Air conditioning system, control method and device thereof, storage medium and program product

Abstract

The invention discloses an air conditioning system and a control method and device thereof, a storage medium and a computer program product.The method comprises the steps that under the condition that the air conditioning system runs in a heating mode after being started, according to a set period, the outdoor environment temperature of the air conditioning system or the exhaust temperature of a compressor is obtained, and the first suction temperature of the compressor is obtained; the pipe temperature of the outdoor heat exchanger is obtained; and based on the outdoor environment temperature of the air conditioning system or the exhaust temperature of the compressor, according to the first air suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the rotating speed of an inner fan and an outer fan of the air conditioning system, the frequency of the compressor, the opening degree of a first throttling device, the opening degree of a second throttling device and the opening degree of a third throttling device are controlled. According to the scheme, the three throttling devices are arranged, the auxiliary throttling device is arranged, the air supply amount of the compressor is controlled, and the heating performance is improved.

Description

Technical Field

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

[0002] In the relevant scheme, in the air-conditioning system, the outdoor unit adopts a three-cylinder compressor + flash evaporator (also called "flash evaporator"), and the indoor unit adopts a dual-temperature evaporator, combined with multiple throttling devices, which can improve the system energy efficiency during refrigeration operation. However, in actual use, because the parts selection of the air-conditioning system is mainly designed for refrigeration conditions, there may be problems such as low heating capacity due to unreasonable air supply during heating operation, which leads to insufficient heating capacity.

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

[0004] The object of the present invention is to provide a control method, device, air-conditioning system, storage medium and computer program product for an air-conditioning system, so as to solve the problem that the air-supply amount of the air-supply system (such as a three-cylinder air-supply dual-temperature air-conditioning system) is unreasonable during heating operation, resulting in insufficient heating capacity, and to achieve the effect of improving the heating performance by controlling the air-supply amount of the compressor by setting three throttling devices and an auxiliary throttling device.

[0005] The present invention provides a control method for an air-conditioning system, wherein the air-conditioning system comprises a compressor, an outdoor heat exchanger, a dual indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device, wherein the dual indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, wherein the first throttling device is arranged on a pipeline between the flash evaporator and the outdoor heat exchanger, wherein the second throttling device is arranged on a pipeline between the dual indoor heat exchanger and the flash evaporator, wherein the third throttling device is arranged on a pipeline on a side where the second indoor heat exchanger is connected to the second throttling device, and wherein the auxiliary throttling device is used to assist in adjusting the compressor The control method of the air-conditioning system comprises: when the air-conditioning system is turned on and runs in a heating mode, obtaining the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor, obtaining the first suction temperature of the compressor, and obtaining the pipe temperature of the outdoor heat exchanger according to a set cycle; 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, 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.

[0006] In some embodiments, the auxiliary throttling device includes: a first capillary tube, a one-way valve and a three-way valve; 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 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; 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 internal and external 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: determining the outdoor ambient temperature of the air-conditioning system whether the ambient temperature is less than or equal to the set outdoor ambient low temperature threshold; 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, the rotation speeds of the internal and external fans are controlled to be the respective set rotation speeds, the frequency of the compressor is controlled to be the set frequency, the opening of the first throttling device is controlled to be the set first initial opening, the opening of the second throttling device is controlled to be 0, and the opening of the third throttling device is controlled to be the set maximum opening; after a set period of time, 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; if it is determined that the outdoor ambient temperature of the air-conditioning system is greater than the set outdoor ambient low temperature threshold, the rotation speeds of the internal and external fans are controlled to be the respective set rotation speeds, the frequency of the compressor is controlled to be the set frequency, the opening of the first throttling device is controlled to be the set second initial opening, the opening of the second throttling device is controlled to be 0, and the opening of the third throttling device is controlled to be the set maximum opening.

[0007] In some embodiments, the opening 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, recorded 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 of the first throttling device to increase the 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 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 of the first throttling device to decrease the 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.

[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 dual indoor heat exchanger and the second 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 pipe temperature of the outdoor heat exchanger, the speed of the internal and external 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 are controlled, and the speed of the internal and external fans is controlled to be the respective set speeds. , the frequency of the compressor is the set frequency, the openings of the first throttling device and the second throttling device are the respective set openings, and the opening of the third throttling device is the set maximum opening; after the set time, the opening of the second throttling device is adjusted according to the exhaust temperature of the compressor; after the set period, the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger is determined, which is recorded as the heating suction temperature difference of the air-conditioning system; and according to the heating suction temperature difference of the air-conditioning system, the opening of the first throttling device is adjusted; after the set period, it is determined whether the exhaust temperature of the compressor 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; if not satisfied, return to redetermine the heating suction temperature difference of the air-conditioning system.

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

[0010] In some embodiments, it also includes: when the air-conditioning system is turned on and runs in a cooling mode, according to a set cycle, obtaining the outlet temperature of the outdoor heat exchanger, obtaining the tube temperature of the first indoor heat exchanger, obtaining the tube temperature of the second indoor heat exchanger, obtaining the supply air temperature of the flash evaporator, obtaining the first suction temperature of the compressor, and obtaining the second suction temperature of the compressor; combining 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 supply air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, to control the speed of the internal and external 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.

[0011] In some embodiments, the speed of the internal and external 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 supply air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, including: controlling the speed of the internal and external fans to be the respective set speeds, the frequency of the compressor to be the set frequency, and 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 to be the respective set opening degrees; after a set period of time, 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 the first average value, determining the first average value and the average value of the outlet temperature of the outdoor heat exchanger as the second average value, and determining the difference between the second average value and the supply air temperature of the flash evaporator as the air conditioning system the supplementary air temperature difference of the air conditioning system; according to the supplementary air temperature difference of the air conditioning system, adjusting the opening of the first throttling device; after a set period of time, determining the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger, recorded as the first refrigeration suction air temperature difference of the air conditioning system; and according to the first refrigeration suction air temperature difference of the air conditioning system, adjusting the opening of the second throttling device; after a set period of time, determining the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger, recorded as the second refrigeration suction air temperature difference of the air conditioning system; and according to the second refrigeration suction air temperature difference of the air conditioning system, adjusting the opening of the third throttling device; after a set period of time, determining whether the supplementary air temperature difference of the air conditioning system reaches the set supplementary air target value, the second refrigeration suction air temperature difference of the air conditioning system reaches the set first refrigeration suction air target value, and the second refrigeration suction air temperature difference of the air conditioning system reaches the set second refrigeration suction air target value: if satisfied, maintain the current operation; if not satisfied, return to redetermine as the supplementary air temperature difference of the air conditioning system.

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

[0013] Matching the above method, the present invention provides a control device for an air-conditioning system on the other hand, the air-conditioning system comprises a compressor, an outdoor heat exchanger, a dual indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device, the dual indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, the first throttling device is arranged on the pipeline between the flash evaporator and the outdoor heat exchanger, the second throttling device is arranged on the pipeline between the dual indoor heat exchanger and the flash evaporator, the third throttling device is arranged on the pipeline on the side where the second indoor heat exchanger is connected to the second throttling device, and the auxiliary throttling device is used to assist in adjusting the air supply of the compressor The control device of the air-conditioning system comprises: an acquisition unit, which is configured to acquire the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor, the first suction temperature of the compressor, and the pipe temperature of the outdoor heat exchanger according to a set period when the air-conditioning system runs a heating mode after being turned on; a control unit, which is configured to control the rotation 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 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.

[0014] In some embodiments, the auxiliary throttling device includes: a first capillary tube, a one-way valve and a three-way valve; 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 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; the control unit controls the speed of the internal and external 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 exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, including: determining the air-conditioning system Whether the outdoor ambient temperature is less than or equal to the set outdoor ambient low temperature threshold; 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, the speed of the internal and external fans is controlled to be the respective set speeds, the frequency of the compressor is the set frequency, the opening of the first throttling device is the set first initial opening, the opening of the second throttling device is 0, and the opening of the third throttling device is the set maximum opening; after a set period of time, 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; if it is determined that the outdoor ambient temperature of the air-conditioning system is greater than the set outdoor ambient low temperature threshold, the speed of the internal and external fans is controlled to be the respective set speeds, the frequency of the compressor is the set frequency, the opening of the first throttling device is the set second initial opening, the opening of the second throttling device is 0, and the opening of the third throttling device is the set maximum opening.

[0015] In some embodiments, the control unit adjusts the opening 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, recorded 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 of the first throttling device to increase the 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 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 of the first throttling device to decrease the 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.

[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 dual indoor heat exchanger and the second throttling device; the control unit controls the speed of the internal and external 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 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, and also includes: controlling the speed of the internal and external fans to be the respective setting The speed is fixed, the frequency of the compressor is the set frequency, the opening of the first throttling device and the opening of the second throttling device are the respective set openings, and the opening of the third throttling device is the set maximum opening; after the set time, the opening of the second throttling device is adjusted according to the exhaust temperature of the compressor; after the set period of time, the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger is determined, which is recorded as the heating suction temperature difference of the air-conditioning system; and according to the heating suction temperature difference of the air-conditioning system, the opening of the first throttling device is adjusted; after the set period of time, it is determined whether the exhaust temperature of the compressor 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; if not satisfied, return to redetermine the heating suction temperature difference of the air-conditioning system.

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

[0018] In some embodiments, it also includes: the acquisition unit is also configured to acquire 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 supply air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor according to a set cycle when the air-conditioning system runs a cooling mode after being turned on; the control unit is also configured to control the speed of the internal and external 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 supply air 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 controls the speed of the internal and external 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 supply air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, including: controlling the speed of the internal and external fans to be the respective set speeds, the frequency of the compressor to be the set frequency, and controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device to be the respective set openings; after a set period of time, 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 the first average value, determining the first average value and the average value of the outlet temperature of the outdoor heat exchanger as the second average value, and determining the difference between the second average value and the supply air temperature of the flash evaporator as the the make-up air temperature difference of the air-conditioning system; according to the make-up air temperature difference of the air-conditioning system, adjusting the opening of the first throttling device; after a set period of time, determining the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger, recorded as the first refrigeration suction air temperature difference of the air-conditioning system; and according to the first refrigeration suction air temperature difference of the air-conditioning system, adjusting the opening of the second throttling device; after a set period of time, determining the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger, recorded as the second refrigeration suction air temperature difference of the air-conditioning system; and according to the second refrigeration suction air temperature difference of the air-conditioning system, adjusting the opening of the third throttling device; after a set period of time, determining whether the make-up air temperature difference of the air-conditioning system reaches the set make-up air target value, the second refrigeration suction air temperature difference of the air-conditioning system reaches the set first refrigeration suction air target value, and the second refrigeration suction air temperature difference of the air-conditioning system reaches the set second refrigeration suction air target value: if satisfied, maintain the current operation; if not satisfied, return to redetermine as the make-up air temperature difference of the air-conditioning system.

[0020] In some embodiments, wherein the control unit adjusts the opening of the first throttling device according to the supplementary air temperature difference of the air-conditioning system, including: determining whether the supplementary air temperature difference of the air-conditioning system is greater than the set supplementary air target value; if it is determined that the supplementary air temperature difference of the air-conditioning system is greater than the set supplementary air target value, controlling the opening of the first throttling device to increase the set value on the basis of the current value; if it is determined that the supplementary air temperature difference of the air-conditioning system is equal to the set supplementary air target value, controlling the opening of the first throttling device to maintain the current value; if it is determined that the supplementary air temperature difference of the air-conditioning system is less than the set supplementary air target value, controlling the opening of the first throttling device to decrease the set value on the basis of the current value; and / or, the control unit adjusts the opening of the second throttling device according to the first refrigeration suction air temperature difference of the air-conditioning system, including: determining whether the first refrigeration suction air temperature difference of the air-conditioning system is greater than the set first refrigeration suction air target value; if it is determined that the first refrigeration suction air temperature difference of the air-conditioning system is greater than the set first refrigeration suction air target value, controlling the opening of the second throttling device to increase the set value on the basis of the current value; If it is determined that the first refrigeration suction air temperature difference of the air-conditioning system is equal to the set first refrigeration suction air target value, the opening of the second throttling device is controlled to maintain the current value; if it is determined that the first refrigeration suction air temperature difference of the air-conditioning system is less than the set first refrigeration suction air target value, the opening of the second throttling device is controlled to be closed by the set value on the basis of the current value; and / or, the control unit adjusts the opening of the third throttling device according to the second refrigeration suction air temperature difference of the air-conditioning system, including: determining whether the second refrigeration suction air temperature difference of the air-conditioning system is greater than the set second refrigeration suction air target value; if it is determined that the second refrigeration suction air temperature difference of the air-conditioning system is greater than the set second refrigeration suction air target value, the opening of the third throttling device is controlled to be opened by the set value on the basis of the current value; if it is determined that the second refrigeration suction air temperature difference of the air-conditioning system is equal to the set second refrigeration suction air target value, the opening of the third throttling device is controlled to maintain the current value; if it is determined that the second refrigeration suction air temperature difference of the air-conditioning system is less than the set second refrigeration suction air target value, the opening of the third throttling device is controlled to be closed by the set value on the basis of the current value.

[0021] Matching the above device, the present invention provides an air-conditioning system on another aspect, including: the control device of the air-conditioning system described above.

[0022] In accordance with the above method, the present invention provides a storage medium on the other hand, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the above-mentioned air-conditioning system control method.

[0023] In accordance with the above method, the present invention provides a computer program product on another aspect, including a computer program, which implements the steps of the above-mentioned air-conditioning system control method when executed by a processor.

[0024] Therefore, the scheme of the present invention sets three throttling devices (such as valve A, valve B and valve C) for a three-cylinder air-supply dual-temperature air-conditioning system (i.e., an air-conditioning system with a three-cylinder compressor, a dual-room indoor heat exchanger and a flash evaporator), valve A is set in the pipeline between the flash evaporator and the indoor heat exchanger, valve B is set in the pipeline between the dual indoor heat exchanger and the flash evaporator, and valve C is set in the pipeline where the indoor heat exchanger 2 in the dual indoor heat exchanger is located (specifically, valve C is set in the pipeline between the indoor heat exchanger 2 and valve B in the dual indoor heat exchanger); for the control strategy of the valve opening of the throttling device, three control modes are set: the first is to set a three-way valve, a capillary tube and a one-way valve, the three-way valve is connected to the outdoor heat exchanger, valve A and the one-way valve respectively, and the capillary tube and the one-way valve can bypass the pipeline where valve A, flash evaporator and valve B are located The second method is to set a capillary tube, which is set in the pipeline between the flash evaporator and the compressor; the third method is to set a capillary tube, which is set in the pipeline between the double indoor heat exchanger and the B valve; in the cooling mode, the control is based on the make-up air temperature Tmake-up of the flash evaporator, the high and low temperature suction superheat of the compressor and the exhaust superheat of the compressor; in the heating mode, in the first control mode, the control is based on the suction superheat 1 of the compressor; in the second control mode and the third control mode, the control is based on the exhaust superheat and suction superheat 1 of the compressor, which can realize throttling control under different conditions; thus, by setting three throttling devices and setting auxiliary throttling devices (specifically setting capillaries in different ways), the make-up air amount of the compressor is controlled and the heating performance is improved.

[0025] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic flow chart of an embodiment of a method for controlling an air conditioning system of the present invention;

[0028] Figure 2 A flow chart of an embodiment of a first process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in a heating mode in the method of the present invention;

[0029] Figure 3It is a flow chart of an embodiment of adjusting the opening 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 in the method of the present invention;

[0030] Figure 4 A flow chart of an embodiment of a second process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in a heating mode in the method of the present invention;

[0031] Figure 5 It is a flow chart of an embodiment of adjusting the opening of the second throttling device according to the exhaust temperature of the compressor in the heating mode in the method of the present invention;

[0032] Figure 6 It is a flow chart of an embodiment of adjusting the opening of the first throttling device according to the heating and suction temperature difference of the air-conditioning system in the heating mode of the method of the present invention;

[0033] Figure 7 A schematic diagram of a flow chart of an embodiment of controlling the operation of the air-conditioning system during a refrigeration process in the method of the present invention;

[0034] Figure 8 A flow chart of an embodiment of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device during a refrigeration process in the method of the present invention;

[0035] Fig. 9 It is a flow chart of an embodiment of adjusting the opening of the first throttling device according to the supplementary air temperature difference of the air conditioning system in the cooling mode of the method of the present invention;

[0036] Fig.10 It is a flow chart of an embodiment of adjusting the opening of the second throttling device according to the first refrigeration suction temperature difference of the air-conditioning system in the refrigeration mode of the method of the present invention;

[0037] Fig.11 It is a flow chart of an embodiment of adjusting the opening degree of the third throttling device according to the second refrigeration suction temperature difference of the air-conditioning system in the refrigeration mode of the method of the present invention;

[0038] Fig.12 A schematic structural diagram of an embodiment of a control device for an air conditioning system of the present invention;

[0039] Fig.13 Schematic diagram of the structure of the first embodiment of the air-conditioning system, wherein (a) is a schematic diagram of the structure of the air-conditioning system in the heating mode, and (b) is a schematic diagram of the structure of the air-conditioning system in the cooling mode;

[0040] Fig.14 For Fig.13 The schematic diagram of the valve opening control process of the air conditioning system shown;

[0041] Fig.15 is a schematic diagram of the structure of a second embodiment of an air-conditioning system, specifically a schematic diagram of the structure of the air-conditioning system in a heating mode;

[0042] Fig.16 is a schematic diagram of the structure of a third embodiment of an air-conditioning system, specifically a schematic diagram of the structure of the air-conditioning system in a heating mode;

[0043] Fig.17 for Fig.15 and Fig.16 The figure shows a schematic diagram of the valve opening control process of the air-conditioning system in the heating mode.

[0044] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

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

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] It is taken into consideration that an air-conditioning system (such as a three-cylinder air-supplement dual-temperature air-conditioning system) may have problems such as low heating capacity due to unreasonable air supply during heating operation. For example, a large air supply may lead to low exhaust temperature, which in turn leads to insufficient heating capacity. The control methods for heat pump air-conditioning systems with three-cylinder compressors provided by some schemes focus on the selection of throttling mechanisms for refrigeration operation. There may be situations where they are not suitable for heating operation, and the air supply may carry liquid, resulting in low or insufficient heating capacity. Therefore, the scheme of the present invention proposes a control method for an air-conditioning system, specifically a control method for a three-cylinder air-supplement dual-temperature air-conditioning system, which adopts a bypass throttling device + a one-way valve scheme during heating operation to solve the problem of insufficient heating capacity of the three-cylinder air-supplement dual-temperature air-conditioning system.

[0048] According to an embodiment of the present invention, a control method for an air conditioning system is provided. Figure 1The flowchart of an embodiment of the method of the present invention is shown in the figure. The air conditioning system is a three-cylinder air-injection dual-temperature air conditioning system, and the three-cylinder air-injection dual-temperature air conditioning system has a compressor, an outdoor heat exchanger, a dual indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device. The dual indoor heat exchanger includes a first indoor heat exchanger and a second indoor heat exchanger. The first throttling device is arranged on the pipeline between the flash evaporator and the outdoor heat exchanger, the second throttling device is arranged on the pipeline between the dual indoor heat exchanger and the flash evaporator, and the third throttling device is arranged on the pipeline on the side where the second indoor heat exchanger is connected to the second throttling device (specifically, the third throttling device is arranged on the pipeline between the second indoor heat exchanger and the second throttling device, and is not on the pipeline between the first indoor heat exchanger and the second throttling device). The auxiliary throttling device is arranged in the air supply pipeline of the compressor, and the auxiliary throttling device is used to assist in adjusting the air supply amount of the compressor. The compressor is a three-cylinder compressor. The first indoor heat exchanger is as follows: Fig.13 (a) Fig.15 and Fig.16 Condenser 1, Fig.13 (b) the evaporator 1, the second indoor heat exchanger such as Fig.13 (a) Fig.15 and Fig.16 Condenser 2, Fig.13 (b) evaporator 2, outdoor heat exchanger such as Fig.13 (a) Fig.15 and Fig.16 The evaporator in Fig.13 (b) In the condenser, the first throttling device is such as valve A, the second throttling device is such as valve B, the third throttling device is such as valve C, and the auxiliary throttling device is such as valve Fig.13 Capillaries and one-way valves in Fig.15 The capillaries in Fig.16 In the embodiment of the present invention, Figure 1 As shown, the control method of the air-conditioning system includes: step S110 to step S120.

[0049] At step S110, when the air-conditioning system is turned on and runs in heating mode, the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor (such as the exhaust temperature of the compressor, Texhaust) is obtained according to a set cycle, the first suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor, Tsuction1) is obtained, and the pipe temperature of the outdoor heat exchanger (such as the outdoor heat exchanger pipe temperature, Texternal pipe) is obtained; wherein the set cycle is such as time t2, and the range of time t2 is 60 seconds to 120 seconds.

[0050] At step S120, in the heating mode, based on the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor, and in accordance with the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the internal and external 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 are controlled to adjust the air supply volume of the compressor so that the heating capacity of the air-conditioning system is within the set heating capacity range.

[0051] According to the solution of the present invention, in the three-cylinder air-injection dual-temperature air-conditioning system, an auxiliary throttling device is adopted during the heating operation, such as a bypass throttling device (such as a capillary tube) and selectively combined with a one-way valve, so as to solve the problem of low heating capacity caused by unreasonable air supply volume, improve the heating effect of the system, and thus solve the problem of insufficient heating capacity of the three-cylinder air-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 Fig.13 The capillary tube shown; a bypass pipeline is arranged 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 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.

[0053] Fig.13 Schematic diagram of the structure of the first embodiment of the air conditioning system, wherein (a) is a schematic diagram of the structure of the air conditioning system in the heating mode, and (b) is a schematic diagram of the structure of the air conditioning system in the cooling mode. Fig.13The 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 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 heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode), a one-way valve and a capillary tube. Among them, 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 air intake port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first air intake port of the compressor. The fourth valve port of the four-way valve component 1 is divided into two paths after passing through the indoor heat exchanger 2 and the C valve: one path is connected to the first port of the flash evaporator after passing through the B valve, and the other path is connected to the second valve port of the three-way valve after passing 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 after passing through the outdoor heat exchanger. The third valve port of the three-way valve is connected to the second port of the flash evaporator after passing through valve A, and the third port of the flash evaporator is connected to the third air intake port of the compressor. The fourth valve port of the four-way valve component 2 is connected 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, that is, the allowed flow direction of the one-way valve is from the capillary tube to the second valve port of the three-way valve.

[0054] like Fig.13 As shown, in the scheme of the present invention, the outdoor unit of the air-conditioning system adopts a three-cylinder compressor + flash evaporator, the indoor unit adopts a dual-temperature evaporator, and multiple throttling devices are set. In addition to the capillary connected to the one-way valve, the air-conditioning system in the scheme of the present invention also adopts three throttling devices (A valve, B valve, C valve), preferably an electronic expansion valve, and a programmable thermal expansion valve can also be used. The outlet of the outdoor unit heat exchanger is a three-way structure, one way is connected to the one-way valve + capillary tube, and the other way is connected to the throttling device A valve. When heating, close the B valve, and the refrigerant comes out of the indoor heat exchanger through the capillary tube and the one-way valve, and enters the outdoor heat exchanger and the flash evaporator respectively, so as to adjust the air supply volume and improve the heating performance. When cooling, the refrigerant enters the A valve from the outdoor heat exchanger and then enters the flash evaporator.

[0055] In step S120, in the heating mode, based on the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor, and in accordance with the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the internal and external 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 are controlled, including: a first process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in the heating mode.

[0056] Combine the following Figure 2The flowchart of an embodiment of the first process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in the heating mode in the method of the present invention further illustrates the specific process of the first process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in the heating mode in step S120, including: steps S210 to S230.

[0057] Step S210, in the heating mode, determines 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, such as the set T outer ring low temperature, the T outer ring low temperature range is -5°C to 2°C.

[0058] Step S220, in the heating mode, 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, the speed of the internal and external fans is controlled to be the respective set speeds, the frequency of the compressor is the set frequency, the opening of the first throttling device is the set first initial opening, the opening of the second throttling device is 0, and the opening of the third throttling device is the set maximum opening; after the set time, 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; wherein the set time is such as t1 time, and the range of time t1 is 3 to 10 minutes. The set first initial opening is the initial opening 1 of valve A. The range of initial opening 1 of valve A is 50B to 100B.

[0059] Step S230, in the 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, the speed of the internal and external fans is controlled to be the respective set speeds, the frequency of the compressor is controlled to be the set frequency, the opening of the first throttling device is controlled to be the set second initial opening, the opening of the second throttling device is controlled to be 0, and the opening of the third throttling device is controlled to be the set maximum opening. The set second initial opening is the initial opening 2 of the A valve. The range of the initial opening 2 of the A valve is 150B to 300B.

[0060] Fig.14 For Fig.13 The schematic diagram of the valve opening control process of the air conditioning system is shown in FIG. Fig.14As shown, in the solution of the present invention, the air conditioning system uses the air supply temperature, the suction superheat, the exhaust superheat, etc. to control the throttling device. In the scheme of the present invention, the air-conditioning system includes multiple temperature sensing bags. In addition to the environmental temperature sensing bag for detecting the indoor ambient temperature Tinner loop, the indoor unit also has two evaporator tube temperature sensing bags for detecting the tube temperatures of the two indoor heat exchangers, such as the tube temperatures Tinner tube 1 and Tinner tube 2 of the two evaporators in the cooling mode, while the air-conditioning system in the related scheme has only one inner tube temperature sensing bag; in addition to the environmental temperature sensing bag for detecting the outdoor ambient temperature Touter loop, the exhaust temperature sensing bag for detecting the exhaust temperature Texhaust of the compressor, and the tube temperature sensing bag of the outdoor heat exchanger (such as the condenser tube temperature sensing bag in the cooling mode) for detecting the outdoor heat exchanger tube temperature Touter tube, the outdoor unit is also equipped with an air supply temperature sensing bag located at the flash evaporator outlet (the third port of the flash evaporator, i.e., the port connected to the flash evaporator and the compressor) for detecting the air supply temperature Tsupply of the flash evaporator, a condenser outlet temperature sensing bag for detecting the outlet temperature Tcoldout of the outdoor heat exchanger, and two suction temperature sensing bags for detecting the suction temperature Tsupply1 and Tsupply2 of the compressor. The temperatures here are all actual detection values ​​of the temperature sensing package. The initial operating frequency of the compressor when starting up needs to be determined based on the temperature difference between the T inner loop and the user set temperature, and the T outer loop. The control logic of the air conditioning system in the relevant scheme can be used, and it will not be described in detail in the scheme of the present invention. Fig.14 As shown in FIG. 1 , the control strategy of the throttling device during heating is based on the suction superheat of the compressor. Fig.14 As shown, Fig.13 The control strategy of the throttling device of the air conditioning system shown in the figure during heating includes:

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

[0062] Step 22, determine whether the outdoor environment temperature Touter ring ≤ the set Touter ring low temperature: if not, execute step 23; if yes, execute step 24. The set Touter ring low temperature is the low temperature range of Touter ring, and the low temperature range of Touter ring is -5℃~2℃.

[0063] Step 23, if the outdoor ambient temperature Touter ring ≤ the set Touter ring low temperature is not satisfied, the program will be based on the internal and external fan speeds, compressor operating frequency and the initial opening of the valve (the initial opening of valve A is 2, valve B is closed, and valve C is at the maximum opening), and the system will be operated until shutdown or the indoor and outdoor temperature setting parameters change; if the indoor and outdoor temperature setting parameters change, the system will return to step 21. The range of the initial opening 2 of valve A is 150B to 300B.

[0064] Step 24: If Touter ring ≤ the set Touter ring low temperature, the program will be run for t1 time according to the internal and external fan speeds, compressor operating frequency and initial valve opening (initial opening 1 of valve A, valve B closed, valve C at maximum opening), and then step 25 will be executed. The initial opening 1 of valve A ranges from 50B to 100B.

[0065] In the scheme of the present invention, a capillary tube and a one-way valve are added, and their function is to control the air supply volume of the air conditioning system during heating operation to prevent excessive air supply volume, resulting in air supply with liquid, and reducing the heating capacity; if there is no capillary tube and one-way valve, the refrigerant will enter the flash evaporator through the B valve, and then the liquid refrigerant will enter the evaporator through the A valve, and the gas refrigerant will enter the flash evaporator, and the air supply volume cannot be well controlled. The scheme of the present invention proposes a system and a control scheme for improving the heating capacity of a three-cylinder air-supplement dual-temperature air conditioning system, and the air conditioning system includes but is not limited to wall-mounted units, cabinet units, multi-split units, etc. In the three-cylinder air-supplement dual-temperature air conditioning system in the related scheme, the refrigerant enters the flash evaporator through the B valve after coming out of the indoor heat exchanger, and then a part enters the third air intake 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 when the opening is relatively small, the opening of the B valve can only take a larger value. In this case, the air supply volume entering the flash evaporator will be too large, resulting in air supply with liquid, low exhaust temperature, poor heating capacity, and even unstable system operation.

[0066] In the scheme of the present invention, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (valve A) and a throttling device (valve B) in series, and the outlet of the outdoor unit heat exchanger is a three-way structure, one way is connected to the check valve + capillary tube, and the other way is connected to the throttling device valve A. When heating, the valve B is closed, and the refrigerant comes out of the indoor heat exchanger through the capillary tube and the check valve, and enters the outdoor heat exchanger and the flash evaporator respectively. The refrigerant vapor separated in the flash evaporator enters the third air intake port of the compressor, so as to adjust the air supply amount and improve the heating performance. Fig.13 Middle (a) figure.

[0067] In the scheme of the present invention, based on the auxiliary throttling device composed of the first capillary tube and the one-way valve, in the 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 tube temperature of the outdoor heat exchanger, the rotation speed of the internal and external 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 are controlled, so that the air supply volume can be adjusted to improve the heating performance. Among them, if the air supply volume is too large during heating operation, it may cause the air supply to carry liquid, thereby reducing the heating capacity; therefore, in the scheme of the present invention, the one-way valve + capillary tube structure is adopted, which becomes the main throttling device during heating, and the refrigerant flow rate can be controlled to be small. In addition to the control of the first throttling device, the downstream air supply volume is also small; if there is no one-way valve + capillary tube structure, the second throttling device becomes the main throttling device, and there will be a large noise when controlling a small flow rate.

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

[0069] Combine the following Figure 3 The flowchart of an embodiment of the method of the present invention for adjusting the opening 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 is shown, further illustrating the specific process of adjusting the opening 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 in step S220, including: steps S310 to S350.

[0070] Step S310, in the heating mode, determining the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, and recording it as the heating suction temperature difference of the air conditioning system (such as ΔTsuction1).

[0071] Step S320, in the heating mode, determining whether the heating air intake temperature difference of the air conditioning system is greater than a set heating air intake target value; wherein the set heating air intake target value is, for example, a target value of ΔT intake 1. The range of the target value of ΔT intake 1 is 3°C to 5°C.

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

[0073] Step S340, in the heating mode, if it is determined that the heating intake temperature difference of the air-conditioning system is equal to the set heating intake target value, the opening of the first throttling device is controlled to maintain the current value, and then the speeds of the internal and external fans are controlled to be the respective set speeds, the frequency of the compressor is controlled to be the set frequency, the opening of the first throttling device is controlled to be the current value, the opening of the second throttling device is controlled to be 0, and the opening of the third throttling device is controlled to be the set maximum opening to continue operation.

[0074] Step S350, in the heating mode, if it is determined that the heating intake temperature difference of the air-conditioning system is less than the set heating intake target value, the opening 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 intake temperature difference of the air-conditioning system is greater than the set heating intake target value.

[0075] Specifically, Fig.14 As shown, Fig.13 The control strategy of the throttling device of the air conditioning system shown in the figure during heating also includes:

[0076] Step 25, after running for t1 time, calculate ΔTsuction1=Tsuction1-Texternal pipe, when ΔTsuction1 is greater than the target value, increase the opening of valve A, when ΔTsuction1 is less than the target value, decrease the opening of valve A, and then execute step 26. Tsuction1 is the suction temperature of the first suction port of the compressor, and Texternal pipe is the pipe temperature of the outdoor heat exchanger. The opening range of valve A, valve B, and valve C is 0B~500B, and the opening range is 10B~20B each time.

[0077] Step 26, after running for t3 time, determine whether ΔT suction 1 reaches the target value: if it does not reach the target value, continue to adjust the opening of valve A according to ΔT suction 1; if it reaches the target value, run at this frequency opening until it is shut down or the indoor and outdoor temperature setting parameters change. If the indoor and outdoor temperature setting parameters change, return to step 21.

[0078] In the solution of the present invention, based on the auxiliary throttling device composed of the first capillary tube and the one-way valve, in the heating mode, according to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, the opening of the first throttling device is adjusted to adjust the air supply amount and improve the heating performance. Here, the first throttling device controls the air supply amount 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, the second capillary tube as Fig.15 The capillary in the third capillary is Fig.16The capillary tube in the second chamber; the second capillary tube or the fourth throttling device is arranged in the pipeline between the flash evaporator and the compressor, specifically, in the pipeline between the flash evaporator and the third air intake port of the compressor; the third capillary tube or the fifth throttling device is arranged in the pipeline between the dual indoor heat exchanger and the second throttling device.

[0080] Fig.15 It is a structural diagram of a second embodiment of an air-conditioning system, specifically, it is a structural diagram of the air-conditioning system in a heating mode. Fig.15 This is a second system diagram that is beneficial to improving heating performance. A capillary tube (or electronic expansion valve) is connected between the flash evaporator outlet and the compressor inlet to control the air supply volume. Fig.15 The 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 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 heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode) and a capillary tube. Among them, 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 air intake port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first air intake 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 air inlet of the compressor through a 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.

[0081] Fig.16 It is a structural diagram of a third embodiment of an air-conditioning system, specifically, it is a structural diagram of the air-conditioning system in a heating mode. Fig.16 The third system diagram is helpful to improve the heating performance, where a capillary tube (or electronic expansion valve) is connected in series before valve B. Fig.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 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 heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode) and a capillary tube. Among them, 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 air intake port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first air intake 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 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 after passing through the A valve and the indoor heat exchanger. The third port of the flash evaporator is connected to the third air intake 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 after passing through the indoor heat exchanger 1.

[0082] in, Fig.15 and Fig.16 The main purpose is to control the amount of gas entering the flash evaporator to prevent excessive gas supply, which will cause gas to carry liquid and reduce heating capacity.

[0083] In step S120, in the heating mode, based on the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor, and in accordance with the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the internal and external 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 are controlled. It also includes: a second process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in the heating mode.

[0084] Combine the following Figure 4 The flowchart of an embodiment of the second process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in the heating mode in the method of the present invention further illustrates the specific process of the second process of controlling the opening of the first throttling device, the opening of the second throttling device, and the opening of the third throttling device in the heating mode in step S120, including: steps S410 to S440.

[0085] Step S410, in the heating mode, the speeds of the internal and external fans are controlled to be the respective set speeds, the frequency of the compressor is controlled to be the set frequency, the openings of the first throttling device and the second throttling device are controlled to be the respective set openings, and the opening of the third throttling device is controlled to be the set maximum opening. The set speed, set frequency and set opening are all set values ​​built into the program. Fig.17 for Fig.15 and Fig.16 The figure shows the valve opening control flow diagram of the air conditioning system in heating mode. Fig.15 and Fig.16 In the example shown, the valve opening control mode in cooling mode remains unchanged, but the operating parameters will be different due to the different positions of the serial capillary tubes. Fig.17 As shown in FIG. 1 , the valve opening control strategy in the heating mode is controlled based on the exhaust superheat and suction superheat of the compressor. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air-conditioning system in the heating mode shown includes: step 31, judging the operating mode after starting up, if it is the heating mode, collecting the indoor and outdoor ambient temperature, set temperature, set wind speed, and setting the internal and external fan speeds, compressor operating frequency and initial valve opening according to the program (C valve always maintains the maximum opening in the heating mode), running for t1 time, and then executing step 32.

[0086] Step S420, in the heating mode, after a set time, adjust the opening of the second throttling device according to the exhaust temperature of the compressor; wherein the set time is such as t1 time. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air-conditioning system in the heating mode shown also includes: step 32, collecting temperature sensing package data according to period t2, adjusting the opening of valve B according to the exhaust temperature T exhaust of the compressor, and then executing step 33.

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

[0088] Combine the following Figure 5 The flowchart of an embodiment of adjusting the opening of the second throttling device according to the exhaust temperature of the compressor in the heating mode in the method of the present invention further illustrates the specific process of adjusting the opening of the second throttling device according to the exhaust temperature of the compressor in the heating mode in step S420, including: steps S510 to S540.

[0089] Step S510, in the heating mode, determines the relationship between the exhaust temperature of the compressor 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 TExhaust_B1 target value, the set second exhaust temperature threshold is such as the TExhaust_B2 target value, and the set third exhaust temperature threshold is such as the TExhaust_B3 target value. The target value of TExhaust is specifically the TExhaust_B3 target value.

[0090] Step S520, in the 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, 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 KExhaust_B1.

[0091] Step S530, in the 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 KExhaust_B2.

[0092] Step S540: In the heating mode, if it is determined that the exhaust temperature of the compressor is lower than a 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 Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air conditioning system in the heating mode shown in the figure also includes: in step 32, adjusting the opening of the B valve according to the exhaust temperature T exhaust of the compressor, specifically including:

[0094] ① When the exhaust temperature of the compressor is Texhaust ≥ Texhaust_B1, the B valve increases Kexhaust_B1 according to the current opening;

[0095] ② When the exhaust temperature of the compressor is Texhaust ≥ Texhaust_B2, the B valve increases Kexhaust_B2 according to the current opening;

[0096] ③When the exhaust temperature of the compressor is Texhaust < Texhaust_B3, valve B resumes operation at the reference opening.

[0097] Among them, the target value range of T EXHAUST_B1 is (88℃~92℃), and the range of K EXHAUST_B1 is (4B~6B); the target value range of T EXHAUST_B2 is (93℃~97℃), and the range of K EXHAUST_B2 is (8B~10B); the target value range of T EXHAUST_B3 is (75℃~85℃).

[0098] In the solution of the present invention, based on the auxiliary throttling device composed of the second capillary tube or the third capillary tube, in the heating mode, the opening of the second throttling device is adjusted according to the exhaust temperature of the compressor, so that the air supply amount can be adjusted to improve the heating performance. Among them, the second capillary tube directly controls the air supply amount, and the third capillary tube controls the refrigerant flow entering the second throttling device, both of which can achieve the purpose of reducing the air supply amount entering the flash evaporator.

[0099] Step S430, in the heating mode, after a set period of time, determine the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, which is recorded as the heating suction temperature difference of the air conditioning system (such as ΔT suction 1 in the heating mode); and adjust the opening of the first throttling device according to the heating suction temperature difference of the air conditioning system; wherein the set period of time is such as time t3, and the range of time t3 is 120 to 180 seconds. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air-conditioning system in the heating mode shown also includes: step 33, adjusting the opening of valve A according to ΔTsuction 1, and then executing step 34.

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

[0101] Combine the following Figure 6 The flowchart of an embodiment of adjusting the opening 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 present invention further illustrates the specific process of adjusting the opening of the first throttling device according to the heating suction temperature difference of the air-conditioning system in the heating mode in step S430, including: step S610 to step S640.

[0102] Step S610, in the heating mode, determining whether the heating air intake temperature difference of the air conditioning system is greater than a set heating air intake target value; wherein the set heating air intake target value is, for example, a target value of ΔT intake 1. The range of the target value of ΔT intake 1 is 3°C to 5°C.

[0103] Step S620, in the heating mode, if it is determined that the heating intake air temperature difference of the air-conditioning system is greater than the set heating intake air target value, the opening of the first throttling device is controlled to increase by a set value based on 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 intake air temperature difference of the air-conditioning system reaches the set heating intake air target value.

[0104] Step S630, in the heating mode, if it is determined that the heating intake air temperature difference of the air-conditioning system is equal to the set heating intake air target value, the opening degree 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 intake air temperature difference of the air-conditioning system reaches the set heating intake air target value.

[0105] Step S640, in the heating mode, if it is determined that the heating intake air temperature difference of the air-conditioning system is less than the set heating intake air target value, the opening of the first throttling device is controlled to be closed to a set value based on 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 intake air temperature difference of the air-conditioning system reaches the set heating intake air target value.

[0106] like Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air conditioning system in the heating mode shown in the figure also includes: in step 33, after the opening of the B valve is adjusted according to the exhaust temperature Texhaust of the compressor for t3 time, ΔTsuction1=Tsuction1-Texternal pipe is calculated, and when ΔTsuction1 is greater than the target value, the opening of the A valve is increased, and when ΔTsuction1 is less than the target value, the opening of the A valve is decreased, and then step 34 is executed. The opening ranges of the A valve, the B valve, and the C valve are all 0B to 500B, and the opening range of each adjustment is 10B to 20B.

[0107] In the scheme of the present invention, based on the auxiliary throttling device composed of the second capillary or the third capillary, in the heating mode, the opening of the first throttling device is adjusted according to the heating intake temperature difference of the air-conditioning system, so as to adjust the air supply amount and improve the heating performance.

[0108] Step S440, in the heating mode, after a set period of time, determine whether the exhaust temperature of the compressor reaches the set exhaust temperature target value, and the heating intake air temperature difference of the air conditioning system reaches the set heating intake air target value: if satisfied, maintain the current operation, that is, control the speed of the internal and external fans to their respective set speeds, the frequency of the compressor to the set frequency, the opening of the first throttling device to the current value, the opening of the second throttling device to the current value, and the opening of the third throttling device to the set maximum opening and continue to operate; if not satisfied, return to redetermine the heating intake air temperature difference of the air conditioning system, and re-adjust the opening of the first throttling device according to the heating intake air temperature difference of the air conditioning system. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air conditioning system in the heating mode shown in the figure also includes: step 34, after running for t3 time, judging whether T exhaust and ΔT suction 1 have reached the target value: if the target value has not been reached, the opening of the corresponding throttling device is adjusted continuously according to T exhaust and ΔT suction 1; if the target value has been reached, the system is operated at this frequency opening until the system is shut down or the indoor and outdoor temperature setting parameters change. When the indoor and outdoor temperature setting parameters change, the opening of the corresponding throttling device is adjusted continuously according to T exhaust and ΔT suction 1.

[0109] In the scheme of the present invention, based on the auxiliary throttling device composed of the second capillary tube or the third capillary tube, in the heating mode, based on 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 speed of the internal and external 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 are controlled, so that the air supply volume can be adjusted to improve the heating performance. Among them, suitable exhaust temperature and suction superheat are conducive to the system to perform better performance. When heating, the second throttling device is the main throttling to adjust the exhaust temperature, and the first throttling device is used to control the suction superheat. When heating, the indoor heat exchanger does not need dual temperature, so the third throttling device is always opened to the maximum when heating.

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

[0111] Combine the following Figure 7 The flowchart of an embodiment of controlling the operation of the air-conditioning system during the refrigeration process in the method of the present invention further illustrates the specific process of controlling the operation of the air-conditioning system during the refrigeration process, including: step S710 to step S720.

[0112] At step S710, when the air conditioning system is turned on and operates in the cooling mode, at a set period, obtain the outlet temperature of the outdoor heat exchanger (such as T cold out), obtain the pipe temperature of the first indoor heat exchanger (such as T inner pipe 1), obtain the pipe temperature of the second indoor heat exchanger (such as T inner pipe 2), obtain the supplementary air temperature of the flash evaporator (such as T supplementary air), obtain the first suction temperature of the compressor (specifically, the suction temperature T suction 1 at the first suction port of the compressor), and obtain the second suction temperature of the compressor (specifically, the suction temperature T suction 2 at the first suction port of the compressor).

[0113] At step S720, in the cooling mode, in combination with 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 supplementary air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, control the rotational speeds of the internal and external fans of the air conditioning system, the frequency of the compressor, the opening degrees of the first throttling device, the second throttling device, and the third throttling device, so as to adjust the supplementary air volume of the compressor and make the refrigeration capacity of the air conditioning system in a better state.

[0114] In the solution of the present invention, the control of the compressor frequency of the air conditioning system is similar to the control solution of the air conditioning system in the related solution, which is mainly determined by the indoor and outdoor ambient temperatures, the set temperature and wind speed, and the temperature difference between the indoor ambient temperature and the set temperature, and will not be elaborated. Different from the control solution of the air conditioning system in the related solution, in the solution of the present invention, the throttling device of the air conditioning system is controlled by parameters such as the supplementary air temperature difference, multiple suction superheats, and discharge superheat to ensure the energy-saving and stable operation of the system.

[0115] In some embodiments, in step S720, in the cooling mode, in combination with 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 supplementary air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, the specific process of controlling the rotational speeds of the internal and external fans of the air conditioning system, the frequency of the compressor, the opening degrees of the first throttling device, the second throttling device, and the third throttling device is as follows in the following exemplary description.

[0116] The following combines Figure 8 A schematic flowchart of an embodiment of controlling the opening degrees of the first throttling device, the second throttling device, and the third throttling device in the refrigeration process in the method of the present invention shown below further illustrates the specific process of controlling the opening degrees of the first throttling device, the second throttling device, and the third throttling device in the refrigeration process in step S720, including: steps S810 to S840.

[0117] Step S810, in the cooling mode, controlling the speeds of the internal and external fans to be respective set speeds, the frequency of the compressor to be the set frequency, and controlling the openings of the first throttling device, the second throttling device, and the third throttling device to be respective set openings; Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system shown in the figure is based on the air supply temperature Tsupply of the flash evaporator, the high and low temperature suction superheat of the compressor and the exhaust superheat of the compressor. Since most of the related schemes are still heating and cooling air conditioners, the scheme of the present invention also writes a refrigeration control method of the system, which is mainly to make the system run better, have high refrigeration capacity and energy-saving operation. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system in cooling mode shown in the figure includes: step 11, after the air-conditioning system is turned on, the operation mode is determined. If it is cooling mode, the indoor and outdoor ambient temperature, the set temperature, and the set wind speed are collected in the cooling mode, and the internal and external fan speeds, the compressor operating frequency, and the initial opening of the valve are set according to the built-in program, and the operation time t1 is performed, and then step 12 is performed. The range of time t1 is 3 to 10 minutes.

[0118] Step S820, in cooling mode, after a set time, determine the average value of the tube temperature of the first indoor heat exchanger and the tube temperature of the second indoor heat exchanger as the first average value, determine the average value of the first average value and the outlet temperature of the outdoor heat exchanger as the second average value (such as TmiddleTemperature), and determine the difference between the second average value and the make-up air temperature of the flash evaporator as the make-up air temperature difference of the air conditioning system (such as ΔTMake-upAir). Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: step 12, collecting temperature sensing package data according to period t2, calculating T intermediate temperature and ΔT air supply, and then executing step 13.

[0119] In step 12, Tintermediate temperature = [Tcold out + (Tinner tube 1 + Tinner tube 2) / 2] / 2, wherein Tcold out is the outlet temperature of the outdoor heat exchanger, Tinner tube 1 is the tube temperature of the indoor heat exchanger 1, and Tinner tube 2 is the tube temperature of the indoor heat exchanger 2. In step 12, ΔTsupplement air = Tintermediate temperature - Tsupplement air; wherein Tsupplement air is the temperature of the third port of the flash evaporator, i.e., the port where the flash evaporator is connected to the compressor.

[0120] Step S830: In cooling mode, adjusting the opening of the first throttling device according to the temperature difference of the supplementary air of the air conditioning system. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system shown in the figure during cooling also includes: step 13, adjusting the opening of valve A according to ΔT air supplement, running for t3 time, and then executing step 14.

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

[0122] Combine the following Fig. 9 The flowchart of an embodiment of adjusting the opening of the first throttling device according to the supplementary temperature difference of the air-conditioning system in the cooling mode in the method of the present invention further illustrates the specific process of adjusting the opening of the first throttling device according to the supplementary temperature difference of the air-conditioning system in the cooling mode in step S830, including: step S910 to step S940.

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

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

[0125] Step S930: In the cooling mode, if it is determined that the air supply temperature difference of the air conditioning system is equal to the set air supply target value, the opening degree 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 supply temperature difference of the air conditioning system is less than the set air supply target value, the opening of the first throttling device is controlled to be reduced by a set value based on the current value.

[0127] like Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system during cooling also includes: in step 13, when ΔT air supply is greater than the target value, the opening of valve A is increased, and when ΔT air supply is less than the target value, the opening of valve A is decreased. The target value range of ΔT air supply is 2°C to 3°C.

[0128] Step S840, in cooling mode, after a set period of time, determine the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger, record it as the first cooling suction temperature difference of the air conditioning system (such as ΔT suction 1 in cooling mode); and adjust the opening of the second throttling device according to the first cooling suction temperature difference of the air conditioning system. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system in cooling mode also includes: step 14, after adjusting the opening of valve A according to ΔT air supply and running for t3 time, calculating ΔT air intake 1, adjusting the opening of valve B according to ΔT air intake 1, running for t3 time, and then executing step 15. The range of time t3 is 120 seconds to 180 seconds.

[0129] In the solution of the present invention, in the cooling mode, the opening of the first throttling device is adjusted according to the supplementary air temperature difference of the air conditioning system, so as to ensure energy-saving and stable operation of the air conditioning system. If the opening of the first throttling device is too large, it may cause liquid to be carried over, and the refrigeration capacity will be low and fluctuate greatly; if the opening is too small, the refrigerant flow rate is small, which will also lead to low refrigeration capacity; through the control method of the solution of the present invention, the first throttling device can be adjusted to a better state, so that the system can play a better performance.

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

[0131] Combine the following Fig.10 The method of the present invention is shown as a flow chart of an embodiment of adjusting the opening of the second throttling device according to the first refrigeration suction temperature difference of the air-conditioning system in the cooling mode, further illustrating the specific process of adjusting the opening of the second throttling device according to the first refrigeration suction temperature difference of the air-conditioning system in the cooling mode in step S840, including: step S1010 to step S1040.

[0132] Step S1010, in cooling mode, determining whether a first cooling air intake temperature difference of the air conditioning system is greater than a set first cooling air intake target value; wherein the set first cooling air intake target value is, for example, a target value of ΔT suction 1 during cooling. The range of the target value of ΔT suction 1 is 3°C to 5°C.

[0133] Step S1020, in cooling mode, 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, the opening of the second throttling device is controlled to be increased by a set value based on the current value.

[0134] Step S1030: In the cooling mode, if it is determined that the first cooling air intake temperature difference of the air-conditioning system is equal to the set first cooling air intake target value, 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 air intake temperature difference of the air-conditioning system is less than the set first cooling air intake target value, the opening of the second throttling device is controlled to be closed by a set value based on the current value.

[0136] like Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: in step 14, ΔTsuction 1 = Tsuction 1 - Tinner tube 1, Tsuction 1 is the suction temperature of the first suction port of the compressor, and Tinner tube 1 is the tube temperature of the indoor heat exchanger 1.

[0137] In step 14, the opening of valve B is adjusted according to ΔTinhalation 1, specifically: when ΔTinhalation 1 is greater than the target value, the opening of valve B is increased, and when ΔTinhalation 1 is less than the target value, the opening of valve B is decreased. The target value range of ΔTinhalation 1 is 3°C to 5°C.

[0138] In the solution of the present invention, in the cooling mode, the opening of the second throttling device is adjusted according to the first cooling suction temperature difference of the air conditioning system, so as to ensure energy-saving and stable operation of the air conditioning system. Among them, the second throttling device is mainly used to adjust the high-temperature suction superheat. The high-temperature suction superheat is negative, it may carry liquid, the superheat is too large, and the refrigerant flow is too small, which may all lead to poor system refrigeration capacity. Through the control method of the solution of the present invention, the second throttling device can be adjusted to a better state, so that the system can play a better performance.

[0139] Step S850, in cooling mode, after a set period of time, determine the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger, record it as the second cooling suction temperature difference of the air conditioning system (such as 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. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: step 15, after adjusting the opening of valve B according to ΔTintake 1 and running for t3 time, calculating ΔTintake 2, adjusting the opening of valve C according to ΔTintake 2, running for t3 time, and then executing step 16.

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

[0141] Combine the following Fig.11 The method of the present invention is shown as a flow chart of an embodiment of adjusting the opening of the third throttling device according to the second refrigeration suction temperature difference of the air-conditioning system in the cooling mode, further illustrating the specific process of adjusting the opening of the third throttling device according to the second refrigeration suction temperature difference of the air-conditioning system in the cooling mode in step S850, including: step S1110 to step S1140.

[0142] Step S1110, in cooling mode, determining whether the second cooling air intake temperature difference of the air conditioning system is greater than a set second cooling air intake target value; wherein the set second cooling air intake target value is, for example, a target value of ΔT air intake 2 during cooling. The range of the target value of ΔT air intake 2 is 3°C to 5°C.

[0143] Step S1120, in the 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, the opening of the third throttling device is controlled to be increased by a set value based on the current value.

[0144] Step S1130, in the cooling mode, if it is determined that the second cooling air intake temperature difference of the air-conditioning system is equal to the set second cooling air intake target value, 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 suction temperature difference of the air-conditioning system is less than the set second cooling suction target value, the opening of the third throttling device is controlled to be closed by a set value based on the current value.

[0146] like Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: in step 15, ΔTsuction 2 = Tsuction 2 - Tinner tube 2, Tsuction 2 is the suction temperature of the second suction port of the compressor, and Tinner tube 2 is the tube temperature of the indoor heat exchanger 2.

[0147] In step 15, the opening of valve C is adjusted according to ΔTsuction 2, specifically: if ΔTsuction 2 is greater than the target value, the opening of valve C is increased, and if it is less than the target value, the opening of valve C is decreased. The target value range of ΔTsuction 2 is 3°C to 5°C. The opening ranges of valves A, B, and C are all 0B to 500B, and the opening range is 10B to 20B each time.

[0148] In the solution of the present invention, in the cooling mode, the opening of the third throttling device is adjusted according to the second cooling suction temperature difference of the air conditioning system, so as to ensure energy-saving and stable operation of the air conditioning system. Among them, the third throttling device is mainly used to adjust the low-temperature suction superheat. The low-temperature suction superheat is negative, which may carry liquid, the superheat is too large, and the refrigerant flow is too small, which may all lead to poor system refrigeration capacity. Through the control method of the solution of the present invention, the third throttling device can be adjusted to a better state, so that the system can play a better performance.

[0149] Step S860, in cooling mode, after a set period of time, determine whether the air supply air difference of the air conditioning system reaches the set air supply target value, the second cooling air suction air difference of the air conditioning system reaches the set first cooling air suction target value, and the second cooling air suction air difference of the air conditioning system reaches the set second cooling air suction target value: if satisfied, maintain the current operation, that is, control the speed of the internal and external fans to their respective set speeds, the frequency of the compressor to the set frequency, the opening of the first throttling device to the current value, the opening of the second throttling device to the current value, and the opening of the third throttling device to the current value and continue to operate; if not satisfied, return to redefine the air supply air difference of the air conditioning system. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system during cooling also includes: step 16, after the opening of the C valve is adjusted according to ΔT suction 2 and the operation time is t3, it is judged whether ΔT air supply, ΔT suction 1, and ΔT suction 2 have reached the target value: if the target value is not reached, the opening of the corresponding throttling device is continued to be adjusted according to ΔT air supply, ΔT suction 1, and ΔT suction 2; if the target value is reached, it is operated according to this frequency opening until the machine is shut down or the indoor and outdoor temperature setting parameters change. Wherein, when the indoor and outdoor temperature setting parameters change, the opening of the corresponding throttling device is continued to be adjusted according to ΔT air supply, ΔT suction 1, and ΔT suction 2, specifically: when the indoor and outdoor temperature setting parameters change, ΔT air supply, ΔT suction 1, and ΔT suction 2 are calculated according to the latest data collected, and the opening of the corresponding throttling device is adjusted accordingly. Wherein, the opening range of valve A, valve B, and valve C is 0B~500B, and the opening range of each adjustment is 10B~20B. The target value range of ΔT inhalation is 2℃~3℃, and the target value range of ΔT inhalation 1 and ΔT inhalation 2 is 3℃~5℃.

[0150] In the scheme of the present invention, in the cooling 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 supply 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 speed of the internal and external 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, thereby ensuring energy-saving and stable operation of the air-conditioning system.

[0151] In the related scheme, the cooling operation first passes through the second heat exchanger (medium temperature evaporator) into the four-pipe liquid storage tank (flash evaporator); while in the scheme of the present invention, the refrigerant coming out of the three-pipe liquid storage tank (flash evaporator) enters the evaporator, and then is divided into high and low temperature evaporators through the throttling device. When the related scheme is heating, the third throttling device is closed, which is equivalent to the heat exchanger connected to the third throttling device not participating in the circulation, and theoretically the heating capacity will be reduced.

[0152] In the scheme of the present invention, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (valve A) and a throttling device (valve B) connected in series, and the outlet of the outdoor unit heat exchanger is a three-way structure, one way is connected to a one-way valve + capillary tube, and the other way is connected to the throttling device valve A. When cooling, the refrigerant can only enter the valve A from the condenser and then enter the flash evaporator. Fig.13 Middle (b) Figure. The throttling device (C valve) of the indoor evaporator makes the temperature of evaporator 1 and evaporator 2 different, thus achieving dual evaporation temperature.

[0153] By adopting the technical solution of this embodiment, three throttling devices (such as valve A, valve B and valve C) are set for a three-cylinder air-supplement dual-temperature air-conditioning system (i.e., an air-conditioning system with a three-cylinder compressor, a dual-room indoor heat exchanger and a flash evaporator), valve A is set in the pipeline between the flash evaporator and the indoor heat exchanger, valve B is set in the pipeline between the dual indoor heat exchanger and the flash evaporator, and valve C is set in the pipeline where the indoor heat exchanger 2 in the dual indoor heat exchanger is located (specifically, valve C is set in the pipeline between the indoor heat exchanger 2 and valve B in the dual indoor heat exchanger); for the control strategy of the valve opening of the throttling device, three control modes are set: the first is to set a three-way valve, a capillary tube and a one-way valve, the three-way valve is connected to the outdoor heat exchanger, valve A and the one-way valve respectively, and the capillary tube and the one-way valve can connect the pipeline where valve A, flash evaporator and valve B are located Bypass; the second is to set a capillary tube, which is set in the pipeline between the flash evaporator and the compressor; the third is to set a capillary tube, which is set in the pipeline between the double indoor heat exchanger and the B valve; in the refrigeration mode, the control is based on the make-up air temperature Tmake-up of the flash evaporator, the high and low temperature suction superheat of the compressor and the exhaust superheat of the compressor; in the heating mode, in the first control mode, the control is based on the suction superheat 1 of the compressor; in the second control mode and the third control mode, the control is based on the exhaust superheat and suction superheat 1 of the compressor, which can realize throttling control under different circumstances; thus, by setting three throttling devices and setting auxiliary throttling devices (specifically setting capillaries in different ways), the make-up air amount of the compressor is controlled and the heating performance is improved.

[0154] According to an embodiment of the present invention, a control device for an air conditioning system corresponding to the control method for the air conditioning system is also provided. Fig.12 The structural schematic diagram of an embodiment of the device of the present invention is shown. The air-conditioning system is a three-cylinder air-injection dual-temperature air-conditioning system, and the three-cylinder air-injection dual-temperature air-conditioning system has a compressor, an outdoor heat exchanger, a dual indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device. The dual indoor heat exchanger includes a first indoor heat exchanger and a second indoor heat exchanger. The first throttling device is arranged on the pipeline between the flash evaporator and the outdoor heat exchanger, the second throttling device is arranged on the pipeline between the dual indoor heat exchanger and the flash evaporator, and the third throttling device is arranged on the pipeline on the side where the second indoor heat exchanger is connected to the second throttling device (specifically, the third throttling device is arranged on the pipeline between the second indoor heat exchanger and the second throttling device, and is not on the pipeline between the first indoor heat exchanger and the second throttling device). The auxiliary throttling device is arranged in the air supply pipeline of the compressor, and the auxiliary throttling device is used to assist in adjusting the air supply amount of the compressor. The compressor is a three-cylinder compressor. The first indoor heat exchanger is as shown in FIG. Fig.13 (a) Fig.15 and Fig.16Condenser 1, Fig.13 (b) the evaporator 1, the second indoor heat exchanger such as Fig.13 (a) Fig.15 and Fig.16 Condenser 2, Fig.13 (b) evaporator 2, outdoor heat exchanger such as Fig.13 (a) Fig.15 and Fig.16 The evaporator in Fig.13 (b) In the condenser, the first throttling device is such as valve A, the second throttling device is such as valve B, the third throttling device is such as valve C, and the auxiliary throttling device is such as valve Fig.13 Capillaries and one-way valves in Fig.15 The capillaries in Fig.16 In the capillary tube, etc.; in the scheme of the present invention, Fig.12 As shown, the control device of the air conditioning system includes: an acquisition unit 102 and a control unit 104.

[0155] Wherein, the acquisition unit 102 is configured to acquire the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor (such as the exhaust temperature of the compressor Texhaust) according to a set period when the air conditioning system is turned on and runs in a heating mode, acquire the first suction temperature of the compressor (specifically, the suction temperature of the first suction port of the compressor Tsuction1), and acquire the pipe temperature of the outdoor heat exchanger (such as the outdoor heat exchanger pipe temperature Texotube); wherein the set period is such as time t2, and the range of time t2 is 60 seconds to 120 seconds. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0156] The control unit 104 is configured to control the speed of the internal and external 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 the 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, so as to adjust the air supply volume of the compressor so that the heating capacity of the air conditioning system is within the set heating capacity range. The specific functions and processing of the control unit 104 refer to step S120.

[0157] According to the solution of the present invention, in the three-cylinder air-injection dual-temperature air-conditioning system, an auxiliary throttling device is adopted during the heating operation, such as a bypass throttling device (such as a capillary tube) and selectively combined with a one-way valve, so as to solve the problem of low heating capacity caused by unreasonable air supply volume, improve the heating effect of the system, and thus solve the problem of insufficient heating capacity of the three-cylinder air-injection dual-temperature air-conditioning system.

[0158] 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 Fig.13 The capillary tube shown; a bypass pipeline is arranged 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 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] Fig.13 Schematic diagram of the structure of the first embodiment of the air conditioning system, wherein (a) is a schematic diagram of the structure of the air conditioning system in the heating mode, and (b) is a schematic diagram of the structure of the air conditioning system in the cooling mode. Fig.13 The 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 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 heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode), a one-way valve and a capillary tube. Among them, 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 air intake port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first air intake port of the compressor. The fourth valve port of the four-way valve component 1 is divided into two paths after passing through the indoor heat exchanger 2 and the C valve: one path is connected to the first port of the flash evaporator after passing through the B valve, and the other path is connected to the second valve port of the three-way valve after passing 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 after passing through the outdoor heat exchanger. The third valve port of the three-way valve is connected to the second port of the flash evaporator after passing through valve A, and the third port of the flash evaporator is connected to the third air intake port of the compressor. The fourth valve port of the four-way valve component 2 is connected 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, that is, the allowed flow direction of the one-way valve is from the capillary tube to the second valve port of the three-way valve.

[0160] like Fig.13As shown, in the scheme of the present invention, the outdoor unit of the air-conditioning system adopts a three-cylinder compressor + flash evaporator, the indoor unit adopts a dual-temperature evaporator, and multiple throttling devices are set. In addition to the capillary connected to the one-way valve, the air-conditioning system in the scheme of the present invention also adopts three throttling devices (A valve, B valve, C valve), preferably an electronic expansion valve, and a programmable thermal expansion valve can also be used. The outlet of the outdoor unit heat exchanger is a three-way structure, one way is connected to the one-way valve + capillary tube, and the other way is connected to the throttling device A valve. When heating, close the B valve, and the refrigerant comes out of the indoor heat exchanger through the capillary tube and the one-way valve, and enters the outdoor heat exchanger and the flash evaporator respectively, so as to adjust the air supply volume and improve the heating performance. When cooling, the refrigerant enters the A valve from the outdoor heat exchanger and then enters the flash evaporator.

[0161] The control unit 104, in the heating mode, controls the rotation speeds of the internal and external 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 exhaust temperature of the compressor, and according to the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, including:

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

[0163] The control unit 104 is also specifically configured to, in the heating mode, 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, control the speed of the internal and external fans to be the respective set speeds, the frequency of the compressor to be the set frequency, the opening of the first throttling device to be the set first initial opening, the opening of the second throttling device to be 0, and the opening of the third throttling device to be the set maximum opening; after the set time, adjust 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; wherein the set time is such as t1 time, and the range of time t1 is 3 to 10 minutes. The set first initial opening is the initial opening 1 of valve A. The range of initial opening 1 of valve A is 50B to 100B. The specific functions and processing of the control unit 104 can also be found in step S220.

[0164] The control unit 104 is also specifically configured to, in the 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, control the speed of the internal and external fans to be the respective set speeds, the frequency of the compressor to be the set frequency, the opening of the first throttling device to be the set second initial opening, the opening of the second throttling device to be 0, and the opening of the third throttling device to be the set maximum opening. The set second initial opening is the initial opening 2 of the A valve. The range of the initial opening 2 of the A valve is 150B to 300B. The specific functions and processing of the control unit 104 can also be found in step S230.

[0165] Fig.14 For Fig.13 The schematic diagram of the valve opening control process of the air conditioning system is shown in FIG. Fig.14 As shown, in the solution of the present invention, the air conditioning system uses the air supply temperature, the suction superheat, the exhaust superheat, etc. to control the throttling device. In the scheme of the present invention, the air-conditioning system includes multiple temperature sensing bags. In addition to the environmental temperature sensing bag for detecting the indoor ambient temperature Tinner loop, the indoor unit also has two evaporator tube temperature sensing bags for detecting the tube temperatures of the two indoor heat exchangers, such as the tube temperatures Tinner tube 1 and Tinner tube 2 of the two evaporators in the cooling mode, while the air-conditioning system in the related scheme has only one inner tube temperature sensing bag; in addition to the environmental temperature sensing bag for detecting the outdoor ambient temperature Touter loop, the exhaust temperature sensing bag for detecting the exhaust temperature Texhaust of the compressor, and the tube temperature sensing bag of the outdoor heat exchanger (such as the condenser tube temperature sensing bag in the cooling mode) for detecting the outdoor heat exchanger tube temperature Touter tube, the outdoor unit is also equipped with an air supply temperature sensing bag located at the flash evaporator outlet (the third port of the flash evaporator, i.e., the port connected to the flash evaporator and the compressor) for detecting the air supply temperature Tsupply of the flash evaporator, a condenser outlet temperature sensing bag for detecting the outlet temperature Tcoldout of the outdoor heat exchanger, and two suction temperature sensing bags for detecting the suction temperature Tsupply1 and Tsupply2 of the compressor. The temperatures here are the actual detection values ​​of the temperature sensing package. Fig.14 As shown in FIG. 1 , the control strategy of the throttling device during heating is based on the suction superheat of the compressor. Fig.14 As shown, Fig.13 The control strategy of the throttling device of the air conditioning system shown in the figure during heating includes:

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

[0167] Step 22, determine whether the outdoor environment temperature Touter ring ≤ the set Touter ring low temperature: if not, execute step 23; if yes, execute step 24. The set Touter ring low temperature is the low temperature range of Touter ring, and the low temperature range of Touter ring is -5℃~2℃.

[0168] Step 23, if the outdoor ambient temperature Touter ring ≤ the set Touter ring low temperature is not satisfied, the program will be based on the internal and external fan speeds, compressor operating frequency and the initial opening of the valve (the initial opening of valve A is 2, valve B is closed, and valve C is at the maximum opening), and the system will be operated until shutdown or the indoor and outdoor temperature setting parameters change; if the indoor and outdoor temperature setting parameters change, the system will return to step 21. The range of the initial opening 2 of valve A is 150B to 300B.

[0169] Step 24: If Touter ring ≤ the set Touter ring low temperature, the program will be run for t1 time according to the internal and external fan speeds, compressor operating frequency and initial valve opening (initial opening 1 of valve A, valve B closed, valve C at maximum opening), and then step 25 will be executed. The initial opening 1 of valve A ranges from 50B to 100B.

[0170] In the scheme of the present invention, a capillary tube and a one-way valve are added, and their function is to control the air supply volume of the air conditioning system during heating operation to prevent excessive air supply volume, resulting in air supply with liquid, and reducing the heating capacity; if there is no capillary tube and one-way valve, the refrigerant will enter the flash evaporator through the B valve, and then the liquid refrigerant will enter the evaporator through the A valve, and the gas refrigerant will enter the flash evaporator, and the air supply volume cannot be well controlled. The scheme of the present invention proposes a system and a control scheme for improving the heating capacity of a three-cylinder air-supplement dual-temperature air conditioning system, and the air conditioning system includes but is not limited to wall-mounted units, cabinet units, multi-split units, etc. In the three-cylinder air-supplement dual-temperature air conditioning system in the related scheme, the refrigerant enters the flash evaporator through the B valve after coming out of the indoor heat exchanger, and then a part enters the third air intake 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 when the opening is relatively small, the opening of the B valve can only take a larger value. In this case, the air supply volume entering the flash evaporator will be too large, resulting in air supply with liquid, low exhaust temperature, poor heating capacity, and even unstable system operation.

[0171] In the scheme of the present invention, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (valve A) and a throttling device (valve B) in series, and the outlet of the outdoor unit heat exchanger is a three-way structure, one way is connected to the check valve + capillary tube, and the other way is connected to the throttling device valve A. When heating, the valve B is closed, and the refrigerant comes out of the indoor heat exchanger through the capillary tube and the check valve, and enters the outdoor heat exchanger and the flash evaporator respectively. The refrigerant vapor separated in the flash evaporator enters the third air intake port of the compressor, so as to adjust the air supply amount and improve the heating performance. Fig.13 Middle (a) figure.

[0172] In the scheme of the present invention, based on the auxiliary throttling device composed of a first capillary tube and a one-way valve, in the 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 internal and external 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 are controlled, so that the air supply volume can be adjusted to improve the heating performance.

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

[0174] The control unit 104 is further configured to determine the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger in the heating mode, which is recorded as the heating suction temperature difference of the air conditioning system (such as ΔTsuction1). The specific functions and processing of the control unit 104 are also shown in step S310.

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

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

[0177] The control unit 104 is further configured to, in the heating mode, control the opening 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 equal to the set heating suction target value, and then control the speed of the internal and external fans to be the respective set speeds, the frequency of the compressor to be the set frequency, the opening of the first throttling device to be the current value, the opening of the second throttling device to be 0, and the opening of the third throttling device to be the set maximum opening to continue to operate. The specific functions and processing of the control unit 104 are also shown in step S340.

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

[0179] Specifically, Fig.14 As shown, Fig.13 The control strategy of the throttling device of the air conditioning system shown in the figure during heating also includes:

[0180] Step 25, after running for t1 time, calculate ΔTsuction1=Tsuction1-Texternal pipe, when ΔTsuction1 is greater than the target value, increase the opening of valve A, when ΔTsuction1 is less than the target value, decrease the opening of valve A, and then execute step 26. Tsuction1 is the suction temperature of the first suction port of the compressor, and Texternal pipe is the pipe temperature of the outdoor heat exchanger. The opening range of valve A, valve B, and valve C is 0B~500B, and the opening range is 10B~20B each time.

[0181] Step 26, after running for t3 time, determine whether ΔT suction 1 reaches the target value: if it does not reach the target value, continue to adjust the opening of valve A according to ΔT suction 1; if it reaches the target value, run at this frequency opening until it is shut down or the indoor and outdoor temperature setting parameters change. If the indoor and outdoor temperature setting parameters change, return to step 21.

[0182] In the scheme of the present invention, based on the auxiliary throttling device composed of a first capillary tube and a one-way valve, in the heating mode, the opening 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 as to adjust the air supply amount and improve the heating performance.

[0183] 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 as Fig.15 The capillary in the third capillary is Fig.16 The capillary tube in the second chamber; the second capillary tube or the fourth throttling device is arranged in the pipeline between the flash evaporator and the compressor, specifically, in the pipeline between the flash evaporator and the third air intake port of the compressor; the third capillary tube or the fifth throttling device is arranged in the pipeline between the dual indoor heat exchanger and the second throttling device.

[0184] Fig.15 It is a structural diagram of a second embodiment of an air-conditioning system, specifically, it is a structural diagram of the air-conditioning system in a heating mode. Fig.15This is a second system diagram that is beneficial to improving heating performance. A capillary tube (or electronic expansion valve) is connected between the flash evaporator outlet and the compressor inlet to control the air supply volume. Fig.15 The 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 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 heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode) and a capillary tube. Among them, 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 air intake port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first air intake 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 air inlet of the compressor through a 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] Fig.16 It is a structural diagram of a third embodiment of an air-conditioning system, specifically, it is a structural diagram of the air-conditioning system in a heating mode. Fig.16 The third system diagram is helpful to improve the heating performance, where a capillary tube (or electronic expansion valve) is connected in series before valve B. Fig.16 The 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 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 heating mode), an indoor heat exchanger 2 (such as a condenser 2 in heating mode) and a capillary tube. Among them, 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 air intake port of the compressor, and the third valve port of the four-way valve component 2 is connected to the first air intake 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 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 after passing through the A valve and the indoor heat exchanger. The third port of the flash evaporator is connected to the third air intake 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 after passing through the indoor heat exchanger 1.

[0186] in, Fig.15 and Fig.16The main purpose is to control the amount of gas entering the flash evaporator to prevent excessive gas supply, which will cause gas to carry liquid and reduce heating capacity.

[0187] The control unit 104 controls the rotation speeds of the internal and external 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 the 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, and further includes:

[0188] The control unit 104 is further configured to control the rotation speeds of the internal and external fans to be respective set rotation speeds, the frequency of the compressor to be a set frequency, the openings of the first throttling device and the second throttling device to be respective set openings, and the opening of the third throttling device to be a set maximum opening in the heating mode. The specific functions and processing of the control unit 104 are also referred to step S410. Fig.17 for Fig.15 and Fig.16 The figure shows the valve opening control flow diagram of the air conditioning system in heating mode. Fig.15 and Fig.16 In the example shown, the valve opening control mode in cooling mode remains unchanged, but the operating parameters will be different due to the different positions of the serial capillary tubes. Fig.17 As shown in FIG. 1 , the valve opening control strategy in the heating mode is controlled based on the exhaust superheat and suction superheat of the compressor. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air-conditioning system in the heating mode shown includes: step 31, judging the operating mode after starting up, if it is the heating mode, collecting the indoor and outdoor ambient temperature, set temperature, set wind speed, and setting the internal and external fan speeds, compressor operating frequency and initial valve opening according to the program (C valve always maintains the maximum opening in the heating mode), running for t1 time, and then executing step 32.

[0189] The control unit 104 is further configured to adjust the opening of the second throttling device according to the exhaust temperature of the compressor after a set time in the heating mode. The specific functions and processing of the control unit 104 are also shown in step S420. The set time is such as t1 time. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air-conditioning system in the heating mode shown also includes: step 32, collecting temperature sensing package data according to period t2, adjusting the opening of valve B according to the exhaust temperature T exhaust of the compressor, and then executing step 33.

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

[0191] The control unit 104 is also specifically configured to determine the relationship between the exhaust temperature of the compressor and the set first exhaust temperature threshold, the set second exhaust temperature threshold, and the set third exhaust temperature threshold in the heating mode; 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 TExhaust_B1 target value, the set second exhaust temperature threshold is such as the TExhaust_B2 target value, and the set third exhaust temperature threshold is such as the TExhaust_B3 target value. The specific functions and processing of the control unit 104 can also be found in step S510.

[0192] The control unit 104 is further configured to, in the heating mode, increase the opening of the second throttling device by a set first opening value based on the current value 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; wherein the set first opening value is such as KExhaust_B1. The specific functions and processing of the control unit 104 are also referred to step S520.

[0193] The control unit 104 is further configured to, in the heating mode, increase the opening of the second throttling device by a set second opening value based on the current value if it is determined that the exhaust temperature of the compressor is greater than or equal to a set second exhaust temperature threshold, wherein the set second opening value is greater than the set first opening value; wherein the set second opening value is such as KExhaust_B2. The specific functions and processing of the control unit 104 are also referred to step S530.

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

[0195] like Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air conditioning system in the heating mode shown in the figure also includes: in step 32, adjusting the opening of the B valve according to the exhaust temperature T exhaust of the compressor, specifically including:

[0196] ① When the exhaust temperature of the compressor is Texhaust ≥ Texhaust_B1, the B valve increases Kexhaust_B1 according to the current opening;

[0197] ② When the exhaust temperature of the compressor is Texhaust ≥ Texhaust_B2, the B valve increases Kexhaust_B2 according to the current opening;

[0198] ③When the exhaust temperature of the compressor is Texhaust < Texhaust_B3, valve B resumes operation at the reference opening.

[0199] Among them, the target value range of T EXHAUST_B1 is (88℃~92℃), and the range of K EXHAUST_B1 is (4B~6B); the target value range of T EXHAUST_B2 is (93℃~97℃), and the range of K EXHAUST_B2 is (8B~10B); the target value range of T EXHAUST_B3 is (75℃~85℃).

[0200] In the scheme of the present invention, based on the auxiliary throttling device composed of the second capillary or the third capillary, in the heating mode, the opening of the second throttling device is adjusted according to the exhaust temperature of the compressor, so as to adjust the air supply amount and improve the heating performance.

[0201] The control unit 104 is also specifically configured to 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 in the heating mode, and record it as the heating suction temperature difference of the air-conditioning system (such as ΔT suction 1 in the heating mode); and adjust the opening of the first throttling device according to the heating suction temperature difference of the air-conditioning system. The specific functions and processing of the control unit 104 can also be found in step S430. Among them, the set period of time is such as time t3, and the range of time t3 is 120 to 180 seconds. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air-conditioning system in the heating mode shown also includes: step 33, adjusting the opening of valve A according to ΔTsuction 1, and then executing step 34.

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

[0203] The control unit 104 is further configured to determine whether the heating air intake temperature difference of the air conditioning system is greater than a set heating air intake target value in the heating mode; wherein the set heating air intake target value is, for example, a target value of ΔT intake 1. The range of the target value of ΔT intake 1 is 3°C to 5°C. The specific functions and processing of the control unit 104 are also referred to step S610.

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

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

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

[0207] like Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air conditioning system in the heating mode shown in the figure also includes: in step 33, after the opening of the B valve is adjusted according to the exhaust temperature Texhaust of the compressor for t3 time, ΔTsuction1=Tsuction1-Texternal pipe is calculated, and when ΔTsuction1 is greater than the target value, the opening of the A valve is increased, and when ΔTsuction1 is less than the target value, the opening of the A valve is decreased, and then step 34 is executed. The opening ranges of the A valve, the B valve, and the C valve are all 0B to 500B, and the opening range of each adjustment is 10B to 20B.

[0208] In the scheme of the present invention, based on the auxiliary throttling device composed of the second capillary or the third capillary, in the heating mode, the opening of the first throttling device is adjusted according to the heating intake temperature difference of the air-conditioning system, so as to adjust the air supply amount and improve the heating performance.

[0209] The control unit 104 is also specifically configured to determine, in the heating mode, after a set period of time, whether the exhaust temperature of the compressor reaches the set exhaust temperature target value and the heating intake air temperature difference of the air-conditioning system reaches the set heating intake air target value: if satisfied, maintain the current operation, that is, control the speed of the internal and external fans to their respective set speeds, the frequency of the compressor to the set frequency, the opening of the first throttling device to the current value, the opening of the second throttling device to the current value, and the opening of the third throttling device to the set maximum opening to continue operation; if not satisfied, return to redetermine the heating intake air temperature difference of the air-conditioning system, and re-adjust the opening of the first throttling device according to the heating intake air temperature difference of the air-conditioning system. For the specific functions and processing of the control unit 104, please refer to step S440. Fig.17 As shown, Fig.15 and Fig.16 The valve opening control process of the air conditioning system in the heating mode shown in the figure also includes: step 34, after running for t3 time, judging whether T exhaust and ΔT suction 1 have reached the target value: if the target value has not been reached, the opening of the corresponding throttling device is adjusted continuously according to T exhaust and ΔT suction 1; if the target value has been reached, the system is operated at this frequency opening until the system is shut down or the indoor and outdoor temperature setting parameters change. When the indoor and outdoor temperature setting parameters change, the opening of the corresponding throttling device is adjusted continuously according to T exhaust and ΔT suction 1.

[0210] In the scheme of the present invention, based on the auxiliary throttling device composed of a second capillary tube or a third capillary tube, in the heating mode, based on 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 speed of the internal and external 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 are controlled, so as to adjust the air supply amount and improve the heating performance.

[0211] In some embodiments, the control system of the air conditioning system according to the solution of the present invention further includes:

[0212] The acquisition unit 102 is also configured to acquire the outlet temperature (such as T cold out) of the outdoor heat exchanger, acquire the tube temperature (such as T inner tube 1) of the first indoor heat exchanger, acquire the tube temperature (such as T inner tube 2) of the second indoor heat exchanger, acquire the make-up air temperature (such as T make-up air) of the flash evaporator, acquire the first suction temperature of the compressor (specifically, the suction temperature T suction 1 of the first suction port of the compressor), and acquire the second suction temperature of the compressor (specifically, the suction temperature T suction 2 of the first suction port of the compressor) according to a set cycle when the air conditioning system is turned on and runs in a cooling mode. For specific functions and processing of the acquisition unit 102, please refer to step S710.

[0213] The control unit 104 is also configured to control the speed of the internal and external 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 the cooling mode, 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 supply air 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 supply air volume of the compressor so that the refrigeration capacity of the air conditioning system is in a better state. The specific functions and processing of the control unit 104 are also shown in step S720.

[0214] The control of the compressor frequency of the air conditioning system in the scheme of the present invention is similar to the control scheme of the air conditioning system in the related scheme, which is mainly determined by the indoor and outdoor ambient temperature, the set temperature and the windshield, and the temperature difference between the indoor ambient temperature and the set temperature, and will not be 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 invention is controlled by parameters such as the temperature difference of the supplementary air, multiple suction superheats, and exhaust superheats 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 speed of the internal and external 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 supply air 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 control the rotation speeds of the internal and external fans to be respectively set rotation speeds, the frequency of the compressor to be set frequency, and the openings of the first throttling device, the second throttling device, and the third throttling device to be respectively set openings in the cooling mode. The specific functions and processing of the control unit 104 are also referred to step S810. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system shown in the figure is based on the supply air temperature Tsupply of the flash evaporator, the high and low temperature suction air superheat of the compressor and the exhaust air superheat of the compressor. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16The control strategy of the throttling device of the air-conditioning system in cooling mode shown in the figure includes: step 11, after the air-conditioning system is turned on, the operation mode is determined. If it is cooling mode, the indoor and outdoor ambient temperature, the set temperature, and the set wind speed are collected in the cooling mode, and the internal and external fan speeds, the compressor operating frequency, and the initial opening of the valve are set according to the built-in program, and the operation time t1 is performed, and then step 12 is performed. The range of time t1 is 3 to 10 minutes.

[0217] The control unit 104 is also specifically configured to, in the cooling mode, after a set period of time, determine 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, determine the first average value and the average value of the outlet temperature of the outdoor heat exchanger as a second average value (such as Tintermediate temperature), and determine the difference between the second average value and the make-up air temperature of the flash evaporator as the make-up air temperature difference of the air conditioning system (such as ΔTmake-up air). For the specific functions and processing of the control unit 104, please refer to step S820. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: step 12, collecting temperature sensing package data according to period t2, calculating T intermediate temperature and ΔT air supply, and then executing step 13.

[0218] In step 12, Tintermediate temperature = [Tcold out + (Tinner tube 1 + Tinner tube 2) / 2] / 2, wherein Tcold out is the outlet temperature of the outdoor heat exchanger, Tinner tube 1 is the tube temperature of the indoor heat exchanger 1, and Tinner tube 2 is the tube temperature of the indoor heat exchanger 2. In step 12, ΔTsupplement air = Tintermediate temperature - Tsupplement air; wherein Tsupplement air is the temperature of the third port of the flash evaporator, i.e., the port where the flash evaporator is connected to the compressor.

[0219] The control unit 104 is further configured to adjust the opening of the first throttling device according to the temperature difference of the air conditioning system in the cooling mode. The specific functions and processing of the control unit 104 are also shown in step S830. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system shown in the figure during cooling also includes: step 13, adjusting the opening of valve A according to ΔT air supplement, running for t3 time, and then executing step 14.

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

[0221] The control unit 104 is further configured to determine whether the air supply temperature difference of the air conditioning system is greater than the set air supply target value in the cooling mode. The specific functions and processing of the control unit 104 are also shown in step S910. The set air supply target value is such as the target value of ΔT air supply. The range of the target value of ΔT air supply is 2°C to 3°C.

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

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

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

[0225] like Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air conditioning system during cooling also includes: in step 13, when ΔT air supply is greater than the target value, the opening of valve A is increased, and when ΔT air supply is less than the target value, the opening of valve A is decreased. The target value range of ΔT air supply is 2°C to 3°C.

[0226] In the solution of the present invention, in the cooling mode, the opening of the first throttling device is adjusted according to the supplementary air temperature difference of the air-conditioning system, so as to ensure energy-saving and stable operation of the air-conditioning system.

[0227] The control unit 104 is also specifically configured to determine the difference between the first suction temperature of the compressor and the tube temperature of the first indoor heat exchanger after a set period of time in the cooling mode, and record it as the first cooling suction temperature difference of the air-conditioning system (such as ΔT suction 1 in the cooling mode); and adjust the opening of the second throttling device according to the first cooling suction temperature difference of the air-conditioning system. The specific functions and processing of the control unit 104 can also be found in step S840. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16The control strategy of the throttling device of the air conditioning system in cooling mode also includes: step 14, after adjusting the opening of valve A according to ΔT air supply and running for t3 time, calculating ΔT air intake 1, adjusting the opening of valve B according to ΔT air intake 1, running for t3 time, and then executing step 15. The range of time t3 is 120 seconds to 180 seconds.

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

[0229] The control unit 104 is further configured to determine whether the first refrigeration suction air temperature difference of the air conditioning system is greater than the set first refrigeration suction air target value in the refrigeration mode. The specific functions and processing of the control unit 104 are also referred to step S1010. The set first refrigeration suction air target value is such as the target value of ΔT suction air 1 during cooling. The range of the target value of ΔT suction air 1 is 3°C to 5°C.

[0230] The control unit 104 is further configured to, in the cooling mode, control the opening of the second throttling device to increase by a set value based on a current value if it is determined that the first cooling suction air temperature difference of the air conditioning system is greater than a set first cooling suction air target value. The specific functions and processing of the control unit 104 are also shown in step S1020.

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

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

[0233] like Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: in step 14, ΔTsuction 1 = Tsuction 1 - Tinner tube 1, Tsuction 1 is the suction temperature of the first suction port of the compressor, and Tinner 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 ΔTinhalation 1, specifically: when ΔTinhalation 1 is greater than the target value, the opening of valve B is increased, and when ΔTinhalation 1 is less than the target value, the opening of valve B is decreased. The target value range of ΔTinhalation 1 is 3°C to 5°C.

[0235] In the solution of the present invention, in the cooling mode, the opening of the second throttling device is adjusted according to the first cooling suction temperature difference of the air-conditioning system, so as to ensure energy-saving and stable operation of the air-conditioning system.

[0236] The control unit 104 is also specifically configured to determine the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger after a set period of time in the cooling mode, and record it as the second cooling suction temperature difference of the air-conditioning system (such as ΔT suction 2 in the cooling mode); and adjust the opening of the third throttling device according to the second cooling suction temperature difference of the air-conditioning system. The specific functions and processing of the control unit 104 can also be found in step S850. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: step 15, after adjusting the opening of valve B according to ΔTintake 1 and running for t3 time, calculating ΔTintake 2, adjusting the opening of valve C according to ΔTintake 2, running for t3 time, and then executing step 16.

[0237] In some embodiments, the control unit 104, in the cooling mode, adjusts the opening 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 determine whether the second refrigeration suction air temperature difference of the air conditioning system is greater than the set second refrigeration suction air target value in the cooling mode. The specific functions and processing of the control unit 104 are also referred to step S1110. The set second refrigeration suction air target value is such as the target value of ΔT suction air 2 during cooling. The range of the target value of ΔT suction air 2 is 3°C to 5°C.

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

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

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

[0242] like Fig.14 As shown, Fig.13 , Fig.15 and Fig.16 The control strategy of the throttling device of the air-conditioning system shown in the figure during cooling also includes: in step 15, ΔTsuction 2 = Tsuction 2 - Tinner tube 2, Tsuction 2 is the suction temperature of the second suction port of the compressor, and Tinner tube 2 is the tube temperature of the indoor heat exchanger 2.

[0243] In step 15, the opening of valve C is adjusted according to ΔTsuction 2, specifically: if ΔTsuction 2 is greater than the target value, the opening of valve C is increased, and if it is less than the target value, the opening of valve C is decreased. The target value range of ΔTsuction 2 is 3°C to 5°C. The opening ranges of valves A, B, and C are all 0B to 500B, and the opening range is 10B to 20B each time.

[0244] In the solution of the present invention, in the cooling mode, the opening of the third throttling device is adjusted according to the second cooling suction temperature difference of the air-conditioning system, so as to ensure energy-saving and stable operation of the air-conditioning system.

[0245] The control unit 104 is also specifically configured to determine, in the cooling mode, after a set period of time, whether the make-up air temperature difference of the air-conditioning system reaches the set make-up air target value, the second refrigeration suction air temperature difference of the air-conditioning system reaches the set first refrigeration suction air target value, and the second refrigeration suction air temperature difference of the air-conditioning system reaches the set second refrigeration suction air target value: if satisfied, maintain the current operation, that is, control the speed of the internal and external fans to their respective set speeds, the frequency of the compressor to the set frequency, the opening of the first throttling device to the current value, the opening of the second throttling device to the current value, and the opening of the third throttling device to the current value and continue to operate; if not satisfied, return to redetermine the make-up air temperature difference of the air-conditioning system. Please refer to step S860 for the specific functions and processing of the control unit 104. Fig.14 As shown, Fig.13 , Fig.15 and Fig.16The control strategy of the throttling device of the air conditioning system shown in the cooling state also includes: step 16, after the opening of the C valve is adjusted according to ΔT suction 2 and the operation time is t3, it is judged whether ΔT air supply, ΔT suction 1, and ΔT suction 2 have reached the target value: if the target value has not been reached, the opening of the corresponding throttling device is continued to be adjusted according to ΔT air supply, ΔT suction 1, and ΔT suction 2; if the target value has been reached, the opening of the corresponding throttling device is operated according to this frequency opening until the machine is shut down or the indoor and outdoor temperature setting parameters change. Wherein, when the indoor and outdoor temperature setting parameters change, the opening of the corresponding throttling device is continued to be adjusted according to ΔT air supply, ΔT suction 1, and ΔT suction 2. Wherein, the opening range of the A valve, the B valve, and the C valve are all 0B~500B, and the opening range of each adjustment is 10B~20B. The target value range of ΔT air supply is 2℃~3℃, and the target value range of ΔT suction 1 and ΔT suction 2 is 3℃~5℃.

[0246] In the scheme of the present invention, in the cooling 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 supply 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 speed of the internal and external 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, thereby ensuring energy-saving and stable operation of the air-conditioning system.

[0247] In the related scheme, the refrigeration operation first passes through the second heat exchanger (medium-temperature evaporator) into the four-tube liquid storage tank (flash evaporator); while in the scheme of the present invention, the refrigerant coming out of the three-tube liquid storage tank (flash evaporator) enters the evaporator, and then is divided into high and low temperature evaporators through a throttling device.

[0248] In the scheme of the present invention, the outdoor unit of the air conditioning system adopts a three-cylinder compressor, a flash evaporator, a throttling device (valve A) and a throttling device (valve B) connected in series, and the outlet of the outdoor unit heat exchanger is a three-way structure, one way is connected to a one-way valve + capillary tube, and the other way is connected to the throttling device valve A. When cooling, the refrigerant can only enter the valve A from the condenser and then enter the flash evaporator. Fig.13 Middle (b) Figure. The throttling device (C valve) of the indoor evaporator makes the temperature of evaporator 1 and evaporator 2 different, thus achieving dual evaporation temperature.

[0249] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0250] According to an embodiment of the present invention, an air conditioning system corresponding to the control device of the air conditioning system is also provided. The air conditioning system may include: the control device of the air conditioning system described above.

[0251] Since the processing and functions implemented by the air-conditioning system of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0252] According to an embodiment of the present invention, a computer program product corresponding to an air-conditioning system is also provided, comprising a computer program, which implements the steps of the above-mentioned control method of the air-conditioning system when executed by a processor.

[0253] Since the processing and functions implemented by the product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned air-conditioning system, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0254] According to an embodiment of the present invention, a storage medium corresponding to the control method of the air-conditioning system is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the control method of the air-conditioning system described above.

[0255] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0256] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0257] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that: The air conditioning system comprises a compressor, an outdoor heat exchanger, a dual indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device, wherein the dual indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, wherein the first throttling device is arranged on a pipeline between the flash evaporator and the outdoor heat exchanger, wherein the second throttling device is arranged on a pipeline between the dual indoor heat exchanger and the flash evaporator, wherein the third throttling device is arranged on a pipeline on a side where the second indoor heat exchanger is connected to the second throttling device, and wherein the auxiliary throttling device is used to assist in adjusting the air supply volume of the compressor; the control method of the air conditioning system comprises: When the air conditioning system is turned on and operates in a heating mode, obtaining the outdoor ambient temperature of the air conditioning system or the exhaust temperature of the compressor, obtaining the first suction temperature of the compressor, and obtaining the pipe temperature of the outdoor heat exchanger according to a set period; Based on the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor, and in accordance with the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger, the speed of the internal and external 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 are controlled.

2. The control method of the air conditioning system according to claim 1, characterized in that: The auxiliary throttling device comprises: a first capillary tube, a one-way valve and a three-way valve; a bypass pipeline is arranged 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 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; 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 internal and external 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 are controlled, 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; 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, the rotation speeds of the internal and external fans are controlled to be the respective set rotation speeds, the frequency of the compressor is controlled to be the set frequency, the opening of the first throttling device is controlled to be the set first initial opening, the opening of the second throttling device is controlled to be 0, and the opening of the third throttling device is controlled to be the set maximum opening; after a set period of time, 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; If it is determined that the outdoor ambient temperature of the air-conditioning system is greater than the set outdoor ambient low temperature threshold, the speed of the indoor and outdoor fans is controlled to be the respective set speeds, the frequency of the compressor is controlled to be the set frequency, the opening of the first throttling device is controlled to be the set second initial opening, the opening of the second throttling device is controlled to be 0, and the opening of the third throttling device is controlled to be the set maximum opening.

3. The control method of the air conditioning system according to claim 2, characterized in that: According to the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, adjusting the opening of the first throttling device comprises: Determine the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, and record it as the heating suction temperature difference of the air conditioning system; Determining whether the heating and suction air temperature difference of the air conditioning system is greater than a set heating and suction air target value; If it is determined that the heating air intake temperature difference of the air conditioning system is greater than the set heating air intake target value, the opening degree of the first throttling device is controlled to be increased by a set value based on the current value, and then it is determined again whether the heating air intake temperature difference of the air conditioning system is greater than the set heating air intake target value; 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, controlling the opening degree of the first throttling device to maintain the current value; If it is determined that the heating intake temperature difference of the air-conditioning system is less than the set heating intake target value, the opening 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 intake temperature difference of the air-conditioning system is greater than the set heating intake target value.

4. The control method of the air conditioning system according to claim 1, characterized in that: 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 indoor heat exchanger and the second 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 pipe temperature of the outdoor heat exchanger, the speed of the internal and external 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 are controlled, and the method further includes: Controlling the rotation speeds of the inner and outer fans to be respective set rotation speeds, the frequency of the compressor to be a set frequency, the openings of the first throttling device and the second throttling device to be respective set openings, and the opening of the third throttling device to be a set maximum opening; After the set time, the opening of the second throttling device is adjusted according to the exhaust temperature of the compressor; After a set period of time, determining the difference between the first suction temperature of the compressor and the tube temperature of the outdoor heat exchanger, which is recorded as the heating suction temperature difference of the air-conditioning system; and adjusting the opening of the first throttling device according to the heating suction temperature difference of the air-conditioning system; After the set period, determine whether the exhaust temperature of the compressor reaches the set exhaust temperature target value and the heating intake temperature difference of the air-conditioning system reaches the set heating intake temperature target value: if satisfied, maintain the current operation; if not satisfied, return to redetermine the heating intake temperature difference of the air-conditioning system.

5. The control method of the air conditioning system according to claim 4, characterized in that: in, According to the exhaust temperature of the compressor, adjusting the opening of the second throttling device comprises: Determine the magnitude relationship between the exhaust temperature of the compressor 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, and the set exhaust temperature target value is the set third exhaust temperature threshold; 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, 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 exhaust temperature of the compressor is greater than or equal to a 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; If it is determined that the exhaust temperature of the compressor is less than a 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; and / or, According to the heating and absorption temperature difference of the air conditioning system, adjusting the opening of the first throttling device comprises: Determining whether the heating and suction air temperature difference of the air conditioning system is greater than a set heating and suction air target value; If it is determined that the heating and suction air temperature difference of the air conditioning system is greater than the set heating and suction air target value, the opening degree of the first throttling device is controlled to be increased by a set value based on the current value; 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, controlling the opening degree of the first throttling device to maintain the current value; If it is determined that the heating intake air temperature difference of the air conditioning system is less than the set heating intake air target value, the opening degree of the first throttling device is controlled to be closed by a set value based on the current value.

6. The control method of the air conditioning system according to any one of claims 1 to 5, characterized in that: Also includes: When the air conditioning system is turned on and operates in cooling mode, according to a set period, the outlet temperature of the outdoor heat exchanger is obtained, the tube temperature of the first indoor heat exchanger is obtained, the tube temperature of the second indoor heat exchanger is obtained, the supply air temperature of the flash evaporator is obtained, the first suction temperature of the compressor is obtained, and the second suction temperature of the compressor is obtained; 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 supply air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, the 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 are controlled.

7. The control method of the air conditioning system according to claim 6, characterized in that: 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 supply air temperature of the flash evaporator, the first suction temperature of the compressor, and the second suction temperature of the compressor, the speed of the internal and external 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: Controlling the rotation speeds of the inner and outer fans to respective set rotation speeds, the frequency of the compressor to a set frequency, and controlling the openings of the first throttling device, the second throttling device, and the third throttling device to respective set openings; After the time is set, 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 and recorded as the first average value, the average value of the first average value and the outlet temperature of the outdoor heat exchanger is determined and recorded as the second average value, and the difference between the second average value and the make-up air temperature of the flash evaporator is determined as the make-up air temperature difference of the air-conditioning system; adjusting the opening of the first throttling device according to the supplementary air temperature difference of the air conditioning system; After a set period of time, determining a difference between a first suction temperature of the compressor and a tube temperature of the first indoor heat exchanger, which is recorded as a first refrigeration suction temperature difference of the air-conditioning system; and adjusting the opening of the second throttling device according to the first refrigeration suction temperature difference of the air-conditioning system; After the set period, the difference between the second suction temperature of the compressor and the tube temperature of the second indoor heat exchanger is determined, which is recorded as the second refrigeration suction temperature difference of the air-conditioning system; and the opening degree of the third throttling device is adjusted according to the second refrigeration suction temperature difference of the air-conditioning system; After the set period, determine whether the make-up air temperature difference of the air-conditioning system reaches the set make-up air target value, the second refrigeration suction air temperature difference of the air-conditioning system reaches the set first refrigeration suction air target value, and the second refrigeration suction air temperature difference of the air-conditioning system reaches the set second refrigeration suction air target value: if satisfied, maintain the current operation; if not satisfied, return to redefine the make-up air temperature difference of the air-conditioning system.

8. The control method of the air conditioning system according to claim 7, characterized in that: in, According to the supplementary air temperature difference of the air conditioning system, adjusting the opening of the first throttling device comprises: Determining whether the air supply temperature difference of the air conditioning system is greater than a set air supply target value; If it is determined that the air supply temperature difference of the air conditioning system is greater than the set air supply target value, the opening of the first throttling device is controlled to be increased by a set value based on the current value; If it is determined that the air supply temperature difference of the air conditioning system is equal to the set air supply target value, the opening degree of the first throttling device is controlled to maintain the current value; If it is determined that the air supply temperature difference of the air conditioning system is less than the set air supply target value, the opening of the first throttling device is controlled to be reduced by a set value based on the current value; and / or, According to the first refrigeration suction temperature difference of the air conditioning system, adjusting the opening degree of the second throttling device comprises: determining whether a first refrigeration air intake temperature difference of the air conditioning system is greater than a set first refrigeration air intake target value; If it is determined that the first cooling air intake temperature difference of the air conditioning system is greater than the set first cooling air intake 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 air temperature difference of the air conditioning system is equal to the set first refrigeration suction air target value, controlling the opening degree of the second throttling device to maintain a current value; If it is determined that the first refrigeration suction air temperature difference of the air conditioning system is less than the set first refrigeration suction air target value, the opening degree of the second throttling device is controlled to be closed by a set value based on the current value; and / or, According to the second refrigeration suction temperature difference of the air conditioning system, adjusting the opening degree of the third throttling device comprises: determining whether a second refrigeration air intake temperature difference of the air conditioning system is greater than a set second refrigeration air intake target value; If it is determined that the second cooling air intake temperature difference of the air conditioning system is greater than the set second cooling air intake 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 air temperature difference of the air conditioning system is equal to the set second refrigeration suction air target value, controlling the opening degree of the third throttling device to maintain the current value; If it is determined that the second refrigeration intake air temperature difference of the air-conditioning system is less than the set second refrigeration intake air target value, the opening degree of the third throttling device is controlled to be closed by a set value based on the current value.

9. A control device for an air conditioning system, characterized in that: The air conditioning system comprises a compressor, an outdoor heat exchanger, a dual indoor heat exchanger, a flash evaporator, a first throttling device, a second throttling device, a third throttling device and an auxiliary throttling device. The dual 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 dual indoor heat exchanger and the flash evaporator. The third throttling device is arranged on a pipeline on a side where the second indoor heat exchanger is connected to the second throttling device. The auxiliary throttling device is used to assist in adjusting the air supply volume of the compressor. The control device of the air conditioning system comprises: an acquisition unit configured to acquire, in a case where the air-conditioning system is turned on and operates in a heating mode, an outdoor ambient temperature of the air-conditioning system or an exhaust temperature of the compressor, a first suction temperature of the compressor, and a pipe temperature of the outdoor heat exchanger according to a set period; A control unit is configured to control the speed of the internal and external 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 based on the outdoor ambient temperature of the air-conditioning system or the exhaust temperature of the compressor and in accordance with the first suction temperature of the compressor and the pipe temperature of the outdoor heat exchanger.

10. An air conditioning system, characterized in that: include: The control device for an air conditioning system as claimed in claim 9.

11. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the control method of the air-conditioning system according to any one of claims 1 to 8.

12. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the control method of the air conditioning system according to any one of claims 1 to 8 are implemented.

Images