An air conditioning heating control method, system and readable storage medium

Abstract

The application discloses an air conditioner heating control method, system and readable storage medium. The method comprises the following steps: collecting a compressor discharge pressure and a compressor suction pressure; when the ratio of the compressor discharge pressure to the compressor suction pressure is lower than a preset threshold value, and the compressor suction pressure is less than or equal to a pressure threshold value, a third electronic expansion valve is opened, gas refrigerant is supplemented from a flash evaporator to a compressor compression cavity, and the refrigerant circulation amount is increased.

Description

Technical Field

[0001] This application relates to the field of computer technology, and in particular to an air conditioning heating control method, system, and readable storage medium. Background Technology

[0002] With the progress of social development, the demand for low-carbon and environmentally friendly solutions is becoming increasingly widespread. Traditional coal-fired heating methods emit large amounts of carbon dioxide and dust, which is detrimental to air quality. Using heat pump air conditioners for heating, on the other hand, utilizes clean electricity, effectively solving environmental pollution problems.

[0003] Currently, the heating temperature range of ordinary heat pump air conditioners is limited. At lower ambient temperatures (such as -20℃), the heat exchange effect of the outdoor heat exchanger is worse, resulting in a significant reduction in the heating capacity of the air conditioner and a poorer heating effect. Summary of the Invention

[0004] In view of the above problems, this application provides an air conditioning heating control method, system and readable storage medium that can effectively heat at low ambient temperatures.

[0005] This application discloses the following technical solution:

[0006] The first aspect of this application provides an air conditioning heating control method, including:

[0007] Collect the compressor discharge pressure and compressor suction pressure;

[0008] When the ratio of compressor discharge pressure to compressor suction pressure is lower than the preset value, and the compressor suction pressure is less than or equal to the pressure threshold, the third electronic expansion valve is opened to replenish gaseous refrigerant from the flash evaporator to the compressor compression chamber, thereby increasing the refrigerant circulation volume.

[0009] In one possible implementation, the method further includes:

[0010] When the outdoor ambient temperature is lower than the first temperature threshold, turn on the chassis electric heater.

[0011] When the outdoor ambient temperature is lower than the second temperature threshold, the outdoor auxiliary heat exchanger is turned on; the second temperature threshold is lower than the first temperature threshold.

[0012] In one possible implementation, the method is characterized by further comprising:

[0013] The opening degrees of the first and second electronic expansion valves are controlled according to the superheat to regulate the superheat.

[0014] In one possible implementation, the superheat is obtained by calculating the difference between the compressor suction temperature and the outdoor coil temperature.

[0015] In one possible implementation, the method further includes:

[0016] When the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, and the outdoor ambient temperature is higher than or equal to a second temperature threshold, the outdoor auxiliary heat exchanger is turned on.

[0017] In one possible implementation, controlling the opening degree of the first and second electronic expansion valves based on superheat includes:

[0018] Based on the fact that the superheat is greater than a first superheat threshold, or the superheat is less than a second superheat threshold, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is controlled to decrease.

[0019] Based on the fact that the superheat is less than or equal to a first superheat threshold and the superheat is greater than or equal to a second superheat threshold, the first electronic expansion valve and / or the second electronic expansion valve are controlled to maintain their current opening.

[0020] Wherein, the first superheat threshold is greater than the second superheat threshold.

[0021] In one possible implementation, the compressor is an EVI enthalpy-increasing compressor.

[0022] A second aspect of this application provides an air conditioning heating control system, comprising: a control unit, a first pressure sensor, a second pressure sensor, a compressor, and a flash evaporator;

[0023] The first pressure sensor is used to collect the compressor discharge pressure;

[0024] The second pressure sensor is used to collect the compressor's suction pressure;

[0025] The control unit is used to open the third electronic expansion valve when the ratio of the compressor discharge pressure to the compressor suction pressure is lower than a preset threshold and the compressor suction pressure is less than or equal to the pressure threshold, so as to replenish gaseous refrigerant from the flash evaporator to the compressor compression chamber to increase the refrigerant circulation volume.

[0026] In one possible implementation, the system further includes: an outdoor auxiliary heat exchanger and a chassis electric heater;

[0027] The control unit is also used to turn on the chassis electric heater when the outdoor ambient temperature is lower than the first temperature threshold to prevent ice buildup on the chassis of the outdoor main heat exchanger; and to turn on the outdoor auxiliary heat exchanger when the outdoor ambient temperature is lower than the second temperature threshold; wherein the second temperature threshold is lower than the first temperature threshold.

[0028] A third aspect of this application provides a readable storage medium storing instructions that, when executed on an electronic device, cause the electronic device to perform an air conditioning heating control method as described in any of the first aspects of the embodiments of this application.

[0029] Compared with the prior art, this application has the following beneficial effects:

[0030] This application provides an air conditioning heating control method that, when the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, opens a third electronic expansion valve to replenish gaseous refrigerant from the flash evaporator into the compressor compression chamber, thereby increasing the refrigerant circulation volume. This addresses the issue of insufficient refrigerant circulation flow due to low system pressure in low-temperature environments by increasing the refrigerant circulation flow, increasing system pressure, allowing the compressor to perform more work, and raising the discharge temperature, thus improving the heating effect. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A structural diagram of an air conditioning heating control system provided in an embodiment of this application;

[0033] Figure 2 A flowchart of an air conditioning heating control method provided in an embodiment of this application.

[0034] Figure 3 A flowchart of another air conditioning heating control method provided in the embodiments of this application. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] As mentioned earlier, the heating temperature range of ordinary heat pump air conditioners is currently limited. At lower ambient temperatures, the heat exchanger outdoors has a poorer heat exchange effect, which causes a significant reduction in the heating capacity of the air conditioner and a worse heating effect.

[0037] There are two main reasons why ordinary air conditioners have poor heating performance in low-temperature environments:

[0038] In ordinary air conditioners, the low-pressure level can drop to around 0.2 MPa (R410A refrigerant) when the temperature is below -20°C. Under such low pressure, the circulation flow of the refrigerant in the system is severely insufficient, resulting in a significant reduction in heating capacity and a poorer heating effect.

[0039] When the outdoor ambient temperature is extremely low, the water produced during the defrosting of the outdoor heat exchanger in a regular air conditioner cannot drain away in time and will re-ice up. Over time, this water accumulates and covers the heat exchanger, resulting in poor heat exchange efficiency, reduced heating capacity, and decreased heating performance.

[0040] In view of this, embodiments of this application provide an air conditioning heating control method, system, and readable storage medium. The method includes: when the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, opening a third electronic expansion valve to replenish gaseous refrigerant from the flash evaporator to the compressor compression chamber, thereby increasing the refrigerant circulation volume. This addresses the situation where low system pressure leads to insufficient refrigerant circulation flow in low-temperature environments, by increasing the refrigerant circulation flow, increasing system pressure, allowing the compressor to perform more work, and raising the discharge temperature, thereby improving the heating effect.

[0041] For ease of understanding, the following describes an air conditioning heating control system architecture provided in the embodiments of this application.

[0042] See Figure 1 , Figure 1 This application provides a structural diagram of an air conditioning heating control system according to an embodiment. Figure 1 As shown, the air conditioning heating control system includes: a control unit, a compressor, a flash evaporator, an outdoor main heat exchanger, an outdoor auxiliary heat exchanger, a chassis electric heater, an indoor heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a third electronic expansion valve, a solenoid valve, a first pressure sensor, and a second pressure sensor.

[0043] The compressor output is connected to the indoor heat exchanger input. The second electronic expansion valve at the indoor heat exchanger output is connected to the flash evaporator input. The first output of the flash evaporator is connected to the outdoor main heat exchanger and the outdoor auxiliary heat exchanger input via the first electronic expansion valve. The outputs of the outdoor main heat exchanger and the outdoor auxiliary heat exchanger are connected to the four-way valve vapor-liquid separator input. The vapor-liquid separator output is connected to the compressor first input. The second output of the flash evaporator is connected to the compressor second input via the third electronic expansion valve.

[0044] A first temperature sensor and a first pressure sensor are installed at the compressor output end (exhaust pipe); a second temperature sensor and a second pressure sensor are installed at the compressor first input end (first suction pipe).

[0045] The control system connects the outdoor auxiliary heat exchanger by opening a solenoid valve.

[0046] Under normal heating conditions, the air conditioner operates on the following principle:

[0047] The high-temperature, high-pressure gaseous refrigerant discharged from the compressor flows into the indoor heat exchanger, where it releases heat and becomes high-pressure, room-temperature liquid refrigerant. After being throttled by the second electronic expansion valve, it enters the flash evaporator and becomes low-pressure, low-temperature two-phase refrigerant. The low-pressure, low-temperature liquid refrigerant is throttled by the first electronic expansion valve and flows into the outdoor heat exchanger, where it absorbs heat from the environment and becomes low-temperature, low-pressure gas. Then, it passes through a four-way valve and flows into the vapor-liquid separator to complete the separation of gaseous and liquid phases. The gaseous refrigerant then enters the compressor to complete one cycle.

[0048] At lower temperatures, the principle of air conditioning heating is as follows:

[0049] The first pressure sensor is used to collect the compressor discharge pressure;

[0050] The second pressure sensor is used to collect the compressor suction pressure;

[0051] The control unit is used to open the third electronic expansion valve when the ratio of the compressor discharge pressure to the compressor suction pressure is lower than a preset threshold and the compressor suction pressure is less than or equal to the pressure threshold, so as to replenish gaseous refrigerant from the flash evaporator to the compressor compression chamber to increase the refrigerant circulation.

[0052] In this embodiment of the application, under low pressure conditions caused by low temperature, the third electronic expansion valve is opened, connecting the flash evaporator and the compressor. The low-pressure, low-temperature gaseous refrigerant in the flash evaporator is then added to the compressor to increase the refrigerant circulation volume.

[0053] In one example, the current refrigerant circulation volume of the system can be calculated by the compressor's suction and discharge pressures. When the refrigerant circulation volume is insufficient, the third electronic expansion valve can be opened to supplement gaseous refrigerant from the flash evaporator into the compressor's compression chamber to increase the refrigerant circulation volume.

[0054] In some embodiments, the compressor is an EVI enthalpy-increasing compressor. An EVI enthalpy-increasing compressor is a refrigerant enthalpy-increasing compressor that allows gaseous refrigerant to be drawn in through an enthalpy-increasing injection port other than the suction port and directly enter the compression chamber.

[0055] In some embodiments, the control unit is further configured to turn on the chassis electric heater when the outdoor ambient temperature is lower than a first temperature threshold to prevent ice buildup on the chassis of the outdoor main heat exchanger; and to turn on the outdoor auxiliary heat exchanger when the outdoor ambient temperature is lower than a second temperature threshold; wherein the second temperature threshold is lower than the first temperature threshold.

[0056] In this embodiment of the application, the chassis electric heater is turned on at a lower temperature to prevent ice buildup on the chassis of the main outdoor heat exchanger. An auxiliary outdoor heat exchanger can also be used, and the simultaneous operation of the two heat exchangers can enhance the heating effect.

[0057] In some embodiments, the control unit is further configured to control the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the superheat, so as to regulate the superheat.

[0058] In one example, the correspondence between superheat and the opening degree of the first electronic expansion valve and the second electronic expansion valve can be preset.

[0059] In some embodiments, the control unit is specifically used to obtain the superheat by calculating the difference between the compressor suction temperature and the outdoor coil temperature.

[0060] In one example, the compressor suction temperature is measured by a second temperature sensor located on the compressor suction pipe, and the outdoor temperature is measured by a temperature sensor located on the outdoor coil.

[0061] In one example, the superheat is calculated as follows: △T=Ts-Tcm, where △T is the superheat, Ts represents the compressor suction temperature, and Tcm represents the outdoor coil temperature.

[0062] The electronic expansion valve used in this application has the following advantages:

[0063] Electronic expansion valves offer rapid response and action, eliminate static overheating, and allow for adjustable opening and closing characteristics and speeds, making them particularly suitable for heat pump units operating under drastically fluctuating conditions. The temperature sensing element of the electronic expansion valve is a thermocouple resistance thermometer, which accurately reflects temperature changes even at low temperatures. Therefore, electronic expansion valves provide excellent flow control even in low-temperature environments. The overheat setpoint of the electronic expansion valve is adjustable.

[0064] In some embodiments, when the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, and the outdoor ambient temperature is higher than or equal to a second temperature threshold, the outdoor auxiliary heat exchanger is turned on.

[0065] In this embodiment of the application, when the outdoor temperature is lower than the second temperature threshold, or when the ratio of the compressor discharge pressure to the compressor suction pressure is lower than the preset threshold and the compressor suction pressure is less than or equal to the pressure threshold, the solenoid valve can be opened to connect the outdoor heat exchange auxiliary device to enhance the heating effect.

[0066] In some embodiments, based on the superheat being greater than a first superheat threshold or the superheat being less than a second superheat threshold, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is controlled to decrease.

[0067] Based on the fact that the superheat is less than or equal to a first superheat threshold and the superheat is greater than or equal to a second superheat threshold, the first electronic expansion valve and / or the second electronic expansion valve are controlled to maintain their current opening; wherein the first superheat threshold is greater than the second superheat threshold.

[0068] This application employs compressor enthalpy enhancement technology to increase the refrigerant circulation flow rate, thereby improving heating capacity and the air conditioner's heating effect. An auxiliary heat exchanger is installed to increase heat exchange at low temperatures, further enhancing heating capacity and the air conditioner's heating effect. A heater is installed between the lower part of the outdoor heat exchanger and the chassis to prevent prolonged ice buildup, ensuring the outdoor heat exchanger's heat exchange efficiency and preventing heat capacity attenuation. This allows the heat pump air conditioner to operate well in ambient temperatures below -20°C, and even at ambient temperatures as low as -35°C, maintaining good heating performance. The auxiliary heat exchanger participates in heat exchange as needed, increasing low-temperature heating capacity and improving the overall heating effect. An electric heater on the chassis prevents ice buildup during prolonged operation at extremely low ambient temperatures.

[0069] See Figure 2 , Figure 2 This is a flowchart illustrating an air conditioning heating control method provided in an embodiment of this application. This method can be applied to the control unit of an air conditioner, such as... Figure 2 As shown, the method includes:

[0070] S210, Collect compressor discharge pressure;

[0071] S220, Collect compressor suction pressure;

[0072] S230. When the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to the pressure threshold, the third electronic expansion valve is opened to supplement gaseous refrigerant from the flash evaporator into the compressor compression chamber to increase the refrigerant circulation.

[0073] In this embodiment of the application, under low pressure conditions caused by low temperature, the third electronic expansion valve is opened, connecting the flash evaporator and the compressor. The low-pressure, low-temperature gaseous refrigerant in the flash evaporator is then added to the compressor to increase the refrigerant circulation volume.

[0074] In some embodiments, the method further includes:

[0075] When the outdoor ambient temperature is lower than the first temperature threshold, turn on the chassis electric heater.

[0076] When the outdoor ambient temperature is lower than the second temperature threshold, the outdoor auxiliary heat exchanger is turned on; the second temperature threshold is lower than the first temperature threshold.

[0077] In this embodiment of the application, the chassis electric heater is turned on at a lower temperature to prevent ice buildup on the chassis of the main outdoor heat exchanger. An auxiliary outdoor heat exchanger can also be used, and the simultaneous operation of the two heat exchangers can enhance the heating effect.

[0078] In some embodiments, the method further includes:

[0079] The opening degrees of the first and second electronic expansion valves are controlled based on the superheat to regulate the superheat. The superheat is obtained by calculating the difference between the compressor suction temperature and the outdoor coil temperature.

[0080] Based on the fact that the superheat is greater than a first superheat threshold, or the superheat is less than a second superheat threshold, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is controlled to decrease.

[0081] Based on the fact that the superheat is less than or equal to a first superheat threshold and the superheat is greater than or equal to a second superheat threshold, the first electronic expansion valve and / or the second electronic expansion valve are controlled to maintain their current opening; wherein the first superheat threshold is greater than the second superheat threshold.

[0082] In one example, the correspondence between superheat and the opening degree of the first electronic expansion valve and the second electronic expansion valve can be preset.

[0083] In one example, the superheat is calculated as follows: △T=Ts-Tcm, where △T is the superheat, Ts represents the compressor suction temperature, and Tcm represents the outdoor coil temperature.

[0084] In some embodiments, the compressor is an EVI enthalpy-increasing compressor.

[0085] In some embodiments, the method further includes:

[0086] When the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, and the outdoor ambient temperature is higher than or equal to a second temperature threshold, the outdoor auxiliary heat exchanger is turned on.

[0087] The electronic expansion valve used in this application has the following advantages:

[0088] Electronic expansion valves offer rapid response and action, eliminate static overheating, and allow for adjustable opening and closing characteristics and speeds, making them particularly suitable for heat pump units operating under drastically fluctuating conditions. The temperature sensing element of the electronic expansion valve is a thermocouple resistance thermometer, which accurately reflects temperature changes even at low temperatures. Therefore, electronic expansion valves provide excellent flow control even in low-temperature environments. The overheat setpoint of the electronic expansion valve is adjustable.

[0089] See Figure 3 , Figure 3 A flowchart illustrating another air conditioning heating control method provided in this application embodiment. Figure 3 As shown, there are three control mechanisms for air conditioning heating control:

[0090] 1) Collect the outdoor ambient temperature. When the outdoor ambient temperature is lower than the first temperature threshold, control the chassis electric heater to turn on. When the outdoor ambient temperature is lower than the second preset threshold, control the solenoid valve to turn on, so that the outdoor auxiliary heat exchanger can join the heating work to enhance the heating effect.

[0091] 2) Collect the compressor's suction pressure and discharge pressure. When the ratio of suction pressure to discharge pressure is lower than the preset threshold, open the third electronic expansion valve to connect the flash evaporator and the compressor. The low-pressure, low-temperature gaseous refrigerant in the flash evaporator is then added to the compressor to increase the refrigerant circulation.

[0092] 3) Calculate the superheat and adjust the opening of the first electronic expansion valve and the second electronic expansion valve according to the superheat to keep the superheat within a safe range.

[0093] This application employs compressor enthalpy enhancement technology to increase the refrigerant circulation flow rate, thereby improving heating capacity and the air conditioner's heating effect. An auxiliary heat exchanger is installed to increase heat exchange at low temperatures, further enhancing heating capacity and the air conditioner's heating effect. A heater is installed between the lower part of the outdoor heat exchanger and the chassis to prevent prolonged ice buildup, ensuring the outdoor heat exchanger's heat exchange efficiency and preventing heat capacity attenuation. This allows the heat pump air conditioner to operate well in ambient temperatures below -20°C, and even at ambient temperatures as low as -35°C, maintaining good heating performance. The auxiliary heat exchanger participates in heat exchange as needed, increasing low-temperature heating capacity and improving the overall heating effect. An electric heater on the chassis prevents ice buildup during prolonged operation at extremely low ambient temperatures.

[0094] It should be noted that computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include, but are not limited to, object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0095] It should be noted that the computer-readable medium of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0096] It should be noted that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description.

[0097] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0098] It should be noted that although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0099] While several specific implementation details are included in the foregoing discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0100] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An air conditioning heating control method, characterized in that, This technology is applied to air conditioners, which include a compressor, an indoor heat exchanger, a flash evaporator, an outdoor main heat exchanger, an outdoor auxiliary heat exchanger, and a vapor-liquid separator. The output end of the compressor is connected to the input end of the indoor heat exchanger. The output end of the indoor heat exchanger is connected to the input end of the flash evaporator via a second electronic expansion valve. The first output end of the flash evaporator is connected to the input end of the outdoor main heat exchanger and the input end of the outdoor auxiliary heat exchanger via a first electronic expansion valve. The output ends of the outdoor main heat exchanger and the outdoor auxiliary heat exchanger are connected to the input end of the vapor-liquid separator via a four-way valve. The output end of the vapor-liquid separator is connected to the first input end of the compressor. The second output end of the flash evaporator is connected to the second input end of the compressor via a third electronic expansion valve. The method includes: Collect the compressor discharge pressure and compressor suction pressure; When the ratio of compressor discharge pressure to compressor suction pressure is lower than the preset value, and the compressor suction pressure is less than or equal to the pressure threshold, the third electronic expansion valve is opened, so that gaseous refrigerant is replenished from the flash evaporator to the compressor compression chamber to increase the refrigerant circulation volume. The method further includes: When the ratio of compressor discharge pressure to compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, and the outdoor ambient temperature is higher than or equal to a second temperature threshold, the outdoor auxiliary heat exchanger is turned on.

2. The method according to claim 1, characterized in that, The method further includes: When the outdoor ambient temperature is lower than the first temperature threshold, turn on the chassis electric heater. When the outdoor ambient temperature is lower than the second temperature threshold, the outdoor auxiliary heat exchanger is turned on; the second temperature threshold is lower than the first temperature threshold.

3. The method according to claim 1, characterized in that, The method further includes: The opening degrees of the first and second electronic expansion valves are controlled according to the superheat to regulate the superheat.

4. The method according to claim 3, characterized in that, The superheat is obtained by calculating the difference between the compressor suction temperature and the outdoor coil temperature.

5. The method according to claim 3, characterized in that, The control of the opening degree of the first electronic expansion valve and the second electronic expansion valve based on superheat includes: Based on the fact that the superheat is greater than a first superheat threshold, or the superheat is less than a second superheat threshold, the opening degree of the first electronic expansion valve and / or the second electronic expansion valve is controlled to decrease. Based on the fact that the superheat is less than or equal to a first superheat threshold and the superheat is greater than or equal to a second superheat threshold, the first electronic expansion valve and / or the second electronic expansion valve are controlled to maintain their current opening. Wherein, the first superheat threshold is greater than the second superheat threshold.

6. The method according to any one of claims 1-5, characterized in that, The compressor is an EVI enthalpy-increasing compressor.

7. An air conditioning heating control system, characterized in that, include: Applied to air conditioners, the air conditioner includes a compressor, an indoor heat exchanger, a flash evaporator, an outdoor main heat exchanger, an outdoor auxiliary heat exchanger, a vapor-liquid separator, a control unit, a first pressure sensor, and a second pressure sensor; The output end of the compressor is connected to the input end of the indoor heat exchanger. The output end of the indoor heat exchanger is connected to the input end of the flash evaporator via a second electronic expansion valve. The first output end of the flash evaporator is connected to the input end of the outdoor main heat exchanger and the input end of the outdoor auxiliary heat exchanger via a first electronic expansion valve. The output ends of the outdoor main heat exchanger and the outdoor auxiliary heat exchanger are connected to the input end of the vapor-liquid separator via a four-way valve. The output end of the vapor-liquid separator is connected to the first input end of the compressor. The second output end of the flash evaporator is connected to the second input end of the compressor via a third electronic expansion valve. The first pressure sensor is used to collect the compressor discharge pressure; The second pressure sensor is used to collect the compressor's suction pressure; The control unit is used to open the third electronic expansion valve when the ratio of the compressor discharge pressure to the compressor suction pressure is lower than a preset threshold and the compressor suction pressure is less than or equal to the pressure threshold, so as to replenish gaseous refrigerant from the flash evaporator to the compressor compression chamber to increase the refrigerant circulation volume. The control unit is also used to connect the outdoor auxiliary heat exchanger when the ratio of the compressor discharge pressure to the compressor suction pressure is lower than a preset threshold, and the compressor suction pressure is less than or equal to a pressure threshold, and the outdoor ambient temperature is higher than or equal to a second temperature threshold.

8. The system according to claim 7, characterized in that, The system also includes: an outdoor auxiliary heat exchanger and a chassis electric heater; The control unit is also used to turn on the chassis electric heater when the outdoor ambient temperature is lower than the first temperature threshold to prevent ice buildup on the chassis of the outdoor main heat exchanger; and to turn on the outdoor auxiliary heat exchanger when the outdoor ambient temperature is lower than the second temperature threshold; wherein the second temperature threshold is lower than the first temperature threshold.

9. A readable storage medium, characterized in that, The readable storage medium stores instructions that, when executed on an electronic device, cause the electronic device to perform the air conditioning heating control method according to any one of claims 1-6.

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