Refrigerant double-control valve and control method thereof

Abstract

The invention provides a refrigerant double-control valve and a control method thereof.The refrigerant double-control valve is characterized in that a driving assembly is arranged in a valve body, and the driving assembly comprises a valve motor, a magnet rotor coaxially arranged with the valve body and a lead screw fixedly connected with the magnet rotor; the valve needle assembly is in threaded connection with the lead screw, the valve motor drives the magnet rotor to rotate and drives the valve needle assembly to move up and down, the end, away from the lead screw, of the valve needle assembly is matched with the valve port, the opening degree of the valve port is controlled through movement of the valve needle assembly, and the refrigerant reversing and / or proportional distribution function is achieved. The monitoring assembly is arranged outside the first space and used for converting the monitored magnetic field change of the magnet rotor into an electric signal and feeding the electric signal back to the upper computer when the valve needle assembly moves, the rotation angle of the magnet rotor is obtained through the electric signal, and the rotation angle corresponds to the opening degree of the valve port one to one. According to the refrigerant valve, the rotor, the lead screw and the valve needle assembly are directly connected, the monitoring assembly monitors the rotation condition of the rotor and equivalently monitors the action condition of the valve needle, and the control accuracy of the valve opening can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerant valves, and in particular to a refrigerant dual-control valve and a control method thereof. Background Art

[0002] The refrigerant reversing needle valve / refrigerant proportioning needle valve is a control element used to control the refrigerant reversing and refrigerant proportioning in the refrigeration system. Its key performance indicators are: first, whether the valve needle assembly can accurately reach the specified position during the execution process, so that the internal leakage requirements are met in the cut-off branch; second, the refrigerant reversing needle valve / refrigerant proportioning needle valve is required to effectively output the accurate position of the valve core; In the structure of the existing needle valve type electronic expansion valve, since the screw rod and the valve needle assembly are not directly matched, in the feedback mechanism that uses the host computer to output the pulse number instruction and the valve directly feeds back the rotor rotation pulse number, the rotor rotation pulse number cannot effectively correspond to the actual mechanical motion state of the valve needle. This makes it so that when the valve needle is stuck, the rotor still rotates and the rotor rotation pulse number is fed back as usual, but the actual valve needle position and the rotor pulse number have formed an incorrect corresponding relationship, resulting in erroneous control information. In addition, if the rotor or screw rod assembly is slightly stuck but not stuck, the actual rotor rotation angle pulse number will be less than the pulse number output by the host computer to the electronic expansion valve, which will also cause the valve needle opening to be less than the actual required value. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a refrigerant dual-control valve and a control method thereof, aiming to improve the accuracy of the refrigerant dual-control valve during the execution of refrigerant switching and / or proportional distribution.

[0004] In a first aspect, the present application proposes a refrigerant dual-control valve, comprising: A valve body, wherein the valve body has a first space, a driving assembly is arranged in the first space, the driving assembly comprises a valve motor, a magnet rotor coaxially arranged with the valve body, and a screw rod fixedly connected with the magnet rotor, the extension direction of the screw rod is a first direction; a coil is arranged at a corresponding position of the magnet rotor outside the first space; a valve seat inlet, a first valve seat outlet and a second valve seat outlet are provided on the valve body, the second valve seat outlet is arranged at an end of the valve body away from the driving assembly, the valve seat inlet and the first valve seat outlet are both annularly distributed on the valve body, and the valve seat inlet is located between the first valve seat outlet and the second valve seat outlet; A valve needle assembly, wherein the valve needle assembly is threadedly connected to the screw rod, and the valve motor can drive the magnet rotor to rotate and drive the valve needle assembly to move along the first direction. The end of the valve needle assembly away from the screw rod has a drum-shaped plug, and the valve port is a channel port for the circulation of refrigerant in the refrigerant dual-control valve. The valve motor drives the valve needle assembly to move along the first direction so that the upper and lower conical surfaces of the drum-shaped plug of the valve needle assembly respectively cooperate with the valve port and the first valve seat outlet, and change the opening of the valve port and the first valve seat outlet when moving up and down, so as to realize the reversing and / or proportional distribution function of the refrigerant at the second valve seat outlet and the first valve seat outlet; A monitoring component is arranged outside the first space, and is used for monitoring the change of the magnetic field of the magnet rotor when the valve needle assembly moves, and converting the monitored change of the magnetic field of the magnet rotor into a corresponding electrical signal and feeding it back to a host computer, and the host computer is used for obtaining the rotation angle of the magnet rotor through the electrical signal, and the rotation angle corresponds to the valve opening one by one.

[0005] According to the technical solution provided in the embodiment of the present application, the material of the drum-shaped plug and the valve port is a hard material, and a soft sealing structure is embedded in the edge of the valve port or the outer periphery of the drum-shaped plug.

[0006] According to the technical solution provided in the embodiment of the present application, the monitoring component is a Hall sensor, and the electrical signal is a jump count of the Hall sensor.

[0007] According to the technical solution provided in the embodiment of the present application, in the first space, along the first direction, the drum-shaped plug has a first stop position and a second stop position, and the refrigerant dual-control valve has an initialization standard value; when the upper computer outputs an instruction to the valve motor to operate the valve needle assembly from the first stop position to the second stop position, during the operation of the valve needle assembly, when the jump count of the Hall sensor reaches the initialization standard value, it indicates that the initialization of the refrigerant dual-control valve is completed.

[0008] According to the technical solution provided in the embodiment of the present application, the initialization standard value is related to the refrigerant information, environmental information and soft sealing structure information, the refrigerant information at least includes the refrigerant type, the environmental information at least includes the ambient temperature, and the soft sealing structure information at least includes the material and size of the soft sealing structure.

[0009] According to the technical solution provided in the embodiment of the present application, the soft sealing structure is an O-ring type sealing structure.

[0010] In a second aspect, the present application proposes a control method for a refrigerant dual-control valve, which is implemented based on the above-mentioned refrigerant dual-control valve and includes the following steps: After sending an initialization instruction to the valve motor, judging whether the refrigerant dual-control valve has completed initialization according to the jump count of the Hall sensor; If so, when the vehicle-side demand information for refrigerant reversing and / or proportional distribution is received, an execution instruction is sent to the valve motor, and the jump count of the Hall sensor during the operation of the valve needle assembly is received in real time; the execution instruction is an instruction to control the valve motor to drive the valve needle assembly to a target position, and the target position has a corresponding first target jump value; When the jump count of the Hall sensor reaches the first target jump value, a stop instruction is sent to the valve motor to make the valve needle assembly reach the target position.

[0011] According to the technical solution provided in the embodiment of the present application, the initialization instruction includes a first instruction and a second instruction, the first instruction is an instruction for controlling the valve motor to drive the valve needle assembly to run from the current position to the first stop position, and the second instruction is an instruction for controlling the valve motor to drive the valve needle assembly to run from the first stop position to the second stop position; after sending the initialization instruction to the valve motor, judging whether the refrigerant dual-control valve has completed initialization according to the jump count of the Hall sensor, specifically includes the following steps: Sending the first instruction, and acquiring a first jump count of the Hall sensor in real time during the process of the valve needle assembly running from the current position to the first stop position; If the first jump count does not change within a first preset time period or the reverse electromotive force of the valve motor continues to be abnormal, it is determined that the valve needle assembly has reached the first stop position, and the second instruction is sent; When the valve needle assembly moves from the first stop position to the second stop position, a second jump count of the Hall sensor is acquired in real time; If the second jump count reaches the initialization standard value, it is determined that the refrigerant dual-control valve has completed initialization; if the second jump count does not reach the initialization standard value, it is determined that the valve is blocked.

[0012] According to the technical solution provided in the embodiment of the present application, the following steps are also included: During the operation of the valve needle assembly or during the period when no initialization command is sent to the valve motor, if the Hall sensor jump count does not change within a second preset time period, or the Hall sensor jump count changes steadily and the reverse electromotive force is abnormal, it is determined that the valve is stuck.

[0013] According to the technical solution provided in the embodiment of the present application, the method further includes obtaining the initialization standard value; The obtaining of the initialization standard value specifically comprises the following steps: Retrieving a thermal management configuration table to obtain the refrigerant information and the soft seal structure information; the thermal management configuration table includes configuration information of each component in the thermal management system; Acquire the current ambient temperature, and obtain a candidate standard value according to the current ambient temperature, the refrigerant information and the soft sealing structure information; Obtaining a finite element valve body model corresponding to the refrigerant dual-control valve, and judging, based on the finite element valve body model, whether the refrigerant dual-control valve meets the internal leakage requirement after initialization is completed under the candidate standard value; If so, the candidate standard value is used as the initialization standard value.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows: in the refrigerant double-control valve of the present application, the screw rod is fixedly connected to the magnet rotor, the screw rod and the magnet rotor rotate together, and the valve needle assembly cooperates with the screw rod thread to form a structure in which the magnet rotor, the screw rod and the valve needle assembly are directly connected. Such a structure enables the rotation of the screw rod to drive the valve needle assembly to move only up and down, but not rotate. The screw rod and the valve needle assembly cooperate directly, and if either of them is stuck, the other will also be unable to move synchronously. Therefore, at this time, the monitoring component detects the movement state of the magnet rotor, which is equivalent to detecting the movement of the valve needle, and monitors the magnet rotor through the monitoring component The magnetic field changes (N / S pole switching times) are converted into the rotation angle of the magnet rotor and transmitted to the host computer, which can be converted to the accurate valve opening, so that both stalling and minor jamming can be accurately monitored, and the position of the valve needle assembly can be accurately fed back. In addition, since this feedback mechanism does not require a fixed pulse, there is no numerical volatility in the number of fixed pulses, so it can also meet the proportional distribution function of the key valve indicators. Regardless of whether a single valve is operated multiple times or multiple valves work together, it can ensure the high-precision requirements for the distribution of refrigerant flow between the two branches, which is of great significance to improving the performance of the entire refrigerant system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a refrigerant dual-control valve provided in an embodiment of the present application; Figure 2 A flow chart of the steps of a control method for a refrigerant dual-control valve provided in an embodiment of the present application.

[0016] The text labels shown in the figure represent: 1. Valve body; 2. Magnet rotor; 3. Screw rod; 4. Valve needle assembly; 41. Drum plug; 5. Monitoring assembly; 6. Valve port; 7. Soft sealing structure; 8. Valve seat inlet; 9. Second valve seat outlet; 10. First valve seat outlet; 11. Coil. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] Example 1 As mentioned in the background technology, in view of the problems in the prior art, this embodiment proposes a refrigerant dual-control valve, including: A valve body 1, wherein the valve body 1 has a first space therein, wherein a driving assembly is arranged in the first space, wherein the driving assembly comprises a valve motor, a magnet rotor 2 coaxially arranged with the valve body 1, and a screw 3 fixedly connected with the magnet rotor 2, wherein the extension direction of the screw 3 is a first direction; a coil 11 is arranged at a corresponding position of the magnet rotor 2 outside the first space; a valve seat inlet 8, a first valve seat outlet 10, and a second valve seat outlet 9 are provided on the valve body 1, wherein the second valve seat outlet 9 is arranged at an end of the valve body 1 away from the driving assembly, wherein the valve seat inlet 8 and the first valve seat outlet 10 are both annularly distributed on the valve body 1, and the valve seat inlet 8 is located between the second valve seat outlet 9 and the first valve seat outlet 10; A valve needle assembly 4, wherein the valve needle assembly 4 is threadedly connected to the screw rod 3, and the valve motor can drive the magnet rotor 2 to rotate and drive the valve needle assembly 4 to move along the first direction. The end of the valve needle assembly 4 away from the screw rod 3 has a drum-shaped plug 41, and the valve port 6 is a channel port for the circulation of refrigerant in the refrigerant dual-control valve. The valve motor drives the valve needle assembly 4 to move along the first direction so that the upper and lower conical surfaces of the drum-shaped plug 41 of the valve needle assembly 4 cooperate with the valve port 6 and the first valve seat outlet 10 respectively, and change the opening of the valve port 6 and the first valve seat outlet 10 when moving up and down, so as to realize the reversing and / or proportional distribution function of the refrigerant at the second valve seat outlet 9 and the first valve seat outlet 10; Specifically, the first direction is the extension direction of the valve body 1. When the valve needle assembly 4 moves up and down along the first direction, the upper and lower conical surfaces of the drum-shaped plug 41 cooperate with the upper and lower parts of the valve port to seal. The first valve seat outlet 10 is connected to one of the branches of the thermal management system, and the second valve seat outlet 9 is connected to the other branch. The valve seat inlet 8 is used to flow refrigerant into the valve body.

[0020] A monitoring component 5 is arranged outside the first space, and is used to monitor the change of the magnetic field of the magnet rotor 2 when the valve needle assembly 4 moves, and convert the monitored change of the magnetic field of the magnet rotor 2 into a corresponding electrical signal and feed it back to the host computer, and the host computer is used to obtain the rotation angle of the magnet rotor 2 through the electrical signal, and the rotation angle corresponds to the opening of the valve port 6 one by one.

[0021] Furthermore, the monitoring component 5 is a Hall sensor, and the electrical signal is a jump count of the Hall sensor.

[0022] Specifically, the valve body 1 is made of high-strength, corrosion-resistant materials, such as aluminum alloy or stainless steel. The first space inside it is precisely machined to ensure the matching accuracy with the magnet rotor 2, the screw rod 3 and other components. The valve body 1 plays the role of protecting the internal components and providing an installation foundation. The shape and size of the valve body 1 are designed according to the actual application requirements, which must not only meet the installation space requirements of the internal components, but also consider the connection and integration with the entire refrigerant system. The inner wall of the valve body 1 is provided with a guide groove matching the cross-sectional shape of the valve needle assembly 4 along the first direction. The guide groove is used to limit the valve needle assembly 4 and guide it during the movement of the valve needle assembly 4. The valve motor selects a motor suitable for the working environment of the refrigerant system, such as a brushless DC motor. The motor has the characteristics of high efficiency, low noise, high reliability, etc., and can provide sufficient power to drive the magnet rotor 2 to rotate. The motor is controlled by the host computer through a specific control signal, such as a PWM (pulse width modulation) signal or a LIN (local interconnect network) communication protocol. The magnet rotor 2 is coaxially arranged with the valve body 1 to ensure the stability and accuracy of the rotation. The magnet rotor 2 is connected to the screw rod 3 by welding or other reliable fixed connection methods, so that the power of the motor can be effectively transmitted to the screw rod 3. The magnet rotor 2 is made of magnetic conductive material so that it can cooperate with the monitoring component 5 (such as a Hall sensor) to detect its magnetic field changes, wherein the monitoring component 5 needs to be installed outside the first space at a position where the magnetic field changes of the magnet rotor 2 can be sensed. The material of the screw rod 3 is selected from high-strength, wear-resistant metal materials, such as alloy steel. The threads on the screw rod 3 are precisely machined and have high precision in matching with the threads of the valve needle assembly 4, ensuring that the valve needle assembly 4 can move smoothly in the first direction when the screw rod 3 rotates. The extension direction (first direction) of the screw rod 3 is determined according to the installation position and working requirements of the refrigerant dual-control valve in the system, and is usually consistent with the flow direction of the refrigerant or the opening and closing direction of the valve port 6.

[0023] Specifically, when the magnet rotor 2 rotates, its magnetic field changes, and the Hall sensor detects this change and converts it into a corresponding electrical signal. The electrical signal is usually a Hall sensor jump count. The host computer receives the electrical signal from the Hall sensor, and the host computer calculates the speed and rotation angle of the magnet rotor 2 according to the frequency and time interval of the Hall sensor jump count.

[0024] The following describes the working principle of reversing and proportional distribution: Assume that initially, the position of the drum plug 41 in the valve port 6 makes the refrigerant mainly flow to the second valve seat outlet 9. At this time, the drum plug 41 and the valve port 6 along the first direction side (the side close to the second valve seat outlet 9) have a high degree of cooperation, providing a relatively smooth passage for the refrigerant to flow to the second valve seat outlet 9, while restricting the passage to the first valve seat outlet 10 to a certain extent.

[0025] Reversing process: When the valve motor starts and drives the magnet rotor 2 to rotate, the screw rod 3 rotates accordingly, and the valve needle assembly 4 moves in the first direction. As the valve needle assembly 4 moves, the position of the drum plug 41 in the valve port 6 changes. The degree of fit between the drum plug 41 and the side of the valve port 6 close to the second valve seat outlet 9 gradually decreases, the channel gradually narrows, and the degree of fit between the drum plug 41 and the side of the valve port 6 close to the first valve seat outlet 10 gradually increases. When the valve needle assembly 4 moves to a certain position, the drum plug 41 is basically out of fit with the side of the valve port 6 close to the second valve seat outlet 9, and is tightly fitted with the side of the valve port 6 close to the first valve seat outlet 10. At this time, the main flow direction of the refrigerant is converted from the second valve seat outlet 9 to the first valve seat outlet 10, thereby realizing the refrigerant reversal. This is because the drum plug 41 adjusts the flow path of the refrigerant in the valve port 6 by changing its position in the valve port 6, guiding the refrigerant to flow to different outlets.

[0026] Proportional adjustment process: During the movement of the valve needle assembly 4 in the first direction, the flow ratio of the refrigerant to the second valve seat outlet 9 and the first valve seat outlet 10 is adjusted by precisely controlling the position of the drum-shaped plug 41 in the valve port 6. When the valve needle assembly 4 starts to move, for example, in the direction of causing more refrigerant to flow to the first valve seat outlet 10, the degree of fit between the drum-shaped plug 41 and the side of the valve port 6 close to the second valve seat outlet 9 begins to decrease, causing the refrigerant flow to the second valve seat outlet 9 to gradually decrease; at the same time, the degree of fit between the drum-shaped plug 41 and the side of the valve port 6 close to the first valve seat outlet 10 begins to increase, causing the refrigerant flow to the first valve seat outlet 10 to gradually increase.

[0027] During the operation of the refrigerant valve, the monitoring component 5 (such as a Hall sensor) monitors the change in the magnetic field of the magnet rotor 2 and converts it into an electrical signal and feeds it back to the host computer. The host computer obtains the rotation angle of the magnet rotor 2 through the electrical signal. The rotation angle corresponds to the movement stroke of the valve needle component 4 along the first direction, and the movement stroke corresponds to the opening of the flow channel (the opening of the valve port 6). Therefore, the precise control of the opening of the valve port 6 can be achieved.

[0028] In a preferred embodiment, the drum-shaped plug 41 and the valve port 6 are made of hard materials, and a soft sealing structure 7 is embedded in the edge of the valve port 6 or the outer periphery of the drum-shaped plug 41 .

[0029] Furthermore, the soft sealing structure 7 is an O-ring type sealing structure.

[0030] Specifically, at the edge of the valve port 6 or outside the drum-shaped plug 41 ( Figure 1 The soft sealing structure 7 is embedded outside the plug (in the figure), and is exemplarily an O-ring type sealing structure. The soft sealing structure 7 is made of elastic material, such as rubber, silicone, etc., and has good sealing performance and elastic deformation ability. When the valve needle assembly 4 cooperates with the valve port 6, the soft sealing structure 7 is compressed, fills the gap between the valve needle and the valve port 6, and forms an effective seal. The setting of the soft sealing structure 7 can prevent refrigerant leakage and improve the working efficiency and reliability of the refrigerant dual control valve. In the actual application of the valve, this compressed soft sealing structure 7 (O-ring) will fill the tiny gap originally existing between the valve needle and the valve port 6, and rely on its own elasticity to fit tightly on the contact surface of the two, thereby forming a barrier to prevent refrigerant leakage and achieve a sealing effect. When installing the O-ring, ensure that its position is accurate and firm, and it will not be displaced or damaged during the movement of the valve needle assembly 4. For example, a slot or groove for installing the O-ring can be set on the edge of the valve port 6, the O-ring can be installed in the slot or groove, and a special tool can be used to press and fix it. In practical applications, the material and size of the O-ring can be adjusted and optimized as needed to improve its sealing performance and service life.

[0031] Specifically, when the valve needle continues to move toward the valve port 6, after the soft sealing structure 7 (O-ring) has completed the filling of the gap and achieved sealing, the hard part on the valve needle will contact the hard part corresponding to the valve port 6. The hard part here is usually made of a material with high hardness such as metal, for example, the head of the valve needle (the end in contact with the valve port 6) and the inner wall edge of the valve port 6 are hard. This contact is like two hard objects hitting each other, which will limit the further movement of the valve needle toward the valve port 6 and play a role of stopping. From the perspective of precise control, the opening and closing degree of the valve port 6 can be accurately controlled through the contact stop of the hard part. Because as long as the valve needle assembly 4 is set to move to the valve port 6 to the position where the hard part just contacts, the desired valve port 6 opening can be accurately achieved every time, meeting the requirements for flow control during refrigerant reversal or proportional distribution. At the same time, from the perspective of protection, it plays a protective role for the soft sealing structure 7. If there is no stop mechanism for the hard part, the valve needle may over-compress the soft sealing structure 7 (O-ring), causing the O-ring to be over-compressed and deformed, thus affecting its sealing performance and service life. The hard part contact stop can ensure that the soft sealing structure 7 works within a reasonable compression range, maintains a good sealing state and prolongs its service life.

[0032] In a preferred embodiment, in the first space, along the first direction, the drum-shaped plug 41 has a first stop position and a second stop position, and the refrigerant dual-control valve has an initialization standard value; when the upper computer outputs an instruction to the valve motor to operate the valve needle assembly 4 from the first stop position to the second stop position, during the operation of the valve needle assembly 4, when the jump count of the Hall sensor reaches the initialization standard value, it indicates that the initialization of the refrigerant dual-control valve is completed.

[0033] Specifically, the initialization standard value is a specific count value that characterizes the completion of the initialization of the refrigerant dual-control valve through the jump count of the Hall sensor when the host computer controls the valve needle assembly to move from the first stop position to the second stop position in the refrigerant dual-control valve. This value is used to ensure that the valve can be accurately opened to the appropriate opening under various conditions to achieve the normal distribution and reversing functions of the refrigerant. The first stop position and the second stop position are the limit positions of the movement of the valve needle assembly 4, corresponding to the fully closed and fully open states of the valve port 6, respectively. In actual applications, the positions of the first stop position and the second stop position can be determined by mechanical limit, sensor detection, etc. For example, a mechanical limit structure can be set in the valve body 1 to limit the range of motion of the valve needle assembly 4; or a position sensor can be installed on the valve needle assembly 4 to detect the position of the valve needle assembly 4 in real time.

[0034] In a preferred embodiment, the initialization standard value is related to refrigerant information, environmental information and soft sealing structure information, the refrigerant information at least includes the refrigerant type, the environmental information at least includes the ambient temperature, and the soft sealing structure information at least includes the material and size of the soft sealing structure 7.

[0035] Specifically, different types of refrigerants have different physical properties and flow characteristics. For example, different refrigerants may have very different parameters such as viscosity, density, and thermal conductivity at the same temperature and pressure. These parameters will affect the flow resistance of the refrigerant in the valve and the movement resistance of the valve needle assembly 4, thereby affecting the opening of the valve port 6 and the initialization standard value. Therefore, when determining the initialization standard value, this embodiment takes into account the influence of the refrigerant type; at the same time, changes in ambient temperature will also affect the viscosity, density and other parameters of the refrigerant, thereby affecting the movement resistance of the valve needle assembly 4 and the opening of the valve port 6. For example, in a low temperature environment, the viscosity of the refrigerant will increase, and the movement resistance will also increase accordingly, and the valve needle assembly 4 will require a greater driving force to move to the same position. Therefore, when determining the initialization standard value, this embodiment also takes into account the influence of ambient temperature. In addition, the material and size of the soft sealing structure 7 will also affect its elastic deformation ability and sealing performance, thereby affecting the movement accuracy of the valve needle assembly 4 and the opening of the valve port 6. For example, the elastic deformation of the soft sealing structure 7 made of different materials may be different under the same pressure; the compression of the soft sealing structure 7 of different sizes may also be different during installation. These factors will affect the movement resistance of the valve needle assembly 4 and the opening of the valve port 6, thereby affecting the initialization standard value. Therefore, when determining the initialization standard value, this embodiment also considers the influence of the soft sealing structure information.

[0036] This embodiment determines the initialization standard value by comprehensively considering the refrigerant information, environmental information and soft sealing structure information, and can more accurately control the opening of the valve port 6. This is essential for achieving accurate refrigerant switching and proportional distribution, so that the refrigerant dual-control valve can maintain stable performance under different working conditions. For example, when the ambient temperature changes or different refrigerants are used, the valve can automatically adapt to these changes by adjusting the initialization standard value to avoid performance fluctuations or instability caused by parameter changes. At the same time, considering the influence of the soft sealing structure information on the initialization standard value, it is possible to avoid excessive extrusion or improper operation of the soft sealing structure 7 by the valve needle assembly 4, thereby protecting the soft sealing structure 7 and extending its service life. For example, if the initialization standard value is set improperly, the valve needle assembly 4 may over-compress the soft sealing structure 7, causing it to deform and damage. By reasonably considering the material and size of the soft sealing structure 7 and other information to determine the initialization standard value, it is possible to ensure that the soft sealing structure 7 functions within the normal working range and reduce the maintenance and replacement costs caused by damage to the sealing structure. Accurately determining the initialization standard value can make the resistance to the valve needle assembly 4 during movement more reasonable and reduce mechanical wear. For example, when considering the effects of refrigerant type and ambient temperature on movement resistance, the output power and control strategy of the valve motor can be adjusted to make the movement of the valve needle assembly 4 smoother and reduce friction and wear with other components. This can not only extend the service life of the valve, but also reduce the maintenance cost of the system and improve the overall reliability of the equipment.

[0037] Example 2 On the basis of Example 1, this embodiment proposes a control method for a refrigerant dual-control valve, which is implemented based on the refrigerant dual-control valve described in Example 1 and includes the following steps: S1. After sending an initialization instruction to the valve motor, judging whether the refrigerant dual-control valve has completed initialization according to the jump count of the Hall sensor; Further, the initialization instruction includes a first instruction and a second instruction, the first instruction is an instruction for controlling the valve motor to drive the valve needle assembly 4 to run from the current position to the first stop position, and the second instruction is an instruction for controlling the valve motor to drive the valve needle assembly 4 to run from the first stop position to the second stop position; after sending the initialization instruction to the valve motor, judging whether the refrigerant dual-control valve has completed initialization according to the jump count of the Hall sensor, specifically includes the following steps: Sending the first instruction, and acquiring the first jump count of the Hall sensor in real time during the process of the valve needle assembly 4 running from the current position to the first stop position; If the first jump count does not change within the first preset time period or the reverse electromotive force of the valve motor continues to be abnormal, it is determined that the valve needle assembly 4 has reached the first stop position, and the second instruction is sent; When the valve needle assembly 4 moves from the first stop position to the second stop position, a second jump count of the Hall sensor is acquired in real time; If the second jump count reaches the initialization standard value, it is determined that the refrigerant dual-control valve has completed initialization; if the second jump count does not reach the initialization standard value, it is determined that the valve is blocked.

[0038] Specifically, the first preset duration is determined through experiments or experience based on factors such as the motion characteristics of the valve and the response time of the system, and is set to 5 seconds, for example. If the first jump count does not change or the reverse electromotive force of the valve motor continues to be abnormal within the preset duration, it means that the valve needle assembly 4 has stopped moving and has a high probability of reaching the first stop position. At this time, the host computer sends a second instruction to the drive controller of the valve motor through the communication line. After receiving the second instruction, the drive controller controls the valve motor to change the rotation direction or continue to drive the valve needle assembly 4 from the first stop position to the second stop position according to appropriate drive parameters.

[0039] Specifically, during the operation of the valve needle assembly 4 from the first stop position to the second stop position, the host computer also continuously obtains the second jump count of the Hall sensor in real time according to the set time interval, and records and analyzes these data. When the second jump count reaches the previously set initialization standard value (the method of obtaining this value is described in detail in the subsequent related steps), the host computer determines that the refrigerant dual-control valve has completed initialization, which means that the valve has completed the calibration preparation work at startup and can perform subsequent refrigerant reversing and proportional distribution operations. If the second jump count does not reach the initialization standard value during the operation of the valve needle assembly 4 to the second stop position, the host computer determines that the valve is stuck and stuck. At this time, the host computer will issue a corresponding fault prompt message (such as displaying a fault code on the operation interface, sending an alarm text message to the maintenance personnel, etc.) so as to timely troubleshoot and handle the fault.

[0040] S2. If yes, when the vehicle-side demand information of refrigerant reversing and / or proportional distribution is received, an execution instruction is sent to the valve motor, and the jump count of the Hall sensor during the operation of the valve needle assembly 4 is received in real time; the execution instruction is an instruction to control the valve motor to drive the valve needle assembly 4 to reach the target position, and the target position has a corresponding first target jump value; Specifically, once the system determines that the refrigerant dual-control valve has completed initialization, the host computer determines whether it is necessary to perform refrigerant reversing and / or proportional distribution operations according to the operating requirements of the entire refrigerant system (such as an air conditioning refrigeration system). If it is necessary to execute, the host computer generates an execution instruction according to the preset control strategy and target parameters, and sends it to the drive controller of the valve motor through the communication line. The execution instruction contains relevant information about the target position, which is predetermined based on the refrigerant reversing and proportional distribution requirements. For example, to achieve a specific refrigerant flow distribution ratio or switch the refrigerant flow direction, the corresponding valve needle assembly 4 needs to be moved to a specific position, and each such position has a corresponding first target jump value (obtained in advance through a jump model, and the training sample set of the jump model is a plurality of different groups of magnet rotor rotation angles and valve needle assembly displacements, and each group of different magnet rotor 2 rotation angles and valve needle assembly 4 displacements corresponding to the Hall sensor jump count.) After the valve motor receives the execution instruction and starts to drive the valve needle assembly 4 to move, the host computer continues to receive the Hall sensor jump count in real time to track the actual movement of the valve needle assembly 4.

[0041] S3. When the jump count of the Hall sensor reaches the first target jump value, a stop instruction is sent to the valve motor to make the valve needle assembly 4 reach the target position.

[0042] Specifically, the host computer continuously compares the real-time count with the first target jump value during the process of receiving the Hall sensor jump count. When the received Hall sensor jump count reaches the preset first target jump value, it means that the valve needle assembly 4 has theoretically moved to the target position. At this time, the host computer immediately sends a stop command to the valve motor, and the stop command is transmitted to the drive controller of the valve motor through the communication line. After receiving the command, the drive controller cuts off the power supply to the valve motor or takes braking measures to stop the valve motor from rotating, thereby ensuring that the valve needle assembly 4 accurately stays at the target position, and realizing precise control of refrigerant reversing and / or proportional distribution.

[0043] In a preferred embodiment, the following steps are also included: During the operation of the valve needle assembly 4 or during the period when no initialization command is sent to the valve motor, if the Hall sensor jump count does not change within the second preset time period, or the Hall sensor jump count changes steadily and the reverse electromotive force is abnormal, it is determined that the valve is stuck.

[0044] Specifically, during the normal operation of the valve needle assembly 4 (whether in the initialization stage, the refrigerant reversing and proportional distribution operation stage, etc.), or in the period before the initialization instruction is sent to the valve motor (for example, when the system has just been powered on but the initialization process has not yet started), the host computer will continue to monitor the Hall sensor jump count in the background (although the valve body is not running at this time, under normal circumstances, the valve body will be affected by the refrigerant pressure, thermal expansion and contraction of components, mechanical vibration or external interference, etc., causing the Hall sensor jump count to fluctuate). If it is found that the Hall sensor jump count has not changed within the second preset time (the time is also determined according to the system characteristics, such as set to 10 seconds), this may mean that the valve needle assembly 4 is stuck and cannot move normally, and the host computer will determine that the valve is stuck. In addition, even if the Hall sensor jump count has a stable change, but at the same time it detects that the motor's reverse electromotive force is abnormal (for example, the reverse electromotive force value exceeds the normal fluctuation range or there is a sudden change, the reverse electromotive force data can be obtained by installing a voltage detection device at both ends of the motor), this also means that the valve is not operating normally, which is likely to be caused by mechanical parts jamming, circuit failure, etc. At this time, the host computer also determines that the valve is stuck and takes corresponding fault prompts and handling measures, such as recording fault logs, issuing sound and light alarms, etc., to remind maintenance personnel to check and repair the problem in time.

[0045] In a preferred embodiment, the method further comprises obtaining the initialization standard value; The obtaining of the initialization standard value specifically comprises the following steps: Retrieving a thermal management configuration table to obtain the refrigerant information and the soft seal structure information; the thermal management configuration table includes configuration information of each component in the thermal management system; Specifically, the host computer establishes a communication connection with the database of the entire thermal management system (where the thermal management configuration table is stored), and retrieves the data in the thermal management configuration table according to the set index rules (for example, according to the model of the refrigerant dual-control valve, the identification of the system, etc.) through specific query statements (such as SQL statements, if the database adopts a relational database management system) or data reading interface, and obtains refrigerant information (clarifies the specific type of refrigerant used in the current system, such as R410A) and soft sealing structure information (including the material of the soft sealing structure, such as rubber material, and its size specifications, such as the inner diameter, outer diameter, thickness, etc. of the O-ring), extracts this information and stores it in the corresponding variables in the memory for subsequent calculations.

[0046] Acquire the current ambient temperature, and obtain a candidate standard value according to the current ambient temperature, the refrigerant information and the soft sealing structure information; Specifically, the host computer obtains the real-time value of the current ambient temperature through a temperature sensor (installed in a position in the thermal management system that can accurately reflect the ambient temperature, such as near the refrigerant pipeline), and substitutes the obtained current ambient temperature data together with the refrigerant information and soft sealing structure information previously extracted from the thermal management configuration table into a pre-set standard value calculation model, and obtains a candidate standard value after calculation, wherein the current ambient temperature, refrigerant information and soft sealing structure information are input into the standard value calculation model, and the standard value calculation model outputs a candidate standard value.

[0047] Obtaining a finite element valve body model corresponding to the refrigerant dual-control valve, and judging, based on the finite element valve body model, whether the refrigerant dual-control valve meets the internal leakage requirement after initialization is completed under the candidate standard value; Specifically, the host computer obtains the finite element valve body model corresponding to the refrigerant dual control valve from the storage system (such as the model library stored in the hard disk). This model is constructed by professional modeling software (such as ANSYS, etc.) according to the actual geometric structure, material properties, boundary conditions and other parameters of the refrigerant dual control valve, and can simulate the flow of refrigerant in the valve and the mechanical properties of the valve. The candidate standard value is input into the finite element valve body model as the initialization parameter to simulate the operation state of the refrigerant dual control valve after initialization under the candidate standard value, focusing on the internal leakage of the valve, and by analyzing the changes in the flow rate, pressure and other parameters of the refrigerant in the cut-off branch and other key parts in the model, it is judged whether the internal leakage requirements are met (for example, whether the internal leakage flow rate is less than 30ml / min). If the internal leakage requirements are met, it means that the candidate standard value is appropriate and can be used as the initialization standard value for the actual refrigerant dual control valve initialization judgment operation; if the internal leakage requirements are not met, it is necessary to readjust the relevant parameters, recalculate the candidate standard value and perform finite element simulation judgment again until a suitable initialization standard value that meets the internal leakage requirements is found.

[0048] If so, the candidate standard value is used as the initialization standard value.

[0049] The refrigerant dual-control valve in this application is based on the structure, and the switching mode is that the valve core gradually rotates and changes direction, which solves the mechanical suction impact noise when the solenoid valve is turned on and off and the refrigerant impact sound with pressure difference switching; it can also realize the power-off position maintenance, solving the energy consumption problem of the traditional solenoid valve that needs to be powered on to maintain the position. It can also accurately detect the valve operation position, which is better than the solenoid valve without position feedback, and then know whether the system operation mode is normal. The host computer determines the valve operation position by counting the jumps of the Hall sensor of the refrigerant reversing needle valve / refrigerant proportional distribution needle valve, and compares the host computer to determine the valve operation position by the number of pulses output by the refrigerant reversing valve stepper motor. It can avoid the problem that the motor completes the pulse number output by the host computer to the refrigerant reversing needle valve / refrigerant proportional distribution needle valve, but the refrigerant reversing needle valve / refrigerant proportional distribution needle valve is not actually in place due to small jamming and other problems, resulting in internal leakage failure. The initialization control logic can distinguish between the actual completion of the initialization and the jamming of the valve.

[0050] So far, through the above specific implementation methods, the present application can, on the basis of the structure of the refrigerant double-control valve proposed in Example 1, completely realize a series of control operations of the refrigerant double-control valve from initialization control (including determination of initialization standard value) to normal operation control and jam judgment (abnormal monitoring), thereby ensuring that the refrigerant double-control valve can accurately and stably perform the refrigerant switching and proportional distribution functions in the refrigerant system.

[0051] 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 refrigerant double control valve, used to control refrigerant switching and refrigerant proportional distribution, characterized in that: include: A valve body (1), wherein the valve body (1) has a first space therein, wherein a drive assembly is arranged in the first space, wherein the drive assembly comprises a valve motor, a magnet rotor (2) coaxially arranged with the valve body (1), and a screw rod (3) fixedly connected with the magnet rotor (2), wherein the extension direction of the screw rod (3) is a first direction; a coil (11) is arranged at a corresponding position of the magnet rotor (2) outside the first space; a valve seat inlet (8), a first valve seat outlet (10) and a second valve seat outlet (9) are provided on the valve body (1), wherein the second valve seat outlet (9) is arranged at an end of the valve body (1) away from the drive assembly, wherein the valve seat inlet (8) and the first valve seat outlet (10) are both arranged in an annular shape on the valve body (1), and the valve seat inlet (8) is located between the second valve seat outlet (9) and the first valve seat outlet (10); A valve needle assembly (4), wherein the valve needle assembly (4) is threadedly connected to the screw rod (3), and the valve motor can drive the magnet rotor (2) to rotate and drive the valve needle assembly (4) to move along the first direction. The end of the valve needle assembly (4) away from the screw rod (3) has a drum-shaped plug (41), and the valve port (6) is a channel port for the circulation of refrigerant in the refrigerant dual-control valve. The valve motor drives the valve needle assembly (4) to move along the first direction so that the upper and lower conical surfaces of the drum-shaped plug (41) of the valve needle assembly (4) respectively cooperate with the valve port (6) and the first valve seat outlet (10), and change the opening of the valve port (6) and the first valve seat outlet (10) when moving up and down, so as to realize the reversing and / or proportional distribution function of the refrigerant at the second valve seat outlet (9) and the first valve seat outlet (10); A monitoring component (5), the monitoring component (5) being arranged outside the first space, the monitoring component (5) being used to monitor the change of the magnetic field of the magnet rotor (2) when the valve needle component (4) moves, and converting the monitored change of the magnetic field of the magnet rotor (2) into a corresponding electrical signal and feeding it back to a host computer, the host computer being used to obtain the rotation angle of the magnet rotor (2) through the electrical signal, the rotation angle corresponding to the opening of the valve port (6) one by one.

2. The refrigerant dual control valve according to claim 1, characterized in that: The drum-shaped plug (41) and the valve port (6) are made of hard material, and a soft sealing structure (7) is embedded in the edge of the valve port (6) or the outer periphery of the drum-shaped plug (41).

3. The refrigerant dual control valve according to claim 2, characterized in that: The monitoring component (5) is a Hall sensor, and the electrical signal is a jump count of the Hall sensor.

4. The refrigerant dual control valve according to claim 3, characterized in that: In the first space, along the first direction, the drum-shaped plug (41) has a first stop position and a second stop position, and the refrigerant dual-control valve has an initialization standard value; when the upper computer outputs an instruction to the valve motor to operate the valve needle assembly (4) from the first stop position to the second stop position, during the operation of the valve needle assembly (4), when the jump count of the Hall sensor reaches the initialization standard value, it indicates that the initialization of the refrigerant dual-control valve is completed.

5. The refrigerant dual control valve according to claim 4, characterized in that: The initialization standard value is related to refrigerant information, environmental information and soft sealing structure information, wherein the refrigerant information at least includes the refrigerant type, the environmental information at least includes the ambient temperature, and the soft sealing structure information at least includes the material and size of the soft sealing structure (7).

6. The refrigerant dual control valve according to claim 5, characterized in that: The soft sealing structure (7) is an O-ring type sealing structure.

7. A control method for a refrigerant dual-control valve, implemented based on the refrigerant dual-control valve according to any one of claims 4 to 6, characterized in that: The following steps are involved: After sending an initialization instruction to the valve motor, judging whether the refrigerant dual-control valve has completed initialization according to the jump count of the Hall sensor; If so, when the vehicle-side demand information for refrigerant reversing and / or proportional distribution is received, an execution instruction is sent to the valve motor, and the jump count of the Hall sensor during the operation of the valve needle assembly (4) is received in real time; the execution instruction is an instruction for controlling the valve motor to drive the valve needle assembly (4) to reach a target position, and the target position has a corresponding first target jump value; When the jump count of the Hall sensor reaches the first target jump value, a stop command is sent to the valve motor to enable the valve needle assembly (4) to reach the target position.

8. The control method of the refrigerant dual-control valve according to claim 7, characterized in that: The initialization instruction comprises a first instruction and a second instruction, wherein the first instruction is an instruction for controlling the valve motor to drive the valve needle assembly (4) to move from a current position to a first stop position, and the second instruction is an instruction for controlling the valve motor to drive the valve needle assembly (4) to move from the first stop position to a second stop position; after sending the initialization instruction to the valve motor, judging whether the refrigerant dual-control valve has completed initialization according to the jump count of the Hall sensor, specifically comprises the following steps: sending the first instruction, and acquiring in real time a first jump count of a Hall sensor when the valve needle assembly (4) moves from a current position to a first stop position; If the first jump count does not change within a first preset time period or the reverse electromotive force of the valve motor continues to be abnormal, it is determined that the valve needle assembly (4) has reached the first stop position, and the second instruction is sent; In the process of the valve needle assembly (4) running from the first stop position to the second stop position, acquiring a second jump count of the Hall sensor in real time; If the second jump count reaches the initialization standard value, it is determined that the refrigerant dual-control valve has completed initialization; if the second jump count does not reach the initialization standard value, it is determined that the valve is blocked.

9. The control method of the refrigerant dual-control valve according to claim 7, characterized in that: The following steps are also included: During the operation of the valve needle assembly (4) or during a period when no initialization command is sent to the valve motor, if the Hall sensor jump count does not change within a second preset time period, or the Hall sensor jump count changes stably and the reverse electromotive force is abnormal, it is determined that the valve is stuck.

10. The control method of the refrigerant dual-control valve according to claim 8, characterized in that: The method also includes obtaining the initialization standard value; The obtaining of the initialization standard value specifically comprises the following steps: Retrieving a thermal management configuration table to obtain the refrigerant information and the soft seal structure information; the thermal management configuration table includes configuration information of each component in the thermal management system; Acquire the current ambient temperature, and obtain a candidate standard value according to the current ambient temperature, the refrigerant information and the soft sealing structure information; Obtaining a finite element valve body model corresponding to the refrigerant dual-control valve, and judging, based on the finite element valve body model, whether the refrigerant dual-control valve meets the internal leakage requirement after initialization is completed under the candidate standard value; If so, the candidate standard value is used as the initialization standard value.

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