An air conditioning system and a control method, device, storage medium and program product thereof

Abstract

The application discloses an air conditioning system and a control method, device, storage medium and computer program product thereof. The method comprises the following steps: in the case that the air conditioning system runs in the heating mode after starting, acquiring the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, acquiring the first suction temperature of the compressor, and acquiring the pipe temperature of the outdoor heat exchanger at a set period; based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, controlling the rotating speed of the inner and outer fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device. According to the scheme, three throttling devices and an auxiliary throttling device are arranged, the air supplement of the compressor is controlled, and the heating performance is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioning systems, and particularly relates to a control method and device of an air conditioning system, the air conditioning system, a storage medium and a computer program product, in particular to a control method and device for improving the heating capacity of a three-cylinder air supplementing dual-temperature air conditioning system, the air conditioning system, a storage medium and a computer program product. BACKGROUND

[0002] In the related scheme, the outdoor unit of the air conditioning system adopts a three-cylinder compressor + flash evaporator (also referred to as a "flash evaporator"), and the indoor unit adopts a dual-temperature evaporator, in combination with multiple throttings, to improve the system energy efficiency during refrigeration operation. However, in actual use, because the selection of parts of the air conditioning system is mainly designed for refrigeration working conditions, there may be problems such as low heating capacity caused by unreasonable air supplementing amount during heating operation, thereby causing the problem of insufficient heating capacity.

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

[0004] The purpose of the present application is to provide a control method and device of an air conditioning system, the air conditioning system, a storage medium and a computer program product, to solve the problem of insufficient heating capacity caused by unreasonable air supplementing amount during heating operation of the air conditioning system (such as a three-cylinder air supplementing dual-temperature air conditioning system), to achieve the effect of improving the heating performance by setting three throttings and an auxiliary throtting, and controlling the air supplementing amount of the compressor.

[0005] The application provides a control method of an air conditioning system, the air conditioning system having a compressor, an outdoor heat exchanger, a double indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device, the double indoor heat exchanger comprising a first indoor heat exchanger and a second indoor heat exchanger, the first throttling device being arranged on a pipeline between the flash evaporator and the outdoor heat exchanger, the second throttling device being arranged on a pipeline between the double indoor heat exchanger and the flash evaporator, the third throttling device being arranged on a pipeline on a side connected with the second throttling device of the second indoor heat exchanger, and the auxiliary throttling device being used for assisting in adjusting a charge amount of the compressor; the control method of the air conditioning system comprising: in the case that the air conditioning system runs in a heating mode after starting, acquiring an outdoor environment temperature of the air conditioning system or an exhaust temperature of the compressor, acquiring a first suction temperature of the compressor, and acquiring a tube temperature of the outdoor heat exchanger at a set period; and controlling a rotating speed of an indoor and outdoor fan of the air conditioning system, a frequency of the compressor, an opening degree of the first throttling device, an opening degree of the second throttling device and an opening degree of the third throttling device based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger.

[0006] In some embodiments, the auxiliary throttling device comprises a first capillary tube, a one-way valve and a three-way valve; a bypass pipeline is arranged on a pipeline where the first throttling device, the flash evaporator and the second throttling device are located; the first capillary tube and the one-way valve are arranged in series on the bypass pipeline; a first valve port of the three-way valve is connected with the outdoor heat exchanger, a second valve port of the three-way valve is connected with an outlet of the one-way valve, the first capillary tube is connected with an inlet of the one-way valve, and a third valve port of the three-way valve is connected with the first throttling device; based on an outdoor environment temperature of the air conditioning system or an exhaust temperature of the compressor, and according to a first suction temperature of the compressor and a tube temperature of the outdoor heat exchanger, the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device of the air conditioning system are controlled, including: determining whether the outdoor environment temperature of the air conditioning system is less than or equal to a set outdoor environment low temperature threshold value; if it is determined that the outdoor environment temperature of the air conditioning system is less than or equal to the set outdoor environment low temperature threshold value, the rotation speed of the indoor and outdoor fans is controlled to be a respective set rotation speed, the frequency of the compressor is controlled to be a set frequency, the opening degree of the first throttling device is controlled to be a set first initial opening degree, the opening degree of the second throttling device is controlled to be 0, and the opening degree of the third throttling device is controlled to be a set maximum opening degree; after a set time length, the opening degree of the first throttling device is adjusted according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger; if it is determined that the outdoor environment temperature of the air conditioning system is greater than the set outdoor environment low temperature threshold value, the rotation speed of the indoor and outdoor fans is controlled to be a respective set rotation speed, the frequency of the compressor is controlled to be a set frequency, the opening degree of the first throttling device is controlled to be a set second initial opening degree, the opening degree of the second throttling device is controlled to be 0, and the opening degree of the third throttling device is controlled to be a set maximum opening degree.

[0007] In some embodiments, the opening degree of the first throttling device is adjusted according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, including: determining the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, denoted as the heating suction temperature difference of the air conditioning system; determining whether the heating suction temperature difference of the air conditioning system is greater than a set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, then the opening degree of the first throttling device is controlled to be opened by a set value based on the current value, and then it is re-determined whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, then the opening degree of the first throttling device is controlled to maintain the current value; if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, then the opening degree of the first throttling device is controlled to be closed by a set value based on the current value, and then it is re-determined whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value.

[0008] In some embodiments, the auxiliary throttling device further includes: a second capillary tube or a fourth throttling device; or, the auxiliary throttling device further includes: a third capillary tube or a fifth throttling device; the second capillary tube or the fourth throttling device is arranged in the pipeline between the flash evaporator and the compressor; the third capillary tube or the fifth throttling device is arranged in the pipeline between the double- chamber indoor heat exchanger and the second throttling device; the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device of the air conditioning system are controlled based on the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, further including: the rotation speed of the indoor and outdoor fans is controlled to be a respective set rotation speed, the frequency of the compressor is controlled to be a set frequency, the opening degree of the first throttling device and the opening degree of the second throttling device are controlled to be respective set opening degrees, and the opening degree of the third throttling device is controlled to be a set maximum opening degree; after a set time period, the opening degree of the second throttling device is adjusted according to the exhaust temperature of the compressor; after a set time period, the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger is determined, denoted as the heating suction temperature difference of the air conditioning system; and the opening degree of the first throttling device is adjusted according to the heating suction temperature difference of the air conditioning system; after a set time period, it is determined whether the exhaust temperature of the compressor reaches a set exhaust temperature target value and the heating suction temperature difference of the air conditioning system reaches a set heating suction target value: if so, the current operation is maintained; if not, it is returned to re-determine the heating suction temperature difference of the air conditioning system.

[0009] In some embodiments, wherein the opening of the second throttling device is adjusted according to the discharge temperature of the compressor, comprises: determining the size relationship between the discharge temperature of the compressor and the set first discharge temperature threshold, the set second discharge temperature threshold, the set third discharge temperature threshold; wherein the set first discharge temperature threshold is less than the set second discharge temperature threshold, the set first discharge temperature threshold is greater than the set third discharge temperature threshold, and the set discharge temperature target value is the set third discharge temperature threshold; if it is determined that the discharge temperature of the compressor is greater than or equal to the set first discharge temperature threshold and less than the set second discharge temperature threshold, the opening of the second throttling device is increased by a set first opening value based on the current value; if it is determined that the discharge temperature of the compressor is greater than or equal to the set second discharge temperature threshold, the opening of the second throttling device is increased by a set second opening value based on the current value, and the set second opening value is greater than the set first opening value; if it is determined that the discharge temperature of the compressor is less than the set third discharge temperature threshold, the current value of the opening of the second throttling device is restored to the set opening of the second throttling device; and / or, wherein the opening of the first throttling device is adjusted according to the heating suction temperature difference of the air conditioning system, comprises: determining whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, the opening of the first throttling device is controlled to be opened by a set value based on the current value; if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, the opening of the first throttling device is controlled to maintain the current value; if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, the opening of the first throttling device is controlled to be closed by a set value based on the current value.

[0010] In some embodiments, further comprising: in the case that the air conditioning system runs in the refrigeration mode after starting, acquiring the outlet temperature of the outdoor heat exchanger, acquiring the tube temperature of the first indoor heat exchanger, acquiring the tube temperature of the second indoor heat exchanger, acquiring the charge temperature of the flash tank, acquiring the first suction temperature of the compressor, and acquiring the second suction temperature of the compressor at a set period; controlling the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the charge temperature of the flash tank, the first suction temperature of the compressor, and the second suction temperature of the compressor.

[0011] In some embodiments, the control of the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device, in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, comprises: controlling the rotation speed of the indoor and outdoor fans to be the respective set rotation speed, the frequency of the compressor to be the set frequency, and the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device to be the respective set opening degree; after a set time period, determining the average value of the tube temperature of the first indoor heat exchanger and the tube temperature of the second indoor heat exchanger as a first average value, determining the average value of the first average value and the outlet temperature of the outdoor heat exchanger as a second average value, determining the difference between the second average value and the temperature of the flash evaporator as the temperature difference of the air conditioner system; adjusting the opening degree of the first throttling device according to the temperature difference of the air conditioner system; after a set time period, determining the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger as the first refrigeration suction temperature difference of the air conditioner system; and adjusting the opening degree of the second throttling device according to the first refrigeration suction temperature difference of the air conditioner system; after a set time period, determining the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger as the second refrigeration suction temperature difference of the air conditioner system; and adjusting the opening degree of the third throttling device according to the second refrigeration suction temperature difference of the air conditioner system; after a set time period, determining whether the temperature difference of the air conditioner system reaches the set target value of the temperature difference, the second refrigeration suction temperature difference of the air conditioner system reaches the set first refrigeration suction target value, and the second refrigeration suction temperature difference of the air conditioner system reaches the set second refrigeration suction target value; if yes, maintaining the current operation; if no, returning to re-determine the temperature difference of the air conditioner system.

[0012] In some embodiments, wherein the opening degree of the first throttling device is adjusted according to the air supplement temperature difference of the air conditioning system, comprises: determining whether the air supplement temperature difference of the air conditioning system is greater than a set air supplement target value; if it is determined that the air supplement temperature difference of the air conditioning system is greater than the set air supplement target value, then controlling the opening degree of the first throttling device to be opened by a set value on the basis of the current value; if it is determined that the air supplement temperature difference of the air conditioning system is equal to the set air supplement target value, then controlling the opening degree of the first throttling device to maintain the current value; if it is determined that the air supplement temperature difference of the air conditioning system is less than the set air supplement target value, then controlling the opening degree of the first throttling device to be closed by a set value on the basis of the current value; and / or, wherein the opening degree of the second throttling device is adjusted according to the first refrigeration suction temperature difference of the air conditioning system, comprises: determining whether the first refrigeration suction temperature difference of the air conditioning system is greater than a set first refrigeration suction target value; if it is determined that the first refrigeration suction temperature difference of the air conditioning system is greater than the set first refrigeration suction target value, then controlling the opening degree of the second throttling device to be opened by a set value on the basis of the current value; if it is determined that the first refrigeration suction temperature difference of the air conditioning system is equal to the set first refrigeration suction target value, then controlling the opening degree of the second throttling device to maintain the current value; if it is determined that the first refrigeration suction temperature difference of the air conditioning system is less than the set first refrigeration suction target value, then controlling the opening degree of the second throttling device to be closed by a set value on the basis of the current value; and / or, wherein the opening degree of the third throttling device is adjusted according to the second refrigeration suction temperature difference of the air conditioning system, comprises: determining whether the second refrigeration suction temperature difference of the air conditioning system is greater than a set second refrigeration suction target value; if it is determined that the second refrigeration suction temperature difference of the air conditioning system is greater than the set second refrigeration suction target value, then controlling the opening degree of the third throttling device to be opened by a set value on the basis of the current value; if it is determined that the second refrigeration suction temperature difference of the air conditioning system is equal to the set second refrigeration suction target value, then controlling the opening degree of the third throttling device to maintain the current value; if it is determined that the second refrigeration suction temperature difference of the air conditioning system is less than the set second refrigeration suction target value, then controlling the opening degree of the third throttling device to be closed by a set value on the basis of the current value.

[0013] To match the above method, another aspect of the present application provides a control device of an air conditioning system, the air conditioning system having a compressor, an outdoor heat exchanger, a double indoor heat exchanger, a flash tank, a first throttling device, a second throttling device, a third throttling device, and an auxiliary throttling device, the double indoor heat exchanger including a first indoor heat exchanger and a second indoor heat exchanger, the first throttling device being arranged on a pipeline between the flash tank and the outdoor heat exchanger, the second throttling device being arranged on a pipeline between the double indoor heat exchanger and the flash tank, the third throttling device being arranged on a pipeline on a side connected to the second throttling device of the second indoor heat exchanger, and the auxiliary throttling device being used to assist in adjusting a charge amount of the compressor; the control device of the air conditioning system including: an acquisition unit configured to acquire an outdoor ambient temperature of the air conditioning system or an exhaust temperature of the compressor, acquire a first suction temperature of the compressor, and acquire a tube temperature of the outdoor heat exchanger at a set period in a case where the air conditioning system runs in a heating mode after starting up; and a control unit configured to control a rotation speed of an indoor and outdoor fan of the air conditioning system, a frequency of the compressor, an opening degree of the first throttling device, an opening degree of the second throttling device, and an opening degree of the third throttling device based on the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger.

[0014] In some embodiments, the auxiliary throttling device comprises a first capillary tube, a one-way valve and a three-way valve; a bypass pipeline is arranged on a pipeline where the first throttling device, the flash evaporator and the second throttling device are located; the first capillary tube and the one-way valve are arranged in series on the bypass pipeline; a first valve port of the three-way valve is connected with the outdoor heat exchanger, a second valve port of the three-way valve is connected with an outlet of the one-way valve, the first capillary tube is connected with an inlet of the one-way valve, and a third valve port of the three-way valve is connected with the first throttling device; the control unit controls the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device of the air conditioning system based on the outdoor ambient temperature of the air conditioning system or the discharge temperature of the compressor and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, including: determining whether the outdoor ambient temperature of the air conditioning system is less than or equal to a set outdoor ambient low temperature threshold value; if it is determined that the outdoor ambient temperature of the air conditioning system is less than or equal to the set outdoor ambient low temperature threshold value, the rotation speed of the indoor and outdoor fans is controlled to be a respective set rotation speed, the frequency of the compressor is controlled to be a set frequency, the opening degree of the first throttling device is controlled to be a set first initial opening degree, the opening degree of the second throttling device is controlled to be 0, and the opening degree of the third throttling device is controlled to be a set maximum opening degree; after a set time length, the opening degree of the first throttling device is adjusted according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger; if it is determined that the outdoor ambient temperature of the air conditioning system is greater than the set outdoor ambient low temperature threshold value, the rotation speed of the indoor and outdoor fans is controlled to be a respective set rotation speed, the frequency of the compressor is controlled to be a set frequency, the opening degree of the first throttling device is controlled to be a set second initial opening degree, the opening degree of the second throttling device is controlled to be 0, and the opening degree of the third throttling device is controlled to be a set maximum opening degree.

[0015] In some embodiments, the control unit adjusts the opening degree of the first throttling device according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, including: determining the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, denoted as the heating suction temperature difference of the air conditioning system; determining whether the heating suction temperature difference of the air conditioning system is greater than a set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, then the opening degree of the first throttling device is controlled to be opened by a set value based on the current value, and then it is re-determined whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, then the opening degree of the first throttling device is controlled to maintain the current value; if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, then the opening degree of the first throttling device is controlled to be closed by a set value based on the current value, and then it is re-determined whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value.

[0016] In some embodiments, the auxiliary throttling device further includes: a second capillary tube or a fourth throttling device; or, the auxiliary throttling device further includes: a third capillary tube or a fifth throttling device; the second capillary tube or the fourth throttling device is arranged in the pipeline between the flash evaporator and the compressor; the third capillary tube or the fifth throttling device is arranged in the pipeline between the double- chamber indoor heat exchanger and the second throttling device; the control unit controls the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degrees of the first, second and third throttling devices based on the outdoor environment temperature of the air conditioning system or the discharge temperature of the compressor and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, further including: controlling the rotation speed of the indoor and outdoor fans to be the respective set rotation speeds, the frequency of the compressor to be a set frequency, the opening degrees of the first and second throttling devices to be the respective set opening degrees, and the opening degree of the third throttling device to be a set maximum opening degree; after a set time period, adjusting the opening degree of the second throttling device according to the discharge temperature of the compressor; after a set time period, determining the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, denoted as the heating suction temperature difference of the air conditioning system; and adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system; after a set time period, determining whether the discharge temperature of the compressor reaches a set discharge temperature target value and the heating suction temperature difference of the air conditioning system reaches a set heating suction target value: if yes, maintaining the current operation; if no, returning to re-determine the heating suction temperature difference of the air conditioning system.

[0017] In some embodiments, the control unit adjusts the opening degree of the second throttling device according to the discharge temperature of the compressor, including: determining the size relationship between the discharge temperature of the compressor and a set first discharge temperature threshold, a set second discharge temperature threshold, and a set third discharge temperature threshold; wherein the set first discharge temperature threshold is less than the set second discharge temperature threshold, the set first discharge temperature threshold is greater than the set third discharge temperature threshold, and the set discharge temperature target value is the set third discharge temperature threshold; if it is determined that the discharge temperature of the compressor is greater than or equal to the set first discharge temperature threshold and less than the set second discharge temperature threshold, the opening degree of the second throttling device is increased by a set first opening degree value based on the current value; if it is determined that the discharge temperature of the compressor is greater than or equal to the set second discharge temperature threshold, the opening degree of the second throttling device is increased by a set second opening degree value based on the current value, and the set second opening degree value is greater than the set first opening degree value; if it is determined that the discharge temperature of the compressor is less than the set third discharge temperature threshold, the current value of the opening degree of the second throttling device is restored to the set opening degree of the second throttling device; and / or the control unit adjusts the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system, including: determining whether the heating suction temperature difference of the air conditioning system is greater than a set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, the opening degree of the first throttling device is controlled to be opened by a set value based on the current value; if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, the opening degree of the first throttling device is controlled to maintain the current value; if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, the opening degree of the first throttling device is controlled to be closed by a set value based on the current value.

[0018] In some embodiments, the acquisition unit is further configured to, in the case that the air conditioning system runs in the cooling mode after starting, acquire the outlet temperature of the outdoor heat exchanger, acquire the tube temperature of the first indoor heat exchanger, acquire the tube temperature of the second indoor heat exchanger, acquire the gas supplement temperature of the flash evaporator, acquire the first suction temperature of the compressor, and acquire the second suction temperature of the compressor at a set period; and the control unit is further configured to control the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the gas supplement temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor.

[0019] In some embodiments, the control unit, in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, controls the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device of the air conditioning system, including: controlling the rotation speed of the indoor and outdoor fans to be the respective set rotation speeds, the frequency of the compressor to be the set frequency, and the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device to be the respective set opening degrees; after a set time period, determining the average value of the tube temperature of the first indoor heat exchanger and the tube temperature of the second indoor heat exchanger as a first average value, determining the average value of the first average value and the outlet temperature of the outdoor heat exchanger as a second average value, determining the difference between the second average value and the temperature of the flash evaporator as the air conditioning system's air supplement temperature difference; adjusting the opening degree of the first throttling device according to the air conditioning system's air supplement temperature difference; after a set time period, determining the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger as the air conditioning system's first refrigeration suction temperature difference; and adjusting the opening degree of the second throttling device according to the air conditioning system's first refrigeration suction temperature difference; after a set time period, determining the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger as the air conditioning system's second refrigeration suction temperature difference; and adjusting the opening degree of the third throttling device according to the air conditioning system's second refrigeration suction temperature difference; after a set time period, determining whether the air conditioning system's air supplement temperature difference reaches the set air supplement target value, the air conditioning system's second refrigeration suction temperature difference reaches the set first refrigeration suction target value, and the air conditioning system's second refrigeration suction temperature difference reaches the set second refrigeration suction target value: if yes, maintaining the current operation; if no, returning to re-determine the air conditioning system's air supplement temperature difference.

[0020] In some embodiments, the control unit adjusts the opening degree of the first throttling device according to the air supplement temperature difference of the air conditioning system, including: determining whether the air supplement temperature difference of the air conditioning system is greater than a set air supplement target value; if it is determined that the air supplement temperature difference of the air conditioning system is greater than the set air supplement target value, then controlling the opening degree of the first throttling device to be greater than the current value by a set value; if it is determined that the air supplement temperature difference of the air conditioning system is equal to the set air supplement target value, then controlling the opening degree of the first throttling device to maintain the current value; if it is determined that the air supplement temperature difference of the air conditioning system is less than the set air supplement target value, then controlling the opening degree of the first throttling device to be less than the current value by a set value; and / or the control unit adjusts the opening degree of the second throttling device according to the first refrigeration suction temperature difference of the air conditioning system, including: determining whether the first refrigeration suction temperature difference of the air conditioning system is greater than a set first refrigeration suction target value; if it is determined that the first refrigeration suction temperature difference of the air conditioning system is greater than the set first refrigeration suction target value, then controlling the opening degree of the second throttling device to be greater than the current value by a set value; if it is determined that the first refrigeration suction temperature difference of the air conditioning system is equal to the set first refrigeration suction target value, then controlling the opening degree of the second throttling device to maintain the current value; if it is determined that the first refrigeration suction temperature difference of the air conditioning system is less than the set first refrigeration suction target value, then controlling the opening degree of the second throttling device to be less than the current value by a set value; and / or the control unit adjusts the opening degree of the third throttling device according to the second refrigeration suction temperature difference of the air conditioning system, including: determining whether the second refrigeration suction temperature difference of the air conditioning system is greater than a set second refrigeration suction target value; if it is determined that the second refrigeration suction temperature difference of the air conditioning system is greater than the set second refrigeration suction target value, then controlling the opening degree of the third throttling device to be greater than the current value by a set value; if it is determined that the second refrigeration suction temperature difference of the air conditioning system is equal to the set second refrigeration suction target value, then controlling the opening degree of the third throttling device to maintain the current value; if it is determined that the second refrigeration suction temperature difference of the air conditioning system is less than the set second refrigeration suction target value, then controlling the opening degree of the third throttling device to be less than the current value by a set value.

[0021] In another aspect, the present application provides an air conditioning system, which is matched with the above-mentioned device, including the above-mentioned control device of the air conditioning system.

[0022] In another aspect, the present application provides a storage medium, which is matched with the above-mentioned method, including a stored program, wherein when the program runs, the device where the storage medium is located executes the steps of the above-mentioned control method of the air conditioning system.

[0023] According to the method, the application further provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the control method of the air conditioning system.

[0024] Therefore, the application sets three throttling devices (such as A valve, B valve and C valve) for the three-cylinder air conditioning system with air injection and double-temperature indoor heat exchanger (i.e. the air conditioning system with three-cylinder compressor, double-temperature indoor heat exchanger and flash evaporator), the A valve is arranged in the pipeline between the flash evaporator and the indoor heat exchanger, the B valve is arranged in the pipeline between the double-temperature indoor heat exchanger and the flash evaporator, and the C valve is arranged in the pipeline of the indoor heat exchanger 2 in the double-temperature indoor heat exchanger (specifically, the C valve is arranged in the pipeline between the indoor heat exchanger 2 and the B valve in the double-temperature indoor heat exchanger); the control strategy of the valve opening degree of the throttling device is set as three control modes: the first mode is to set a three-way valve, a capillary and a check valve, the three-way valve is communicated with the outdoor heat exchanger, the A valve and the check valve, and the capillary and the check valve can bypass the pipeline of the A valve, the flash evaporator and the B valve; the second mode is to set a capillary, which is arranged in the pipeline between the flash evaporator and the compressor; and the third mode is to set a capillary, which is arranged in the pipeline between the double-temperature indoor heat exchanger and the B valve; in the refrigeration mode, the control is based on the air injection temperature T of the flash evaporator, the high-temperature and low-temperature suction superheat degree of the compressor and the discharge superheat degree of the compressor; in the heating mode, in the first control mode, the control is based on the suction superheat degree 1 of the compressor; and in the second control mode and the third control mode, the control is based on the discharge superheat degree and the suction superheat degree 1 of the compressor, so that the throttling control under different conditions can be realized; thereby, the air injection amount of the compressor is controlled by setting the three throttling devices and the auxiliary throttling device (specifically, the capillary is set in different modes), and the heating performance is improved.

[0025] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application.

[0026] The technical solutions of the application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Flowchart of an embodiment of the control method of the air conditioning system of the application;

[0028] Figure 2 Flowchart of an embodiment of the first process of controlling the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device in the heating mode in the method of the application;

[0029] Figure 3Flow chart of an embodiment of the method of the present application for adjusting the opening degree of the first throttling device according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger in the heating mode;

[0030] Figure 4 Flow chart of an embodiment of the second process of the method of the present application for controlling the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in the heating mode;

[0031] Figure 5 Flow chart of an embodiment of the method of the present application for adjusting the opening degree of the second throttling device according to the discharge temperature of the compressor in the heating mode;

[0032] Figure 6 Flow chart of an embodiment of the method of the present application for adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system in the heating mode;

[0033] Figure 7 Flow chart of an embodiment of the method of the present application for controlling the operation of the air conditioning system in the cooling process;

[0034] Figure 8 Flow chart of an embodiment of the method of the present application for controlling the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in the cooling process;

[0035] Figure 9 Flow chart of an embodiment of the method of the present application for adjusting the opening degree of the first throttling device according to the air supplement temperature difference of the air conditioning system in the cooling mode;

[0036] Figure 10 Flow chart of an embodiment of the method of the present application for adjusting the opening degree of the second throttling device according to the first cooling suction temperature difference of the air conditioning system in the cooling mode;

[0037] Figure 11 Flow chart of an embodiment of the method of the present application for adjusting the opening degree of the third throttling device according to the second cooling suction temperature difference of the air conditioning system in the cooling mode;

[0038] Figure 12 Structure diagram of an embodiment of the control device of the air conditioning system of the present application;

[0039] Figure 13 Structure diagram of a first embodiment of the air conditioning system, wherein (a) is a structure diagram of the air conditioning system in the heating mode, and (b) is a structure diagram of the air conditioning system in the cooling mode;

[0040] Figure 14 A schematic diagram of an opening degree control process of a valve of an air conditioning system as shown in Figure 13 A schematic diagram of an opening degree control process of a valve of an air conditioning system as shown in

[0041] Figure 15 A schematic diagram of a structure of a second embodiment of an air conditioning system, specifically a schematic diagram of a structure of the air conditioning system in a heating mode;

[0042] Figure 16 A schematic diagram of a structure of a third embodiment of an air conditioning system, specifically a schematic diagram of a structure of the air conditioning system in a heating mode;

[0043] Figure 17 A schematic diagram of an opening degree control process of a valve of an air conditioning system as shown in Figure 15 A schematic diagram of an opening degree control process of a valve of an air conditioning system as shown in Figure 16 A schematic diagram of an opening degree control process of a valve of an air conditioning system as shown in

[0044] In combination with the drawings, the following is a description of the drawings in the embodiments of the present application:

[0045] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0047] Considering that the air conditioning system (such as a three-cylinder air supplementing double-temperature air conditioning system) may have problems such as low heating capacity caused by unreasonable air supplementing amount during heating operation, such as the problem of low exhaust temperature caused by excessive air supplementing amount, thereby causing the problem of insufficient heating capacity. The control method of the three-cylinder heat pump air conditioning system provided by some schemes focuses on the selection of the throttling mechanism in the refrigeration operation, which may not be suitable for the heating operation, and may cause air supplementing with liquid, thereby causing low or insufficient heating capacity. Therefore, the scheme of the present application provides a control method of an air conditioning system, specifically a control method of a three-cylinder air supplementing double-temperature air conditioning system, which adopts a bypass throttling device + one-way valve scheme during heating operation to solve the problem of insufficient heating capacity of the three-cylinder air supplementing double-temperature air conditioning system.

[0048] According to the embodiments of the present application, a control method of an air conditioning system is provided, such as Figure 1The diagram shows a flow chart of an embodiment of the method of the present invention. The air conditioning system is a three-cylinder, dual-temperature air conditioning system with air supply. This system includes a compressor, an outdoor heat exchanger, two indoor heat exchangers, a flash evaporator, a first throttling device, a second throttling device, a third throttling device, and an auxiliary throttling device. The two indoor heat exchangers include a first indoor heat exchanger and a second indoor heat exchanger. The first throttling device is located on the pipeline between the flash evaporator and the outdoor heat exchanger. The second throttling device is located on the pipeline between the two indoor heat exchangers and the flash evaporator. The third throttling device is located on the pipeline connecting the second indoor heat exchanger and the second throttling device (specifically, the third throttling device is located on the pipeline between the second indoor heat exchanger and the second throttling device, but not on the pipeline between the first indoor heat exchanger and the second throttling device). The auxiliary throttling device is located in the air supply pipeline of the compressor and is used to assist in adjusting the air supply volume of the compressor. The compressor is a three-cylinder compressor. The first indoor heat exchanger is as follows... Figure 13 (a) Figure 15 and Figure 16 Condenser 1 in Figure 13 Evaporator 1 in (b), the second indoor heat exchanger as shown Figure 13 (a) Figure 15 and Figure 16 Condenser 2 in the middle Figure 13 Evaporator 2 in (b), outdoor heat exchanger such as Figure 13 (a) Figure 15 and Figure 16 Evaporator in Figure 13 The condenser in (b) has a first throttling device such as valve A, a second throttling device such as valve B, a third throttling device such as valve C, and an auxiliary throttling device such as... Figure 13 The capillary tube and check valve in the middle Figure 15 capillaries in Figure 16 Capillaries, etc. In the embodiments of the present invention, such as... Figure 1 As shown, the control method of the air conditioning system includes steps S110 to S120.

[0049] In step S110, when the air conditioning system is turned on and running in heating mode, the outdoor ambient temperature of the air conditioning system or the discharge temperature of the compressor (e.g., the discharge temperature of the compressor, T_discharge) is obtained according to a set period, the first suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor, T_suction1) is obtained, and the pipe temperature of the outdoor heat exchanger (e.g., the pipe temperature of the outdoor heat exchanger, T_outerpipe) is obtained; wherein, the set period is such as time t2, and the range of time t2 is 60 seconds to 120 seconds.

[0050] In step S120, in heating mode, based on the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled to adjust the gas supply of the compressor so that the heating capacity of the air conditioning system is within the set heating capacity range.

[0051] The present invention employs an auxiliary throttling device in the three-cylinder air-fuel-injection dual-temperature air conditioning system during heating operation. For example, a bypass throttling device (such as a capillary tube) is adopted and selectively combined with a one-way valve. This solves the problem of low heating capacity caused by unreasonable air injection, improves the heating effect of the system, and thus solves the problem of insufficient heating capacity of the three-cylinder air-fuel-injection dual-temperature air conditioning system.

[0052] In some embodiments, the auxiliary throttling device includes: a first capillary tube, a one-way valve, and a three-way valve, wherein the first capillary tube is as follows: Figure 13 The capillary tube shown; a bypass pipeline is provided on the pipeline where the first throttling device, the flash evaporator and the second throttling device are located; the first capillary tube and the one-way valve are connected in series on the bypass pipeline; the first valve port of the three-way valve is connected to the outdoor heat exchanger, the second valve port of the three-way valve is connected to the outlet of the one-way valve, the first capillary tube is connected to the inlet of the one-way valve, and the third valve port of the three-way valve is connected to the first throttling device.

[0053] Figure 13 This is a structural schematic diagram of a first embodiment of an air conditioning system, wherein (a) is a structural schematic diagram of the air conditioning system in heating mode, and (b) is a structural schematic diagram of the air conditioning system in cooling mode. Figure 13The air conditioning system shown includes: a compressor (specifically a three-cylinder compressor), a four-way valve assembly 1, a four-way valve assembly 2, an outdoor heat exchanger (such as an evaporator in heating mode), a three-way valve, valve A, a flash evaporator, valve B, valve C, an indoor heat exchanger 1 (such as a condenser 1 in heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode), a check valve, and a capillary tube. The compressor's discharge port is connected to the third valve port of four-way valve assembly 1 and the first valve port of four-way valve assembly 2, respectively. The second valve port of four-way valve assembly 1 is connected to the second valve port of four-way valve assembly 2. The first valve port of four-way valve assembly 1 is connected to the second suction port of the compressor, and the third valve port of four-way valve assembly 2 is connected to the first suction port of the compressor. The fourth valve port of four-way valve assembly 1, after passing through indoor heat exchanger 2 and valve C, splits into two paths: one path connects to the first port of the flash evaporator via valve B, and the other path connects to the second valve port of the three-way valve via the capillary tube and the check valve. The first port of the three-way valve connects to the second port of the four-way valve component 1 after passing through the outdoor heat exchanger. The third port of the three-way valve connects to the second port of the flash evaporator after passing through valve A, and the third port of the flash evaporator connects to the third suction port of the compressor. The fourth port of the four-way valve component 2 connects to the common end of valves B and C after passing through the indoor heat exchanger 1. The inlet of the one-way valve is the end connected to the capillary tube, meaning that the permissible flow direction of the one-way valve is from the capillary tube to the second port of the three-way valve.

[0054] like Figure 13 As shown, in the present invention, the outdoor unit of the air conditioning system uses a three-cylinder compressor and a flash evaporator, while the indoor unit uses a dual-temperature evaporator and is equipped with multiple throttling devices. In addition to the capillary tube connected to the one-way valve, the air conditioning system in this invention also employs three throttling devices (valve A, valve B, and valve C), preferably electronic expansion valves, but programmable thermostatic expansion valves can also be used. The outlet of the outdoor unit heat exchanger has a three-way structure, with one channel connected to the one-way valve and capillary tube, and the other channel connected to throttling device valve A. During heating, valve B is closed, and the refrigerant exits from the indoor heat exchanger, passes through the capillary tube and the one-way valve, and enters the outdoor heat exchanger and flash evaporator respectively, thereby adjusting the refrigerant supply and improving heating performance. During cooling, the refrigerant enters valve A from the outdoor heat exchanger and then enters the flash evaporator.

[0055] In step S120, in heating mode, based on the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled, including: a first process of controlling the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in heating mode.

[0056] The following is combined Figure 2The schematic diagram shows an embodiment of the first process of controlling the opening degree of the first throttling device, the second throttling device, and the third throttling device in the heating mode of the method of the present invention. It further illustrates the specific process of controlling the opening degree of the first throttling device, the second throttling device, and the third throttling device in the heating mode in step S120, including steps S210 to S230.

[0057] Step S210: In heating mode, determine whether the outdoor ambient temperature of the air conditioning system is less than or equal to the set outdoor ambient low temperature threshold; wherein, the set outdoor ambient low temperature threshold is, for example, the set T outer ring low temperature, and the low temperature range of the T outer ring is -5℃ to 2℃.

[0058] Step S220: In heating mode, if the outdoor ambient temperature of the air conditioning system is determined to be less than or equal to a set outdoor ambient low temperature threshold, then the rotation speed of the indoor and outdoor fans is controlled to their respective set rotation speeds, the frequency of the compressor is controlled to a set frequency, the opening degree of the first throttling device is controlled to a set first initial opening degree, the opening degree of the second throttling device is 0, and the opening degree of the third throttling device is controlled to a set maximum opening degree; after a set time period, the opening degree of the first throttling device is adjusted according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger; wherein, the set time period is such as time t1, and the range of time t1 is 3 to 10 minutes. The set first initial opening degree is the initial opening degree 1 of valve A. The range of the initial opening degree 1 of valve A is 50B to 100B.

[0059] Step S230: In heating mode, if it is determined that the outdoor ambient temperature of the air conditioning system is greater than the set outdoor ambient low temperature threshold, then the rotation speed of the indoor and outdoor fans is controlled to their respective set rotation speeds, the frequency of the compressor is controlled to a set frequency, the opening degree of the first throttling device is controlled to a set second initial opening degree, the opening degree of the second throttling device is 0, and the opening degree of the third throttling device is controlled to a set maximum opening degree. The set second initial opening degree is the initial opening degree 2 of valve A. The range of the initial opening degree 2 of valve A is 150B to 300B.

[0060] Figure 14 For example Figure 13 The diagram shows the valve opening control process of an air conditioning system. Figure 14As shown, in the solution of the present invention, the air conditioning system uses the replenishment gas temperature, intake superheat, exhaust superheat, etc. to control the throttling device. In the present invention, the air conditioning system includes multiple temperature sensors. The indoor unit, in addition to an ambient temperature sensor to detect the indoor ambient temperature Tinner ring, also has two evaporator pipe temperature sensors to detect the pipe temperatures of the two indoor heat exchangers, such as Tinner pipe 1 and Tinner pipe 2 in cooling mode. In contrast, the air conditioning system in related solutions only has one inner pipe temperature sensor. The outdoor unit, in addition to an ambient temperature sensor to detect the outdoor ambient temperature Touter ring, an exhaust temperature sensor to detect the compressor's exhaust temperature Texhaust, and an outdoor heat exchanger pipe temperature sensor (such as a condenser pipe temperature sensor in cooling mode) to detect the outdoor heat exchanger pipe temperature Touter pipe, is also equipped with a gas injection temperature sensor located at the flash evaporator outlet (the third port of the flash evaporator, i.e., the port connecting the flash evaporator and the compressor) to detect the flash evaporator's gas injection temperature Tgas injection, a condenser outlet temperature sensor to detect the outdoor heat exchanger's outlet temperature Tcold outlet, and two suction temperature sensors to detect the compressor's suction temperature Tsuction 1 and Tsuction 2. The temperatures mentioned here are all actual values ​​detected by the temperature sensor. The initial operating frequency of the compressor upon startup needs to be determined based on the temperature difference between the inner loop (T) and the user-set temperature, and the outer loop (T). This can be achieved using the control logic of an air conditioning system from a relevant solution, which will not be detailed in this invention. Figure 14 As shown, the control strategy of the throttling device during heating is based on the compressor's suction superheat 1. Figure 14 As shown, Figure 13 The control strategy of the throttling device in the air conditioning system shown includes:

[0061] Step 21: After the air conditioning system is turned on, determine the operating mode. If it is in heating mode, collect the indoor and outdoor ambient temperature, set temperature, and set the fan speed in heating mode, and then proceed to step 22.

[0062] Step 22: Determine if the outdoor ambient temperature T_outer_ring is less than or equal to the set T_outer_ring low temperature. If not, proceed to step 23; if so, proceed to step 24. The set T_outer_ring low temperature is the low temperature range of the T_outer_ring, which is -5℃ to 2℃.

[0063] Step 23: If the outdoor ambient temperature T_outer ring does not meet the set T_outer ring low temperature, then the program will run according to the built-in indoor and outdoor fan speeds, compressor operating frequency, and initial valve openings (initial opening of valve A is 2, valve B is closed, and valve C is at its maximum opening) until shutdown or a change in the indoor and outdoor ambient temperature setting parameters. If the indoor and outdoor ambient temperature setting parameters change, then return to step 21. The range of the initial opening of valve A is 150B to 300B.

[0064] Step 24, if Touter ring meets Touter ring low temperature set, then the program is built into the inner and outer fan speed, compressor operating frequency and the initial opening of the valve (the initial opening of the valve A is 1, the valve B is closed, and the valve C is the maximum opening), runs for t1 time, and then step 25 is performed. The initial opening of the valve A is 1 in the range of 50B to 100B.

[0065] In the scheme of the application, a capillary and a one-way valve are added, which function to control the air supplement amount of the air conditioning system during heating operation, prevent the air supplement amount from being too large, and reduce the heating capacity due to air supplement with liquid. If there is no capillary and one-way valve, the refrigerant will enter the flash evaporator through the B valve, and then the liquid refrigerant enters the evaporator through the A valve, and the gaseous refrigerant enters the flash evaporator, which cannot well control the air supplement amount. The scheme of the application proposes a system for improving the heating capacity of a three-cylinder air supplement dual-temperature air conditioning system and a control scheme thereof. The air conditioning system includes but is not limited to wall-mounted machines, cabinet machines, multi-connected machines, and the like. In the related scheme, the three-cylinder air supplement dual-temperature air conditioning system, the refrigerant from the indoor heat exchanger enters the flash evaporator through the B valve, and then part of it enters the third suction port of the compressor, and the other part enters the outdoor heat exchanger through the A valve. Since the B valve may have noise at a small opening, the opening of the B valve can only take a large value. In this case, the air supplement amount entering the flash evaporator will be too large, resulting in air supplement with liquid, low exhaust temperature, poor heating capacity, and even unstable system operation.

[0066] In the scheme of the application, a capillary and a one-way valve are added, which function to control the air supplement amount of the air conditioning system during heating operation, prevent the air supplement amount from being too large, and reduce the heating capacity due to air supplement with liquid. If there is no capillary and one-way valve, the refrigerant will enter the flash evaporator through the B valve, and then the liquid refrigerant enters the evaporator through the A valve, and the gaseous refrigerant enters the flash evaporator, which cannot well control the air supplement amount. The scheme of the application proposes a system for improving the heating capacity of a three-cylinder air supplement dual-temperature air conditioning system and a control scheme thereof. The air conditioning system includes but is not limited to wall-mounted machines, cabinet machines, multi-connected machines, and the like. In the related scheme, the three-cylinder air supplement dual-temperature air conditioning system, the refrigerant from the indoor heat exchanger enters the flash evaporator through the B valve, and then part of it enters the third suction port of the compressor, and the other part enters the outdoor heat exchanger through the A valve. Since the B valve may have noise at a small opening, the opening of the B valve can only take a large value. In this case, the air supplement amount entering the flash evaporator will be too large, resulting in air supplement with liquid, low exhaust temperature, poor heating capacity, and even unstable system operation. Figure 13 (a) figure.

[0067] In the present invention, based on an auxiliary throttling device consisting of a first capillary tube and a one-way valve, in heating mode, the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled according to the outdoor ambient temperature of the air conditioning system, the first suction temperature of the compressor, and the pipe temperature of the outdoor heat exchanger. This allows for adjustment of the gas supply and improves heating performance. However, if the gas supply is too large during heating, it may lead to liquid carryover, thereby reducing heating capacity. Therefore, the present invention employs a one-way valve + capillary tube structure, which becomes the main throttling device during heating, allowing for smaller refrigerant flow control. Combined with the control of the first throttling device, the downstream gas supply is also smaller. Without this one-way valve + capillary tube structure, the second throttling device becomes the main throttling device, resulting in significant noise when controlling a small flow rate.

[0068] In some embodiments, the specific process of adjusting the opening degree of the first throttling device according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger in step S220 during heating mode is described in the following exemplary description.

[0069] The following is combined with Figure 3 The schematic diagram shows an embodiment of the method of the present invention, which adjusts the opening of the first throttling device according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger in the heating mode. It further illustrates the specific process of adjusting the opening of the first throttling device according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger in step S220, including steps S310 to S350.

[0070] Step S310: In heating mode, determine the difference between the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, and record it as the heating suction temperature difference of the air conditioning system (e.g., ΔT suction 1).

[0071] Step S320: In heating mode, determine whether the heating and suction temperature difference of the air conditioning system is greater than the set heating suction target value; wherein, the set heating suction target value is, for example, the target value of ΔT suction 1. The target value of ΔT suction 1 ranges from 3℃ to 5℃.

[0072] Step S330: In heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is greater than the set heating and suction target value, the opening of the first throttling device is increased by a set value based on the current value, and then it is re-determined whether the heating and suction temperature difference of the air conditioning system is greater than the set heating and suction target value.

[0073] Step S340: In heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is equal to the set heating and suction target value, then the opening of the first throttling device is controlled to maintain the current value, and then the rotation speed of the indoor and outdoor fans is controlled to their respective set rotation speed, the frequency of the compressor is controlled to the set frequency, the opening of the first throttling device is controlled to the current value, the opening of the second throttling device is controlled to 0, and the opening of the third throttling device is controlled to the set maximum opening to continue operation.

[0074] Step S350: In heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is less than the set heating and suction target value, the opening of the first throttling device is controlled to be reduced by a set value based on the current value, and then it is re-determined whether the heating and suction temperature difference of the air conditioning system is greater than the set heating and suction target value.

[0075] Specifically, such as Figure 14 As shown, Figure 13 The control strategy of the throttling device in the air conditioning system shown also includes:

[0076] Step 25: After running for time t1, calculate ΔTsuction1 = Tsuction1 - Touter pipe. If ΔTsuction1 is greater than the target value, increase the opening of valve A; if ΔTsuction1 is less than the target value, decrease the opening of valve A. Then proceed to step 26. Tsuction1 is the suction temperature of the compressor's first suction port, and Touter pipe is the pipe temperature of the outdoor heat exchanger. The opening range of valves A, B, and C is 0B to 500B, and the opening range is adjusted by 10B to 20B each time.

[0077] Step 26: After running for time t3, determine whether ΔT_inhalation1 has reached the target value. If the target value has not been reached, continue adjusting the opening of valve A by ΔT_inhalation1. If the target value has been reached, continue running at this opening frequency until shutdown or if the indoor and outdoor ambient temperature settings change. If the indoor and outdoor ambient temperature settings change, return to step 21.

[0078] In the present invention, based on an auxiliary throttling device consisting of a first capillary tube and a one-way valve, in heating mode, the opening of the first throttling device is adjusted according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, thereby adjusting the amount of supplementary gas and improving heating performance. Specifically, the first throttling device controls the amount of supplementary gas entering the flash evaporator.

[0079] In some embodiments, the auxiliary throttling device further includes: a second capillary tube or a fourth throttling device; or, the auxiliary throttling device further includes: a third capillary tube or a fifth throttling device, wherein the second capillary tube is as follows: Figure 15 The capillary in the middle, the third capillary, such as Figure 16a second capillary or a fifth throttling device arranged in the pipeline between the double- chamber internal heat exchanger and the second throttling device.

[0080] Figure 15 A structural schematic diagram of a second embodiment of an air conditioning system, specifically a structural schematic diagram of the air conditioning system in a heating mode. Figure 15 A second system schematic diagram for improving heating performance, a capillary (or electronic expansion valve) is connected between the flash evaporator outlet and the compressor inlet to control the amount of air supplement. Figure 15 An air conditioning system as shown, comprising: a compressor (specifically a three-cylinder compressor), a four-way valve component 1, a four-way valve component 2, an outdoor heat exchanger (such as an evaporator in a heating mode), an A valve, a flash evaporator, a B valve, a C valve, an indoor heat exchanger 1 (such as a condenser 1 in a heating mode), an indoor heat exchanger 2 (such as a condenser 2 in a heating mode), and a capillary. The exhaust port of the compressor is connected to the third valve port of the four-way valve component 1 and the first valve port of the four-way valve component 2, respectively; the second valve port of the four-way valve component 1 is connected to the second valve port of the four-way valve component 2, the first valve port of the four-way valve component 1 is connected to the second suction port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first suction port of the compressor. The fourth valve port of the four-way valve component 1 is connected to the first port of the flash evaporator after passing through the indoor heat exchanger 2 and the C valve, and then through the B valve. The second port of the flash evaporator is connected to the second valve port of the four-way valve component 1 after passing through the A valve and the indoor heat exchanger. The third port of the flash evaporator is connected to the third suction port of the compressor after passing through the capillary. The fourth valve port of the four-way valve component 2 is connected to the common end of the B valve and the C valve after passing through the indoor heat exchanger 1.

[0081] Figure 16 A structural schematic diagram of a third embodiment of an air conditioning system, specifically a structural schematic diagram of the air conditioning system in a heating mode. Figure 16 A third system schematic diagram for improving heating performance, a capillary (or electronic expansion valve) is connected in series before the B valve. As shown in Figure 16The air conditioning system shown includes: a compressor (specifically a three-cylinder compressor), a four-way valve component 1, a four-way valve component 2, an outdoor heat exchanger (such as an evaporator in a heating mode), an A valve, a flash evaporator, a B valve, a C valve, an indoor heat exchanger 1 (such as a condenser 1 in a heating mode), an indoor heat exchanger 2 (such as a condenser 2 in a heating mode), and a capillary tube. The exhaust port of the compressor is connected to the third valve port of the four-way valve component 1 and the first valve port of the four-way valve component 2, respectively; the second valve port of the four-way valve component 1 is connected to the second valve port of the four-way valve component 2, the first valve port of the four-way valve component 1 is connected to the second suction port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first suction port of the compressor. The fourth valve port of the four-way valve component 1 is connected to the first port of the flash evaporator through the indoor heat exchanger 2, the C valve, the capillary tube, and the B valve. The second port of the flash evaporator is connected to the second valve port of the four-way valve component 1 through the A valve and the indoor heat exchanger. The third port of the flash evaporator is connected to the third suction port of the compressor. The fourth valve port of the four-way valve component 2 is connected to the common end of the B valve and the C valve through the indoor heat exchanger 1.

[0082] wherein, Figure 15 and Figure 16 The main purpose of the above is to control the amount of supplementary air entering the flash evaporator, prevent the amount of supplementary air from being too large, and reduce the heating capacity.

[0083] In step S120, in the heating mode, based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled. The second process of controlling the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in the heating mode is also included.

[0084] The following will be further described with reference to the embodiment flowchart of the second process of controlling the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in the heating mode in the method of the application shown in Figure 4 The following will be further described with reference to the embodiment flowchart of the second process of controlling the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device in the heating mode in the method of the application shown in

[0085] Step S410: In heating mode, control the rotation speed of the indoor and outdoor fans to their respective set rotation speeds, the frequency of the compressor to a set frequency, the opening degree of the first throttling device and the second throttling device to their respective set opening degrees, and the opening degree of the third throttling device to a set maximum opening degree. Here, the set rotation speed, set frequency, and set opening degree are all built-in settings in the program. Figure 17 for Figure 15 and Figure 16 The diagram shows the valve opening control process of an air conditioning system in heating mode. Figure 15 and Figure 16 In the example shown, the valve opening control mode remains unchanged in cooling mode, but the operating parameters will differ due to the different positions of the capillary tubes connected in series. For example... Figure 17 As shown, the valve opening control strategy in heating mode is based on the compressor's discharge superheat and suction superheat. Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode is shown as follows: Step 31: After starting the system, determine the operating mode. If it is heating mode, collect the indoor and outdoor ambient temperature, set temperature, set fan speed, and internal and external fan speeds, compressor operating frequency and initial valve opening (valve C always maintains the maximum opening in heating mode) according to the built-in program, run for t1 time, and then execute step 32.

[0086] Step S420: In heating mode, after setting a duration, adjust the opening of the second throttling device according to the compressor's exhaust temperature; wherein, the set duration is, for example, time t1. Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode shown includes: step 32, collecting temperature sensor data at a cycle t2, adjusting the opening of valve B according to the exhaust temperature T of the compressor, and then executing step 33.

[0087] In some embodiments, the specific process of adjusting the opening degree of the second throttling device according to the exhaust temperature of the compressor in step S420 during heating mode is described in the following exemplary description.

[0088] The following is combined Figure 5 The schematic diagram shows an embodiment of the method of the present invention in which the opening degree of the second throttling device is adjusted according to the exhaust temperature of the compressor in the heating mode. The specific process of adjusting the opening degree of the second throttling device according to the exhaust temperature of the compressor in the heating mode in step S420 is further explained, including steps S510 to S540.

[0089] Step S510: In heating mode, determine the relationship between the compressor's exhaust temperature and the set first exhaust temperature threshold, the set second exhaust temperature threshold, and the set third exhaust temperature threshold; wherein the set first exhaust temperature threshold is less than the set second exhaust temperature threshold, the set first exhaust temperature threshold is greater than the set third exhaust temperature threshold, the set exhaust temperature target value is the set third exhaust temperature threshold, the set first exhaust temperature threshold is such as the T_exhaust_B1 target value, the set second exhaust temperature threshold is such as the T_exhaust_B2 target value, and the set third exhaust temperature threshold is such as the T_exhaust_B3 target value. Specifically, the T_exhaust target value is the T_exhaust_B3 target value.

[0090] Step S520: In heating mode, if it is determined that the exhaust temperature of the compressor is greater than or equal to the set first exhaust temperature threshold and less than the set second exhaust temperature threshold, then the opening of the second throttling device is increased by the set first opening value based on the current value; wherein, the set first opening value is such as K_exhaust_B1.

[0091] Step S530: In heating mode, if it is determined that the exhaust temperature of the compressor is greater than or equal to the set second exhaust temperature threshold, the opening of the second throttling device is increased by a set second opening value based on the current value, and the set second opening value is greater than the set first opening value; wherein, the set second opening value is such as K exhaust_B2.

[0092] Step S540: In heating mode, if it is determined that the exhaust temperature of the compressor is less than the set third exhaust temperature threshold, the current value of the opening of the second throttling device is restored to the set opening of the second throttling device.

[0093] like Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode, as shown, further includes: in step 32, adjusting the opening of valve B according to the compressor's exhaust temperature T, specifically including:

[0094] ① When the compressor's discharge temperature T_discharge is greater than or equal to T_discharge_B1, valve B increases its opening by K_discharge_B1 according to the current opening.

[0095] ② When the compressor's discharge temperature T_discharge is greater than or equal to T_discharge_B2, valve B increases its opening by K_discharge_B2 according to the current opening.

[0096] ③ When the compressor's discharge temperature T_discharge < T_discharge_B3, valve B resumes its reference opening.

[0097] Wherein, the range of T exhaust gas _ B1 target value is (88℃-92℃), the range of K exhaust gas _ B1 is (4B-6B); the range of T exhaust gas _ B2 target value is (93℃-97℃), the range of K exhaust gas _ B2 is (8B-10B); the range of T exhaust gas _ B3 target value is (75℃-85℃).

[0098] In the scheme of the application, based on the auxiliary throttling device composed of the second capillary or the third capillary, in the heating mode, the opening degree of the second throttling device is adjusted according to the exhaust temperature of the compressor, so that the air charge amount can be adjusted and the heating performance can be improved. Wherein, the second capillary directly controls the air charge amount, and the third capillary controls the refrigerant flow entering the second throttling device, both of which can achieve the purpose of reducing the air charge amount entering the flash evaporator.

[0099] Step S430, in the heating mode, after the set time period, determine the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, denoted as the heating suction temperature difference of the air conditioning system (such as ΔT suction 1 in the heating mode); and adjust the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system; wherein, the set time period is, for example, t3 time, and the time t3 ranges from 120 to 180 seconds. As shown in Figure 17 As shown in Figure 15 And Figure 16 The opening degree control process of the valve of the air conditioning system in the heating mode as shown in

[0100] In some embodiments, in the heating mode, the specific process of adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system in step S430 is described in the following exemplary description.

[0101] The following will be further described in combination with the embodiment flow diagram of adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system in the heating mode in the method of the application as shown in Figure 6 The following will be further described in combination with the embodiment flow diagram of adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system in the heating mode in the method of the application as shown in

[0102] Step S610, in the heating mode, determine whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value; wherein, the set heating suction target value is, for example, the target value of ΔT suction 1. The target value of ΔT suction 1 ranges from 3℃ to 5℃.

[0103] Step S620: In heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is greater than the set heating suction target value, then the opening of the first throttling device is increased by a set value based on the current value. Then it is determined whether the exhaust temperature of the compressor reaches the set exhaust temperature target value and the heating and suction temperature difference of the air conditioning system reaches the set heating suction target value.

[0104] Step S630: In heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is equal to the set heating and suction target value, then the opening of the first throttling device is controlled to maintain the current value, and then it is determined whether the exhaust temperature of the compressor reaches the set exhaust temperature target value and the heating and suction temperature difference of the air conditioning system reaches the set heating and suction target value.

[0105] Step S640: In heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is less than the set heating suction target value, then the opening of the first throttling device is controlled to be reduced by a set value based on the current value. Then it is determined whether the exhaust temperature of the compressor reaches the set exhaust temperature target value and the heating and suction temperature difference of the air conditioning system reaches the set heating suction target value.

[0106] like Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode, as shown, further includes: In step 33, after adjusting the opening of valve B according to the compressor's exhaust temperature T_exhaust and running for time t3, calculating ΔT_suction1 = T_suction1 - T_outer_pipe; if ΔT_suction1 is greater than the target value, increasing the opening of valve A; if ΔT_suction1 is less than the target value, decreasing the opening of valve A; then proceeding to step 34. The opening range of valves A, B, and C is all 0B to 500B, and each adjustment range is 10B to 20B.

[0107] In the present invention, based on an auxiliary throttling device composed of a second capillary or a third capillary, in heating mode, the opening of the first throttling device can be adjusted according to the heating and absorption temperature difference of the air conditioning system to adjust the gas supply and improve the heating performance.

[0108] Step S440: In heating mode, after a set time period, determine whether the compressor's exhaust temperature reaches the set exhaust temperature target value and the heating-suction temperature difference of the air conditioning system reaches the set heating-suction target value. If satisfied, maintain the current operation, that is, control the speed of the indoor and outdoor fans to their respective set speeds, the compressor frequency to the set frequency, the opening degree of the first throttling device to the current value, the opening degree of the second throttling device to the current value, and the opening degree of the third throttling device to the set maximum opening degree to continue operation. If not satisfied, return to redetermine the heating-suction temperature difference of the air conditioning system and readjust the opening degree of the first throttling device according to the heating-suction temperature difference of the air conditioning system. Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode, as shown, further includes: Step 34, after running for time t3, determining whether T_exhaust and ΔT_intake 1 have reached the target values: if the target values ​​have not been reached, continue adjusting the opening of the corresponding throttling device according to T_exhaust and ΔT_intake 1; if the target values ​​have been reached, continue operating at this frequency until shutdown or a change in the indoor / outdoor ambient temperature setting parameters. Specifically, when the indoor / outdoor ambient temperature setting parameters change, continue adjusting the opening of the corresponding throttling device according to T_exhaust and ΔT_intake 1.

[0109] In this invention, based on an auxiliary throttling device composed of a second or third capillary tube, in heating mode, the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled according to the compressor's exhaust temperature, the compressor's first suction temperature, and the pipe temperature of the outdoor heat exchanger. This allows for adjustment of the gas supply and improvement of heating performance. Suitable exhaust temperature and suction superheat are beneficial for the system to achieve better performance. During heating, the second throttling device is the primary throttling device to regulate the exhaust temperature, while the first throttling device is used to control the suction superheat. Since the indoor heat exchanger does not require dual-temperature operation during heating, the third throttling device remains open to its maximum during heating.

[0110] In some embodiments, the control method for the air conditioning system described in the present invention further includes: a process of controlling the operation of the air conditioning system during the cooling process.

[0111] The following is combined Figure 7 The diagram shows a flowchart of an embodiment of the method of the present invention for controlling the operation of the air conditioning system during the refrigeration process. It further illustrates the specific process of controlling the operation of the air conditioning system during the refrigeration process, including steps S710 to S720.

[0112] At step S710, in the case that the air conditioning system is running in the refrigeration mode after starting, the outlet temperature of the outdoor heat exchanger (such as Tcoolout), the tube temperature of the first indoor heat exchanger (such as Tintube1), the tube temperature of the second indoor heat exchanger (such as Tintube2), the temperature of the flash evaporator (such as Tsupplemental air), the first suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor Tintake1), and the second suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor Tintake2) are obtained at a set period.

[0113] At step S720, in the refrigeration mode, the speeds of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor to adjust the supplemental air amount of the compressor, so that the refrigeration capacity of the air conditioning system is in an optimal state.

[0114] The control of the frequency of the compressor of the air conditioning system in the scheme of the present application is similar to the control scheme of the air conditioning system in the related scheme, which is mainly determined by the indoor and outdoor environment temperature, the set temperature, and the air damper, and the temperature difference between the indoor environment temperature and the set temperature, and is not described in detail. Different from the control scheme of the air conditioning system in the related scheme, the throttling device of the air conditioning system in the scheme of the present application is controlled by using the supplemental air temperature difference, the multiple suction superheat degrees, and the exhaust superheat degree, so as to ensure the energy-saving and stable operation of the system.

[0115] In some embodiments, in the refrigeration mode, the speeds of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, and the specific process is described in the following exemplary description.

[0116] The following describes an embodiment of the method of the present application with reference to the accompanying drawings. Figure 8 The following describes an embodiment of the method of the present application with reference to the accompanying drawings. The following describes an embodiment of the method of the present application with reference to the accompanying drawings.

[0117] Step S810, in the refrigeration mode, the rotation speed of the indoor and outdoor fans is controlled to be the respective set rotation speed, the frequency of the compressor is controlled to be the set frequency, and the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device are controlled to be the respective set opening degrees. Figure 14 Figure 13 Figure 15 Figure 16 The control strategy of the throttling device of the air conditioning system in the refrigeration mode shown in Figure 14 Figure 13 Figure 15 Figure 16 The control strategy of the throttling device of the air conditioning system in the refrigeration mode shown in

[0118] Step S820, in the refrigeration mode, after the set time length, the average value of the tube temperature of the first indoor heat exchanger and the tube temperature of the second indoor heat exchanger is determined as a first average value, the average value of the first average value and the outlet temperature of the outdoor heat exchanger is determined as a second average value (such as the intermediate temperature T), and the difference between the second average value and the flash evaporator gas supplement temperature is determined as the gas supplement temperature difference (such as ΔTgas supplement) of the air conditioning system. Figure 14 Figure 13 Figure 15 Figure 16 The control strategy of the throttling device of the air conditioning system in the refrigeration mode shown in

[0119] In step 12, the intermediate temperature T is equal to [Tcooling out + (Tint tube 1 + Tint tube 2) / 2] / 2, where Tcooling out is the outlet temperature of the outdoor heat exchanger, Tint tube 1 is the tube temperature of the indoor heat exchanger 1, and Tint tube 2 is the tube temperature of the indoor heat exchanger 2. In step 12, ΔTgas supplement = Tintermediate temperature - Tgas supplement; where Tgas supplement is the temperature of the third port of the flash evaporator, i.e. the port of the flash evaporator connected to the compressor.

[0120] ​​​​​​​​​Step S830, in the cooling mode, adjusting the opening of the first throttling device according to the air supplement temperature difference of the air conditioning system. Figure 14 As shown in Figure 13 , Figure 15 and Figure 16 , the control strategy of the throttling device in the air conditioning system during cooling, further comprises: step 13, adjusting the opening of the A valve according to the air supplement temperature difference, running for t3 time, and then performing step 14.

[0121] In some embodiments, the specific process of adjusting the opening of the first throttling device according to the air supplement temperature difference of the air conditioning system in the cooling mode in step S830 is shown in the following exemplary description.

[0122] The following is an embodiment flowchart of adjusting the opening of the first throttling device according to the air supplement temperature difference of the air conditioning system in the cooling mode in the method of the present application shown in Figure 9 , which further illustrates the specific process of adjusting the opening of the first throttling device according to the air supplement temperature difference of the air conditioning system in the cooling mode in step S830, comprising steps S910 to S940.

[0123] Step S910, in the cooling mode, determining whether the air supplement temperature difference of the air conditioning system is greater than the set air supplement target value; wherein the set air supplement target value is, for example, the target value of ΔTair supplement. The target value of ΔTair supplement ranges from 2°C to 3°C.

[0124] Step S920, in the cooling mode, if it is determined that the air supplement temperature difference of the air conditioning system is greater than the set air supplement target value, then the opening of the first throttling device is controlled to be opened by a set value based on the current value.

[0125] Step S930, in the cooling mode, if it is determined that the air supplement temperature difference of the air conditioning system is equal to the set air supplement target value, then the opening of the first throttling device is controlled to maintain the current value.

[0126] Step S940, in the cooling mode, if it is determined that the air supplement temperature difference of the air conditioning system is less than the set air supplement target value, then the opening of the first throttling device is controlled to be closed by a set value based on the current value.

[0127] As shown in Figure 14 , as shown in Figure 13 , Figure 15 and Figure 16 , the control strategy of the throttling device in the air conditioning system during cooling, further comprises: in step 13, when ΔTair supplement is greater than the target value, the opening of the A valve is increased, and when ΔTair supplement is less than the target value, the opening of the A valve is decreased. The target value of ΔTair supplement ranges from 2°C to 3°C.

[0128] Step S840, in the refrigeration mode, after setting the time period, determine the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger, denoted as the first refrigeration suction temperature difference (such as ΔT suction 1 in the refrigeration mode) of the air conditioning system; and adjust the opening degree of the second throttling device according to the first refrigeration suction temperature difference of the air conditioning system. As shown in Figure 14 , Figure 13 , Figure 15 , Figure 16 The control strategy of the throttling device of the air conditioning system shown in

[0129] In the scheme of the present application, in the refrigeration mode, the opening degree of the first throttling device is adjusted according to the charge temperature difference of the air conditioning system, which can ensure that the air conditioning system operates stably and saves energy. Wherein, if the opening degree of the first throttling device is too large, it may cause liquid carrying, low refrigeration capacity and large fluctuation; if the opening degree is too small, the refrigerant flow is small, which also leads to low refrigeration capacity; through the control method of the scheme of the present application, the first throttling device can be adjusted to a better state, so that the system can perform better.

[0130] In some embodiments, the specific process of adjusting the opening degree of the second throttling device according to the first refrigeration suction temperature difference of the air conditioning system in the refrigeration mode in step S840 is described in the following example.

[0131] The following describes the specific process of adjusting the opening degree of the second throttling device according to the first refrigeration suction temperature difference of the air conditioning system in the refrigeration mode in step S840 in combination with the embodiment flowchart of the method of the present application shown in Figure 10 The following describes the specific process of adjusting the opening degree of the second throttling device according to the first refrigeration suction temperature difference of the air conditioning system in the refrigeration mode in step S840 in combination with the embodiment flowchart of the method of the present application shown in

[0132] Step S1010, in the refrigeration mode, determine whether the first refrigeration suction temperature difference of the air conditioning system is greater than the set first refrigeration suction target value; wherein the set first refrigeration suction target value is, for example, the target value of ΔT suction 1 in the refrigeration mode. The target value of ΔT suction 1 is in the range of 3-5℃.

[0133] Step S1020, in the refrigeration mode, if it is determined that the first refrigeration suction temperature difference of the air conditioning system is greater than the set first refrigeration suction target value, then the opening degree of the second throttling device is increased by a set value based on the current value.

[0134] Step S1030: In cooling mode, if it is determined that the first cooling intake temperature difference of the air conditioning system is equal to the set first cooling intake target value, then the opening degree of the second throttling device is controlled to maintain the current value.

[0135] Step S1040: In cooling mode, if it is determined that the first cooling intake temperature difference of the air conditioning system is less than the set first cooling intake target value, then the opening of the second throttling device is controlled to be reduced by the set value based on the current value.

[0136] like Figure 14 As shown, Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device in the air conditioning system shown includes: in step 14, ΔT_suction1 = T_suction1 - T_inner_pipe1, where T_suction1 is the suction temperature of the first suction port of the compressor and T_inner_pipe1 is the pipe temperature of the indoor heat exchanger 1.

[0137] In step 14, the opening of valve B is adjusted according to ΔTintake1. Specifically, when ΔTintake1 is greater than the target value, the opening of valve B is increased; when ΔTintake1 is less than the target value, the opening of valve B is decreased. The target value range for ΔTintake1 is 3℃~5℃.

[0138] In the solution of this invention, in cooling mode, the opening degree of the second throttling device is adjusted according to the first cooling suction temperature difference of the air conditioning system, which can ensure that the air conditioning system operates energy-savingly and stably. The second throttling device mainly adjusts the high-temperature suction superheat. A negative high-temperature suction superheat may indicate liquid contamination; excessive superheat or insufficient refrigerant flow can both lead to poor system cooling capacity. The control method of this invention allows the second throttling device to be adjusted to an optimal state, enabling the system to perform better.

[0139] Step S850: In cooling mode, after a set time period, determine the difference between the second suction temperature of the compressor and the pipe temperature of the second indoor heat exchanger, and record it as the second cooling suction temperature difference of the air conditioning system (e.g., ΔT suction 2 in cooling mode); and adjust the opening of the third throttling device according to the second cooling suction temperature difference of the air conditioning system. Figure 14 As shown, Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device in the air conditioning system shown includes: step 15, after adjusting the opening of valve B according to ΔT_suction1 and running for t3 time, calculating ΔT_suction2, adjusting the opening of valve C according to ΔT_suction2, running for t3 time, and then executing step 16.

[0140] In some embodiments, the specific process of adjusting the opening degree of the third throttling device according to the second cooling absorption temperature difference of the air conditioning system in step S850 during cooling mode is described in the following exemplary description.

[0141] The following is combined with Figure 11 The schematic diagram shows an embodiment of the method of the present invention in which the opening degree of the third throttling device is adjusted according to the second refrigeration absorption temperature difference of the air conditioning system in the cooling mode. The specific process of adjusting the opening degree of the third throttling device according to the second refrigeration absorption temperature difference of the air conditioning system in the cooling mode in step S850 is further explained, including steps S1110 to S1140.

[0142] Step S1110: In cooling mode, determine whether the second cooling intake temperature difference of the air conditioning system is greater than the set second cooling intake target value; wherein, the set second cooling intake target value is such as the target value of ΔT intake 2 during cooling. The target value of ΔT intake 2 ranges from 3℃ to 5℃.

[0143] Step S1120: In cooling mode, if it is determined that the second cooling intake temperature difference of the air conditioning system is greater than the set second cooling intake target value, then the opening degree of the third throttling device is controlled to be increased by the set value based on the current value.

[0144] Step S1130: In cooling mode, if it is determined that the second cooling intake temperature difference of the air conditioning system is equal to the set second cooling intake target value, then the opening degree of the third throttling device is controlled to maintain the current value.

[0145] Step S1140: In cooling mode, if it is determined that the second cooling intake temperature difference of the air conditioning system is less than the set second cooling intake target value, then the opening of the third throttling device is controlled to be reduced by the set value based on the current value.

[0146] like Figure 14 As shown, Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device in the air conditioning system shown includes: in step 15, ΔT_suction2 = T_suction2 - T_inner_pipe2, where T_suction2 is the suction temperature of the second suction port of the compressor and T_inner_pipe2 is the pipe temperature of the indoor heat exchanger 2.

[0147] In step 15, the opening of valve C is adjusted according to ΔTintake2. Specifically, if ΔTintake2 is greater than the target value, the opening of valve C is increased; if it is less than the target value, the opening of valve C is decreased. The target value range for ΔTintake2 is 3℃~5℃. The opening range of valves A, B, and C is 0B~500B, and the opening range is adjusted by 10B~20B each time.

[0148] In the solution of this invention, in cooling mode, the opening degree of the third throttling device is adjusted according to the second cooling suction temperature difference of the air conditioning system, which can ensure that the air conditioning system operates energy-savingly and stably. The third throttling device mainly adjusts the low-temperature suction superheat. A negative low-temperature suction superheat may indicate liquid contamination; excessive superheat or insufficient refrigerant flow can both lead to poor system cooling capacity. The control method of this invention allows the third throttling device to be adjusted to an optimal state, enabling the system to achieve better performance.

[0149] Step S860: In cooling mode, after a set time period, determine whether the following conditions are met: the air conditioning system's supplementary temperature difference reaches the set supplementary gas target value; the air conditioning system's second cooling absorption temperature difference reaches the set first cooling absorption gas target value; and the air conditioning system's second cooling absorption temperature difference reaches the set second cooling absorption gas target value. If these conditions are met, maintain the current operation, that is, control the speed of the indoor and outdoor fans to their respective set speeds, the frequency of the compressor to the set frequency, the opening degree of the first throttling device to the current value, the opening degree of the second throttling device to the current value, and the opening degree of the third throttling device to the current value, and continue operation. If these conditions are not met, return to re-determine the supplementary temperature difference of the air conditioning system. Figure 14 As shown, Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device in the air conditioning system during cooling includes: Step 16, after adjusting the opening of valve C according to ΔT_suction 2 and running for time t3, determining whether ΔT_replenishment, ΔT_suction 1, and ΔT_suction 2 have reached the target values: if the target values ​​have not been reached, the opening of the corresponding throttling device continues to be adjusted according to ΔT_replenishment, ΔT_suction 1, and ΔT_suction 2; if the target values ​​have been reached, the system continues to operate at this frequency until shutdown or changes in the indoor and outdoor ambient temperature and set parameters. Specifically, when the indoor and outdoor ambient temperature and set parameters change, the opening of the corresponding throttling device continues to be adjusted according to ΔT_replenishment, ΔT_suction 1, and ΔT_suction 2. Specifically, when the indoor and outdoor ambient temperature and set parameters change, ΔT_replenishment, ΔT_suction 1, and ΔT_suction 2 are calculated based on the latest collected data, and the opening of the corresponding throttling device is adjusted accordingly. The opening range of valves A, B, and C is 0B to 500B, and the opening range is adjusted by 10B to 20B each time. The target range for ΔT supplemental gas is 2℃~3℃, and the target range for ΔT inhalation 1 and ΔT inhalation 2 is 3℃~5℃.

[0150] In the scheme of the present application, in the refrigeration mode, the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the air supplement temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, so that the air conditioning system can be stably operated and energy saving is guaranteed.

[0151] In the related scheme, the refrigeration operation first enters the four-pipe liquid accumulator (flash evaporator) through the second heat exchanger (medium-temperature evaporator); and in the scheme of the present application, the refrigerant from the three-pipe liquid accumulator (flash evaporator) enters the evaporator, and then is divided into high-temperature and low-temperature evaporators through the throttling device. When the related scheme is in the heating mode, the third throttling device is closed, which is equivalent to that the heat exchanger connected with the third throttling device does not participate in the circulation, and theoretically the heating capacity is reduced.

[0152] In the scheme of the present application, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (A valve), and a throttling device (B valve) in series, and the outlet of the outdoor heat exchanger is a three-way structure, one way of which is connected with a check valve + capillary tube, and the other way is connected with the throttling device A valve. When refrigeration is performed, the refrigerant can only enter the A valve from the condenser, and then enter the flash evaporator, as shown in FIG. 2(b). Figure 13 The evaporator 1 and the evaporator 2 of the indoor unit are made to have different temperatures through the throttling device (C valve), so that the double-evaporation temperature is realized.

[0153] According to the technical scheme of the embodiment, three throttling devices (such as A valve, B valve and C valve) are arranged for a three-cylinder air supplementing and double-temperature air conditioning system (namely, an air conditioning system with a three-cylinder compressor, a double-temperature indoor heat exchanger and a flash evaporator), the A valve is arranged in a pipeline between the flash evaporator and the indoor heat exchanger, the B valve is arranged in a pipeline between the double-temperature indoor heat exchanger and the flash evaporator, and the C valve is arranged in a pipeline of the indoor heat exchanger 2 in the double-temperature indoor heat exchanger (specifically, the C valve is arranged in a pipeline between the indoor heat exchanger 2 and the B valve in the double-temperature indoor heat exchanger); for the control strategy of the valve opening degree of the throttling device, three control modes are arranged: the first mode is to arrange a three-way valve, a capillary and a one-way valve, the three-way valve is communicated with the outdoor heat exchanger, the A valve and the one-way valve, and the capillary and the one-way valve can bypass the pipelines of the A valve, the flash evaporator and the B valve; the second mode is to arrange a capillary, and the capillary is arranged in a pipeline between the flash evaporator and the compressor; and the third mode is to arrange a capillary, and the capillary is arranged in a pipeline between the double-temperature indoor heat exchanger and the B valve; in the cooling mode, the control is performed based on the air supplementing temperature T of the flash evaporator, the high-temperature and low-temperature suction superheat degree of the compressor and the discharge superheat degree of the compressor; in the heating mode, in the first control mode, the control is performed based on the suction superheat degree 1 of the compressor; and in the second control mode and the third control mode, the control is performed based on the discharge superheat degree and the suction superheat degree 1 of the compressor, so that the throttling control under different conditions can be realized; thereby, by arranging the three throttling devices and arranging the auxiliary throttling device (specifically, arranging the capillary in different modes), the air supplementing amount of the compressor is controlled, and the heating performance is improved.

[0154] According to the embodiment of the present application, a control device of an air conditioning system corresponding to a control method of the air conditioning system is also provided. Referring to Figure 12 The structure diagram of an embodiment of the device of the present application is shown in FIG. 1. The air conditioning system is a three-cylinder air supplementing and double-temperature air conditioning system, and the three-cylinder air supplementing and double-temperature air conditioning system has a compressor, an outdoor heat exchanger, a double-temperature indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device. The double-temperature indoor heat exchanger includes a first indoor heat exchanger and a second indoor heat exchanger. The first throttling device is arranged on a pipeline between the flash evaporator and the outdoor heat exchanger. The second throttling device is arranged on a pipeline between the double-temperature indoor heat exchanger and the flash evaporator. The third throttling device is arranged on a pipeline on the side connected with the second throttling device of the second indoor heat exchanger (specifically, the third throttling device is arranged on the pipeline between the second indoor heat exchanger and the second throttling device, and not on the pipeline between the first indoor heat exchanger and the second throttling device). The auxiliary throttling device is arranged in the air supplementing pipeline of the compressor, and is used for assisting in adjusting the air supplementing amount of the compressor. The compressor is a three-cylinder compressor. The first indoor heat exchanger is arranged in the pipeline between the compressor and the second indoor heat exchanger, and the second indoor heat exchanger is arranged in the pipeline between the first indoor heat exchanger and the second throttling device. Figure 13 (a), Figure 15 and Figure 16condenser 1 in (a), Figure 13 evaporator 1 in (b), the second room heat exchanger such as Figure 13 (a), Figure 15 and Figure 16 condenser 2 in (a), Figure 13 evaporator 2 in (b), the outdoor heat exchanger such as Figure 13 (a), Figure 15 and Figure 16 evaporator in (a), Figure 13 condenser in (b), the first throttling device such as A valve, the second throttling device such as B valve, the third throttling device such as C valve, the auxiliary throttling device such as Figure 13 capillary and check valve in (a), Figure 15 capillary in (b), Figure 16 capillary in (c), etc.; in the scheme of the present application, as shown in (d), Figure 12 the control device of the air conditioning system, comprising: an acquisition unit 102 and a control unit 104.

[0155] The acquisition unit 102 is configured to, in the case of running the heating mode after the air conditioning system is started, acquire the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor (such as the exhaust temperature T of the compressor), acquire the first suction temperature of the compressor (specifically the suction temperature T of the first suction port of the compressor), and acquire the pipe temperature of the outdoor heat exchanger (such as the outdoor heat exchanger pipe temperature T) at a set period (such as time t2, the range of time t2 is 60-120 seconds). For specific functions and processing of the acquisition unit 102, see step S110.

[0156] The control unit 104 is configured to, in the heating mode, based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, control the rotation speed of the inner and outer fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device, to adjust the air charge of the compressor, so that the heating capacity of the air conditioning system is within the set heating capacity range. For specific functions and processing of the control unit 104, see step S120.

[0157] In the scheme of the present application, in the three-cylinder air-charged dual-temperature air conditioning system, an auxiliary throttling device is adopted when heating, such as a bypass throttling device (such as a capillary) and a selective combination of a check valve, which solves the problem of low heating capacity caused by unreasonable air charge, improves the heating effect of the system, and solves the problem of insufficient heating capacity of the three-cylinder air-charged dual-temperature air conditioning system.

[0158] In some embodiments, the auxiliary throttling device comprises: a first capillary tube, a one-way valve and a three-way valve, the first capillary tube being a capillary tube as shown in Figure 13 The bypass pipeline is arranged on a pipeline in which the first throttling device, the flash evaporator and the second throttling device are arranged; the first capillary tube and the one-way valve are arranged in series on the bypass pipeline; the first valve port of the three-way valve is connected to the outdoor heat exchanger, the second valve port of the three-way valve is connected to the outlet of the one-way valve, the first capillary tube is connected to the inlet of the one-way valve, and the third valve port of the three-way valve is connected to the first throttling device.

[0159] Figure 13 Structure schematic diagram of a first embodiment of an air conditioning system, wherein (a) is a structure schematic diagram of the air conditioning system in a heating mode, and (b) is a structure schematic diagram of the air conditioning system in a cooling mode. As shown in Figure 13 The air conditioning system comprises: a compressor (specifically a three-cylinder compressor), a four-way valve component 1, a four-way valve component 2, an outdoor heat exchanger (such as an evaporator in a heating mode), a three-way valve, an A valve, a flash evaporator, a B valve, a C valve, an indoor heat exchanger 1 (such as a condenser 1 in a heating mode), an indoor heat exchanger 2 (such as a condenser 2 in a heating mode), a one-way valve and a capillary tube. The exhaust port of the compressor is connected to the third valve port of the four-way valve component 1 and the first valve port of the four-way valve component 2, respectively; the second valve port of the four-way valve component 1 is connected to the second valve port of the four-way valve component 2, the first valve port of the four-way valve component 1 is connected to the second suction port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first suction port of the compressor. The fourth valve port of the four-way valve component 1 is connected to the first port of the flash evaporator through the indoor heat exchanger 2 and the C valve, and is connected to the second valve port of the three-way valve through the capillary tube and the one-way valve. The first valve port of the three-way valve is connected to the second valve port of the four-way valve component 1 through the outdoor heat exchanger. The third valve port of the three-way valve is connected to the second port of the flash evaporator through the A valve, and the third port of the flash evaporator is connected to the third suction port of the compressor. The fourth valve port of the four-way valve component 2 is connected to the common end of the B valve and the C valve through the indoor heat exchanger 1. The inlet of the one-way valve is an end connected to the capillary tube, that is, the one-way valve allows flow in the direction from the capillary tube to the second valve port of the three-way valve.

[0160] As shown in Figure 13As shown, in the scheme of the present application, the outdoor unit of the air conditioning system adopts a three-cylinder compressor + flash evaporator, and the indoor unit adopts a double-temperature evaporator, and multiple throttling devices are arranged. In addition to the capillary connected with the check valve, the air conditioning system in the scheme of the present application also adopts three throttling devices (A valve, B valve, and C valve), preferably an electronic expansion valve, and a programmable thermal expansion valve can also be used. The outlet of the outdoor heat exchanger is a three-way structure, one way is connected with a check valve + capillary, and the other way is connected with a throttling device A valve. When heating, the B valve is closed, and the refrigerant from the indoor heat exchanger passes through the capillary and the check valve, and enters the outdoor heat exchanger and the flash evaporator respectively, so as to adjust the air supplement amount and improve the heating performance. When cooling, the refrigerant from the outdoor heat exchanger enters the A valve and then enters the flash evaporator.

[0161] The control unit 104 controls the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device based on the outdoor environment temperature of the air conditioning system or the discharge temperature of the compressor and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger in the heating mode, including:

[0162] The control unit 104 is specifically further configured to determine whether the outdoor environment temperature of the air conditioning system is less than or equal to a set outdoor environment low temperature threshold in the heating mode; wherein the set outdoor environment low temperature threshold is, for example, a set T outdoor ring low temperature, and the low temperature range of the T outdoor ring is -5℃-2℃. The specific functions and processes of the control unit 104 are also referred to step S210.

[0163] The control unit 104 is specifically further configured to control the rotation speed of the indoor and outdoor fans to be respective set rotation speeds, the frequency of the compressor to be a set frequency, the opening degree of the first throttling device to be a set first initial opening degree, the opening degree of the second throttling device to be 0, and the opening degree of the third throttling device to be a set maximum opening degree if it is determined that the outdoor environment temperature of the air conditioning system is less than or equal to the set outdoor environment low temperature threshold in the heating mode; and after a set time length, adjust the opening degree of the first throttling device according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger; wherein the set time length is, for example, a time t1, and the range of the time t1 is 3-10 minutes. The set first initial opening degree is an initial opening degree 1 of the A valve. The range of the initial opening degree 1 of the A valve is 50B-100B. The specific functions and processes of the control unit 104 are also referred to step S220.

[0164] The control unit 104 is further configured to, in heating mode, if it is determined that the outdoor ambient temperature of the air conditioning system is greater than a set outdoor ambient low temperature threshold, control the rotation speed of the indoor and outdoor fans to their respective set rotation speeds, the frequency of the compressor to a set frequency, the opening degree of the first throttling device to a set second initial opening degree, the opening degree of the second throttling device to 0, and the opening degree of the third throttling device to a set maximum opening degree. The set second initial opening degree is the initial opening degree 2 of valve A. The range of the initial opening degree 2 of valve A is 150B to 300B. For the specific functions and processing of the control unit 104, please refer to step S230.

[0165] Figure 14 For example Figure 13 The diagram shows the valve opening control process of an air conditioning system. Figure 14 As shown, in the solution of the present invention, the air conditioning system uses the replenishment gas temperature, intake superheat, exhaust superheat, etc. to control the throttling device. In the present invention, the air conditioning system includes multiple temperature sensors. The indoor unit, in addition to an ambient temperature sensor to detect the indoor ambient temperature Tinner ring, also has two evaporator pipe temperature sensors to detect the pipe temperatures of the two indoor heat exchangers, such as Tinner pipe 1 and Tinner pipe 2 in cooling mode. In contrast, the air conditioning system in related solutions only has one inner pipe temperature sensor. The outdoor unit, in addition to an ambient temperature sensor to detect the outdoor ambient temperature Touter ring, an exhaust temperature sensor to detect the compressor's exhaust temperature Texhaust, and an outdoor heat exchanger pipe temperature sensor (such as a condenser pipe temperature sensor in cooling mode) to detect the outdoor heat exchanger pipe temperature Touter pipe, is also equipped with a gas injection temperature sensor located at the flash evaporator outlet (the third port of the flash evaporator, i.e., the port connecting the flash evaporator and the compressor) to detect the flash evaporator's gas injection temperature Tgas injection, a condenser outlet temperature sensor to detect the outdoor heat exchanger's outlet temperature Tcold outlet, and two suction temperature sensors to detect the compressor's suction temperature Tsuction 1 and Tsuction 2. The temperatures listed here are all actual values ​​measured by the temperature sensor. For example... Figure 14 As shown, the control strategy of the throttling device during heating is based on the compressor's suction superheat 1. Figure 14 As shown, Figure 13 The control strategy of the throttling device in the air conditioning system shown includes:

[0166] Step 21: After the air conditioning system is turned on, determine the operating mode. If it is in heating mode, collect the indoor and outdoor ambient temperature, set temperature, and set the fan speed in heating mode, and then proceed to step 22.

[0167] Step 22, judge whether the outdoor environment temperature Touter ring is less than or equal to the set Touter ring low temperature: if not, execute step 23; if yes, execute step 24. The set Touter ring low temperature is a low temperature range of Touter ring, and the low temperature range of Touter ring is -5℃ to 2℃.

[0168] Step 23, if the outdoor environment temperature Touter ring is not less than or equal to the set Touter ring low temperature, the initial opening degree of the valve (the initial opening degree 2 of A valve, B valve is closed, and C valve is the maximum opening degree) is set according to the program built-in inner and outer fan speed, compressor running frequency, and the initial opening degree of the valve, and the system is run until the system is shut down or the indoor and outdoor ring temperature and the set parameters are changed; wherein, when the indoor and outdoor ring temperature and the set parameters are changed, return to step 21. The range of the initial opening degree 2 of A valve is 150B to 300B.

[0169] Step 24, if the outdoor environment temperature Touter ring is less than or equal to the set Touter ring low temperature, the initial opening degree of the valve (the initial opening degree 1 of A valve, B valve is closed, and C valve is the maximum opening degree) is set according to the program built-in inner and outer fan speed, compressor running frequency, and the initial opening degree of the valve, and the system is run for t1 time, and then execute step 25. The range of the initial opening degree 1 of A valve is 50B to 100B.

[0170] In the scheme of the application, the capillary and the one-way valve are added, which functions to control the air supplement amount of the air conditioning system during heating operation, prevent the air supplement amount from being too large, and reduce the heating capacity due to air supplement with liquid. If there is no capillary and one-way valve, the refrigerant will enter the flash evaporator through the B valve, and then the liquid refrigerant enters the evaporator through the A valve, and the gaseous refrigerant enters the flash evaporator, which cannot well control the air supplement amount. The scheme of the application proposes a system for improving the heating capacity of a three-cylinder air supplement dual-temperature air conditioning system and a control scheme thereof. The air conditioning system includes but is not limited to wall-mounted air conditioners, cabinet air conditioners, multi-connected air conditioners, and the like. In the related scheme, the three-cylinder air supplement dual-temperature air conditioning system, the refrigerant goes out of the indoor heat exchanger, enters the flash evaporator through the B valve, and then part of it enters the third suction port of the compressor, and the other part enters the outdoor heat exchanger after passing through the A valve. Since the B valve may have noise under a small opening degree, the opening degree of the B valve can only take a large value. In this case, the air supplement amount entering the flash evaporator will be too large, which leads to air supplement with liquid, low exhaust temperature, poor heating capacity, and even unstable system operation.

[0171] In the scheme of the application, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (A valve), and a throttling device (B valve) in series, and the outlet of the outdoor heat exchanger is a three-way structure, one way of which is connected to a one-way valve + capillary, and the other way is connected to the throttling device A valve. During heating, the B valve is closed, the refrigerant goes out of the indoor heat exchanger, passes through the capillary and the one-way valve, and enters the outdoor heat exchanger and the flash evaporator, respectively. The separated refrigerant vapor in the flash evaporator enters the third suction port of the compressor, so as to adjust the air supplement amount and improve the heating performance. Figure 13 Fig. (a).

[0172] In the present invention, based on an auxiliary throttling device consisting of a first capillary tube and a one-way valve, in heating mode, based on the outdoor ambient temperature of the air conditioning system, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device can be controlled to adjust the gas supply and improve the heating performance.

[0173] In some embodiments, the control unit 104, in heating mode, adjusts the opening degree of the first throttling device according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, including:

[0174] The control unit 104 is further configured to, in heating mode, determine the difference between the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, and record it as the heating suction temperature difference of the air conditioning system (e.g., ΔT suction 1). The specific functions and processing of the control unit 104 are further described in step S310.

[0175] The control unit 104 is further configured to, in heating mode, determine whether the heating and suction temperature difference of the air conditioning system is greater than a set heating suction target value; wherein the set heating suction target value is, for example, the target value of ΔT suction 1. The target value of ΔT suction 1 ranges from 3℃ to 5℃. The specific functions and processing of the control unit 104 are further described in step S320.

[0176] The control unit 104 is further configured to, in heating mode, if it is determined that the heating and suction temperature difference of the air conditioning system is greater than the set heating suction target value, control the opening of the first throttling device to increase by a set value based on the current value, and then re-determine whether the heating and suction temperature difference of the air conditioning system is greater than the set heating suction target value. The specific functions and processing of this control unit 104 are further described in step S330.

[0177] Specifically, the control unit 104 is further configured to, in heating mode, if it is determined that the heating and suction air temperature difference of the air conditioning system is equal to the set heating and suction air target value, control the opening degree of the first throttling device to maintain the current value, and then control the speed of the indoor and outdoor fans to their respective set speeds, the frequency of the compressor to the set frequency, the opening degree of the first throttling device to the current value, the opening degree of the second throttling device to 0, and the opening degree of the third throttling device to the set maximum opening degree to continue operation. The specific functions and processing of this control unit 104 are further described in step S340.

[0178] The control unit 104 is further configured to, in the heating mode, if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, control the opening degree of the first throttling device to be reduced by a set value based on the current value, and then re-determine whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value. The specific functions and processes of the control unit 104 are also described in step S350.

[0179] Specifically, as shown in Figure 14 , the control strategy of the throttling device of the air conditioning system in the heating mode further includes: Figure 13

[0180] Step 25: After running for t1 time, calculate ATsuction1 = Tsuction1 - Touter tube, and if ATsuction1 is greater than the target value, increase the opening degree of A valve, and if ATsuction1 is less than the target value, decrease the opening degree of A valve, and then perform step 26. Tsuction1 is the suction temperature of the first suction port of the compressor, and Touter tube is the tube temperature of the outdoor heat exchanger. The opening degree range of A valve, B valve and C valve is all 0B-500B, and the opening degree range of each adjustment is 10B-20B.

[0181] Step 26: After running for t3 time, determine whether ATsuction1 reaches the target value: if not, continue to adjust the opening degree of A valve according to ATsuction1, and if yes, run at this frequency opening degree until shutdown or the indoor and outdoor ring temperatures and the set parameters change. When the indoor and outdoor ring temperatures and the set parameters change, return to step 21.

[0182] In the scheme of the application, based on the auxiliary throttling device composed of the first capillary and the one-way valve, in the heating mode, the opening degree of the first throttling device is adjusted according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, so that the air charge amount can be adjusted and the heating performance can be improved.

[0183] In some embodiments, the auxiliary throttling device further includes a second capillary or a fourth throttling device; or the auxiliary throttling device further includes a third capillary or a fifth throttling device, the second capillary is as Figure 15 the capillary in the first embodiment, and the third capillary is as Figure 16 the capillary in the second embodiment; the second capillary or the fourth throttling device is arranged in the pipeline between the flash tank and the compressor, specifically arranged in the pipeline between the flash tank and the third suction port of the compressor; and the third capillary or the fifth throttling device is arranged in the pipeline between the double-room indoor heat exchanger and the second throttling device.

[0184] Figure 15 The structure diagram of the second embodiment of the air conditioning system, specifically the structure diagram of the air conditioning system in the heating mode. Figure 15 ​For the second system that is beneficial to improve the heating performance, a capillary tube (or an electronic expansion valve) is connected between the outlet of the flash tank and the inlet of the compressor to control the amount of air supplement. As shown in Figure 15 The air conditioning system includes a compressor (specifically a three-cylinder compressor), a four-way valve component 1, a four-way valve component 2, an outdoor heat exchanger (such as an evaporator in the heating mode), an A valve, a flash tank, a B valve, a C valve, an indoor heat exchanger 1 (such as a condenser 1 in the heating mode), an indoor heat exchanger 2 (such as a condenser 2 in the heating mode), and a capillary tube. The exhaust port of the compressor is connected to the third valve port of the four-way valve component 1 and the first valve port of the four-way valve component 2, respectively. The second valve port of the four-way valve component 1 is connected to the second valve port of the four-way valve component 2. The first valve port of the four-way valve component 1 is connected to the second suction port of the compressor. The third valve port of the four-way valve component 2 is connected to the first suction port of the compressor. The fourth valve port of the four-way valve component 1 is connected to the first port of the flash tank through the indoor heat exchanger 2, the C valve, and the B valve. The second port of the flash tank is connected to the second valve port of the four-way valve component 1 through the A valve and the indoor heat exchanger. The third port of the flash tank is connected to the third suction port of the compressor through the capillary tube. The fourth valve port of the four-way valve component 2 is connected to the common end of the B valve and the C valve through the indoor heat exchanger 1.

[0185] Figure 16 The third embodiment of the structure of the air conditioning system is shown in the figure. Specifically, it is the structure of the air conditioning system in the heating mode. Figure 16 For the third system that is beneficial to improve the heating performance, a capillary tube (or an electronic expansion valve) is connected in series before the B valve. As shown in Figure 16 The air conditioning system includes a compressor (specifically a three-cylinder compressor), a four-way valve component 1, a four-way valve component 2, an outdoor heat exchanger (such as an evaporator in the heating mode), an A valve, a flash tank, a B valve, a C valve, an indoor heat exchanger 1 (such as a condenser 1 in the heating mode), an indoor heat exchanger 2 (such as a condenser 2 in the heating mode), and a capillary tube. The exhaust port of the compressor is connected to the third valve port of the four-way valve component 1 and the first valve port of the four-way valve component 2, respectively. The second valve port of the four-way valve component 1 is connected to the second valve port of the four-way valve component 2. The first valve port of the four-way valve component 1 is connected to the second suction port of the compressor. The third valve port of the four-way valve component 2 is connected to the first suction port of the compressor. The fourth valve port of the four-way valve component 1 is connected to the first port of the flash tank through the indoor heat exchanger 2, the C valve, and the B valve. The second port of the flash tank is connected to the second valve port of the four-way valve component 1 through the A valve and the indoor heat exchanger. The third port of the flash tank is connected to the third suction port of the compressor through the capillary tube. The fourth valve port of the four-way valve component 2 is connected to the common end of the B valve and the C valve through the indoor heat exchanger 1.

[0186] wherein, Figure 15 and Figure 16The main purpose is to control the amount of gas supplied to the flash evaporator to prevent excessive gas supply, which would lead to liquid carryover and reduce calorific value.

[0187] The control unit 104, in heating mode, controls the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device based on the outdoor ambient temperature of the air conditioning system or the discharge temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger. It also includes:

[0188] Specifically, the control unit 104 is further configured to, in heating mode, control the rotational speed of the indoor and outdoor fans to their respective set rotational speeds, the frequency of the compressor to a set frequency, the opening degree of the first throttling device and the second throttling device to their respective set opening degrees, and the opening degree of the third throttling device to a set maximum opening degree. The specific functions and processing of this control unit 104 are further described in step S410. Figure 17 for Figure 15 and Figure 16 The diagram shows the valve opening control process of an air conditioning system in heating mode. Figure 15 and Figure 16 In the example shown, the valve opening control mode remains unchanged in cooling mode, but the operating parameters will differ due to the different positions of the capillary tubes connected in series. For example... Figure 17 As shown, the valve opening control strategy in heating mode is based on the compressor's discharge superheat and suction superheat. Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode is shown as follows: Step 31: After starting the system, determine the operating mode. If it is heating mode, collect the indoor and outdoor ambient temperature, set temperature, set fan speed, and internal and external fan speeds, compressor operating frequency and initial valve opening (valve C always maintains the maximum opening in heating mode) according to the built-in program, run for t1 time, and then execute step 32.

[0189] The control unit 104 is further configured to, in heating mode, adjust the opening of the second throttling device according to the compressor's exhaust temperature after a set duration. The specific functions and processing of this control unit 104 are further described in step S420. The set duration is, for example, time t1. Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode shown includes: step 32, collecting temperature sensor data at a cycle t2, adjusting the opening of valve B according to the exhaust temperature T of the compressor, and then executing step 33.

[0190] In some embodiments, the control unit 104, in heating mode, adjusts the opening degree of the second throttling device according to the exhaust temperature of the compressor, including:

[0191] The control unit 104 is further configured to, in heating mode, determine the relationship between the compressor's exhaust temperature and a set first exhaust temperature threshold, a set second exhaust temperature threshold, and a set third exhaust temperature threshold; wherein the set first exhaust temperature threshold is less than the set second exhaust temperature threshold, the set first exhaust temperature threshold is greater than the set third exhaust temperature threshold, the set exhaust temperature target value is the set third exhaust temperature threshold, the set first exhaust temperature threshold is such as the target value T_exhaust_B1, the set second exhaust temperature threshold is such as the target value T_exhaust_B2, and the set third exhaust temperature threshold is such as the target value T_exhaust_B3. The specific functions and processing of this control unit 104 are further described in step S510.

[0192] The control unit 104 is further configured to, in heating mode, if it is determined that the exhaust temperature of the compressor is greater than or equal to a set first exhaust temperature threshold and less than a set second exhaust temperature threshold, increase the opening of the second throttling device by a set first opening value based on the current value; wherein the set first opening value is, for example, K_exhaust_B1. The specific functions and processing of the control unit 104 are further described in step S520.

[0193] The control unit 104 is further configured to, in heating mode, if it is determined that the exhaust temperature of the compressor is greater than or equal to a set second exhaust temperature threshold, increase the opening of the second throttling device by a set second opening value based on the current value, wherein the set second opening value is greater than a set first opening value; wherein the set second opening value is, for example, K_exhaust_B2. The specific functions and processing of the control unit 104 are further described in step S530.

[0194] The control unit 104 is further configured to, in heating mode, if it is determined that the exhaust temperature of the compressor is less than a set third exhaust temperature threshold, restore the current value of the opening of the second throttling device to the set opening of the second throttling device. The specific functions and processing of this control unit 104 are further described in step S540.

[0195] like Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode, as shown, further includes: in step 32, adjusting the opening of valve B according to the compressor's exhaust temperature T, specifically including:

[0196] ① When the exhaust temperature of the compressor T exhaust ≥ T exhaust B1, the B valve increases the current opening degree by K exhaust B1;

[0197] ② When the exhaust temperature of the compressor T exhaust ≥ T exhaust B2, the B valve increases the current opening degree by K exhaust B2;

[0198] ③ When the exhaust temperature of the compressor T exhaust < T exhaust B3, the B valve restores the reference opening degree.

[0199] Wherein, the range of the target value of T exhaust B1 is (88℃-92℃), the range of K exhaust B1 is (4B-6B); the range of the target value of T exhaust B2 is (93℃-97℃), the range of K exhaust B2 is (8B-10B); the range of the target value of T exhaust B3 is (75℃-85℃).

[0200] In the scheme of the application, based on the auxiliary throttling device composed of the second capillary or the third capillary, in the heating mode, the opening degree of the second throttling device is adjusted according to the exhaust temperature of the compressor, so that the air charge amount can be adjusted and the heating performance can be improved.

[0201] The control unit 104 is specifically further configured to, in the heating mode, determine the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger after a set period of time, denoted as the heating suction temperature difference of the air conditioning system (such as ΔT suction 1 in the heating mode); and adjust the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system. The specific functions and processes of the control unit 104 also refer to step S430. Wherein, the set period of time is, for example, t3 time, and the range of time t3 is 120-180 seconds. As shown in FIG. 8, the control unit 104 adjusts the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system in the heating mode, including: Figure 17 Figure 15 and Figure 16 The opening degree control process of the valve of the air conditioning system in the heating mode as shown in FIG. 8 further includes: step 33, adjusting the opening degree of the A valve according to ΔT suction 1, and then performing step 34.

[0202] In some embodiments, the control unit 104 adjusts the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system in the heating mode, including:

[0203] The control unit 104 is specifically further configured to, in the heating mode, determine whether the heating suction temperature difference of the air conditioning system is greater than a set heating suction target value; wherein the set heating suction target value is, for example, the target value of ΔT suction 1. The range of the target value of ΔT suction 1 is 3-5℃. The specific functions and processes of the control unit 104 also refer to step S610.

[0204] ​The control unit 104 is further configured to, in the heating mode, if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, control the opening degree of the first throttling device to be increased by a set value based on the current value, and then determine whether the discharge temperature of the compressor reaches the set discharge temperature target value and the heating suction temperature difference of the air conditioning system reaches the set heating suction target value. The specific functions and processes of the control unit 104 are also described in step S620.

[0205] The control unit 104 is further configured to, in the heating mode, if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, control the opening degree of the first throttling device to maintain the current value, and then determine whether the discharge temperature of the compressor reaches the set discharge temperature target value and the heating suction temperature difference of the air conditioning system reaches the set heating suction target value. The specific functions and processes of the control unit 104 are also described in step S630.

[0206] The control unit 104 is further configured to, in the heating mode, if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, control the opening degree of the first throttling device to be decreased by a set value based on the current value, and then determine whether the discharge temperature of the compressor reaches the set discharge temperature target value and the heating suction temperature difference of the air conditioning system reaches the set heating suction target value. The specific functions and processes of the control unit 104 are also described in step S640.

[0207] As shown in FIG. 6, Figure 17 As shown in FIG. 6, Figure 15 and Figure 16 The opening degree control process of the valve of the air conditioning system in the heating mode also includes: in step 33, after adjusting the opening degree of the valve according to the discharge temperature Tdischarge of the compressor for t3 time, calculating ATsuction1=Tsuction1-Tout, and adjusting the opening degree of the valve when ATsuction1 is greater than the target value, and adjusting the opening degree of the valve when ATsuction1 is less than the target value, and then executing step 34. The opening degree range of the valve is 0B-500B, and the opening degree range is adjusted by 10B-20B each time.

[0208] In the scheme of the application, based on the auxiliary throttling device composed of the second capillary or the third capillary, in the heating mode, the opening degree of the first throttling device is adjusted according to the heating suction temperature difference of the air conditioning system, which can adjust the air supplement and improve the heating performance.

[0209] The control unit 104 is further configured to, in heating mode, after a set time period, determine whether the compressor's exhaust temperature reaches a set target value and the heating-suction temperature difference of the air conditioning system reaches a set target value. If satisfied, it maintains current operation, i.e., controlling the speed of the indoor and outdoor fans to their respective set speeds, the compressor frequency to a set frequency, the opening degree of the first throttling device to its current value, the opening degree of the second throttling device to its current value, and the opening degree of the third throttling device to its set maximum opening degree; if not satisfied, it returns to redetermine the heating-suction temperature difference of the air conditioning system and readjusts the opening degree of the first throttling device according to the heating-suction temperature difference of the air conditioning system. The specific functions and processing of this control unit 104 are also described in step S440. Figure 17 As shown, Figure 15 and Figure 16 The valve opening control process of the air conditioning system in heating mode, as shown, further includes: Step 34, after running for time t3, determining whether T_exhaust and ΔT_intake 1 have reached the target values: if the target values ​​have not been reached, continue adjusting the opening of the corresponding throttling device according to T_exhaust and ΔT_intake 1; if the target values ​​have been reached, continue operating at this frequency until shutdown or a change in the indoor / outdoor ambient temperature setting parameters. Specifically, when the indoor / outdoor ambient temperature setting parameters change, continue adjusting the opening of the corresponding throttling device according to T_exhaust and ΔT_intake 1.

[0210] In the present invention, based on an auxiliary throttling device composed of a second capillary tube or a third capillary tube, in heating mode, the speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled according to the exhaust temperature of the compressor and the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, thereby adjusting the gas supply and improving the heating performance.

[0211] In some embodiments, the control system of the air conditioning system described in this invention further includes:

[0212] The acquisition unit 102 is further configured to, when the air conditioning system is turned on and running in cooling mode, acquire, at a set cycle, the outlet temperature of the outdoor heat exchanger (e.g., T_cold_outlet), the pipe temperature of the first indoor heat exchanger (e.g., T_inner_pipe1), the pipe temperature of the second indoor heat exchanger (e.g., T_inner_pipe2), the make-up gas temperature of the flash evaporator (e.g., T_make-up_gas), the first suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor, T_suction1), and the second suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor, T_suction2). The specific functions and processing of this acquisition unit 102 are further described in step S710.

[0213] The control unit 104 is further configured to, in the cooling mode, control the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device of the air conditioning system in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, so as to adjust the amount of the compressor recharging air, and make the cooling capacity of the air conditioning system in an optimal state. The specific functions and processes of the control unit 104 are also described with reference to step S720.

[0214] The control of the frequency of the compressor of the air conditioning system in the scheme of the present application is similar to the control scheme of the air conditioning system in the related scheme, which is mainly determined by the indoor and outdoor environment temperature, the set temperature and the air damper, and the temperature difference between the indoor environment temperature and the set temperature, and is not described in detail. Different from the control scheme of the air conditioning system in the related scheme, the throttling device of the air conditioning system in the scheme of the present application is controlled by using the parameters such as the recharging air temperature difference, the multiple suction superheat, and the discharge superheat, so as to ensure the energy-saving and stable operation of the system.

[0215] In some embodiments, the control unit 104, in the cooling mode, controls the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device of the air conditioning system in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, including:

[0216] The control unit 104 is further configured to, in the cooling mode, control the rotation speed of the indoor and outdoor fans to be the respective set rotation speeds, control the frequency of the compressor to be the set frequency, and control the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device to be the respective set opening degrees. The specific functions and processes of the control unit 104 are also described with reference to step S810. As shown in Figure 14 As shown in Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device of the air conditioning system in the cooling mode is controlled based on the recharging air temperature T of the flash evaporator, the high and low temperature suction superheat of the compressor, and the discharge superheat of the compressor. As shown in Figure 14 As shown in Figure 13 , Figure 15 and Figure 16The control strategy of the throttling device of the air conditioning system in the cooling mode includes the following steps: step 11, determining the operation mode after the air conditioning system is started, and if the operation mode is the cooling mode, collecting the indoor and outdoor environment temperatures, the set temperature, and the set air damper in the cooling mode, running the t1 time according to the initial opening degree of the program built-in indoor and outdoor fan speed, compressor operation frequency, and valve, and then performing step 12. The time t1 ranges from 3 to 10 minutes.

[0217] The control unit 104 is specifically further configured to, in the cooling mode, determine the average value of the tube temperatures of the first indoor heat exchanger and the second indoor heat exchanger as a first average value, determine the average value of the first average value and the outlet temperature of the outdoor heat exchanger as a second average value (such as the T intermediate temperature), and determine the difference between the second average value and the flash evaporator gas supplement temperature as the gas supplement temperature difference (such as ΔT gas supplement) of the air conditioning system. The specific functions and processes of the control unit 104 also refer to step S820. As shown in Figure 14 Figure 13 Figure 15 Figure 16 The control strategy of the throttling device of the air conditioning system in the cooling mode also includes the following steps: step 12, collecting the temperature sensing bag data according to the period t2, calculating the T intermediate temperature and ΔT gas supplement, and then performing step 13.

[0218] In step 12, the T intermediate temperature = [T cold out + (T inner tube 1 + T inner tube 2) / 2] / 2, where T cold out is the outlet temperature of the outdoor heat exchanger, T inner tube 1 is the tube temperature of the indoor heat exchanger 1, and T inner tube 2 is the tube temperature of the indoor heat exchanger 2. In step 12, ΔT gas supplement = T intermediate temperature - T gas supplement; where T gas supplement is the temperature of the third port of the flash evaporator, i.e., the port of the flash evaporator connected with the compressor.

[0219] The control unit 104 is specifically further configured to, in the cooling mode, adjust the opening degree of the first throttling device according to the gas supplement temperature difference of the air conditioning system. The specific functions and processes of the control unit 104 also refer to step S830. As shown in Figure 14 Figure 13 Figure 15 Figure 16 The control strategy of the throttling device of the air conditioning system in the cooling mode also includes the following steps: step 13, adjusting the opening degree of the A valve according to ΔT gas supplement, running t3 time, and then performing step 14.

[0220] In some embodiments, the control unit 104, in the cooling mode, adjusts the opening degree of the first throttling device according to the gas supplement temperature difference of the air conditioning system, including:

[0221] ​​​​​​The control unit 104 is further configured to determine, in cooling mode, whether the temperature difference between the air conditioning system's replenishment temperature and the target replenishment temperature is greater than a set target value. The specific functions and processing of the control unit 104 are further described in step S910. The set target replenishment temperature is, for example, the target value of ΔT. The target value of ΔT ranges from 2°C to 3°C.

[0222] The control unit 104 is further configured to, in cooling mode, if it is determined that the temperature difference between the air supply and the replenishment temperature of the air conditioning system is greater than a set target value for replenishment gas, control the opening of the first throttling device to be increased by a set value based on the current value. The specific functions and processing of this control unit 104 are further described in step S920.

[0223] The control unit 104 is further configured to, in cooling mode, if it is determined that the temperature difference between the air supply and the air conditioning system is equal to the set target value for air supply, control the opening of the first throttling device to maintain the current value. The specific functions and processing of the control unit 104 are further described in step S930.

[0224] The control unit 104 is further configured to, in cooling mode, if it is determined that the temperature difference between the air supply and the replenishment temperature of the air conditioning system is less than a set target value for replenishment gas, control the opening of the first throttling device to be reduced by a set value based on the current value. The specific functions and processing of this control unit 104 are further described in step S940.

[0225] like Figure 14 As shown, Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device in the air conditioning system shown includes the following steps in step 13: when the ΔT replenishment gas value is greater than the target value, the opening of valve A is increased; when the ΔT replenishment gas value is less than the target value, the opening of valve A is decreased. The target value range for ΔT replenishment gas is 2℃ to 3℃.

[0226] In the solution of the present invention, in the cooling mode, the opening degree of the first throttling device is adjusted according to the temperature difference of the air conditioning system, which can ensure that the air conditioning system is energy-saving and operates stably.

[0227] The control unit 104 is further configured to, in cooling mode, after a set time period, determine the difference between the first suction temperature of the compressor and the pipe temperature of the first indoor heat exchanger, and record it as the first cooling suction temperature difference of the air conditioning system (e.g., ΔT suction 1 in cooling mode); and adjust the opening degree of the second throttling device according to the first cooling suction temperature difference of the air conditioning system. The specific functions and processing of this control unit 104 are further described in step S840. Figure 14 As shown, Figure 13 , Figure 15 and Figure 16The control strategy of the throttling device of the air conditioning system in cooling mode further comprises: in step 14, after operating the opening degree of the A valve according to the ΔT supplement for t3 time, calculating the ΔT suction 1, adjusting the opening degree of the B valve according to the ΔT suction 1, operating for t3 time, and then performing step 15. The time t3 ranges from 120 seconds to 180 seconds.

[0228] In some embodiments, the control unit 104, in the cooling mode, adjusts the opening degree of the second throttling device according to the first cooling suction temperature difference of the air conditioning system, comprising:

[0229] The control unit 104 is specifically further configured to determine whether the first cooling suction temperature difference of the air conditioning system is greater than a set first cooling suction target value in the cooling mode. The specific functions and processes of the control unit 104 are also described in step S1010. The set first cooling suction target value is, for example, the target value of the ΔT suction 1 in cooling. The target value of the ΔT suction 1 ranges from 3°C to 5°C.

[0230] The control unit 104 is specifically further configured to control the opening degree of the second throttling device to be larger than the current value by a set value if it is determined that the first cooling suction temperature difference of the air conditioning system is greater than the set first cooling suction target value in the cooling mode. The specific functions and processes of the control unit 104 are also described in step S1020.

[0231] The control unit 104 is specifically further configured to control the opening degree of the second throttling device to maintain the current value if it is determined that the first cooling suction temperature difference of the air conditioning system is equal to the set first cooling suction target value in the cooling mode. The specific functions and processes of the control unit 104 are also described in step S1030.

[0232] The control unit 104 is specifically further configured to control the opening degree of the second throttling device to be smaller than the current value by a set value if it is determined that the first cooling suction temperature difference of the air conditioning system is less than the set first cooling suction target value in the cooling mode. The specific functions and processes of the control unit 104 are also described in step S1040.

[0233] As shown in Figure 14 As shown in Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device of the air conditioning system in cooling mode further comprises: in step 14, ΔT suction 1 = T suction 1 - T inner tube 1, T suction 1 is the suction temperature of the first suction port of the compressor, and T inner tube 1 is the tube temperature of the indoor heat exchanger 1.

[0234] In step 14, the opening of valve B is adjusted according to ΔTintake1. Specifically, when ΔTintake1 is greater than the target value, the opening of valve B is increased; when ΔTintake1 is less than the target value, the opening of valve B is decreased. The target value range for ΔTintake1 is 3℃~5℃.

[0235] In the solution of the present invention, in the cooling mode, the opening degree of the second throttling device is adjusted according to the first cooling absorption temperature difference of the air conditioning system, which can ensure that the air conditioning system is energy-saving and operates stably.

[0236] The control unit 104 is further configured to, in cooling mode, after a set time period, determine the difference between the second suction temperature of the compressor and the pipe temperature of the second indoor heat exchanger, and record it as the second cooling suction temperature difference of the air conditioning system (e.g., ΔT suction 2 in cooling mode); and adjust the opening degree of the third throttling device according to the second cooling suction temperature difference of the air conditioning system. The specific functions and processing of this control unit 104 are further described in step S850. Figure 14 As shown, Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device in the air conditioning system shown includes: step 15, after adjusting the opening of valve B according to ΔT_suction1 and running for t3 time, calculating ΔT_suction2, adjusting the opening of valve C according to ΔT_suction2, running for t3 time, and then executing step 16.

[0237] In some embodiments, the control unit 104, in cooling mode, adjusts the opening degree of the third throttling device according to the second cooling suction temperature difference of the air conditioning system, including:

[0238] The control unit 104 is further configured to, in cooling mode, determine whether the second cooling intake temperature difference of the air conditioning system is greater than a set second cooling intake target value. The specific functions and processing of the control unit 104 are further described in step S1110. The set second cooling intake target value is, for example, the target value of ΔT intake 2 during cooling. The target value of ΔT intake 2 ranges from 3℃ to 5℃.

[0239] The control unit 104 is further configured to, in cooling mode, if it is determined that the second cooling suction temperature difference of the air conditioning system is greater than the set second cooling suction target value, control the opening of the third throttling device to increase by a set value based on the current value. The specific functions and processing of this control unit 104 are further described in step S1120.

[0240] The control unit 104 is further configured to, in the cooling mode, if it is determined that the second cooling suction temperature difference of the air conditioning system is equal to the set second cooling suction target value, control the opening degree of the third throttling device to maintain the current value. The specific functions and processes of the control unit 104 are also described in step S1130.

[0241] The control unit 104 is further configured to, in the cooling mode, if it is determined that the second cooling suction temperature difference of the air conditioning system is less than the set second cooling suction target value, control the opening degree of the third throttling device to be smaller than the current value by a set value. The specific functions and processes of the control unit 104 are also described in step S1140.

[0242] As shown in Figure 14 As shown in Figure 13 , Figure 15 and Figure 16 The control strategy of the throttling device of the air conditioning system in the cooling mode also includes: in step 15, ΔT suction 2 = T suction 2 - T inner tube 2, T suction 2 is the suction temperature of the second suction port of the compressor, and T inner tube 2 is the tube temperature of the indoor heat exchanger 2.

[0243] In step 15, the opening degree of the C valve is adjusted according to ΔT suction 2, specifically: the opening degree of the C valve is increased when ΔT suction 2 is greater than the target value, and the opening degree of the C valve is decreased when ΔT suction 2 is less than the target value. The target value range of ΔT suction 2 is 3-5°C. The opening degree range of the A valve, the B valve and the C valve is all 0B-500B, and the opening degree range of each adjustment is 10B-20B.

[0244] In the scheme of the application, in the cooling mode, the opening degree of the third throttling device is adjusted according to the second cooling suction temperature difference of the air conditioning system, so that the air conditioning system can be ensured to operate stably and energy-savingly.

[0245] The control unit 104 is further configured to, in the cooling mode, after the set time period, determine whether the air conditioning system satisfies the following conditions: the air supplement temperature difference reaches the set air supplement target value, the second cooling suction temperature difference of the air conditioning system reaches the set first cooling suction target value, and the second cooling suction temperature difference of the air conditioning system reaches the set second cooling suction target value: if yes, the current operation is maintained, that is, the rotation speed of the indoor and outdoor fans is controlled to be the set rotation speed, the frequency of the compressor is controlled to be the set frequency, the opening degree of the first throttling device is controlled to be the current value, the opening degree of the second throttling device is controlled to be the current value, and the opening degree of the third throttling device is controlled to be the current value continue to operate; if no, return to determine the air supplement temperature difference of the air conditioning system again. The specific functions and processes of the control unit 104 are also described in step S860. As shown in Figure 14 As shown in Figure 13 , Figure 15 and Figure 16The control strategy of the throttling device of the air conditioning system shown during refrigeration also includes: step 16, after adjusting the opening of the C valve according to ΔT supplement air, ΔT suction air 1 and ΔT suction air 2 for t3 time, it is judged whether ΔT supplement air, ΔT suction air 1 and ΔT suction air 2 reach the target value: if the target value is not reached, the opening of the corresponding throttling device is continuously adjusted according to ΔT supplement air, ΔT suction air 1 and ΔT suction air 2, and if the target value is reached, the frequency opening is operated until the machine is turned off or the indoor and outdoor ring temperatures and the set parameters are changed. Wherein, when the indoor and outdoor ring temperatures and the set parameters are changed, the opening of the corresponding throttling device is continuously adjusted according to ΔT supplement air, ΔT suction air 1 and ΔT suction air 2. Wherein, the opening range of A valve, B valve and C valve is 0B-500B, and the opening range of each adjustment is 10B-20B. The target value range of ΔT supplement air is 2-3℃, and the target value range of ΔT suction air 1 and ΔT suction air 2 is 3-5℃.

[0246] In the scheme of the present application, in the refrigeration mode, the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the supplement air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor are combined to control the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device, so that the air conditioning system can be guaranteed to run stably and save energy.

[0247] In the related scheme, refrigeration runs first through the second heat exchanger (medium-temperature evaporator) into the four-pipe liquid accumulator (flash evaporator); and in the scheme of the present application, the refrigerant from the three-pipe liquid tank (flash evaporator) enters the evaporator, and then is divided into high-temperature and low-temperature evaporators through the throttling device.

[0248] In the scheme of the present application, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (A valve) and a throttling device (B valve) in series, and the outlet of the outdoor heat exchanger is a three-way structure, one way of which is connected with a one-way valve + capillary, and the other way is connected with the throttling device A valve. During refrigeration, the refrigerant can only enter the A valve from the condenser, and then enter the flash evaporator, as shown in FIG. b. Figure 13 The evaporator 1 and the evaporator 2 have different temperatures through the throttling device (C valve), so that the double-evaporation temperature is realized.

[0249] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0250] According to the embodiments of the present application, an air conditioning system corresponding to the control device of the air conditioning system is also provided. The air conditioning system can include the control device of the air conditioning system described above.

[0251] Since the processing and functions realized by the air conditioning system of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the device, the descriptions of the present embodiment which are not elaborated can be seen in the related descriptions of the foregoing embodiments, which will not be repeated here.

[0252] According to the embodiments of the present application, a computer program product corresponding to the air conditioning system is also provided, which comprises a computer program, and the computer program realizes the steps of the control method of the air conditioning system when executed by a processor.

[0253] Since the processing and functions realized by the product of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the air conditioning system, the descriptions of the present embodiment which are not elaborated can be seen in the related descriptions of the foregoing embodiments, which will not be repeated here.

[0254] According to the embodiments of the present application, a storage medium corresponding to the control method of the air conditioning system is also provided, which comprises a stored program, and the program controls the device where the storage medium is located to execute the steps of the control method of the air conditioning system when running.

[0255] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the descriptions of the present embodiment which are not elaborated can be seen in the related descriptions of the foregoing embodiments, which will not be repeated here.

[0256] In summary, the person skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0257] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can have various modifications and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of an air conditioning system, characterized by, The air conditioning system has a compressor, an outdoor heat exchanger, a double indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device, the double indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, the first throttling device is arranged on a pipeline between the flash evaporator and the outdoor heat exchanger, the second throttling device is arranged on a pipeline between the double indoor heat exchanger and the flash evaporator, the third throttling device is arranged on a pipeline on a side connected with the second throttling device of the second indoor heat exchanger, and the auxiliary throttling device is used for assisting in adjusting a charge amount of the compressor; and a control method of the air conditioning system comprises the following steps. In a case that the air conditioning system runs in a heating mode after being started, an outdoor environment temperature of the air conditioning system or an exhaust temperature of the compressor is obtained according to a set period, a first suction temperature of the compressor is obtained, and a pipe temperature of the outdoor heat exchanger is obtained; Based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device are controlled; Further comprising: In a case that the air conditioning system runs in a cooling mode after being started, an outlet temperature of the outdoor heat exchanger is obtained according to a set period, a pipe temperature of the first indoor heat exchanger is obtained, a pipe temperature of the second indoor heat exchanger is obtained, a charge temperature of the flash evaporator is obtained, a first suction temperature of the compressor is obtained, and a second suction temperature of the compressor is obtained; Based on the outlet temperature of the outdoor heat exchanger, the pipe temperature of the first indoor heat exchanger, the pipe temperature of the second indoor heat exchanger, the charge temperature of the flash evaporator, the first suction temperature of the compressor and the second suction temperature of the compressor, the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device are controlled.

2. The control method of the air conditioning system according to claim 1, characterized by, The auxiliary throttling device comprises a first capillary, a one-way valve and a three-way valve; a bypass pipeline is arranged on a pipeline where the first throttling device, the flash evaporator and the second throttling device are located; the first capillary and the one-way valve are arranged in series on the bypass pipeline; a first valve port of the three-way valve is connected with the outdoor heat exchanger, a second valve port of the three-way valve is connected with an outlet of the one-way valve, the first capillary is connected with an inlet of the one-way valve, and a third valve port of the three-way valve is connected with the first throttling device; Based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device and the opening degree of the third throttling device are controlled, comprising: determining whether the outdoor ambient temperature of the air conditioning system is less than or equal to a set outdoor ambient low temperature threshold value; if it is determined that the outdoor ambient temperature of the air conditioning system is less than or equal to the set outdoor ambient low temperature threshold value, controlling the rotation speed of the indoor and outdoor fans to be a respective set rotation speed, the frequency of the compressor to be a set frequency, the opening degree of the first throttling device to be a set first initial opening degree, the opening degree of the second throttling device to be 0, and the opening degree of the third throttling device to be a set maximum opening degree; after a set time period, adjusting the opening degree of the first throttling device according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger; if it is determined that the outdoor ambient temperature of the air conditioning system is greater than the set outdoor ambient low temperature threshold value, controlling the rotation speed of the indoor and outdoor fans to be a respective set rotation speed, the frequency of the compressor to be a set frequency, the opening degree of the first throttling device to be a set second initial opening degree, the opening degree of the second throttling device to be 0, and the opening degree of the third throttling device to be a set maximum opening degree.

3. The control method of the air conditioning system according to claim 2, characterized by, adjusting the opening degree of the first throttling device according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, comprises: determining the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, denoted as the heating suction temperature difference of the air conditioning system; determining whether the heating suction temperature difference of the air conditioning system is greater than a set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, controlling the opening degree of the first throttling device to be opened by a set value on the basis of the current value, and then re-determining whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, controlling the opening degree of the first throttling device to maintain the current value; if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, controlling the opening degree of the first throttling device to be closed by a set value on the basis of the current value, and then re-determining whether the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value.

4. The control method of the air conditioning system according to claim 1, characterized by, the auxiliary throttling device further comprises a second capillary tube or a fourth throttling device; or the auxiliary throttling device further comprises a third capillary tube or a fifth throttling device; the second capillary tube or the fourth throttling device is arranged in a pipeline between the flash evaporator and the compressor; the third capillary tube or the fifth throttling device is arranged in a pipeline between the double-room indoor heat exchanger and the second throttling device; controlling the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device of the air conditioning system based on the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, further comprises: controlling the rotation speeds of the indoor and outdoor blowers to be respective set rotation speeds, the frequency of the compressor to be a set frequency, the opening degree of the first throttling device and the opening degree of the second throttling device to be respective set opening degrees, and the opening degree of the third throttling device to be a set maximum opening degree; after the set time period, adjusting the opening degree of the second throttling device according to the discharge temperature of the compressor; after the set time period, determining a difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, denoted as a heating suction temperature difference of the air conditioning system, and adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system; after the set time period, determining whether the discharge temperature of the compressor reaches a set discharge temperature target value and the heating suction temperature difference of the air conditioning system reaches a set heating suction target value; if yes, maintaining the current operation; if no, returning to re-determine the heating suction temperature difference of the air conditioning system.

5. The control method of the air conditioning system according to claim 4, characterized by, wherein, adjusting the opening degree of the second throttling device according to the discharge temperature of the compressor comprises: determining a size relationship between the discharge temperature of the compressor and a set first discharge temperature threshold value, a set second discharge temperature threshold value, and a set third discharge temperature threshold value; wherein the set first discharge temperature threshold value is less than the set second discharge temperature threshold value, and the set first discharge temperature threshold value is greater than the set third discharge temperature threshold value, and the set discharge temperature target value is the set third discharge temperature threshold value; if it is determined that the discharge temperature of the compressor is greater than or equal to the set first discharge temperature threshold value and less than the set second discharge temperature threshold value, increasing the opening degree of the second throttling device by a set first opening degree value based on the current value; if it is determined that the discharge temperature of the compressor is greater than or equal to the set second discharge temperature threshold value, increasing the opening degree of the second throttling device by a set second opening degree value based on the current value, the set second opening degree value being greater than the set first opening degree value; if it is determined that the discharge temperature of the compressor is less than the set third discharge temperature threshold value, restoring the current value of the opening degree of the second throttling device to the set opening degree of the second throttling device; and / or, adjusting the opening degree of the first throttling device according to the heating suction temperature difference of the air conditioning system comprises: determining whether the heating suction temperature difference of the air conditioning system is greater than a set heating suction target value; if it is determined that the heating suction temperature difference of the air conditioning system is greater than the set heating suction target value, increasing the opening degree of the first throttling device by a set value based on the current value; if it is determined that the heating suction temperature difference of the air conditioning system is equal to the set heating suction target value, maintaining the opening degree of the first throttling device at the current value; if it is determined that the heating suction temperature difference of the air conditioning system is less than the set heating suction target value, decreasing the opening degree of the first throttling device by a set value based on the current value.

6. The control method of an air conditioning system according to claim 1, wherein The speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled according to the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, including: the speed of the indoor and outdoor fans is controlled to be a respective set speed, the frequency of the compressor is controlled to be a set frequency, and the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device are controlled to be respective set opening degrees; after a set time period, the average of the tube temperature of the first indoor heat exchanger and the tube temperature of the second indoor heat exchanger is determined as a first average, the average of the first average and the outlet temperature of the outdoor heat exchanger is determined as a second average, and the difference between the second average and the temperature of the flash evaporator is determined as the temperature difference of the air conditioner system; the opening degree of the first throttling device is adjusted according to the temperature difference of the air conditioner system; after a set time period, the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger is determined as the first refrigeration suction temperature difference of the air conditioner system, and the opening degree of the second throttling device is adjusted according to the first refrigeration suction temperature difference of the air conditioner system; after a set time period, the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger is determined as the second refrigeration suction temperature difference of the air conditioner system, and the opening degree of the third throttling device is adjusted according to the second refrigeration suction temperature difference of the air conditioner system; after a set time period, it is determined whether the temperature difference of the air conditioner system reaches a set target value, the second refrigeration suction temperature difference of the air conditioner system reaches a set first refrigeration suction target value, and the second refrigeration suction temperature difference of the air conditioner system reaches a set second refrigeration suction target value; if so, the current operation is maintained; if not, the temperature difference of the air conditioner system is re-determined.

7. The control method of the air conditioning system according to claim 6, characterized by, wherein the opening degree of the first throttling device is adjusted according to the temperature difference of the air conditioner system, including: it is determined whether the temperature difference of the air conditioner system is greater than a set target value; if it is determined that the temperature difference of the air conditioner system is greater than the set target value, the opening degree of the first throttling device is controlled to be greater than the current value by a set value; if it is determined that the temperature difference of the air conditioner system is equal to the set target value, the opening degree of the first throttling device is controlled to maintain the current value; if it is determined that the temperature difference of the air conditioner system is less than the set target value, the opening degree of the first throttling device is controlled to be less than the current value by a set value; and / or the opening degree of the second throttling device is adjusted according to the first refrigeration suction temperature difference of the air conditioner system, including: it is determined whether the first refrigeration suction temperature difference of the air conditioner system is greater than a set first refrigeration suction target value; If it is determined that the first refrigeration suction temperature difference of the air conditioning system is greater than a set first refrigeration suction target value, the opening degree of the second throttling device is controlled to be increased by a set value based on the current value. If it is determined that the first refrigeration suction temperature difference of the air conditioning system is equal to a set first refrigeration suction target value, the opening degree of the second throttling device is controlled to be maintained at the current value. If it is determined that the first refrigeration suction temperature difference of the air conditioning system is less than a set first refrigeration suction target value, the opening degree of the second throttling device is controlled to be decreased by a set value based on the current value. And / or, According to the second refrigeration suction temperature difference of the air conditioning system, the opening degree of the third throttling device is adjusted, including: determining whether the second refrigeration suction temperature difference of the air conditioning system is greater than a set second refrigeration suction target value; If it is determined that the second refrigeration suction temperature difference of the air conditioning system is greater than a set second refrigeration suction target value, the opening degree of the third throttling device is controlled to be increased by a set value based on the current value. If it is determined that the second refrigeration suction temperature difference of the air conditioning system is equal to a set second refrigeration suction target value, the opening degree of the third throttling device is controlled to be maintained at the current value. If it is determined that the second refrigeration suction temperature difference of the air conditioning system is less than a set second refrigeration suction target value, the opening degree of the third throttling device is controlled to be decreased by a set value based on the current value.

8. A control device of an air conditioning system, characterized by comprising: The air conditioning system has a compressor, an outdoor heat exchanger, a double indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device, the double indoor heat exchanger includes a first indoor heat exchanger and a second indoor heat exchanger, the first throttling device is arranged on a pipeline between the flash evaporator and the outdoor heat exchanger, the second throttling device is arranged on a pipeline between the double indoor heat exchanger and the flash evaporator, the third throttling device is arranged on a pipeline on the side connected to the second indoor heat exchanger and the second throttling device, and the auxiliary throttling device is used to assist in adjusting the air charge of the compressor; the control device of the air conditioning system includes: The acquisition unit is configured to, in the case that the air conditioning system runs in a heating mode after starting, acquire the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, acquire the first suction temperature of the compressor, and acquire the pipe temperature of the outdoor heat exchanger at a set period; The control unit is configured to control the rotation speed of the indoor and outdoor fans of the air conditioning system, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger. Further comprising: The acquisition unit is further configured to, in the case that the air conditioning system runs in a cooling mode after starting, acquire the outlet temperature of the outdoor heat exchanger, acquire the pipe temperature of the first indoor heat exchanger, acquire the pipe temperature of the second indoor heat exchanger, acquire the air charge temperature of the flash evaporator, acquire the first suction temperature of the compressor, and acquire the second suction temperature of the compressor at a set period; The control unit is further configured to control the rotation speed of the indoor and outdoor fans, the frequency of the compressor, the opening degree of the first throttling device, the opening degree of the second throttling device, and the opening degree of the third throttling device of the air conditioning system in combination with the outlet temperature of the outdoor heat exchanger, the tube temperature of the first indoor heat exchanger, the tube temperature of the second indoor heat exchanger, the charge temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor.

9. An air conditioning system, characterised in that The control device of the air conditioning system according to claim 8. The storage medium comprises a stored program, wherein the program, when executed, controls the device where the storage medium is located to perform the control method of the air conditioning system according to any one of claims 1 to 7.

10. A storage medium, characterized by The computer program, when executed by a processor, implements the steps of the control method of the air conditioning system according to any one of claims 1 to 7.

11. A computer program product comprising a computer program, characterized in that, ​

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