An air conditioning heating control system, method and air conditioner

Abstract

Embodiments of the present application provide an air conditioner heating control system, method and air conditioner, and relate to the technical field of air conditioners. The air conditioner heating control system provided by the present application can determine whether the refrigerant oil in the refrigerant pipeline is blocked when the air conditioner reaches a preset condition and performs heating operation. In the case of blockage, the valve mechanism and the heat exchange mechanism heat part of the refrigerant pipeline, thereby causing the refrigerant oil to flow back, so that the present application can effectively ensure the heating effect of the air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner heating control system, method and air conditioner. BACKGROUND

[0002] Air conditioners are commonly used electrical appliances in people's lives. Currently, when the air conditioner on the market is in heating operation, the outdoor unit of the air conditioner will frost on the heat exchanger due to the lengthening of the operation time. When the frost layer thickens, the air conditioner outdoor unit will perform defrosting operation. After the defrosting operation is completed, the air conditioner is restarted and operates according to the original starting mode.

[0003] However, at this time, the air conditioner may appear the case that the refrigeration oil is precipitated from the refrigerant to block the electronic expansion valve. This phenomenon will cause the lubricating oil to be unable to return to the compressor, thereby affecting the heating effect of the air conditioner. SUMMARY

[0004] The purposes of the present application include, for example, providing an air conditioner heating control system, method and air conditioner which can at least partially solve the above technical problems.

[0005] Embodiments of the present application can be implemented as follows:

[0006] In a first aspect, an air conditioner heating control system is provided according to an embodiment of the present application, which is applied to an air conditioner. The air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger and an outdoor heat exchanger. A first refrigerant branch is led out from the outlet of the exhaust pipe of the compressor. The first refrigerant branch converges at the gas-liquid separator of the compressor. An electronic expansion valve is arranged on the refrigerant main pipeline between the indoor heat exchanger and the outdoor heat exchanger. A second refrigerant branch is led out from the refrigerant main pipeline. The second refrigerant branch diverges / converges at the inlet / outlet of the electronic expansion valve, respectively. The air conditioner heating control system comprises a heat exchange mechanism, a sensing mechanism, a valve mechanism and a control mechanism. The control mechanism comprises a controller which is communicatively connected with the heat exchange mechanism, the sensing mechanism and the valve mechanism, respectively.

[0007] The heat exchange mechanism is connected to the first refrigerant branch and the second refrigerant branch, respectively, for heating the refrigerant flowing through the second refrigerant branch by the refrigerant in the first refrigerant branch.

[0008] The sensing mechanism is arranged on the refrigerant main pipeline where the electronic expansion valve is located, for detecting the pressure in the refrigerant main pipeline at the inlet and outlet of the electronic expansion valve.

[0009] The valve mechanism is arranged on the refrigerant main pipeline, the first refrigerant branch and the second refrigerant branch, for controlling the on-off state of the first refrigerant branch and the second refrigerant branch.

[0010] The controller is configured to acquire pressure data detected by the sensing mechanism, and control operating states of the heat exchange mechanism and the valve mechanism according to the pressure data, so as to control on-off states of the main refrigerant pipeline, the first refrigerant branch pipeline and the second refrigerant branch pipeline, and realize heating of the electronic expansion valve by the refrigerant.

[0011] Optionally, the heat exchange mechanism comprises a plate heat exchanger, and the plate heat exchanger comprises a first refrigerant inlet, a second refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet.

[0012] The first refrigerant inlet and the first refrigerant outlet are connected with the first refrigerant branch pipeline respectively.

[0013] The second refrigerant inlet and the second refrigerant outlet are connected with the second refrigerant branch pipeline respectively.

[0014] Optionally, the valve mechanism comprises a first electromagnetic valve.

[0015] The first electromagnetic valve is arranged on the first refrigerant branch pipeline between the plate heat exchanger and the exhaust pipe of the compressor, and is configured to open or close the first refrigerant branch pipeline according to the instruction of the controller.

[0016] Optionally, the second refrigerant branch pipeline is divided into a first branch pipeline and a second branch pipeline after passing through the plate heat exchanger.

[0017] The first branch pipeline flows into the main refrigerant pipeline between the electronic expansion valve and the outdoor heat exchanger.

[0018] The second branch pipeline flows into the main refrigerant pipeline between the electronic expansion valve and the indoor heat exchanger.

[0019] Optionally, the valve mechanism further comprises a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve.

[0020] The second electromagnetic valve is arranged on the first branch pipeline, and is configured to open or close the first branch pipeline according to the instruction of the controller.

[0021] The third electromagnetic valve is arranged on the main refrigerant pipeline between the electronic expansion valve and the indoor heat exchanger, and is configured to open or close the main refrigerant pipeline according to the instruction of the controller.

[0022] The fourth electromagnetic valve is arranged on the second branch pipeline, and is configured to open or close the second branch pipeline according to the instruction of the controller.

[0023] Optionally, the sensing mechanism comprises a first pressure sensor and a second pressure sensor.

[0024] The first pressure sensor is arranged between the outdoor heat exchanger and the electronic expansion valve, and is used for detecting the pressure at the inlet of the electronic expansion valve.

[0025] The second pressure sensor is arranged between the indoor heat exchanger and the electronic expansion valve, and is used for detecting the pressure at the outlet of the electronic expansion valve.

[0026] In a second aspect, an air conditioner heating control method is provided. The method is applied to a controller in an air conditioner. The air conditioner further includes an indoor heat exchanger, a pressure sensor, an electronic expansion valve, and an outdoor heat exchanger. The electronic expansion valve is arranged on a main refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger. The pressure sensor is arranged on the main refrigerant pipeline between the electronic expansion valve and the outdoor heat exchanger. The controller is in communication connection with the indoor heat exchanger, the pressure sensor, the electronic expansion valve, and the outdoor heat exchanger. The method includes the following steps.

[0027] After the air conditioner is started to heat according to a preset condition, the air conditioner is controlled to operate in a first operation mode for a first preset time length.

[0028] A first pressure detected by the pressure sensor is obtained, and it is determined whether the first pressure is less than or equal to a first preset pressure.

[0029] If yes, the air conditioner is controlled to operate in a second operation mode for a second preset time length and in a third operation mode for a third preset time length in sequence.

[0030] A second pressure detected by the pressure sensor is obtained, and it is determined whether the second pressure is less than or equal to a second preset pressure.

[0031] If no, the air conditioner is controlled to operate in the third operation mode for a fourth preset time length, a third pressure detected by the pressure sensor is obtained, and it is determined whether the third pressure is less than or equal to a third preset pressure.

[0032] If no, the air conditioner is controlled to operate in a fourth operation mode for a fifth preset time length, a fourth pressure detected by the pressure sensor is obtained, and the operation mode and the operation time length of the air conditioner are determined again according to the fourth pressure.

[0033] Optionally, the operation mode and the operation time length of the air conditioner are determined again according to the fourth pressure, including the following steps.

[0034] determining a preset pressure interval in which the fourth pressure is located, the preset pressure interval comprising a first preset pressure interval, a second preset pressure interval, a third preset pressure interval and a fourth preset pressure interval, wherein the pressure values of the first preset pressure interval, the second preset pressure interval, the third preset pressure interval and the fourth preset pressure interval are sequentially increased;

[0035] if the fourth pressure is in the first preset pressure interval, controlling the air conditioner to sequentially run in the second operation mode for the second preset time length, run in the third operation mode for the third preset time length, and reacquire the second pressure, and determining the operation mode of the air conditioner according to the size relationship between the second pressure and the second preset pressure;

[0036] if the fourth pressure is in the second preset pressure interval, controlling the air conditioner to run in the third operation mode for the fourth preset time length, and reacquiring the third pressure, and determining the operation mode of the air conditioner according to the size relationship between the third pressure and the third preset pressure;

[0037] if the fourth pressure is in the third preset pressure interval, controlling the air conditioner to run in the fourth operation mode for the fifth preset time length, and reacquiring the fourth pressure, and determining the operation mode of the air conditioner according to the preset pressure interval in which the fourth pressure is located;

[0038] if the fourth pressure is in the fourth preset pressure interval, controlling the air conditioner to run in the first operation mode for the first preset time length, and reacquiring the first pressure, and determining the operation mode of the air conditioner according to the size relationship between the first pressure and the first preset pressure.

[0039] Optionally, the air conditioner further comprises a compressor and a four-way valve, and a first refrigerant branch is arranged between the exhaust pipe of the compressor and the four-way valve; a second refrigerant branch is further arranged on the refrigerant main pipeline, and the second refrigerant branch is divided into a first branch and a second branch; a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve which are respectively in communication connection with the controller are respectively arranged on the first refrigerant branch, the first branch, the refrigerant main pipeline and the second branch;

[0040] the first operation mode is to close the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve, and to open the third electromagnetic valve;

[0041] the second operation mode is to open the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve, and to close the third electromagnetic valve;

[0042] The third operation mode is to close the second electromagnetic valve and the third electromagnetic valve, and to open the first electromagnetic valve and the fourth electromagnetic valve.

[0043] The fourth operation mode is to open the first electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve, and to close the second electromagnetic valve.

[0044] In a third aspect, an air conditioner is provided, which comprises the air conditioner heating control system according to any one of the preceding embodiments, and executes the air conditioner heating control method according to any one of the preceding embodiments.

[0045] In a fourth aspect, a computer readable storage medium is provided, which comprises a computer program, and when the computer program is executed, controls a server where the computer readable storage medium is located to implement the steps of the method according to any one of the preceding embodiments. The beneficial effects of the embodiments of the present application include, for example:

[0046] When the air conditioner reaches a preset condition and performs heating operation, the sensing mechanism judges whether the refrigerant oil in the refrigerant pipeline is blocked, and in the case of blockage, the valve mechanism and the heat exchange mechanism heat part of the refrigerant pipeline, thereby causing the refrigerant oil to flow back, and ensuring the heating effect of the air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0048] Figure 1 An existing air conditioner system schematic diagram provided by the embodiments of the present application;

[0049] Figure 2 An architecture diagram of an air conditioner heating control system provided by the embodiments of the present application;

[0050] Figure 3 An operation principle diagram of an air conditioner heating control system provided by the embodiments of the present application;

[0051] Figure 4 A step flowchart of an air conditioner heating control method provided by the embodiments of the present application;

[0052] Figure 5 A schematic diagram of a preset pressure interval provided by the embodiments of the present application;

[0053] Figure 6A heating control logic diagram of an air conditioner is provided in the embodiments of the present application.

[0054] Icon: 01-air conditioner; 001-compressor; 002-four-way valve; 003-indoor heat exchanger; 004-outdoor heat exchanger; 005-electronic expansion valve; 21-refrigerant main pipeline; 10-air conditioner heating control system; 11-first refrigerant branch; 12-second refrigerant branch; 121-first branch; 122-second branch; 13-heat exchange mechanism; 14-sensing mechanism; 141-first pressure sensor; 142-second pressure sensor; 15-valve mechanism; 151-first electromagnetic valve; 152-second electromagnetic valve; 153-third electromagnetic valve; 154-fourth electromagnetic valve. DETAILED DESCRIPTION

[0055] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0057] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0058] In addition, if the terms "first", "second" and the like are used, they are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0059] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0060] Please refer to Figure 1 is a system architecture diagram of a general air conditioner in the prior art. When heating runs, the refrigerant is discharged from the compressor exhaust port, reaches the indoor heat exchanger, and then flows to the outdoor heat exchanger through the electronic expansion valve. After passing through the outdoor heat exchanger, the refrigerant flows back to the gas-liquid separator through the four-way valve, completing the refrigerant heating cycle.

[0061] However, when the air conditioner is in defrosting operation, the refrigerant flows in the pipeline in the direction opposite to the heating direction, i.e. the refrigerant flows in the direction opposite to the refrigeration operation direction, and the temperature of the indoor heat exchanger continuously decreases, so that the oil film may be generated on the pipeline of the indoor heat exchanger. When the outdoor unit restarts the heating operation, the refrigerant first flows through the indoor side, and at this time, the temperature of the indoor heat exchanger is too low, and the temperature difference between the indoor heat exchanger and the refrigerant is large, so that the heat exchange amount is large.

[0062] After the refrigerant flows out of the indoor heat exchanger, the temperature of the refrigerant is much lower than that in the normal operation, so that part of the lubricating oil may be separated from the refrigerant. At this time, after the refrigerant passes through the electronic expansion valve of the outdoor unit, the low pressure is further reduced, and the low pressure saturation temperature is even reduced to below the minimum temperature at which the lubricating oil can flow, so that the electronic expansion valve is blocked, and the heating effect of the air conditioner is deteriorated.

[0063] Based on the above, the application provides an air conditioner heating control system and method and an air conditioner, which can effectively alleviate the above technical problems.

[0064] Please refer to Figure 2 The air conditioner heating control system provided by the embodiment of the application is applied to an air conditioner 01, the air conditioner 01 includes a compressor 001, a four-way valve 002, an indoor heat exchanger 003, and an outdoor heat exchanger 004, a first refrigerant branch 11 is led out from the outlet of the exhaust pipe of the compressor 001, the first refrigerant branch 11 is converged at the gas-liquid separator of the compressor 001, an electronic expansion valve 005 is arranged on a refrigerant main pipeline 21 between the indoor heat exchanger 003 and the outdoor heat exchanger 004, a second refrigerant branch 12 is led out from the refrigerant main pipeline 21, and the second refrigerant branch 12 is diverged / converged at the inlet / outlet of the electronic expansion valve 005, respectively. The air conditioner heating control system 10 includes a heat exchange mechanism 13, a sensing mechanism 14, a valve mechanism 15, and a control mechanism, the control mechanism includes a controller, and the controller is in communication connection with the heat exchange mechanism 13, the sensing mechanism 14, and the valve mechanism 15, respectively.

[0065] The heat exchange mechanism 13 is connected to the first refrigerant branch 11 and the second refrigerant branch 12, respectively, and is used for heating the refrigerant flowing through the second refrigerant branch 12 by the refrigerant in the first refrigerant branch 11.

[0066] The sensing mechanism 14 is arranged on the refrigerant main pipeline 21 where the electronic expansion valve 005 is located, and is used for detecting the pressure in the refrigerant main pipeline 21 at the inlet and outlet of the electronic expansion valve 005.

[0067] The valve mechanism 15 is arranged on the refrigerant main pipeline 21, the first refrigerant branch 11, and the second refrigerant branch 12, and is used for controlling the on-off state of the first refrigerant branch 11 and the second refrigerant branch 12.

[0068] The controller is used to acquire the pressure data detected by the sensing mechanism 14, and control the running state of the heat exchange mechanism 13 and the valve mechanism 15 according to the pressure data, so as to control the on-off state of the refrigerant main pipeline 21, the first refrigerant branch pipeline 11 and the second refrigerant branch pipeline 12, and realize the heating of the electronic expansion valve by the refrigerant.

[0069] The controller can be a data processing device built-in or external to the air conditioner heating control system 10; the heat exchange mechanism 13 can be a plate heat exchanger or other electric heater; the sensing mechanism 14 can be a pressure sensor for detecting the pipe pressure; and the valve mechanism 15 can be one or more electromagnetic valves for controlling the on-off state of the refrigerant pipeline.

[0070] As shown in Figure 2 , the air conditioner heating control system 10 is applied to the air conditioner 01, that is, the air conditioner heating control system 10 is also part of the air conditioner 01. In Figure 2 , in addition to the structure contained in the general air conditioner, the first refrigerant branch pipeline 11 is additionally led out from the exhaust port of the compressor 001 and flows back to the gas-liquid separator through the heat exchange mechanism 13; and the second refrigerant branch pipeline 12 is additionally led out between the indoor heat exchanger 003 and the outdoor heat exchanger 004 and also flows through the heat exchange mechanism 13. The valve mechanism 15 is arranged on the first refrigerant branch pipeline 11 and the second refrigerant branch pipeline 12 to control the on-off state of the first refrigerant branch pipeline 11 and the second refrigerant branch pipeline 12, and the sensing mechanism 14 is arranged on both sides of the electronic expansion valve 005 to detect the refrigerant pressure between the indoor heat exchanger 003 and the outdoor heat exchanger 004.

[0071] When the air conditioner is in heating operation, the controller of the control mechanism can judge whether the refrigeration oil is precipitated and blocks the refrigerant pipeline according to the pressure parameter detected by the sensing mechanism 14 after acquiring the pressure parameter, and then control the opening and closing of the valve mechanism 15, so as to control the on-off state of the first refrigerant branch pipeline 11 and the second refrigerant branch pipeline 12.

[0072] Therefore, when the air conditioner 01 enters the defrosting and restarts the heating operation, the air conditioner heating control system 10 can heat the refrigerant flowing out of the indoor unit through the heat exchange mechanism 13, so that the temperature of the refrigerant flowing to the electronic expansion valve 005 is not too low, and the low-pressure saturated temperature of the refrigerant flowing out of the electronic expansion valve 005 is relatively large, thereby preventing the problem of precipitation of refrigeration oil blocking the electronic expansion valve 005.

[0073] And, when the air conditioner 01 has the problem of the electronic expansion valve 005 blockage, the air conditioner heating control system 10 can first make part of the refrigerant not throttled directly flow through the outside heat exchanger by controlling the on-off of the first refrigerant branch 11 and the second refrigerant branch 12, and the other part of the refrigerant heats the electronic expansion valve 005, and when the electronic expansion valve 005 is no longer blocked, continue to control according to the starting mode until the air conditioner 01 completes the starting stage control and enters the normal control.

[0074] Optionally, as shown in Figure 3 The sensing mechanism 14 includes a first pressure sensor 141 and a second pressure sensor 142.

[0075] The first pressure sensor 141 is arranged between the outdoor heat exchanger 004 and the electronic expansion valve 005, and is used to detect the pressure at the inlet of the electronic expansion valve 005.

[0076] The second pressure sensor 142 is arranged between the indoor heat exchanger 003 and the electronic expansion valve 005, and is used to detect the pressure at the outlet of the electronic expansion valve 005.

[0077] The first pressure sensor 141 is arranged between the outdoor heat exchanger 004 and the electronic expansion valve 005, and is used to detect the pressure at the inlet of the electronic expansion valve 005.

[0078] The second pressure sensor 142 is arranged between the indoor heat exchanger 003 and the electronic expansion valve 005, and is used to detect the pressure at the outlet of the electronic expansion valve 005.

[0079] The first pressure sensor 141 and the second pressure sensor 142 are respectively arranged on the refrigerant main pipeline 21 and located at the inlet and outlet of the electronic expansion valve 005, so that the first pressure sensor 141 and the second pressure sensor 142 can respectively obtain the pressure in the refrigerant main pipeline 21 before flowing into the electronic expansion valve 005 and the pressure in the refrigerant main pipeline 21 after flowing out of the electronic expansion valve 005.

[0080] When the electronic expansion valve 005 is blocked, the low pressure after throttling will rapidly decrease and even be lower than the atmospheric pressure, and the pressure before throttling still remains relatively high. Therefore, when a large pressure difference / low pressure is detected, it can be determined that the refrigeration oil precipitation has blocked the electronic expansion valve 005.

[0081] Optionally, the heat exchange mechanism 13 includes a plate heat exchanger, and the plate heat exchanger includes a first refrigerant inlet, a second refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet. The first refrigerant inlet and the first refrigerant outlet are respectively connected with the first refrigerant branch 11. The second refrigerant inlet and the second refrigerant outlet are respectively connected with the second refrigerant branch 12.

[0082] Still with Figure 3For example, the first refrigerant inlet and the first refrigerant outlet can be the connection ports of the plate heat exchanger through which the first refrigerant branch 11 passes; and the second refrigerant inlet and the second refrigerant outlet can be the connection ports of the plate heat exchanger through which the second refrigerant branch 12 passes.

[0083] Optionally, the valve mechanism 15 comprises a first electromagnetic valve 151. The first electromagnetic valve 151 is arranged on the first refrigerant branch 11 between the plate heat exchanger and the discharge pipe of the compressor 001, and is used to open or close the first refrigerant branch 11 according to the instruction of the controller.

[0084] As shown in Figure 3 , the first electromagnetic valve 151 is arranged on the first refrigerant branch 11. When the air conditioner 01 normally operates in heating mode, the first electromagnetic valve 151 can be closed. When there is refrigeration oil blockage, the first electromagnetic valve 151 can be opened to make the refrigerant flow in the first refrigerant branch 11 and pass through the plate heat exchanger to be heated, so that part of the refrigerant is heated.

[0085] Optionally, as shown in Figure 3 , the second refrigerant branch 12 is divided into a first branch 121 and a second branch 122 after passing through the plate heat exchanger. The first branch 121 flows into the refrigerant main pipe 21 between the electronic expansion valve 005 and the outdoor heat exchanger 004. The second branch 122 flows into the refrigerant main pipe 21 between the electronic expansion valve 005 and the indoor heat exchanger 003.

[0086] Optionally, the valve mechanism 15 further comprises a second electromagnetic valve 152, a third electromagnetic valve 153, and a fourth electromagnetic valve 154. The second electromagnetic valve 152 is arranged on the first branch 121 and is used to open or close the first branch 121 according to the instruction of the controller. The third electromagnetic valve 153 is arranged on the refrigerant main pipe 21 between the electronic expansion valve 005 and the indoor heat exchanger 003, and is used to open or close the refrigerant main pipe 21 according to the instruction of the controller. The fourth electromagnetic valve 154 is arranged on the second branch 122 and is used to open or close the second branch 122 according to the instruction of the controller.

[0087] The arrangement of the first branch 121 can make the refrigerant in the refrigerant main pipe 21 between the indoor heat exchanger 003 and the outdoor heat exchanger 004 not pass through the electronic expansion valve 005, but pass through the plate heat exchanger to be heated and then continue to flow in the refrigerant main pipe 21. The arrangement of the second branch 122 can make the refrigerant in the refrigerant main pipe 21 between the indoor heat exchanger 003 and the outdoor heat exchanger 004 pass through the plate heat exchanger to be heated and then flow through the electronic expansion valve 005. The arrangement of the second electromagnetic valve 152 on the first branch 121 can heat part of the refrigerant when the refrigeration oil has not blocked the electronic expansion valve 005, but there is a possibility of blockage.

[0088] As shown in Figure 3As shown, the third electromagnetic valve 153 can be arranged on the refrigerant main pipeline 21 to control the opening and closing of the refrigerant main pipeline 21. The fourth electromagnetic valve 154 can be arranged on the second branch pipeline 122 after the refrigerant passes through the plate heat exchanger to control the opening and closing of the second branch pipeline 122.

[0089] In order to better illustrate the control mode of the air conditioning heating control system 10, the embodiment of the present application provides an air conditioning heating control method corresponding to the air conditioning heating control system 10, which is applied to a controller in the air conditioner 01, and the air conditioner 01 further includes an indoor heat exchanger 003, a pressure sensor, an electronic expansion valve 005, and an outdoor heat exchanger 004. The electronic expansion valve 005 is arranged on the refrigerant main pipeline 21 between the indoor heat exchanger 003 and the outdoor heat exchanger 004. The pressure sensor is arranged on the refrigerant main pipeline 21 between the electronic expansion valve 005 and the outdoor heat exchanger 004. The controller is in communication connection with the indoor heat exchanger 003, the pressure sensor, the electronic expansion valve 005, and the outdoor heat exchanger 004 respectively. The method includes the following steps as shown: Figure 4

[0090] Step S110: When the air conditioner 01 meets the preset condition for starting heating, the air conditioner 01 is controlled to operate in the first operation mode for a first preset time length.

[0091] Step S120: The first pressure detected by the pressure sensor is obtained, and it is judged whether the first pressure is less than or equal to a first preset pressure.

[0092] Step S130: If yes, the air conditioner 01 is controlled to operate in the second operation mode for a second preset time length and in the third operation mode for a third preset time length in turn.

[0093] Step S140: The second pressure detected by the pressure sensor is obtained, and it is judged whether the second pressure is less than or equal to a second preset pressure.

[0094] Step S150: If no, the air conditioner 01 is controlled to operate in the third operation mode for a fourth preset time length, and the third pressure detected by the pressure sensor is obtained, and it is judged whether the third pressure is less than or equal to a third preset pressure.

[0095] Step S160: If no, the air conditioner 01 is controlled to operate in the fourth operation mode for a fifth preset time length, and the fourth pressure detected by the pressure sensor is obtained, and the operation mode and the operation time length of the air conditioner 01 are re-determined according to the fourth pressure.

[0096] The preset condition can be a specific condition for limiting the starting of the air conditioner 01, for example, when the air conditioner 01 starts heating after defrosting, it is considered to meet the preset condition; or when the air conditioner 01 starts heating after defrosting and the electronic expansion valve reaches a certain opening degree, it is considered to meet the preset condition.

[0097] ​The first operation mode, the second operation mode, the third operation mode, and the fourth operation mode can be operation modes in which the air conditioner 01 additionally heats refrigerant at different positions in the refrigerant pipeline when the air conditioner 01 is in a heating operation. For example, the first operation mode can be a normal heating operation, and the air conditioner 01 does not additionally process the refrigerant in the refrigerant pipeline. The second operation mode can be an operation mode in which the air conditioner 01 additionally heats the refrigerant in the refrigerant pipeline between the electronic expansion valve and the indoor heat exchanger in the case of the normal heating operation. The third operation mode can be an operation mode in which the air conditioner 01 additionally heats the refrigerant in the refrigerant pipeline between the electronic expansion valve and the outdoor heat exchanger in the case of the normal heating operation. The fourth operation mode can be an operation mode in which the air conditioner 01 additionally heats part of the refrigerant in the compressor in the case of the normal heating operation, and the like.

[0098] When the air conditioner 01 switches modes, in order to make the data detected by the pressure sensor more accurate, the detection can be performed after the air conditioner 01 is stably operated. The developer can set the same or different operation durations after each operation mode, that is, the first preset duration, the second preset duration, the third preset duration, the fourth preset duration, and the fifth preset duration, according to actual conditions. The preset durations can be the same, partially the same, or all different, which is not limited in the embodiments of the present application.

[0099] When the air conditioner 01 is started, the controller first adjusts the parameters of the air conditioner 01 to meet the preset conditions. After the preset conditions are met, the air conditioner 01 is controlled to operate in the normal heating mode for a certain duration, that is, the first preset duration.

[0100] For example, if the first preset duration is 20 s, and the air conditioner 01 is defrosted and started, the electronic expansion valve opening degree is 500 pls when the preset conditions are met, the air conditioner 01 is controlled to defrost and then adjust the electronic expansion valve opening degree to 500 pls, and then the air conditioner 01 is controlled to operate in the first operation mode for 20 s.

[0101] After the air conditioner 01 operates in the first operation mode for the first preset duration, the controller obtains the pressure data of the refrigerant pipeline, that is, the first pressure, through the pressure sensor. If the first pressure is less than or equal to the pressure threshold value preset by the developer, that is, the first preset pressure, the air conditioner 01 is controlled to switch to the second operation mode and operate for the second preset duration, and then switch to the third operation mode and operate for the third preset duration. If the first pressure is greater than the first preset pressure, the air conditioner 01 is controlled to re-operate in the first operation mode for the first preset duration, and then obtain the first pressure for judgment.

[0102] When the air conditioner 01 runs in the third operation mode for a third preset time length, the pressure data of the primary refrigerant pipeline, i.e., the second pressure, is obtained through the pressure sensor. If the second pressure is greater than the pressure threshold value preset by the developer, i.e., the second preset pressure, the air conditioner 01 is controlled to continue running in the third operation mode for a fourth preset time length. If the second pressure is less than or equal to the second preset pressure, the air conditioner 01 is controlled to run in the second operation mode for a second preset time length, and then run in the third operation mode for a third preset time length before the second pressure is obtained again for re-determination.

[0103] When the air conditioner 01 runs in the third operation mode for a fourth preset time length, the pressure data of the primary refrigerant pipeline, i.e., the third pressure, is obtained through the pressure sensor. If the third pressure is greater than the pressure threshold value preset by the developer, i.e., the third preset pressure, the air conditioner 01 is controlled to switch to the fourth operation mode and run for a fifth preset time length. Then, the pressure data of the pressure sensor, i.e., the fourth pressure, is obtained again, and the operation mode and the running time length of the air conditioner 01 are determined again according to the fourth pressure.

[0104] As an optional implementation, if the third pressure is less than or equal to the pressure threshold value preset by the developer, i.e., the third preset pressure, a pressure threshold value smaller than the third preset pressure can be further set to more accurately control the operation mode of the air conditioner 01. If the third pressure is less than or equal to the third preset pressure, it can be further determined whether the third pressure is less than or equal to the pressure threshold value smaller than the third preset pressure. If yes, the air conditioner 01 is controlled to run in the second operation mode for a second preset time length, and then run in the third operation mode for a third preset time length before the second pressure is obtained again for re-determination. If no, the air conditioner 01 is controlled to run in the third operation mode for a fourth preset time length before the third pressure is obtained again for re-determination.

[0105] Optionally, the air conditioner 01 further comprises a compressor 001 and a four-way valve 002. The first refrigerant branch 11 is arranged between the exhaust pipe of the compressor 001 and the four-way valve 002. The second refrigerant branch 12 is further arranged on the main refrigerant pipeline 21. The second refrigerant branch 12 is divided into a first branch 121 and a second branch 122. The first electromagnetic valve 151, the second electromagnetic valve 152, the third electromagnetic valve 153, and the fourth electromagnetic valve 154 are respectively arranged on the first refrigerant branch 11, the first branch 121, the main refrigerant pipeline 21, and the second branch 122, and are respectively in communication connection with the controller.

[0106] The first operation mode is to close the first electromagnetic valve 151, the second electromagnetic valve 152, and the fourth electromagnetic valve 154, and open the third electromagnetic valve 153.

[0107] The second operation mode is to open the first electromagnetic valve 151, the second electromagnetic valve 152, and the fourth electromagnetic valve 154, and close the third electromagnetic valve 153.

[0108] The third operating mode is to close the second solenoid valve 152 and the third solenoid valve 153, and open the first solenoid valve 151 and the fourth solenoid valve 154.

[0109] The fourth operating mode is to open the first solenoid valve 151, the third solenoid valve 153 and the fourth solenoid valve 154, and close the second solenoid valve 152.

[0110] like Figure 3 As shown, in one optional implementation, the first operating mode can be controlling the air conditioner 01 to operate in a refrigerant passage such as closing the first solenoid valve 151, the second solenoid valve 152, and the fourth solenoid valve 154, and opening the third solenoid valve 153; the second operating mode can be controlling the air conditioner 01 to operate in a refrigerant passage such as opening the first solenoid valve 151, the second solenoid valve 152, and the fourth solenoid valve 154, and closing the third solenoid valve 153; the third operating mode can be controlling the air conditioner 01 to operate in a refrigerant passage such as closing the second solenoid valve 152 and the third solenoid valve 153, and opening the first solenoid valve 151 and the fourth solenoid valve 154; and the fourth operating mode can be controlling the air conditioner 01 to operate in a refrigerant passage such as opening the first solenoid valve 151, the third solenoid valve 153, and the fourth solenoid valve 154, and closing the second solenoid valve 152.

[0111] Optionally, the operating mode and operating duration of air conditioner 01 are re-determined based on the fourth pressure, including:

[0112] Determine the preset pressure range in which the fourth pressure is located. The preset pressure range includes the first preset pressure range, the second preset pressure range, the third preset pressure range, and the fourth preset pressure range, wherein the pressure values ​​of the first preset pressure range, the second preset pressure range, the third preset pressure range, and the fourth preset pressure range increase sequentially.

[0113] If the fourth pressure is within the first preset pressure range, the air conditioner 01 is controlled to run in the second operating mode for the second preset duration and in the third operating mode for the third preset duration in sequence, and the second pressure is reacquired. The operating mode of the air conditioner 01 is determined according to the relationship between the second pressure and the second preset pressure.

[0114] If the fourth pressure is within the second preset pressure range, the air conditioner 01 is controlled to run in the third operating mode for the fourth preset duration, and the third pressure is reacquired. The operating mode of the air conditioner 01 is determined according to the relationship between the third pressure and the third preset pressure.

[0115] If the fourth pressure is within the third preset pressure range, the air conditioner 01 will operate in the fourth operating mode for the fifth preset duration, and the fourth pressure will be reacquired. The operating mode of the air conditioner 01 will be re-determined based on the preset pressure range in which the fourth pressure is located.

[0116] If the fourth pressure is in the fourth preset pressure interval, the air conditioner 01 is controlled to run in the first operation mode for a first preset time length, and the first pressure is re-acquired, and the operation mode of the air conditioner 01 is determined according to the size relationship between the first pressure and the first preset pressure.

[0117] When the air conditioner runs in the fourth operation mode for a fifth preset time length, the controller acquires the pressure data of the refrigerant pipeline, i.e., the fourth pressure, through the pressure sensor. The pressure range in which the fourth pressure is located, i.e., the preset pressure interval, is determined.

[0118] As shown in Figure 5 The preset pressure interval includes a first preset pressure interval, a second preset pressure interval, a third preset pressure interval, and a fourth preset pressure interval. In the embodiment, the pressure value of the first preset pressure interval < the pressure value of the second preset pressure interval < the pressure value of the third preset pressure interval < the pressure value of the fourth preset pressure interval.

[0119] If the fourth pressure is in the first preset pressure interval, the air conditioner 01 is controlled to run in the second operation mode for a second preset time length, and then run in the third operation mode for a third preset time length. The second pressure is re-acquired, and the operation mode of the air conditioner 01 is re-determined according to the size relationship between the second pressure and the second preset pressure. If the fourth pressure is in the second preset pressure interval, the air conditioner 01 is controlled to run in the third operation mode for a fourth preset time length, and then the third pressure is re-acquired, and the operation mode of the air conditioner 01 is determined according to the size relationship between the third pressure and the third preset pressure. If the fourth pressure is in the third preset pressure interval, the air conditioner 01 is controlled to run in the fourth operation mode for a fifth preset time length. Then the fourth pressure is re-acquired, and the operation mode of the air conditioner 01 is re-determined according to the preset pressure interval in which the fourth pressure is located. If the fourth pressure is in the fourth preset pressure interval, the air conditioner 01 is controlled to run in the first operation mode for a first preset time length. Then the first pressure is re-acquired, and the operation mode of the air conditioner 01 is determined according to the size relationship between the first pressure and the first preset pressure.

[0120] As shown in Figure 6As shown, a control logic diagram of an air conditioning heating control method provided in the specification. The preset condition is that the air conditioner defrosting is started, and the electronic expansion valve opening degree is 300 pls. The first preset pressure is 0.02 Mpa, the second preset pressure is 0.05 Mpa, and the third preset pressure is 0.1 Mpa. The first preset pressure interval is 0-0.05 Mpa, the second preset pressure interval is 0.05-0.1 Mpa, the third preset pressure interval is 0.1-0.15 Mpa, and the fourth preset pressure interval is greater than 0.15 Mpa. The first preset time t1 is 20 s, the second preset time t2 is 30 s, the third preset time t3 is 10 s, the fourth preset time t4 is 30 s, and the fifth preset time t5 is 30 s. Ps1 is the first pressure, Ps2 is the second pressure, Ps3 is the third pressure, and Ps4 is the fourth pressure.

[0121] After the air conditioner is started, it is first determined whether the preset condition is met. If so, the air conditioner is controlled to run in the first running mode for t1.

[0122] It is determined whether Ps1 is less than or equal to 0.02 Mpa. If so, the air conditioner is controlled to run in the second running mode for t2, and then in the third running mode for t3; if not, the air conditioner is controlled to run in the first running mode for t1, and then re-determined.

[0123] After the air conditioner runs in the second running mode for t2 and then in the third running mode for t3, it is determined whether Ps2 is less than or equal to 0.05 Mpa. If so, the air conditioner is controlled to run in the second running mode for t2, and then in the third running mode for t3, and then re-determined; if not, the air conditioner is controlled to run in the third running mode for t4.

[0124] After the air conditioner runs in the third running mode for t4, it is determined whether Ps3 is less than or equal to 0.1 Mpa. If so, it is further determined whether Ps3 is less than or equal to 0.05 Mpa. If so, the air conditioner is controlled to run in the second running mode for t2, and then in the third running mode for t3; if not, the air conditioner is controlled to run in the third running mode for t4, and then re-determined.

[0125] If Ps3 is greater than 0.1 Mpa, the air conditioner is controlled to run in the fourth running mode for t5, and then it is determined whether Ps4 is in the preset pressure interval.

[0126] If Ps4 is in the first preset pressure interval, the air conditioner is controlled to switch to the second operation mode to run for t2, and then to the third operation mode to run for t3. Ps2 is re-acquired, and the operation mode of the air conditioner is re-determined according to the size relationship between Ps2 and the second preset pressure. If Ps4 is in the second preset pressure interval, the air conditioner is controlled to switch to the third operation mode to run for t4, and then Ps3 is re-acquired, and the operation mode of the air conditioner is determined according to the size relationship between Ps3 and the third preset pressure. If Ps4 is in the third preset pressure interval, the air conditioner is controlled to switch to the fourth operation mode to run for t5. Then Ps4 is re-acquired, and the operation mode of the air conditioner is re-determined according to the preset pressure interval in which Ps4 is located. If Ps4 is in the fourth preset pressure interval, the air conditioner is controlled to switch to the first operation mode to run for t1. Then Ps1 is re-acquired, and the operation mode of the air conditioner is determined according to the size relationship between Ps1 and the first preset pressure.

[0127] Based on the same inventive concept, the embodiments of the specification of the present application provide an air conditioner 01 comprising the air conditioner heating control system 10 of any one of the above, and the air conditioner 01 executes the air conditioner heating control method of any one of the above when running.

[0128] Regarding the above air conditioner 01, the specific functions of each unit have been described in detail in the embodiments of the air conditioner heating control system and the air conditioner heating control method provided in the specification, and will not be described in detail here.

[0129] The present application at least includes the following beneficial effects:

[0130] When the air conditioner reaches the preset condition and performs the heating operation, the sensing mechanism judges whether the refrigerant oil in the refrigerant pipeline is blocked, and in the case of blockage, the valve mechanism and the heat exchange mechanism heat part of the refrigerant pipeline, thereby making the refrigerant oil return, and ensuring the heating effect of the air conditioner.

[0131] In several embodiments provided by the present application, it should be understood that the disclosed apparatus and method can also be implemented by other manners. The apparatus embodiments described above are merely illustrative, for example, the flowcharts and block diagrams in the drawings show the possible implementation architecture, function and operation of the apparatus, method and computer program product according to the embodiments of the present application. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in different order from that shown in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can also be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system for executing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0132] In addition, the functional modules in the embodiments of the present application can be integrated together to form a separate part, or each module can exist independently, or two or more modules can be integrated to form a separate part.

[0133] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the technical solutions or the part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for causing a computer device, such as a personal computer, a server, or a network device, to execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk, and various media that can store program codes.

[0134] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning heating control system, characterized by, The application is applied to an air conditioner (01), the air conditioner (01) comprises a compressor (001), a four-way valve (002), an indoor heat exchanger (003) and an outdoor heat exchanger (004), a first refrigerant branch (11) is led out from the outlet of the exhaust pipe of the compressor (001), the first refrigerant branch (11) converges at the gas-liquid separator of the compressor (001), an electronic expansion valve (005) is arranged on the refrigerant main pipeline (21) between the indoor heat exchanger (003) and the outdoor heat exchanger (004), a second refrigerant branch (12) is led out from the refrigerant main pipeline (21), the second refrigerant branch (12) diverges at the inlet of the electronic expansion valve (005) and converges at the outlet of the electronic expansion valve (005) respectively; the air conditioner heating control system (10) comprises a heat exchange mechanism (13), a sensing mechanism (14), a valve mechanism (15) and a control mechanism, the control mechanism comprises a controller, and the controller is in communication connection with the heat exchange mechanism (13), the sensing mechanism (14) and the valve mechanism (15) respectively; the heat exchange mechanism (13) is connected to the first refrigerant branch (11) and the second refrigerant branch (12) respectively, and is used for heating the refrigerant flowing through the second refrigerant branch (12) by the refrigerant in the first refrigerant branch (11); the sensing mechanism (14) is arranged on the refrigerant main pipeline (21) where the electronic expansion valve (005) is located, and is used for detecting the pressure in the refrigerant main pipeline (21) at the inlet and outlet of the electronic expansion valve (005); the valve mechanism (15) is arranged on the refrigerant main pipeline (21), the first refrigerant branch (11) and the second refrigerant branch (12), and is used for controlling the on-off state of the first refrigerant branch (11) and the second refrigerant branch (12); the controller is used for acquiring the pressure data detected by the sensing mechanism (14), and controlling the running state of the heat exchange mechanism (13) and the valve mechanism (15) according to the pressure data, so as to control the on-off state of the refrigerant main pipeline (21), the first refrigerant branch (11) and the second refrigerant branch (12), and realize the heating of the electronic expansion valve by the refrigerant.

2. The air conditioning and heating control system of claim 1, wherein, the heat exchange mechanism (13) comprises a plate heat exchanger, the plate heat exchanger comprises a first refrigerant inlet, a second refrigerant inlet, a first refrigerant outlet and a second refrigerant outlet; the first refrigerant inlet and the first refrigerant outlet are connected with the first refrigerant branch (11) respectively; the second refrigerant inlet and the second refrigerant outlet are connected with the second refrigerant branch (12) respectively.

3. The air conditioning and heating control system of claim 2, wherein, the valve mechanism (15) comprises a first electromagnetic valve (151); the first electromagnetic valve (151) is arranged on the first refrigerant branch (11) and located between the plate heat exchanger and the exhaust pipe of the compressor (001), and is used for opening or closing the first refrigerant branch (11) according to the instruction of the controller.

4. The air conditioning and heating control system of claim 2, wherein, The second refrigerant branch (12) is divided into a first branch (121) and a second branch (122) after passing through the plate heat exchanger; The first branch (121) merges into the refrigerant main pipeline (21) between the electronic expansion valve (005) and the outdoor heat exchanger (004); The second branch (122) merges into the refrigerant main pipeline (21) between the electronic expansion valve (005) and the indoor heat exchanger (003).

5. The air conditioning and heating control system of claim 4, wherein, The valve mechanism (15) further comprises a second electromagnetic valve (152), a third electromagnetic valve (153) and a fourth electromagnetic valve (154); The second electromagnetic valve (152) is arranged on the first branch (121) and is used to open or close the first branch (121) according to the instruction of the controller; The third electromagnetic valve (153) is arranged on the refrigerant main pipeline (21) between the electronic expansion valve (005) and the indoor heat exchanger (003) and is used to open or close the refrigerant main pipeline (21) according to the instruction of the controller; The fourth electromagnetic valve (154) is arranged on the second branch (122) and is used to open or close the second branch (122) according to the instruction of the controller.

6. The air conditioning and heating control system of claim 1, wherein, The sensing mechanism (14) comprises a first pressure sensor (141) and a second pressure sensor (142); The first pressure sensor (141) is arranged between the outdoor heat exchanger (004) and the electronic expansion valve (005) and is used to detect the pressure at the inlet of the electronic expansion valve (005); The second pressure sensor (142) is arranged between the indoor heat exchanger (003) and the electronic expansion valve (005) and is used to detect the pressure at the outlet of the electronic expansion valve (005).

7. An air conditioning heating control method characterized by, The application is applied to a controller of an air conditioner (01), the air conditioner (01) further comprising a compressor (001), a four-way valve (002), an indoor heat exchanger (003), a pressure sensor, an electronic expansion valve (005) and an outdoor heat exchanger (004); the electronic expansion valve (005) is arranged on a refrigerant main pipeline (21) between the indoor heat exchanger (003) and the outdoor heat exchanger (004); a first refrigerant branch (11) is led out from an exhaust pipe outlet of the compressor (001), the first refrigerant branch (11) converges at a gas-liquid separator of the compressor (001), a second refrigerant branch (12) is led out from the refrigerant main pipeline (21), the second refrigerant branch (12) diverges at an inlet of the electronic expansion valve (005) and converges at an outlet of the electronic expansion valve (005); the second refrigerant branch (12) is divided into a first branch (121) and a second branch (122) after passing through a heat exchange mechanism (13); the first branch (121) converges into the refrigerant main pipeline (21) between the electronic expansion valve (005) and the outdoor heat exchanger (004); the second branch (122) converges into the refrigerant main pipeline (21) between the electronic expansion valve (005) and the indoor heat exchanger (003); first, second, third and fourth electromagnetic valves (151, 152, 153 and 154) corresponding to the first, second, first and second refrigerant branches (11, 121, 21 and 122) are respectively arranged and are respectively in communication connection with the controller, the third electromagnetic valve (153) is arranged on the refrigerant main pipeline (21) between the electronic expansion valve (005) and the indoor heat exchanger (003); the pressure sensor is arranged on the refrigerant main pipeline (21) between the electronic expansion valve (005) and the outdoor heat exchanger (004); the controller is in communication connection with the indoor heat exchanger (003), the pressure sensor, the electronic expansion valve (005) and the outdoor heat exchanger (004); the method comprises: When the air conditioner (01) meets a preset condition for heating starting, the air conditioner (01) is controlled to operate in a first operation mode for a first preset time length, the first operation mode is to close the first electromagnetic valve (151), the second electromagnetic valve (152) and the fourth electromagnetic valve (154) and open the third electromagnetic valve (153); A first pressure detected by the pressure sensor is acquired, and it is judged whether the first pressure is less than or equal to a first preset pressure; If yes, the air conditioner (01) is controlled to operate in a second operation mode for a second preset time length and operate in a third operation mode for a third preset time length in sequence, the second operation mode is to open the first electromagnetic valve (151), the second electromagnetic valve (152) and the fourth electromagnetic valve (154) and close the third electromagnetic valve (153); acquiring a second pressure detected by the pressure sensor, and determining whether the second pressure is less than or equal to a second preset pressure; if not, controlling the air conditioner (01) to operate in a third operation mode for a fourth preset time length, acquiring a third pressure detected by the pressure sensor, and determining whether the third pressure is less than or equal to a third preset pressure, the third operation mode being that the second electromagnetic valve (152) and the third electromagnetic valve (153) are closed, and the first electromagnetic valve (151) and the fourth electromagnetic valve (154) are opened; if not, controlling the air conditioner (01) to operate in a fourth operation mode for a fifth preset time length, acquiring a fourth pressure detected by the pressure sensor, and re-determining the operation mode and operation time length of the air conditioner (01) according to the fourth pressure, the fourth operation mode being that the first electromagnetic valve (151), the third electromagnetic valve (153) and the fourth electromagnetic valve (154) are opened, and the second electromagnetic valve (152) is closed.

8. The air-conditioning heating control method according to claim 7, wherein The re-determining the operation mode and operation time length of the air conditioner (01) according to the fourth pressure comprises: determining a preset pressure interval in which the fourth pressure is located, the preset pressure interval comprising a first preset pressure interval, a second preset pressure interval, a third preset pressure interval and a fourth preset pressure interval, wherein the pressure values of the first preset pressure interval, the second preset pressure interval, the third preset pressure interval and the fourth preset pressure interval are sequentially increased; if the fourth pressure is located in the first preset pressure interval, controlling the air conditioner (01) to operate in the second operation mode for the second preset time length, in the third operation mode for the third preset time length, and re-acquiring the second pressure, and determining the operation mode of the air conditioner (01) according to the size relationship between the second pressure and the second preset pressure; if the fourth pressure is located in the second preset pressure interval, controlling the air conditioner (01) to operate in the third operation mode for the fourth preset time length, and re-acquiring the third pressure, and determining the operation mode of the air conditioner (01) according to the size relationship between the third pressure and the third preset pressure; if the fourth pressure is located in the third preset pressure interval, controlling the air conditioner (01) to operate in the fourth operation mode for the fifth preset time length, and re-acquiring the fourth pressure, and re-determining the operation mode of the air conditioner (01) according to the preset pressure interval in which the fourth pressure is located; if the fourth pressure is located in the fourth preset pressure interval, controlling the air conditioner (01) to operate in the first operation mode for the first preset time length, re-acquiring the first pressure, and determining the operation mode of the air conditioner (01) according to the size relationship between the first pressure and the first preset pressure.

9. An air conditioner characterized by comprising: The air conditioner (01) comprises the air conditioner heating control system (10) according to any one of claims 1-6, and executes the air conditioner heating control method according to any one of claims 7-8 when operating.

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