A dual position detection circuit for an electric motor

Abstract

A kind of double position detection circuit for electric mechanism, including: drive module, logic circuit, first optocoupler, second optocoupler, position hall sensor and power conversion module.The present application uses non-contact position sensor to monitor and feedback current state of fuel on-off valve, and judges the current position by logic operation to accept instruction, generates corresponding control signal, and then controls motor positive and negative rotation, realizes the switching action of fuel on-off valve.Under the special flight demand of aircraft, through the identification of host command, the double position detection electric mechanism designed can quickly respond, and according to the requirement of instruction, the fuel on-off valve body is driven to realize the specified position by transmission mechanism, and the opening and closing of fuel on-off valve is accurately and reliably realized, the oil distribution of aircraft is further controlled, and the in-place signal is fed back to host to participate in the whole flight control system.The present application has the characteristics of high reliability, high safety, long flight time, light weight, less maintenance and the like.

Description

Technical Field

[0001] This invention relates to a dual-position detection circuit for an electric mechanism, belonging to the field of electric ball valve control for shipborne aircraft fuel systems. Background Technology

[0002] The electric motor is an important component of the fuel system of a certain shipborne aircraft. The electric mechanism receives control commands from the outside and provides power to the transfer control valve core. The stroke ranges from 0° to 90° and can provide position feedback signals, mechanical indication and mechanical limit functions.

[0003] Traditional electric mechanisms using dual-position detection circuits rely on mechanical contact microswitches to control the motor's start and stop. This can lead to situations where the contacts fail to trigger properly after prolonged use, affecting the reliable operation of the mechanism. Furthermore, the limited number of actions severely restricts the mechanism's lifespan. The electrical pulse generated at the moment of switch triggering cannot meet the requirements of the complex electromagnetic environment of airborne electronic equipment. Most dual-position detection circuits require a digital logic core, which has disadvantages such as high cost, complex control logic, software malfunctions, and poor long-term reliability. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of existing technologies and provide a dual-position detection circuit for an electric mechanism to control the fuel distribution of an aircraft and feed the position signal back to the host to participate in the entire flight control system. This circuit is suitable for the high reliability, high safety, long endurance, lightweight, and low maintenance characteristics of aviation products.

[0005] The technical solution of this invention is:

[0006] A dual-position detection circuit for an electric mechanism includes: a drive module, a logic circuit, a first optocoupler, a second optocoupler, a position Hall sensor, and a power conversion module;

[0007] The electric mechanism receives forward or reverse commands from the outside and converts the command level into a stable 5V power supply via the power conversion module to power the pull-up levels of the two optocouplers and the logic circuit.

[0008] When a forward rotation command is received,

[0009] If the current fuel on / off valve is in the correct position, the position Hall sensor outputs a high level for the positive signal and a low level for the negative signal. Both optocouplers output high, the logic circuit outputs a low enable signal to the drive module, the motor does not rotate, and the dual position detection circuit outputs a positive position signal.

[0010] If the current fuel on / off valve is not in the correct position, the position Hall sensor outputs a low level for both positive and negative signals. The first optocoupler is low and the second optocoupler is high. The logic circuit sets the enable signal to high, and the logic circuit outputs positive and negative signals to the drive module. The drive module receives the enable signal and the forward rotation signal, and drives the motor to rotate forward. After the fuel on / off valve is in the correct position, the first optocoupler is high, the drive module is not enabled, and the dual position detection circuit outputs a positive position signal.

[0011] When a reverse command is received

[0012] If the current fuel on / off valve is in the reverse position, the position Hall sensor outputs a high level for the reverse signal and a low level for the positive signal. Both optocouplers output high, the logic circuit outputs a low enable signal to the drive module, the motor does not rotate, and the dual position detection circuit outputs a reverse position signal.

[0013] If the current fuel on / off valve is not in the reverse position, the position Hall sensor outputs a low level for both positive and negative signals, the first optocoupler is at a high level, and the second optocoupler is at a low level. The logic circuit sets the enable signal to high, and the logic circuit outputs a low signal to the drive module. The drive module receives the enable signal and the reverse signal, and drives the motor to reverse. After the fuel on / off valve is in position, the second optocoupler is at a high level, the drive module is not enabled, and the dual position detection circuit outputs a reverse position signal.

[0014] Furthermore, after the electric mechanism receives and stabilizes the forward or reverse command level sent from the outside, it is used to power the dual position detection circuit and to provide a pull-up level for feedback of the position signal.

[0015] Furthermore, it also includes a first MOSFET and a second MOSFET;

[0016] The first MOSFET is used for the positive position signal output, and the second MOSFET is used for the negative position signal output. The gate of the first MOSFET is connected to the positive position signal output of the position Hall sensor, the drain is used as the signal output and pulled up to 28V, and the source is grounded. When the fuel valve is in the positive position, the positive position signal output of the position Hall sensor is high, so the first MOSFET is turned on and the signal output is low; when the fuel valve is not in the positive position, the positive position signal output of the position Hall sensor is low, so the first MOSFET is turned off and the signal output is high. The gate of the second MOSFET is connected to the negative position signal output of the position Hall sensor, the drain is used as the signal output and pulled up to 28V, and the source is grounded. When the fuel valve is in the negative position, the negative position signal output of the position Hall sensor is high, so the second MOSFET is turned on and the signal output is low; when the fuel valve is not in the negative position, the negative position signal output of the position Hall sensor is low, so the negative MOSFET is turned off and the signal output is high.

[0017] Furthermore, the logic circuit is an XOR gate, which performs logical operations based on the output signals of the first and second optocouplers as inputs to generate corresponding enable signals and forward / reverse signals, which are used to drive the control logic of the module.

[0018] Furthermore, upon receiving the forward rotation command signal, the dual-position detection circuit causes the fuel on / off valve to move from its initial position 0. 0 ±1 0 Rotate to 90 0 ±2 0 Once the correct position is reached, a positive position feedback signal is issued; upon receiving a reverse command signal, the fuel on / off valve moves from its initial position of 90 degrees. 0 ±2 0 Rotate to 0 0 ±1 0 Once the reverse position is in place, a reverse position feedback signal is sent.

[0019] Furthermore, the position Hall sensor consists of two parts: the sensor body and the magnet assembly. The position Hall sensor is used to detect the position information of the moving part relative to the fixed point during the movement of the moving part. It is a contactless zero-position sensor that uses the magnet as the trigger medium. It receives the magnetic field line signal through the Hall device, and controls the on / off state of the output state after amplification and shaping.

[0020] Furthermore, when the position Hall sensor is powered by +18V to +32V and has a 15K pull-up load resistor: when the magnet assembly is triggered, the sensor outputs a high level > pull-up voltage -0.5V; when the magnet assembly is not triggered, the sensor outputs a low level <0.5V.

[0021] Furthermore, the electric mechanism receives external control commands to power the fuel on / off valve of the shipborne aircraft fuel transfer system, with the fuel on / off valve having a stroke of 0° to 90°.

[0022] Furthermore, the electric motor is used to drive the fuel on / off valve to rotate.

[0023] The beneficial effects of this invention compared to the prior art are:

[0024] (1) This invention achieves dual position monitoring of positive and negative positions through a non-contact position Hall sensor, and achieves position control through the magnetic flux of the sensitive element. There is no mechanical contact. After the position is reached, the current position signal is fed back. The position accuracy can reach ±1°, which effectively improves the life of the electric mechanism while ensuring accuracy.

[0025] (2) The present invention adopts a controllerless electromechanical system design, which minimizes the use of electronic components and is suitable for working environments with harsh environmental and mechanical conditions and poor electromagnetic environment.

[0026] (3) The present invention uses MOS transistors for position signal processing, which can drive the back-end load while ensuring signal recognition. It can be used to drive signals and perform further operations directly based on the current fuel on / off status. Attached Figure Description

[0027] Figure 1 This is a topology diagram of the dual-position detection circuit of the present invention; Detailed Implementation

[0028] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0029] This invention relates to an electric fuel valve on / off mechanism system designed based on a Hall zero-position sensor. This system enables rapid response under special flight requirements, accurately and reliably controlling the on / off state of the fuel valve, further ensuring the safety of the aircraft and flight mission. It is of great significance to the development of lightweight and intelligent fuel systems and provides valuable insights for the research and development of fuel valve control systems and aero-engines.

[0030] like Figure 1 As shown, the present invention proposes a dual position detection circuit for an electric mechanism, comprising: a drive module, a logic circuit, a first optocoupler, a second optocoupler, a position Hall sensor, and a power conversion module;

[0031] The electric mechanism receives forward or reverse commands from the outside and converts the command level into a stable 5V power supply via the power conversion module to power the pull-up levels of the two optocouplers and the logic circuit.

[0032] When a forward rotation command is received,

[0033] If the current fuel on / off valve is in the correct position, the position Hall sensor outputs a high level for the positive signal and a low level for the negative signal. Both optocouplers output high, the logic circuit outputs a low enable signal to the drive module, the motor does not rotate, and the dual position detection circuit outputs a positive position signal.

[0034] If the current fuel on / off valve is not in the correct position, the position Hall sensor outputs a low level for both positive and negative signals. The first optocoupler is low and the second optocoupler is high. The logic circuit sets the enable signal to high, and the logic circuit outputs positive and negative signals to the drive module. The drive module receives the enable signal and the forward rotation signal, and drives the motor to rotate forward. After the fuel on / off valve is in the correct position, the first optocoupler is high, the drive module is not enabled, and the dual position detection circuit outputs a positive position signal.

[0035] When a reverse command is received

[0036] If the current fuel on / off valve is in the reverse position, the position Hall sensor outputs a high level for the reverse signal and a low level for the positive signal. Both optocouplers output high, the logic circuit outputs a low enable signal to the drive module, the motor does not rotate, and the dual position detection circuit outputs a reverse position signal.

[0037] If the current fuel on / off valve is not in the reverse position, the position Hall sensor outputs a low level for both positive and negative signals, the first optocoupler is at a high level, and the second optocoupler is at a low level. The logic circuit sets the enable signal to high, and the logic circuit outputs a low signal to the drive module. The drive module receives the enable signal and the reverse signal, and drives the motor to reverse. After the fuel on / off valve is in position, the second optocoupler is at a high level, the drive module is not enabled, and the dual position detection circuit outputs a reverse position signal.

[0038] After the electric mechanism receives the forward or reverse command from the outside and the level stabilizes, it is used to power the dual position detection circuit and to pull up the level for feedback of the position signal.

[0039] like Figure 1 As shown, the dual-position detection circuit of the present invention also includes a first MOS transistor and a second MOS transistor;

[0040] The first MOSFET is used for the positive position signal output, and the second MOSFET is used for the negative position signal output. The gate of the first MOSFET is connected to the positive position signal output of the position Hall sensor, the drain is used as the signal output and pulled up to 28V, and the source is grounded. When the fuel valve is in the positive position, the positive position signal output of the position Hall sensor is high, so the first MOSFET is turned on and the signal output is low; when the fuel valve is not in the positive position, the positive position signal output of the position Hall sensor is low, so the first MOSFET is turned off and the signal output is high. The gate of the second MOSFET is connected to the negative position signal output of the position Hall sensor, the drain is used as the signal output and pulled up to 28V, and the source is grounded. When the fuel valve is in the negative position, the negative position signal output of the position Hall sensor is high, so the second MOSFET is turned on and the signal output is low; when the fuel valve is not in the negative position, the negative position signal output of the position Hall sensor is low, so the negative MOSFET is turned off and the signal output is high.

[0041] In this invention, the logic circuit is an XOR gate. It performs logic operations based on the output signals of the first and second optocouplers as inputs to generate corresponding enable signals and forward / reverse signals, which are used to drive the control logic of the module.

[0042] When the dual-position detection circuit receives the forward rotation command signal (fuel delivery signal), the fuel on / off valve moves from its initial position 0. 0 ±1 0 Rotate to 90 0 ±2 0 Once the correct position is reached, a positive position feedback signal is issued; upon receiving a reverse command signal (fuel supply signal), the fuel on / off valve moves from its initial position 90 degrees.0 ±2 0 Rotate to 0 0 ±1 0 Once the reverse position is in place, a reverse position feedback signal is sent.

[0043] A position Hall sensor is a non-contact device for detecting position information, consisting of a sensor body and a magnet assembly. The sensor utilizes the Hall effect principle to detect the position of a moving part relative to a fixed point during movement. It is a non-contact sensor based on the Hall effect principle, using a magnet as the trigger medium. It receives magnetic field signals through a Hall device, amplifies and shapes them, and then controls the on / off state of the output. With a +18V to +32V power supply and a 15K pull-up load resistor (implemented and fed back by the sensor itself): when the magnet assembly is triggered, the sensor outputs a high level (supply voltage) > pull-up voltage -0.5V; when the magnet assembly is not triggered, the sensor outputs a low level <0.5V.

[0044] This invention employs a non-contact position sensor to monitor and provide feedback on the current state of the fuel on / off valve. Through logical operations, it judges the received command and the current position, generating corresponding control signals to control the forward and reverse rotation of the motor, thereby achieving the opening and closing of the fuel on / off valve. Under special flight requirements of aircraft, the designed dual-position detection electric mechanism can respond quickly by recognizing host commands. According to the command requirements, it drives the fuel on / off valve body to the designated position via a transmission mechanism, accurately and reliably realizing the opening and closing of the fuel on / off valve, further controlling the aircraft's fuel distribution, and feeding back the position signal to the host to participate in the entire flight control system. This design is suitable for the high reliability, high safety, long endurance, lightweight, and low maintenance characteristics of aviation products.

[0045] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A dual-position detection circuit for an electric mechanism, characterized in that... include: The system includes a driver module, logic circuits, a first optocoupler, a second optocoupler, a position Hall sensor, and a power conversion module. The electric mechanism receives forward or reverse commands from the outside and converts the command level into a stable 5V power supply via the power conversion module to power the pull-up levels of the two optocouplers and the logic circuit. When a forward rotation command is received, If the current fuel on / off valve is in the correct position, the position Hall sensor outputs a high level for the positive signal and a low level for the negative signal. Both optocouplers output high, the logic circuit outputs a low enable signal to the drive module, the motor does not rotate, and the dual position detection circuit outputs a positive position signal. If the current fuel on / off valve is not in the correct position, the position Hall sensor outputs a low level for both positive and negative signals. The first optocoupler is low and the second optocoupler is high. The logic circuit sets the enable signal to high, and the logic circuit outputs positive and negative signals to the drive module. The drive module receives the enable signal and the forward rotation signal, and drives the motor to rotate forward. After the fuel on / off valve is in the correct position, the first optocoupler is high, the drive module is not enabled, and the dual position detection circuit outputs a positive position signal. When a reverse command is received If the current fuel on / off valve is in the reverse position, the position Hall sensor outputs a high level for the reverse signal and a low level for the positive signal. Both optocouplers output high, the logic circuit outputs a low enable signal to the drive module, the motor does not rotate, and the dual position detection circuit outputs a reverse position signal. If the current fuel on / off valve is not in the reverse position, the position Hall sensor outputs a low level for both positive and negative signals, the first optocoupler is at a high level, and the second optocoupler is at a low level. The logic circuit sets the enable signal to high, and the logic circuit outputs a low signal to the drive module. The drive module receives the enable signal and the reverse signal, and drives the motor to reverse. After the fuel on / off valve is in position, the second optocoupler is at a high level, the drive module is not enabled, and the dual position detection circuit outputs a reverse position signal.

2. The dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: After the electric mechanism receives the forward or reverse command from the outside and the level stabilizes, it is used to power the dual position detection circuit and to pull up the level for feedback of the position signal.

3. The dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: It also includes the first MOSFET and the second MOSFET; The first MOSFET is used for the positive position signal output, and the second MOSFET is used for the negative position signal output. The gate of the first MOSFET is connected to the positive position signal output of the position Hall sensor, the drain is used as the signal output and pulled up to 28V, and the source is grounded. When the fuel valve is in the positive position, the positive position signal output of the position Hall sensor is high, so the first MOSFET is turned on and the signal output is low; when the fuel valve is not in the positive position, the positive position signal output of the position Hall sensor is low, so the first MOSFET is turned off and the signal output is high. The gate of the second MOSFET is connected to the negative position signal output of the position Hall sensor, the drain is used as the signal output and pulled up to 28V, and the source is grounded. When the fuel valve is in the negative position, the negative position signal output of the position Hall sensor is high, so the second MOSFET is turned on and the signal output is low; when the fuel valve is not in the negative position, the negative position signal output of the position Hall sensor is low, so the negative MOSFET is turned off and the signal output is high.

4. The dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: The logic circuit is an XOR gate. It performs logical operations based on the output signals of the first and second optocouplers as inputs to generate corresponding enable signals and forward / reverse signals, which are used to drive the control logic of the module.

5. The dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: When the dual-position detection circuit receives the forward rotation command signal, the fuel on / off valve moves from its initial position 0. 0 ±1 0 Rotate to 90 0 ±2 0 Once the correct position is reached, a positive position feedback signal is issued; upon receiving a reverse command signal, the fuel on / off valve moves from its initial position of 90 degrees. 0 ±2 0 Rotate to 0 0 ±1 0 Once the reverse position is in place, a reverse position feedback signal is sent.

6. The dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: The position Hall sensor consists of two parts: the sensor body and the magnet assembly. The position Hall sensor is used to detect the position information of the moving part relative to the fixed point during the movement of the moving part. It is a contactless zero-position sensor that uses the magnet as the trigger medium. It receives the magnetic field signal through the Hall device, and controls the on / off state of the output state after amplification and shaping.

7. A dual-position detection circuit for an electric mechanism according to claim 6, characterized in that: When the position Hall sensor is powered by +18V to +32V and has a 15K pull-up load resistor: when the magnet assembly is triggered, the sensor outputs a high level > pull-up voltage -0.5V; when the magnet assembly is not triggered, the sensor outputs a low level <0.5V.

8. The dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: The electric mechanism receives external control commands to power the fuel on / off valve of the shipborne aircraft fuel transfer system, with the fuel on / off valve having a stroke of 0° to 90°.

9. A dual-position detection circuit for an electric mechanism according to claim 1, characterized in that: The electric motor is used to drive the fuel on / off valve to rotate.

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