CN217159677U - Rotating speed acquisition circuit and rotating speed acquisition device - Google Patents
Rotating speed acquisition circuit and rotating speed acquisition device Download PDFInfo
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- CN217159677U CN217159677U CN202220315754.6U CN202220315754U CN217159677U CN 217159677 U CN217159677 U CN 217159677U CN 202220315754 U CN202220315754 U CN 202220315754U CN 217159677 U CN217159677 U CN 217159677U
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Abstract
The application discloses rotational speed acquisition circuit and rotational speed acquisition device. The rotating speed acquisition circuit comprises a rotating speed signal filtering module, a conditioning amplifying module, a frequency acquisition module and a signal processing module, wherein the conditioning amplifying module is connected with the rotating speed signal filtering module, the frequency acquisition module is connected with the conditioning amplifying module, and the signal processing module is connected with the frequency acquisition module. The signal acquisition module acquires a rotating speed signal, divides the rotating speed signal into two paths of rotating speed signals, respectively carries out low-pass filtering on the rotating speed signal to obtain two paths of filtering signals, the conditioning and amplification module conditions and amplifies the two paths of filtering signals to obtain two paths of pulse frequency signals, the frequency acquisition module converts the two paths of pulse frequency signals to obtain two paths of digital signals, and the signal processing module carries out filtering processing on the two paths of digital signals to obtain frequency data corresponding to the rotating speed signals. This application is through adopting above-mentioned rotational speed acquisition circuit, need not mark just can gather rotational speed data to rotational speed frequency, and the acquisition process is simple.
Description
Technical Field
The application relates to the technical field of electronics, especially, relate to a rotational speed acquisition circuit and rotational speed collection system.
Background
The aircraft engine rotating speed acquisition device can be matched with an GCZ-1 rotating speed magnetic sensor to acquire the rotating speed of the engine and is used for monitoring the working state of the engine, protecting over-running and the like. In the related art, a frequency-voltage conversion method is usually adopted in an engine rotation speed acquisition device for rotation speed acquisition, but the method also needs to calibrate the rotation speed frequency, and the acquisition process is complex.
SUMMERY OF THE UTILITY MODEL
The present application is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the application provides a rotating speed acquisition circuit and a rotating speed acquisition device, rotating speed data can be acquired without calibrating rotating speed frequency, and the acquisition process is simple.
In a first aspect, an embodiment of the present application provides a rotation speed acquisition circuit, including:
the rotating speed signal filtering module is used for acquiring a rotating speed signal, dividing the rotating speed signal into a first rotating speed signal and a second rotating speed signal, performing low-pass filtering processing on the first rotating speed signal to output a first filtering signal, and performing low-pass filtering processing on the second rotating speed signal to output a second filtering signal; wherein the first rotational speed signal and the second rotational speed signal are the same;
the conditioning and amplifying module is connected with the rotating speed signal filtering module, and is used for receiving the first filtering signal and the second filtering signal output by the rotating speed signal filtering module, conditioning and amplifying the first filtering signal to output a first pulse frequency signal, and conditioning and amplifying the second filtering signal to output a second pulse frequency signal;
the frequency acquisition module is connected with the conditioning amplification module, and is used for receiving the first pulse frequency signal and the second pulse frequency signal output by the conditioning amplification module, converting the first pulse frequency signal to output a first digital signal, and converting the second pulse frequency signal to output a second digital signal;
and the signal processing module is connected with the frequency acquisition module and used for receiving the first digital signal and the second digital signal output by the frequency acquisition module, filtering the first digital signal to obtain first frequency data corresponding to the first rotating speed signal, and filtering the second digital signal to obtain second frequency data corresponding to the second rotating speed signal.
The technical solution of the first aspect of the present application has at least one of the following advantages or beneficial effects: the rotating speed acquisition circuit comprises a rotating speed signal filtering module, a conditioning amplification module, a frequency acquisition module and a signal processing module, wherein the conditioning amplification module is connected with the rotating speed signal filtering module, the frequency acquisition module is connected with the conditioning amplification module, and the signal processing module is connected with the frequency acquisition module. The rotating speed signal filtering module collects a rotating speed signal, divides the rotating speed signal into a first rotating speed signal and a second rotating speed signal, and then performs low-pass filtering on the first rotating speed signal to output a first filtering signal and performs low-pass filtering on the second rotating speed signal to output a second filtering signal; wherein the first rotation speed signal and the second rotation speed signal are the same; the conditioning and amplifying module receives the first filtering signal and the second filtering signal output by the rotating speed signal filtering module, conditions and amplifies the first filtering signal to output a first pulse frequency signal, and conditions and amplifies the second filtering signal to output a second pulse frequency signal; the frequency acquisition module receives the first pulse frequency signal and the second pulse frequency signal output by the conditioning and amplifying module, converts the first pulse frequency signal to output a first digital signal, and converts the second pulse frequency signal to output a second digital signal; the signal processing module receives the first digital signal and the second digital signal output by the frequency acquisition module, and performs filtering processing on the first digital signal to obtain first frequency data corresponding to the first rotating speed signal, and performs filtering processing on the second digital signal to obtain second frequency data corresponding to the second rotating speed signal. The embodiment of the application can acquire the rotating speed data without calibrating the rotating speed frequency by designing the rotating speed acquisition circuit, and the acquisition process is simple.
In some embodiments of the present application, the rotation speed signal filtering module includes a signal isolation unit and a low pass filtering unit, and the signal isolation unit is connected to the low pass filtering unit.
In some embodiments of the present application, the signal isolation unit includes:
an input interface for receiving the first rotational speed signal and the second rotational speed signal;
the first end of the first resistor is connected with the input interface;
a first end of the first capacitor is connected with a second end of the first resistor, and a second end of the first capacitor is grounded;
a second capacitor, a first end of the second capacitor is grounded;
a first end of the audio transformer is connected with a second end of the first resistor and a first end of the first capacitor, and a second end of the audio transformer is connected with a second end of the second capacitor;
and a first end of the transient suppression diode is connected with a third end of the audio transformer, and a second end of the transient suppression diode is respectively connected with a fourth end of the audio transformer and the low-pass filtering unit.
In some embodiments of the present application, the low pass filtering unit includes:
a second resistor, a first end of which is connected with the signal isolation unit;
a first end of the first inductor is connected with a second end of the second resistor;
a second inductor, a first end of the second inductor being connected to a second end of the first inductor;
a first end of the third capacitor is respectively connected with a second end of the second resistor and a first end of the first inductor, and a second end of the third capacitor is grounded;
a first end of the fourth capacitor is respectively connected with the second end of the first inductor and the first end of the second inductor, and a second end of the fourth capacitor is grounded;
and a first end of the fifth capacitor is respectively connected with the second end of the second inductor and the conditioning amplification module, and a second end of the fifth capacitor is grounded.
In some embodiments of the present application, the conditioning amplification module comprises:
an amplifying unit;
a hysteresis comparison unit connected to the amplification unit;
a drive unit connected to the hysteresis comparison unit;
and the isolation unit is connected with the driving unit.
In some embodiments of the present application, the amplifying unit includes:
the first end of the third resistor is connected with the rotating speed signal filtering module;
the non-inverting input end of the instrumentation amplifier is connected with the second end of the third resistor, the inverting input end of the instrumentation amplifier is grounded, and the output end of the instrumentation amplifier is connected with the hysteresis comparison unit;
and a first end of the gain resistor is connected with a first pin of the instrumentation amplifier, and a second end of the gain resistor is connected with an eighth pin of the instrumentation amplifier.
In some embodiments of the present application, the hysteresis comparison unit includes:
a fourth resistor, a first end of the fourth resistor being grounded;
a fifth resistor, a first end of which is connected with the amplifying unit;
a first end of the sixth resistor is connected with a second end of the fourth resistor;
the non-inverting input end of the first operational amplifier is connected with the second end of the fourth resistor and the first end of the fifth resistor respectively, the inverting input end of the first operational amplifier is connected with the second end of the fifth resistor, and the output end of the first operational amplifier is connected with the second end of the sixth resistor and the driving unit respectively.
In some embodiments of the present application, the driving unit includes:
a seventh resistor, a first end of which is connected to the hysteresis comparing unit;
and the non-inverting input end of the second operational amplifier is connected with the second end of the seventh resistor, the inverting input end of the second operational amplifier is respectively connected with the isolation unit and the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the isolation unit.
In some embodiments of the present application, the isolation unit includes:
a first diode, an anode of which is connected with the driving unit;
a first end of the eighth resistor is connected with the negative electrode of the first diode;
a ninth resistor, a first end of the ninth resistor being grounded;
a sixth capacitor, a first end of the sixth capacitor is grounded;
a tenth resistor, a first end of the tenth resistor being connected to the second end of the sixth capacitor;
a first end of the eleventh resistor is connected with a second end of the tenth resistor, and a second end of the eleventh resistor is grounded;
a first pin of the optical coupler is connected with a second end of the eighth resistor, a second pin of the optical coupler is connected with a negative electrode of the first diode, a third pin of the optical coupler is connected with a second end of the ninth resistor, a fourth pin of the optical coupler is in idle connection, a fifth pin of the optical coupler is grounded, a sixth pin of the optical coupler is respectively connected with a second end of the tenth resistor and the frequency acquisition module, a seventh pin of the optical coupler is in idle connection, and an eighth pin of the optical coupler is connected with a second end of the sixth capacitor.
In a second aspect, an embodiment of the present application provides a rotation speed acquisition device, including a rotation speed acquisition circuit according to any one of the embodiments of the first aspect.
The technical solution of the second aspect of the present application has at least one of the following advantages or beneficial effects: the rotating speed acquisition device can acquire rotating speed data without calibrating rotating speed frequency through the rotating speed acquisition circuit, and the acquisition process is simple.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a block diagram of a first module structure of a rotational speed acquisition circuit according to some embodiments of the present disclosure;
fig. 2 is a block diagram of a second module of a rotational speed acquisition circuit according to some embodiments of the present disclosure;
fig. 3 is a circuit connection diagram of a signal isolation unit provided by some embodiments of the present application;
FIG. 4 is a circuit diagram of a low pass filter unit according to some embodiments of the present application;
fig. 5 is a block diagram of a module structure of a conditioning amplification module provided in some embodiments of the present application;
FIG. 6 is a circuit diagram of the amplifying unit and the hysteresis comparing unit in FIG. 5;
fig. 7 is a circuit connection diagram of the driving unit and the isolation unit in fig. 5.
Reference numerals: the rotational speed signal filtering module 110, the conditioning and amplifying module 120, the frequency acquiring module 130, the signal processing module 140, the first amplifying module 121, the second amplifying module 122, the first acquiring module 131, the second acquiring module 132, the amplifying unit 510, the hysteresis comparing unit 520, the driving unit 530, the isolating unit 540, the gain resistor R0, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C6, the fifth capacitor C5, the sixth capacitor C6, the audio transformer T1, the transient suppression diode D0, the first diode D1, the first inductor L1, the second inductor L1, the first operational amplifier U1, the second operational amplifier U1 and the second operational amplifier, An optical coupler OC 1.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The aircraft engine rotating speed acquisition device can be matched with an GCZ-1 rotating speed magnetic sensor to acquire the rotating speed of the engine and is used for monitoring the working state of the engine, protecting over-running and the like. In the related art, a frequency-voltage conversion method is usually adopted in an engine rotating speed acquisition device for rotating speed acquisition, but the method also needs to calibrate rotating speed frequency, and the acquisition process is complex.
Based on this, this application provides a rotational speed acquisition circuit and rotational speed collection system, through designing rotational speed acquisition circuit, need not mark the rotational speed frequency just can gather rotational speed data, and the acquisition process is simple.
The embodiments of the present application will be further explained with reference to the drawings.
Referring to fig. 1, some embodiments of the present application provide a rotation speed acquisition circuit, which includes a rotation speed signal filtering module 110, a conditioning amplifying module 120, a frequency acquisition module 130, and a signal processing module 140, where the conditioning amplifying module 120 is connected to the rotation speed signal filtering module 110, the frequency acquisition module 130 is connected to the conditioning amplifying module 120, and the signal processing module 140 is connected to the frequency acquisition module 130. The rotation speed signal filtering module 110 collects a rotation speed signal, divides the rotation speed signal into a first rotation speed signal and a second rotation speed signal, and performs low-pass filtering on the first rotation speed signal to output a first filtering signal and performs low-pass filtering on the second rotation speed signal to output a second filtering signal; wherein the first rotation speed signal and the second rotation speed signal are the same; the conditioning and amplifying module 120 receives the first filtered signal and the second filtered signal output by the rotation speed signal filtering module 110, conditions and amplifies the first filtered signal to output a first pulse frequency signal, and conditions and amplifies the second filtered signal to output a second pulse frequency signal; the frequency acquisition module 130 receives the first pulse frequency signal and the second pulse frequency signal output by the conditioning and amplifying module 120, converts the first pulse frequency signal to output a first digital signal, and converts the second pulse frequency signal to output a second digital signal; the signal processing module 140 receives the first digital signal and the second digital signal output by the frequency acquisition module 130, and performs filtering processing on the first digital signal to obtain first frequency data corresponding to the first rotation speed signal, and performs filtering processing on the second digital signal to obtain second frequency data corresponding to the second rotation speed signal. The embodiment of the application designs the rotating speed acquisition circuit, so that rotating speed data can be acquired without calibrating rotating speed frequency, and the acquisition process is simple.
It should be noted that, as shown in fig. 2, in some embodiments, the conditioning amplification module 120 includes a first amplification module 121 and a second amplification module 122, and the first amplification module 121 and the second amplification module 122 are the same in structure, and the frequency acquisition module 130 includes a first acquisition module 131 and a second acquisition module 132, and the first acquisition module 131 and the second acquisition module 132 are the same. The first filtered signal is conditioned and amplified by the first amplification module 121 to output a first pulse frequency signal, the first pulse frequency signal is converted by the first acquisition module 131 to output a first pulse frequency signal, and the first pulse frequency signal is filtered by the signal processing module 140 to obtain first frequency data; the second filtered signal is conditioned and amplified by the second amplifying module 122 to output a second pulse frequency signal, the first pulse frequency signal is converted by the second collecting module 132 to output a second pulse frequency signal, and the second pulse frequency signal is filtered by the signal processing module 140 to obtain second frequency data. And then, processing the first frequency data and the second frequency data, and acquiring the rotating speed data of the engine. Therefore, the embodiment of the application can enhance the reliability of the acquired frequency data by adopting a dual-redundancy design, namely, the reliability of the acquired rotating speed data is improved, and the false alarm rate is reduced.
It is understood that the redundancy design is one of the design methods for a system or a device to achieve high reliability, high safety and high survivability. Especially, when the quality and reliability level of components or parts are low and the reliability requirement of the equipment cannot be met by adopting a common design, the redundancy design has important application value. The dual-redundancy design is that two components, subsystems or channels are adopted for design, when one component, subsystem or channel fails, an accurate result can still be obtained through the other component, subsystem or channel, so that the reliability of the product is improved, and the false alarm rate is reduced. The false alarm rate refers to the probability of false alarm of the monitoring device according to the rotating speed information because the collected rotating speed information is unreliable.
In some embodiments, the tachometer signal filter module 110 includes a signal isolation unit 540 and a low pass filter unit, and the signal isolation unit 540 is connected to the low pass filter unit. The signal isolation unit 540 is adopted to divide the rotation speed signal into a first rotation speed signal and a second rotation speed signal, and avoid mutual interference of the first rotation speed signal and the second rotation speed signal, so that the anti-interference capability is improved; the low-pass filtering unit is used for filtering high-frequency interference signals. It will be appreciated that the first and second speed signals are sinusoidal signals.
In some embodiments, as shown in fig. 3, the signal isolation unit 540 includes: the audio amplifier comprises an input interface, a first resistor R1, a first capacitor C1, a second capacitor C2, an audio transformer T1 and a transient suppression diode D0. The input interface is used for receiving a first rotating speed signal and a second rotating speed signal; a first end of the first resistor R1 is connected with the input interface; a first end of the first capacitor C1 is connected with a second end of the first resistor R1, and a second end of the first capacitor C1 is grounded; a first end of the second capacitor C2 is grounded; a first end of the audio transformer T1 is connected to a second end of the first resistor R1 and a first end of the first capacitor C1, and a second end of the audio transformer T1 is connected to a second end of the second capacitor C2; a first terminal of the transient suppression diode D0 is connected to the third terminal of the audio transformer T1, and a second terminal of the transient suppression diode D0 is connected to the fourth terminal of the audio transformer T1 and the low-pass filtering unit, respectively. It can be understood that the input interface comprises a first input interface and a second input interface, the turn ratio of the primary coil and the secondary coil of the audio transformer T1 is 1:1, in practical application, a first rotation speed signal is input from the first input interface, a second rotation speed signal is input from the second input interface, the audio transformer T1 implements a rotation speed signal isolation function for isolating an externally input rotation speed signal from an internal acquisition circuit, and preventing the internal circuit from being damaged when the externally input signal is abnormal, and the transient suppression diode D0 provides voltage clamping protection. It is understood that clamping refers to a measure for limiting the potential at a certain point to a specified potential, and is an overvoltage protection technology.
In some embodiments, as shown in fig. 4, the low pass filtering unit includes: the inductor comprises a second resistor R2, a first inductor L1, a second inductor L2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5. Wherein, the first end of the second resistor R2 is connected with the signal isolation unit 540; a first end of the first inductor L1 is connected with a second end of the second resistor R2; the first end of the second inductor L2 is connected with the second end of the first inductor L1; a first end of a third capacitor C3 is respectively connected with a second end of the second resistor R2 and a first end of the first inductor L1, and a second end of the third capacitor C3 is grounded; a first end of the fourth capacitor C4 is connected to the second end of the first inductor L1 and the first end of the second inductor L2, respectively, and a second end of the fourth capacitor C4 is grounded; a first terminal of the fifth capacitor C5 is connected to the second terminal of the second inductor L2 and the conditioning and amplifying module 120, respectively, and a second terminal of the fifth capacitor C5 is grounded. The low-pass filtering unit of the embodiment of the application can filter out high-frequency interference signals to obtain first filtering signals and second filtering signals.
In some embodiments, as shown in fig. 5, the conditioning amplification module 120 includes an amplification unit 510, a hysteresis comparison unit 520, a drive unit 530, and an isolation unit 540. Wherein, the hysteresis comparing unit 520 is connected with the amplifying unit 510; the driving unit 530 is connected with the hysteresis comparing unit 520; the isolation unit 540 is connected to the driving unit 530. The amplifying unit can amplify the first filtering signal and the second filtering signal, the hysteresis comparing unit 520 can detect the first filtering signal and the second filtering signal with the amplitude meeting the requirement according to a preset detection amplitude and convert the first filtering signal and the second filtering signal into a corresponding first pulse frequency signal and a second pulse frequency signal, the driving unit 530 can improve the driving capability of the first pulse frequency signal and the second pulse frequency signal, the isolating unit 540 realizes the isolating function of an analog circuit and a digital circuit, converts the level of the first pulse frequency signal and the level of the second pulse frequency signal into a TTL level, and outputs the converted first pulse frequency signal and the converted second pulse frequency signal.
In some embodiments, as shown in fig. 6, the amplification unit 510 includes a third resistor R3, an instrumentation amplifier U1, and a gain resistor R0. The first end of the third resistor R3 is connected with the rotating speed signal filtering module 110; the non-inverting input end of the instrumentation amplifier U1 is connected with the second end of the third resistor R3, the inverting input end of the instrumentation amplifier U1 is grounded, and the output end of the instrumentation amplifier U1 is connected with the hysteresis comparison unit 520; a first end of the gain resistor R0 is connected to a first pin of the instrumentation amplifier U1, and a second end of the gain resistor R0 is connected to an eighth pin of the instrumentation amplifier U1.
In some embodiments, as shown in fig. 6, the hysteresis comparing unit 520 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first operational amplifier U2. Wherein, the first end of the fourth resistor R4 is grounded; a first end of the fifth resistor R5 is connected to the amplifying unit 510; a first end of the sixth resistor R6 is connected with a second end of the fourth resistor R4; the non-inverting input terminal of the first operational amplifier U2 is connected to the second terminal of the fourth resistor R4 and the first terminal of the fifth resistor R5, respectively, the inverting input terminal of the first operational amplifier U2 is connected to the second terminal of the fifth resistor R5, and the output terminal of the first operational amplifier U2 is connected to the second terminal of the sixth resistor R6 and the driving unit 530, respectively.
In some embodiments, as shown in fig. 7, the driving unit 530 includes a seventh resistor R7 and a second operational amplifier U3. A first end of the seventh resistor R7 is connected to the hysteresis comparing unit 520; the non-inverting input terminal of the second operational amplifier U3 is connected to the second terminal of the seventh resistor R7, the inverting input terminal of the second operational amplifier U3 is connected to the isolation unit 540 and the output terminal of the second operational amplifier U3, respectively, and the output terminal of the second operational amplifier U3 is connected to the isolation unit 540.
In some embodiments, as shown in fig. 7, the isolation unit 540 includes a first diode D1, an eighth resistor R8, a ninth resistor R9, a sixth capacitor C6, a tenth resistor R10, an eleventh resistor R11, and an optocoupler OC 1. Wherein, the anode of the first diode D1 is connected with the driving unit 530; a first end of the eighth resistor R8 is connected to the cathode of the first diode D1; a first end of the ninth resistor R9 is grounded; a first end of the sixth capacitor C6 is grounded; a first end of the tenth resistor R10 is connected to a second end of the sixth capacitor C6; a first end of the eleventh resistor R11 is connected with a second end of the tenth resistor R10, and a second end of the eleventh resistor R11 is grounded; a first pin of the optical coupler OC1 is connected to a second end of the eighth resistor R8, a second pin of the optical coupler OC1 is connected to a negative electrode of the first diode D1, a third pin of the optical coupler OC1 is connected to a second end of the ninth resistor R9, a fourth pin of the optical coupler OC1 is in air-connected, a fifth pin of the optical coupler OC1 is grounded, a sixth pin of the optical coupler OC1 is connected to a second end of the tenth resistor R10 and the frequency acquisition module 130, a seventh pin of the optical coupler OC1 is in air-connected, and an eighth pin of the optical coupler OC1 is connected to a second end of the sixth capacitor C6.
In some embodiments, the work flow of the frequency acquisition module 130 acquiring the first digital signal is as follows, and the frequency acquisition module 130 is a CPLD device, i.e., a complex programmable logic device. The frequency acquisition module 130 adopts a frequency acquisition method of frequency pulse counting, firstly, the CPLD respectively acquires the duration time of a high level signal and the duration time of a low level signal of a first pulse frequency signal by using the output frequency of the temperature compensated crystal oscillator as a basic clock, and respectively calculates the frequency data corresponding to the high and low level signals through the duration time of the level signal, respectively filtering the corresponding level signals according to the frequency data by limiting values, retaining the level signals corresponding to the frequency data which is more than 4kHz and less than 17kHz, simultaneously counting high and low levels, when the frequency data is more than 4kHz and less than 17kHz, and adding 1 to the count of the corresponding level until 33 high level signals and low level signals meeting the requirements are respectively acquired, and then comprehensively comparing the finally acquired high level signals and low level signals to obtain an effective first digital signal, wherein the first digital signal is also an effective rotating speed frequency signal. Accordingly, the workflow of the frequency acquisition module 130 for acquiring the second digital signal is similar to the workflow of the frequency acquisition module for acquiring the first digital signal, and is not described herein again.
In some embodiments, the signal processing module 140 is a single chip, receives the first digital signal and the second digital signal, and performs filtering processing on the first digital signal and the second digital signal to obtain first frequency data corresponding to the first rotation speed signal and second frequency data corresponding to the second rotation speed signal, so as to obtain the rotation speed data.
Some embodiments of this application provide a rotational speed collection system, through the rotational speed acquisition circuit who adopts above-mentioned arbitrary embodiment, need not mark the rotational speed frequency just can gather reliable rotational speed data, simplified the collection process.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (10)
1. A rotational speed acquisition circuit, comprising:
the rotating speed signal filtering module is used for acquiring a rotating speed signal, dividing the rotating speed signal into a first rotating speed signal and a second rotating speed signal, performing low-pass filtering processing on the first rotating speed signal to output a first filtering signal, and performing low-pass filtering processing on the second rotating speed signal to output a second filtering signal; wherein the first rotational speed signal and the second rotational speed signal are the same;
the conditioning and amplifying module is connected with the rotating speed signal filtering module, and is used for receiving the first filtering signal and the second filtering signal output by the rotating speed signal filtering module, conditioning and amplifying the first filtering signal to output a first pulse frequency signal, and conditioning and amplifying the second filtering signal to output a second pulse frequency signal;
the frequency acquisition module is connected with the conditioning amplification module, and is used for receiving the first pulse frequency signal and the second pulse frequency signal output by the conditioning amplification module, converting the first pulse frequency signal to output a first digital signal, and converting the second pulse frequency signal to output a second digital signal;
and the signal processing module is connected with the frequency acquisition module and used for receiving the first digital signal and the second digital signal output by the frequency acquisition module, filtering the first digital signal to obtain first frequency data corresponding to the first rotating speed signal, and filtering the second digital signal to obtain second frequency data corresponding to the second rotating speed signal.
2. The rotating speed acquisition circuit according to claim 1, wherein the rotating speed signal filtering module comprises a signal isolation unit and a low-pass filtering unit, and the signal isolation unit is connected with the low-pass filtering unit.
3. A rotational speed acquisition circuit according to claim 2, wherein the signal isolation unit comprises:
an input interface for receiving the first rotational speed signal and the second rotational speed signal;
the first end of the first resistor is connected with the input interface;
a first end of the first capacitor is connected with a second end of the first resistor, and a second end of the first capacitor is grounded;
a second capacitor, a first end of the second capacitor is grounded;
a first end of the audio transformer is connected with a second end of the first resistor and a first end of the first capacitor, and a second end of the audio transformer is connected with a second end of the second capacitor;
and a first end of the transient suppression diode is connected with a third end of the audio transformer, and a second end of the transient suppression diode is respectively connected with a fourth end of the audio transformer and the low-pass filtering unit.
4. A rotation speed acquisition circuit according to claim 2, wherein the low-pass filter unit comprises:
a second resistor, a first end of which is connected with the signal isolation unit;
a first end of the first inductor is connected with a second end of the second resistor;
a second inductor, a first end of the second inductor being connected to a second end of the first inductor;
a first end of the third capacitor is respectively connected with a second end of the second resistor and a first end of the first inductor, and a second end of the third capacitor is grounded;
a first end of the fourth capacitor is respectively connected with the second end of the first inductor and the first end of the second inductor, and a second end of the fourth capacitor is grounded;
and a first end of the fifth capacitor is respectively connected with the second end of the second inductor and the conditioning amplification module, and a second end of the fifth capacitor is grounded.
5. The rotational speed acquisition circuit according to any one of claims 1 to 4, wherein the conditioning amplification module comprises:
an amplifying unit;
a hysteresis comparison unit connected to the amplification unit;
a drive unit connected to the hysteresis comparison unit;
and the isolation unit is connected with the driving unit.
6. A rotation speed acquisition circuit according to claim 5, wherein the amplification unit comprises:
the first end of the third resistor is connected with the rotating speed signal filtering module;
the non-inverting input end of the instrumentation amplifier is connected with the second end of the third resistor, the inverting input end of the instrumentation amplifier is grounded, and the output end of the instrumentation amplifier is connected with the hysteresis comparison unit;
and a first end of the gain resistor is connected with a first pin of the instrumentation amplifier, and a second end of the gain resistor is connected with an eighth pin of the instrumentation amplifier.
7. A rotational speed acquisition circuit according to claim 5, wherein the hysteresis comparison unit comprises:
a fourth resistor, a first end of the fourth resistor being grounded;
a fifth resistor, a first end of which is connected with the amplifying unit;
a first end of the sixth resistor is connected with a second end of the fourth resistor;
the non-inverting input end of the first operational amplifier is connected with the second end of the fourth resistor and the first end of the fifth resistor respectively, the inverting input end of the first operational amplifier is connected with the second end of the fifth resistor, and the output end of the first operational amplifier is connected with the second end of the sixth resistor and the driving unit respectively.
8. A rotational speed acquisition circuit according to claim 5, wherein the drive unit comprises:
a seventh resistor, a first end of which is connected to the hysteresis comparing unit;
and the non-inverting input end of the second operational amplifier is connected with the second end of the seventh resistor, the inverting input end of the second operational amplifier is respectively connected with the isolation unit and the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the isolation unit.
9. A speed acquisition circuit according to claim 5, wherein the isolation unit comprises:
a first diode, an anode of which is connected with the driving unit;
a first end of the eighth resistor is connected with the negative electrode of the first diode;
a ninth resistor, a first end of the ninth resistor being grounded;
a sixth capacitor, a first end of the sixth capacitor is grounded;
a tenth resistor, a first end of the tenth resistor being connected to the second end of the sixth capacitor;
a first end of the eleventh resistor is connected with a second end of the tenth resistor, and a second end of the eleventh resistor is grounded;
a first pin of the optical coupler is connected with a second end of the eighth resistor, a second pin of the optical coupler is connected with a negative electrode of the first diode, a third pin of the optical coupler is connected with a second end of the ninth resistor, a fourth pin of the optical coupler is in idle connection, a fifth pin of the optical coupler is grounded, a sixth pin of the optical coupler is respectively connected with a second end of the tenth resistor and the frequency acquisition module, a seventh pin of the optical coupler is in idle connection, and an eighth pin of the optical coupler is connected with a second end of the sixth capacitor.
10. A rotational speed acquisition device, comprising: a speed acquisition circuit according to any of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024113857A1 (en) * | 2022-11-28 | 2024-06-06 | 中船动力研究院有限公司 | Speed threshold device and engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024113857A1 (en) * | 2022-11-28 | 2024-06-06 | 中船动力研究院有限公司 | Speed threshold device and engine |
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