A motor valve control system based on a logic drive control chipset

Abstract

This invention provides a motor valve control system based on a logic-driven control chipset, comprising a motor valve body, a permanent magnet DC motor, and a control chipset. The permanent magnet DC motor and the control chipset are disposed within the motor valve body. The control chipset includes an MCU main control chip, a current detection circuit, and a motor drive chip. This invention achieves intelligent control of the motor valve through a logic-driven control chipset, eliminating the need for mechanical reduction mechanisms and position sensors. This simplifies the structure, improves control reliability, and supports information management functions such as device ID binding and on / off count statistics, significantly improving the long-term operational reliability and environmental adaptability of the motor valve.

Description

Technical Field

[0001] This invention relates to the field of metering instrument technology, and in particular to a motor valve control system based on a logic-driven control chipset. Background Technology

[0002] With the development of science and technology, more and more smart devices are being applied to daily life. Examples include early IC card meters, CPU card meters, and ultrasonic meters. Ultimately, all these smart devices rely on the opening and closing control of valves, which leads to increasingly higher requirements for the control of motor valves.

[0003] Motor-driven valves (motor valves) are widely used in household smart meters to control the flow of fluids. Traditional motor valve control systems typically employ open-loop control or simple on / off control. The controller outputs a switching signal to rotate the permanent magnet DC motor forward or backward, opening or closing the valve. However, this control method suffers from drawbacks such as low accuracy and the inability to monitor valve status in real time. With technological advancements, some improved solutions, such as the introduction of feedback control, have been developed to enhance the on / off control accuracy of motor valves. However, this increases the mechanical complexity of the valve and reduces its reliability.

[0004] Currently, most motorized valves use miniature permanent magnet DC motors with high rated speeds and low torque. These require mechanical reduction mechanisms to increase the output torque and drive the valve stem for reliable valve switching. The reduction mechanisms are complex and, due to cost considerations, often use injection-molded components, resulting in low long-term operational reliability and environmental adaptability of the motorized valves. Furthermore, the motorized valves may lack an output signal or provide only a simple stop signal when in position, leading to unreliable valve status.

[0005] Therefore, there is an urgent need for a motor valve control system with a simplified structure, reliable control, and traceable status to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0006] To address the aforementioned problems, the purpose of this invention is to provide a motor valve control system based on a logic-driven control chipset.

[0007] This invention provides a motor valve control system based on a logic-driven control chipset, comprising: a motor valve body, a permanent magnet DC motor, a control chipset, and a four-wire connection terminal. The permanent magnet DC motor and the control chipset are disposed within the motor valve body. The control chipset includes an MCU main control chip, a current detection circuit, and a motor drive chip. The MCU main control chip is used to receive control commands from an external main control system via a communication line, respond to the control commands by controlling the permanent magnet DC motor to run via the motor drive chip, and return valve status and working data to the external main control board via the communication line. A current detection circuit, connected to the MCU main control chip, is used to collect the operating current of the permanent magnet DC motor in real time and feed it back to the MCU main control chip. The four-wire connection terminal includes two power lines and two communication lines, used to connect to an external main control system to achieve power supply and data communication.

[0008] Optionally, the MCU main control chip is used to compare the motor current with a preset current threshold. When the current exceeds the threshold and continues for a certain period of time, it is determined that the valve has reached the limit position. At this time, the MCU main control chip issues a stop command to cut off the motor drive output and stop the motor. At the same time, the MCU main control chip records the current position state of the valve for subsequent status query.

[0009] Optionally, the permanent magnet DC motor is a low-speed, high-torque micro permanent magnet DC motor.

[0010] Optionally, the technical parameters of the low-speed, high-torque micro permanent magnet DC motor are: operating voltage 2.5V~6V, operating current ≤80mA, stall torque ≥8.2N·mm, stall current ≤220mA, motor radius ≤30mm, and rated speed less than 600rpm.

[0011] Optionally, the low-speed, high-torque micro permanent magnet DC motor uses permanent magnet material with a residual magnetism of not less than 0.4T at room temperature. The magnetic field strength is enhanced by increasing the thickness of the permanent magnet, and the wire diameter of the winding is reduced while the number of turns is increased to increase the resistance and reduce the stall current. At the same time, the torque loss caused by the reduction in wire diameter is compensated by increasing the number of turns.

[0012] Optionally, the MCU main control chip communicates with the external main control system at TTL level through the two communication lines, following a custom serial communication protocol, receiving valve switching commands, parameter configuration commands, and data query commands, and feeding back valve status information, cumulative number of switching times, and device ID information.

[0013] Optionally, the MCU main control chip includes: The instruction parsing module is used to receive and parse control instructions from the external main control system and verify the legality of the instructions; The motor control module is used to output control signals to the motor drive chip, so that the permanent magnet DC motor can rotate forward or reverse to realize the valve opening or closing action; The current monitoring module is used to collect the motor current value in real time through the current detection circuit; The position determination module is used to compare the collected motor current value with the preset current threshold. When the current exceeds the threshold and continues for a set time, it determines that the valve has reached the fully open or fully closed position and controls the motor drive chip to stop outputting so that the motor stops rotating. The status recording module is used to record the current position status of the valve to a non-volatile memory.

[0014] Optionally, the motor valve body includes a motor valve housing and a pull rod assembly disposed within the motor valve housing; The pull rod assembly is connected to the permanent magnet DC motor and is also connected to the motor valve seal; the permanent magnet DC motor directly drives the motor valve seal without the need for a mechanical reduction mechanism.

[0015] Optionally, the motor valve body may further include a motor valve rear cover adapted to the motor valve housing.

[0016] Optionally, the rear cover of the motor valve is provided with a lead wire outlet, and a lead wire sealing sleeve and a lead wire seal are provided at the lead wire outlet.

[0017] Optionally, the motor shaft of the permanent magnet DC motor is connected to the tie rod assembly via a thread, and the motor shaft is also provided with a motor shaft sealing ring.

[0018] The motor valve control system based on a logic-driven control chipset of the present invention eliminates the mechanical reduction mechanism, thereby simplifying the internal structure of the valve body. At the same time, it incorporates electronic circuitry to control the drive motor, controls the valve opening and closing according to the gas meter communication commands, and provides the valve opening and closing status, simplifying the gas meter control circuit and method, and significantly improving long-term operational reliability and environmental adaptability.

[0019] This invention achieves intelligent control of motor valves through a logic-driven control chipset, eliminating the need for mechanical reduction mechanisms and position sensors. This simplifies the structure, ensures reliable control, and supports information management functions such as device ID binding and switch count statistics, significantly improving the long-term operational reliability and environmental adaptability of motor valves.

[0020] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a functional diagram of the control chipset according to an embodiment of the present invention; Figure 2 This is a three-dimensional schematic diagram of the motor valve according to an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the motor valve according to an embodiment of the present invention; Figure 4 This is a side view of the motor valve according to an embodiment of the present invention; Figure 5 This is a circuit diagram of the control chip group for the motor valve in an embodiment of the present invention. Detailed Implementation

[0022] The embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the present invention and are not restrictive.

[0023] This invention provides a motor valve control system based on a logic-driven control chipset, particularly suitable for motor valve control used in smart diaphragm gas meters and water meters. The motor valve control system based on a logic-driven control chipset of this invention includes: a motor valve body, a permanent magnet DC motor, a control chipset, and four-wire connection terminals.

[0024] The permanent magnet DC motor and control chipset are housed within the motor valve body. The control chipset includes an MCU main control chip, a current detection circuit, and a motor drive chip. The MCU main control chip receives control commands from an external main control system via a communication line, responds to the control commands by controlling the permanent magnet DC motor to operate through the motor drive chip, and returns valve status and operating data to the external main control board via the communication line.

[0025] In other words, the control chipset in this embodiment is a dedicated integrated circuit that integrates a microcontroller (MCU), a motor drive logic chip, and a current detection circuit. It has a communication interface and I / O control functions for executing control algorithms and communicating with the main control board. Combined with... Figure 1 As can be seen, the control chipset in this embodiment has multiple functions, such as drive time adjustment, device ID configuration, current detection position judgment, cumulative switching count, and control of motor valve body. Figure 5 This is a schematic diagram of the control chipset circuit in this embodiment. Figure 5 In the circuit diagram shown in Figure a, U1 is the motor drive chip, U2 is the MCU main control chip, and resistors R1 and R6 connected to power supply VCC2 form a current detection circuit.

[0026] The motor valve control system based on the logic-driven control chipset in this embodiment also includes a current detection circuit and a four-wire connection terminal. The current detection circuit is connected to the MCU main control chip and is used to collect the operating current of the permanent magnet DC motor in real time and feed it back to the MCU main control chip. The four-wire connection terminal includes two power lines and two communication lines, which are used to connect to an external main control system to realize power supply and data communication.

[0027] The motor valve control is connected to an external main control system (such as the main control system of a gas meter or water meter) via a four-wire connection terminal. Two of these wires are power lines, providing DC power to the control chip and motor drive. The other two are communication lines used to transmit data signals between the control chip and the motherboard. This embodiment of the invention uses a two-wire custom protocol for communication; the control chips exchange commands and data through this custom communication protocol.

[0028] The MCU main control chip communicates with the external main control system at TTL level through the two communication lines, following a custom serial communication protocol. It receives valve switching commands, parameter configuration commands, and data query commands, and feeds back valve status information, cumulative number of switching times, and device ID information.

[0029] The MCU main control chip includes: an instruction parsing module, a motor control module, a current monitoring module, a position determination module, and a status recording module.

[0030] The instruction parsing module is used to receive and parse control instructions from the external main control system and verify the legality of the instructions; The motor control module is used to output control signals to the motor drive chip, so that the permanent magnet DC motor can rotate forward or reverse to realize the valve opening or closing action; The current monitoring module is used to collect the motor current value in real time through the current detection circuit; The position determination module is used to compare the collected motor current value with the preset current threshold. When the current exceeds the threshold and continues for a set time, it determines that the valve has reached the fully open or fully closed position and controls the motor drive chip to stop outputting so that the motor stops rotating. The status recording module is used to record the current position status of the valve to a non-volatile memory.

[0031] The MCU main control chip in this embodiment can also read the number of times the valve is opened and closed, set the drive time, set the valve ID number (the main control board can be bound to the valve ID), and determine the valve position by detecting the motor current, etc.

[0032] The MCU main control chip in this embodiment has an internal switch count counter. This counter value is stored in non-volatile memory to ensure data is not lost after power failure. The smart meter connected to the motor valve can be set to the time (drive time) required for the valve to go from fully open to fully closed according to actual needs.

[0033] In this embodiment, the MCU main control chip can be preset with a default ID at the factory. The user can reprogram it by sending an ID setting command to the host computer. The device ID can be a numeric number or an address code.

[0034] The control chip of this invention is connected to a current detection circuit to monitor the motor current value. When the motor drives the valve, the motor load is relatively stable and the current remains within the normal operating range before the valve reaches the fully open or fully closed position. Once the valve reaches the mechanical limit position of fully open or fully closed, the motor will stall, and the motor current will rise rapidly and exceed the normal operating current. The MCU main control chip is also used to compare the motor current with a preset current threshold. When the current exceeds the threshold and persists for a certain period of time (to avoid misjudging instantaneous current spikes), it is determined that the valve has reached the limit position. At this time, the control chip immediately issues a stop command, cuts off the motor drive output, and stops the motor. At the same time, the control chip records the current position state of the valve (fully open or fully closed) for subsequent status query. Through the above current feedback control mechanism, the solution of this embodiment of the invention can realize the detection of valve position and automatic stop control without installing additional limit switches or position sensors on the valve.

[0035] When applied to smart meters, the one-meter-one-valve design prevents the motor valve from being opened or closed by simple operations. The valve position can be determined by detecting the drive motor current, simplifying the motor valve control scheme and improving reliability.

[0036] In this embodiment, the preferred permanent magnet DC motor is a low-speed, high-torque micro permanent magnet DC motor. The technical parameters of this low-speed, high-torque micro permanent magnet DC motor are: operating voltage 3V, operating current ≤80mA, stall torque ≥8.2N·mm, stall current ≤220mA, motor radius ≤30mm, and rated speed less than 600rpm.

[0037] The low-speed, high-torque micro permanent magnet DC motor in this embodiment uses permanent magnet material with a residual magnetism of not less than 0.4T at room temperature. The magnetic field strength is enhanced by increasing the thickness of the permanent magnet. The wire diameter of the winding is reduced and the number of turns is increased to increase the resistance and reduce the stall current. At the same time, the torque loss caused by the reduction in wire diameter is compensated by increasing the number of turns.

[0038] like Figures 2-5As shown, the motor valve body includes a motor valve housing 1 and a pull rod assembly 5 disposed within the motor valve housing 1. The pull rod assembly 5 is connected to a permanent magnet DC motor 7 and is also connected to a motor valve seal 4. The permanent magnet DC motor 7 directly drives the motor valve seal 4 without a mechanical reduction mechanism. The motor shaft of the permanent magnet DC motor 7 is connected to the pull rod assembly 5 via a thread. The pull rod assembly 5 consists of a trapezoidal threaded insert and a rotating disk. The insert of the pull rod assembly 5 is threadedly connected to the permanent magnet DC motor 7, and the motor valve seal 4 is fitted onto the rotating disk of the pull rod assembly 5. The permanent magnet DC motor 7 directly drives the motor shaft to rotate, and the threaded transmission causes the pull rod assembly to move up and down along the guide groove at the upper end of the motor valve housing 1, achieving the valve opening, valve closing, and valve sealing effects. When the motor rotates, it directly drives the motor valve seal 4 (piston head) to move up and down via threaded transmission without a mechanical reduction mechanism. A motor shaft sealing ring 6 is also provided on the motor shaft. The motor valve is connected to the main control board of an external gas meter or water meter via a four-wire connection terminal 11.

[0039] A control chip group 8 is installed inside the motor valve housing 1. The control chip group 8 integrates an MCU main control chip, a motor drive chip, and a current detection circuit. In this embodiment, the motor valve can also have a built-in motor control circuit (the motor drive chip, together with external resistors, capacitors, and other components, controls the motor), which fixes the valve control parameters. The gas meter controls the valve via communication commands. The gas meter control circuit and control method are simplified, unified, and universal, effectively improving the reliability of the valve control.

[0040] The motor valve also includes a motor valve rear cover 2 adapted to the motor valve housing 1. The motor valve housing 1 and the motor valve rear cover 2 can be interference-fitted together, and the two together form a sealed cavity for installing other components of the motor valve, such as a low-speed, high-torque micro permanent magnet DC motor and a control circuit board, which are installed in this cavity.

[0041] The rear cover 2 of the motor valve is provided with a lead wire outlet, at which a lead wire sealing sleeve 9 and a lead wire seal 10 are provided. The lead wire seal 10 fastens and presses the lead wire sealing sleeve 9 onto the rear cover 2 of the motor valve to achieve a line seal. The motor valve interface 3 is fastened to the motor valve housing 1 and is used to cooperate with the motor valve seal 4 to achieve pipeline on / off control. The motor valve interface 3 is located on the side wall of the motor valve housing 1 and is used to connect to external gas or water pipelines, serving as the passage for fluid to enter and exit the valve. The motor valve seal 4 moves up and down under the drive of the motor, cooperating with the motor valve interface to achieve pipeline on / off control. The motor shaft of the permanent magnet DC motor 7 is connected to the tie rod assembly 5 by threads, and the motor shaft is also provided with a motor shaft seal ring 6, which ensures the sealing of the protruding part of the motor shaft.

[0042] The lead wire sealing sleeve 9 is located at the lead wire outlet of the motor valve rear cover 2 or the motor valve housing 1. The lead wire seal 10 (such as a rubber sealing ring or potting compound) is installed inside the lead wire sealing sleeve 9 to wrap the wires led out from the control board, thereby achieving sealed lead-out of the electrical lead wires and preventing gas or water leakage.

[0043] The electronic motor valve in this embodiment uses a low-speed, high-torque micro permanent magnet DC motor to directly drive the motor valve seal 4, eliminating the mechanical reduction mechanism and simplifying the structure. At the same time, the built-in electronic circuit (i.e., motor drive circuit) controls the drive motor, controls the valve opening and closing according to the gas meter communication command, and provides the valve opening and closing status, simplifying the gas meter control circuit and method, and significantly improving long-term operational reliability and environmental adaptability.

[0044] Figure 5 The circuit diagram of the control chipset is shown, where a is the motor valve output circuit, b is the communication interface circuit, c is the MCU main control chip related circuit, and d is the power surge filter circuit. In the figure, U1 is the motor drive chip, which can be a PT2466 chip; U2 is the MCU main control chip, which can be an HK32G003J4M7 chip; J2 is a four-wire connection terminal (11), which serves as the power and communication interface.

[0045] In this embodiment, the electronic motor valve is a component of the smart gas meter. Its power supply and operation are controlled by the smart gas meter. The smart gas meter and the electronic motor valve communicate via TTL level to achieve status interaction and valve on / off control. For ease of description, this embodiment uses the master unit to represent the smart gas meter and the slave unit to represent the electronic motor valve. The control flow is as follows: (1) Under normal conditions, the host cuts off the power supply to the slave, the slave control circuit board is not powered, and the valve remains in the current open / closed state to achieve zero power consumption standby; wherein, the host can wake up the slave hardware by powering on the slave. (2) When the valve needs to be switched on or off, the host first powers on the slave and waits for an appropriate time (e.g., 100ms) for the slave to complete initialization; (3) The host sends control commands to the slave through the communication line. The commands must include the target device ID to ensure one-to-one control. (4) After receiving the instruction, the slave logic drive control chip group first performs a legality check: verifying the matching of the frame header, checksum and device ID. If the instruction is illegal or the ID does not match, it will not be executed and will not be responded to. (5) After the verification is passed, the instruction content is parsed and it is determined whether it is a valve opening instruction, valve closing instruction, parameter configuration instruction or data query instruction; (6) If it is a valve switching command, the MCU main control chip internally controls the voltage levels of pins 3, 5, and 8 to control pins 5, 6, and 7 of the motor drive circuit U1, thereby controlling the voltage level changes of pins 2 and 3 of the motor drive circuit U1 to control the motor operation and realize the valve switching action. At the same time, the timer is started, and ADC sampling is started through pin 1 of the MCU main control chip to continuously collect the motor current; (7) During the valve movement, the motor load is relatively stable and the current is maintained within the normal operating range (approximately 50~80mA). (8) When the valve reaches the mechanical limit position of fully open or fully closed, the motor stalls and the current rises rapidly to the stall current (about 150~220mA). (9) The MCU main control chip compares the collected current with the preset stall threshold (e.g., 120mA) in real time. When the current exceeds the threshold and the duration exceeds the anti-false judgment delay (e.g., 200ms), it is determined that the valve is in place. In actual application, if the current exceeding the threshold is not detected continuously, it is considered that the valve is "not in place" or "not in place".

[0046] (10) The MCU main control chip immediately adjusts the high and low levels of pins 3, 5 and 8 to control the motor drive circuit to stop output, the motor stops rotating, and at the same time records the current valve position status (fully open or fully closed) to non-volatile memory; (11) The logic drive control chipset responds to the host via the communication line with the command execution result, including the current valve status, the peak current of the valve switching action, the cumulative number of switching times, the device ID, and other information; (12) After receiving the response, the host can choose to cut off the power supply of the slave to save energy, or keep it powered on to perform other data query operations.

[0047] This embodiment uses a low-speed, high-torque micro permanent magnet DC motor to directly drive the motor valve seal (piston), thereby eliminating the mechanical reduction mechanism, simplifying the structure, and improving the long-term operational reliability of the motor valve. A built-in motor control circuit is incorporated, and the on / off valve control parameters are fixed. The gas meter controls the on / off valve via communication commands. The gas meter control circuit and control method are simplified, unified, and universal, effectively improving the reliability of the on / off valve control.

[0048] The motor valve control parameters (including valve opening and closing time, valve opening and closing current, etc.) and working status information (valve opening and closing status, number of valve openings and closings, device ID, etc.) are stored internally for easy management and application of gas meters. The control parameters are designed according to the working voltage DC (2.5~6)V and the working temperature (-20~60)℃, making the design highly adaptable to the gas meter's operating conditions and environmental conditions.

[0049] As previously described, this embodiment employs a low-speed, high-torque micro permanent magnet DC motor. Under constant power conditions, this motor increases output torque by reducing its speed and utilizes silent brushes. However, its inherently high voltage drop leads to a decrease in locked-rotor torque and locked-rotor current. To overcome this problem, this design first optimizes the magnetic circuit: 1) high remanence permanent magnet materials are selected to ensure a remanence of no less than 0.4T at room temperature; 2) the thickness of the permanent magnet is appropriately increased to enhance the magnetic field strength; 3) a parallel magnetization method is adopted to make the air gap magnetic flux density distribution more uniform, thereby increasing the peak torque by 8% to 12%. Secondly, the locked-rotor torque is further improved by increasing the wire diameter and reducing the wire resistance. To address the potential increase in locked-rotor current caused by the increased wire diameter, the number of winding turns is increased to suppress it, ensuring that the locked-rotor current is strictly controlled below 220mA. The above adjustments to wire diameter and number of turns are iteratively optimized under the constraint of a slot fill factor below 75%, ultimately achieving a locked-rotor torque higher than 8.2 N·mm while meeting all electrical and space limitations. Through the coordinated optimization of the above magnetic circuit and circuit parameters, the motor achieves low-speed, high-torque output under the conditions of rated speed below 600 rpm and rated operating current less than 80mA. This achieves the goal of eliminating the mechanical reduction mechanism and directly driving the valve seals with the motor, simplifying the overall structure and improving the long-term operational reliability of the motor valve.

[0050] In an optional embodiment of the present invention, the operating conditions and requirements of the permanent magnet DC motor are as follows: operating voltage V 工作 =3V, operating current I 工作 ≤80mA, stall torque T st ≥8.2 N·mm, locked rotor current I st ≤220mA, motor radius ≤30mm.

[0051] Optimization design measures: 1. Reduce speed: The motor speed is adjusted by controlling the motor current and voltage through an integrated circuit based on parameters such as the time required for valve opening and closing, the displacement distance of the valve tip, and the lead of the thread on the motor shaft.

[0052] II. Increasing Torque: Motor torque is mainly related to two aspects: electrical load and magnetic load.

[0053] 1. Electrical load aspect Depend on It can be seen that, at a constant rotational speed, increasing power can increase torque. From...

[0054] Increasing the current while keeping the voltage constant increases the power. Therefore, in the initial design phase, we continuously increased the operating current to increase the operating torque until the requirements were met. However, this increase in current also caused the stall current to exceed 220mA, which did not meet the usage requirements. Based on this, we began designing to reduce the stall current. It is known that increasing the resistance while keeping the voltage constant reduces the current. Therefore, the stall current can be reduced by increasing the resistance of the coil. It is known that the longer the wire, the greater the resistance. Increasing the number of coil turns increases the wire length, thus increasing the resistance and reducing the stall current. However, increasing the number of coil turns increases the slot fill factor (fslot) of the rotor. When the number of coil turns reaches the upper limit of slot fill factor (75%), the stall current is still greater than 220mA, which does not meet the usage requirements. The slot fill factor (fslot) is related not only to the number of coil turns but also to the wire diameter. With the slot fill factor unchanged, reducing the wire diameter can increase the number of coil turns. At the same time, reducing the wire diameter also reduces the cross-sectional area (S) of the wire, which can also increase the resistance of the coil and further reduce the stall current. However, reducing the wire diameter will also lead to a decrease in stall torque and increase the difficulty of winding. Therefore, the wire diameter cannot be reduced excessively. So, the final solution is to balance the wire diameter and the number of turns to simultaneously satisfy the requirements of slot fill factor (fslot) < 75%, stall current < 220mA, and stall torque > 8.2 N·mm.

[0055] 2. Magnetic load aspect Increase remanence: Select a suitable permanent magnet material to ensure that the remanence is not less than 0.4T at room temperature. Increase magnetic field strength: Increase the thickness of the permanent magnet. Choosing the appropriate magnetization direction: Axial magnetization can generate higher air gap magnetic flux density in the central region of the magnetic pole, with a peak torque that is 8-12% higher.

[0056] By combining the above design optimization schemes with Motor-CAD analysis, the goal of reducing speed and increasing torque was ultimately achieved.

[0057] The electronic motor valve has a built-in electronic circuit to control the drive motor and communicates with the gas meter using TTL level. The motor valve has fixed on / off control parameters to ensure reliable valve operation under low voltage and low temperature conditions. The gas meter controls the valve by sending data commands and obtains the operating status parameters of the motor valve. The valve's on / off state is digital information, reducing the need for mechanical on / off signals. This simplifies the design of the gas meter's control circuit and control method, making it highly applicable and versatile, and reducing the risk of unreliable valve control due to different design schemes.

[0058] The operating status parameters of the motor valve are stored long-term, facilitating the information management and traceability of the gas meter. Each motor valve has a unique ID, enhancing the reliability of communication between the gas meter and the motor valve, preventing accidental valve operation, and effectively preventing unauthorized gas theft. Through these measures, the application and control of the motor valve are made more reliable and applicable.

[0059] As the service life of the motor valve increases, the valve seals (slipper heads) may wear or age, causing changes in the required stroke or resistance for valve switching. The MCU main control chip in this embodiment of the invention can also establish a trend of valve status changes by recording the peak current, time to stall, and total running time for each valve switching operation. When it detects that the running time of consecutive valve switching operations is gradually increasing, the maximum allowable valve switching time is automatically increased; when it detects that the peak current is gradually decreasing (potentially indicating seal leakage), a warning message is reported via the communication line. This adaptive mechanism ensures that the valve maintains reliable switching performance throughout its entire lifespan.

[0060] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A motor valve control system based on a logic-driven control chipset, characterized in that, include: The motor valve body, permanent magnet DC motor, control chipset and four-wire connection terminal are provided. The permanent magnet DC motor and control chipset are disposed in the motor valve body. The control chipset includes MCU main control chip, current detection circuit and motor drive chip. The MCU main control chip is used to receive control commands from an external main control system via a communication line, control the motor drive chip to drive the permanent magnet DC motor to operate according to the control commands, and return valve status and working data to the external main control board via the communication line; the current detection circuit is connected to the MCU main control chip and is used to collect the working current of the permanent magnet DC motor in real time and feed it back to the MCU main control chip. The four-wire connection terminal includes two power lines and two communication lines, used to connect to an external main control system to achieve power supply and data communication.

2. The motor valve control system according to claim 1, characterized in that, The MCU main control chip is used to compare the motor current with the preset current threshold. When the current exceeds the threshold and continues for a certain period of time, it is determined that the valve has reached the limit position. At this time, the MCU main control chip issues a stop command to cut off the motor drive output and stop the motor. At the same time, the MCU main control chip records the current position state of the valve for subsequent status query.

3. The motor valve control system according to claim 2, characterized in that, The permanent magnet DC motor is a low-speed, high-torque micro permanent magnet DC motor. The technical parameters of the low-speed, high-torque micro permanent magnet DC motor are as follows: operating voltage 2.5V~6V, operating current ≤80mA, stall torque ≥8.2N·mm, stall current ≤220mA, motor radius ≤30mm, and rated speed less than 600rpm.

4. The motor valve control system according to claim 1, characterized in that, The low-speed, high-torque micro permanent magnet DC motor uses permanent magnet materials with a residual magnetism of not less than 0.4T at room temperature. The magnetic field strength is enhanced by increasing the thickness of the permanent magnet, and the wire diameter of the winding is reduced while the number of turns is increased to increase the resistance and reduce the stall current. At the same time, the torque loss caused by the reduction in wire diameter is compensated by increasing the number of turns.

5. The motor valve control system according to claim 1, characterized in that, The MCU main control chip communicates with the external main control system at TTL level through the two communication lines, following a custom serial communication protocol. It receives valve switching commands, parameter configuration commands, and data query commands, and feeds back valve status information, cumulative number of switching times, and device ID information.

6. The motor valve control system according to claim 1, characterized in that, The MCU main control chip includes: The instruction parsing module is used to receive and parse control instructions from the external main control system and verify the legality of the instructions; The motor control module is used to output control signals to the motor drive chip, so that the permanent magnet DC motor can rotate forward or reverse to realize the valve opening or closing action; The current monitoring module is used to collect the motor current value in real time through the current detection circuit; The position determination module is used to compare the collected motor current value with the preset current threshold. When the current exceeds the threshold and continues for a set time, it determines that the valve has reached the fully open or fully closed position and controls the motor drive chip to stop outputting so that the motor stops rotating. The status recording module is used to record the current position status of the valve to a non-volatile memory.

7. The motor valve control system according to any one of claims 1 to 6, characterized in that, The motor valve body includes a motor valve housing and a pull rod assembly disposed within the motor valve housing; The pull rod assembly is connected to the permanent magnet DC motor and is also connected to the motor valve seal; the permanent magnet DC motor directly drives the motor valve seal without the need for a mechanical reduction mechanism.

8. The motor valve control system according to claim 7, characterized in that, The motor valve body also includes a motor valve rear cover adapted to the motor valve housing.

9. The motor valve control system according to claim 7, characterized in that, The motor valve rear cover is provided with a lead wire outlet, and a lead wire sealing sleeve and a lead wire seal are provided at the lead wire outlet.

10. The motor valve control system according to claim 7, characterized in that, The motor shaft of the permanent magnet DC motor is connected to the tie rod assembly via threads, and a motor shaft sealing ring is also provided on the motor shaft.

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