A vehicle air conditioning system and a control method for a two-position three-way reversing valve thereof

Abstract

The present application provides a vehicle air-conditioning system and a control method for a two-position three-way reversing valve thereof, comprising: a compressor output end is connected to a first pipe, a two-position three-way reversing valve is provided in the first pipe, and a valve seat thereof is provided with a first opening and a second opening; the first opening is connected to the input end of the outdoor condenser and forms a first branch; the second opening is connected to the input end of the indoor condenser and forms 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 the refrigerant inlet, the second flow channel is connected to the first refrigerant outlet, and the third flow channel is connected to the second refrigerant outlet; the refrigerant inlet is connected to the first pipe and remains normally open, and the axial angle θ between the second flow channel and the third flow channel is 80°≤θ≤100°. During the process of switching the refrigerant outlet, the refrigerant can always circulate in the flow channel of the two-position three-way reversing valve to prevent instantaneous pressure build-up during the reversing process and improve the stability of the air-conditioning system.

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 for vehicle air conditioning systems are becoming increasingly demanding. In traditional vehicle air conditioning systems, the structural design of the reversing valve often has some problems, which can cause pressure buildup 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, during the flow path diversion process of this reversing valve, when the position change of the valve core causes a certain channel to be blocked, the flow of media such as refrigerant is blocked. Since the refrigerant in the system is still being pushed continuously by the compressor, it cannot pass through the blocked port smoothly into the subsequent pipeline, and will gather in front of the blocked position, thereby causing pressure buildup. The pressure will continue to rise with the continuous supply of refrigerant, which may cause the system to shut down due to instantaneous excessive pressure, 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:

[0006] 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 pipe, a two-position three-way reversing valve is disposed in the first pipe, and the valve seat of the two-position three-way reversing valve is radially defined with a first opening and a second opening;

[0007] 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;

[0008] 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;

[0009] 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 the refrigerant inlet, the second flow channel is connected to the first refrigerant outlet, and the third flow channel is connected to the 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 with the first opening and is connected, 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 with the second opening and is connected, and the first refrigerant outlet is blocked from the first opening, so that the refrigerant flows through the second branch;

[0010] In which, 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.

[0011] According to the technical solution provided in the embodiment of the present application, the two-position three-way reversing valve includes:

[0012] A housing having a first space therein, wherein 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;

[0013] A valve core, the valve core is connected to the output end of the driving element and is coaxially arranged with the housing, 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;

[0014] The first opening and the second opening are respectively provided with a sealing ring, 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;

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] According to the technical solution provided in the embodiment of the present application, the outdoor condenser also has a radiator.

[0022] In a second aspect, the present application provides a control method for a two-position three-way reversing valve in a vehicle air conditioning system, for controlling the two-position three-way reversing valve in the vehicle air conditioning system as described above; the method comprises the following steps:

[0023] 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;

[0024] 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;

[0025] If so, re-output the previous operation instruction. 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;

[0026] Among them, the previous operating instruction is the operating instruction output most recently before the suspected jam occurs 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. 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.

[0027] According to the technical solution provided in the embodiment of the present application, after re-outputting the previous run instruction, the following steps are further included:

[0028] 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.

[0029] 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 with a specific structure, which is installed in the first pipe 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. The second flow channel and the third flow channel, which have an angle θ of 80°≤θ≤100° with the axis of the two-position three-way reversing valve, jointly realize that: during the entire rotation process of the valve core, the second flow channel and the third flow channel are always connected with the opening of the valve seat. This structure makes the flow of 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 from the second opening. During the transition to the second state, even if the first refrigerant outlet gradually reduces the degree of connection with the first opening, due to the dual-flow channel structure of 80°≤θ≤100°, the refrigerant can flow to the second branch through the second refrigerant outlet which gradually increases the 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, resulting in pressure buildup, thereby improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a vehicle air conditioning system provided in an embodiment of the present application;

[0031] Figure 2 A schematic structural diagram of a two-position three-way reversing valve, a first opening, and a second opening provided in an embodiment of the present application;

[0032] Figure 3 This is a schematic structural diagram of the two flow channels during the valve core turning process of the two-position three-way reversing valve provided in an embodiment of the present application.

[0033] The text annotations in the figure represent:

[0034] 1. Compressor; 2. Two-position three-way reversing valve; 21. Refrigerant inlet; 22. First refrigerant outlet; 23. Second refrigerant outlet; 24. Valve core; 25. Drive 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

[0035] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0037] Example 1

[0038] As mentioned in the background technology, in order to solve the problems in the prior art, this application proposes a vehicle air conditioning system. Figure 1 Shown, including:

[0039] A compressor 1, wherein the output end of the compressor 1 is used to output refrigerant; the output end of the compressor 1 is connected to a first pipe, in which a two-position three-way reversing valve 2 is disposed, and the valve seat of the two-position three-way reversing valve 2 is radially defined with a first opening 11 and a second opening 12;

[0040] 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;

[0041] 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. 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;

[0042] 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 that are interconnected. 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. In the first state, the first refrigerant outlet 22 is aligned with and communicates 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 with and communicates 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.

[0043] Among them, the refrigerant inlet 21 is connected to the first pipeline and remains normally open, and the axial angle θ between the first flow channel 221 and the second flow channel 231 is 80°≤θ≤100°. 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.

[0044] Specifically, the first pipeline is a section of 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, which 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.

[0045] Specifically, the second opening 12 is an opening connected to the second branch 7. 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. 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 inside the vehicle. 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 inside the vehicle.

[0046] For further information, please refer to Figure 2 As shown, the two-position three-way reversing valve 2 includes:

[0047] A housing having a first space therein, 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;

[0048] 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 that are connected to each other 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, and 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. 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;

[0049] The first opening 11 and the second opening 12 are respectively provided with a sealing ring, 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;

[0050] 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.

[0051] 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.

[0052] Specifically, the drive element 25 can be a stepper motor. When the two-position, three-way reversing valve 2 is in the first state, the drive element 25 controls the position of the valve core 24, causing the first refrigerant outlet 22 to communicate with the first opening 11. At this point, the second refrigerant outlet 23 is blocked by the inner wall of the valve seat near the valve core 24. After being discharged from the compressor 1, the refrigerant enters the outdoor condenser 9 through the first opening 11, flows through the cooler 10 and the gas-liquid separator 5, and finally returns to the compressor 1, completing the circulation of the first branch 6. When it is necessary to switch to the second state, the drive element 25 is activated, changing the position of the valve core 24. At this point, the second refrigerant outlet 23 communicates with the second opening 12, while the first refrigerant outlet 22 is blocked by the inner wall of the valve seat. After being discharged from the compressor 1, the refrigerant enters the indoor condenser 3 through the second opening 12, then passes through the cooler 10 and the gas-liquid separator 5 and returns to the compressor 1, completing the circulation of the second branch 7. For the two-position, three-way reversing valve 2, the reliability of the drive element 25 must be ensured to ensure accurate switching between the first and second states. 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.

[0053] Connect the valve core 24 to the output end of the drive element 25, ensuring that the valve core 24 is coaxial with the housing. A second flow channel 221 and a third flow channel 231 are machined into the valve core 24, interconnected along its radial direction. Ensure that the through-holes are accurately sized and positioned so that the end of the second flow channel 221 away from the third flow channel 231 can serve as the first refrigerant outlet 22, and the end of the third flow channel 231 away from the second flow channel 221 can serve as the second refrigerant outlet 23. Furthermore, both the second flow channel 221 and the third flow channel 231 can communicate with the refrigerant inlet 21.

[0054] 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 position 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 status of the vehicle air-conditioning system can be monitored by sensors and other devices. When it is necessary to switch branches, 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 through manual operation.

[0055] 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 pipe 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 3 As 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 for turning from the first state to the second state. It can be seen from these two figures that even during 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 basic flow guarantee for subsequent prevention of pressure build-up. At the same time, the axis angle between the second flow channel 221 and the third flow channel 231 is 90°±5°, and they match the two openings on the valve seat. This structural design is the key to preventing pressure buildup. During 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 to 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 acts like a "transition bridge". Without this structure, when one outlet is blocked by the valve seat, the refrigerant will have nowhere to go and will be pressured. However, in the present invention, the refrigerant can flow out through the other opening outlet, ensuring that the refrigerant flow path 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 noise due to sudden blockage. This also avoids the situation where the system shuts down due to instantaneous excessive pressure or false overpressure faults due to pressure buildup.

[0056] Specifically, the two-position, three-way reversing valve 2 of the present invention has other advantages over the prior art: For example, when the multi-way valve mentioned in the background art switches the refrigerant flow direction, there is no stable transition mechanism, which may cause the refrigerant to suddenly change direction in a short period of time, rapidly entering one temperature environment from another. 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 be suddenly cut off from the flow, and the low-temperature refrigerant may quickly enter, causing the local temperature of components such as the valve core 24 and the valve body to change dramatically, resulting in sudden cooling and heating shocks, which can easily lead to deformation and leakage of components. However, 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 open, which allows refrigerant to enter the two-position, three-way reversing valve 2 continuously and stably. During the switching process, there will be no sudden interruption of the refrigerant supply, thereby reducing the temperature fluctuations caused by unstable refrigerant supply. For example, when switching from the first branch 6 to the second branch 7, because refrigerant is continuously entering the refrigerant inlet 21, it can buffer the temperature changes to a certain extent and avoid sudden cooling and heating. Moreover, the angle between the axes of 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, condenser, cooler 10 and other components. Its structural features 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 cooler 10 and the gas-liquid separator 5 on the refrigerant temperature and state, thereby further reducing the sudden cooling and heating shock.

[0057] It should be noted that the central axes of the three outlets, 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 any time at least one outlet is connected to the opening on the corresponding valve seat.

[0058] 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.

[0059] Specifically, the third branch 8 provides an enhanced cooling mode. After exiting compressor 1, the refrigerant first enters indoor condenser 3, where initial heat exchange occurs. When the normally closed cooling solenoid valve between indoor condenser 3 and outdoor condenser 9 opens, the refrigerant enters outdoor condenser 9 for further heat dissipation. The refrigerant then passes through cooler 10 and gas-liquid separator 5 and returns to compressor 1. This mode may be used when rapid cooling is required or when higher vehicle temperatures require a stronger cooling effect. By continuously cooling both condensers (indoor and outdoor), cooling efficiency is improved.

[0060] 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 .

[0061] Specifically, a cooling solenoid valve is installed in a suitable position on the third branch 8, between the indoor condenser 3 and the outdoor condenser 9. Normally, the cooling solenoid valve is in a normally closed state. When the third branch 8 needs to be activated for a specific cooling operation, a signal is sent to the cooling solenoid valve via the control system, causing it to open and allow the refrigerant to pass through. When the third branch 8 is not required, the cooling solenoid valve remains closed, preventing the refrigerant from flowing through this branch.

[0062] 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 .

[0063] Specifically, a heating solenoid valve is installed in a suitable location on the second branch 7, between the indoor condenser 3 and the cooler 10. The heating solenoid valve is normally open. When the second branch 7 is operating, 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 the refrigerant flow in the second branch 7 needs to be adjusted or closed under specific circumstances, the heating solenoid valve can be controlled by the control system to close or adjust its opening.

[0064] 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.

[0065] Specifically, the fourth branch is primarily used for specialized cooling or heat recovery functions in vehicle air conditioning systems. After exiting compressor 1, the refrigerant enters outdoor condenser 9 for heat exchange. It then passes through a first one-way valve and enters evaporator 4, where it evaporates and absorbs heat. This process can provide additional cooling or allow for the recovery of some heat. Finally, the refrigerant passes through gas-liquid separator 5 and returns to compressor 1, completing this specialized cycle.

[0066] In a preferred embodiment, a first one-way valve is provided between the outdoor condenser 9 and the evaporator 4 .

[0067] Specifically, a first one-way valve is installed in a suitable location between the outdoor condenser 9 and the evaporator 4, ensuring that it is installed in the correct orientation. The first one-way valve allows the refrigerant to flow from the outdoor condenser 9 to the evaporator 4 in one direction, preventing the refrigerant from flowing in the opposite direction. This ensures that the refrigerant in the fourth branch flows in a specific direction, ensuring the normal operation of the system.

[0068] In a preferred embodiment, the outdoor condenser 9 also has a radiator.

[0069] Specifically, the radiator is mounted on the outdoor condenser 9 using a suitable fixing method to ensure close contact between the radiator and the outdoor condenser 9 to achieve good heat transfer. When the outdoor condenser 9 is operating, the radiator also functions. The radiator can help the outdoor condenser 9 to dissipate heat better and improve 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 remains within an appropriate range, thereby improving the performance and reliability of the entire vehicle air conditioning system.

[0070] Example 2

[0071] 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 Example 1. The method comprises the following steps:

[0072] S1. After receiving the power-on signal of the vehicle, determine in real time whether the two-position three-way reversing valve 2 is suspected of being blocked;

[0073] 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 number of pulses;

[0074] The real-time determination of whether the two-position three-way directional valve 2 is suspected of being blocked specifically includes the following steps:

[0075] 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 length 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 length and the number of pulse signals reaches the target number of pulses after the first preset time length, it is determined that the two-position three-way reversing valve 2 is normal.

[0076] Specifically, the target number of pulses corresponding to the transition from the first state to the second state is equal to the target number of pulses corresponding to the transition from 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 begins real-time monitoring of the state of the two-position, three-way directional valve 2. 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, approximately 90 pulses are required to transition from the first state to the second state. Assuming that rotation normally completes within the first preset time (5 seconds), the pulse number range from the first state to the second state is 90. If, after 5 seconds, the number of pulse signals is less than 90 and remains unchanged, it can be determined to be a suspected stall, resulting in an inability to receive pulse signals to complete rotation.

[0077] S2. If the two-position three-way directional valve 2 is suspected of being blocked, a target initialization instruction is sent to the two-position three-way directional valve 2, and it is determined whether the two-position three-way directional valve 2 can complete initialization according to the target initialization instruction;

[0078] 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 .

[0079] 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, the two-position three-way reversing valve 2 is determined to be 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.

[0080] 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. The operating instruction is used to control the valve core 24 to rotate to the corresponding target operating angle. 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.

[0081] Specifically, if initialization is complete, it indicates that the valve has likely returned to normal operation with the assistance of this target initialization instruction. At this point, the previous operating instruction is re-output. If the valve core 24 rotates normally to the target operating angle corresponding to the previous operating instruction, it is determined that the two-position three-way reversing valve 2 has indeed returned to normal operation. This indicates that after processing, the valve has returned to normal operation and can continue to operate according to the preset program. Conversely, if the valve core 24 fails to complete initialization according to the target initialization instruction, it indicates that the suspected stall cannot be restored by initialization or other operations. It is a true 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.

[0082] Specifically, the previous operation 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 5s. The previous operation 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 rotated normally to the target operating angle corresponding to the previous operation instruction.

[0083] Furthermore, after re-outputting the previous running instruction, the method further includes the following steps:

[0084] 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.

[0085] 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.

[0086] The control method proposed in this embodiment is based on the dual-hole structure of the two-position three-way reversing valve 2 of Example 1, which can also improve the control stability. Specifically, when the control method detects a suspected stall stage, this dual-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 stall, due to the existence of the dual-hole structure, the refrigerant still has the opportunity to flow to the corresponding branch through one of the holes. This avoids sudden changes in system pressure or temperature control caused by the complete inability of the refrigerant to flow during the fault detection and preliminary processing stages, providing 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 dual-hole structure can better cooperate with the control method, so that when the valve core 24 is rotated back to the target operating angle, 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 just because the valve core 24 has just resumed normal rotation, reducing the impact on the system and allowing the refrigerant to circulate smoothly in different branches according to control instructions, ensuring the stable operation of the vehicle air-conditioning system.

[0087] 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 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, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, 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 control method for a two-position three-way reversing valve of a vehicle air conditioning system, characterized in that: Applied to a vehicle air conditioning system, the method comprises the following steps: 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 directional valve (2) is suspected of being blocked, a target initialization instruction is sent to the two-position three-way directional valve (2), and it is determined whether the two-position three-way directional 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 stalled, and an alarm message indicating that the two-position three-way reversing valve (2) is stalled is outputted; The previous operation instruction is the operation instruction outputted 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.

2. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 1, 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.

3. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to any one of claims 1-2, characterized in that: The vehicle air conditioning system comprises: 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 provided 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 sequentially connected in series 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 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 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) that 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 with 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 with 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 pipe and remains open, and the axis angle θ between the second flow channel (221) and the third flow channel (231) is 80°≤θ≤100°. 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).

4. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 3, 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) is connected to the output end of the driving element (25) and is coaxially arranged with the shell, the valve core (24) has the second flow channel (221) and the third flow channel (231) that 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; A sealing ring is provided at each of the first opening (11) and the second opening (12), 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.

5. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 4, 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 sequentially connected in series to form a third branch (8).

6. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 5, 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).

7. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 4, 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).

8. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 4, 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.

9. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 8, characterized in that: A first one-way valve is provided between the outdoor condenser (9) and the evaporator (4).

10. The control method of a two-position three-way reversing valve of a vehicle air conditioning system according to claim 4, characterized in that: The outdoor condenser (9) is also provided with a radiator.

Images