CN112379119A - High-robustness magnetoelectric rotation speed sensor demodulation device and method - Google Patents
High-robustness magnetoelectric rotation speed sensor demodulation device and method Download PDFInfo
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- CN112379119A CN112379119A CN202011418694.2A CN202011418694A CN112379119A CN 112379119 A CN112379119 A CN 112379119A CN 202011418694 A CN202011418694 A CN 202011418694A CN 112379119 A CN112379119 A CN 112379119A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/489—Digital circuits therefor
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Abstract
The application belongs to the technical field of detecting the rotating speed of aero-engines and gas turbines, and particularly relates to a high-robustness magnetoelectric rotating speed sensor demodulating device and method, which comprise the following steps: the interference suppression module is used for filtering the signals of the magnetoelectric revolution speed sensor; the peak detection and threshold setting module is used for carrying out peak detection and selecting high threshold voltage and low threshold voltage; a high threshold voltage comparison module for comparing the signal with a high threshold voltage; the low threshold voltage comparison module is used for comparing the signal with the low threshold voltage; and the logic trigger module is used for processing the output signals of the high and low threshold voltage comparison modules to obtain frequency signals and outputting the frequency signals to the frequency acquisition and calculation circuit. The high-robustness magnetoelectric revolution speed transducer demodulating device and the method can effectively eliminate the influence of interference voltage increase caused by the rise of revolution speed; in addition, the interference signals smaller than the difference value of the high and low threshold voltages can be effectively filtered.
Description
Technical Field
The application belongs to the technical field of detecting the rotating speed of aero-engines and gas turbines, and particularly relates to a high-robustness demodulation device and method for a magnetoelectric rotating speed sensor.
Background
The rotating speeds of the aero-engine and the gas turbine are important control parameters, and the requirements on the acquisition precision and the reliability of the rotating speeds are high. At present, most of the rotating speeds of aeroengines and gas turbines in China adopt magnetoelectric rotating speed sensors, corresponding magnetoelectric rotating speed sensor demodulation circuits demodulate the rotating speed sensors in control to form frequency signals, and a controller acquires the demodulated signal frequency and calculates the rotating speed of the engine.
The magnetoelectric rotation speed sensor is arranged near the gear, and the gear has certain magnetism. When the aircraft engine or the gas turbine runs, the gear rotates along with the aircraft engine or the gas turbine; when the protruding teeth of the gear approach the sensor, the magnetic flux of the sensor coil increases and the voltage induced by the sensor increases; when the protruding teeth of the gear leave the sensor, the magnetic flux of the sensor coil decreases and the voltage induced by the sensor decreases; therefore, the induced voltage of the sensor is a signal similar to a sine wave, the waveform has certain deformation and interference due to different shapes of teeth on the gear, influence of other teeth on the gear, vibration factors and the like, and the amplitude of the signal is influenced by the distance between the gear and the sensor, the rotating speed of the gear, the magnetism of the gear and the like.
The existing sensor demodulation method is to set a threshold voltage, and when the sensor induction voltage is higher than the threshold voltage, high voltage is output; when the sensor induction voltage is lower than the threshold voltage, outputting a low voltage; the signal demodulated by the magnetoelectric rotating speed sensor is a square wave, namely a frequency signal, generated along with the rotation of the gear, and then the controller collects the frequency of the square wave signals and calculates the rotating speed of the engine.
However, in the conventional sensor demodulation method, the signal may be disturbed to some extent due to vibration of the gear, influence of other teeth, and the like. When the signal voltage of the sensor is near the threshold voltage, if interference signals are superposed, the signal is higher than the threshold voltage for a moment and lower than the threshold voltage for a moment, so that a plurality of short-time square wave signals appear, and the excessive short-time square wave signals are considered as normal signals and are recorded into the signal frequency when collected by a rear controller, so that the rotating speed measurement collected by the engine is influenced.
In addition, the sensor's interference signal typically occurs near zero voltage, and such interference is typically not present. However, since the signal voltage sensed by the sensor increases with the increase of the rotating speed, the interference voltage of the signal also increases with the increase of the rotating speed. If the threshold voltage is set to be lower, the situation that the interference signal is higher than the threshold voltage possibly occurs under a certain condition, so that the rotating speed test is interfered; if the threshold voltage is increased, the sensor sensing voltage is lower when the rotating speed is lower, and if the rotating speed is lower than the threshold, a high-voltage signal is not generated and a frequency signal, namely a rotating speed signal, is not acquired all the time.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present application provides a demodulation apparatus and method for a high robustness magnetoelectric tachometric transducer.
In a first aspect, the present application discloses a high robustness magnetoelectric tachometric transducer demodulating equipment, includes:
the interference suppression module is used for filtering the signal detected by the magnetoelectric revolution speed sensor;
the peak detection and threshold setting module is used for carrying out peak detection on the signal filtered by the interference suppression module and selecting preset high threshold voltage and low threshold voltage;
the high threshold voltage comparison module is used for comparing the signal filtered by the interference suppression module with a high threshold voltage to generate a high threshold voltage comparison module output signal;
the low threshold voltage comparison module is used for comparing the signal filtered by the interference suppression module with a low threshold voltage so as to generate a low threshold voltage comparison module output signal;
and the logic trigger module is used for processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module to obtain a frequency signal and outputting the frequency signal to the frequency acquisition and calculation circuit.
According to at least one embodiment of the present application, the demodulation apparatus for a high robustness magnetoelectric tachometer further includes:
and the threshold voltage comparison module is used for processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module, wherein when the difference value of the high threshold voltage minus the low threshold voltage is lower than a preset difference threshold voltage, the output signal is forcibly lowered.
According to at least one embodiment of the present application, in the peak detection and threshold setting module, after peak detection is performed on a signal, a suitable discharge time constant is selected in the peak detection, so that the peak signal can be close to the envelope of the sensor signal within the whole designed rotation speed range, an upper peak voltage and a lower peak voltage of the signal at the time are detected, and then the high threshold voltage and the low threshold voltage are selected with respect to the upper peak voltage and the lower peak voltage.
In a second aspect, the present application further discloses a demodulation method for a high robustness magnetoelectric rotation speed sensor, which includes the following steps:
interference suppression step: filtering a signal detected by the magnetoelectric rotating speed sensor by adopting an interference suppression module;
peak detection and threshold setting: performing peak detection on the signal filtered by the interference suppression module by adopting a peak detection and threshold setting module, and selecting a preset high threshold voltage and a preset low threshold voltage;
a high threshold voltage comparison step: comparing the signal filtered by the interference suppression module with a high threshold voltage by using a high threshold voltage comparison module to generate a high threshold voltage comparison module output signal;
a low threshold voltage comparison step: comparing the signal filtered by the interference suppression module with a low threshold voltage by using a low threshold voltage comparison module to generate a low threshold voltage comparison module output signal;
a logic triggering step: and processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module by adopting a logic trigger module to obtain a frequency signal, and outputting the frequency signal to a frequency acquisition and calculation circuit.
According to at least one embodiment of the present application, the demodulation method of the high-robustness magnetoelectric tachometer further includes:
a threshold voltage comparison step: and processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module by adopting a threshold voltage comparison module, wherein when the difference value of the high threshold voltage minus the low threshold voltage is lower than a preset difference threshold voltage, the output signal is forcibly set to be low.
According to at least one embodiment of the present application, in the peak detection and threshold setting step:
the method comprises the steps of firstly carrying out peak detection on a signal, selecting a proper discharge time constant in the peak detection, enabling the peak signal to be close to the envelope of a sensor signal in the whole designed rotating speed range, detecting the upper peak voltage and the lower peak voltage of the signal at the moment, and finally selecting the high threshold voltage and the low threshold voltage relative to the upper peak voltage and the lower peak voltage.
The application has at least the following beneficial technical effects:
according to the high-robustness magnetoelectric rotation speed sensor demodulating device and method, due to the fact that the threshold voltage adopts a relative voltage method, the influence of interference voltage increase caused by rotation speed increase can be effectively eliminated; in addition, the mode of respectively comparing the high threshold voltage and the low threshold voltage and carrying out logic triggering is adopted, so that interference signals smaller than the difference value of the high threshold voltage and the low threshold voltage can be effectively filtered.
Drawings
FIG. 1 is a structural frame diagram of a demodulation device of a high robustness magnetoelectric tachometer sensor according to the present application;
FIG. 2 is a schematic diagram of a peak detection and threshold setting module of the high robustness magnetoelectric tachometer demodulation apparatus and method according to the present application;
FIG. 3 is a schematic diagram of an output signal of a high threshold voltage comparison module, an output signal of a low threshold voltage comparison module, and an output signal of a logic trigger module in the high robustness magnetoelectric tachometer demodulation apparatus and method according to the present application;
fig. 4 is a schematic diagram of a reference circuit of the demodulation apparatus of the high robustness magnetoelectric tachometer sensor of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The demodulation apparatus and method for a high robustness magnetoelectric tachometer according to the present application will be described in further detail with reference to fig. 1 to 4.
In a first aspect, the application discloses a high-robustness magnetoelectric tachometric transducer demodulation device, which may include an interference suppression module 1, a peak detection and threshold setting module 2, a high threshold voltage comparison module 3, a low threshold voltage comparison module 4, a threshold voltage comparison module 5, and a logic trigger module 6, and a relative voltage threshold mode is adopted to solve the problem of signal interference;
specifically, firstly, the interference suppression module 1 is adopted to filter the signal detected by the magnetoelectric rotation speed sensor so as to reduce the interference amplitude in the sensor signal.
Then, the peak detection and threshold setting module 2 is used for carrying out peak detection on the signal filtered by the interference suppression module 1 and selecting preset high threshold voltage and low threshold voltage; further, as shown in fig. 2, the peak detection is performed on the signal, and an appropriate discharge time constant is selected in the peak detection, so that the peak signal can be relatively and appropriately close to the envelope of the sensor signal within the whole design transition range, and the "upper peak voltage" and the "lower peak voltage" of the signal are detected; after peak detection, the appropriate high threshold voltage and low threshold voltage are selected relative to the upper peak voltage and the lower peak voltage.
Further, a high threshold voltage comparison module 3 is adopted to compare the signal filtered by the interference suppression module 1 with the high threshold voltage to generate an output signal of the high threshold voltage comparison module; and comparing the signal filtered by the interference suppression module 1 with the low threshold voltage by using the low threshold voltage comparison module 4 to generate a low threshold voltage comparison module output signal.
Further, the logic trigger module 6 is adopted to process the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module, and the processed output signal of the logic trigger module is a frequency signal which is output to a frequency acquisition and calculation circuit (namely a controller). The "high threshold voltage comparison module output signal", "low threshold voltage comparison module output signal" and "logic trigger module output signal" are shown in fig. 3.
Further, when the rotation speed of the sensor is low, the signal amplitude is too small, and the high threshold voltage and the low threshold voltage may be too close to each other, or even the low threshold voltage is higher than the high threshold voltage; therefore, in order to avoid the uncertain signal generated to the output signal under such a condition, the high-robustness magnetoelectric tachometric sensor demodulation device of the present application may further include a threshold voltage comparison module 5.
Specifically, the threshold voltage comparison module 5 is used for processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module, wherein when the difference value of subtracting the low threshold voltage from the high threshold voltage is lower than the preset difference threshold voltage, the output signal is forced to be low, no frequency signal is generated at the moment, and the controller cannot acquire the rotating speed signal.
In a second aspect, the present application further discloses a demodulation method for a high robustness magnetoelectric rotation speed sensor, which includes the following steps:
interference suppression step: and filtering the signal detected by the magnetoelectric revolution speed sensor by adopting an interference suppression module 1.
Peak detection and threshold setting: performing peak detection on the signal filtered by the interference suppression module 1 by adopting a peak detection and threshold setting module 2, and selecting preset 'high threshold voltage' and 'low threshold voltage'; in the peak detection and threshold setting step, corresponding to the demodulation apparatus of the first aspect, the signal is subjected to peak detection, and then an appropriate discharge time constant is selected in the peak detection, so that the peak signal can be close to the envelope of the sensor signal in the whole designed rotation speed range, and the "upper peak voltage" and the "lower peak voltage" of the signal at that time are detected, and finally, the "upper threshold voltage" and the "lower threshold voltage" are selected relative to the "upper peak voltage" and the "lower peak voltage".
A high threshold voltage comparison step: the high threshold voltage comparison module 3 is used for comparing the signal filtered by the interference suppression module 1 with the high threshold voltage to generate a high threshold voltage comparison module output signal.
A low threshold voltage comparison step: and comparing the signal filtered by the interference suppression module 1 with the low threshold voltage by using a low threshold voltage comparison module 4 to generate a low threshold voltage comparison module output signal.
A logic triggering step: and processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module by using a logic trigger module 6 to obtain a frequency signal, and outputting the frequency signal to a frequency acquisition and calculation circuit.
Further, the demodulation method of the high robustness magnetoelectric tachometric transducer of the present application may further include:
a threshold voltage comparison step: and processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module by using a threshold voltage comparison module 5, wherein when the difference value of subtracting the low threshold voltage from the high threshold voltage is lower than a preset difference threshold voltage, the output signal is forcibly set to be low, no frequency signal is generated at the moment, and the controller cannot acquire a rotating speed signal.
In addition, in the demodulation device and method for the high-robustness magnetoelectric tachometric transducer, the reference circuit principle is shown in fig. 4. In fig. 4, the "high threshold voltage" and the "low threshold voltage" can be changed by changing the resistances of the four resistors R3, R4, R5, and R6; when the resistors with the same resistance are selected for R7, R8, R9 and R10, the difference threshold voltage can be changed by changing the resistance of R11 and R12.
In summary, according to the demodulation apparatus and method for the high robustness magnetoelectric rotation speed sensor, because the threshold voltage adopts the relative voltage method, the influence of the increase of the interference voltage caused by the increase of the rotation speed can be effectively eliminated; in addition, the mode of respectively comparing the high threshold voltage and the low threshold voltage and carrying out logic triggering is adopted, so that interference signals smaller than the difference value of the high threshold voltage and the low threshold voltage can be effectively filtered.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A high robustness magnetoelectric tachometric transducer demodulating equipment which characterized in that includes:
the interference suppression module (1) is used for filtering signals detected by the magnetoelectric rotating speed sensor;
the peak detection and threshold setting module (2) is used for carrying out peak detection on the signal filtered by the interference suppression module (1) and selecting preset high threshold voltage and low threshold voltage;
the high threshold voltage comparison module (3) is used for comparing the signal filtered by the interference suppression module (1) with a high threshold voltage to generate a high threshold voltage comparison module output signal;
the low threshold voltage comparison module (4) is used for comparing the signal filtered by the interference suppression module (1) with a low threshold voltage to generate a low threshold voltage comparison module output signal;
and the logic trigger module (6) is used for processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module to obtain a frequency signal and outputting the frequency signal to the frequency acquisition and calculation circuit.
2. The high robustness magnetoelectric tachometer sensor demodulation apparatus of claim 1, further comprising:
and the threshold voltage comparison module (5) is used for processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module, wherein when the difference value of subtracting the low threshold voltage from the high threshold voltage is lower than a preset difference threshold voltage, the output signal is forced to be low.
3. The demodulation apparatus of claim 1, wherein the peak detection and threshold setting module (2) is configured to select a proper discharge time constant in peak detection after peak detection of the peak signal, so that the peak signal can be close to the envelope of the sensor signal in the entire designed rotation speed range, detect the upper peak voltage and the lower peak voltage of the signal at the time, and select the high threshold voltage and the low threshold voltage with respect to the upper peak voltage and the lower peak voltage.
4. A demodulation method of a high-robustness magnetoelectric revolution speed transducer is characterized by comprising the following steps:
interference suppression step: filtering a signal detected by a magnetoelectric rotating speed sensor by adopting an interference suppression module (1);
peak detection and threshold setting: performing peak detection on the signal filtered by the interference suppression module (1) by adopting a peak detection and threshold setting module (2), and selecting a preset high threshold voltage and a preset low threshold voltage;
a high threshold voltage comparison step: comparing the signal filtered by the interference suppression module (1) with a high threshold voltage by using a high threshold voltage comparison module (3) to generate a high threshold voltage comparison module output signal;
a low threshold voltage comparison step: comparing the signal filtered by the interference suppression module (1) with a low threshold voltage by using a low threshold voltage comparison module (4) to generate a low threshold voltage comparison module output signal;
a logic triggering step: and processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module by adopting a logic trigger module (6) to obtain a frequency signal, and outputting the frequency signal to a frequency acquisition and calculation circuit.
5. The method of claim 4, further comprising:
a threshold voltage comparison step: and processing the output signal of the high threshold voltage comparison module and the output signal of the low threshold voltage comparison module by adopting a threshold voltage comparison module (5), wherein when the difference value of the high threshold voltage minus the low threshold voltage is lower than a preset difference threshold voltage, the output signal is forcibly lowered.
6. The method of claim 4, wherein in the peak detection and threshold setting step:
the method comprises the steps of firstly carrying out peak detection on a signal, selecting a proper discharge time constant in the peak detection, enabling the peak signal to be close to the envelope of a sensor signal in the whole designed rotating speed range, detecting the upper peak voltage and the lower peak voltage of the signal at the moment, and finally selecting the high threshold voltage and the low threshold voltage relative to the upper peak voltage and the lower peak voltage.
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