minutes; if the outdoor heat exchanger temperature is >-6°C, the air conditioner runs defrost mode 2 and lasts for 1 minute. By defrosting in a shorter time, the outdoor heat exchanger can be prevented from frosting again without affecting heating.

[0106] In some embodiments, the control unit 104 is further configured to: determine whether the temperature of the outdoor heat exchanger is less than or equal to a preset second temperature threshold after the preset fourth time of defrosting ends; if the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature threshold, then under the third defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, open the first valve and the second valve and increase the operating speed of the compressor.

[0107] Under the third defrost logic, if the defrost effect cannot be guaranteed by defrost mode 2, then under the third defrost logic, defrost mode 2 is replaced by defrost mode 3 for defrost. Specifically, the preset fourth time can be set to 10 minutes, and the preset second temperature threshold can be set to -6°C. 10 minutes after frosting and defrosting, if the outdoor heat exchanger temperature is ≤-6°C, then under the third defrost logic, the valve opening and closing is controlled according to defrost mode 3, that is, the first valve and the second valve are opened and the operating speed of the compressor is increased. By using a step-covering defrost mode, the defrost mode is automatically switched, and a defrost mode with a better defrost effect is used for defrosting to ensure a better defrost effect.

[0108] Figure 5 FIG. 1 is a flow chart of the defrosting control method of the air conditioner of the present invention, as shown in FIG. Figure 5 As shown, including:

[0109] Step 1: 5 minutes after the air conditioner is turned on for heating, determine the outdoor ambient temperature T1. If T1>2°C, execute step 2; if 2°C≥T1≥-4°C, execute step 3; if T1<-4°C, execute step 4.

[0110] Step 2, determine whether the outdoor heat exchanger temperature T2 ≤ -2 ° C, or whether the compressor continuous operation time t1 > 60min. If T2 ≤ -2 ° C, or t1 > 60min, execute defrost mode 1 (open the second solenoid valve, close the first solenoid valve) to defrost. During the defrost process, if T2 > 10 ° C or the defrost time t2 > 5min, end the defrost. Re-execute step 2 10 minutes after the end of defrost.

[0111] Step 3, determine whether the outdoor heat exchanger temperature T2 ≤ -6 ° C, or whether the compressor continuous operation time t1 > 45min. If T2 ≤ -6 ° C, or t1 > 45min, execute defrost mode 1 for defrosting. During the defrosting process, if T2 > 6 ° C or defrost time t2 > 8min, end the defrosting. After the defrosting is finished, execute steps 3.1 and 3.2 respectively.

[0112] Step 3.1, 8 minutes after the defrost is completed, if T2 ≤ -2°C, the defrost mode is executed for 1 minute; if T2 > -2°C, the defrost mode is executed for 0.5 minutes.

[0113] Step 3.2, 10 minutes after the defrosting is finished, if T2≤-2°C, then when executing step 3 and step 3.1, the defrost mode 1 is replaced with the defrost mode 2 (opening the first solenoid valve and the second solenoid valve).

[0114] Step 4, determine whether the outdoor heat exchanger temperature T2 ≤ -10 ° C, or whether the compressor continuous operation time t1 > 30min. If T2 ≤ -10 ° C, or t1 > 30min, execute defrost mode 2 for defrosting. During the defrosting process, if T2 > 4 ° C or defrost time t2 > 12min, end the defrosting. After the defrosting is finished, execute steps 4.1 and 4.2 respectively.

[0115] Step 4.1, 5 minutes after the defrost is completed, if T2 ≤ -6°C, execute defrost mode 2 and continue for 1.5 minutes; if T2 > -2°C, execute defrost mode 2 and continue for 1 minute.

[0116] Step 4.2, 10 minutes after the defrosting is completed, if T2≤-6°C, then when executing steps 4 and 4.1, replace defrost mode 2 with defrost mode 3 (open the first solenoid valve and the second solenoid valve, and increase the operating speed of the compressor).

[0117] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0118] According to the technical solution of the present invention, 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 external heat exchanger and an internal heat exchanger arranged in parallel, the internal heat exchanger is connected to the throttling component, the external heat exchanger is connected to the throttling component through a first valve, the exhaust port of the compressor passes through the first refrigerant flow path and the second valve in sequence and is connected to the pipeline between the external heat exchanger and the first 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 defrost logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve and the second valve and the operating speed of the compressor are controlled. Therefore, the defrost logic of the air conditioner defrosting without stopping is determined according to the outdoor ambient temperature, and the outdoor external heat exchanger and the outdoor internal 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 hot air matches the degree of frost, thereby improving the defrost efficiency. At the same time, the influence of excessive refrigerant bypassing by hot air on the heating effect is avoided, thereby ensuring the indoor comfort during defrosting.

[0119] According to an embodiment of the present invention, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner may include: the control device of the air conditioner described above.

[0120] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0121] According to the technical solution of the present invention, 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 external heat exchanger and an internal heat exchanger arranged in parallel, the internal heat exchanger is connected to the throttling component, the external heat exchanger is connected to the throttling component through a first valve, the exhaust port of the compressor passes through the first refrigerant flow path and the second valve in sequence and is connected to the pipeline between the external heat exchanger and the first 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 defrost logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve and the second valve and the operating speed of the compressor are controlled. Therefore, the defrost logic of the air conditioner defrosting without stopping is determined according to the outdoor ambient temperature, and the outdoor external heat exchanger and the outdoor internal 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 hot air matches the degree of frost, thereby improving the defrost efficiency. At the same time, the influence of excessive refrigerant bypassing by hot air on the heating effect is avoided, thereby ensuring the indoor comfort during defrosting.

[0122] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the air conditioner control method described above.

[0123] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0124] According to the technical solution of the present invention, 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 external heat exchanger and an internal heat exchanger arranged in parallel, the internal heat exchanger is connected to the throttling component, the external heat exchanger is connected to the throttling component through a first valve, the exhaust port of the compressor passes through the first refrigerant flow path and the second valve in sequence and is connected to the pipeline between the external heat exchanger and the first 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 defrost logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve and the second valve and the operating speed of the compressor are controlled. Therefore, the defrost logic of the air conditioner defrosting without stopping is determined according to the outdoor ambient temperature, and the outdoor external heat exchanger and the outdoor internal 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 hot air matches the degree of frost, thereby improving the defrost efficiency. At the same time, the influence of excessive refrigerant bypassing by hot air on the heating effect is avoided, thereby ensuring the indoor comfort during defrosting.

[0125] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner control method is also provided, wherein the computer program product comprises a computer program, and when the computer program product is processed and executed, the steps of the air conditioner control method are implemented.

[0126] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0127] According to the technical solution of the present invention, 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 external heat exchanger and an internal heat exchanger arranged in parallel, the internal heat exchanger is connected to the throttling component, the external heat exchanger is connected to the throttling component through a first valve, the exhaust port of the compressor passes through the first refrigerant flow path and the second valve in sequence and is connected to the pipeline between the external heat exchanger and the first 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 defrost logic of the air conditioner is determined according to the outdoor ambient temperature; according to the defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve and the second valve and the operating speed of the compressor are controlled. Therefore, the defrost logic of the air conditioner defrosting without stopping is determined according to the outdoor ambient temperature, and the outdoor external heat exchanger and the outdoor internal 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 hot air matches the degree of frost, thereby improving the defrost efficiency. At the same time, the influence of excessive refrigerant bypassing by hot air on the heating effect is avoided, thereby ensuring the indoor comfort during defrosting.

[0128] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0129] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: 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 external heat exchanger and an internal heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the internal heat exchanger is connected to the throttling component; the external 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 external heat exchanger and the first valve after passing through the first refrigerant flow path and the second valve in sequence; The second refrigerant flow path is located on the pipeline on 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, and the second valve is in a closed state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor are obtained; Determining the defrosting logic of the air conditioner according to the outdoor ambient temperature; The opening and closing of the first valve, the opening and closing of the second valve, and the operating 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.

2. The air conditioner control method according to claim 1, characterized in that: The defrost logic of the air conditioner includes: a first defrost logic, a second defrost logic, and a third defrost logic; Determining the defrosting logic of the air conditioner according to the outdoor ambient temperature includes: Determine the temperature range of the outdoor ambient 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 ambient temperature is within a first temperature range, determining that the defrost logic of the air conditioner is the first defrost logic; If the outdoor ambient temperature is within the second temperature range, determining that the defrost logic of the air conditioner is the second defrost logic; If the outdoor ambient temperature is within a third temperature range, the defrost logic of the air conditioner is determined to be the third defrost logic.

3. The air conditioner control method according to claim 2, characterized in that: According to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled, including: When the defrost logic of the air conditioner is the first defrost logic, determining whether the temperature of the outdoor heat exchanger is less than or equal to a preset first temperature, and determining whether the continuous operation time of the compressor is greater than a preset first time; If the temperature of the outdoor heat exchanger is less than or equal to the preset first temperature, or the continuous operation time of the compressor is greater than the preset first time, the second valve is opened and the first valve is closed to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset first stop temperature, or the defrost time is greater than the preset first stop time, the first valve is opened and the second valve is closed to end defrosting.

4. The air conditioner control method according to claim 2, characterized in that: According to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled, and the method further includes: When the defrost logic of the air conditioner is the second defrost 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 operation time of the compressor is greater than a preset second time; If the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, the second valve is opened and the first valve is closed to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset second stop temperature, or the defrost time is greater than the preset second stop time, the first valve is opened and the second valve is closed to end defrosting.

5. The air conditioner control method according to claim 4, characterized in that: Also includes: After the preset first time of defrosting ends, 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 a preset first temperature threshold, the second valve is opened and the first valve is closed to start defrosting, and after a preset first end time, 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 a first preset temperature threshold, the second valve is opened and the first valve is closed to start defrosting, and after a preset second end time, the second valve is closed and the first valve is opened to end defrosting; the preset first end time is greater than the preset second end time; and / or, After the preset second time of defrosting ends, 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset second temperature, or the continuous operation time of the compressor is greater than the preset second time, the first valve and the second valve are opened.

6. The air conditioner control method according to claim 2, characterized in that: According to the defrosting logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor, the opening and closing of the first valve, the opening and closing of the second valve, and the operating speed of the compressor are controlled, and the method further includes: When the defrost logic of the air conditioner is the third defrost 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 operation time of the compressor is greater than a preset third time; the preset first temperature> the preset second temperature> the preset third temperature; the preset first time> the preset second time> the preset third time; If the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, the first valve and the second valve are opened to start defrosting; thereafter, if the temperature of the outdoor heat exchanger is greater than the preset third stop temperature, or the defrosting time is greater than the 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 air conditioner control method according to claim 6, characterized in that: Also includes: After the defrosting is finished for a preset third time, 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 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 after a preset fourth end time to end defrosting; the preset third end time> the preset fourth end time; and / or, After the preset fourth time of defrosting ends, 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 defrost logic, when the temperature of the outdoor heat exchanger is less than or equal to the preset third temperature, or the continuous operation time of the compressor is greater than the preset third time, the first valve and the second valve are opened and the operating speed of the compressor is increased.

8. A control device for an air conditioner, characterized in that: 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 external heat exchanger and an internal heat exchanger arranged in parallel; the coil heat exchanger has a first refrigerant flow path and a second refrigerant flow path; the internal heat exchanger is connected to the throttling component; the external 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 external heat exchanger and the first valve after passing through the first refrigerant flow path and the second valve in sequence; The second refrigerant flow path is located on the pipeline on the suction side of the compressor; The device comprises: An acquisition unit is configured to acquire the outdoor ambient temperature, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor when the air conditioner is in heating operation and the first valve is in an open state and the second valve is in a closed state; a control unit configured to determine a defrosting logic of the air conditioner according to the outdoor ambient temperature; The control unit is further 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 defrost logic, the temperature of the outdoor heat exchanger, and the continuous operation time of the compressor.

9. An air conditioner, characterized in that: include: The air conditioner control device as claimed in claim 8.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air conditioner control method according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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