Air conditioning system and control method thereof

Abstract

The present application relates to air conditioning system technical field, specifically provide a kind of air conditioning system and its control method, to solve the mode single that existing compressed air air conditioning system exists, cannot satisfy the problem of different scene use demand.For this purpose, the two ends of the first heat exchange passage of heat exchanger in air conditioning system are communicated with air compressor outlet and expander inlet respectively, expander outlet and target space air inlet and atmospheric environment are communicated by first valve alternatively, target space air outlet and air compressor inlet and fan air inlet are communicated by second valve alternatively, fan air outlet and the first end of second heat exchange passage are communicated, the second end of second heat exchange passage and target space air inlet and atmospheric environment are communicated by third valve alternatively, air compressor inlet and atmospheric environment are selectively communicated by fourth valve, fan air inlet and atmospheric environment are selectively communicated by fifth valve.According to target working mode, the state of each valve, air compressor, expander and fan is controlled, and refrigeration or heating is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning systems, and specifically provides an air conditioning system and a control method thereof. BACKGROUND

[0002] The existing air conditioning system includes a compressor, a condenser, a throttling device and an evaporator connected in sequence to form a circulating loop, the circulating loop being filled with refrigerant, low-temperature and low-pressure gaseous refrigerant being compressed by the compressor into high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant entering the condenser to be cooled into high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant passing through the throttling device to be throttled and decompressed into low-temperature and low-pressure gaseous refrigerant, the low-temperature and low-pressure gaseous refrigerant being compressed by the compressor again, and the cycle being repeated, so as to transport the heat of the space where the evaporator is located to the space where the condenser is located. However, the refrigerant is usually R134a, which is easy to leak and pollute the environment during use.

[0003] The above problems can be avoided by using a compressed air air conditioning system. The air conditioning system compresses air into high-temperature and high-pressure air by an air compressor, the high-temperature and high-pressure air flowing through a heat exchanger to be cooled and then entering an expander, the low-temperature and normal-pressure air being sent into the room after being expanded by the expander, and the original air in the room being returned to the compressor to be compressed. However, the air conditioning system has a single mode and cannot be used for heating.

[0004] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] The present application aims to solve the above technical problems, i.e., to solve the problem of the existing compressed air air conditioning system having a single mode and being unable to meet the use requirements of different scenes.

[0006] The application provides a control method of an air conditioning system, the air conditioning system comprising an air compressor, an expander, a fan and a first heat exchanger, the first heat exchanger having a first heat exchange channel and a second heat exchange channel, two ends of the first heat exchange channel being in communication with an outlet of the air compressor and an inlet of the expander respectively, an outlet of the expander being in selective communication with an air inlet of a target space and an atmospheric environment through a first valve, an air outlet of the target space being in selective communication with an inlet of the air compressor and an air inlet of the fan through a second valve, an air outlet of the fan being in communication with a first end of the second heat exchange channel, a second end of the second heat exchange channel being in selective communication with the air inlet of the target space and the atmospheric environment through a third valve, the inlet of the air compressor being in selective communication with the atmospheric environment through a fourth valve, and the air inlet of the fan being in selective communication with the atmospheric environment through a fifth valve; the control method comprising: determining a target working mode of the air conditioning system; and controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor, the expander and the fan according to the target working mode; wherein the working mode of the air conditioning system comprises a cooling mode and a heating mode.

[0007] In the preferred technical scheme of the above control method, the cooling mode comprises a first cooling mode; the step of "controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor, the expander and the fan according to the target working mode" specifically comprises: if the target working mode is the first cooling mode, controlling the first valve to be in a first state so that the outlet of the expander is in communication with the air inlet of the target space, controlling the second valve to be in a first state so that the air outlet of the target space is in communication with the air inlet of the fan, controlling the third valve to be in a first state so that the second end of the second heat exchange channel is in communication with the atmospheric environment, controlling the fourth valve to be in a first state so that the inlet of the air compressor is in communication with the atmospheric environment, controlling the fifth valve to be in a first state so that the air inlet of the fan is in communication with the atmospheric environment, and controlling the air compressor, the expander and the fan to be in working states.

[0008] In the preferred technical scheme of the control method, the refrigeration mode includes a second refrigeration mode; the step of "controlling the states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan according to the target operation mode" specifically includes: if the target operation mode is the second refrigeration mode, controlling the first valve to be in a first state so that the outlet of the expander is communicated with the air inlet of the target space, controlling the second valve to be in a second state so that the air outlet of the target space is communicated with the inlet of the air compression device, controlling the third valve to be in a first state so that the second end of the second heat exchange channel is communicated with the atmosphere, controlling the fourth valve to be in a second state so that the inlet of the air compression device is not communicated with the atmosphere, controlling the fifth valve to be in a first state so that the air inlet of the fan is communicated with the atmosphere, and controlling the air compression device, the expander and the fan to be in working states.

[0009] In the preferred technical scheme of the control method, the refrigeration mode includes a second refrigeration mode; the step of "controlling the states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan according to the target operation mode" specifically includes: if the target operation mode is the second refrigeration mode, controlling the first valve to be in a first state so that the outlet of the expander is communicated with the air inlet of the target space, controlling the second valve to be in a second state so that the air outlet of the target space is communicated with the inlet of the air compression device, controlling the third valve to be in a first state so that the second end of the second heat exchange channel is communicated with the atmosphere, controlling the fourth valve to be in a second state so that the inlet of the air compression device is not communicated with the atmosphere, controlling the fifth valve to be in a first state so that the air inlet of the fan is communicated with the atmosphere, and controlling the air compression device, the expander and the fan to be in working states.

[0010] In the preferred technical scheme of the control method, the heating mode comprises a second heating mode; and the step of "controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor device, the expander and the fan according to the target operation mode" specifically comprises: if the target operation mode is the second heating mode, controlling the first valve to be in a second state so that an outlet of the expander is communicated with an atmospheric environment, controlling the second valve to be in a first state so that an air outlet of the target space is communicated with an air inlet of the fan, controlling the third valve to be in a second state so that a second end of the second heat exchange channel is communicated with an air inlet of the target space, controlling the fourth valve to be in a first state so that an inlet of the air compressor device is communicated with the atmospheric environment, controlling the fifth valve to be in a second state so that the air inlet of the fan is not communicated with the atmospheric environment, and controlling the air compressor device, the expander and the fan to be in a working state.

[0011] In the preferred technical scheme of the control method, the operation mode of the air conditioning system further comprises a ventilation mode; and the step of "controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor device, the expander and the fan according to the target operation mode" specifically comprises: if the target operation mode is the ventilation mode, controlling the second valve to be in a second state so that an air outlet of the target space is communicated with an inlet of the air compressor device, controlling the third valve to be in a second state so that a second end of the second heat exchange channel is communicated with an air inlet of the target space, controlling the fifth valve to be in a first state so that the air inlet of the fan is communicated with an atmospheric environment, controlling the fourth valve to be in a first state so that the inlet of the air compressor device is communicated with the atmospheric environment and / or controlling the first valve to be in a second state so that an outlet of the expander is communicated with the atmospheric environment, controlling the air compressor device and the expander to be in a shutdown state, and controlling the fan to be in a working state.

[0012] In the preferred technical scheme of the control method, the step of "determining the target operation mode of the air conditioning system" specifically comprises: acquiring a target space temperature and a set temperature; comparing the target space temperature and the set temperature; if the target space temperature is greater than or equal to the set temperature, determining that the target operation mode of the air conditioning system is a cooling mode, otherwise determining that the target operation mode of the air conditioning system is a heating mode.

[0013] In the preferred technical solution of the control method, the step of obtaining the target space temperature and the set temperature specifically comprises: obtaining the target space temperature and the set temperature in the automatic mode; in the manual mode, determining whether the target operation mode is the ventilation mode, and if the target operation mode is not the ventilation mode, obtaining the target space temperature and the set temperature.

[0014] In the preferred technical solution of the control method, the control method further comprises: in the automatic mode, controlling the power of the air compression device, the expander and the fan according to the absolute value of the temperature difference between the target space temperature and the set temperature, wherein the power of the air compression device, the expander and the fan is positively correlated with the absolute value of the temperature difference; in the manual mode, obtaining the target air speed of the fan, and controlling the power of the air compression device, the expander and the fan according to the target air speed, wherein the power of the air compression device, the expander and the fan is positively correlated with the target air speed.

[0015] In the case of adopting the above technical solution, the states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan can be controlled according to the edging operation mode so that the air conditioning system is in the cooling mode or the heating mode.

[0016] Specifically, when the target working mode is determined to be the cooling mode, the first valve is controlled to be in the first state so that the outlet of the expander is communicated with the air inlet of the target space, the second valve is controlled to be in the first state so that the air outlet of the target space is communicated with the air inlet of the fan, the third valve is controlled to be in the first state so that the second end of the second heat exchange channel is communicated with the atmospheric environment, the fourth valve is controlled to be in the first state so that the inlet of the air compression device is communicated with the atmospheric environment, the fifth valve is controlled to be in the first state so that the air inlet of the fan is communicated with the atmospheric environment, and the air compression device, the expander and the fan are controlled to be in the working state. The inlet of the air compression device inhales the air in the atmospheric environment and compresses the air into high-temperature and high-pressure air. The high-temperature and high-pressure air flows into the first heat exchange channel. The air in the atmospheric environment and the air in the target space flow into the atmospheric environment after flowing through the second heat exchange channel under the action of the fan. The high-temperature and high-pressure air exchanges heat with the air in the second heat exchange channel after flowing in the first heat exchange channel, and then flows through the expander to become low-temperature and normal-pressure air after expansion. The low-temperature and normal-pressure air enters the target space. The original air in the target space flows to the fan, so that the low-temperature and normal-pressure air replaces the air in the target space, and the cooling of the target space is realized. Alternatively, when the target working mode is determined to be the cooling mode, the first valve is controlled to be in the first state so that the outlet of the expander is communicated with the air inlet of the target space, the second valve is controlled to be in the second state so that the air outlet of the target space is communicated with the inlet of the air compression device, the third valve is controlled to be in the first state so that the second end of the second heat exchange channel is communicated with the atmospheric environment, the fourth valve is controlled to be in the second state so that the inlet of the air compression device is not communicated with the atmospheric environment, the fifth valve is controlled to be in the first state so that the air inlet of the fan is communicated with the atmospheric environment, and the air compression device, the expander and the fan are controlled to be in the working state. The inlet of the air compression device inhales the air in the target space and compresses the air into high-temperature and high-pressure air. The high-temperature and high-pressure air flows into the first heat exchange channel. The air in the atmospheric environment flows back to the atmospheric environment after flowing through the second heat exchange channel under the action of the fan. The high-temperature and high-pressure air exchanges heat with the air in the second heat exchange channel after flowing in the first heat exchange channel, and then flows through the expander to become low-temperature and normal-pressure air after expansion. The low-temperature and normal-pressure air enters the target space. The original air in the target space flows into the air compression device, and the cycle is repeated, so that the temperature of the air in the target space is reduced.

[0017] When the target working mode is determined to be the heating mode, the first valve is controlled to be in the second state so that the outlet of the expander is communicated with the atmospheric environment, the second valve is controlled to be in the second state so that the air outlet of the target space is communicated with the inlet of the air compression device, the third valve is controlled to be in the second state so that the second end of the second heat exchange channel is communicated with the air inlet of the target space, the fourth valve is controlled to be in the second state so that the inlet of the air compression device is not communicated with the atmospheric environment, the fifth valve is controlled to be in the first state so that the air inlet of the fan is communicated with the atmospheric environment, the air compression device, the expander and the fan are controlled to be in the working state, the inlet of the air compression device inhales the air in the target space and compresses the air into high-temperature and high-pressure air, the high-temperature and high-pressure air flows into the first heat exchange channel, the atmospheric environment air flows into the second heat exchange channel under the action of the fan, the high-temperature and high-pressure air exchanges heat with the air in the second heat exchange channel in the first heat exchange channel, and the high-temperature and high-pressure air becomes low-temperature and atmospheric pressure air after flowing through the expander and expanding, and is discharged into the atmospheric environment, the atmospheric pressure air in the second heat exchange channel absorbs heat to become high-temperature and atmospheric pressure air and then flows into the target space, and the original air in the target space flows into the air compression device, so that the high-temperature and atmospheric pressure air replaces the air in the target space, and the temperature of the target space is raised. Alternatively, when the target working mode is determined to be the heating mode, the first valve is controlled to be in the second state so that the outlet of the expander is communicated with the atmospheric environment, the second valve is controlled to be in the first state so that the air outlet of the target space is communicated with the air inlet of the fan, the third valve is controlled to be in the second state so that the second end of the second heat exchange channel is communicated with the air inlet of the target space, the fourth valve is controlled to be in the first state so that the inlet of the air compression device is communicated with the atmospheric environment, the fifth valve is controlled to be in the second state so that the air inlet of the fan is not communicated with the atmospheric environment, the air compression device, the expander and the fan are controlled to be in the working state, the inlet of the air compression device inhales the air in the atmospheric environment and compresses the air into high-temperature and high-pressure air, the high-temperature and high-pressure air flows into the first heat exchange channel, the atmospheric pressure air in the target space flows into the second heat exchange channel under the action of the fan, the high-temperature and high-pressure air exchanges heat with the air in the second heat exchange channel in the first heat exchange channel, and the high-temperature and high-pressure air becomes low-temperature and atmospheric pressure air after flowing through the expander and expanding, and is discharged into the atmospheric environment, the atmospheric pressure air in the second heat exchange channel absorbs heat to become high-temperature and atmospheric pressure air and then flows into the target space, and the original air in the target space enters the fan, so that the temperature of the target space is raised.

[0018] Through the above arrangement, both cooling and heating can be realized, and the use requirements of different scenes are met, and the use experience of the user is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0019] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0020] Figure 1 is a structural schematic diagram of an air conditioning system according to an embodiment of the present application;

[0021] Figure 2 is a main step schematic diagram of the control method of the air conditioning system of the present application;

[0022] Figure 3 is a specific step diagram of the control method of the air conditioning system of the present application, in which the target working mode of the air conditioning system is determined.

[0023] List of reference signs:

[0024] 1, air compression device; 11, first air compression mechanism; 12, motor; 13, second air compression mechanism; 2, expander; 3, fan; 4, first heat exchanger; 5, cab; 61, first three-way valve; 62, second three-way valve; 63, third three-way valve; 64, first electromagnetic valve; 65, second electromagnetic valve; 7, second heat exchanger. DETAILED DESCRIPTION

[0025] First of all, those skilled in the art should understand that the embodiments described below are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. For example, although the air conditioning system of the present application is described by taking a vehicle as an example in the following embodiments, this does not constitute a limitation on the protection scope of the present application, and the air conditioning system of the present application can also be applied to rooms, offices and other places.

[0026] It should be noted that in the description of the present application, the terms "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0028] In view of the problems of the existing compressed air air conditioning system mentioned in the background technology that the mode is single and cannot meet the use requirements of different scenes, the application provides a control method of an air conditioning system, the air conditioning system comprising an air compression device, an expander, a fan and a first heat exchanger, the first heat exchanger having a first heat exchange channel and a second heat exchange channel, two ends of the first heat exchange channel being in communication with an outlet of the air compression device and an inlet of the expander respectively, an outlet of the expander being in selective communication with an air inlet of a target space and an atmospheric environment through a first valve, an air outlet of the target space being in selective communication with an inlet of the air compression device and an air inlet of the fan through a second valve, an air outlet of the fan being in communication with a first end of the second heat exchange channel, a second end of the second heat exchange channel being in selective communication with the air inlet of the target space and the atmospheric environment through a third valve, the inlet of the air compression device being in selective communication with the atmospheric environment through a fourth valve, the air inlet of the fan being in selective communication with the atmospheric environment through a fifth valve, the control method comprising: determining a target working mode of the air conditioning system; controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan according to the target working mode; wherein the working mode of the air conditioning system comprises a refrigeration mode and a heating mode. Through such a setting, both refrigeration and heating can be realized, the use requirements of different scenes are met, and the use experience of the user is optimized.

[0029] The application will be described below with reference to Figures 1 to 3 and in combination with an air conditioning system of a vehicle. Among them, Figure 1 is a structural schematic diagram of an air conditioning system of an embodiment of the application; Figure 2 is a main step schematic diagram of a control method of the air conditioning system of the application; Figure 3 is a specific step diagram of "determining a target working mode of the air conditioning system" in the control method of the air conditioning system of the application.

[0030] As Figure 1As shown, the vehicle's air conditioning system includes an air compressor 1, an expander 2, a fan 3, and a first heat exchanger 4. The air compressor 1 includes a first air compression mechanism 11 and a second air compression mechanism 13. The shaft of the first air compression mechanism 11 is connected to the output shaft of a motor 12, and the shaft of the second air compression mechanism 13 is coaxially connected to the shaft of the expander 2. The outlet of the first air compression mechanism 11 is connected to the inlet of the second air compression mechanism 13 via a connecting pipe. The inlet of the first air compression mechanism 11 serves as the inlet of the air compressor 1, and the outlet of the second air compression mechanism 13 serves as the outlet of the air compressor 1. The first heat exchanger 4 has a first heat exchange channel and a second heat exchange channel. The first end of the first heat exchange channel is connected to the outlet of the second air compression mechanism 12 (i.e., the outlet of the air compressor 1) via a connecting pipe, and the second end of the first heat exchange channel is connected to the inlet of the expander 2 via a connecting pipe. The outlet of expander 2 is connected to the inlet of the first three-way valve 61 (i.e., the first valve) via a connecting pipe. The first outlet of the first three-way valve 61 is connected to the first air inlet of the cab 5 (i.e., the target space) via a connecting pipe. The second outlet of the first three-way valve 61 is connected to the external environment (i.e., the atmospheric environment) via a connecting pipe. The air outlet of the cab 5 is connected to the inlet of the second three-way valve 62 (i.e., the second valve) via a connecting pipe. The first outlet of the second three-way valve 62 is connected to the inlet of the first air compression mechanism 11 via a connecting pipe. The second outlet of the second three-way valve 62 is connected to the inlet of the fan 3 via a connecting pipe. The air outlet of the fan 3 is connected to the first end of the second heat exchange channel via a connecting pipe. The second end of the second heat exchange channel is connected to the inlet of the third three-way valve 63 (i.e., the third valve) via a connecting pipe. The first outlet of the third three-way valve 63 is connected to the second air inlet of the cab 5 via a connecting pipe. The second outlet of the third three-way valve 63 is connected to the external environment via a connecting pipe. The inlet of the first air compressor 11 is connected to the external environment via a pipe, on which a first solenoid valve 64 (i.e., the fourth valve) is installed. The air inlet of the fan 2 is connected to the external environment via a pipe, on which a second solenoid valve 65 (i.e., the fifth valve) is installed. The air conditioning system also includes a second heat exchanger 7, which includes a third heat exchange channel and a fourth heat exchange channel. The third heat exchange channel is connected in series between the second end of the first heat exchange channel and the inlet of the expander 2, and the fourth heat exchange channel is connected in series between the air outlet of the cab 5 and the inlet of the second three-way valve 62.

[0031] like Figure 2 As shown, the control method of the air conditioning system mainly includes the following steps:

[0032] Step S100: Determine the target operating mode of the air conditioning system.

[0033] Step S200: Control the status of the first valve, second valve, third valve, fourth valve, fifth valve, air compressor, expander and fan according to the target working mode.

[0034] The working modes of the air conditioning system include a cooling mode, a heating mode and a ventilation mode. The cooling mode includes a first cooling mode and a second cooling mode, and the heating mode includes a first heating mode and a second heating mode.

[0035] As shown in FIG. 1, the step S100 specifically includes the following steps: Figure 3

[0036] The step S110 acquires the instruction of the user.

[0037] After the air conditioning system is started, the user inputs the instruction through a remote controller, a control panel, a voice interaction system or the like. The instruction input by the user includes an automatic mode / manual mode, an inner circulation mode / outer circulation mode, a ventilation mode, a set temperature, a wind speed gear and the like. The controller of the air conditioning system receives and acquires the instruction of the user.

[0038] The step S120 detects the temperature of the target space.

[0039] The controller of the air conditioning system controls the temperature sensor on the inner unit to detect the temperature (i.e. the temperature of the target space) in the cab 5.

[0040] The step S130 determines whether the automatic mode is set, and if yes, the step S141 is executed, otherwise the step S142 is executed.

[0041] The controller of the air conditioning system determines whether the automatic mode is set according to the instruction of the user, and if yes, the step S141 is executed, otherwise (i.e. the manual mode) the step S142 is executed.

[0042] The step S141 determines whether the outer circulation mode is set, and if yes, the step S151 is executed, otherwise the step S152 is executed.

[0043] The controller of the air conditioning system determines whether the outer circulation mode is set according to the instruction of the user, and if yes, the step S151 is executed, otherwise (i.e. the inner circulation mode) the step S152 is executed.

[0044] The step S142 determines whether the outer circulation mode is set, and if yes, the step S153 is executed, otherwise the step S154 is executed.

[0045] The controller of the air conditioning system determines whether the outer circulation mode is set according to the instruction of the user, and if yes, the step S153 is executed, otherwise (i.e. the inner circulation mode) the step S154 is executed.

[0046] The step S151 determines whether the temperature of the target space is greater than or equal to the set temperature, and if yes, the step S161 is executed, otherwise the step S162 is executed.

[0047] ​Step S152, it is judged whether the target space temperature is greater than or equal to the set temperature, if yes, step S163 is executed, if not, step S164 is executed.

[0048] Step S153, it is judged whether the ventilation mode is set, if yes, step S165 is executed, if not, step S166 is executed.

[0049] The controller of the air conditioning system judges whether the ventilation mode is set according to the user's instruction, if yes, step S165 is executed, if not, step S166 is executed.

[0050] Step S154, it is judged whether the target space temperature is greater than or equal to the set temperature, if yes, step S167 is executed, if not, step S168 is executed.

[0051] Step S161, the target working mode is the first refrigeration mode.

[0052] The controller of the air conditioning system confirms that the target working mode is the first refrigeration mode.

[0053] Step S162, the target working mode is the first heating mode.

[0054] The controller of the air conditioning system confirms that the target working mode is the first heating mode.

[0055] Step S163, the target working mode is the second refrigeration mode.

[0056] The controller of the air conditioning system confirms that the target working mode is the second refrigeration mode.

[0057] Step S164, the target working mode is the second heating mode.

[0058] The controller of the air conditioning system confirms that the target working mode is the second heating mode.

[0059] Step S165, the target working mode is the ventilation mode.

[0060] The controller of the air conditioning system confirms that the target working mode is the ventilation mode.

[0061] Step S166, it is judged whether the target space temperature is greater than or equal to the set temperature, if yes, step S171 is executed, if not, step S172 is executed.

[0062] Step S167, the target working mode is the first refrigeration mode.

[0063] The controller of the air conditioning system confirms that the target working mode is the first refrigeration mode.

[0064] Step S168, the target working mode is the first heating mode.

[0065] The controller of the air conditioning system confirms that the target operation mode is the first heating mode.

[0066] The step S200 specifically comprises:

[0067] When it is confirmed that the target operation mode is the first heating mode, the first three-way valve 61 is controlled to be in the first state (the inlet communicates with the first outlet) so that the outlet of the expander 2 communicates with the first air inlet of the cab 5, the second three-way valve 62 is controlled to be in the first state (the inlet communicates with the second outlet) so that the air outlet of the cab 5 communicates with the air inlet of the fan 3, the third three-way valve 63 is controlled to be in the first state (the inlet communicates with the second outlet) so that the second end of the second heat exchange passage communicates with the outside environment, the first electromagnetic valve 64 is controlled to be in the first state (the communication state) so that the inlet of the air compression device 1 communicates with the outside environment, the second electromagnetic valve 65 is controlled to be in the first state (the communication state) so that the air inlet of the fan 3 communicates with the outside environment, and the air compression device 1, the expander 2 and the fan 3 are controlled to be in the working state.

[0068] Under the driving of the motor 12, the first air compression mechanism 11 works, and the second air compression mechanism 13 works under the driving of the expander 2. The air in the outside environment enters the inlet of the first air compression mechanism 11 and is compressed, and the compressed air enters the inlet of the second air compression mechanism 13 and is further compressed, thereby forming high-temperature and high-pressure air. The high-temperature and high-pressure air flows into the first heat exchange passage, and the air in the outside environment flows through the second heat exchange passage under the action of the fan 3 and then flows back to the outside environment from the second outlet of the third three-way valve 63. After the high-temperature and high-pressure air exchanges heat with the air in the second heat exchange passage in the first heat exchange passage, the low-temperature and normal-pressure air flows through the expander 2 and becomes low-temperature and normal-pressure air after expansion. The low-temperature and normal-pressure air enters the cab 5 through the first air inlet of the cab 5, and the original air in the cab 5 flows through the second three-way valve 62 from the air outlet and then flows to the air inlet of the fan 3 from the second outlet of the second three-way valve 62, and finally flows to the outside environment from the second outlet of the third three-way valve 63, so that the low-temperature and normal-pressure air replaces the air in the cab 5, thereby achieving the cooling of the cab 5. In this way, the cooling of the cab 5 can be achieved, and fresh air can be introduced into the cab 5.

[0069] When it is confirmed that the target working mode is the second refrigeration mode, the first three-way valve 61 is controlled to be in the first state (the inlet communicates with the first outlet) so that the outlet of the expander 2 communicates with the first air inlet of the cab 5, the second three-way valve 62 is controlled to be in the second state (the inlet communicates with the first outlet) so that the air outlet of the cab 5 communicates with the inlet of the air compression device 1, the third three-way valve 63 is controlled to be in the first state (the inlet communicates with the second outlet) so that the second end of the second heat exchange channel communicates with the environment outside the vehicle, the first electromagnetic valve 64 is controlled to be in the second state (the off state) so that the inlet of the air compression device 1 does not communicate with the environment outside the vehicle, the second electromagnetic valve 65 is controlled to be in the first state (the on state) so that the air inlet of the fan 3 communicates with the environment outside the vehicle, and the air compression device 1, the expander 2 and the fan 3 are controlled to be in the working state.

[0070] The first air compression mechanism 11 works under the driving of the motor 12, the second air compression mechanism 13 works under the driving of the expander 2, the air in the cab 5 enters the inlet of the first air compression mechanism 11 from the outlet of the cab 5 through the second three-way valve 62 and is compressed, the compressed air enters the inlet of the second air compression mechanism 13 and is further compressed, thereby forming high-temperature and high-pressure air, the high-temperature and high-pressure air flows into the first heat exchange channel, the air in the environment outside the vehicle flows through the second heat exchange channel under the action of the fan 3 and flows back to the environment outside the vehicle from the second outlet of the third three-way valve 63, the high-temperature and high-pressure air exchanges heat with the air in the second heat exchange channel in the first heat exchange channel, and after the high-temperature and high-pressure air flows through the expander 2 and is expanded, the high-temperature and high-pressure air becomes low-temperature and normal-pressure air, the low-temperature and normal-pressure air enters the cab 5 through the first air inlet of the cab 5, the original air in the cab 5 flows through the second three-way valve 62 and returns to the first air compression mechanism 11 through the air outlet, and the cycle is repeated, thereby making the air in the cab 5 become low-temperature air and achieving the cooling of the cab 5. In this way, the cooling of the cab 5 can be achieved, and the air in the cab 5 can be prevented from being polluted when the environment outside the vehicle is in a pollution period.

[0071] When it is confirmed that the target working mode is the first heating mode, the first three-way valve 61 is controlled to be in the second state (the inlet communicates with the second outlet) so that the outlet of the expander 2 communicates with the environment outside the vehicle, the second three-way valve 62 is controlled to be in the second state (the inlet communicates with the first outlet) so that the air outlet of the cab 5 communicates with the inlet of the air compression device 1, the third three-way valve 63 is controlled to be in the second state (the inlet communicates with the first outlet) so that the second end of the second heat exchange channel communicates with the second air inlet of the cab 5, the first electromagnetic valve 64 is controlled to be in the second state (the off state) so that the inlet of the air compression device 1 does not communicate with the environment outside the vehicle, the second electromagnetic valve 65 is controlled to be in the first state (the on state) so that the air inlet of the fan 3 communicates with the environment outside the vehicle, and the air compression device 1, the expander 2 and the fan 3 are controlled to be in the working state.

[0072] The first air compression mechanism 11 is driven by the motor 12, and the second air compression mechanism 13 is driven by the expander 2. The air in the cab 5 enters the first air compression mechanism 11 from the outlet of the cab 5 through the second three-way valve 62, and is compressed. The compressed air enters the second air compression mechanism 13, and is further compressed, so as to form high-temperature and high-pressure air. The high-temperature and high-pressure air flows into the first heat exchange passage. The air in the environment outside the vehicle flows into the second heat exchange passage under the action of the fan 3. The high-temperature and high-pressure air exchanges heat with the air in the second heat exchange passage, and then flows through the expander 2, expands, and becomes low-temperature and normal-pressure air, and flows to the environment outside the vehicle through the second outlet of the first three-way valve 61. The normal-pressure air in the second heat exchange passage absorbs heat, becomes high-temperature and normal-pressure air, flows through the third three-way valve 63, and finally enters the cab 5 through the second air inlet of the cab 5. The original air in the cab 5 flows through the second three-way valve 62 from the air outlet of the cab 5, and enters the first air compression mechanism 11 from the inlet of the first air compression mechanism 11, so that the high-temperature and normal-pressure air replaces the air in the cab 5, and the cab 5 is heated. In this way, the cab 5 is cooled, fresh air is introduced into the cab 5, and the heat of the original air in the cab 5 is used, so that the electric energy required for the air compression device 1 to compress the air into high-temperature and high-pressure air is reduced.

[0073] When it is confirmed that the target working mode is the second heating mode, the first three-way valve 61 is controlled to be in the second state (the inlet is communicated with the second outlet) so that the outlet of the expander 2 is communicated with the environment outside the vehicle, the second three-way valve 62 is controlled to be in the first state (the inlet is communicated with the second outlet) so that the air outlet of the cab 5 is communicated with the air inlet of the fan 3, the third three-way valve 63 is controlled to be in the second state (the inlet is communicated with the first outlet) so that the second end of the second heat exchange passage is communicated with the second air inlet of the cab 5, the first electromagnetic valve 64 is controlled to be in the first state (the communication state) so that the inlet of the air compression device 1 is communicated with the environment outside the vehicle, the second electromagnetic valve 65 is controlled to be in the second state (the disconnected state) so that the air inlet of the fan 3 is not communicated with the environment outside the vehicle, and the air compression device 1, the expander 2, and the fan 3 are controlled to be in the working state.

[0074] The first air compression mechanism 11 works under the drive of the motor 12, and the second air compression mechanism 13 works under the drive of the expander 2. The air from the outside environment enters the first air compression mechanism 11 from the inlet and is compressed, and the compressed air enters the second air compression mechanism 13 from the inlet and is further compressed, thereby forming high-temperature and high-pressure air. The high-temperature and high-pressure air flows into the first heat exchange passage. The air in the cab 5 flows into the second heat exchange passage after passing through the second three-way valve 62 and the fan 3 under the action of the fan 3. The high-temperature and high-pressure air exchanges heat with the air in the second heat exchange passage in the first heat exchange passage, and then expands into low-temperature and normal-pressure air after passing through the expander 2 and flows to the outside environment through the second outlet of the first three-way valve 61. The normal-pressure air in the second heat exchange passage absorbs heat to become high-temperature normal-pressure air, which flows through the third three-way valve 63 and finally enters the cab 5 through the second air inlet of the cab 5. The original air in the cab 5 flows to the fan 3 after passing through the second three-way valve 62, and the cycle continues, thereby achieving the heating of the cab 5.

[0075] When it is confirmed that the target working mode is the ventilation mode, the first three-way valve 61 is controlled to be in the second state (the inlet is communicated with the second outlet) so that the outlet of the expander 2 is communicated with the outside environment, the second three-way valve 62 is controlled to be in the second state (the inlet is communicated with the first outlet) so that the air outlet of the cab 5 is communicated with the inlet of the air compression device 1, the third three-way valve 63 is controlled to be in the second state (the inlet is communicated with the first outlet) so that the second end of the second heat exchange passage is communicated with the second air inlet of the cab 5, the first electromagnetic valve 64 is controlled to be in the first state (the communication state) so that the inlet of the air compression device 1 is communicated with the outside environment, the second electromagnetic valve 65 is controlled to be in the first state (the communication state) so that the air inlet of the fan 3 is communicated with the outside environment, the air compression device 1 and the expander 2 are controlled to be in the stop state, and the fan 3 is controlled to be in the working state.

[0076] Under the action of the fan 3, the fresh air from the outside environment flows into the cab 5 through the second air inlet of the cab 5 in sequence through the fan 3, the second heat exchange passage and the third three-way valve 63. The original air in the cab 5 flows to the inlet of the air compression device 1 through the first outlet of the second three-way valve 62 from the air outlet of the cab 5. Part of the air flows to the outside environment from the inlet of the air compression device 1, and the other part flows through the air compression device 1, the first heat exchange passage and the expander 2 and finally flows to the outside environment through the second outlet of the first three-way valve 61, thereby providing fresh air into the cab 5.

[0077] It should be noted that in the ventilation mode, the first three-way valve 61 can also be controlled to be in the second state (the inlet communicates with the second outlet) so that the outlet of the expander 2 communicates with the environment outside the vehicle, the first electromagnetic valve 64 is controlled to be in the second state (off state) so that the inlet of the air compression device 1 does not communicate with the environment outside the vehicle, or the first three-way valve 61 can be controlled to be in the first state (the inlet communicates with the first outlet) so that the outlet of the expander 2 communicates with the first air inlet of the cab 5, and the first electromagnetic valve 64 is controlled to be in the first state (communication state) so that the inlet of the air compression device 1 communicates with the environment outside the vehicle. In addition, the air compression device can only include one air compression mechanism, the rotating shaft of the air compression mechanism is connected with the output shaft of the motor, and the rotating shaft of the air compression mechanism is coaxially connected with the rotating shaft of the expander. The inlet and outlet of the air compression mechanism are respectively used as the inlet and outlet of the air compression device. However, the efficiency of such an air compression device is not as high as that of the air compression device in the above embodiment. The first three-way valve 63 can also be replaced by a three-way pipe, and an electromagnetic valve is arranged on each of the two outlet branches of the three-way pipe. Similarly, the second three-way valve 64 can also be replaced by a three-way pipe, and an electromagnetic valve is arranged on each of the two outlet branches of the three-way pipe, and the third three-way valve 65 can also be replaced by a three-way pipe, and an electromagnetic valve is arranged on each of the two outlet branches of the three-way pipe. The second heat exchanger 7 in the above embodiment can also be removed. In addition, the air conditioning system in the above embodiment can also be applied to rooms, offices and the like.

[0078] Preferably, on the basis of the above embodiment, in the automatic mode, the power of the air compression device 1, the expander 2 and the fan 3 is controlled according to the absolute value of the temperature difference between the temperature of the cab and the set temperature, and the power of the air compression device 1, the expander 2 and the fan 3 is positively correlated with the absolute value of the temperature difference. For example, when the absolute value of the temperature difference is ≤2℃, the operating power of the air compression device 1 and the expander 2 is 200W, and the operating power of the fan 3 is 20W; when 2℃< the absolute value of the temperature difference ≤4℃, the operating power of the air compression device 1 and the expander 2 is 400W, and the operating power of the fan 3 is 40W; when 4℃< the absolute value of the temperature difference ≤6℃, the operating power of the air compression device 1 and the expander 2 is 600W, and the operating power of the fan 3 is 60W; when 6℃< the absolute value of the temperature difference ≤8℃, the operating power of the air compression device 1 and the expander 2 is 800W, and the operating power of the fan 3 is 80W; and when the absolute value of the temperature difference >8℃, the operating power of the air compression device 1 and the expander 2 is 1000W, and the operating power of the fan 3 is 100W.

[0079] In the manual mode, the powers of the air compression device 1, the expander 2 and the fan 3 are controlled according to the set wind speed gear, wherein the powers of the air compression device 1, the expander 2 and the fan 3 are positively correlated with the wind speed gear. For example, the wind speed gear includes five gears S1, S2, S3, S4 and S5, and the rotating speeds of the fan 3 corresponding to S1, S2, S3, S4 and S5 increase in turn. In the ventilation mode, the running power of the fan 3 is controlled to be 20W when the set wind speed gear is S1, the running power of the fan 3 is controlled to be 40W when the set wind speed gear is S2, the running power of the fan 3 is controlled to be 60W when the set wind speed gear is S3, the running power of the fan 3 is controlled to be 80W when the set wind speed gear is S4, and the running power of the fan 3 is controlled to be 100W when the set wind speed gear is S5. In the refrigeration or heating mode, the running power of the fan 3 is controlled to be 20W when the set wind speed gear is S1, and the running powers of the air compression device 1 and the expander 2 are both 200W, the running power of the fan 3 is controlled to be 40W when the set wind speed gear is S2, and the running powers of the air compression device 1 and the expander 2 are both 400W, the running power of the fan 3 is controlled to be 60W when the set wind speed gear is S3, and the running powers of the air compression device 1 and the expander 2 are both 600W, the running power of the fan 3 is controlled to be 80W when the set wind speed gear is S4, and the running powers of the air compression device 1 and the expander 2 are both 800W, the running power of the fan 3 is controlled to be 100W when the set wind speed gear is S5, and the running powers of the air compression device 1 and the expander 2 are both 1000W.

[0080] In another possible implementation, after starting, it is first determined whether the mode is the automatic mode or the manual mode, and then it is determined whether the mode is the internal circulation mode or the external circulation mode and the target space temperature and the set temperature when the mode is the automatic mode, and then it is determined whether the mode is the ventilation mode when the mode is the manual mode, and then the target space temperature and the set temperature are determined when the mode is not the ventilation mode.

[0081] In another possible implementation, the refrigeration mode only includes one of the first refrigeration mode and the second refrigeration mode in the above embodiments, and the heating mode only includes one of the first heating mode and the second heating mode in the above embodiments. After starting, the set temperature input by the user is obtained, and then it is determined whether the working mode is the refrigeration mode or the heating mode according to the set temperature and the detected temperature in the cab, and then the air conditioning system is controlled to operate according to the refrigeration mode or the heating mode.

[0082] In another aspect, the present application further provides an air conditioning system, and a controller of the air conditioning system includes a memory, a processor and a computer program, the computer program is stored in the memory and is configured to be executed by the processor to implement the control method of the air conditioning system according to any one of the above embodiments.

[0083] It should be noted that the memory in the above embodiments includes, but is not limited to, random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory, or register, etc., and the processor includes, but is not limited to, CPLD / FPGA, DSP, ARM processor, MIPS processor, etc.

[0084] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A control method of an air conditioning system, characterized by, The air conditioning system comprises an air compressor, an expander, a fan and a first heat exchanger, the first heat exchanger has a first heat exchange channel and a second heat exchange channel, two ends of the first heat exchange channel are in communication with an outlet of the air compressor and an inlet of the expander respectively, an outlet of the expander is in selective communication with an air inlet of a target space and an atmospheric environment through a first valve, an air outlet of the target space is in selective communication with an inlet of the air compressor and an air inlet of the fan through a second valve, an air outlet of the fan is in communication with a first end of the second heat exchange channel, a second end of the second heat exchange channel is in selective communication with the air inlet of the target space and the atmospheric environment through a third valve, the inlet of the air compressor is selectively in communication with the atmospheric environment through a fourth valve, the air inlet of the fan is selectively in communication with the atmospheric environment through a fifth valve; the control method comprises: determining a target working mode of the air conditioning system; controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor, the expander and the fan according to the target working mode; wherein the working mode of the air conditioning system comprises a cooling mode and a heating mode.

2. The control method according to claim 1, characterized by, The cooling mode comprises a first cooling mode; The step of "controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor, the expander and the fan according to the target working mode" specifically comprises: if the target working mode is the first cooling mode, controlling the first valve to be in a first state so that the outlet of the expander is in communication with the air inlet of the target space, controlling the second valve to be in a first state so that the air outlet of the target space is in communication with the air inlet of the fan, controlling the third valve to be in a first state so that the second end of the second heat exchange channel is in communication with the atmospheric environment, controlling the fourth valve to be in a first state so that the inlet of the air compressor is in communication with the atmospheric environment, controlling the fifth valve to be in a first state so that the air inlet of the fan is in communication with the atmospheric environment, and controlling the air compressor, the expander and the fan to be in working states.

3. The control method according to claim 2, characterized by, The cooling mode comprises a second cooling mode; The step of "controlling states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compressor, the expander and the fan according to the target working mode" specifically comprises: If the target working mode is the second refrigeration mode, the first valve is controlled to be in a first state so that the outlet of the expander is communicated with the air inlet of the target space, the second valve is controlled to be in a second state so that the air outlet of the target space is communicated with the inlet of the air compression device, the third valve is controlled to be in a first state so that the second end of the second heat exchange channel is communicated with the atmosphere, the fourth valve is controlled to be in a second state so that the inlet of the air compression device is not communicated with the atmosphere, the fifth valve is controlled to be in a first state so that the air inlet of the fan is communicated with the atmosphere, and the air compression device, the expander and the fan are controlled to be in working states.

4. The control method according to claim 1, characterized by, The heating mode includes a first heating mode; The step of "controlling the states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan according to the target working mode" specifically includes: If the target working mode is the first heating mode, the first valve is controlled to be in a second state so that the outlet of the expander is communicated with the atmosphere, the second valve is controlled to be in a second state so that the air outlet of the target space is communicated with the inlet of the air compression device, the third valve is controlled to be in a second state so that the second end of the second heat exchange channel is communicated with the air inlet of the target space, the fourth valve is controlled to be in a second state so that the inlet of the air compression device is not communicated with the atmosphere, the fifth valve is controlled to be in a first state so that the air inlet of the fan is communicated with the atmosphere, and the air compression device, the expander and the fan are controlled to be in working states.

5. The control method according to claim 4, characterized by The heating mode includes a second heating mode; The step of "controlling the states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan according to the target working mode" specifically includes: If the target working mode is the second heating mode, the first valve is controlled to be in a second state so that the outlet of the expander is communicated with the atmosphere, the second valve is controlled to be in a first state so that the air outlet of the target space is communicated with the air inlet of the fan, the third valve is controlled to be in a second state so that the second end of the second heat exchange channel is communicated with the air inlet of the target space, the fourth valve is controlled to be in a first state so that the inlet of the air compression device is communicated with the atmosphere, the fifth valve is controlled to be in a second state so that the air inlet of the fan is not communicated with the atmosphere, and the air compression device, the expander and the fan are controlled to be in working states.

6. The control method according to claim 1, characterized by The working mode of the air conditioning system further includes a ventilation mode, and the step of "controlling the states of the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the air compression device, the expander and the fan according to the target working mode" specifically includes: If the target working mode is the ventilation mode, controlling the second valve to be in a second state so that an air outlet of the target space is in communication with an inlet of the air compression device, controlling the third valve to be in a second state so that a second end of the second heat exchange channel is in communication with an air inlet of the target space, controlling the fifth valve to be in a first state so that an air inlet of the fan is in communication with an atmospheric environment, controlling the fourth valve to be in a first state so that the inlet of the air compression device is in communication with the atmospheric environment and / or controlling the first valve to be in a second state so that an outlet of the expander is in communication with the atmospheric environment, controlling the air compression device and the expander to be in a shutdown state, and controlling the fan to be in a working state.

7. The control method according to any one of claims 1 to 6, characterized by, The step of "determining the target working mode of the air conditioning system" specifically comprises: obtaining a target space temperature and a set temperature; comparing the target space temperature and the set temperature; if the target space temperature is greater than or equal to the set temperature, determining that the target working mode of the air conditioning system is a cooling mode, otherwise determining that the target working mode of the air conditioning system is a heating mode.

8. The control method according to claim 7 as dependent on claim 6, characterized in that, The step of "obtaining a target space temperature and a set temperature" specifically comprises: in an automatic mode, obtaining a target space temperature and a set temperature; in a manual mode, determining whether the target working mode is a ventilation mode, and if the target working mode is not a ventilation mode, obtaining a target space temperature and a set temperature.

9. The control method according to claim 8, characterized by, The control method further comprises: in an automatic mode, controlling the power of the air compression device, the expander and the fan according to the absolute value of the temperature difference between the target space temperature and the set temperature, wherein the power of the air compression device, the expander and the fan is positively correlated with the absolute value of the temperature difference; in a manual mode, obtaining a target wind speed of the fan, and controlling the power of the air compression device, the expander and the fan according to the target wind speed, wherein the power of the air compression device, the expander and the fan is positively correlated with the target wind speed.

10. An air conditioning system characterized by, comprises: a memory; a processor; and a computer program stored in the memory and configured to be executed by the processor to implement the control method of the air conditioning system according to any one of claims 1 to 9.

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