Startup control method of air conditioner

Abstract

The present invention relates to the technical field of air conditioning, and in particular to a startup control method for an air conditioner. The present application aims to solve the problem that the existing compressor sets a waiting time at startup to prevent excessive load, which leads to a slow startup speed. To this end, the outdoor heat exchanger of the air conditioner of the present application includes a plurality of heat exchange pipe sections and an on-off valve group. The on-off valve group can control the connection form between the heat exchange pipe sections. The startup control method includes: after obtaining the compressor start signal, controlling the compressor to start, and obtaining the high pressure and low pressure of the air conditioner; calculating the first ratio of the high pressure to the low pressure; determining the opening and closing mode of the on-off valve group based on the interval where the first ratio is located; and controlling the action of the on-off valve group based on the opening and closing mode. The present application can detect the startup load in real time, and realize adaptive variable flow control of the system pressure ratio based on the detection result, to ensure that the compressor starts quickly and effectively.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a startup control method for an air conditioner. Background Art

[0002] The compressor is a core functional component in an air conditioner, and its operational stability directly determines the overall stability of the air conditioner. Typically, if the compressor needs to be restarted immediately, such as during initial startup, mode switching, or when the air conditioner shuts down due to reaching a certain temperature, the compressor will fail to start due to excessive load, triggering power module overload protection or even burning out the compressor.

[0003] To prevent situations such as inability to start or failure to start due to excessive load, the existing technology usually requires waiting for a period of time after receiving the power-on signal, first controlling the start of the outdoor fan and the operation of the throttle valve, so that the air-conditioning system reaches a certain balance ratio before starting the compressor.

[0004] However, this control method will obviously cause the air conditioner to start up more slowly, which is not conducive to improving the user experience.

[0005] Accordingly, this field requires a new technical solution to solve the above problems. Summary of the Invention

[0006] In order to solve at least one of the above-mentioned problems in the prior art, that is, to solve the problem that the existing compressor sets a waiting time during startup to prevent excessive load, resulting in a slow startup speed, the present application provides a startup control method for an air conditioner, wherein the air conditioner includes a compressor, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger connected by a refrigerant pipeline, the outdoor heat exchanger includes a plurality of heat exchange pipe sections, and an on-off valve group is further provided in the outdoor heat exchanger, the on-off valve group includes a plurality of on-off valves, and the on-off valve group is configured to control the communication between the plurality of heat exchange pipe sections.

[0007] The startup control method includes:

[0008] After receiving a compressor start signal, controlling the compressor to start, and obtaining the high pressure and low pressure of the air conditioner;

[0009] calculating a first ratio of the high pressure to the low pressure;

[0010] determining an opening and closing mode of the on-off valve group based on the interval in which the first ratio is located;

[0011] Based on the opening and closing mode, the action of the on-off valve group is controlled.

[0012] In the preferred technical solution of the above-mentioned start-up control method of the air conditioner, the outdoor heat exchanger includes a first heat exchange pipe section, a second heat exchange pipe section and a third heat exchange pipe section connected in sequence, and the outdoor heat exchanger also includes a first branch pipe, a second branch pipe and a third branch pipe, the first end of the first branch pipe is connected to the refrigerant pipeline between the compressor and the first heat exchange pipe section, the second end of the first branch pipe is connected to the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section, one end of the second branch pipe is connected to the third branch pipe, the second end of the second branch pipe is connected to an end of the third heat exchange pipe section close to the second heat exchange pipe section, the first end of the third branch pipe is connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, the second end of the third branch pipe is connected to the refrigerant pipeline between the third heat exchange pipe section and the throttling device,

[0013] The on-off valve group includes a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve. The first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and is located between the second end of the first branch pipe and the third heat exchange pipe section, the third on-off valve is arranged on the second branch pipe, and the fourth on-off valve is arranged on the third branch pipe and is located between the first end of the second branch pipe and the second end of the third branch pipe.

[0014] In the preferred technical solution of the above-mentioned air conditioner startup control method, the step of "determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located" further includes:

[0015] If the first ratio is less than or equal to a first preset threshold, determining that the opening and closing mode of the on-off valve group is the first mode;

[0016] The first mode is as follows: the first on-off valve, the third on-off valve and the fourth on-off valve are closed, and the second on-off valve is opened.

[0017] In the preferred technical solution of the above-mentioned air conditioner startup control method, the step of "determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located" further includes:

[0018] If the first ratio is greater than the first preset threshold and less than or equal to the second preset threshold, determining that the opening and closing mode of the on-off valve group is the second mode;

[0019] The second mode is as follows: the first on-off valve and the third on-off valve are open, and the second on-off valve and the fourth on-off valve are closed.

[0020] In the preferred technical solution of the above-mentioned air conditioner startup control method, the step of "determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located" further includes:

[0021] If the first ratio is greater than the second preset threshold and less than or equal to a third preset threshold, determining that the opening and closing mode of the on-off valve group is the third mode;

[0022] The third mode is as follows: the first on-off valve, the second on-off valve and the third on-off valve are open, and the fourth on-off valve is closed.

[0023] In the preferred technical solution of the above-mentioned air conditioner startup control method, the step of "determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located" further includes:

[0024] If the first ratio is greater than the third preset threshold, determining that the opening and closing mode of the on-off valve group is the fourth mode;

[0025] The fourth mode is as follows: the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all open.

[0026] In the preferred technical solution of the startup control method of the air conditioner, after the step of "controlling the on-off valve group to operate in the fourth mode", the startup control method further includes:

[0027] Continuously obtaining the high pressure and low pressure of the air conditioner;

[0028] calculating a third ratio of the high pressure to the low pressure;

[0029] comparing the third ratio with the third preset threshold;

[0030] The compressor is selectively controlled to stop according to the comparison result.

[0031] In the preferred technical solution of the above-mentioned air conditioner startup control method, the step of "selectively controlling the compressor to start according to the comparison result" further includes:

[0032] If the third ratio is greater than the third preset threshold, the compressor is controlled to stop, and the indoor fan and the outdoor fan are controlled to start, until the third ratio is less than or equal to the third preset threshold, and the compressor is controlled to restart.

[0033] In the preferred technical solution of the above-mentioned air conditioner startup control method, the startup control method further includes:

[0034] After controlling the compressor to start, obtaining a plurality of high pressures and a plurality of low pressures of the air conditioner;

[0035] calculating a pressure ratio change rate of the air conditioner based on the plurality of high pressures and the plurality of low pressures;

[0036] comparing the pressure ratio change rate with a preset pressure ratio threshold;

[0037] When the pressure ratio change rate is less than the preset pressure ratio threshold, the on-off valve group is controlled to switch to the open and closed state before the compressor is started.

[0038] In the preferred technical solution of the above-mentioned air conditioner startup control method, the step of "obtaining the high pressure and low pressure of the air conditioner" further includes:

[0039] The maximum value of the high pressure and the maximum value of the low pressure within a preset time period are obtained.

[0040] The startup control method of the present application obtains the high-pressure and low-pressure of the air conditioner when the compressor is started, and then adjusts the opening and closing mode of the on-off valve group based on a first ratio of the two. It can detect the startup load in real time and implement adaptive variable flow control of the system pressure ratio based on the detection results to ensure that the compressor starts quickly and effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present application is described below with reference to the accompanying drawings.

[0042] Figure 1 A system diagram of the air conditioner of this application;

[0043] Figure 2 A flowchart of the startup control method of the air conditioner of the present application;

[0044] Figure 3 This is a logic diagram of a possible implementation of the startup control method of the air conditioner of the present application.

[0045] Reference Signs List

[0046] 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 31. First heat exchange pipe section; 32. Second heat exchange pipe section; 33. Third heat exchange pipe section; 4. Throttling device; 5. Indoor heat exchanger; 6. Refrigerant pipeline; 71. First branch pipe; 72. Second branch pipe; 73. Third branch pipe; 81. First on-off valve; 82. Second on-off valve; 83. Third on-off valve; 84. Fourth on-off valve. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, in the following embodiments, although the various steps are described in the aforementioned order, it will be understood by those skilled in the art that in order to achieve the effect of the present embodiment, the different steps do not have to be performed in such an order, and they can be performed simultaneously (in parallel) or in a reversed order, and these simple changes are all within the scope of protection of the present application.

[0048] It should be noted that, in the description of this application, the terms "upper" and "lower" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of this application. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, "multiple" refers to at least two.

[0049] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0050] First refer to Figure 1 , the air conditioner of this application is described. Figure 1 As shown, in order to solve the problem that the existing compressor sets a waiting time at startup to prevent excessive load, which leads to a slow startup speed, the air conditioner of the present application includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4 and an indoor heat exchanger 5. Among them, the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the first throttling device 4 and the indoor heat exchanger 5 are connected in sequence through the refrigerant pipeline 6 to form a refrigerant circulation. Preferably, the indoor heat exchanger 5 has an inner exhaust pipeline and an outer exhaust pipeline, which are arranged in parallel. The first throttling device 4 is an electronic expansion valve. The above-mentioned connection method and the working principle of the air conditioner are conventional technical means in this field and will not be repeated in this application.

[0051] In particular, the outdoor heat exchanger 3 of the present application includes multiple heat exchange pipe sections, and an on-off valve group is also provided in the outdoor heat exchanger 3. The on-off valve group includes multiple on-off valves, and the on-off valve group is configured to control the connection between the multiple heat exchange pipe sections.

[0052] Preferably, the outdoor heat exchanger 3 includes a first heat exchange section 31, a second heat exchange section 32, and a third heat exchange section 33, which are connected in sequence. The first heat exchange section 31 is located in the middle of the outdoor heat exchanger 3, the second heat exchange section 32 is located above the first heat exchange section 31, and the third heat exchange section 33 is located below the first heat exchange section 31. One end of the first heat exchange section 31 is connected to the exhaust port of the compressor 1 via the refrigerant pipeline 6. The other end of the first heat exchange section 31 is connected to one end of the second heat exchange section 32 via the refrigerant pipeline 6. The other end of the second heat exchange section 32 is connected to one end of the third heat exchange section 33 via the refrigerant pipeline 6. The other end of the third heat exchange section 33 is connected to the throttling device 4 via the refrigerant pipeline 6.

[0053] The outdoor heat exchanger 3 further includes a first branch pipe 71, a second branch pipe 72, and a third branch pipe 73. The first end of the first branch pipe 71 is connected to the refrigerant pipeline 6 between the compressor 1 and the first heat exchange pipe section 31, and the second end of the first branch pipe 71 is connected to the refrigerant pipeline 6 between the second heat exchange pipe section 32 and the third heat exchange pipe section 33. The first end of the second branch pipe 72 is connected to the third branch pipe 73, and the second end of the second branch pipe 72 is connected to the end of the third heat exchange pipe section 33 closest to the second heat exchange pipe section 32 (i.e., the end of the third heat exchange pipe section 33 connected to the second heat exchange pipe section 32). The first end of the third branch pipe 73 is connected to the refrigerant pipeline 6 between the first heat exchange pipe section 31 and the second heat exchange pipe section 32, and the second end of the third branch pipe 73 is connected to the refrigerant pipeline 6 between the third heat exchange pipe section 33 and the throttling device 4.

[0054] The on-off valve assembly includes a first on-off valve 81, a second on-off valve 82, a third on-off valve 83, and a fourth on-off valve 84. The first on-off valve 81 is disposed on the first branch pipe 71, the second on-off valve 82 is disposed on the refrigerant pipeline 6 between the second heat exchange pipe section 32 and the third heat exchange pipe section 33, and is located between the second end of the first branch pipe 71 and the third heat exchange pipe section 33. The third on-off valve 83 is disposed on the second branch pipe 72, and the fourth on-off valve 84 is disposed on the third branch pipe 73 and is located between the first end of the second branch pipe 72 and the second end of the third branch pipe 73.

[0055] Under the above-mentioned setting method, by controlling the opening and closing of the first on-off valve 81, the second on-off valve 82, the third on-off valve 83 and the fourth on-off valve 84, different connection forms of the first heat exchange pipe section 31, the second heat exchange pipe section 32 and the third heat exchange pipe section 33 can be achieved, thereby achieving different heat exchange effects of the outdoor heat exchanger 3.

[0056] Those skilled in the art will understand that the above-described configuration of the air conditioner is merely a preferred embodiment. Without departing from the principles of this application, those skilled in the art may adjust the structure of the above-described air conditioner to adapt the application to more specific application scenarios. For example, although the above-described air conditioner is described in conjunction with a four-way valve 2, this embodiment is not set in stone. In other embodiments, those skilled in the art may selectively omit the four-way valve 2, converting the air conditioner into a heating-only air conditioner. Furthermore, the specific form of the first throttling device 4 is not limited in this application; the first throttling device 4 may also be a capillary tube or a thermal expansion valve. Furthermore, although the above-described outdoor heat exchanger 3 is described in conjunction with a main heat exchange section and an auxiliary heat exchange section, the specific structure of the outdoor heat exchanger 3 is not set in stone. Those skilled in the art may modify it, such as including only the main heat exchange section and omitting the auxiliary heat exchange section. Furthermore, the number and configuration of the heat exchange sections of the outdoor heat exchanger 3, the number and connection configuration of the branch pipes, the number and location of the on-off valves in the on-off valve assembly, and other aspects of the invention may be adjusted by those skilled in the art to adapt the application to more specific application scenarios. For example, those skilled in the art may increase or decrease the number, location, or connection method of the heat exchange pipe segments; or increase or decrease the number of branch pipes and their connection relationships; or increase or decrease the number and location of on-off valves. In short, as long as the connection method of the heat exchange pipe segments can be adjusted by controlling the opening and closing of the on-off valves in the on-off valve group, such changes do not deviate from the principles of the present application.

[0057] Refer to the following Figure 2 , the startup control method of the air conditioner of this application is introduced.

[0058] like Figure 2 As shown, corresponding to the above air conditioner, the startup control method of the air conditioner of the present application includes:

[0059] S101: After receiving a compressor start signal, the compressor is controlled to start and the high pressure and low pressure of the air conditioner are obtained. For example, after receiving the compressor start signal, the compressor is controlled to start and the high pressure and low pressure of the air conditioner are immediately obtained. The high pressure can be obtained by a pressure sensor located at the compressor exhaust port, and the low pressure can be obtained by a pressure sensor located at the compressor intake port.

[0060] S103: Calculate a first ratio of the high pressure to the low pressure. For example, after obtaining the high pressure and the low pressure, divide the high pressure by the low pressure to calculate the first ratio between the two.

[0061] S105: Determine an opening and closing mode of the on-off valve group based on the interval within which the first ratio falls. For example, after calculating the first ratio, the high and low pressure ratios of the air conditioning system can be obtained. The high and low pressure ratios can be used to determine the current system pressure ratio, and thus, the opening and closing mode of the on-off valve group suitable for the current situation can be determined based on the pressure ratio. By adjusting the opening and closing mode of the on-off valve group, the pressure ratio of the system can be adjusted.

[0062] S107, based on the opening and closing mode, controlling the operation of the on-off valve group. For example, after determining the opening and closing mode of the on-off valve group, controlling each on-off valve in the on-off valve group to be switched on and off according to the opening and closing mode.

[0063] The startup control method of the present application obtains the high-pressure and low-pressure of the air conditioner when the compressor is started, and then adjusts the opening and closing mode of the on-off valve group based on a first ratio of the two. It can detect the startup load in real time and implement adaptive variable flow control of the system pressure ratio based on the detection results to ensure that the compressor starts quickly and effectively.

[0064] The preferred implementation of this application is introduced below.

[0065] In one embodiment, the on-off valve group of the present application has an opening and closing mode including a first mode, a second mode, a third mode and a fourth mode.

[0066] In the first mode, the first, third, and fourth on-off valves are closed, and the second on-off valve is open. Thus, during operation, refrigerant is discharged from the compressor and passes through the four-way valve. It then enters the first heat exchange segment from the upper portion of the first heat exchange segment, is discharged from the lower portion of the first heat exchange segment, and enters the second heat exchange segment from the lower portion of the second heat exchange segment. It then exits through the upper portion of the second heat exchange segment and enters the third heat exchange segment from the upper portion of the third heat exchange segment. Finally, it exits through the lower portion of the third heat exchange segment to the throttling device. In other words, the refrigerant passes through the first, second, and third heat exchange segments in sequence.

[0067] In the second mode, the first and third on-off valves are open, while the second and fourth on-off valves are closed. Thus, during operation, the refrigerant discharged from the compressor and passing through the four-way valve is split into two parts: one portion enters the first heat exchange segment through the upper portion of the first heat exchange segment and is discharged from the lower portion of the first heat exchange segment, while the other portion enters the second heat exchange segment through the upper portion of the second heat exchange segment and is discharged from the lower portion of the second heat exchange segment. The refrigerants discharged from the first and second heat exchange segments merge and then enter the third heat exchange segment through the upper portion of the third heat exchange segment, finally being discharged from the lower portion of the third heat exchange segment to the throttling device.

[0068] In the third mode, the first, second, and third on-off valves are open, and the fourth on-off valve is closed. Thus, during operation, the refrigerant discharged from the compressor and passing through the four-way valve is split into two. The first portion of the refrigerant enters the first heat exchange segment through the upper portion of the first heat exchange segment and is discharged from the lower portion of the first heat exchange segment. The second portion of the refrigerant is further split into two, with a small portion entering the second heat exchange segment through the upper portion of the second heat exchange segment and being discharged from the lower portion of the second heat exchange segment, while the majority of the refrigerant directly reaches the third heat exchange segment. The refrigerant discharged from the first and second heat exchange segments merges with the refrigerant reaching the third heat exchange segment, and then both enter the third heat exchange segment through the upper portion of the third heat exchange segment and are finally discharged from the lower portion of the third heat exchange segment to the throttling device.

[0069] In the fourth mode, the first, second, third, and fourth on-off valves are all open. Thus, during operation, after the refrigerant is discharged from the compressor and passes through the four-way valve, it is split into two parts. The first part of the refrigerant enters the first heat exchange section through the upper portion of the first heat exchange section, is discharged from the lower portion of the first heat exchange section, and directly reaches the third branch pipe. The second part of the refrigerant is further split into two parts. A small part of the refrigerant enters the second heat exchange section through the upper portion of the second heat exchange section, is discharged from the lower portion of the second heat exchange section, and directly reaches the third branch pipe, while the majority of the refrigerant directly reaches the third branch pipe. The refrigerant discharged from the first and second heat exchange sections merges with the refrigerant that directly reaches the third branch pipe, and then flows together through the third branch pipe to the throttling device.

[0070] Of course, the four opening and closing modes in this application are merely preferred, and those skilled in the art can make adjustments based on specific application scenarios, such as adding or deleting opening and closing modes.

[0071] In one embodiment, the step of "determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located" further includes: if the first ratio is less than or equal to the first preset threshold, the opening and closing mode of the on-off valve group is determined to be the first mode; if the first ratio is greater than the first preset threshold and less than or equal to the second preset threshold, the opening and closing mode of the on-off valve group is determined to be the second mode; if the first ratio is greater than the second preset threshold and less than or equal to the third preset threshold, the opening and closing mode of the on-off valve group is determined to be the third mode; if the first ratio is greater than the third preset threshold, the opening and closing mode of the on-off valve group is determined to be the fourth mode.

[0072] Specifically, in this application, the first preset threshold value is 1, the second preset threshold value is 1.5, and the third preset threshold value is 2 as an example for explanation. After calculating the first ratio of high pressure to low pressure, the interval in which the first ratio is located is determined. Assuming that the first ratio is K1, if K1≤1, it proves that the high and low pressure ratios of the air conditioner are relatively small at this time, and the system load is relatively small. It is only necessary to appropriately adjust the high and low pressure ratios of the system. At this time, the on-off valve group is controlled to operate in the first mode. If 1<K1≤1.5, it proves that the high and low pressure ratios of the air conditioner have increased and the system load has increased. At this time, the on-off valve group is controlled to operate in the second mode, reducing the heat exchange effect of the outdoor heat exchanger and increasing the low pressure to appropriately reduce the system load. If 1.5<K1≤2, it proves that the high and low pressure ratios of the air conditioner are relatively large at this time, and the system load further increases. At this time, the on-off valve group is controlled to operate in the third mode, further reducing the heat exchange effect of the outdoor heat exchanger, thereby increasing the low pressure and reducing the system load. If K1>2, the high and low pressures of the air conditioner are relatively high, the system load is at a high level, and the compressor is at a greater risk. At this time, the on-off valve group is controlled to operate in the fourth mode to minimize the heat exchange of the outdoor heat exchanger, quickly increase the low pressure, and reduce the system load.

[0073] By controlling the opening and closing mode of the on-off valve group based on the first ratio, the present application can achieve adaptive adjustment of the high and low pressure ratios of the system with high adjustment accuracy, which is conducive to rapid startup of the compressor under different startup conditions.

[0074] Of course, the specific values ​​of the first preset threshold, the second preset threshold and the third preset threshold are only exemplary. Those skilled in the art can adjust them based on specific application scenarios, and such adjustments do not deviate from the principles of this application.

[0075] In one embodiment, after the step of "controlling the on-off valve group to operate in the fourth mode," the startup control method further includes: continuously obtaining the high pressure and low pressure of the air conditioner; calculating a third ratio of the high pressure to the low pressure; comparing the third ratio with a third preset threshold; and selectively controlling the compressor to stop based on the comparison result. Specifically, the step of "selectively controlling the compressor to start based on the comparison result" further includes: if the third ratio is greater than the third preset threshold, controlling the compressor to stop and controlling the indoor and outdoor fans to start until the third ratio is less than or equal to the third preset threshold, at which time controlling the compressor to restart.

[0076] For example, when the on-off valve group operates in the fourth mode, it proves that the air conditioner is in a high-pressure ratio state, and the system risk is relatively high. Therefore, in addition to quickly reducing the system pressure ratio, the air conditioner needs to be safety monitored at this time. Therefore, after controlling the on-off valve group to operate in the fourth mode, the present application continuously obtains the high-pressure and low-pressure of the air conditioner, calculates the third ratio between the two, and continues to compare with the third preset threshold. Taking the third ratio as K3 and the third preset threshold as 2 as an example, if K3>2, it proves that the air conditioner is continuously in a high-pressure ratio state at this time, which poses a relatively high risk to the air conditioner. Therefore, the compressor is first controlled to shut down to avoid compressor failure. In addition, at this time, the indoor fan and outdoor fan are first turned on and started to balance the high and low pressure ratios of the system. During this period, the high and low pressure ratios of the system are continuously detected until K3≤2 is satisfied, and the compressor is controlled to restart. Conversely, if the third ratio is less than or equal to the third preset threshold, it proves that the high and low pressure ratios of the system have decreased in the fourth mode. At this time, the risk of compressor failure is reduced, and the compressor can be kept running.

[0077] Through the above control method, when the system high and low pressure ratios are high, the high and low pressure ratios can be continuously monitored to achieve safety monitoring of the compressor, thereby improving system safety and preventing compressor failures.

[0078] Of course, the above control method is merely a preferred method and can be adjusted by those skilled in the art. For example, the entire step of determining the third pressure ratio can be omitted. Alternatively, those skilled in the art can adjust the specific control method after the compressor stops, such as controlling only the indoor fan or only the outdoor fan.

[0079] In one embodiment, the startup control method further includes: after controlling the compressor to start, obtaining multiple high-pressure pressures and multiple low-pressure pressures of the air conditioner; calculating the pressure ratio change rate of the air conditioner based on the multiple high-pressure pressures and multiple low-pressure pressures; comparing the pressure ratio change rate with a preset pressure ratio threshold; when the pressure ratio change rate is less than the preset pressure ratio threshold, controlling the on-off valve group to switch to the open and closed state before the compressor is started.

[0080] Specifically, regardless of the mode in which the on-off valve assembly operates, once the compressor starts and runs smoothly, the air conditioner needs to be controlled to resume normal operation to improve operating efficiency. In this application, the high and low pressures of multiple air conditioners are sequentially acquired, for example, every 5 or 15 seconds, and then the rate of change of the high and low pressure ratio (i.e., the ratio of the subsequent high and low pressure ratio to the previous high and low pressure ratio) is calculated to determine whether the compressor is operating smoothly. The preset pressure ratio threshold can be 0.1. In other words, when the pressure ratio change rate is less than 0.1, it indicates that the compressor is operating smoothly. The on-off valve assembly can be controlled to switch back to the state before the compressor started, achieving normal operation of the air conditioner. For example, if the on-off valve assembly is in the first mode before the compressor starts, then when the pressure ratio change rate is less than 0.1, the on-off valve assembly is controlled to switch back to the first mode. If the on-off valve assembly is in another state, the on-off valve assembly is controlled to switch back to that state accordingly.

[0081] Of course, the above control method is merely a preferred method and can be modified by those skilled in the art. For example, the on-off valve group can be switched to the on-off state corresponding to the current air conditioner operating mode. In addition, the specific values ​​of the interval duration and the preset pressure ratio threshold are merely exemplary and can be modified by those skilled in the art.

[0082] In one embodiment, the step of "obtaining the high pressure and the low pressure of the air conditioner" further includes: obtaining the maximum value of the high pressure and the maximum value of the low pressure within a preset time period.

[0083] For example, the preset time length can be any value between 2-10s. Taking 5s as an example, when obtaining the high pressure and low pressure of the air conditioner, the detection is continued for 5s to obtain the maximum value of the high pressure and the maximum value of the low pressure within these 5s to calculate the high and low pressure ratio of the air conditioner to ensure the stability of the calculation results.

[0084] Of course, the above steps are not necessary, and those skilled in the art may selectively omit the steps. In addition, those skilled in the art may adjust the preset duration based on specific scenarios.

[0085] The following combination Figure 3 , a possible implementation process of this application is introduced.

[0086] like Figure 3 As shown, in one possible operation process:

[0087] S201, after receiving the compressor start signal, the compressor starts to run, and at the same time obtains the high pressure Pcon and low pressure Peva of the air conditioner, and then executes S202.

[0088] S202, calculate K1 = Pcon / Peva.

[0089] S203: If K1≤1, control the on-off valve group to switch to the first mode.

[0090] S204: If 1<K1≤1.5, control the on-off valve group to switch to the second mode.

[0091] S205 , if 1.5<K1≤2, then control the on-off valve group to switch to the third mode.

[0092] S206: If K1>2, the on-off valve group is controlled to switch to the fourth mode, and then S207 is executed.

[0093] S207 , obtaining the high pressure Pcon and the low pressure Peva of the air conditioner again, and calculating K3 = Pcon / Peva, and then executing S208 .

[0094] S208, determine whether K3>2 is true. If so, execute S209; otherwise, execute S210.

[0095] S209: Control the compressor to stop, and control the indoor fan and the outdoor fan to start running, and then return to continue executing S207.

[0096] S210, controlling the operation of the compressor.

[0097] It should be noted that although the detailed steps of the method of the present application are described in detail above, without departing from the basic principles of the present application, technical personnel in this field can combine, split and change the order of the above steps. The modified technical solution does not change the basic concept of the present application and therefore falls within the scope of protection of the present application.

[0098] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.

[0099] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A startup control method for an air conditioner, characterized in that: The air conditioner includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected by a refrigerant pipeline. The outdoor heat exchanger includes a plurality of heat exchange pipe sections. An on-off valve group is also provided in the outdoor heat exchanger. The on-off valve group includes a plurality of on-off valves. The on-off valve group is configured to control the communication between the plurality of heat exchange pipe sections. The startup control method includes: After receiving a compressor start signal, controlling the compressor to start, and obtaining the high pressure and low pressure of the air conditioner; calculating a first ratio of the high pressure to the low pressure; determining an opening and closing mode of the on-off valve group based on the interval in which the first ratio is located; Based on the opening and closing mode, controlling the action of the on-off valve group; The outdoor heat exchanger includes a first heat exchange pipe section, a second heat exchange pipe section and a third heat exchange pipe section connected in sequence, and the outdoor heat exchanger also includes a first branch pipe, a second branch pipe and a third branch pipe, a first end of the first branch pipe is connected to the refrigerant pipeline between the compressor and the first heat exchange pipe section, a second end of the first branch pipe is connected to the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section, a first end of the second branch pipe is connected to the third branch pipe, a second end of the second branch pipe is connected to an end of the third heat exchange pipe section close to the second heat exchange pipe section, a first end of the third branch pipe is connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, and a second end of the third branch pipe is connected to the refrigerant pipeline between the third heat exchange pipe section and the throttling device. The on-off valve group includes a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve, wherein the first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and is located between the second end of the first branch pipe and the third heat exchange pipe section, the third on-off valve is arranged on the second branch pipe, and the fourth on-off valve is arranged on the third branch pipe and is located between the first end of the second branch pipe and the second end of the third branch pipe; The step of “determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located” further includes: If the first ratio is less than or equal to a first preset threshold, determining that the opening and closing mode of the on-off valve group is the first mode; The first mode is: the first on-off valve, the third on-off valve and the fourth on-off valve are closed, and the second on-off valve is open; The startup control method further includes: After controlling the compressor to start, obtaining a plurality of high pressures and a plurality of low pressures of the air conditioner; calculating a pressure ratio change rate of the air conditioner based on the plurality of high pressures and the plurality of low pressures; comparing the pressure ratio change rate with a preset pressure ratio threshold; When the pressure ratio change rate is less than the preset pressure ratio threshold, the on-off valve group is controlled to switch to the open and closed state before the compressor is started.

2. The startup control method of the air conditioner according to claim 1, characterized in that: The step of “determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located” further includes: If the first ratio is greater than the first preset threshold and less than or equal to the second preset threshold, determining that the opening and closing mode of the on-off valve group is the second mode; The second mode is as follows: the first on-off valve and the third on-off valve are open, and the second on-off valve and the fourth on-off valve are closed.

3. The startup control method of the air conditioner according to claim 2, characterized in that: The step of “determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located” further includes: If the first ratio is greater than the second preset threshold and less than or equal to a third preset threshold, determining that the opening and closing mode of the on-off valve group is the third mode; The third mode is as follows: the first on-off valve, the second on-off valve and the third on-off valve are open, and the fourth on-off valve is closed.

4. The startup control method of the air conditioner according to claim 3, characterized in that: The step of “determining the opening and closing mode of the on-off valve group based on the interval in which the first ratio is located” further includes: If the first ratio is greater than the third preset threshold, determining that the opening and closing mode of the on-off valve group is the fourth mode; The fourth mode is as follows: the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all open.

5. The startup control method of the air conditioner according to claim 4, characterized in that: After the step of "controlling the on-off valve group to operate in the fourth mode", the startup control method further includes: Continuously obtaining the high pressure and low pressure of the air conditioner; calculating a third ratio of the high pressure to the low pressure; comparing the third ratio with the third preset threshold; The compressor is selectively controlled to stop according to the comparison result.

6. The startup control method of the air conditioner according to claim 5, characterized in that: The step of “selectively controlling the compressor to stop according to the comparison result” further includes: If the third ratio is greater than the third preset threshold, the compressor is controlled to stop, and the indoor fan and the outdoor fan are controlled to start, until the third ratio is less than or equal to the third preset threshold, and the compressor is controlled to restart.

7. The startup control method of the air conditioner according to claim 1, characterized in that: The step of "obtaining the high pressure and low pressure of the air conditioner" further includes: The maximum value of the high pressure and the maximum value of the low pressure within a preset time period are obtained.

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