Control circuit, method and device for an electronic valve

Abstract

The embodiment of the application discloses a control circuit, method and device of an electronic valve. The control circuit comprises a first capacitor, a second capacitor, a capacitor processing module and a control module; the first capacitor and the second capacitor are connected with the capacitor processing module respectively, and the capacitor processing module is used for outputting original position information of the electronic valve according to a first capacitance value output by the first capacitor and a second capacitance value output by the second capacitor; the capacitor processing module is connected with the control module to send the original position information, and the control module is used for driving the electronic valve to run to a target position referenced to the original position information. The technical scheme of the embodiment of the application is used for improving the collection accuracy of the absolute position of the electronic valve, and meanwhile, the service life is long, the cost is saved and safety is ensured.

Description

Technical Field

[0001] This invention relates to the field of electronic valve control technology, and in particular to a control circuit, method and device for an electronic valve. Background Technology

[0002] Electronic valves are fundamental automation components used to control fluids and belong to the actuator category. There are many types of electronic valves, each playing a different role in a control system. This allows electronic valves to be used with various circuits to achieve the desired control, ensuring both precision and flexibility. In mechatronics design, the precise positioning of electronic valves enables feedback and execution of mechanical design operations. The control system controls, provides feedback on, and adjusts the opening of the electronic valves, achieving precise positioning.

[0003] How to provide a control circuit, method, and device for an electronic valve to improve the accuracy of electronic valve position acquisition, while ensuring the service life of the electronic valve, saving costs, and ensuring safety, is a technical problem. Summary of the Invention

[0004] This invention provides a control circuit, method, and apparatus for an electronic valve, which improves the accuracy of electronic valve position acquisition, ensures the service life of the electronic valve, saves costs, and ensures safety.

[0005] In a first aspect, embodiments of the present invention provide a control circuit for an electronic valve, the control circuit including a first capacitor, a second capacitor, a capacitor processing module, and a control module;

[0006] The first capacitor and the second capacitor are respectively connected to the capacitor processing module, which is used to output the original position information of the electronic valve based on the first capacitance value output by the first capacitor and the second capacitance value output by the second capacitor.

[0007] The capacitor processing module is connected to the control module to send the original position information. The control module is used to drive the electronic valve to a target position with the original position information as a reference.

[0008] The technical solution of this invention includes a control circuit comprising a first capacitor, a second capacitor, a capacitor processing module, and a control module. The first capacitor and the second capacitor are respectively connected to the capacitor processing module. The capacitor processing module is used to output the original position information of the electronic valve based on the first capacitance value output by the first capacitor and the second capacitance value output by the second capacitor. The capacitor processing module is connected to the control module to send the original position information. The control module is used to drive the electronic valve to a target position with the original position information as a reference, thereby improving the accuracy of the acquisition of the absolute position of the electronic valve. Simultaneously, it has a long service life, saves costs, and is safe.

[0009] Secondly, embodiments of the present invention also provide a control method for an electronic valve, the control method comprising:

[0010] Obtain the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information;

[0011] After the electronic valve is powered on, it is determined whether the end position of the electronic valve is valid;

[0012] Based on the current location information and the result of the determination of whether it is valid, the starting point of the target position of the electronic valve is determined, so as to drive the electronic valve to run from the starting point of the target position to the target position.

[0013] The technical solution of this invention obtains the original position information of the electronic valve output by the capacitor processing module and determines the current position information of the electronic valve based on the original position information; after the electronic valve is powered on, it is determined whether the endpoint position of the electronic valve is valid; based on the current position information and the result of the determination of validity, the starting point of the target position of the electronic valve is determined, so as to drive the electronic valve to run from the starting point of the target position to the target position. Under the premise of improving the position feedback accuracy of the electronic valve, the automatic endpoint calibration function is realized, thereby improving the accuracy and consistency of individual electronic valve products.

[0014] Thirdly, embodiments of the present invention also provide a control device for an electronic valve, the control device comprising:

[0015] The current position information determination module is used to obtain the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information.

[0016] The validity determination module is used to determine whether the endpoint position of the electronic valve is valid after the electronic valve is powered on.

[0017] The position determination module is used to determine the starting point of the target position of the electronic valve based on the current position information and the result of the determination of validity, so as to drive the electronic valve to run from the starting point of the target position to the target position.

[0018] The technical solution of this invention includes a control device comprising: a current position information determination module, used to acquire the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information; a validity judgment module, used to determine whether the endpoint position of the electronic valve is valid after the electronic valve is powered on; and a position determination module, used to determine the starting point of the target position of the electronic valve based on the current position information and the result of the validity judgment, so as to drive the electronic valve to run from the starting point of the target position to the target position, thereby improving the position feedback accuracy of the electronic valve and realizing the automatic endpoint calibration function, thereby improving the accuracy and consistency of individual electronic valve products. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the capacitive sensor provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the connection of the control circuit of an electronic valve provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram illustrating the principle of position detection achieved by a capacitive sensor in the control circuit of an electronic valve provided in this embodiment of the invention.

[0022] Figure 4 This is a flowchart of an electronic valve control method provided in an embodiment of the present invention;

[0023] Figure 5 This is a flowchart of another electronic valve control method provided in an embodiment of the present invention;

[0024] Figure 6 This is a structural diagram of an electronic valve control device provided in an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0026] It should also be noted that, for ease of description, the accompanying drawings show only the parts relevant to the invention and not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but it may also have additional steps not included in the drawings. The process may correspond to a method, function, procedure, subroutine, subprogram, etc.

[0027] With the advancement of integrated chip technology, capacitive sensors are increasingly being used and have better application prospects. Furthermore, capacitive sensors can be used as position sensors for absolute position measurement in electronic valves.

[0028] Capacitive sensors operate by measuring changes in capacitance. They are collectors of charge and typically consist of two metal plates separated by a relatively thin layer of electrically insulating material or dielectric. This dielectric can be air or a non-conductive material such as plastic or ceramic. Simply put, a capacitive sensor can be described as... Figure 1 The diagram shown illustrates the principle of the capacitive sensor provided in this embodiment of the invention. (See also...) Figure 1 And by combining this with the following capacitance calculation formula, we can obtain:

[0029]

[0030] Where C = capacitance, ε = dielectric constant, A = overlapping area of ​​the circuit board, and d = distance between circuit boards;

[0031] The capacitance changes with the plate spacing (d) and the overlap of the plates (A). This phenomenon forms the basis of a capacitive displacement sensor, which measures the change in plate overlap (within A) in the planar direction during rotation. PCB technology can then be used to fabricate the capacitor plate. However, capacitance is also sensitive to factors other than displacement. If the capacitor plate is surrounded by air, its dielectric constant will change with temperature and humidity (because the dielectric constant of water differs from that of air). As seen in capacitive tactile sensors, the influence of nearby objects alters the dielectric constant of the surrounding environment, thus changing the capacitance. To eliminate this effect, differential acquisition can be used. Two capacitors can be formed using two plates of equal area and a shared plate. The capacitance values ​​(-C, +C) of these two capacitors can be measured simultaneously, and the difference between them can be used to obtain the angle of rotation.

[0032] In summary, a capacitive sensor can be used as the feedback of absolute position information for the electronic valve. For specific implementation methods, please refer to the following embodiments.

[0033] Figure 2 This is a connection diagram of a control circuit for an electronic valve provided in an embodiment of the present invention. This embodiment is applicable to situations requiring improved accuracy of the absolute position feedback information of the electronic valve. The control circuit of the electronic valve specifically includes:

[0034] First capacitor C1, second capacitor C2, capacitor processing module 110 and control module 120;

[0035] The first capacitor C1 and the second capacitor C2 are respectively connected to the capacitor processing module 110. The capacitor processing module 110 is used to output the original position information of the electronic valve according to the first capacitance value output by the first capacitor and the second capacitance value output by the second capacitor.

[0036] The capacitor processing module 110 is connected to the control module 120 to send the original position information. The control module 120 is used to drive the electronic valve to the target position of the electronic valve with reference to the original position information.

[0037] The capacitance range and specific implementation principle of the first capacitor C1 and the second capacitor C2 are described in detail in the following embodiments of the present invention, without any limitations.

[0038] The control module 120 can be a MCU (Microcontroller Unit) chip commonly used in this field. This embodiment does not impose any restrictions on it. See [link to relevant documentation]. Figure 1 The control module 120 is electrically connected to the capacitor processing module 110, and the control terminal of the control module 120 is connected to the motor.

[0039] In this embodiment, considering miniaturization and cost requirements, the capacitor processing module 110 can use a dedicated capacitor signal conditioning chip. Based on the above embodiments, the capacitor processing module 110 can be a discrete circuit or a capacitor signal conditioning chip.

[0040] The electrode design of the capacitive sensor utilizes the physical properties of a capacitor. Figure 3 This is a schematic diagram illustrating the principle of position detection achieved by a capacitive sensor in the control circuit of an electronic valve provided in this embodiment of the invention.

[0041] See Figure 2 and Figure 3 Based on the above embodiments, the first capacitor C1 includes a common electrode plate P0 and a first electrode plate P1, and the second capacitor C2 includes a common electrode plate P0 and a second electrode plate P2.

[0042] The common electrode plate P0, the first electrode plate P1, and the second electrode plate P2 are all connected to the capacitor processing module 110.

[0043] Specifically, the technical solution of this invention can be implemented by drawing three electrode plates—a first electrode plate P1, a second electrode plate P2, and a common electrode plate P0—on a PCB board. The electronic valve includes a valve core, a circuit board, and a motor. The motor includes a rotor that can drive the valve core to move. The first electrode plate P1, the second electrode plate P2, and the capacitor processing module 110 are fixedly connected to the circuit board. The common electrode plate P0 rotates synchronously with the rotor of the motor. The position of the electronic valve is determined by the positional relationship between the common electrode plate P0 and the first electrode plate P1 and the second electrode plate P2.

[0044] Among them, the first electrode plate P1 and the second electrode plate P2 are fixed electrode plates, and their sector angles are both 120°. The areas of the first electrode plate P1 and the second electrode plate P2 are the same. The common electrode plate P0 is a rotatable electrode plate, and its rotation direction is the same as the rotation direction of the motor, and its rotation angle is the same as the rotation angle of the motor.

[0045] See also Figure 3 The common electrode plate P0 is rotated counterclockwise. When the common electrode plate P0 is in its initial position, the second electrode plate P2 is completely covered by the common electrode plate P0, meaning that from the perspective of the diagram towards the inside, the second electrode plate P2 does not protrude from the common electrode plate P0. When the angle of the sector area corresponding to the region formed by the common electrode plate P0, the first electrode plate P1, and the second electrode plate P2 is 240°, then the area formed by the common electrode plate P0 and the first electrode plate P1 is P0 + P1 as shown in the diagram. Except for P1, P2, and P0, when the common electrode plate P0 is rotated counterclockwise by 120°, the first electrode plate P1 and the second electrode plate P2 are completely covered by the common electrode plate P0, meaning that from the perspective of the diagram towards the inside, the second electrode plate P2 and the first electrode plate P1 do not protrude from the common electrode plate P0. When the common electrode plate P0 is rotated counterclockwise by 240°, the first electrode plate P1 is completely covered by the common electrode plate P0, meaning that from the perspective of the diagram towards the inside, the first electrode plate P1 does not protrude from the common electrode plate P0.

[0046] Based on the above Figure 3 The capacitance value is calculated by rotating the electrode plate P0 in the same direction as the common electrode plate:

[0047] C=(P1-P2)*ε / d

[0048] Where d is the distance between the first electrode plate P1, the second electrode plate P2, and the common electrode plate P0; ε are all fixed values.

[0049] Optionally, the value of d can be in the range of 3mm-10mm.

[0050] Since the area of ​​the sector ring corresponding to the region formed by the first electrode plate P1 and the second electrode plate P2 is proportional to the rotation angle θ of the common electrode plate P0, the rotation angle can be used as the equivalent area. Furthermore, considering that ε and d are fixed values, they can be normalized to K0. Therefore, the capacitance formula can be equivalently expressed as:

[0051] C = |θ - 120| * K0

[0052] For details, please refer to [link / reference]. Figure 3 Let the position of the common electrode plate P0 in the left figure be defined as the starting angle of the common electrode plate 0°, and the position of the common electrode plate P0 in the right figure be defined as the ending angle of the common electrode plate P0 240°. In order to achieve the goal of obtaining the absolute position of the electronic valve, the selection range of θ is limited to 0 < θ < 240°. Therefore, when the rotation angle of the common electrode plate P0 is 0-120°, then C = -(120-θ)*K0; when the rotation angle of the common electrode plate P0 is 120-240°, then C = (θ-120)*K0.

[0053] The technical solution of this invention includes a control circuit comprising a first capacitor, a second capacitor, a capacitor processing module, and a control module. The first and second capacitors are respectively connected to the capacitor processing module. The first capacitance value output by the first capacitor and the second capacitance value output by the second capacitor can be input to the capacitor processing module. The capacitor processing module stores C = |θ - 120| * K0. The capacitor processing module obtains θ based on C = |θ - 120| * K0 and outputs the original position information of the electronic valve. The capacitor processing module is connected to the control module to send the original position information. The control module drives the electronic valve to a target position referenced by the original position information. This technical solution improves the accuracy of acquiring the absolute position of the electronic valve, while also offering a long service life, cost savings, and safety.

[0054] Figure 4 This is a flowchart illustrating a control method for an electronic valve according to an embodiment of the present invention. This embodiment is applicable to situations requiring improved accuracy of electronic valve position feedback information. The method can be executed by a control device for the electronic valve, which can be implemented through software and / or hardware. Specifically, it includes the following steps:

[0055] S410. Obtain the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information.

[0056] Specifically, the process involves acquiring the original position information of the electronic valve output by the capacitor processing module, and determining the current position information of the electronic valve based on the original position information. This includes acquiring multiple original position information, averaging the multiple original position information, and then filtering the data to obtain the current position information.

[0057] S420. After the electronic valve is powered on, determine whether the end position of the electronic valve is valid.

[0058] It is understood that, in this embodiment, since the capacitive sensor is related to the medium, temperature, and material, in order to eliminate the individual differences of the capacitive sensor and improve the consistency of the electronic valve product, and at the same time to improve the efficiency of the electronic valve position acquisition, an automatic calibration function is added to the control circuit of the electronic valve. When the capacitance processing module receives a control command for the first time or receives a special calibration instruction, the endpoint is calibrated once, that is, it is determined whether the endpoint position of the electronic valve is valid, so as to meet the feedback accuracy requirements of the capacitive position sensor.

[0059] S430. Determine the starting point of the target position of the electronic valve based on the current position information and the result of determining whether it is valid, so as to drive the electronic valve to run from the starting point of the target position to the target position.

[0060] Furthermore, the absolute position of the electronic valve is determined based on the current position information and the result of whether the determination is valid. This includes: if the end position of the electronic valve is invalid, the starting point of the target position of the electronic valve is determined based on the current position information after driving the electronic valve to operate in the forward and reverse directions.

[0061] It is understandable that after driving the electronic valve to operate in the forward and reverse directions, the electronic valve will operate to the forward end position when it operates in the forward direction, and to the reverse end position when it operates in the reverse direction, so as to perform automatic end point calibration logic, realize the calibration of the operating end point of the electronic valve, and improve the feedback accuracy of the absolute position of the electronic valve.

[0062] Specifically, after driving the electronic valve to operate in the forward direction, if the forward operation time of the electronic valve is less than the forward operation time threshold, the forward operation current of the electronic valve is greater than the forward operation current threshold, and the forward operation overcurrent count of the electronic valve is greater than the forward operation overcurrent count threshold, then the current position information is determined as the first endpoint position of the electronic valve, and the first endpoint position is the starting point of the target position of the electronic valve.

[0063] The first endpoint position corresponds to the electronic valve reaching the endpoint position during forward operation. The current position information determined here is the starting point of the electronic valve's target position, that is, the starting point of the target position corresponding to the electronic valve's forward operation.

[0064] After determining the current position information as the first endpoint position of the electronic valve, the method further includes: controlling the electronic valve to operate in reverse. If the reverse operation time of the electronic valve is less than the reverse operation time threshold, the reverse operation current of the electronic valve is greater than the reverse operation current threshold, and the reverse operation overcurrent count of the electronic valve is greater than the reverse operation overcurrent count threshold, then the current position information is determined as the second endpoint position of the electronic valve, and the second endpoint position is the starting point of the target position of the electronic valve.

[0065] The second endpoint position corresponds to the electronic valve's position when it reverses to the endpoint position. The current position information it determines is the starting point of the electronic valve's target position, that is, the starting point of the target position when the electronic valve reverses.

[0066] Based on the above embodiments, after determining whether the endpoint position of the electronic valve is valid, the method further includes: if the endpoint position of the electronic valve is valid, receiving a target position control command and target position information; controlling the electronic valve to operate to the target position corresponding to the target position information according to the target position control command, wherein the target position is the end point of the target position of the electronic valve.

[0067] The technical solution of this invention obtains the original position information of the electronic valve output by the capacitor processing module and determines the current position information of the electronic valve based on the original position information. After the electronic valve is powered on, it determines whether the endpoint position of the electronic valve is valid. Based on the current position information and the result of the validity determination, the starting point of the target position of the electronic valve is determined. This method for measuring the absolute position of the electronic valve adopts a non-contact approach, is not easily affected by temperature, has a long service life, and proposes an automatic endpoint calibration strategy for the electronic valve, improving the accuracy and consistency of individual products and effectively enhancing the accuracy of the position feedback information of the electronic valve products.

[0068] Figure 5 This is a flowchart illustrating another electronic valve control method provided in an embodiment of the present invention. This embodiment is an optimization based on the above embodiment.

[0069] Accordingly, the method in this embodiment specifically includes:

[0070] S510: Obtain the original position information of the electronic valve output by the capacitor processing module.

[0071] S520. Obtain multiple raw location information, and then filter the average value of the multiple raw location information to obtain the current location information.

[0072] S530. After the electronic valve is powered on, determine whether the end position of the electronic valve is valid. If yes, proceed to step S550; otherwise, proceed to step S5411.

[0073] Specifically, the validity of the endpoint position of the electronic valve is checked, and the automatic calibration logic is triggered after the electronic valve is powered on and a control command or calibration instruction is received for the first time.

[0074] S5411 drives the electronic valve to operate in the forward direction.

[0075] Force the electronic valve to operate in the forward direction.

[0076] S5412. Determine whether the forward operation time of the electronic valve is less than the forward operation time threshold. If yes, proceed to step S5413. If no, the endpoint calibration logic ends.

[0077] Check whether the calibrated running time of the electronic valve in the forward direction has exceeded the time limit, that is, determine whether the length of the forward operation time of the electronic valve is less than the threshold length of the forward operation time. The threshold length of the forward operation time is selected and set by those skilled in the art based on the actual operation time of the electronic valve. This embodiment does not impose any restrictions on it.

[0078] S5413. Determine whether the forward operating current of the electronic valve is greater than the forward operating current threshold. If yes, proceed to step S5414; otherwise, proceed to step S5411.

[0079] Check whether the calibrated forward operating current of the electronic valve is overcurrent, that is, determine whether the forward operating current of the electronic valve is greater than the forward operating current threshold. The forward operating current threshold shall be selected and set by those skilled in the art based on the actual operating current of the electronic valve. This embodiment does not impose any restrictions on it.

[0080] S5414. Determine whether the number of forward operation overcurrents of the electronic valve is greater than the threshold number of forward operation overcurrents. If yes, proceed to step S5415; otherwise, proceed to step S5416.

[0081] Check whether the calibrated number of forward operation flow rates of the electronic valve is sufficient, that is, determine whether the number of forward operation flow rates of the electronic valve is greater than the threshold number of forward operation flow rates. The threshold number of forward operation flow rates shall be selected and set by those skilled in the art based on the actual number of operation flow rates of the electronic valve, and no limitation shall be imposed on it in this embodiment.

[0082] S5415. Determine the current position information as the first endpoint position of the electronic valve. The first endpoint position is the starting point of the target position of the electronic valve.

[0083] S5416. After the electronic valve is driven to reverse for the first threshold time, step S5411 is executed.

[0084] Specifically, the electronic valve is forced to reverse, i.e., the electronic valve is driven to reverse for a first threshold time. Optionally, the value of the first threshold time is in the range of 300ms-500ms.

[0085] S5421, drives the electronic valve to operate in reverse.

[0086] The electronic valve is forced to operate in reverse.

[0087] S5422. Determine whether the reverse operation time of the electronic valve is less than the reverse operation time threshold. If yes, proceed to step S5423. If no, the endpoint calibration logic ends.

[0088] Check whether the calibrated running time of the electronic valve in reverse operation has exceeded the time limit, that is, determine whether the reverse operation time length of the electronic valve is less than the reverse operation time length threshold. The reverse operation time length threshold is selected and set by those skilled in the art based on the actual running time of the electronic valve. This embodiment does not impose any restrictions on it.

[0089] S5423. Determine whether the reverse operating current of the electronic valve is greater than the reverse operating current threshold. If yes, proceed to step S5424; otherwise, proceed to step S5421.

[0090] Check whether the rated operating current of the electronic valve in reverse operation is too high, that is, determine whether the reverse operating current of the electronic valve is greater than the reverse operating current threshold. The reverse operating current threshold shall be selected and set by those skilled in the art based on the actual operating current of the electronic valve. This embodiment does not impose any restrictions on it.

[0091] S5424. Determine whether the number of reverse operation overcurrents of the electronic valve is greater than the threshold number of reverse operation overcurrents. If yes, proceed to step S5426; otherwise, proceed to step S5425.

[0092] Check whether the calibrated number of reverse operation overcurrents of the electronic valve is sufficient, that is, determine whether the number of reverse operation overcurrents of the electronic valve is greater than the threshold number of reverse operation overcurrents. The threshold number of reverse operation overcurrents is selected and set by those skilled in the art based on the actual number of operation overcurrents of the electronic valve, and this embodiment does not impose any restrictions on it.

[0093] S5425. After the electronic valve is driven to reverse for the second threshold time, step S5421 is executed.

[0094] Specifically, the electronic valve is forced to operate in the reverse direction for a second threshold time, which can be selected as a value between 300ms and 500ms.

[0095] S5426. Determine whether the forward operation time of the electronic valve is less than the calibrated forward operation time. If yes, proceed to step S5427. If no, the endpoint calibration logic ends.

[0096] The forward operation calibration time of the electronic valve is checked again to see if it meets the requirement. That is, it is determined whether the forward operation time of the electronic valve is less than the calibration forward operation time. The calibration forward operation time is selected and set by those skilled in the art based on the actual operation calibration forward operation time of the electronic valve. This embodiment does not impose any restrictions on it.

[0097] S5427. Determine the current position information as the second endpoint position of the electronic valve. The second endpoint position is the starting point of the target position of the electronic valve.

[0098] S550 receives target position control commands and target position information.

[0099] S560: Control the electronic valve to operate to the target position corresponding to the target position information according to the target position control command. The target position is the end point of the electronic valve's target position.

[0100] The target position is the endpoint of the electronic valve's target position, which is the end point of the electronic valve's current operation.

[0101] Figure 6 This is a structural diagram of a control device for an electronic valve provided in an embodiment of the present invention. This embodiment can be applied to situations where the accuracy of electronic valve position feedback information needs to be improved.

[0102] like Figure 6 As shown, the control device includes: a current position information determination module 610, a validity determination module 620, and an absolute position determination module 630, wherein:

[0103] The current position information determination module 610 is used to obtain the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information.

[0104] The valid judgment module 620 is used to determine whether the endpoint position of the electronic valve is valid after the electronic valve is powered on.

[0105] The position determination module 630 is used to determine the starting point of the target position of the electronic valve based on the current position information and the result of determining whether it is valid, so as to drive the electronic valve to run from the starting point of the target position to the target position.

[0106] The electronic valve control device of this embodiment acquires the original position information of the electronic valve output by the capacitor processing module and determines the current position information of the electronic valve based on the original position information. After the electronic valve is powered on, it determines whether the endpoint position of the electronic valve is valid. Based on the current position information and the result of the validity determination, it determines the starting point of the target position of the electronic valve, so as to drive the electronic valve to run from the starting point of the target position to the target position. This electronic valve control device is non-contact, not easily affected by temperature, and has a long service life. At the same time, it proposes an automatic endpoint calibration strategy for electronic valves, which improves the accuracy and consistency of individual products and effectively enhances the accuracy of position feedback information of electronic valve products.

[0107] Based on the above embodiments, the current position information of the electronic valve is determined according to the original position information, including:

[0108] Multiple raw location information is obtained, and the average value of the multiple raw location information is then filtered to obtain the current location information.

[0109] Based on the above embodiments, the starting point of the target position of the electronic valve is determined according to the current position information and the result of whether it is valid, including:

[0110] If the endpoint position of the electronic valve is invalid, the starting point of the target position of the electronic valve is determined based on the current position information after driving the electronic valve to run in the forward and reverse directions.

[0111] Based on the above embodiments, after driving the electronic valve to operate in the forward and reverse directions, the starting point of the target position of the electronic valve is determined according to the current position information, including:

[0112] After the electronic valve is driven to operate in the forward direction, if the forward operation time of the electronic valve is less than the forward operation time threshold, the forward operation current of the electronic valve is greater than the forward operation current threshold, and the forward operation overcurrent count of the electronic valve is greater than the forward operation overcurrent count threshold, then the current position information is determined as the first endpoint position of the electronic valve, and the first endpoint position is the starting point of the target position of the electronic valve.

[0113] Based on the above embodiments, after determining that the current position information is the first endpoint position of the electronic valve, the method further includes:

[0114] If the reverse operation of the electronic valve is controlled, and the reverse operation time is less than the reverse operation time threshold, the reverse operation current is greater than the reverse operation current threshold, and the reverse operation overcurrent count is greater than the reverse operation overcurrent count threshold, then the current position information is determined as the second endpoint position of the electronic valve, and the second endpoint position is the starting point of the target position of the electronic valve.

[0115] Based on the above embodiments, after determining whether the endpoint position of the electronic valve is valid, the method further includes:

[0116] If the endpoint position of the electronic valve is valid, then the target position control command and target position information are received.

[0117] The electronic valve is controlled to operate to the target position corresponding to the target position information according to the target position control command. The target position is the end point of the electronic valve's target position.

[0118] The electronic valve control device provided in the above embodiments can execute the electronic valve control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the electronic valve control method.

[0119] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A control circuit for an electronic valve, characterized in that, It includes a first capacitor, a second capacitor, a capacitor processing module, and a control module; The first capacitor and the second capacitor are respectively connected to the capacitor processing module, which is used to output the original position information of the electronic valve based on the first capacitance value output by the first capacitor and the second capacitance value output by the second capacitor. The capacitor processing module is connected to the control module to send the original position information. The control module is used to drive the electronic valve to a target position with the original position information as a reference. The control circuit of the electronic valve is used to determine the current position information of the electronic valve based on the original position information of the electronic valve. After the electronic valve is powered on, it determines whether the endpoint position of the electronic valve is valid. Based on the current position information and the result of the determination of validity, it determines the starting point of the target position of the electronic valve, so as to drive the electronic valve to run from the starting point of the target position to the target position. The first capacitor includes a common electrode plate and a first electrode plate, the second capacitor includes the common electrode plate and a second electrode plate, and the capacitor processing module is a discrete circuit or a capacitor signal conditioning chip.

2. The control circuit according to claim 1, characterized in that, The common electrode plate, the first electrode plate, and the second electrode plate are all connected to the capacitor processing module.

3. The control circuit according to claim 2, characterized in that, The electronic valve includes a circuit board and a motor, wherein the first electrode plate, the second electrode plate, and the capacitor processing module are fixedly connected to the circuit board, and the common electrode plate rotates synchronously with the rotor of the motor.

4. A control method for an electronic valve, characterized in that, The electronic valve includes a first capacitor, a second capacitor, and a capacitor processing module. The first capacitor and the second capacitor are respectively connected to the capacitor processing module. The first capacitor includes a common electrode plate and a first electrode plate, and the second capacitor includes the common electrode plate and a second electrode plate. The capacitor processing module is a discrete circuit or a capacitor signal conditioning chip. The control method includes: Obtain the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information; After the electronic valve is powered on, it is determined whether the end position of the electronic valve is valid; Based on the current location information and the result of the determination of whether it is valid, the starting point of the target position of the electronic valve is determined, so as to drive the electronic valve to run from the starting point of the target position to the target position.

5. The control method according to claim 4, characterized in that, Determining the current position information of the electronic valve based on the original position information includes: The current location information is obtained by averaging multiple original location information and then filtering the average value of the multiple original location information.

6. The control method according to claim 4, characterized in that, Determining the starting point of the target position of the electronic valve based on the current position information and the result of the validity determination includes: If the endpoint position of the electronic valve is invalid, the starting point of the target position of the electronic valve is determined based on the current position information after driving the electronic valve to operate in the forward and reverse directions.

7. The control method according to claim 6, characterized in that, After driving the electronic valve to operate in both the forward and reverse directions, the starting point of the target position of the electronic valve is determined based on the current position information, including: After driving the electronic valve to operate in the forward direction, if the forward operation time of the electronic valve is less than the forward operation time threshold, the forward operation current of the electronic valve is greater than the forward operation current threshold, and the forward operation overcurrent count of the electronic valve is greater than the forward operation overcurrent count threshold, then the current position information is determined to be the first endpoint position of the electronic valve, and the first endpoint position is the starting point of the target position of the electronic valve.

8. The control method according to claim 7, characterized in that, After determining that the current position information is the first endpoint position of the electronic valve, the method further includes: If the electronic valve is controlled to operate in reverse, and the reverse operation time of the electronic valve is less than the reverse operation time threshold, the reverse operation current of the electronic valve is greater than the reverse operation current threshold, and the reverse operation overcurrent count of the electronic valve is greater than the reverse operation overcurrent count threshold, then the current position information is determined to be the second endpoint position of the electronic valve, and the second endpoint position is the starting point of the target position of the electronic valve.

9. The control method according to claim 4, characterized in that, After determining whether the endpoint position of the electronic valve is valid, the process further includes: If the endpoint position of the electronic valve is valid, then the target position control command and target position information are received; The electronic valve is controlled to operate to the target position corresponding to the target position information according to the target position control command, and the target position is the end point of the target position of the electronic valve.

10. A control device for an electronic valve, characterized in that, Also includes: The current position information determination module is used to obtain the original position information of the electronic valve output by the capacitor processing module, and determine the current position information of the electronic valve based on the original position information. The validity determination module is used to determine whether the endpoint position of the electronic valve is valid after the electronic valve is powered on. The position determination module is used to determine the starting point of the target position of the electronic valve based on the current position information and the result of the determination of whether it is valid, so as to drive the electronic valve to run from the starting point of the target position to the target position; The electronic valve includes a first capacitor, a second capacitor, and a capacitor processing module. The first capacitor and the second capacitor are respectively connected to the capacitor processing module. The capacitor processing module is used to output the original position information of the electronic valve according to the first capacitance value output by the first capacitor and the second capacitance value output by the second capacitor. The first capacitor includes a common electrode plate and a first electrode plate, and the second capacitor includes the common electrode plate and a second electrode plate. The capacitor processing module is a discrete circuit or a capacitor signal conditioning chip.

Images