Vehicle air conditioning system and control method of three-position three-way valve thereof

Abstract

The invention provides a vehicle air conditioning system and a control method of a three-position three-way valve thereof. The system is characterized in that the output end of a compressor is connected with the input end of an indoor condenser; the three-position three-way valve is arranged in a first pipeline at the output end of the indoor condenser, a valve element of the three-position three-way 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 three-position three-way valve has a first state, a second state and a third state, the refrigerant inlet is connected with the first pipeline and keeps normally open, and the included angle theta between the axes of the second flow channel and the third flow channel is larger than or equal to 50 degrees and smaller than or equal to 70 degrees, so that when reversing is conducted between the first branch and the second branch, refrigerant flowing is in the gradual change process, and the instantaneous pressure building condition in the reversing process is avoided; and in the third state, the valve body of the structure enables the refrigerant in any flow channel of the valve element not to flow back to the indoor condenser.

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 three-position three-way 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, the structural design of the three-position three-way valve often has some problems, which may cause the air conditioning system to have pressure build-up during operation, thus affecting the stability and reliability of the system.

[0003] In the prior art, there is a multi-way three-way 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 three-way 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 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 three-position three-way valve thereof.

[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 the refrigerant; the output end of the compressor is connected to the input end of the indoor condenser; A three-position three-way valve, the three-position three-way valve is arranged in a first pipeline at the output end of the indoor condenser, the valve core of the three-position three-way 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 valve seat of the three-position three-way valve has a first opening matched with the first refrigerant outlet and a second opening matched with the second refrigerant outlet; The first opening is in communication with a first branch, and the first branch is formed by connecting the compressor, the indoor condenser, the cooler and the gas-liquid separator in series in sequence; The second opening is communicated with a second branch, the second branch is formed by a first flow path and a second flow path, the first flow path is formed by the compressor, the indoor condenser, the outdoor condenser, the cooler and the gas-liquid separator being connected in series in sequence, and the second flow path is formed by the compressor, the indoor condenser, the outdoor condenser, the evaporator and the gas-liquid separator being connected in series in sequence; The three-position three-way valve has a first state, a second state and a third state. In the first state, the first refrigerant outlet is connected to 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 connected to the second opening, and the first refrigerant outlet is blocked from the first opening, so that the refrigerant flows through the second branch. In the third state, both the first refrigerant outlet and the second refrigerant outlet are blocked, and the refrigerant flows in the third branch. The third branch is formed by a third flow path and a fourth flow path, and the third flow path is formed by the compressor, the outdoor condenser, the cooler and the gas-liquid separator being connected in series in sequence. The fourth flow path is formed by the compressor, the outdoor condenser (5), the evaporator and the gas-liquid separator being connected in series in sequence. 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 50°≤θ≤70°, and the refrigerant can always flow in the flow channel of the three-position three-way valve during the switching process between the first state and the second state.

[0006] According to the technical solution provided in the embodiment of the present application, the three-position three-way 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 drive the three-position three-way valve to switch between the first state, the second state and the third 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; in the third state, both the first refrigerant outlet and the second refrigerant outlet are blocked by the valve seat.

[0007] According to the technical solution provided in the embodiment of the present application, it also includes a fourth branch, which is formed by connecting the compressor, the indoor condenser, the evaporator and the gas-liquid separator in series in sequence, the output end of the indoor condenser is connected to the input end of the evaporator, the output end of the evaporator 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.

[0008] According to the technical solution provided in the embodiment of the present application, it also includes a fifth branch, which is formed by connecting the compressor, the indoor condenser, the outdoor condenser, the evaporator and the gas-liquid separator in series in sequence, the output end of the indoor condenser 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 evaporator, the output end of the evaporator 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.

[0009] In a second aspect, the present application provides a control method for a three-position three-way valve of a vehicle air-conditioning system, which is used to control the three-position three-way 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 three-position three-way valve is suspected of being blocked; If the three-position three-way valve is suspected of being blocked, a target initialization instruction is sent to the three-position three-way valve, and it is determined whether the three-position three-way 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, the three-position three-way valve is determined to be normal; if not, the suspected stall is determined to be a stall, and an alarm message indicating that the three-position three-way 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 three-position three-way 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, the second state or the third state.

[0010] 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 three-position three-way valve is blocked is output.

[0011] According to the technical solution provided in the embodiment of the present application, the driving element is a stepper motor, and the stepper motor drives the three-position three-way valve to switch between each two states, respectively corresponding to the target number of pulses; The real-time determination of whether the three-position three-way valve is suspected of being blocked specifically comprises 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 a first preset time period and the number of pulse signals does not reach any of the target pulse numbers, it is determined that the three-position three-way valve is suspected of being blocked.

[0012] According to the technical solution provided in the embodiment of the present application, after receiving the power-on signal of the vehicle, the following steps are included: The refrigerant operation data is collected in real time and stored in a refrigerant operation database, wherein the operation data at least includes refrigerant pressure data and refrigerant flow data, and the refrigerant operation database includes multiple collection moments and the operation data at each collection moment.

[0013] According to the technical solution provided in the embodiment of the present application, sending the target initialization instruction to the three-position three-way valve specifically includes the following steps: Retrieving the refrigerant operation database to obtain a reference data set, wherein the reference data set includes a plurality of first moments and the operation data corresponding to each of the first moments; the first moment is a collection moment within a second preset time period before the three-position three-way valve is suspected of being blocked; According to the reference data set, corresponding target initialization parameters are obtained, wherein the target initialization parameters at least include a driving current and a driving pulse frequency for driving the valve core to rotate; A target initialization instruction corresponding to the target initialization parameter is sent to the three-position three-way valve.

[0014] According to the technical solution provided in the embodiment of the present application, before re-outputting the previous operation instruction, the following steps are also included: Obtain the total number of pulse signals corresponding to the previous running instruction and the total time required to execute the previous running instruction; Dividing the total number of pulse signals into a plurality of sub-pulse numbers, and determining the sub-duration corresponding to each sub-pulse number according to the total duration; According to all the sub-pulse numbers and the sub-duration corresponding to each sub-pulse number, a step sequence is obtained; the step sequence includes a plurality of step durations and a step pulse number corresponding to each of the step durations; After re-outputting the previous operation instruction, the following steps are also included: Start timing, and obtain the first actual number of pulses within the step duration according to the step duration in the step sequence; If the first actual pulse number within a certain step duration is different from the step pulse number corresponding to the step duration, it is determined that the valve core has not normally rotated to the target operating angle corresponding to the previous operating instruction.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: the vehicle air-conditioning system of the present invention adopts a three-position three-way valve of a specific structure, which is installed on the first pipe of the air-conditioning system, and the valve core of the three-position three-way 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 valve seat of the three-position three-way valve has a first opening matched with the first refrigerant outlet and a second opening matched with the second refrigerant outlet, the axial angle θ between the second flow channel and the third flow channel is 50°≤θ≤70°, and the refrigerant outlets of the two flow channels and the openings on the valve seat cooperate to realize the three-position valve. When the three-way valve switches back and forth between the first state and the second state (flow path diversion process), the flow path is always connected to the opening during the rotation of the valve core; 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 three-way three-way 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. 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 50°≤θ≤70°, the refrigerant can flow to the second branch through the second refrigerant outlet that gradually increases the degree of connection. This structure ensures that when the first state and the second state are switched between each other, the refrigerant always has a flow path to flow when flowing through the three-way three-way reversing valve, avoiding the situation where the valve core rotates and completely blocks a refrigerant outlet at a certain moment, resulting in pressure buildup, thereby improving the stability and reliability of the system. In addition, when the three-position three-way valve is switched to the third state, the first refrigerant outlet and the second refrigerant outlet are blocked, which can ensure that in the forced cooling mode, the refrigerant in the valve body will not flow back to the indoor condenser, thereby improving the cooling effect and effectively preventing damage to the air-conditioning system components. 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 three-position three-way valve provided in an embodiment of the present application; Figure 3A schematic diagram of the structure of a three-position three-way valve provided in an embodiment of the present application when switching between a first state and a second state; Figure 4 A schematic structural diagram of a three-position, three-way valve in a third state provided in an embodiment of the present application.

[0017] The text annotations in the figure represent: 1. Compressor; 2. Three-position three-way valve; 21. Refrigerant inlet; 22. First refrigerant outlet; 23. Second refrigerant outlet; 3. Evaporator; 4. Gas-liquid separator; 5. Outdoor condenser; 6. Cooler; 7. Indoor condenser; 8. First branch; 9. Second branch; 11. First opening; 12. Second opening; 24. Valve core; 25. Driving element; 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, the present application proposes a vehicle air conditioning system, comprising: A compressor 1, wherein the output end of the compressor 1 is used to output the refrigerant; the output end of the compressor 1 is connected to the input end of the indoor condenser 7; A three-position three-way valve 2, the three-position three-way valve 2 is arranged in the first pipeline at the output end of the indoor condenser 7, the valve core 24 of the three-position three-way valve 2 has a first flow channel 211, a second flow channel 221 and a third flow channel 231 which 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 valve seat of the three-position three-way valve 2 has a first opening 11 matched with the first refrigerant outlet 22 and a second opening 12 matched with the second refrigerant outlet 23; The first opening 11 is in communication with a first branch 8, and the first branch 8 is formed by the compressor 1, the indoor condenser 7, the cooler 6 and the gas-liquid separator 4 connected in series in sequence; The second opening 12 is communicated with the second branch 9, and the second branch 9 is formed by a first flow path and a second flow path, wherein the first flow path is formed by the compressor 1, the indoor condenser 7, the outdoor condenser 5, the cooler 6 and the gas-liquid separator 4 being connected in series in sequence, and the second flow path is formed by the compressor 1, the indoor condenser 7, the outdoor condenser 5, the evaporator 3 and the gas-liquid separator 4 being connected in series in sequence; The three-position three-way valve 2 has a first state, a second state and a third state. In the first state, the first refrigerant outlet 22 is 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 8. In the second state, the second refrigerant outlet 23 is 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 9. In the third state, both the first refrigerant outlet 22 and the second refrigerant outlet 23 are blocked, and the refrigerant flows in the third branch. The third branch is formed by the third flow path and the fourth flow path, which are connected in series in sequence by the compressor 1, the outdoor condenser 5, the cooler 6 and the gas-liquid separator 4, and the fourth flow path is formed by the compressor 1, the outdoor condenser 5, the evaporator 3 and the gas-liquid separator 4, which are connected in series in sequence. Among them, the refrigerant inlet 21 is connected to the first pipeline and remains normally open, the axial angle θ between the second flow channel 221 and the third flow channel 231 is 50°≤θ≤70°, and the refrigerant can always flow in the flow channel of the three-position three-way valve 2 during the switching process between the first state and the second state.

[0021] Specifically, please refer to Figure 3 As shown, a is the position of the second flow channel 221 and the third flow channel 231 when the three-position three-way valve 2 is in the first state, c is the position of the second flow channel 221 and the third flow channel 231 when it is in the second state, and b is the process of switching between the first state and the second state. The special structure of the three-position three-way valve 2 makes it possible for the flow channel in the valve core 24 to always be connected to the opening on the valve seat during the process of switching the flow direction of the refrigerant when switching between the first state and the second state (by Figure 3It can be seen that the first refrigerant outlet in a is aligned and connected with the first opening, a part of the first refrigerant outlet in b is connected with the first opening, a part of the second refrigerant outlet is connected with the second opening, and the second refrigerant outlet in c is aligned and connected with the second opening). This means that the flow direction of the refrigerant can be accurately controlled, whether it flows to the first branch 8 or the second branch 9, it can be flexibly adjusted according to the actual refrigeration needs. For example, under different external ambient temperatures and in-vehicle temperature settings, by accurately controlling the flow direction of the refrigerant, the air-conditioning system can be more efficiently cooled and energy waste can be reduced. This structure can realize the switching of multiple refrigeration modes. In different states, the refrigerant flows through different branches, so that the air-conditioning system can adapt to different working conditions. For example, when the temperature in the car is high and the outside temperature is low, it can be selected to let the refrigerant mainly flow through the first branch 8, and use the indoor condenser 7 and cooler 6 and other components to more efficiently reduce the temperature in the car; and when the temperature in the car is high and the outside temperature is also high, by switching to the second branch 9, the outdoor condenser 5 is also involved in the refrigeration process to enhance the refrigeration effect.

[0022] Specifically, Figure 4 As shown, the three-position three-way valve 2 is in the third state, and the valve seat of the three-position three-way valve 2 blocks the first refrigerant outlet 22 and the second refrigerant outlet 23, so that the refrigerant flows to the third branch. Among them, in the fourth flow path, the refrigerant passes through the outdoor condenser 5 after coming out of the compressor 1, and then enters the evaporator 3, where the refrigerant evaporates and absorbs heat, thereby realizing refrigeration in the car. Since the refrigerant no longer passes through the indoor condenser 7, the heat exchange loss in the indoor condenser 7 is reduced, so that more refrigerant can directly enter the evaporator 3 for refrigeration, which enhances the refrigeration effect to a certain extent. In this process, if the refrigerant flows back to the indoor condenser 7, it will destroy the originally designed refrigerant flow direction and heat exchange balance. The double-channel valve core structure with an axis angle θ of 50°≤θ≤70° in the present application cooperates with the valve seat to avoid this situation, so that the refrigerant can efficiently perform heat exchange and circulation according to the predetermined path, ensuring that the key components such as the evaporator 3 can continuously obtain low-temperature refrigerant, thereby stably outputting cold air and maintaining the refrigeration efficiency in the car. Preventing refrigerant backflow can also help extend the service life of the indoor condenser 7, reduce maintenance costs and replacement frequency, avoid pressure fluctuations, temperature abnormalities and other problems in the system, reduce various faults caused by refrigerant backflow, improve the reliability and stability of the system, and enable the air-conditioning system to continuously and stably provide a comfortable environment in the vehicle.

[0023] It should be noted that the angle formed by the central axes of the first refrigerant outlet 22 and the second refrigerant outlet 23 is 60°±10°, and the central axis of the refrigerant inlet 21 is perpendicular to the plane where the central axes of the two refrigerant outlets are located; the first opening 11 and the second opening 12 on the valve seat, the angle formed by the central axes of the two is also 60°±10°; when the three-position three-way valve 2 switches between the first state and the second state, the position of the central axis of the refrigerant inlet 21 remains unchanged, 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 refrigerant outlet is connected to the corresponding valve seat opening at any time.

[0024] In a preferred embodiment, the three-position three-way 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 drive the three-position three-way valve 2 to switch between the first state, the second state and the third 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; 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; in the third state, both the first refrigerant outlet 22 and the second refrigerant outlet 23 are blocked by the valve seat.

[0025] Specifically, the first state corresponds to conducting the first branch 8 so that the refrigerant flows in the first branch 8, the second state corresponds to conducting the second branch 9 so that the refrigerant flows in the second branch 9, and the third state corresponds to the cut-off state so that the refrigerant flows in the third branch. The driving element 25 can be a small motor (such as a stepping motor). The motor drives the valve core 24 to switch between different states by precisely controlling the rotation angle. The second flow channel 221 and the third flow channel 231 of the valve core 24 structure are both connected to the first flow channel 211, so that the refrigerant can flow from the refrigerant inlet 21 into the valve core 24, and flow out from the corresponding refrigerant outlet according to different states. The three-position three-way valve 2 is embedded in the first pipeline, and the refrigerant outlet and the valve seat opening are matched under different states through the rotation of the valve core 24.

[0026] In a preferred embodiment, it also includes a fourth branch, which is formed by connecting the compressor 1, the indoor condenser 7, the evaporator 3 and the gas-liquid separator 4 in series in sequence, the output end of the indoor condenser 7 is connected to the input end of the evaporator 3, the output end of the evaporator 3 is connected to the input end of the gas-liquid separator 4, and the output end of the gas-liquid separator 4 is connected to the input end of the compressor 1.

[0027] Specifically, in the fourth branch, the refrigerant is output from the compressor 1, cooled by the indoor condenser 7, and then enters the evaporator 3 for heat exchange to further reduce the temperature. Then, the refrigerant flows into the gas-liquid separator 4 to separate the liquid refrigerant and the gaseous refrigerant therein, and the gaseous refrigerant is re-absorbed by the compressor 1 for the next cycle. The usage scenario of this branch is: in some special cases, such as when it is necessary to quickly reduce the humidity in the car or to perform dehumidification mode. After the refrigerant passes through the compressor 1 and the indoor condenser 7, heat exchange is performed in the evaporator 3. Due to the action of the evaporator 3, the moisture in the air can be condensed into water droplets, thereby reducing the humidity in the car. The gas-liquid separator 4 ensures that the gaseous refrigerant can smoothly return to the compressor 1 and continue to circulate.

[0028] In a preferred embodiment, it also includes a fifth branch, which is formed by connecting the compressor 1, the indoor condenser 7, the outdoor condenser 5, the evaporator 3 and the gas-liquid separator 4 in series in sequence, the output end of the indoor condenser 7 is connected to the input end of the outdoor condenser 5, the output end of the outdoor condenser 5 is connected to the input end of the evaporator 3, the output end of the evaporator 3 is connected to the input end of the gas-liquid separator 4, and the output end of the gas-liquid separator 4 is connected to the input end of the compressor 1.

[0029] Specifically, in the fifth branch, after the refrigerant is output from the compressor 1, it first passes through the indoor condenser 7 for preliminary cooling, and then enters the outdoor condenser 5 for further heat dissipation. Next, the refrigerant flows into the evaporator 3 for heat exchange, and after the temperature is lowered, it enters the gas-liquid separator 4 to separate the liquid refrigerant and the gaseous refrigerant. The gaseous refrigerant is re-absorbed by the compressor 1 and continues to circulate. The usage scenario of this branch is: when the temperature inside the car is extremely high and the external environment is also very hot, rapid cooling and humidity reduction are required at the same time. At this time, the fourth branch comes into play. After the refrigerant passes through the compressor 1, the indoor condenser 7, and the outdoor condenser 5, heat exchange is performed in the evaporator 3, which not only enhances the heat dissipation effect, but also reduces the humidity inside the car. The gas-liquid separator 4 ensures the stability of the cycle.

[0030] Example 2 This embodiment provides a control method for a three-position three-way valve 2 of a vehicle air conditioning system, which is used to control the three-position three-way valve 2 in the vehicle air conditioning system as provided in Embodiment 1; the method comprises the following steps: After receiving the power-on signal of the vehicle, it is determined in real time whether the three-position three-way valve 2 is suspected of being blocked; Furthermore, the driving element 25 is a stepping motor, and the stepping motor drives the three-position three-way valve 2 to switch between each two states corresponding to the target pulse number; The real-time determination of whether the three-position three-way 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 a first preset time period and the number of pulse signals does not reach any of the target pulse numbers, it is determined that the three-position three-way valve 2 is suspected of being blocked.

[0031] Specifically, the target pulse number corresponding to the first state to the second state is equal to the target pulse number corresponding to the second state to the first state, and the target pulse number corresponding to the first state to the third state, the target pulse number corresponding to the second state to the third state, and the target pulse number corresponding to the first state to the second state are different. For example, the required rotation angle from the first state to the second state is 60 degrees, the required rotation angle from the first state to the third state is 180 degrees, and the required rotation angle from the second state to the third state is 120 degrees. After the vehicle is powered on, the system starts to monitor the state of the three-position three-way valve 2 in real time. Under this valve body structure, it takes 60°±10° to turn from the first state to the second state or from the second state to the first state. For a stepper motor with a step angle of 1°, if the rotation angle is 60°, the required pulse number = 60°÷1° = 60 pulses; if the rotation angle is 70°, the required pulse number = 70°÷1° = 70 pulses. Therefore, it takes about 60 to 70 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 60 - 70. If after 5 seconds, the number of pulse signals is less than 60 and has not changed, it can be determined as suspected stalling, resulting in the inability to receive pulse signals normally to complete the rotation.

[0032] If the three-position three-way valve 2 is suspected of being blocked, a target initialization instruction is sent to the three-position three-way valve 2, and it is determined whether the three-position three-way 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 three-position three-way valve 2 .

[0033] In a preferred embodiment, after receiving the power-on signal of the vehicle, the following steps are included: The refrigerant operation data is collected in real time and stored in a refrigerant operation database, wherein the operation data at least includes refrigerant pressure data and refrigerant flow data, and the refrigerant operation database includes multiple collection moments and the operation data at each collection moment.

[0034] Specifically, the operation data is obtained through the pressure sensor and flow sensor installed on the refrigerant pipeline. For example, the refrigerant pressure and flow data are collected once every certain time (such as 1 second), and the collection time and the corresponding operation data are stored in the database. The refrigerant operation database is a time series database, which is convenient for subsequent query and analysis of the operation status of the refrigerant system.

[0035] Furthermore, the sending of the target initialization instruction to the three-position three-way valve 2 specifically includes the following steps: Retrieving the refrigerant operation database to obtain a reference data set, the reference data set including a plurality of first moments and the operation data corresponding to each of the first moments; the first moment is a collection moment within a second preset time period before the three-position three-way valve 2 is suspected of being blocked; According to the reference data set, corresponding target initialization parameters are obtained, wherein the target initialization parameters at least include a driving current and a driving pulse frequency for driving the valve core 24 to rotate; A target initialization instruction corresponding to the target initialization parameter is sent to the three-position three-way valve 2.

[0036] Exemplarily, the second preset time is set to 1 minute, then all the collected moments and corresponding refrigerant pressure, flow and other data within 1 minute before the suspected stall occurs are extracted from the database. Specifically, if the refrigerant pressure is high in the reference data set, it may be necessary to increase the drive current to overcome greater resistance; if the refrigerant flow changes rapidly, it may be necessary to adjust the drive pulse frequency to adapt to the dynamic changes of the system. Sending a target initialization instruction corresponding to the target initialization parameter to the refrigerant dual-control valve can make it possible to try to solve the suspected stall problem more specifically based on the operating conditions before the suspected stall occurs, thereby increasing the probability of restoring the valve to normal.

[0037] Specifically, a relationship model between refrigerant pressure, flow rate, driving current, and driving pulse frequency is constructed. A multivariate linear regression model is used, with refrigerant pressure and flow rate as input variables, and driving current and driving pulse frequency as output variables. By training a historical data sample set (obtained from the previous refrigerant operation database and refrigerant system), a model is obtained that can predict the appropriate driving current and driving pulse frequency based on the refrigerant pressure and flow rate over a period of time. The refrigerant pressure and flow rate data in the reference data set are input into the model to obtain the corresponding target initialization parameters.

[0038] If yes, the previous operation instruction is re-outputted. If the valve core 24 rotates normally to the target operation angle corresponding to the previous operation instruction, the three-position three-way valve 2 is determined to be normal. If no, the suspected stall is determined to be stalled, and an alarm message indicating that the three-position three-way valve 2 is stalled is outputted. Among them, the previous operating instruction is the operating instruction output most recently before the suspected jam occurred in the three-position three-way 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, the second state, or the third state.

[0039] Specifically, if the initialization can be completed, it means that the valve may have resumed normal working state 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 three-position three-way 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.

[0040] In a preferred embodiment, 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 three-position three-way valve 2 is blocked is output.

[0041] Specifically, the previous operation instruction is the total number of pulse signals and the total duration required for the control valve core 24 to rotate from the initialization position to the corresponding target operation angle, for example, 90 total pulse signals within 3 minutes. The previous operation instruction can be re-output directly, and the second actual pulse number of the stepper motor is read after the preset duration. If the second actual pulse number is less than the total pulse signal number of 90, it is determined that the valve core 24 has not rotated normally to the target operation angle corresponding to the previous operation instruction. In addition, the idea of ​​step-by-step output can be used as another implementation method: In a preferred embodiment, before re-outputting the previous operation instruction, the following steps are also included: Obtain the total number of pulse signals corresponding to the previous running instruction and the total time required to execute the previous running instruction; Dividing the total number of pulse signals into a plurality of sub-pulse numbers, and determining the sub-duration corresponding to each sub-pulse number according to the total duration; According to all the sub-pulse numbers and the sub-duration corresponding to each sub-pulse number, a step sequence is obtained; the step sequence includes a plurality of step durations and a step pulse number corresponding to each of the step durations; After re-outputting the previous operation instruction, the following steps are also included: Start timing, and obtain the first actual number of pulses within the step duration according to the step duration in the step sequence; If the first actual pulse number within a certain step duration is different from the step pulse number corresponding to the step duration, it is determined that the valve core 24 has not normally rotated to the target operating angle corresponding to the previous operating instruction.

[0042] Specifically, the total number of pulse signals is divided into multiple identical or different sub-pulse numbers, and the sub-time length corresponding to each sub-pulse number is determined according to the total time length (if the number of sub-pulses is the same, the corresponding sub-time lengths are the same; if the number of sub-pulses is different, the corresponding sub-time lengths are different, and the number of sub-pulses is proportional to the sub-time length).

[0043] Exemplarily, the total number of 90 pulse signals is divided into 5 sub-pulses of 18, and the sub-time length corresponding to each sub-revolution is determined to be 36s according to 3min, and the step sequence is [18, 36; 18, 36; 18, 36; 18, 36; 18, 36]. After the previous operation instruction is re-output, the timing starts, and the first actual pulse number in the first 36s is recorded as 18 in the period, and the first actual pulse number in the second 36s is recorded in the period. If it is also 18, continue to the next... If after a certain 36s period, it is found that the first actual pulse number in the period is not 18 turns (usually less than 18), it is determined that the valve core 24 has not normally rotated to the target operation angle corresponding to the previous operation instruction.

[0044] Specifically, compared with the above-mentioned method of reading the second actual pulse number after the total duration, this implementation can discover the problem more timely and earlier (for example, if this method finds that the first actual pulse number of this time period is 14 in the fourth 36s, then the stall can be determined at 144s, which is earlier than the above-mentioned 3 minutes).

[0045] 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 an input end of an indoor condenser (7); A three-position three-way valve (2), the three-position three-way valve (2) being arranged in a first pipeline at an output end of the indoor condenser (7), the valve core (24) of the three-position three-way valve (2) having a first flow channel (211), a second flow channel (221) and a third flow channel (231) which are interconnected, the first flow channel (211) being connected to a refrigerant inlet (21), the second flow channel (221) being connected to a first refrigerant outlet (22), and the third flow channel (231) being connected to a second refrigerant outlet (23); the valve seat of the three-position three-way valve (2) having a first opening (11) arranged to match the first refrigerant outlet (22) and a second opening (12) arranged to match the second refrigerant outlet (23); The first opening (11) is in communication with a first branch (8), wherein the first branch (8) is formed by the compressor (1), the indoor condenser (7), the cooler (6) and the gas-liquid separator (4) being connected in series in sequence; The second opening (12) is in communication with a second branch (9), the second branch (9) being formed by a first flow path and a second flow path, the first flow path being formed by the compressor (1), the indoor condenser (7), the outdoor condenser (5), the cooler (6) and the gas-liquid separator (4) being connected in series in sequence, and the second flow path being formed by the compressor (1), the indoor condenser (7), the outdoor condenser (5), the evaporator (3) and the gas-liquid separator (4) being connected in series in sequence; The three-position three-way valve (2) has a first state, a second state and a third state. In the first state, the first refrigerant outlet (22) is 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 (8). In the second state, the second refrigerant outlet (23) is 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 (9). In the third state, both the first refrigerant outlet (22) and the second refrigerant outlet (23) are blocked, and the refrigerant flows in the third branch. The third branch is formed by a third flow path and a fourth flow path. The third flow path is formed by the compressor (1), the outdoor condenser (5), the cooler (6) and the gas-liquid separator (4) being connected in series in sequence. The fourth flow path is formed by the compressor (1), the outdoor condenser (5), the evaporator (3) and the gas-liquid separator (4) being connected in series in sequence. 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 50°≤θ≤70°, and during the switching process between the first state and the second state, the refrigerant can always flow in the flow channel of the three-position three-way valve (2).

2. The vehicle air conditioning system according to claim 1, characterized in that: The three-position three-way 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 drive the three-position three-way valve (2) to switch between the first state, the second state and the third 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; in the third state, both the first refrigerant outlet (22) and the second refrigerant outlet (23) are blocked by the valve seat.

3. The vehicle air conditioning system according to claim 1, characterized in that: The fourth branch is formed by sequentially connecting the compressor (1), the indoor condenser (7), the evaporator (3) and the gas-liquid separator (4) in series, wherein the output end of the indoor condenser (7) is connected to the input end of the evaporator (3), the output end of the evaporator (3) is connected to the input end of the gas-liquid separator (4), and the output end of the gas-liquid separator (4) is connected to the input end of the compressor (1).

4. The vehicle air conditioning system according to claim 1, characterized in that: The fifth branch is formed by sequentially connecting the compressor (1), the indoor condenser (7), the outdoor condenser (5), the evaporator (3) and the gas-liquid separator (4) in series, wherein the output end of the indoor condenser (7) is connected to the input end of the outdoor condenser (5), the output end of the outdoor condenser (5) is connected to the input end of the evaporator (3), the output end of the evaporator (3) is connected to the input end of the gas-liquid separator (4), and the output end of the gas-liquid separator (4) is connected to the input end of the compressor (1).

5. A control method for a three-position three-way valve of a vehicle air-conditioning system, used for controlling the three-position three-way valve (2) in the vehicle air-conditioning system according to any one of claims 2 to 4; characterized in that: The following steps are involved: After receiving a power-on signal from the vehicle, determining in real time whether the three-position three-way valve (2) is suspected of being blocked; If the three-position three-way valve (2) is suspected of being blocked, a target initialization instruction is sent to the three-position three-way valve (2), and it is determined whether the three-position three-way 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 three-position three-way valve (2) is normal; If not, the suspected stall is determined to be a stall, and an alarm message indicating that the three-position three-way valve (2) is stalled is output; The previous operation instruction is the operation instruction output most recently before the suspected jam of the three-position three-way 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, the second state, or the third state.

6. The control method of the three-position three-way valve of the vehicle air conditioning system according to claim 5, 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 three-position three-way valve (2) is blocked is output.

7. The control method of the three-position three-way valve of the vehicle air conditioning system according to claim 5, characterized in that: The driving element (25) is a stepping motor, and the stepping motor drives the three-position three-way valve (2) to switch between two states corresponding to a target number of pulses; The real-time determination of whether the three-position three-way valve (2) is suspected of being blocked specifically comprises the following steps: The number of pulse signals of the stepper motor is acquired in real time, and if the number of pulse signals does not change within a first preset time period and the number of pulse signals does not reach any of the target pulse numbers, it is determined that the three-position three-way valve (2) is suspected of being blocked.

8. The control method of a three-position three-way valve according to claim 7, characterized in that: After receiving the power-on signal of the vehicle, the following steps are included: The refrigerant operation data is collected in real time and stored in a refrigerant operation database, wherein the operation data at least includes refrigerant pressure data and refrigerant flow data, and the refrigerant operation database includes multiple collection moments and the operation data at each collection moment.

9. The control method of a three-position three-way valve according to claim 6, characterized in that: The sending of the target initialization instruction to the three-position three-way valve (2) specifically comprises the following steps: Retrieving the refrigerant operation database to obtain a reference data set, the reference data set comprising a plurality of first moments and the operation data corresponding to each of the first moments; the first moment is a collection moment within a second preset time period before the three-position three-way valve (2) is suspected of being blocked; Obtaining corresponding target initialization parameters according to the reference data set, wherein the target initialization parameters at least include a driving current and a driving pulse frequency for driving the valve core (24) to rotate; A target initialization instruction corresponding to the target initialization parameter is sent to the three-position three-way valve (2).

10. The control method of a three-position three-way valve according to claim 5, characterized in that: Before re-outputting the previous operation instruction, the following steps are also included: Obtain the total number of pulse signals corresponding to the previous running instruction and the total time required to execute the previous running instruction; Dividing the total number of pulse signals into a plurality of sub-pulse numbers, and determining the sub-duration corresponding to each sub-pulse number according to the total duration; According to all the sub-pulse numbers and the sub-duration corresponding to each sub-pulse number, a step sequence is obtained; the step sequence includes a plurality of step durations and a step pulse number corresponding to each of the step durations; After re-outputting the previous operation instruction, the following steps are also included: Start timing, and obtain the first actual number of pulses within the step duration according to the step duration in the step sequence; If the first actual pulse number within a certain step time length is different from the step pulse number corresponding to the step time length, it is determined that the valve core (24) has not normally rotated to the target operating angle corresponding to the previous operating instruction.

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