Vehicle air conditioning system and control method of two-position three-way reversing valve of vehicle air conditioning system

Abstract

The invention provides a vehicle air conditioning system and a control method of a two-position three-way reversing valve thereof, and the control method comprises the steps that the output end of a compressor is connected with a first pipeline, the two-position three-way reversing valve is arranged in the first pipeline, and a first opening and a second opening are formed in a valve seat of the two-position three-way reversing valve; the first opening is connected with the input end of the outdoor condenser and forms a first branch; the second opening is connected with the input end of the indoor condenser and forms a second branch; a valve element of the two-position three-way reversing valve is provided with a first flow channel, a second flow channel and a third flow channel which are communicated with one another, the first flow channel is connected with the refrigerant inlet, the second flow channel is connected with the first refrigerant outlet, and the third flow channel is connected with the second refrigerant outlet. The refrigerant inlet is connected with the first pipeline and keeps normally open, the included angle theta between the axis of the second flow channel and the axis of the third flow channel is larger than or equal to 80 degrees and smaller than or equal to 100 degrees, and in the process of switching the refrigerant outlet, refrigerant can always flow in the flow channels of the two-position three-way reversing valve, so that instantaneous pressure building in the reversing process is prevented, and the stability of an air conditioner system is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management technology, and in particular to a vehicle air-conditioning system and a control method for a two-position three-way reversing valve thereof. Background Art

[0002] With the development of the automotive industry, the performance and reliability requirements of vehicle air conditioning systems are getting higher and higher. In traditional vehicle air conditioning systems, there are often some problems in the structural design of the reversing valve, which may cause the air conditioning system to have a pressure-blocking phenomenon during operation, thus affecting the stability and reliability of the system.

[0003] In the prior art, there is a multi-way reversing valve proposed in application number 202211162939.9, which includes a valve body and a valve core. The valve body has a valve cavity and at least four valve ports connected to the valve cavity. The valve core can be movably arranged in the valve cavity. The valve core has at least two flow channels and a first insulation cavity located between two adjacent flow channels and other structures. However, in the process of flow path diversion of this reversing valve, when the position change of the valve core causes a certain channel to be blocked, the flow of refrigerant and other media is blocked. Since the refrigerant in the system is still being pushed continuously by the compressor, it cannot smoothly pass through the blocked port to enter the subsequent pipeline, and it will gather in front of the blocked position, causing pressure build-up. The pressure will continue to increase with the continuous supply of refrigerant, which may cause the system to shut down due to excessive pressure at the moment, or trigger an overpressure fault alarm. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a vehicle air-conditioning system and a control method for a two-position three-way reversing valve thereof, so as to avoid the problem of pressure build-up in the air-conditioning system.

[0005] In a first aspect, the present application provides a vehicle air conditioning system, comprising: A compressor, wherein the output end of the compressor is used to output refrigerant; the output end of the compressor is connected to a first pipeline, a two-position three-way reversing valve is arranged in the first pipeline, and a valve seat of the two-position three-way reversing valve is provided with a first opening and a second opening along its radial direction; The first opening is connected to the input end of the outdoor condenser, the output end of the outdoor condenser is connected to the input end of the cooler, the output end of the cooler is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected to the input end of the compressor; the compressor, the outdoor condenser, the cooler and the gas-liquid separator are connected in series in sequence to form a first branch; The second opening is connected to the input end of the indoor condenser, the output end of the indoor condenser is sequentially connected to a cooler and a gas-liquid separator shared with the first branch, and the compressor, the indoor condenser, the cooler and the gas-liquid separator are sequentially connected in series to form a second branch; The valve core of the two-position three-way reversing valve has a first flow channel, a second flow channel and a third flow channel that are interconnected, the first flow channel is connected to a refrigerant inlet, the second flow channel is connected to a first refrigerant outlet, and the third flow channel is connected to a second refrigerant outlet; the two-position three-way reversing valve has a first state and a second state, in the first state, the first refrigerant outlet is aligned and connected with the first opening, and the second refrigerant outlet is blocked from the second opening, so that the refrigerant flows through the first branch; in the second state, the second refrigerant outlet is aligned and connected with the second opening, and the first refrigerant outlet is blocked from the first opening, so that the refrigerant flows through the second branch; Among them, the refrigerant inlet is connected to the first pipeline and remains normally open, the axial angle θ between the second flow channel and the third flow channel is 80°≤θ≤100°, and during the switching process between the first state and the second state, the refrigerant can always flow in the flow channel of the two-position three-way reversing valve.

[0006] According to the technical solution provided in the embodiment of the present application, the two-position three-way reversing valve comprises: A housing, wherein the housing has a first space, and a driving element is installed in the first space; the driving element is used to switch the two-position three-way reversing valve between the first state and the second state; A valve core, the valve core is connected to the output end of the driving element and is coaxially arranged with the shell, the valve core has the second flow channel and the third flow channel connected to each other along its radial direction, the end of the second flow channel away from the third flow channel is the first refrigerant outlet, the end of the third flow channel away from the second flow channel is the second refrigerant outlet, the second flow channel and the third flow channel are both connected to the refrigerant inlet, and the axis of the first flow channel is perpendicular to the plane where the axes of the second flow channel and the third flow channel are located; The first opening and the second opening are respectively provided with sealing rings, and the size of the sealing ring at the first opening is larger than the size of the first refrigerant outlet, and the size of the sealing ring at the second opening is larger than the size of the second refrigerant outlet; In the first state, the second refrigerant outlet is blocked by the valve seat; in the second state, the first refrigerant outlet is blocked by the valve seat.

[0007] According to the technical solution provided in the embodiment of the present application, the output end of the indoor condenser is also connected to the outdoor condenser shared with the first branch, and the output end of the outdoor condenser is connected to the input end of the cooler; the compressor, the indoor condenser, the outdoor condenser, the cooler and the gas-liquid separator are connected in series in sequence to form a third branch.

[0008] According to the technical solution provided in the embodiment of the present application, a normally closed refrigeration solenoid valve is provided on the third branch between the indoor condenser and the outdoor condenser.

[0009] According to the technical solution provided in the embodiment of the present application, on the second branch, a heating solenoid valve in a normally open state is provided between the indoor condenser and the cooler.

[0010] According to the technical solution provided in the embodiment of the present application, it also includes an evaporator, the output end of the outdoor condenser is also connected to the input end of the evaporator, and the output end of the evaporator is connected to the input end of the outdoor condenser; the compressor, the outdoor condenser, the evaporator and the gas-liquid separator are connected in series in sequence to form a fourth branch.

[0011] According to the technical solution provided in the embodiment of the present application, a first one-way valve is provided between the outdoor condenser and the evaporator.

[0012] According to the technical solution provided in the embodiment of the present application, the outdoor condenser also has a radiator.

[0013] In a second aspect, the present application provides a control method for a two-position three-way reversing valve of a vehicle air-conditioning system, which is used to control the two-position three-way reversing valve in the vehicle air-conditioning system as described above; the method comprises the following steps: After receiving the power-on signal of the vehicle, it is determined in real time whether the two-position three-way reversing valve is suspected of being blocked; If the two-position three-way reversing valve is suspected of being blocked, a target initialization instruction is sent to the two-position three-way reversing valve, and it is determined whether the two-position three-way reversing valve can complete initialization according to the target initialization instruction; If yes, re-output the previous operation instruction, and if the valve core rotates normally to the target operation angle corresponding to the previous operation instruction, it is determined that the two-position three-way reversing valve is normal; if not, the suspected stall is determined to be stalled, and an alarm message indicating that the two-position three-way reversing valve is stalled is output; Among them, the previous operating instruction is the operating instruction output most recently before the suspected jam occurred in the two-position three-way reversing valve, and the operating instruction is used to control the target operating angle corresponding to the rotation of the valve core, and the target operating angle refers to the angle at which the valve core rotates relative to the housing when the valve core is in the first state or the second state.

[0014] According to the technical solution provided in the embodiment of the present application, after re-outputting the previous operation instruction, the following steps are also included: If the valve core does not normally rotate to the target operating angle corresponding to the previous operating instruction, an alarm message indicating that the two-position three-way reversing valve is blocked is output.

[0015] Compared with the prior art, the beneficial effect of the present application is that: the vehicle air-conditioning system of the present invention adopts a two-position three-way reversing valve of a specific structure, and the two-position three-way reversing valve is installed in the first pipeline of the air-conditioning system. The valve seat of the two-position three-way reversing valve is provided with a first opening and a second opening along its radial direction, and the second flow channel and the third flow channel whose angle θ with the axis of the two-position three-way reversing valve is 80°≤θ≤100° jointly realize: the second flow channel and the third flow channel are always connected with the opening of the valve seat during the whole process of the valve core rotation. This structure makes the flow of the refrigerant a gradual process when switching between the first branch and the second branch, rather than being suddenly cut off or blocked. When the two-position three-way reversing valve starts to switch from the first state, the first refrigerant outlet is aligned and connected with the first opening, and the second refrigerant outlet is blocked with the second opening. In the process of switching to the second state, even if the first refrigerant outlet gradually reduces the degree of connection with the first opening, due to the double-flow channel structure of 80°≤θ≤100°, the refrigerant can flow to the second branch through the second refrigerant outlet with gradually increasing degree of connection. This structure ensures that during the switching process, the refrigerant always has a flow channel to flow, avoiding the situation where the two refrigerant outlets are completely blocked due to the valve core rotating to a certain position when switching between the first state and the second state, causing pressure buildup, thereby improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a vehicle air conditioning system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a two-position three-way reversing valve, a first opening and a second opening provided in an embodiment of the present application; Figure 3 A schematic structural diagram of two flow channels during the valve core turning process of a two-position three-way directional valve provided in an embodiment of the present application.

[0017] The text annotations in the figure represent: 1. Compressor; 2. Two-position three-way reversing valve; 21. Refrigerant inlet; 22. First refrigerant outlet; 23. Second refrigerant outlet; 24. Valve core; 25. Driving element; 3. Indoor condenser; 4. Evaporator; 5. Gas-liquid separator; 6. First branch; 7. Second branch; 8. Third branch; 9. Outdoor condenser; 10. Cooler; 11. First opening; 12. Second opening; 211. First flow channel; 221. Second flow channel; 231. Third flow channel. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] Example 1 As mentioned in the background technology, in view of the problems in the prior art, this application proposes a vehicle air conditioning system, please refer to Figure 1 As shown, including: A compressor 1, wherein the output end of the compressor 1 is used to output a refrigerant; the output end of the compressor 1 is connected to a first pipeline, a two-position three-way reversing valve 2 is arranged in the first pipeline, and a valve seat of the two-position three-way reversing valve 2 is provided with a first opening 11 and a second opening 12 along its radial direction; The first opening 11 is connected to the input end of the outdoor condenser 9, the output end of the outdoor condenser 9 is connected to the input end of the cooler 10, the output end of the cooler 10 is connected to the input end of the gas-liquid separator 5, and the output end of the gas-liquid separator 5 is connected to the input end of the compressor 1; the compressor 1, the outdoor condenser 9, the cooler 10 and the gas-liquid separator 5 are connected in series in sequence to form a first branch 6; The second opening 12 is connected to the input end of the indoor condenser 3, and the output end of the indoor condenser 3 is sequentially connected to the cooler 10 and the gas-liquid separator 5 shared with the first branch 6, and the compressor 1, the indoor condenser 3, the cooler 10 and the gas-liquid separator 5 are sequentially connected in series to form a second branch 7; The valve core 24 of the two-position three-way reversing valve 2 has a first flow channel 211, a second flow channel 221 and a third flow channel 231 which are interconnected, wherein the first flow channel 211 is connected to the refrigerant inlet 21, the second flow channel 221 is connected to the first refrigerant outlet 22, and the third flow channel 231 is connected to the second refrigerant outlet 23; the two-position three-way reversing valve 2 has a first state and a second state, wherein in the first state, the first refrigerant outlet 22 is aligned and connected with the first opening 11, and the second refrigerant outlet 23 is blocked from the second opening 12, so that the refrigerant flows through the first branch 6; in the second state, the second refrigerant outlet 23 is aligned and connected with the second opening 12, and the first refrigerant outlet 22 is blocked from the first opening 11, so that the refrigerant flows through the second branch 7; Among them, the refrigerant inlet 21 is connected to the first pipeline and remains normally open, the axial angle θ between the first flow channel 221 and the second flow channel 231 is 80°≤θ≤100°, and during the switching process between the first state and the second state, the refrigerant can always flow in the flow channel of the two-position three-way reversing valve 2.

[0021] Specifically, the first pipeline is a section of the pipeline in the thermal management system in which a two-position three-way reversing valve 2 is installed, and the first branch 6 is mainly used for the conventional refrigeration cycle of the vehicle air-conditioning system. After the refrigerant is output from the compressor 1, it enters the outdoor condenser 9 through the first opening 11. In the outdoor condenser 9, the refrigerant dissipates heat to the external environment to achieve preliminary cooling. Then, the refrigerant enters the cooler 10 for further cooling, so that the temperature and state of the refrigerant are more suitable for subsequent cycles. After passing through the cooler 10, the refrigerant enters the gas-liquid separator 5, and the gas-liquid separator 5 separates the gaseous and liquid parts of the refrigerant to ensure that the refrigerant returning to the compressor 1 is in good condition, thereby completing a refrigeration cycle and providing a refrigeration function for the vehicle.

[0022] Specifically, the second opening 12 is an opening connected to the second branch 7, and the opening positions of the first outlet 11 and the second outlet 12 on the valve seat are respectively adapted to the positions of the first refrigerant outlet 22 and the second refrigerant outlet 23 of the valve core of the two-position three-way reversing valve 2, and the second branch 7 is mainly used for the heating function of the vehicle air conditioning system. After the refrigerant is output from the compressor 1, it enters the indoor condenser 3 through the second opening 12. In the indoor condenser 3, the refrigerant releases heat to heat the air in the car. The normally open heating solenoid valve is located between the indoor condenser 3 and the cooler 10 to ensure that the refrigerant can pass through this part of the pipeline smoothly. Afterwards, the refrigerant passes through the cooler 10 and the gas-liquid separator 5 shared with the first branch 6, and returns to the compressor 1, forming a heating cycle to increase the temperature in the car.

[0023] For further information, please refer to Figure 2 As shown, the two-position three-way reversing valve 2 comprises: A housing, wherein the housing has a first space, wherein a driving element 25 is installed in the first space; the driving element 25 is used to switch the two-position three-way reversing valve 2 between the first state and the second state; A valve core 24, the valve core 24 is connected to the output end of the driving element 25 and is coaxially arranged with the housing, the valve core 24 has the second flow channel 221 and the third flow channel 231 which are interconnected along its radial direction, the end of the second flow channel 221 away from the third flow channel 231 is the first refrigerant outlet 22, the end of the third flow channel 231 away from the second flow channel 221 is the second refrigerant outlet 23, the second flow channel 221 and the third flow channel 231 are both connected to the refrigerant inlet 21, and the axis of the first flow channel 211 is perpendicular to the plane where the axes of the second flow channel 221 and the third flow channel 231 are located; The first opening 11 and the second opening 12 are respectively provided with sealing rings, and the size of the sealing ring at the first opening 11 is larger than the size of the first refrigerant outlet 22, and the size of the sealing ring at the second opening 12 is larger than the size of the second refrigerant outlet 23; Optionally, the first opening 11 and the second opening 12, the first refrigerant outlet 22 and the second refrigerant outlet 23 are all circular, and the sealing ring is embedded in the first opening and the second opening. The outer diameter of the sealing ring at the first opening 11 is larger than the first refrigerant outlet 22, and the outer diameter of the sealing ring at the second opening 12 is larger than the second refrigerant outlet 23, so that the rotation angle error has a larger redundant space for the valve sealing type, thereby improving the product qualification rate.

[0024] In the first state, the second refrigerant outlet 23 is blocked by the valve seat; in the second state, the first refrigerant outlet 22 is blocked by the valve seat.

[0025] Specifically, the driving element 25 can be selected as a stepper motor. When the two-position three-way reversing valve 2 is in the first state, the driving element 25 controls the position of the valve core 24 so that the first refrigerant outlet 22 is connected to the first opening 11, and the second refrigerant outlet 23 is blocked by the inner wall of the valve seat near the valve core 24. After the refrigerant is output from the compressor 1, it enters the outdoor condenser 9 through the first opening 11, flows through the cooler 10 and the gas-liquid separator 5 in sequence, and finally returns to the compressor 1 to complete the circulation of the first branch 6. When it is necessary to switch to the second state, the driving element 25 is activated to change the position of the valve core 24. At this time, the second refrigerant outlet 23 is connected to the second opening 12, and the first refrigerant outlet 22 is blocked by the inner wall of the valve seat. After the refrigerant is output from the compressor 1, it enters the indoor condenser 3 through the second opening 12, and then passes through the cooler 10 and the gas-liquid separator 5 to return to the compressor 1 to realize the circulation of the second branch 7. For the two-position three-way reversing valve 2, the reliability of the driving element 25 must be guaranteed, and it can accurately switch between the first state and the second state. At the same time, attention should be paid to the sealing of the valve core 24 to prevent the refrigerant from leaking in places where it should not flow.

[0026] The valve core 24 is connected to the output end of the driving element 25, and the valve core 24 is coaxially arranged with the housing. A second flow channel 221 and a third flow channel 231 are machined in the valve core 24 and are interconnected along the radial direction thereof, and the size and position of the through hole are ensured to be accurate, so that the end of the second flow channel 221 away from the third flow channel 231 can be used as the first refrigerant outlet 22, and the end of the third flow channel 231 away from the second flow channel 221 can be used as the second refrigerant outlet 23, and both the second flow channel 221 and the third flow channel 231 can be connected with the refrigerant inlet 21.

[0027] Specifically, the working principle of the two-position three-way reversing valve 2 is as follows: when the driving element 25 receives a switching signal, it drives the valve core 24 to rotate or move, thereby changing the positions of the first refrigerant outlet 22 and the second refrigerant outlet 23. In the first state, the driving element 25 controls the valve core 24 so that the second refrigerant outlet 23 is blocked by the valve seat, and the first refrigerant outlet 22 is connected to the first opening 11, so that the refrigerant flows through the first branch 6. In the second state, the driving element 25 controls the valve core 24 so that the first refrigerant outlet 22 is blocked by the valve seat, and the second refrigerant outlet 23 is connected to the second opening 12, so that the refrigerant flows through the second branch 7. The operating state of the vehicle air-conditioning system can be monitored by a sensor or other device, and when the branch needs to be switched, a signal is sent to the driving element 25 to achieve automatic switching. Alternatively, the driving element 25 can be controlled to switch the state of the two-position three-way reversing valve 2 according to actual needs by manual operation.

[0028] Specifically, the working principle of the two-position three-way reversing valve 2 to prevent the air conditioning system from being pressurized is as follows: the refrigerant inlet 21 of the two-position three-way reversing valve 2 of the present invention is coaxially arranged with the first pipeline and is kept open. This structural feature allows the refrigerant to continuously and stably enter the two-position three-way reversing valve 2. Regardless of the state of the two-position three-way reversing valve 2, the refrigerant has a flow channel (such as Figure 3As shown, a and d are the positions of the second flow channel 221 and the third flow channel 231 of the valve core 24 in the first state and the second state respectively. In these two states, the refrigerant flows out from the first opening 11 and the second opening 12 respectively. b and c are process diagrams from the first state to the second state. It can be seen from these two figures that even in the rotation process, the refrigerant in the flow channel will always have an area connected to the first opening 11 or the second opening 12), which provides a basic flow guarantee for preventing pressure build-up later. At the same time, the axis angle between the second flow channel 221 and the third flow channel 231 is 90°±5°, and the two openings on the valve seat are matched. This structural design is the key to preventing pressure holding. In the process of the two-position three-way reversing valve 2 switching from the first state to the second state (or vice versa), due to the dual-channel structure and the specific angle setting, the valve core 24 flow channel is always connected with the first opening 11 or the second opening 12. Assuming that the refrigerant enters the two-position three-way reversing valve 2 from the refrigerant inlet 21 at a certain pressure and flow rate, when the valve core 24 rotates, the dual-hole structure is like a "transition bridge". If there is no such structure, when one outlet is blocked by the valve seat, the refrigerant will have nowhere to go and will be held back. However, in the present invention, the refrigerant can flow out through another outlet that is opening, ensuring that the flow path of the refrigerant is always unobstructed. Moreover, this structure makes the flow of the refrigerant a gradual process when the first branch 6 and the second branch 7 are switched, rather than being suddenly cut off or blocked. When the refrigerant switches from the first branch 6 to the second branch 7, the connection between the first refrigerant outlet 22 and the first opening 11 is blocked, while the connection between the second refrigerant outlet 23 and the second opening 12 is established. The refrigerant can be smoothly transferred from the first branch 6 to the second branch 7, without causing impact on the valve core and generating noise due to sudden blockage, and avoiding the situation where the system is shut down due to instantaneous excessive pressure due to pressure build-up, or falsely reporting an overpressure fault.

[0029] Specifically, the two-position three-way reversing valve 2 of the present invention has other advantages over the prior art: as mentioned in the background technology, when the refrigerant flow direction is switched, there is no stable transition mechanism, and the refrigerant may suddenly change its flow direction in a short time, and quickly enter another temperature environment from one temperature environment. For example, when switching from the heating branch to the cooling branch, due to the lack of a smooth transition structure, the high-temperature refrigerant may suddenly be cut off from flowing, and the low-temperature refrigerant quickly enters, causing the local temperature of the valve core 24 and the valve body and other components to change sharply, thereby generating a sudden cold and hot shock, which easily leads to deformation and leakage of the components. The refrigerant inlet 21 of the two-position three-way reversing valve 2 of the present invention is coaxially arranged with the first pipeline and remains normally connected, which enables the refrigerant to continuously and stably enter the two-position three-way reversing valve 2. During the reversing process, there will be no sudden interruption of the supply of refrigerant, thereby reducing the temperature mutation caused by the unstable supply of refrigerant. For example, when switching from the first branch 6 to the second branch 7, since the refrigerant inlet 21 has always had refrigerant entering, it can buffer the temperature change to a certain extent and avoid sudden cold and hot. Moreover, the axis angle between the first flow channel 221 and the second flow channel 231 is 90°±5°. This structural design enables the refrigerant to change its flow direction at a relatively gentle angle during the reversing process. When the refrigerant switches from one outlet to another, there will be no sharp turn in the refrigerant flow direction. For example, when switching between cooling and heating modes, the refrigerant can be relatively smoothly transferred from the first refrigerant outlet 22 leading to the outdoor condenser 9 to the second refrigerant outlet 23 leading to the indoor condenser 3, reducing the temperature shock caused by the sudden change in the refrigerant flow direction. When the two-position three-way reversing valve 2 is used in the vehicle air-conditioning system, it works in conjunction with the compressor 1, the condenser, the cooler 10 and other components. Its structural characteristics can better adapt to the refrigerant cycle of the entire system. When the two-position three-way reversing valve 2 switches its state, the conversion of the refrigerant between the first branch 6 and the second branch 7 can be further reduced by the buffering effect of other components in the system, such as the adjustment of the refrigerant temperature and state by the cooler 10 and the gas-liquid separator 5, thereby further reducing the sudden cold and hot shock.

[0030] It should be noted that the central axes of the three outlets, namely the refrigerant inlet 21, the first refrigerant outlet 22 and the second refrigerant outlet 23, are perpendicular to each other (approximately perpendicular, with an allowable error range of ±5°). When the two-position three-way reversing valve 2 switches between the first state and the second state, the central axis position of the refrigerant inlet 21 remains unchanged, and the first refrigerant outlet 22 and the second refrigerant outlet 23 rotate around the central axis of the refrigerant inlet 21, and during the rotation process, at least one outlet is connected to the opening on the corresponding valve seat at any time.

[0031] In a preferred embodiment, the output end of the indoor condenser 3 is also connected to the outdoor condenser 9 shared with the first branch 6, and the output end of the outdoor condenser 9 is connected to the input end of the cooler 10; the compressor 1, the indoor condenser 3, the outdoor condenser 9, the cooler 10 and the gas-liquid separator 5 are connected in series in sequence to form a third branch 8.

[0032] Specifically, the third branch 8 provides a mode for enhanced cooling. After being output from the compressor 1, the refrigerant first enters the indoor condenser 3, where a preliminary heat exchange is performed. When the normally closed refrigeration solenoid valve located between the indoor condenser 3 and the outdoor condenser 9 is opened, the refrigerant enters the outdoor condenser 9 for further heat dissipation. Then, the refrigerant returns to the compressor 1 through the cooler 10 and the gas-liquid separator 5. This mode may be used when rapid cooling is required or when the temperature inside the vehicle is high and a stronger cooling effect is required. The cooling efficiency is improved by continuous cooling of the two condensers (indoor and outdoor).

[0033] In a preferred embodiment, a normally closed refrigeration solenoid valve is provided on the third branch 8 between the indoor condenser 3 and the outdoor condenser 9 .

[0034] Specifically, on the third branch 8, a refrigeration solenoid valve is installed at a suitable position between the indoor condenser 3 and the outdoor condenser 9. Normally, the refrigeration solenoid valve is in a normally closed state. When it is necessary to start the third branch 8 for a specific refrigeration operation, a signal is sent to the refrigeration solenoid valve through the control system to open it and allow the refrigerant to pass through. When the third branch 8 is not needed to work, the refrigeration solenoid valve remains closed to prevent the refrigerant from flowing on the branch.

[0035] In a preferred embodiment, a normally open heating solenoid valve is provided on the second branch 7 between the indoor condenser 3 and the cooler 10 .

[0036] Specifically, a heating solenoid valve is installed at a suitable position between the indoor condenser 3 and the cooler 10 on the second branch 7. The heating solenoid valve is in a normally open state. When the second branch 7 is working, the refrigerant is output from the compressor 1, enters the indoor condenser 3, and then flows smoothly to the cooler 10 while the heating solenoid valve remains open. If it is necessary to adjust the refrigerant flow of the second branch 7 or close the branch under certain circumstances, the heating solenoid valve can be controlled by the control system to close it or adjust its opening.

[0037] In a preferred embodiment, it also includes an evaporator 4, the output end of the outdoor condenser 9 is also connected to the input end of the evaporator 4, and the output end of the evaporator 4 is connected to the input end of the outdoor condenser 9; the compressor 1, the outdoor condenser 9, the evaporator 4 and the gas-liquid separator 5 are connected in series in sequence to form a fourth branch.

[0038] Specifically, the fourth branch is mainly used for special refrigeration or heat recovery functions of the vehicle air conditioning system. After the refrigerant is output from the compressor 1, it enters the outdoor condenser 9 for heat exchange. After that, the refrigerant enters the evaporator 4 through the first one-way valve, where the refrigerant evaporates and absorbs heat. This process can achieve additional refrigeration effect or recycle some heat. Finally, the refrigerant returns to the compressor 1 through the gas-liquid separator 5 to complete this special cycle.

[0039] In a preferred embodiment, a first one-way valve is provided between the outdoor condenser 9 and the evaporator 4 .

[0040] Specifically, a first one-way valve is installed at a suitable position between the outdoor condenser 9 and the evaporator 4 to ensure that the installation direction is correct. The first one-way valve allows the refrigerant to flow from the outdoor condenser 9 to the evaporator 4 in one direction to prevent the refrigerant from flowing in the opposite direction. In this way, the refrigerant in the fourth branch can flow in a specific direction to ensure the normal operation of the system.

[0041] In a preferred embodiment, the outdoor condenser 9 also has a radiator.

[0042] Specifically, the radiator is mounted on the outdoor condenser 9, and a suitable fixing method can be used to ensure that the radiator is in close contact with the outdoor condenser 9 to achieve good heat transfer. When the outdoor condenser 9 is working, the radiator also works. The radiator can help the outdoor condenser 9 to dissipate heat better and improve the heat exchange efficiency. The radiator can dissipate the heat generated by the outdoor condenser 9 to the surrounding environment through natural convection, forced air cooling or other heat dissipation methods, ensuring that the temperature of the outdoor condenser 9 is maintained within a suitable range, thereby improving the performance and reliability of the entire vehicle air conditioning system.

[0043] Example 2 This embodiment provides a control method for a two-position three-way reversing valve 2 of a vehicle air conditioning system, which is used to control the two-position three-way reversing valve 2 in the vehicle air conditioning system as provided in Embodiment 1; the method comprises the following steps: S1, after receiving the power-on signal of the vehicle, determining in real time whether the two-position three-way reversing valve 2 is suspected of being blocked; Specifically, the stepper motor drives the valve core 24 of the two-position three-way reversing valve 2 to rotate to change the state of the two-position three-way reversing valve 2. Switching back and forth between the first state and the second state corresponds to a target pulse number; The real-time determination of whether the two-position three-way reversing valve 2 is suspected of being blocked specifically includes the following steps: The number of pulse signals of the stepper motor is obtained in real time. If the number of pulse signals does not change within the first preset time period and the number of pulse signals does not reach the target number of pulses, it is determined that the two-position three-way reversing valve 2 is suspected to be blocked; if the number of pulse signals changes within the first preset time period and the number of pulse signals reaches the target number of pulses after the first preset time period, it is determined that the two-position three-way reversing valve 2 is normal.

[0044] Specifically, the target number of pulses corresponding to the first state to the second state is equal to the target number of pulses corresponding to the second state to the first state. For example, the required rotation angle from the first state to the second state is 90 degrees. After the vehicle is powered on, the system starts to monitor the state of the two-position three-way reversing valve 2 in real time. For a stepper motor with a step angle of 1°, if the rotation angle is 90°, the required number of pulses = 90°÷1°=90 pulses. Therefore, it takes about 90 pulses to turn from the first state to the second state. From the first state to the second state, assuming that the rotation is completed within the first preset time (5 seconds) under normal circumstances, the pulse number range is 90. If after 5 seconds, the number of pulse signals is less than 90 and has not changed, it can be determined as suspected stalling, resulting in the inability to receive pulse signals normally to complete the rotation.

[0045] S2, if the two-position three-way reversing valve 2 is suspected of being blocked, sending a target initialization instruction to the two-position three-way reversing valve 2, and determining whether the two-position three-way reversing valve 2 can complete initialization according to the target initialization instruction; Specifically, the target initialization instruction may be a set of specific parameters or signals for attempting to restart or adjust the state of the two-position three-way directional valve 2 .

[0046] S3, if yes, re-output the previous operation instruction, if the valve core 24 rotates normally to the target operation angle corresponding to the previous operation instruction, it is determined that the two-position three-way reversing valve 2 is normal; if not, the suspected stall is determined to be stalled, and an alarm message indicating that the two-position three-way reversing valve 2 is stalled is output; Among them, the previous operating instruction is the operating instruction output most recently before the suspected jam occurred in the two-position three-way reversing valve 2, and the operating instruction is used to control the valve core 24 to rotate to a corresponding target operating angle, and the target operating angle refers to the angle at which the valve core 24 rotates relative to the housing when the valve core 24 is in the first state or the second state.

[0047] Specifically, if the initialization can be completed, it means that the valve may have resumed normal working conditions with the assistance of the target initialization instruction. At this time, the previous operation instruction is re-output. If the valve core 24 rotates normally to the target operation angle corresponding to the previous operation instruction, it is determined that the two-position three-way reversing valve 2 has indeed returned to normal. This shows that after processing, the valve has resumed its normal working state and can continue to operate according to the preset program. On the contrary, if the valve core 24 fails to complete the initialization according to the target initialization instruction, it means that the suspected stall cannot be restored by initialization and other operations. It is a real stall, and an alarm message needs to be output. The alarm message can be notified to the user or maintenance personnel through a display screen, sound or other means, so that timely measures can be taken for repair or replacement.

[0048] Specifically, the previous operating instruction can be the total number of pulse signals and the total duration required for the control valve core 24 to rotate from the initialization position (generally the position of the first state, that is, the position where the first refrigerant outlet 22 is aligned with the first opening 11) to the corresponding target operating angle, for example 90 pulse signals within 5 seconds. The previous operating instruction can be re-output directly, and the first actual pulse number of the stepper motor is read after the preset duration. If the first actual pulse number is equal to the total pulse signal number, it is determined that the valve core 24 has normally rotated to the target operating angle corresponding to the previous operating instruction.

[0049] Furthermore, after re-outputting the previous operation instruction, the following steps are also included: If the valve core 24 does not normally rotate to the target operating angle corresponding to the previous operating instruction, an alarm message indicating that the two-position three-way reversing valve 2 is blocked is output.

[0050] Specifically, if the first actual number of revolutions is less than the total number of revolutions of the rotor, it is determined that the valve core 24 has not normally rotated to the target operating angle corresponding to the previous operating instruction.

[0051] The control method proposed in this embodiment can also improve the control stability based on the double-through-hole structure of the two-position three-way reversing valve 2 of embodiment 1, specifically: when the control method detects a suspected stalling stage, this double-through-hole structure can maintain the basic circulation of the refrigerant to a certain extent. For example, even if the valve core 24 is partially blocked due to suspected stalling, due to the existence of the double-through-hole structure, the refrigerant still has the opportunity to flow to the corresponding branch through one of the through holes. This avoids the sudden change of system pressure or temperature out of control caused by the complete inability of the refrigerant to flow during the fault detection and preliminary processing stage, and provides a certain buffer for the system. In addition, after the initialization and other operations of the control method, the two-position three-way reversing valve 2 resumes normal operation. The double-through-hole structure can better cooperate with the control method, so that when the valve core 24 is rotated to the target operating angle again, the refrigerant can smoothly switch between the first refrigerant outlet 22 and the second refrigerant outlet 23. For example, when switching between cooling and heating modes, the dual through-hole structure ensures that the refrigerant will not experience a sudden change in flow direction because the valve core 24 has just resumed normal rotation, reducing the impact on the system, allowing the refrigerant to circulate smoothly in different branches according to control instructions, thereby ensuring the stable operation of the vehicle air-conditioning system.

[0052] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A vehicle air conditioning system, characterized in that: include: A compressor (1), wherein an output end of the compressor (1) is used to output a refrigerant; the output end of the compressor (1) is connected to a first pipeline, a two-position three-way reversing valve (2) is arranged in the first pipeline, and a valve seat of the two-position three-way reversing valve (2) is provided with a first opening (11) and a second opening (12) along its radial direction; The first opening (11) is connected to the input end of the outdoor condenser (9), the output end of the outdoor condenser (9) is connected to the input end of the cooler (10), the output end of the cooler (10) is connected to the input end of the gas-liquid separator (5), and the output end of the gas-liquid separator (5) is connected to the input end of the compressor (1); the compressor (1), the outdoor condenser (9), the cooler (10) and the gas-liquid separator (5) are connected in series in sequence to form a first branch (6); The second opening (12) is connected to the input end of the indoor condenser (3); the output end of the indoor condenser (3) is connected in sequence to a cooler (10) and a gas-liquid separator (5) shared with the first branch (6); the compressor (1), the indoor condenser (3), the cooler (10) and the gas-liquid separator (5) are connected in series in sequence to form a second branch (7); The valve core (24) of the two-position three-way reversing valve (2) has a first flow channel (211), a second flow channel (221) and a third flow channel (231) which are interconnected, wherein the first flow channel (211) is connected to the refrigerant inlet (21), the second flow channel (221) is connected to the first refrigerant outlet (22), and the third flow channel (231) is connected to the second refrigerant outlet (23); the two-position three-way reversing valve (2) has a first state and a second state, wherein in the first state, the first refrigerant outlet (22) is aligned and connected to the first opening (11), and the second refrigerant outlet (23) is blocked from the second opening (12), so that the refrigerant flows through the first branch (6); in the second state, the second refrigerant outlet (23) is aligned and connected to the second opening (12), and the first refrigerant outlet (22) is blocked from the first opening (11), so that the refrigerant flows through the second branch (7); The refrigerant inlet (21) is connected to the first pipeline and remains normally open, the axis angle θ between the second flow channel (221) and the third flow channel (231) is 80°≤θ≤100°, and during the switching process between the first state and the second state, the refrigerant can always flow in the flow channel of the two-position three-way reversing valve (2).

2. The vehicle air conditioning system according to claim 1, characterized in that: The two-position three-way reversing valve (2) comprises: A housing, wherein the housing has a first space, and a driving element (25) is installed in the first space; the driving element (25) is used to switch the two-position three-way reversing valve (2) between the first state and the second state; A valve core (24), the valve core (24) being connected to the output end of the driving element (25) and being coaxially arranged with the shell, the valve core (24) having the second flow channel (221) and the third flow channel (231) being interconnected along its radial direction, the end of the second flow channel (221) away from the third flow channel (231) being the first refrigerant outlet (22), the end of the third flow channel (231) away from the second flow channel (221) being the second refrigerant outlet (23), the second flow channel (221) and the third flow channel (231) being both connected to the refrigerant inlet (21), and the axis of the first flow channel (211) being perpendicular to the plane where the axes of the second flow channel (221) and the third flow channel (231) are located; The first opening (11) and the second opening (12) are respectively provided with sealing rings, and the size of the sealing ring at the first opening (11) is larger than the size of the first refrigerant outlet (22), and the size of the sealing ring at the second opening (12) is larger than the size of the second refrigerant outlet (23); In the first state, the second refrigerant outlet (23) is blocked by the valve seat; in the second state, the first refrigerant outlet (22) is blocked by the valve seat.

3. The vehicle air conditioning system according to claim 2, characterized in that: The output end of the indoor condenser (3) is also connected to the outdoor condenser (9) shared with the first branch (6), and the output end of the outdoor condenser (9) is connected to the input end of the cooler (10); the compressor (1), the indoor condenser (3), the outdoor condenser (9), the cooler (10) and the gas-liquid separator (5) are connected in series in sequence to form a third branch (8).

4. The vehicle air conditioning system according to claim 3, characterized in that: On the third branch (8), a refrigeration solenoid valve in a normally closed state is provided between the indoor condenser (3) and the outdoor condenser (9).

5. The vehicle air conditioning system according to claim 2, characterized in that: On the second branch (7), a heating solenoid valve in a normally open state is provided between the indoor condenser (3) and the cooler (10).

6. The vehicle air conditioning system according to claim 2, characterized in that: It also includes an evaporator (4), the output end of the outdoor condenser (9) is also connected to the input end of the evaporator (4), and the output end of the evaporator (4) is connected to the input end of the outdoor condenser (9); the compressor (1), the outdoor condenser (9), the evaporator (4) and the gas-liquid separator (5) are connected in series in sequence to form a fourth branch.

7. The vehicle air conditioning system according to claim 6, characterized in that: A first one-way valve is provided between the outdoor condenser (9) and the evaporator (4).

8. The vehicle air conditioning system according to claim 2, characterized in that: The outdoor condenser (9) is also provided with a radiator.

9. A control method for a two-position three-way reversing valve of a vehicle air conditioning system, used to control the two-position three-way reversing valve in the vehicle air conditioning system according to any one of claims 2 to 7; characterized in that: The following steps are involved: After receiving a power-on signal from the vehicle, determining in real time whether the two-position three-way reversing valve (2) is suspected of being blocked; If the two-position three-way reversing valve (2) is suspected of being blocked, a target initialization instruction is sent to the two-position three-way reversing valve (2), and it is determined whether the two-position three-way reversing valve (2) can complete initialization according to the target initialization instruction; If so, the previous operation instruction is re-outputted, and if the valve core (24) rotates normally to the target operation angle corresponding to the previous operation instruction, it is determined that the two-position three-way reversing valve (2) is normal; If not, the suspected stall is determined to be a stall, and an alarm message indicating that the two-position three-way reversing valve (2) is stalled is output; The previous operation instruction is the operation instruction output most recently before the suspected jam of the two-position three-way reversing valve (2) occurs, and the operation instruction is used to control the valve core (24) to rotate to a corresponding target operation angle, and the target operation angle refers to the angle at which the valve core (24) rotates relative to the housing when the valve core (24) is in the first state or the second state.

10. The control method of the two-position three-way reversing valve of the vehicle air conditioning system according to claim 9, characterized in that: After re-outputting the previous operation instruction, the following steps are also included: If the valve core (24) does not normally rotate to the target operating angle corresponding to the previous operating instruction, an alarm message indicating that the two-position three-way reversing valve (2) is blocked is output.

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