Vehicle control method of refrigerant reversing valve

Abstract

The invention provides a vehicle control method for a refrigerant reversing valve, which comprises the following steps: after an initialization instruction is received, controlling a motor to rotate clockwise by a first target step number so as to drive a valve core to move from a first stop position to a second stop position, and acquiring a first actual driving step number of the motor in real time; if the first actual driving step number reaches the first target step number, the motor is controlled to rotate anticlockwise by the second target step number so as to drive the valve element to move from the second stop position to the first stop position, and the first collection signal number of the Hall sensor is obtained in real time; if the first collection signal number is larger than or equal to the first semaphore, the motor is controlled to rotate clockwise by a third target step number, and a second collection signal number of the Hall sensor is obtained in real time; if the second collection signal number is accumulated to the second semaphore, it is judged that the refrigerant reversing valve completes the initialization action; the method can help the chip controller which does not support the acquisition of the reaction electromotive force to complete the initialization action of the refrigerant reversing valve.

Description

Technical Field

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

[0002] With the continuous development of automobile technology, the refrigerant reversing valve plays a vital role in the vehicle air conditioning system. At present, the initialization of the refrigerant reversing valve in the prior art usually relies on the reaction electromotive force and the Hall sensor to complete the accurate initialization logic. In this way, by monitoring the reaction electromotive force during the operation of the motor and the signal of the Hall sensor, the position of the valve core can be determined more accurately, thereby realizing the initialization of the refrigerant reversing valve.

[0003] However, in actual applications, the chip controller of the vehicle system often needs to control multiple modules not limited to the thermal management system. Sometimes, in order to meet the adaptability of more modules, the selected chip controller does not have the ability to obtain the reaction electromotive force and cannot monitor the current when the motor is running. In this case, the traditional initialization logic based on the reaction electromotive force cannot be applied normally, which brings great challenges to the initialization of the refrigerant reversing valve. If accurate initialization cannot be completed, it will directly affect the normal operation of the refrigerant reversing valve, and then affect the performance and stability of the vehicle air conditioning system. 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 control method for a refrigerant reversing valve to improve the adaptability of the refrigerant reversing valve initialization logic.

[0005] The present application provides a vehicle control method for a refrigerant reversing valve, wherein the refrigerant reversing valve comprises at least a shell, wherein the shell has a first space, wherein a motor and a magnet rotor connected to an output end of the motor are arranged in the first space, wherein the valve motor can drive the magnet rotor to rotate and drive a valve core arranged in the first space to move along the first direction, wherein a coil is arranged outside the first space at a position corresponding to the magnet rotor, and wherein a Hall sensor is arranged outside the first space; wherein the shell has a refrigerant inlet, a first refrigerant outlet, and a second refrigerant outlet, and wherein along the first direction, the valve core has a first stop position corresponding to the first refrigerant outlet, and a second stop position corresponding to the second refrigerant outlet; The method comprises the following steps: After receiving the first initialization instruction, the motor is controlled to rotate clockwise for a first target number of steps to drive the valve core to move from the first stop position to the second stop position, and the first actual driving number of steps of the motor is obtained in real time; wherein the first target number of steps is the number of steps required for the motor to drive the full stroke from the first stop position to the second stop position; If the first actual driving step number reaches the first target step number, the motor is controlled to rotate counterclockwise by a second target step number to drive the valve core to move from the second stop position to the first stop position, and the first collected signal number of the Hall sensor is obtained in real time; wherein the second target step number is the number of steps required for the motor to drive the full stroke from the second stop position to the first stop position; If the first collected signal number is greater than or equal to the first signal quantity, the motor is controlled to rotate clockwise for a third target number of steps, and the second collected signal number of the Hall sensor is acquired in real time; wherein the third target number of steps is the number of steps required for the travel driving motor from the first stop position to the initialization position; and the first signal quantity is obtained from the first target number of steps or the second target number of steps; If the second collected signal number accumulates to a second signal quantity, it is determined that the refrigerant reversing valve completes the initialization action corresponding to the first initialization instruction; wherein, the second signal quantity is obtained by the third target step number.

[0006] According to the technical solution provided in the embodiment of the present application, the first signal quantity is ,in is the first target step number or the second target step number, a is the compensation value, and the compensation value is obtained at least from the friction force, refrigerant pressure and mechanical component differences that the valve core is subjected to when it moves from the second stop position to the first stop position under actual working conditions.

[0007] According to the technical solution provided in the embodiment of the present application, the second signal quantity is ,in is the third target step number, b is the fine-tuning value, and the fine-tuning value is obtained at least by the valve core movement accuracy, the Hall sensor accuracy and the refrigerant flow characteristics.

[0008] According to the technical solution provided in the embodiment of the present application, the initialization position is the position corresponding to the first refrigerant outlet; after determining that the refrigerant reversing valve has completed initialization, the following steps are also included: After receiving the first commutation instruction, the motor is controlled to rotate clockwise for a first target commutation step number, and the third collected signal number of the Hall sensor during the rotation process is obtained in real time; wherein the first commutation instruction is an instruction to commutate from the first refrigerant outlet to the second refrigerant outlet; the first target commutation step number is the number of steps required for the travel drive motor from the first refrigerant outlet to the second refrigerant outlet; If the third collected signal number accumulates to a third signal quantity, it is determined that the first reversing action of the refrigerant reversing valve is completed; wherein the third signal quantity is obtained by the first target reversing step number.

[0009] According to the technical solution provided in the embodiment of the present application, after the real-time acquisition of the third collected signal number of the Hall sensor during the rotation process, the following steps are also included: If the third collected signal number does not reach the third semaphore, reporting a suspected blockage to the bus; Controlling the refrigerant reversing valve to execute a second initialization instruction, and determining whether an initialization action corresponding to the second initialization instruction is completed; If yes, continue to run the first reversing action; if no, report the stall.

[0010] According to the technical solution provided in the embodiment of the present application, after determining that the first reversing action of the refrigerant reversing valve is completed, the following steps are also included: If a second reversing instruction is received, the motor is controlled to compensate for the number of transmission hysteresis steps, and the fourth collected signal number of the Hall sensor is obtained in real time; the second reversing instruction is an instruction to switch from the second refrigerant outlet to the first refrigerant outlet; If the fourth collected signal number reaches the fourth signal quantity, it is determined that the hysteresis compensation is completed and the motor is controlled to rotate counterclockwise for the second target commutation step number, and the fifth collected signal number of the Hall sensor during the rotation process is obtained in real time; wherein the second target commutation step number is the number of steps required for the travel driving motor from the second refrigerant outlet to the first refrigerant outlet direction; the fourth signal quantity is obtained from the transmission hysteresis step number; If the fifth collected signal number is accumulated to the third signal amount, it is determined that the second reversing action of the refrigerant reversing valve is completed.

[0011] According to the technical solution provided in the embodiment of the present application, after obtaining the fourth collected signal number of the Hall sensor, the following steps are also included: If the fourth collected signal number does not reach the fourth signal quantity, it is determined that the hysteresis compensation is not completed, and the refrigerant reversing valve is controlled to perform an initialization action; If the refrigerant reversing valve completes the initialization action, the motor is controlled to rotate counterclockwise for a second target reversing step number, and the sixth collected signal number of the Hall sensor during the rotation process is obtained in real time; If the sixth collected signal number is accumulated to the third signal amount, it is determined that the second reversing action of the refrigerant reversing valve is completed.

[0012] According to the technical solution provided in the embodiment of the present application, after determining that the second reversing action of the refrigerant reversing valve is completed, the following steps are also included: If the first commutation instruction is received again, the motor is controlled to compensate the transmission hysteresis step number, and the seventh collected signal number of the Hall sensor is obtained in real time to determine whether the hysteresis compensation is completed; If the hysteresis compensation is completed, the motor is controlled to rotate clockwise for a first target commutation step number, and the eighth collected signal number of the Hall sensor during the rotation process is obtained in real time; If the eighth collected signal number is accumulated to the third signal amount, it is determined that the first reversing action of the refrigerant reversing valve is completed.

[0013] According to the technical solution provided in the embodiment of the present application, when the degree of forward wear of the valve core in the direction from the first stop position to the second stop position is the same as the degree of reverse wear of the valve core in the direction from the second stop position to the first stop position, the first target step number is the same as the second target step number; if the degree of forward wear is different from the degree of reverse wear, the first target step number is different from the second target step number.

[0014] According to the technical solution provided in the embodiment of the present application, the method further includes obtaining a first target number of steps and a second target number of steps; The obtaining of the first target number of steps and the second target number of steps specifically comprises the following steps: Acquiring the forward wear degree and the reverse wear degree; According to the forward wear degree, a first step compensation value is obtained, and according to the reverse wear degree, a second step compensation value is obtained; Obtain a benchmark target number of steps, obtain the first target number of steps based on the benchmark target number of steps and the first number of steps compensation value, and obtain the second target number of steps based on the benchmark target number of steps and the second number of steps compensation value; wherein the benchmark target number of steps is the number of motor drive steps required from the first refrigerant outlet to the second refrigerant outlet under ideal conditions.

[0015] Compared with the prior art, the beneficial effect of the present application is that the present method does not rely on the reaction electromotive force. By using the motor to rotate a specific number of steps clockwise and counterclockwise, and combining the signal collection and judgment of the Hall sensor, the position of the valve core can be accurately determined to complete the initialization action of the refrigerant reversing valve. Even in the absence of the assistance of the reaction electromotive force, the accuracy of the initialization can be guaranteed, laying the foundation for the normal operation of the refrigerant reversing valve, and it is also applicable to vehicle-mounted systems whose chip controllers do not have the ability to obtain the reaction electromotive force. The control method greatly improves the adaptability of the refrigerant reversing valve in different vehicle-mounted systems, has stronger universality, and a simpler control method, so that more vehicles can use the initialization strategy, expanding its scope of application. At the same time, the accurate initialization achieved by the present method helps the refrigerant reversing valve to stably switch the refrigerant flow direction in subsequent work, thereby improving the stability and reliability of the vehicle air-conditioning system. The probability of failure caused by inaccurate initialization is reduced, and the maintenance cost and the impact on the user experience are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flowchart of the steps of the initialization control method of the refrigerant reversing valve provided in an embodiment of the present application; Figure 2 A flow chart of the steps of the reversing control method of the refrigerant reversing valve provided in an embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the refrigerant reversing valve provided in an embodiment of the present application.

[0017] The text labels shown in the figure represent: 1. Magnet rotor; 2. Valve core; 3. Refrigerant inlet; 4. Second refrigerant outlet; 5. First refrigerant outlet; 6. Shell; 7. Hall sensor. DETAILED DESCRIPTION

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

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

[0020] Example 1 As mentioned in the background technology, in view of the problems in the prior art, this embodiment proposes a vehicle control method for a refrigerant reversing valve, such as Figure 3 As shown, the refrigerant reversing valve at least includes a shell 6, the shell 6 has a first space, the first space is provided with a motor and a magnet rotor 1 connected to the output end of the motor, the valve motor can drive the magnet rotor 1 to rotate and drive the valve core 2 arranged in the first space to move along the first direction, a coil is provided at a position corresponding to the magnet rotor 1 outside the first space, and a Hall sensor 7 is provided outside the first space; the shell 6 has a refrigerant inlet 3, a first refrigerant outlet 5 and a second refrigerant outlet 4, along the first direction, the valve core 2 has a first stop position corresponding to the first refrigerant outlet 5, and a second stop position corresponding to the second refrigerant outlet 4; Specifically, the first stop position refers to the mechanical limit position of the valve core 2 when it is in a position corresponding to the first refrigerant outlet 5 along the first direction, which is used to limit the movement of the valve core 2 and ensure that the refrigerant can flow out through the first refrigerant outlet 5; the second stop position refers to the mechanical limit position of the valve core 2 when it is in a position corresponding to the second refrigerant outlet 4 along the first direction, which is used to limit the movement of the valve core 2 and ensure that the refrigerant can flow out from the second refrigerant outlet 4.

[0021] Please refer to Figure 1 As shown, the method comprises the following steps: S1. After receiving the first initialization instruction, control the motor to rotate clockwise for a first target number of steps to drive the valve core 2 to move from the first stop position to the second stop position, and obtain the first actual driving step number of the motor in real time; wherein the first target number of steps is the number of steps required for the motor to drive the full stroke from the first stop position to the second stop position; Specifically, this embodiment provides a control method that can achieve accurate initialization without relying on back electromotive force, the initialization drive current is 1.5 times the rated current of normal reversing, and when the system receives a first initialization instruction issued by the vehicle control system itself, it is ready to start the initialization operation of the refrigerant reversing valve. This first initialization instruction can be issued by the vehicle control system under specific conditions, such as when the vehicle is started, when the air conditioning system is started, or when the refrigerant reversing valve is detected to be abnormal.

[0022] Specifically, the first target number of steps is step, preferably 1600, first control the motor to rotate clockwise step, in this process, the actual driving steps of the motor are recorded in real time to ensure that the motor can rotate step, if the actual driving step number at a certain moment does not change and has not reached The number of steps of the motor can be precisely controlled by the motor driver, and the actual number of steps of the motor can be monitored in real time by using encoders and other devices.

[0023] S2. If the first actual driving step number reaches the first target step number, the motor is controlled to rotate counterclockwise for a second target step number to drive the valve core 2 to move from the second stop position to the first stop position, and the first collected signal number of the Hall sensor 7 is obtained in real time; wherein the second target step number is the number of steps required for the full-stroke driving motor from the second stop position to the first stop position; and the first collected signal number is the jump count of the Hall sensor 7 during the movement of the valve core 2 from the second stop position to the first stop position; Specifically, this step is to achieve the first actual driving step number step is used to determine whether the valve core 2 has reached the second stop position. When the motor reaches the second stop position, the motor is controlled to rotate counterclockwise for the second target number of steps to make the valve core 2 return to the first stop position again. Under ideal conditions (the valve core 2 has no wear or the degree of wear in the forward and reverse directions is the same), the target step length from the first stop position to the second stop position is the same as the target step length from the second stop position to the first stop position (that is, the second target number of steps is also 1600). In the process of walking from the second stop position to the first stop position, the first collected signal number of the Hall sensor 7 is obtained in real time. The Hall sensor 7 can be installed at an appropriate position of the refrigerant reversing valve to detect the position change of the valve core 2. This step is to determine whether the valve core 2 has returned to the first stop position by monitoring the signal of the Hall sensor 7.

[0024] S3, if the first collected signal number is greater than or equal to the first signal quantity, the motor is controlled to rotate clockwise for a third target number of steps, and the second collected signal number of the Hall sensor 7 is acquired in real time; wherein the third target number of steps is the number of steps required for the travel driving motor from the first stop position to the initialization position; the first signal quantity is obtained by the first target number of steps or the second target number of steps; Furthermore, the first signal quantity is ,in is the first target step number or the second target step number (the first target step number and the second target step number are the same by default), a is the compensation value, and the compensation value is obtained at least from the friction force, refrigerant pressure and mechanical component differences that the valve core 2 is subjected to when it moves from the second stop position to the first stop position under actual working conditions.

[0025] Specifically, since the valve core 2 is affected by actual working conditions such as friction, refrigerant pressure, and differences in mechanical components when it moves from the second stop position to the first stop position, it is not possible to simply rely on the theoretical number of steps to determine whether the valve core 2 returns to the first stop position. Through comprehensive experiments on these actual factors, it is determined that the compensation value a is preferably 50. This step continuously monitors the signal of the Hall sensor 7 to determine whether the valve core 2 reaches the initialization position (the initialization position of this application defaults to the first refrigerant outlet 5) from the first stop position. If it reaches the initialization position, the rotation of the motor is stopped.

[0026] Specifically, the diameter of the passage hole on the cylindrical valve core 2 of the refrigerant reversing valve is smaller than the diameter of the sealing ring on the cylindrical valve core 2 that cooperates with the base for rotational sealing. When the valve is calibrated, the internal leakage requirement of the valve can be met.

[0027] S4. If the second collected signal count accumulates to a second signal quantity, it is determined that the refrigerant reversing valve has completed the initialization action; wherein the second signal quantity is obtained by the third target step number. The second collected signal count is the jump count of the Hall sensor 7 during the movement of the valve core 2 from the first stop position to the initialization position; Specifically, if the second collected signal count reaches the second signal amount, it means that the valve core 2 reaches the initialization position, that is, the initialization action is completed. If the second collected signal count does not reach the second signal amount, it is determined that the valve core 2 is blocked and a blockage is reported.

[0028] Furthermore, the second signal is ,in is the third target step number, b is the fine-tuning value, and the fine-tuning value is obtained at least by the valve core movement accuracy, the Hall sensor accuracy and the refrigerant flow characteristics.

[0029] Specifically, the Y value is preferably 160. Taking into account factors such as valve core movement accuracy, Hall sensor accuracy, and refrigerant flow characteristics, the fine-tuning value b is determined through experiments and actual operating conditions analysis, and the b value is preferably 6.

[0030] Further, when the degree of forward wear of the valve core 2 in the direction from the first stop position to the second stop position is the same as the degree of reverse wear of the valve core 2 in the direction from the second stop position to the first stop position, the first target step number is the same as the second target step number; if the degree of forward wear is different from the degree of reverse wear, the first target step number is different from the second target step number.

[0031] Specifically, a variety of methods can be used to obtain the degree of wear of the valve core 2 in different directions. The degree of wear can be characterized by the change in the size of the contact portion between the valve core 2 and the valve seat. For the degree of forward wear and reverse wear, the decrease in the diameter or length of the contact portion between the valve core 2 and the valve seat when the valve core 2 moves in the forward direction (such as from the first stop position to the second stop position) and in the reverse direction (such as from the second stop position to the first stop position) can be used to represent it. Exemplarily, the refrigerant reversing valve is disassembled at every first preset time interval (the interval time of the maintenance vehicle), and after disassembly, a high-precision measuring tool (such as a micrometer, etc.) is used to measure the size of the contact portion between the valve core 2 and the valve seat. For example, for a cylindrical valve core 2, the diameter of the cylindrical surface in contact with the valve seat is measured; the measured size is compared with the new valve core 2 size standard. The new valve core 2 size standard is pre-measured and recorded when the valve core 2 is in a brand new state. Assuming that the diameter of the contact part between the new valve core 2 and the valve seat is D0, and the diameter measured after a period of time is D1, then the wear degree is D0-D1 (expressed as the diameter reduction). By recording the dimensional changes of the valve core 2 after forward and reverse movement, the data of the forward wear degree and reverse wear degree can be obtained.

[0032] In a preferred embodiment, the method further comprises obtaining a first target number of steps and a second target number of steps; The obtaining of the first target number of steps and the second target number of steps specifically comprises the following steps: Acquiring the forward wear degree and the reverse wear degree; According to the forward wear degree, a first step compensation value is obtained, and according to the reverse wear degree, a second step compensation value is obtained; Obtain a benchmark target number of steps, obtain the first target number of steps based on the benchmark target number of steps and the first number of steps compensation value, and obtain the second target number of steps based on the benchmark target number of steps and the second number of steps compensation value; wherein the benchmark target number of steps is the number of motor drive steps required from the first refrigerant outlet 5 to the second refrigerant outlet 4 under ideal conditions.

[0033] Specifically, this implementation method considers the situation when the first target number of steps is different from the second target number of steps. If the forward wear is more serious, it means that when the valve core 2 moves from the first stop position to the second stop position, the friction between the valve seat increases, the matching clearance changes, etc., which will make the original reference target number of steps no longer applicable. By calling the compensation database (for example, pre-establishing a database of the corresponding relationship between the degree of wear and the number of step compensation values, and obtaining a suitable compensation value by searching and interpolating), the corresponding first step number compensation value is obtained according to the specific forward wear degree. For example, for each increase in the forward wear degree by a certain proportion (such as 10%), the first step number compensation value increases by a certain number of steps (such as 50 steps). Similarly, the second step number compensation value is determined in a similar manner. For example, if the reverse wear makes the valve core 2 and the valve seat fit tighter, it may be necessary to appropriately reduce the number of motor drive steps, and the corresponding second step number compensation value is a negative number (assuming that the wear causes a reduction of 30 steps, the second step number compensation value is -30). The reference target number of steps is the number of motor drive steps required from the first stop position to the second stop position under ideal conditions. This value can be obtained by conducting multiple experimental tests on a new refrigerant reversing valve that has not been worn out. In the experiment, the motor is precisely controlled to drive the valve core 2 to move from the first stop position to the second stop position, and the number of steps required for the motor to run stably each time is recorded. After statistical analysis, the average value is taken as the benchmark target step number (as mentioned above, this value is 1600 steps).

[0034] Therefore, in an ideal state, the first target step number and the second target step number are the reference target step numbers, both of which are 1600 steps. When the first target number of steps is different from the second target number of steps, either the first target number of steps or the second target number of steps can be selected; if the first target number of steps is 80 steps and the second target number of steps is -30 steps in the actual consideration of wear, the first target number of steps is 1600 + 80 = 1680 steps and the second target number of steps is 1600 -30 = 1570 steps. When the first target number of steps and the second target number of steps are different, the corresponding first signal quantity Select a second step goal.

[0035] This embodiment takes into account the wear difference of the valve core 2 in different directions, and by accurately obtaining the wear degree and calculating the corresponding step compensation value, different first target steps and second target steps are obtained, so that the motor-driven valve core 2 can be more accurately controlled to move in two directions. In this way, the problem of inaccurate position of the valve core 2 caused by wear can be avoided, so that the valve core 2 of the refrigerant reversing valve can accurately reach the corresponding stop position every time, and the control accuracy of the entire refrigerant reversing valve during operations such as refrigerant flow direction switching can be improved.

[0036] The working principle of the initialization control strategy of the refrigerant reversing valve is described below: the entire initialization process can be divided into two parts: travel range determination and position accurate judgment. The travel range determination includes controlling the motor to rotate clockwise for the first target number of steps (such as preferably 1600 steps) to determine the full travel distance from the first stop position to the second stop position. After completing the forward stroke, the reverse stroke range is determined. At the same time, the Hall sensor 7 collects signals to determine whether the valve core 2 returns to the first stop position, providing a reference for the subsequent accurate determination of the position of the valve core 2. The accurate position judgment mainly relies on the Hall sensor to collect signals. When the first collected signal number of the Hall sensor 7 is greater than or equal to the first signal quantity, it is determined that the valve core 2 returns to the vicinity of the first stop position. Then, when the motor rotates clockwise for the third target number of steps and the second collected signal number of the Hall sensor 7 accumulates to the second signal quantity, it means that the valve core 2 has reached the initialization position (default is the first refrigerant outlet 5), and the initialization is completed. The entire initialization control scheme is a process of gradually and accurately determining the position of the valve core 2. First, the approximate stroke range is determined by full-stroke movement in the forward and reverse directions, and then the Hall sensor signal is combined with the compensation value and fine-tuning value considering the actual working conditions to accurately determine whether the valve core 2 has returned to the initial position. In this way, the accurate initialization of the refrigerant reversing valve is achieved without relying on reverse electromotive force, providing a reliable basis for the subsequent normal operation of the refrigerant reversing valve, such as accurate refrigerant flow direction switching.

[0037] Example 2 Based on Example 1, this embodiment proposes a refrigerant valve reversing control method, which is intended to be executed when there is a refrigerant reversing demand at the vehicle end after the initialization action is completed. The initialization position in this embodiment is the position corresponding to the first refrigerant outlet 5; the method includes the following steps: After the refrigerant reversing valve is initialized, please refer to Figure 2 As shown, the following steps are also included: After receiving the first reversing instruction, the motor is controlled to rotate clockwise for the first target reversing step number, and the third collected signal number of the Hall sensor 7 during the rotation process is obtained in real time; wherein, the first reversing instruction is an instruction to switch from the first refrigerant outlet 5 to the second refrigerant outlet 4; the first target reversing step number is the number of steps required for the travel driving motor from the first refrigerant outlet 5 to the second refrigerant outlet 4; the third collected signal number is the jump count of the Hall sensor 7 during the process of the valve core 2 moving from the first refrigerant outlet 5 to the second refrigerant outlet 4; It should be noted that Figure 2Port B is the first refrigerant outlet 5, and port C is the second refrigerant outlet 4. Specifically, when the refrigerant reversing valve completes the initialization action, the valve core 2 is at the position corresponding to the first refrigerant outlet 5, and the entire system is in a standby state for receiving a reversing command, waiting for the refrigerant reversing demand command issued by the vehicle end. If the first reversing command is received, it means that it is necessary to switch from the initialization position to the second refrigerant outlet 4, and the first target reversing step number is Wstep, and W is preferably 1250. In this process, the Hall sensor 7 converts the position change of the valve core 2 into an electrical signal and transmits it to the control system so as to monitor the actual position of the valve core 2.

[0038] If the third collected signal number accumulates to a third signal quantity, it is determined that the first reversing action of the refrigerant reversing valve is completed; wherein the third signal quantity is obtained by the first target reversing step number.

[0039] Specifically, the third signal quantity is W / 2±d, where d is a compensation value, preferably 30, and the third collected signal number is continuously compared with the third signal quantity (the third signal quantity is obtained by a certain calculation relationship or empirical value from the first target switching step number, and the specific acquisition method can be to determine the corresponding range of the Hall sensor 7 signal quantity when the switching from the first refrigerant outlet 5 to the second refrigerant outlet 4 can be accurately completed under different working conditions after a large number of experimental tests in the early stage). If the third collected signal number accumulates to the third signal quantity, the control system determines that the first switching action of the refrigerant reversing valve is completed, which means that the refrigerant flow direction switching from the first refrigerant outlet 5 to the second refrigerant outlet 4 is successfully achieved.

[0040] Furthermore, after the real-time acquisition of the third collected signal number of the Hall sensor 7 during the rotation process, the following steps are also included: If the third collected signal number does not reach the third semaphore, reporting suspected congestion to the bus, so that the bus delays to cope with other linkage operations; Controlling the refrigerant reversing valve to execute a second initialization instruction, and determining whether an initialization action corresponding to the second initialization instruction is completed; Specifically, the execution subject of the second initialization instruction is different from that of the first initialization instruction, but the initialization action of the instruction is the same. The first initialization instruction is the control system of the vehicle, and the issuing subject of the second initialization instruction is the host computer. The host computer self-learning program is started to issue the second initialization instruction to the refrigerant reversing valve. In the normal initialization process, the vehicle control system is responsible because this is the routine setting process before the system starts or the refrigerant reversing valve starts working. The vehicle control system can drive the motor and obtain sensor signals according to the pre-set logic and parameters (such as the first target step number, the second target step number, the third target step number, etc.), so that the refrigerant reversing valve reaches a normal initialization state and is ready for subsequent refrigerant reversing operations. When an abnormal situation occurs, the host computer needs to intervene to start the self-learning program for initialization because the host computer can handle the problem from a higher-level system perspective. The host computer can monitor the various components and system status of the entire vehicle. When the refrigerant reversing valve has abnormal conditions such as suspected blocking, the host computer can use the self-learning program to reinitialize the refrigerant reversing valve, which helps to correct possible faults and recalibrate the state of the refrigerant reversing valve.

[0041] If yes, continue to run the first reversing action; if no, report the stall.

[0042] Specifically, if the third collected signal number does not reach the third signal quantity during the clockwise rotation of the motor, this indicates that the valve core 2 may have abnormal movement. At this time, the refrigerant reversing valve will report the suspected stalling situation to the bus. After receiving the information, the bus will perform a certain period of delay processing to cope with the linkage operation of other related systems of the vehicle (for example, adjusting the operating status of other equipment associated with the refrigerant system, such as adjusting the air volume of the air-conditioning outlet according to the change of the refrigerant flow, etc.). At the same time, the bus will start the host computer self-learning program, control the refrigerant reversing valve to perform the initialization action, and then determine whether the initialization action is completed. If the initialization action is completed, then continue to run the first reversing action before, that is, continue to control the motor to rotate clockwise for the first target reversing step, and re-acquire the third collected signal number of the Hall sensor 7 in real time, and again determine whether the third signal quantity can be reached to complete the first reversing action. If the initialization action fails to complete, the stalling information is directly reported to the relevant monitoring system, prompting the operator or the vehicle's fault diagnosis module that the refrigerant reversing valve has a serious fault and may require manual inspection or further troubleshooting operations. If the Hall signal does not reach the specified number (W / 2±d) due to a small jam during normal commutation operation, a suspected jam will be reported to the bus. The initialization operating current is 1.5 times the normal commutation operating current. This initialization can flush out the small jam impurities.

[0043] In a preferred embodiment, after determining that the first reversing action of the refrigerant reversing valve is completed, the method further includes the following steps: If a second reversing instruction is received, the motor is controlled to compensate for the number of transmission hysteresis steps, and the fourth collected signal number of the Hall sensor 7 is obtained in real time; the second reversing instruction is an instruction to switch from the second refrigerant outlet 4 to the first refrigerant outlet 5; the fourth collected signal number is the jump count of the Hall sensor 7 during the process of the valve core 2 moving from the second refrigerant outlet 4 to the first refrigerant outlet 5; If the fourth collected signal number reaches the fourth signal quantity, it is determined that the hysteresis compensation is completed and the motor is controlled to rotate counterclockwise for the second target commutation step number, and the fifth collected signal number of the Hall sensor 7 during the rotation process is obtained in real time; wherein the second target commutation step number is the number of steps required for the travel drive motor from the second refrigerant outlet 4 to the first refrigerant outlet 5; the fourth signal quantity is obtained from the transmission hysteresis step number; If the fifth collected signal number is accumulated to the third signal amount, it is determined that the second reversing action of the refrigerant reversing valve is completed.

[0044] Specifically, because the running direction in the last step of initialization is consistent with the running direction to the second refrigerant outlet 4, the number of steps of clockwise operation in this step has covered this reversing hysteresis, so the above reversing process does not need to repeat the compensation of hysteresis, but when the second refrigerant outlet 4 turns to the first refrigerant outlet 5, it is necessary to compensate the transmission hysteresis. Specifically: when it is determined that the first reversing action of the refrigerant reversing valve is completed, if the second reversing instruction (i.e., the instruction to switch from the second refrigerant outlet 4 to the first refrigerant outlet 5) is received, the motor must first be controlled to compensate for the number of transmission hysteresis steps. In this process, the fourth collected signal number of the Hall sensor 7 is also obtained in real time, and the transmission hysteresis compensation is determined by monitoring this signal number. The transmission hysteresis is caused by the gap in the mechanical transmission structure such as the gear set of the refrigerant reversing valve, and the compensation of the transmission hysteresis step can ensure that the subsequent valve core 2 can move accurately according to the set stroke. Specifically, the number of steps for compensating the transmission hysteresis Zstep, the fourth signal quantity is (Z / 2±c), wherein the number of steps for compensating the transmission hysteresis is selected through a large number of experimental tests (during the experiment, the technicians may conduct detailed tests on the mechanical transmission structure of the refrigerant reversing valve, and measure the number of steps that the motor actually needs to rotate additionally in order to eliminate the transmission hysteresis under different working conditions (such as different refrigerant pressures, valve core 2 movement speeds, etc.) by simulating actual reversing operations. Then, these test data are statistically analyzed to find a range of steps that can effectively compensate for the transmission hysteresis in most cases, and finally the preferred parameters such as Z value and c value are determined). The Z value is preferably 70, and the c value is preferably 6. If the fourth collected signal number reaches the fourth signal quantity, it is determined that the hysteresis compensation is completed, and then the control system will control the motor to rotate counterclockwise for the second target commutation step number, and during the rotation of the motor, the fifth collected signal number of the Hall sensor 7 during the rotation process is continuously and in real time. Here, the second target commutation step number can be the same as or different from the first target commutation step number. Continue to compare the fifth collected signal number with the third signal quantity (the third signal quantity determined previously is reused here because it is a key indicator for judging whether the switching action from the second refrigerant outlet 4 to the first refrigerant outlet 5 is completed). If the fifth collected signal number accumulates to the third signal quantity, it is determined that the second switching action of the refrigerant reversing valve is completed, that is, the refrigerant flow direction switching from the second refrigerant outlet 4 to the first refrigerant outlet 5 is successfully achieved.

[0045] Furthermore, after obtaining the fourth collected signal number of the Hall sensor 7, the following steps are also included: If the fourth collected signal number does not reach the fourth signal quantity, it is determined that the hysteresis compensation is not completed, and the refrigerant reversing valve is controlled to perform an initialization action; If the refrigerant reversing valve completes the initialization action, the motor is controlled to rotate counterclockwise for the second target reversing step number, and the sixth collected signal number of the Hall sensor 7 during the rotation process is obtained in real time; If the sixth collected signal number is accumulated to the third signal amount, it is determined that the second reversing action of the refrigerant reversing valve is completed.

[0046] Specifically, if the hysteresis compensation is not completed, small jamming is likely to occur. The initialization operating current is 1.5 times the normal commutation operating current. This initialization can try to flush out the small jamming impurities. If the initialization action is completed, it means that the small jamming impurities are flushed and the commutation action can be continued with a high probability.

[0047] In a preferred embodiment, after determining that the second reversing action of the refrigerant reversing valve is completed, the method further includes the following steps: If the first commutation instruction is received again, the motor is controlled to compensate the transmission hysteresis step number, and the seventh collected signal number of the Hall sensor 7 is obtained in real time to determine whether the hysteresis compensation is completed; If the hysteresis compensation is completed, the motor is controlled to rotate clockwise for a first target commutation step number, and the eighth collected signal number of the Hall sensor 7 during the rotation process is obtained in real time; If the eighth collected signal number is accumulated to the third signal amount, it is determined that the first reversing action of the refrigerant reversing valve is completed.

[0048] Specifically, if the first reversing instruction is received again, it is also necessary to control the motor to compensate for the transmission hysteresis steps, and obtain the seventh collected signal number of the Hall sensor 7 in real time. By monitoring this signal number, it is judged whether the transmission hysteresis compensation is completed (the same as the above judgment method). After the hysteresis compensation is completed, the motor is controlled to rotate clockwise for the first target reversing steps, and the eighth collected signal number of the Hall sensor 7 during the rotation process is obtained in real time. The eighth collected signal number is continuously compared with the third signal quantity. If the eighth collected signal number accumulates to the third signal quantity, it is determined that the first reversing action of the refrigerant reversing valve is completed, and the refrigerant flow direction switching from the first refrigerant outlet 5 to the second refrigerant outlet 4 is realized again.

[0049] The refrigerant reversing valve in this application only hits the mechanical stop position (the first stop position and the second stop position) during the initialization process. The number of motor drive steps during the valve operation initialization is step, the number of motor driving steps when the valve is normally operated and reversed is Wstep, W< This initialization logic and normal operation reversing logic greatly reduce the number of times the mechanical stop is hit, thereby increasing the valve operating life.

[0050] 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 whole vehicle control method for a refrigerant reversing valve, characterized in that: The refrigerant reversing valve comprises at least a shell (6), wherein the shell (6) has a first space, wherein a motor and a magnetic rotor (1) connected to an output end of the motor are arranged in the first space, wherein the valve motor can drive the magnetic rotor (1) to rotate and drive a valve core (2) arranged in the first space to move along a first direction, wherein a coil is arranged outside the first space at a position corresponding to the magnetic rotor (1), and wherein a Hall sensor (7) is arranged outside the first space; wherein the shell (6) has a refrigerant inlet (3), a first refrigerant outlet (5) and a second refrigerant outlet (4), wherein along the first direction, the valve core (2) has a first stop position corresponding to the first refrigerant outlet (5), and a second stop position corresponding to the second refrigerant outlet (4); The method comprises the following steps: After receiving the first initialization instruction, the motor is controlled to rotate clockwise for a first target number of steps to drive the valve core (2) to move from the first stop position to the second stop position, and a first actual driving number of steps of the motor is acquired in real time; wherein the first target number of steps is the number of steps required for the motor to drive the full stroke from the first stop position to the second stop position; If the first actual driving step number reaches the first target step number, the motor is controlled to rotate counterclockwise by a second target step number to drive the valve core (2) to move from the second stop position to the first stop position, and the first collected signal number of the Hall sensor (7) is acquired in real time; wherein the second target step number is the number of steps required for the motor to drive the full stroke from the second stop position to the first stop position; If the first collected signal number is greater than or equal to the first signal quantity, the motor is controlled to rotate clockwise by a third target number of steps, and a second collected signal number of the Hall sensor (7) is acquired in real time; wherein the third target number of steps is the number of steps required for driving the motor to travel from the first stop position to the initialization position; and the first signal quantity is obtained from the first target number of steps or the second target number of steps; If the second collected signal number accumulates to a second signal quantity, it is determined that the refrigerant reversing valve completes the initialization action corresponding to the first initialization instruction; wherein, the second signal quantity is obtained by the third target step number.

2. The whole vehicle control method of the refrigerant reversing valve according to claim 1, characterized in that: The first semaphore is ,in is the first target number of steps or the second target number of steps, a is a compensation value, and the compensation value is obtained at least from the friction force, refrigerant pressure and mechanical component differences that the valve core (2) is subjected to when moving from the second stop position to the first stop position under actual working conditions.

3. The whole vehicle control method of the refrigerant reversing valve according to claim 1, characterized in that: The second semaphore is ,in is the third target step number, b is the fine-tuning value, and the fine-tuning value is obtained at least by the valve core movement accuracy, the Hall sensor accuracy and the refrigerant flow characteristics.

4. The whole vehicle control method of the refrigerant reversing valve according to claim 1, characterized in that: The initialization position is the position corresponding to the first refrigerant outlet (5); after determining that the refrigerant reversing valve has completed initialization, the following steps are also included: After receiving the first reversing instruction, the motor is controlled to rotate clockwise for a first target reversing step number, and a third collected signal number of the Hall sensor (7) during the rotation process is obtained in real time; wherein the first reversing instruction is an instruction to commutate from the first refrigerant outlet (5) to the second refrigerant outlet (4); the first target reversing step number is the number of steps required for the motor to travel from the first refrigerant outlet (5) to the second refrigerant outlet (4); If the third collected signal number accumulates to a third signal quantity, it is determined that the first reversing action of the refrigerant reversing valve is completed; wherein the third signal quantity is obtained by the first target reversing step number.

5. The whole vehicle control method of the refrigerant reversing valve according to claim 4 is characterized in that: After the real-time acquisition of the third collected signal number of the Hall sensor (7) during the rotation process, the following steps are also included: If the third collected signal number does not reach the third semaphore, reporting a suspected blockage to the bus; Controlling the refrigerant reversing valve to execute a second initialization instruction, and determining whether an initialization action corresponding to the second initialization instruction is completed; If yes, continue to run the first reversing action; if no, report the stall.

6. The whole vehicle control method of the refrigerant reversing valve according to claim 4, characterized in that: After determining that the first reversing action of the refrigerant reversing valve is completed, the following steps are also included: If a second reversing instruction is received, the motor is controlled to compensate for the number of transmission hysteresis steps, and a fourth collected signal number of the Hall sensor (7) is acquired in real time; the second reversing instruction is an instruction to reverse from the second refrigerant outlet (4) to the first refrigerant outlet (5); If the fourth collected signal number reaches the fourth signal quantity, it is determined that the hysteresis compensation is completed and the motor is controlled to rotate counterclockwise to the second target commutation step number, and the fifth collected signal number of the Hall sensor (7) during the rotation process is obtained in real time; wherein the second target commutation step number is the number of steps required for the travel driving motor from the second refrigerant outlet (4) to the first refrigerant outlet (5); the fourth signal quantity is obtained from the transmission hysteresis step number; If the fifth collected signal number is accumulated to the third signal amount, it is determined that the second reversing action of the refrigerant reversing valve is completed.

7. The whole vehicle control method of the refrigerant reversing valve according to claim 6, characterized in that: After obtaining the fourth collected signal number of the Hall sensor (7), the following steps are also included: If the fourth collected signal number does not reach the fourth signal quantity, it is determined that the hysteresis compensation is not completed, and the refrigerant reversing valve is controlled to perform an initialization action; If the refrigerant reversing valve completes the initialization action, the motor is controlled to rotate counterclockwise for a second target reversing step number, and the sixth collected signal number of the Hall sensor (7) during the rotation process is obtained in real time; If the sixth collected signal number is accumulated to the third signal amount, it is determined that the second reversing action of the refrigerant reversing valve is completed.

8. The whole vehicle control method of the refrigerant reversing valve according to claim 7, characterized in that: After determining that the second reversing action of the refrigerant reversing valve is completed, the following steps are also included: If the first commutation instruction is received again, the motor is controlled to compensate for the number of transmission hysteresis steps, and the seventh collected signal number of the Hall sensor (7) is acquired in real time to determine whether the hysteresis compensation is completed; If the hysteresis compensation is completed, the motor is controlled to rotate clockwise by a first target commutation step number, and an eighth collected signal number of the Hall sensor (7) during the rotation process is obtained in real time; If the eighth collected signal number is accumulated to the third signal amount, it is determined that the first reversing action of the refrigerant reversing valve is completed.

9. The whole vehicle control method of the refrigerant reversing valve according to claim 1, characterized in that: When the degree of forward wear of the valve core (2) in the direction from the first stop position to the second stop position is the same as the degree of reverse wear of the valve core (2) in the direction from the second stop position to the first stop position, the first target step number is the same as the second target step number; if the degree of forward wear is different from the degree of reverse wear, the first target step number is different from the second target step number.

10. The whole vehicle control method of the refrigerant reversing valve according to claim 9, characterized in that: The method also includes obtaining a first target number of steps and a second target number of steps; The obtaining of the first target number of steps and the second target number of steps specifically comprises the following steps: Acquiring the forward wear degree and the reverse wear degree; According to the forward wear degree, a first step compensation value is obtained, and according to the reverse wear degree, a second step compensation value is obtained; Obtain a reference target number of steps, obtain the first target number of steps based on the reference target number of steps and the first number of steps compensation value, and obtain the second target number of steps based on the reference target number of steps and the second number of steps compensation value; wherein the reference target number of steps is the number of motor drive steps required from the first refrigerant outlet (5) to the second refrigerant outlet (4) under ideal conditions.

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