Summing device for a rod displacement sensor

Abstract

The utility model discloses a kind of rod displacement sensor and value acquisition equipment, including rod displacement sensor signal input unit, whereby, by the unique differential acquisition circuit design, increase a level operational amplifier to carry out isolation in sensor signal input end, realized the reliable isolation of sensor signal and subsequent acquisition circuit, effectively suppressed common-mode interference, ensure that output signal is stable in full stroke range And not be influenced by post-circuit, can discover sensor output fault in time, significantly improve the reliability of system, using operational amplifier, resistance, capacitor and so on Common component constitutes, design is simple and efficient, not only realize the acquisition, isolation, demodulation and filter integrated processing of signal, also have multi-signal and value acquisition function, can adapt to multiple displacement sensor types and complex working conditions, with strong anti-interference ability, high measurement accuracy, wide application range and other advantages, perfectly solve the deficiency of traditional system in fault detection and signal processing.

Description

Technical Field

[0001] This utility model relates to the technical field of fly-by-wire flight control, and in particular to a device for acquiring the sum of values ​​of a stick displacement sensor. Background Technology

[0002] In fly-by-wire flight control systems, stick displacement sensors are critical sensing elements, and the accuracy and reliability of their output signals directly affect the safety and stability of the flight control system. Traditional solutions typically use a first-order differential amplifier to acquire the sum of stick displacement signals to monitor the validity of the sensor output signals. However, this traditional approach has significant technical drawbacks: For example, when a differential amplifier directly acquires sensor signals, it is susceptible to common-mode interference, leading to output signal fluctuations and affecting the judgment accuracy of the control system. Furthermore, when a disconnection fault occurs in the output signal at any end of the rod displacement sensor, the corresponding input terminal of the differential amplifier is open-circuited, resulting in unstable input voltage. Because traditional circuits lack effective isolation and signal conditioning mechanisms, they cannot reliably detect such faults across the entire stroke range, potentially causing misjudgments or failures in the control system, posing safety hazards. Summary of the Invention

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, the purpose of this utility model is to propose a value acquisition device for a rod displacement sensor, which can enhance anti-interference capability while ensuring high-precision signal acquisition, and has fault detection function within the entire stroke range, so as to meet the stringent requirements of avionics systems for reliability and safety.

[0005] To achieve the above objectives, this utility model proposes a rod displacement sensor sum value acquisition device, including a rod displacement sensor signal input unit, a differential acquisition circuit unit, a conditioning circuit unit, and a filtering circuit unit. The output terminal of the rod displacement sensor signal input unit is connected to the input terminal of the differential acquisition circuit; the output terminal of the differential acquisition circuit is connected to the input terminal of the conditioning circuit unit; and the output terminal of the conditioning circuit is connected to the input terminal of the filtering circuit unit.

[0006] In addition, the rod displacement sensor sum value acquisition device proposed in the above application may also have the following additional technical features: Specifically, the differential acquisition circuit unit isolates the sensor of the rod displacement sensor signal input unit from the differential amplifier of the differential acquisition circuit by adding an operational amplifier stage.

[0007] Specifically, the conditioning circuit unit is used to demodulate the sensor AC signal acquired by the differential acquisition circuit unit into a DC signal.

[0008] Specifically, the filtering circuit unit is used to filter the voltage signal.

[0009] Specifically, the conditioning circuit unit consists of an operational amplifier with a gain of several diodes and resistors, and the filtering circuit unit consists of an operational amplifier with several resistors and capacitors.

[0010] Specifically, it also includes a digital processing unit, the output of which is connected to the output of the filter circuit unit.

[0011] Specifically, the digital processing unit includes an analog-to-digital converter and a microcontroller.

[0012] This utility model's rod displacement sensor sum value acquisition device, through a unique differential acquisition circuit design, adds an operational amplifier stage at the sensor signal input end for isolation, achieving reliable isolation between the sensor signal and subsequent acquisition circuits. This effectively suppresses common-mode interference, ensuring stable output signal across the entire stroke range and unaffected by subsequent circuits. It can promptly detect sensor output faults, significantly improving system reliability. Constructed using common components such as operational amplifiers, resistors, and capacitors, the design is simple and efficient. It not only achieves integrated signal acquisition, isolation, demodulation, and filtering but also features multi-signal sum value acquisition capabilities. It can adapt to various displacement sensor types and complex working conditions, possessing advantages such as strong anti-interference ability, high measurement accuracy, and wide applicability. It perfectly solves the shortcomings of traditional systems in fault detection and signal processing.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of a rod displacement sensor sum value acquisition device according to an embodiment of the present invention. Detailed Implementation

[0015] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0016] The following description, in conjunction with the accompanying drawings, describes the rod displacement sensor and its value acquisition device according to an embodiment of the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of a rod displacement sensor and value acquisition device according to an embodiment of the present invention.

[0018] like Figure 1 As shown, the rod displacement sensor sum value acquisition device of this utility model embodiment includes a rod displacement sensor signal input unit, a differential acquisition circuit unit, a conditioning circuit unit, and a filtering circuit unit. The output terminal of the rod displacement sensor signal input unit is connected to the input terminal of the differential acquisition circuit; the output terminal of the differential acquisition circuit is connected to the input terminal of the conditioning circuit unit; and the output terminal of the conditioning circuit is connected to the input terminal of the filtering circuit unit.

[0019] This embodiment consists of a single operational amplifier with four independent, high-gain, and internally compensated components, along with several resistors. The output signals of the rod displacement sensor are S1, S2, and S3, respectively, connected to input terminals 2 of operational amplifiers U1, U2, and U3. Input terminals 1 of resistors R2, R4, and R6 are simultaneously grounded, and input terminals 2 of resistors R2, R4, and R6 are connected to input terminals 2 of operational amplifiers U1, U2, and U3, respectively. Input terminals 1 of resistors R1, R3, and R5 are connected to input terminals 1 of operational amplifiers U1, U2, and U3, respectively, and input terminals 2 of resistors R1, R3, and R5 are connected to output terminals 3 of operational amplifiers U1, U2, and U3, respectively, and are also connected to input terminals 1 of resistors R7, R8, and R9, respectively. Input terminal 2 of resistor R7 is connected to resistor R1... Input 1 of resistor R1 is simultaneously connected to input 1 of operational amplifier U4. Input 2 of resistors R8 and R9, and input 1 of resistor R10 are simultaneously connected to input 2 of operational amplifier U4. Input 2 of resistor R10 is grounded. Input 2 of resistor R11 is connected to output 3 of operational amplifier U4. Output 3 of operational amplifier U4 serves as the final output signal Vout1. Circuit implementation parameters: R1=R2=R3=R4=R5=R6; R7=R8=R9=R10=R11. The differential acquisition circuit enables fault detection throughout the entire stroke range of the rod displacement sensor and provides signal acquisition functionality applicable to various displacement signals.

[0020] In one embodiment of this utility model, such as Figure 1 As shown, the differential acquisition circuit unit isolates the sensor of the rod displacement sensor signal input unit from the differential amplifier of the differential acquisition circuit by adding an operational amplifier stage.

[0021] In one embodiment of this utility model, such as Figure 1As shown, the conditioning circuit unit is used to demodulate the sensor AC signal acquired by the differential acquisition circuit unit into a DC signal.

[0022] The output signal Vout1 of the differential acquisition circuit unit is connected to input terminal 1 of resistor R12. Input terminal 2 of resistor R12 is simultaneously connected to input terminal 1 of resistor R14, input terminal 1 of diode D1, and input terminal 1 of operational amplifier U4. Input terminal 1 of resistor R13 is grounded, and input terminal 2 of resistor R13 is connected to input terminal 2 of operational amplifier U4. Output terminal 2 of diode D1 and input terminal 1 of diode D2 are simultaneously connected to output terminal 3 of operational amplifier U4. Input terminal 2 of resistor R14 is connected to output terminal 2 of diode D2 as the final output signal Vout2. Circuit implementation parameters: R12=R13=R14.

[0023] In one embodiment of this utility model, such as Figure 1 As shown, the filter circuit unit is used to filter the voltage signal.

[0024] In one embodiment of this utility model, such as Figure 1 As shown, the conditioning circuit unit consists of an operational amplifier with a certain gain, several diodes, and resistors, and the filtering circuit unit consists of an operational amplifier, several resistors, and capacitors.

[0025] The output signal Vout2 of the conditioning circuit unit is connected to input 1 of resistor R16. Input 2 of resistor R16 and input 1 of capacitor C1 are simultaneously connected to input 2 of operational amplifier U5. Input 2 of capacitor C1 and input 1 of resistor R15 are simultaneously grounded. Input 2 of resistor R15 is simultaneously connected to input 1 of resistor R17 and input 1 of operational amplifier U5. Input 2 of resistor R17 and input 1 of resistor R18 are simultaneously connected to output 3 of operational amplifier U5. Input 2 of resistor R18 serves as the final output signal Vout3. Circuit implementation parameters: R15=R16=R17=R18. The DC analog signal is low-pass filtered by the filtering circuit unit and then used as the final output of the sum acquisition system of the rod displacement sensor.

[0026] When the output signal of any end of the rod displacement sensor fails, the differential acquisition circuit outputs a stable signal, enabling fault detection throughout the entire stroke range of the rod displacement sensor and the acquisition of sum signals applicable to various displacement signals.

[0027] The rod displacement and value signal conditioning circuit is implemented by a non-phase sensitive demodulation circuit. The single-ended signal obtained by the acquisition circuit uses the unidirectional conduction characteristic of the diode to select the positive or negative half-wave signal of the input sine wave signal; and after half-wave rectification, the DC analog signal after rod displacement and value signal conversion is obtained.

[0028] The DC analog signal converted from the rod displacement sum signal is output after passing through an active first-order low-pass filter circuit. This output serves as the final output of the rod displacement sensor sum acquisition system, with the output voltage being: Solving for: .

[0029] In one embodiment of this utility model, such as Figure 1 As shown, it also includes a digital processing unit, the output of which is connected to the output of the filter circuit unit.

[0030] In one embodiment of this utility model, such as Figure 1 As shown, the digital processing unit includes an analog-to-digital converter and a microcontroller.

[0031] The microcontroller has a preset normal signal range threshold for real-time comparison of the acquired digital signals. When the signal value exceeds the threshold range, a digital fault flag signal is output. The microcontroller is configured to perform signal consistency verification by simultaneously analyzing the differential signal before conditioning and the DC signal after conditioning and filtering. If the logic relationship is abnormal, a sensor or conditioning circuit fault warning signal is output.

[0032] By comparing signals with preset thresholds in real time, the system can provide millisecond-level accurate alarms for faults such as sensor disconnection and short circuit, completely solving the problem that traditional systems cannot reliably detect faults throughout the entire travel range.

[0033] In summary, the rod displacement sensor sum acquisition device of this utility model embodiment, through a unique differential acquisition circuit design, adds an operational amplifier stage at the sensor signal input end for isolation, achieving reliable isolation between the sensor signal and subsequent acquisition circuits, effectively suppressing common-mode interference, ensuring stable output signal throughout the entire stroke range and unaffected by subsequent circuits, enabling timely detection of sensor output faults, and significantly improving system reliability. Constructed using common components such as operational amplifiers, resistors, and capacitors, the design is simple and efficient, not only achieving integrated signal acquisition, isolation, demodulation, and filtering, but also possessing multi-signal sum acquisition capabilities. It can adapt to various displacement sensor types and complex working conditions, and has advantages such as strong anti-interference ability, high measurement accuracy, and wide applicability, perfectly solving the shortcomings of traditional systems in fault detection and signal processing.

[0034] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for acquiring the sum of values ​​from a rod displacement sensor, characterized in that, It includes a rod displacement sensor signal input unit, a differential acquisition circuit unit, a conditioning circuit unit, and a filtering circuit unit, among which, The output terminal of the rod displacement sensor signal input unit is connected to the input terminal of the differential acquisition circuit; The output terminal of the differential acquisition circuit is connected to the input terminal of the conditioning circuit unit; The output of the conditioning circuit is connected to the input of the filter circuit unit.

2. The sum value acquisition device for the rod displacement sensor according to claim 1, characterized in that, The differential acquisition circuit unit isolates the sensor of the rod displacement sensor signal input unit from the differential amplifier of the differential acquisition circuit by adding an operational amplifier stage.

3. The sum value acquisition device for the rod displacement sensor according to claim 1, characterized in that, The conditioning circuit unit is used to demodulate the AC signal from the sensor acquired by the differential acquisition circuit unit into a DC signal.

4. The sum value acquisition device for the rod displacement sensor according to claim 1, characterized in that, The filtering circuit unit is used to filter the voltage signal.

5. The sum value acquisition device for the rod displacement sensor according to claim 1, characterized in that, The conditioning circuit unit consists of an operational amplifier with a certain gain, several diodes, and resistors; the filtering circuit unit consists of an operational amplifier, several resistors, and capacitors.

6. The sum value acquisition device for the rod displacement sensor according to claim 1, characterized in that, It also includes a digital processing unit, the output of which is connected to the output of the filter circuit unit.

7. The sum value acquisition device for the rod displacement sensor according to claim 6, characterized in that, The digital processing unit includes an analog-to-digital converter and a microcontroller.

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