CN111999520A - Signal detection device - Google Patents
Signal detection device Download PDFInfo
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- CN111999520A CN111999520A CN202011166620.4A CN202011166620A CN111999520A CN 111999520 A CN111999520 A CN 111999520A CN 202011166620 A CN202011166620 A CN 202011166620A CN 111999520 A CN111999520 A CN 111999520A
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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
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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
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
- G01P13/04—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
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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
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
Abstract
The invention provides a signal detection device, which is applied to the technical field of rail vehicles and comprises at least one path of signal detection circuit, wherein the signal detection circuit comprises: the system comprises a self-checking module, a gating module, a signal processing module and a control module, wherein the control module is used for controlling the gating module and the signal processing module to operate in a working mode or a self-checking mode. Under the working mode, speed signal detection and train running direction judgment are carried out on the basis of two paths of sensor signals fed back by a speed sensor; in the self-checking mode, the self-checking is completed based on the self-checking signal output by the self-checking module and the preset detection standard, the signal detection device provided by the invention not only can realize the established function of the signal detection device in the prior art, but also can complete the self-checking operation in the self-checking mode to detect whether the device is normal or not, so that the accuracy of the fed-back speed signal detection result is ensured, and the running safety of a rail train is improved.
Description
Technical Field
The invention belongs to the technical field of railway vehicles, and particularly relates to a signal detection device.
Background
The speed signal of the rail train is a key input signal in a modern train control system, and extremely important control flows such as train traction, brake control, wheel idle protection, train signal control, car door locking control and the like can be realized only based on an accurate and credible speed signal. Therefore, the speed signal is accurately and timely acquired and detected, and the driving safety and the operation efficiency are directly influenced.
In order to realize redundancy safety, a modern train often sets speed sensors at a plurality of wheel axles in a train body, each speed sensor can output sensor signals with two paths of different phases, an existing signal detection device is provided with two paths of detection channels, receives the two paths of sensor signals of the same speed sensor respectively, and completes corresponding speed signal detection and train running direction judgment based on the two paths of sensor signals, so that a two-out-of-two safety detection mechanism is realized.
However, as an important component of a modern train control system, the existing signal detection device does not have a self-checking function, and cannot effectively detect the working state of the signal detection device, so that it is difficult to ensure the accuracy of the feedback speed signal detection result, and even the operation safety of the rail train is affected.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a signal detection device, which has a self-checking function, and can detect whether the device itself is normal, so as to ensure the accuracy of the feedback speed signal detection result, and ensure the safe operation of a rail train, and the specific scheme is as follows:
the present invention provides a signal detection device, including: at least one way signal detection circuit, signal detection circuit includes: a self-checking module, a gating module, a signal processing module and a control module, wherein,
the control module is respectively connected with the gating module and the control end of the signal processing module and is used for controlling the operation modes of the gating module and the signal processing module, wherein the operation modes comprise a working mode and a self-checking mode;
the input end of the gating module is respectively connected with the self-checking module and the speed sensor, and the output end of the gating module is connected with the signal processing module;
the gating module is used for transmitting two paths of sensor signals of the speed sensor to the signal processing module in the working mode, or transmitting a self-checking signal output by the self-checking module to the signal processing module in the self-checking mode;
the signal processing module is used for respectively converting the two paths of sensor signals into corresponding digital quantity sensor signals in the working mode, or converting the self-checking signals into digital quantity self-checking signals in the self-checking mode;
and the control module is also used for detecting speed signals and judging the running direction of the train according to the two paths of digital quantity sensor signals, or completing self-checking according to the digital quantity self-checking signals and a preset detection standard.
Optionally, the gating module includes a first gating circuit and a second gating circuit, wherein,
the input end of the first gating circuit is respectively connected with the self-checking module and the first output end of the speed sensor, and the output end of the first gating circuit is connected with the signal processing module;
the input end of the second gating circuit is respectively connected with the self-checking module and the second output end of the speed sensor, and the output end of the second gating circuit is connected with the signal processing module.
Optionally, the signal processing module includes a first signal processing circuit and a second signal processing circuit, wherein,
the first signal processing circuit and the second signal processing circuit are signal processing circuits having the same structure, and the signal processing circuit includes: an amplitude sampling circuit and a frequency sampling circuit, wherein,
the amplitude sampling circuit is used for converting the analog quantity amplitude of the sensor signal or the self-checking signal into a corresponding digital quantity amplitude;
the frequency sampling circuit is used for converting the frequency value of the sensor signal or the self-checking signal into a corresponding digital value frequency value;
an amplitude sampling circuit in the first signal processing circuit is respectively connected with the output ends of the first gating circuit and the second gating circuit;
a frequency sampling circuit in the first signal processing circuit is connected with the output end of the first gating circuit;
an amplitude sampling circuit in the second signal processing circuit is respectively connected with the output ends of the first gating circuit and the second gating circuit;
and a frequency sampling circuit in the second signal processing circuit is connected with the output end of the second gating circuit.
Optionally, the self-checking module includes a first self-checking circuit and a second self-checking circuit, wherein,
the first self-checking circuit is connected with the input end of the first gating circuit;
the second self-checking circuit is connected with the input end of the second gating circuit;
the first self-checking circuit and the second self-checking circuit are self-checking circuits with the same structure, and the self-checking circuits comprise: a waveform generator and an operational amplifier, wherein,
the first input end of the operational amplifier is connected with the waveform generator and receives a detection wave signal of the waveform generator;
a second input terminal of the operational amplifier receives a bias voltage;
and the output end of the operational amplifier is used as the output end of the self-checking circuit to output a self-checking signal.
Optionally, the method further includes: a power module, wherein,
the control end of the power supply module is connected with the control module, and the voltage output end of the power supply module is respectively connected with the second input end of the operational amplifier in the self-checking circuit and the power end of the speed sensor;
the power module is used for outputting voltage corresponding to the control signal output by the control module.
Optionally, the signal processing module further includes: a digital isolator;
the input end of the digital isolator is respectively connected with the first signal processing circuit and the second signal processing circuit;
and the output end of the digital isolator is connected with the control module.
Optionally, the control module is further configured to detect a working state of the speed sensor according to a preset electrical parameter, where the preset electrical parameter includes at least one of a sensor signal frequency, a sensor signal amplitude, a sensor signal phase, a sensor supply voltage, a sensor supply current, and a sensor output impedance.
Optionally, the amplitude sampling circuit includes: a first proportional attenuator, a second proportional attenuator, a state detector, and an analog-to-digital converter, wherein,
the input end of the first proportional attenuator is connected with the positive pole in the output end of the speed sensor;
the input end of the state detector is connected with the negative electrode in the output end of the speed sensor;
the input end of the second proportional attenuator is connected with the self-checking module;
the output ends of the first proportional attenuator, the second proportional attenuator and the state detector are respectively connected with the input end of the analog-digital converter;
the output end of the analog-digital converter is used as the output end of the amplitude sampling circuit;
and the control end of the analog-digital converter is used as the control end of the signal processing module and is connected with the control module.
Optionally, the frequency sampling circuit includes: a filter, a hysteretic comparator, and an output buffer, wherein,
the input end of the filter is connected with the positive pole in the output end of the speed sensor;
the output end of the filter is connected with the input end of the output buffer through the hysteresis comparator;
and the output end of the output buffer is used as the output end of the frequency sampling circuit.
Optionally, the first gating circuit and the second gating circuit are gating circuits with the same structure, and the gating circuits include: a first gate input terminal, a second gate input terminal, a gate output terminal, and a gate link circuit, wherein,
the first gating input end receives the self-checking signal;
the second gating input terminal receives the sensor signal;
the gating output end is connected with the signal processing module;
and the control end of the gating connecting circuit is connected with the control module, and the gating connecting circuit is used for communicating the second gating input end with the gating output end in the working mode or communicating the first gating input end with the gating output end in the self-checking mode.
Based on the above technical solution, the signal detection apparatus provided by the present invention includes at least one signal detection circuit, and the signal detection circuit includes: the system comprises a self-checking module, a gating module, a signal processing module and a control module, wherein the control module is used for controlling the gating module and the signal processing module to operate in a working mode or a self-checking mode. In the working mode, the gating module transmits two paths of sensor signals of the speed sensor to the signal processing module, the signal processing module respectively converts the two paths of sensor signals into corresponding digital sensor signals, and the control module detects the speed signal and judges the train running direction according to the two paths of digital sensor signals; in the self-checking mode, the gating module transmits a self-checking signal output by the self-checking module to the signal processing module, the signal processing module converts the self-checking signal into a digital quantity self-checking signal and sends the digital quantity self-checking signal to the control module, and the control module completes self-checking according to the digital quantity self-checking signal and a preset detection standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a signal detection apparatus according to an embodiment of the present invention;
fig. 2 is a block diagram of another signal detection apparatus according to an embodiment of the present invention;
fig. 3 is a block diagram of a gate circuit in the signal detection apparatus according to the embodiment of the present invention;
fig. 4 is a block diagram of a self-checking circuit in the signal detection apparatus according to the embodiment of the present invention;
fig. 5 is a block diagram of a power module in the signal detection apparatus according to the embodiment of the present invention;
fig. 6 is a block diagram of an amplitude sampling circuit in the signal detection apparatus according to the embodiment of the present invention;
fig. 7 is a block diagram of a frequency sampling circuit in the signal detection apparatus according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Optionally, referring to fig. 1, fig. 1 is a block diagram of a signal detection apparatus according to an embodiment of the present invention, as shown in fig. 1, the signal detection apparatus according to the embodiment of the present invention includes at least one signal detection circuit (shown by 1 in fig. 1), and in practical applications, each signal detection circuit may correspond to one speed sensor that outputs two sensor signals, so that if the signal detection apparatus according to the embodiment of the present invention includes two or more signal detection circuits in practical applications, signal detection of multiple speed sensors may be simultaneously completed.
Specifically, each of the signal detection devices includes: a self-checking module, a gating module, a signal processing module and a control module, wherein,
the control module is respectively connected with the control ends of the gating module and the signal processing module, and when the control module is in actual application, the control module can control the operation modes of the gating module and the signal processing module based on the actual application requirements, wherein in the embodiment of the invention, the operation modes of the gating module and the signal processing module at least comprise a working mode and a self-checking mode. As the name implies, the operation mode is a mode corresponding to the detection of the sensor signal of the speed sensor by the signal detection device, and the self-test mode is a mode corresponding to the detection of the operation state of the signal detection device.
The self-checking module is used for generating a self-checking signal. Alternatively, the self-test signal may be any signal having a regular waveform or transmission rule and capable of being accurately detected, such as a square wave signal. In the embodiment of the present invention, the specific selection of the self-test signal is not limited. It is contemplated that in order to facilitate the control module to identify the self-test signal and the sensor signal, the self-test signal should preferably be selected to have a significant difference from the sensor signal.
Furthermore, the input end of the gating module is respectively connected with the self-checking module and the speed sensor, and the output end of the gating module is connected with the signal processing module. Specifically, the gating module is configured to transmit two sensor signals of the speed sensor to the signal processing module in the operating mode, or transmit a self-checking signal output by the self-checking module to the signal processing module in the self-checking mode. It is conceivable that in both modes of operation, the signal detection means can be in only one of the above-mentioned operating states at any time, so that the gating module, when in operation, transmits either the sensor signal or the self-test signal.
Because the self-checking signal and the sensor signal have obvious difference, and the signal processing module needs to process the signals respectively, in the working mode, the signal processing module converts the two paths of sensor signals into corresponding digital quantity sensor signals respectively, and in the self-checking mode, the signal processing module converts the self-checking signal into a digital quantity self-checking signal.
Based on the above, in the working mode, the control module provided by the embodiment of the invention detects the speed signal and judges the train running direction according to the two paths of digital quantity sensor signals. It should be noted that the detection of the speed signal and the judgment of the train running direction can be implemented by methods in the prior art, the predetermined function of the signal detection device is implemented according to a two-out-of-two safety mechanism, and the implementation of the two-out-of-two safety mechanism, the detection of the speed signal and the judgment of the train running direction can be implemented by referring to the prior art, which is not specifically limited by the present invention.
And in the self-checking mode, the control module completes self-checking according to the obtained digital quantity self-checking signal and a preset detection standard. As an optional implementation manner, the preset detection standard mentioned in the embodiment of the present invention may be a standard waveform corresponding to the self-checking signal, and in the self-checking mode, if the control module can smoothly receive the self-checking signal, and the obtained self-checking signal is consistent with the pre-stored standard waveform, or meets the corresponding deviation requirement, it may be determined that the signal received by the gating module can be effectively detected, and the detection signal detection apparatus is in a normal state; on the contrary, if the control module does not receive the self-test signal, or the obtained self-test signal does not conform to the pre-stored standard waveform, it can be determined that the signal detection device has a fault, and accordingly, the detection result of the speed sensor signal is inaccurate.
In summary, the signal detection apparatus provided by the present invention includes at least one signal detection circuit, where the signal detection circuit includes: the system comprises a self-checking module, a gating module, a signal processing module and a control module, wherein the control module is used for controlling the gating module and the signal processing module to operate in a working mode or a self-checking mode. In the working mode, the gating module transmits two paths of sensor signals of the speed sensor to the signal processing module, the signal processing module respectively converts the two paths of sensor signals into corresponding digital sensor signals, and the control module detects the speed signal and judges the train running direction according to the two paths of digital sensor signals; in the self-checking mode, the gating module transmits a self-checking signal output by the self-checking module to the signal processing module, the signal processing module converts the self-checking signal into a digital quantity self-checking signal and sends the digital quantity self-checking signal to the control module, and the control module completes self-checking according to the digital quantity self-checking signal and a preset detection standard.
In the field of rail transit, a used speed sensor mostly provides two paths of sensor signals, and a phase difference is preset between the two paths of sensor signals so as to realize the detection of the traveling direction. The signal detection device provided by the embodiment of the present invention is further described below by taking an application scenario corresponding to a speed sensor providing two sensor signals as an example.
Optionally, referring to fig. 2, fig. 2 is a block diagram of another signal detection apparatus according to an embodiment of the present invention, and based on the embodiment shown in fig. 1, the signal detection apparatus according to the embodiment further provides optional configurations of the modules, and also includes other newly added modules.
Optionally, the gating module includes a first gating circuit and a second gating circuit, an input end of the first gating circuit is connected to the first output end of the self-test module speed sensor, and an output end of the first gating circuit is connected to the signal processing module. Similar to the connection condition of the first gating circuit, the input end of the second gating circuit is connected with the self-checking module and the second output end of the speed sensor respectively, and the output end of the second gating circuit is connected with the signal processing module.
In this embodiment, the first gate circuit and the second gate circuit are gate circuits having the same structure, and the gate circuits include: the gate circuit comprises a first gate input end, a second gate input end, a gate output end and a gate connecting circuit. Optionally, referring to fig. 3, fig. 3 is a block diagram of a gating circuit in the signal detection apparatus according to the embodiment of the present invention, and it can be seen that the input end of the gating circuit may further include more inputs, which may be specifically selected according to actual application requirements.
Specifically, in this embodiment, the first gating input terminal of the gating circuit receives the self-test signal, and the second gating input terminal receives the sensor signal, and in actual application, the gating circuit may be any one of the two sensor signals, and specifically which one of the two sensor signals needs to be determined according to a specific connection condition. The gating output end is connected with the signal processing module.
Furthermore, the control end of the gating connection circuit is connected with the control module, and the working modes are switched according to the control signals sent by the control module, so that different channels are communicated under different working modes. And communicating the second gating input end with the gating output end in the working mode, or communicating the first gating input end with the gating output end in the self-checking mode. It is contemplated that only one path of the gating circuit is in a connected state at the same time.
In practical application, the gating circuit can be realized based on a multi-contact signal relay or a multi-path analog switch and other devices.
Optionally, the self-checking module includes a first self-checking circuit and a second self-checking circuit, and in the specific connection process, the first self-checking circuit is connected to the input end of the first gating circuit and is configured to provide a self-checking signal for a signal transmission path corresponding to the first gating circuit; the second self-checking circuit is connected with the input end of the second gating circuit and is used for providing a self-checking signal for a signal transmission path corresponding to the second gating circuit.
In this embodiment of the present invention, the first self-checking circuit and the second self-checking circuit are self-checking circuits having the same structure, optionally, referring to fig. 4, fig. 4 is a block diagram of a self-checking circuit in the signal detection apparatus provided in this embodiment of the present invention, where the self-checking circuit includes: a waveform generator and an operational amplifier, wherein,
the first input end of the operational amplifier is connected with the waveform generator and receives a detection wave signal of the waveform generator, the second input end of the operational amplifier receives the bias voltage, and the output end of the operational amplifier serves as the output end of the self-checking circuit to output a self-checking signal.
According to the basic structure of the self-checking circuit, the waveform generator of the self-checking circuit provided by the embodiment of the invention generates the detection wave signal, the detection wave signal is biased by the bias voltage and then is connected to the amplitude acquisition circuit and the frequency acquisition circuit through the gating circuit, and the self-checking test of the integrity of the signal transmission channel can be realized after the separation and the digitization are carried out.
Further, as shown in fig. 2, the signal detection apparatus provided in the embodiment of the present invention further includes a power module. And the voltage output end of the power supply module is respectively connected with the second input end of the operational amplifier in the self-checking circuit and the power supply end of the speed sensor. Based on the connection relation, the power supply module supplies power to the speed sensor and simultaneously provides bias voltage for the first self-checking circuit and the second self-checking circuit. Therefore, the signal detection device provided by the embodiment can also detect whether the power supply of the speed sensor is normal or not at the same time. And the control end of the power supply module is connected with the control module and outputs voltage corresponding to the control signal output by the control module.
It is conceivable that, in practical applications, the speed sensor is divided into an active type and a passive type, the active type speed sensor needs the power supply module to provide power to work, such as a hall type speed sensor, a photoelectric type speed sensor, and the like, and the passive type speed sensor does not need an external power supply to work, such as a tachometer motor type speed sensor. Therefore, in practical application, whether the power supply module needs to be arranged or not is further determined according to the specific type of the matched speed sensor.
For an active speed sensor, rated operating voltages of speed sensors of different models may be different, and in order to improve the universality and the flexibility of a hardware system of the signal detection device provided by the embodiment of the invention, the power supply module may be implemented based on a programmed power supply.
Optionally, referring to fig. 5, fig. 5 is a block diagram of a power module in the signal detection apparatus according to the embodiment of the present invention. As shown in fig. 5, the control terminal of the programmable power supply is connected to the control module as the control terminal of the power supply module, receives the control signal of the control module, and configures different voltage outputs, such as 24V and 15V, according to the control signal, so as to adapt to speed sensors of different models. Meanwhile, the programmable power supply can feed back the output voltage and current to the control module in real time for assisting in judging the power consumption and the health condition of the speed sensor. Specifically, the power module may use a UART interface to communicate with the control module, receive a control command, and feed back output voltage and current values.
Optionally, the signal processing module includes a first signal processing circuit and a second signal processing circuit, where the first signal processing circuit and the second signal processing circuit are signal processing circuits with the same structure, and the signal processing circuit includes: amplitude sampling circuit and frequency sampling circuit.
Specifically, the amplitude sampling circuit is used for converting an analog quantity amplitude of the sensor signal or the self-test signal into a corresponding digital quantity amplitude, and the frequency sampling circuit is used for converting a frequency value of the sensor signal or the self-test signal into a corresponding digital quantity frequency value. When the method is applied specifically, an amplitude sampling circuit in the first signal processing circuit is connected with the output ends of the first gating circuit and the second gating circuit respectively, so that the acquisition and conversion of two paths of sensor signals are realized. Correspondingly, the amplitude sampling circuit in the second signal processing circuit is respectively connected with the output ends of the first gating circuit and the second gating circuit.
And a frequency sampling circuit in the first signal processing circuit is connected with the output end of the first gating circuit and is used for acquiring and converting the frequency of a sensor signal or a self-checking signal output by the first output end of the speed sensor.
And a frequency sampling circuit in the second signal processing circuit is connected with the output end of the second gating circuit and is used for acquiring and converting the frequency of a sensor signal or a self-checking signal output by the second output end of the speed sensor.
Optionally, referring to fig. 6, fig. 6 is a block diagram of a structure of an amplitude sampling circuit in the signal detection apparatus according to the embodiment of the present invention. As shown in fig. 6, the amplitude sampling circuit includes: a first proportional attenuator, a second proportional attenuator, a state detector, and an analog-to-digital converter, wherein,
the input of the first proportional attenuator is connected to the positive of the output of the speed sensor, i.e. "conditioned signal input +" shown in fig. 6; the input of the status detector is connected to the negative of the outputs of the speed sensor, i.e. "conditioned signal input-" as shown in fig. 6. The input end of the second proportional attenuator is connected with the self-checking module and receives the self-checking signal.
The output ends of the first proportional attenuator, the second proportional attenuator and the state detector are respectively connected with the input end of the analog-digital converter, and the output end of the analog-digital converter is used as the output end of the amplitude sampling circuit to output a digital quantity sensor signal or a digital quantity self-checking signal.
And the control end of the analog-digital converter is used as the control end of the signal processing module and is connected with the control module, and the control end receives the control signal of the control module, so that the switching of the operation mode is realized.
It should be emphasized that the above connection relationship and the block diagram shown in fig. 6 are only simple illustrations of the principle of the amplitude acquisition circuit, the first proportional attenuator receives and processes the signal provided by the positive pole of the output terminal of the speed sensor, the state detector receives and processes the signal provided by the negative pole of the output terminal of the speed sensor, and the second proportional attenuator receives and processes the self-test signal output by the self-test module. In practical applications, in order to process two or even multiple sensor signals, the analog-to-digital converter employs multiple analog-to-digital converters, and accordingly, in practical applications, the first proportional attenuator and the state detector are provided in multiple sets, each set corresponding to an output terminal of the speed sensor. That is, for the speed sensor providing two sensor signals in the prior art, two first proportional attenuators and two state detectors are required to be arranged in the same amplitude acquisition circuit.
Correspondingly, the same amplitude sampling circuit only needs to process one path of self-checking signal, so in practical application, the second proportional attenuation circuit in the same amplitude sampling circuit can only be provided with one path. Based on the structural block diagram shown in fig. 6, the amplitude sampling circuit acquires a speed sensor signal or a self-checking signal, performs proportional attenuation, converts an analog quantity signal into a digital quantity signal, and sends the digital quantity signal to the post-stage circuit through the digital bus interface. The state detector is connected in series with the negative electrode of the output end of the speed sensor, can detect the state of a working loop of the speed sensor, and can output abnormal indication when a speed signal line is open or the output characteristic of the speed sensor changes, thereby assisting in judging the health condition of the speed sensor.
Furthermore, under the condition that the self-detection signal is a biased detection wave signal, the amplitude sampling circuit can also separately detect the bias voltage in the self-detection signal and is used for power supply test of the speed sensor.
In practical applications, the analog-to-digital converter receives control signals from the control module, including initialization setting of the analog-to-digital converter, selection/sorting of conversion channels, selection of conversion rate, and the like, and these control processes can be implemented based on the prior art, which is not limited in the present invention.
The digital bus interface converted by the analog-to-digital converter used in this embodiment may be of a common type such as SPI, IIC, UART, or the like, depending on the device.
Alternatively, referring to fig. 7, fig. 7 is a block diagram of a frequency sampling circuit in the signal detection apparatus according to the embodiment of the present invention. As shown in fig. 7, the frequency sampling circuit provided in this embodiment includes: a filter, a hysteretic comparator, and an output buffer, wherein,
the input end of the filter is connected with the positive pole in the output end of the speed sensor; the output end of the filter is connected with the input end of the output buffer through the hysteresis comparator; the output end of the output buffer is used as the output end of the frequency sampling circuit to output the digital value frequency value meeting the preset requirement.
The frequency signal can be filtered, hysteresis compared, judged by an effective threshold value and output and buffered by a frequency sampling circuit and then sent to a post-stage circuit.
Optionally, in order to achieve electrical isolation, level matching, and signal transmission between the field side and the control module side of the speed sensor, the signal processing module in the signal detection apparatus provided in any of the above embodiments further includes: a digital isolator. Specifically, the input end of the digital isolator is connected with the first signal processing circuit and the second signal processing circuit respectively, and the output end of the digital isolator is connected with the control module.
In practical application, the digital isolator is realized by one of a high-speed capacitive coupler and a high-speed magnetic coupler. Therefore, the problems of light decay, poor parameter consistency, low speed and the like caused by using a photoelectric coupler can be avoided.
It should be noted that, in the structural block diagram shown in fig. 2, in order to clearly show the transmission path of each signal, the digital isolators are embodied by four block diagrams, in an actual implementation process, it does not mean that four digital isolators need to be arranged, and under the condition that the digital isolators function or the signal transmission channel operates, the digital isolators can be completely realized by one or two digital isolators, and the arrangement condition of the digital isolators shown in fig. 2 is not taken as a limitation or an explanation on the arrangement number of the digital isolators, but is only an illustration of the signal transmission path.
Accordingly, in the specific implementation, on the premise of implementing the same function, the specific constituent parts of the signal detection circuit shown in fig. 2 may also be implemented by one existing device, for example, the first gating circuit and the second gating circuit, and in the case of implementing based on a multi-path analog switch, the specific circuit may be built by using one multi-path analog switch.
Further, in any of the above embodiments, the control module may include two independent controllers, that is, the first controller and the second controller shown in fig. 2, in a specific functional division, the functions implemented by the first controller and the second controller are substantially the same, and both the first controller and the second controller may detect the vehicle running speed and determine the train running direction based on the obtained two sensor signals, and upload the obtained calculation result to a subsequent system through a system bus of a corresponding channel, and meanwhile, the first controller and the second controller may obtain a corresponding calculation result through a data exchange bus, thereby implementing a safety mechanism of taking two from two.
Specifically, based on the above-mentioned structural block diagrams provided in the embodiments, the control module in the signal detection apparatus provided in any embodiment of the present invention can implement the following functions:
receiving and executing configuration commands from a control system through a system bus, such as speed sensor types, number, supply voltage, sampling rate, sampling type (self-test or valid signal), and the like;
the related control signals are sent to a gating module, a signal processing module and a power supply module to supply power to the speed sensor and control acquisition operation;
analyzing and calculating the collected frequency and amplitude signals of the speed sensor by combining the wheel diameter and the output curve of the speed sensor to obtain the speed information of the train;
carrying out phase detection on the two collected frequency signals to obtain train running direction information;
the obtained speed information and direction information of the two channels are exchanged and compared, and the speed information and the direction information are sent to a control system through a system bus according to a specified communication protocol after the safety consistency is confirmed;
detecting the working state of the speed sensor according to preset electrical parameters, wherein the preset electrical parameters comprise at least one of sensor signal frequency, sensor signal amplitude, sensor signal phase, sensor power supply voltage, sensor power supply current and sensor output impedance;
and reporting specified diagnosis information such as the address of the board, self-checking information, the working state of the sensor and the like to the control system through a system bus.
In the concrete implementation, in order to adapt to the characteristic of long life cycle of railway products, the controller in the control module can be flexibly realized by selecting different types of devices, including CPU devices with different kernels such as ARM, DSP and PowerPC, or programmable logic devices such as CPLD and FPGA.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A signal detection device, comprising: at least one way signal detection circuit, signal detection circuit includes: a self-checking module, a gating module, a signal processing module and a control module, wherein,
the control module is respectively connected with the gating module and the control end of the signal processing module and is used for controlling the operation modes of the gating module and the signal processing module, wherein the operation modes comprise a working mode and a self-checking mode;
the input end of the gating module is respectively connected with the self-checking module and the speed sensor, and the output end of the gating module is connected with the signal processing module;
the gating module is used for transmitting two paths of sensor signals of the speed sensor to the signal processing module in the working mode, or transmitting a self-checking signal output by the self-checking module to the signal processing module in the self-checking mode;
the signal processing module is used for respectively converting the two paths of sensor signals into corresponding digital quantity sensor signals in the working mode, or converting the self-checking signals into digital quantity self-checking signals in the self-checking mode;
and the control module is also used for detecting speed signals and judging the running direction of the train according to the two paths of digital quantity sensor signals, or completing self-checking according to the digital quantity self-checking signals and a preset detection standard.
2. The signal detection apparatus of claim 1, wherein the gating module comprises a first gating circuit and a second gating circuit, wherein,
the input end of the first gating circuit is respectively connected with the self-checking module and the first output end of the speed sensor, and the output end of the first gating circuit is connected with the signal processing module;
the input end of the second gating circuit is respectively connected with the self-checking module and the second output end of the speed sensor, and the output end of the second gating circuit is connected with the signal processing module.
3. The signal detection apparatus of claim 2, wherein the signal processing module comprises a first signal processing circuit and a second signal processing circuit, wherein,
the first signal processing circuit and the second signal processing circuit are signal processing circuits having the same structure, and the signal processing circuit includes: an amplitude sampling circuit and a frequency sampling circuit, wherein,
the amplitude sampling circuit is used for converting the analog quantity amplitude of the sensor signal or the self-checking signal into a corresponding digital quantity amplitude;
the frequency sampling circuit is used for converting the frequency value of the sensor signal or the self-checking signal into a corresponding digital value frequency value;
an amplitude sampling circuit in the first signal processing circuit is respectively connected with the output ends of the first gating circuit and the second gating circuit;
a frequency sampling circuit in the first signal processing circuit is connected with the output end of the first gating circuit;
an amplitude sampling circuit in the second signal processing circuit is respectively connected with the output ends of the first gating circuit and the second gating circuit;
and a frequency sampling circuit in the second signal processing circuit is connected with the output end of the second gating circuit.
4. The signal detection device of claim 2, wherein the self-test module comprises a first self-test circuit and a second self-test circuit, wherein,
the first self-checking circuit is connected with the input end of the first gating circuit;
the second self-checking circuit is connected with the input end of the second gating circuit;
the first self-checking circuit and the second self-checking circuit are self-checking circuits with the same structure, and the self-checking circuits comprise: a waveform generator and an operational amplifier, wherein,
the first input end of the operational amplifier is connected with the waveform generator and receives a detection wave signal of the waveform generator;
a second input terminal of the operational amplifier receives a bias voltage;
and the output end of the operational amplifier is used as the output end of the self-checking circuit to output a self-checking signal.
5. The signal detection device according to claim 4, further comprising: a power module, wherein,
the control end of the power supply module is connected with the control module, and the voltage output end of the power supply module is respectively connected with the second input end of the operational amplifier in the self-checking circuit and the power end of the speed sensor;
the power module is used for outputting voltage corresponding to the control signal output by the control module.
6. The signal detection device of claim 3, wherein the signal processing module further comprises: a digital isolator;
the input end of the digital isolator is respectively connected with the first signal processing circuit and the second signal processing circuit;
and the output end of the digital isolator is connected with the control module.
7. The signal detection device of claim 1, wherein the control module is further configured to detect the operating state of the speed sensor according to a preset electrical parameter, wherein the preset electrical parameter comprises at least one of a sensor signal frequency, a sensor signal amplitude, a sensor signal phase, a sensor supply voltage, a sensor supply current, and a sensor output impedance.
8. The signal detection device of claim 3, wherein the amplitude sampling circuit comprises: a first proportional attenuator, a second proportional attenuator, a state detector, and an analog-to-digital converter, wherein,
the input end of the first proportional attenuator is connected with the positive pole in the output end of the speed sensor;
the input end of the state detector is connected with the negative electrode in the output end of the speed sensor;
the input end of the second proportional attenuator is connected with the self-checking module;
the output ends of the first proportional attenuator, the second proportional attenuator and the state detector are respectively connected with the input end of the analog-digital converter;
the output end of the analog-digital converter is used as the output end of the amplitude sampling circuit;
and the control end of the analog-digital converter is used as the control end of the signal processing module and is connected with the control module.
9. The signal detection device of claim 3, wherein the frequency sampling circuit comprises: a filter, a hysteretic comparator, and an output buffer, wherein,
the input end of the filter is connected with the positive pole in the output end of the speed sensor;
the output end of the filter is connected with the input end of the output buffer through the hysteresis comparator;
and the output end of the output buffer is used as the output end of the frequency sampling circuit.
10. The signal detection device according to claim 2, wherein the first gate circuit and the second gate circuit are gate circuits having the same structure, the gate circuits including: a first gate input terminal, a second gate input terminal, a gate output terminal, and a gate link circuit, wherein,
the first gating input end receives the self-checking signal;
the second gating input terminal receives the sensor signal;
the gating output end is connected with the signal processing module;
and the control end of the gating connecting circuit is connected with the control module, and the gating connecting circuit is used for communicating the second gating input end with the gating output end in the working mode or communicating the first gating input end with the gating output end in the self-checking mode.
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