CN110873828A - DC circuit monitoring system for railway passenger vehicle - Google Patents
DC circuit monitoring system for railway passenger vehicle Download PDFInfo
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- CN110873828A CN110873828A CN201811011128.2A CN201811011128A CN110873828A CN 110873828 A CN110873828 A CN 110873828A CN 201811011128 A CN201811011128 A CN 201811011128A CN 110873828 A CN110873828 A CN 110873828A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
Abstract
The invention discloses a DC circuit monitoring system for railway passenger vehicle, which comprises: the data acquisition module is connected with the detected direct current signals in each direct current control loop of the railway passenger vehicle to acquire the current of the detected direct current signals, and the corresponding direct current acquisition signals are acquired after the self-oscillation, conditioning and filtering actions; the data processing and diagnosis module is connected with each data acquisition module, respectively judges the abnormity of each acquired direct current acquisition signal and outputs corresponding diagnosis information; and the information display module is connected with the data processing and diagnosis module, acquires and analyzes each diagnosis information, displays the detected current value of each direct current control loop, and starts the alarm indicating device under the abnormal condition. The invention realizes the functions of real-time monitoring, state evaluation, fault diagnosis, man-machine interaction and the like of the direct current signal of the passenger vehicle, and effectively improves the driving safety and stability of the vehicle.
Description
Technical Field
The invention relates to the field of signal monitoring, in particular to a direct current circuit monitoring system for a railway passenger vehicle.
Background
With the continuous development of railway vehicle control technology, the product function is complex, most of vehicle circuits adopt direct current control, only a main power loop circuit of a vehicle is monitored by a direct current signal, and other control signals have no reliable monitoring mode. Under the condition, faults are not easy to position and solve quickly in the running process of the vehicle, the running of the vehicle with the faults is caused to cause great hidden dangers in driving safety, and the safety and the reliability are difficult to meet the requirements. Therefore, the direct current signal monitoring is very important.
In the prior art, for trains with a device for monitoring a direct current circuit, because the number of electric components of a railway passenger vehicle is large, the direct current circuit is complex, and has a very important influence on the driving safety, the direct current circuit often adopts a mode of connecting auxiliary contacts in parallel to monitor the running state of the circuit, and the method does not directly monitor the running state of the circuit, can not accurately and objectively reflect the running state of the vehicle, and is not beneficial to the safe running of the vehicle. In addition, for the train without the device for monitoring the direct current circuit, the fault location of the direct current circuit takes longer time, the maintenance is inconvenient, the utilization rate of the vehicle is low, and the maintainability is poor; meanwhile, a feedback mechanism is lacked, circuit faults cannot be processed in time, and reliability is low; and the system also lacks a real-time monitoring function and cannot master the running state of the vehicle.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a dc circuit monitoring system for a railway passenger vehicle, comprising: the data acquisition module is connected with a detected direct current signal in each direct current control loop of the railway passenger vehicle to acquire the current of the detected direct current signal, and the corresponding direct current acquisition signal is obtained after the self-oscillation, conditioning and filtering actions are carried out; the data processing and diagnosis module is connected with each data acquisition module, acquires the direct current acquisition signals sent by each data acquisition module, respectively judges the abnormity of the direct current acquisition signals, and outputs corresponding diagnosis information according to the judgment result; and the information display module is connected with the data processing and diagnosis module, acquires and analyzes the diagnosis information, displays the detection current value for monitoring each path of the detected direct current signal in real time based on the analysis result, and starts an alarm indicating device under the abnormal condition.
Preferably, each of the data acquisition modules comprises: the open type current transformer is arranged around a tested direct current signal cable and used for detecting a magnetic field around the tested direct current signal cable, and identifying the magnitude and direction of the current according to the magnetic field intensity to obtain the current of the tested direct current signal; the self-excited oscillator is connected with the open type current transformer and is used for coupling the directly acquired direct current signal to be measured with a self-excited oscillation square wave circuit and outputting a corresponding square wave oscillation signal; the active gain filter is connected with the self-excited oscillator and used for amplifying the square wave oscillation signals carrying the acquired signals and filtering the oscillation signals; the amplifier is connected with the active gain filter and used for amplifying and conditioning the output signal of the active gain filter to obtain a gradual change signal matched with a preset signal requirement; and the second filter is connected with the amplifier and is used for further carrying out secondary filtering processing on the gradient signal to obtain the smooth direct current acquisition signal.
Preferably, the data processing and diagnosis module comprises: the FPGA unit is connected with each data acquisition module, receives and reads all the direct current acquisition signals, converts the read results into direct current read data corresponding to the direct current acquisition signals, and transmits the direct current read data to the processor; and the processor acquires each direct current read data, determines a signal channel of a corresponding loop of the direct current read data, and performs abnormality judgment on each direct current read data based on a preset detection range aiming at different signal channels.
Preferably, the processor includes a data processing front buffer that receives the dc read data, buffers the dc read data according to different signal channels and a receiving order of each path of signal, and outputs the dc read data of the path of signal received first according to an analysis completion flag signal for the different signal channels; and the data processing area is used for receiving the direct current reading data sent by the data processing front-end buffer area, judging whether each direct current reading data is abnormal data or not, and outputting the diagnosis information and the analysis completion flag signal aiming at each signal channel according to a judgment result.
Preferably, the data processing area further integrates the current dc read data with a timestamp when it is determined that the dc read data is non-abnormal data, obtains first diagnostic information for a current signal channel, and outputs the first diagnostic information to the first storage area at a preset time interval.
Preferably, the data processing area further determines a corresponding signal channel when the dc read data is determined to be abnormal data, retrieves all the first diagnostic information before the abnormality of the channel from the first storage area, integrates the information with the current abnormal dc read data to obtain the second diagnostic information of the signal channel to which the current abnormal data belongs, and further generates fault data and an effective abnormal flag instruction.
Preferably, the data processing area detects the second diagnostic information to obtain a fault code representing a state of a dc control loop in which the current abnormal data is located, and generates the corresponding fault data by combining the second diagnostic information corresponding to the current abnormal data.
Preferably, the processor further comprises: the first storage area is used for storing the first diagnostic information so as to take the information in the area as a data basis for monitoring the detected direct current signal in real time; and the second storage area is used for storing the second diagnostic information so as to use the information in the area as a data basis for monitoring the detected direct current signal in real time.
Preferably, the data processing and diagnosis module further comprises: an F-RAM unit receiving and storing the fault data of all signal channels; and the GPIO unit is used for acquiring and detecting the abnormal mark instructions of all the signal channels, converting the acquired abnormal mark instructions into fault alarm driving signals, and responding and outputting the fault alarm driving signals.
Preferably, the information display module displays the first diagnostic information or the fault data for each channel in real time.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the invention solves the problems of low safety, poor maintainability, low reliability and the like of the existing vehicle, realizes the functions of real-time monitoring, state evaluation, fault diagnosis, man-machine interaction and the like of the direct current signal of the passenger vehicle, and effectively improves the driving safety and the stability of the vehicle.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a direct current circuit monitoring system for a railway passenger vehicle according to an embodiment of the application.
Fig. 2 is a schematic composition diagram of a data acquisition module 11 in the dc circuit monitoring system for the railway passenger vehicle according to the embodiment of the present application.
Fig. 3 is a schematic structural diagram of the data processing and diagnosing module 12 in the dc circuit monitoring system for the railway passenger vehicle according to the embodiment of the present application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In order to solve the problem that the railway passenger vehicle lacks direct-current signal monitoring, the embodiment of the invention provides a system for detecting the direct-current signals of the railway passenger vehicle based on a customized open type current transformer to carry out real-time monitoring, which can feed back fault information in real time, accurately position the fault, safely and effectively monitor all direct-current circuits from a tiny control signal to a power signal, and improve the safety and reliability of train operation.
Fig. 1 is a schematic structural diagram of a direct current circuit monitoring system for a railway passenger vehicle according to an embodiment of the application. As shown in fig. 1, the system includes a data acquisition module 11, a data processing and diagnosis module 12, and an information display module 13. The data acquisition module 11 is connected with the output end of a detected direct current signal in each direct current control loop of the railway passenger vehicle through an open current transformer to acquire the current of the detected direct current signal, and after the self-oscillation, conditioning and filtering actions, a corresponding direct current acquisition signal is acquired; the data processing and diagnosing module 12 is connected with each data acquisition module, acquires the direct current acquisition signals sent by each data acquisition module, respectively performs abnormity judgment on the direct current acquisition signals, and outputs corresponding diagnostic information according to the judgment result; and the information display module 13 is connected with the data processing and diagnosis module, acquires and analyzes the diagnosis information, displays the detection current value for monitoring each path of detected direct current signals in real time based on the analysis result, and starts an alarm indicating device under the abnormal condition. It should be noted that, in this embodiment, one or several detected dc signals of the dc control loops in the railway passenger vehicle can be detected, and each detected dc signal is equipped with a data acquisition module 11 for the signal, so that the dc circuit monitoring system is provided with at least one data acquisition module 11.
Specifically, the constituent components of the system and their functions are explained one by one below.
Fig. 2 is a schematic composition diagram of a data acquisition module 11 in the dc circuit monitoring system for the railway passenger vehicle according to the embodiment of the present application. As shown in fig. 2, the module 11 includes: the circuit comprises an open type current transformer, a self-excited oscillator, an active gain filter, an amplifier and a second filter.
Specifically, the following is explained in detail with respect to each component in each data acquisition module 11:
the open type current transformer is arranged around the tested direct current signal cable, and the current magnitude and direction are identified according to the magnetic field intensity by detecting the magnetic field around the tested direct current signal cable, so that the current of the tested direct current signal is obtained, and the detection of the current of the tested direct current signal is completed. Specifically, in this example, when the open-type current transformer detects a magnetic field direction that is the same as the set standard direction, a positive current with a corresponding amplitude value may be output; if a magnetic field direction opposite to the set standard direction is detected, a negative current with a corresponding amplitude is output. A direct current bias magnetic field is placed in an iron core excited by an alternating symmetrical current source, at the moment, the symmetry of alternating magnetic flux in the iron core is destroyed, the phases of positive and negative half-waves of a magnetic flux waveform are changed, and correspondingly, the positive and negative half-waves in the output voltage of a detection winding are relatively displaced. The magnitude and the direction of the phase variation of the positive half-wave and the negative half-wave can reflect the magnitude and the direction of the direct current bias current, and the direct current is measured by utilizing the characteristic, so that the direct current can be measured by utilizing a phase difference magnetic modulation technology. Furthermore, the open type current transformer is adopted to measure the current of the direct current signal to be measured, and the mode is more convenient for installation, test and maintenance compared with the common transformer. It should be noted that, in this example, a current transformer similar to that in the present application may also be used to detect the dc signal to be detected, which is not specifically limited in the present application, and a person skilled in the art may select the type of the device to be detected according to actual situations.
And the self-excited oscillator is connected with the open type current transformer, couples the collected micro direct current signal to be detected into a self-excited oscillation square wave circuit, outputs a corresponding square wave oscillation signal, is favorable for the transmission of the square wave oscillation signal and prevents an input signal from being submerged by an interference signal. The self-excited oscillation has the function of coupling a magnetic field signal generated by the detected direct current into an oscillation waveform, and because the change amplitude generated by the original current signal is small, the signal generated by the direct current can be extracted by the oscillation waveform coupling and then the amplification, filtering and other processing are carried out, and then the subsequent data processing and analysis are carried out.
And the active gain filter is connected with the self-excited oscillator, amplifies the square wave oscillation signal carrying the acquired signal, filters the oscillation signal, only keeps the amplified sampling signal, improves the signal-to-noise ratio of the input signal, and optimizes the square wave oscillation signal.
And the amplifier is connected with the active gain filter and used for amplifying and conditioning the output signal of the active gain filter to obtain a gradual change signal matched with the preset signal requirement.
And the second filter is connected with the amplifier, and further performs secondary filtering processing on the gradient signal acquired from the amplifier to obtain a smooth direct-current acquisition signal. It should be noted that the present application is not limited to the type of the second filter, and those skilled in the art can select the type of the second filter in a practical application process on the basis of meeting the functional objective.
It should be noted that, referring to fig. 2, in the embodiment of the present application, since the dc acquisition signal output by the data acquisition module 11 can be used in any one of the back-end circuit of the dc voltage output (for example, the voltage requirement is-2.5 to 2.5V), the U/I conversion circuit (for example, the current requirement is-25 to 25mA) or the digital quantity of the a/D conversion circuit, the data acquisition module 11 can obtain the signal requirement information about the circuit to which the dc signal to be measured is to be output from the back-end circuit. Furthermore, the current transformer can determine and identify the magnitude of the output current based on the magnetic field intensity, and the amplifier can determine the amplification factor of the output signal based on the current signal demand information, so that a gradual change signal matched with the signal demand is obtained.
After the measured dc signal is collected by the data collection module 11, the obtained dc collected signal can be transmitted to the data processing and diagnosis module 12. Since the data processing and diagnosing module 12 is connected to each data collecting module 11, the module 12 can determine the signal (type) channel corresponding to the collecting module number according to the different connection point numbers of the data collecting module 11 connected with the module, and perform diagnostic analysis processing on each direct current collecting signal according to the type of the direct current collecting signal. The data processing and diagnosing module 12 has the same diagnosing method for each kind of received dc collected signals.
Fig. 3 is a schematic structural diagram of the data processing and diagnosing module 12 in the dc circuit monitoring system for the railway passenger vehicle according to the embodiment of the present application. As shown in fig. 3, the module 12 includes an FPGA unit 121 and a processor 122.
Specifically, first, the FPGA unit 121 is explained. And the FPGA unit is connected with the data acquisition modules 11, receives and reads all the direct current acquisition signals, digitalizes the read results, converts the direct current acquisition signals into direct current read data corresponding to the direct current acquisition signals, and transmits the direct current read data to the processor 122. Specifically, the FPGA unit 121 is connected to the second filter of each data acquisition module 11, receives all the dc acquisition signals for different signal (kind) channels, sends the dc acquisition signals to the FPGA unit 121 through the SPI interface, and reads by using the SPI communication protocol, so that the read result is matched with the data content of the dc acquisition signals of the same (kind) channel, and the read result is transmitted to the processor 122 as the dc read data. It should be noted that, in an embodiment, the FPGA unit 121 includes a plurality of reading regions, and each reading region is connected to one data acquisition module 11 to read a direct current acquisition signal of a corresponding (kind) channel. Each reading area can identify a channel (type) of a direct current acquisition signal according to signal input from different pin points, mark the channel (type), and integrate channel mark information and information such as a reading result of the signal (namely, a detected direct current signal detection value) to obtain direct current reading data aiming at the type of the detected direct current signal. In addition, in this example, the transmission of the direct current acquisition signal to the FPGA unit 121 by using the SPI device is a specific example of the present application, and the present application is not particularly limited to this, and other transmission methods may also be adopted to transmit the signal to the FPGA unit 121.
Next, the processor 122 will be described in detail. The unit 122 is connected to the FPGA unit 121, acquires each dc read data corresponding to the dc acquisition signal, determines a (type) channel of a corresponding loop of each dc read signal, and performs an abnormality determination on the current dc read data based on a preset detection range for each signal (type) channel (the detection range of each channel is set according to a requirement of the detection range of the detected dc signal in the dc control loop in which each dc read signal is located), so as to output corresponding diagnostic information. Further, the structure and function of the processor 122 will be described in detail below. Referring to fig. 3, the processor 122 includes a data processing front-end buffer 1221, a data processing section 1222, a first memory section 1223, a second memory section 1224, an F-RAM unit 1225, and a GPIO unit 1226, etc. It should be noted that the present application may also process data through other processors or control systems, and the present application is not limited to this.
First, the data processing front buffer 1221 will be explained. And the data processing front-end buffer 1221 is configured to receive the dc read data of all channels sent by the FPGA unit 121, and perform buffering and sending according to different signal channels and a receiving sequence of each channel of signals. Specifically, in the present embodiment, when a valid analysis completion flag signal for the same signal (type) channel is detected, the dc read data received first for the same signal (type) channel is sent to the data processing area 1222, and further, a new dc read data is continuously received. It should be noted that, when the data processing front-end buffer 1221 does not receive a valid analysis completion flag signal, several pieces of dc read data that have been sent in this area are buffered according to different signal channels (pin point numbers).
The data processing area 1222 receives and analyzes the dc read data sent by the data processing front buffer 1221, obtains the channel tag information and the read result of the signal (i.e., the dc read data), determines whether the dc read data is abnormal data, outputs corresponding diagnostic information according to the determination result, and sends an effective analysis completion flag signal. It should be noted that when the dc read data completes the anomaly determination and outputs the diagnosis information, an effective analysis completion flag signal for the current abnormal data channel is sent to the data processing front-end buffer 1221, so as to analyze the received dc read data for the next channel of the same type.
Specifically, the data processing area 1222 has a defined range of acceptable detection values for each signal (type) channel, and if the detection value in the current dc read data exceeds a preset detection range for the signal (type) channel, it determines that the detection value of the data is abnormal data; otherwise, the data is non-abnormal data. Further, when it is determined that the dc read data is not abnormal data, the current dc read data is integrated with the time stamp to obtain first diagnostic information for the signal (type) channel, and the first diagnostic information is output at preset time intervals (at a certain output frequency) and stored in the first storage area 1223 (in this example, the first storage area 1223 is integrated in the external NAND FLASH). At the same time, the data processing area 1222 generates a valid analysis completion flag signal for the channel to which the current abnormal data belongs, and sends it to the data processing front-end buffer 1221. If the output frequency is not higher than the output frequency, the current direct current read data which is judged to be non-abnormal data is cleared. In this example, the setting of the time interval is not particularly limited, and those skilled in the art can set the time interval according to factors such as the current train operation mode and the system accuracy requirement.
In addition, when the data processing area 1222 determines that the current dc read data is abnormal data, a signal (type) channel corresponding to the current abnormal data is determined, all the first diagnostic information before the abnormality of the channel occurs is retrieved from the first storage area 1223, and at the same time, the information is integrated with the current abnormal dc read data to obtain the second diagnostic information of the signal channel to which the current abnormal data belongs, and further, the fault data and the valid abnormal flag command for the current abnormal data are generated. Meanwhile, the data processing area 1222 generates a valid analysis completion flag signal for the channel to which the current abnormal data belongs, and sends the flag signal to the data processing front-end buffer 1221. The data processing block 1222 detects the second diagnostic information, obtains a fault code (described below) representing the state of the dc control loop in which the current abnormal data is located, and generates corresponding fault data in combination with the second diagnostic information corresponding to the current abnormal data.
Further, in this example, the processor 122 is further provided with an NAND FLASH unit (not shown), wherein the NANDFLASH unit further includes a first storage area 1223 and a second storage area 1224. It should be noted that, in practical applications, the first storage area 1223 and the second storage area 1224 may also be stored by using SDRAM, and the type of the storage devices used in these two areas is not specifically limited in this application, and those skilled in the art can select the storage device according to practical applications.
Then, the explanation of the first storage area 1223 and the second storage area 1224 is continued. The first storage area 1223 receives and stores the first diagnostic information sent by the data processing area 1222, and since the area stores the diagnostic information for non-abnormal data, the information in the area is used as the data basis for monitoring the detected value of the detected dc signal in real time. The second storage area 1224 receives and stores the second diagnostic information, and the information in the area can be used as a data basis for historical fault query, and can also monitor the data basis of the detected direct current signal in real time, so as to achieve the purpose of displaying fault data.
In addition, the processor 122 is also provided with an F-RAM unit 1225 and a GPIO unit 1226. The F-RAM is a low-power-consumption and non-volatile memory, and when the power supply is turned off or interrupted, the internal data is stored by using the internal PZT crystal, so that the data writing speed is high, the endurance is high, and the service life is long. In this example, the F-RAM unit 1225 receives and stores fault data for all channels, and bases the information in the unit 1225 as data for historical fault information queries. Specifically, the fault data includes information such as second diagnostic information generated when an abnormality occurs, current abnormality data, and a fault code. The processor 122 is preset with a fault code generation mechanism, which is set comprehensively based on the standard reference values of the test points in the dc control loop where the detected dc signal is located, and generates a code representing the current loop state according to the loop state data received in real time, so that when an abnormality occurs, a fault code representing the state of the dc control loop where the current abnormal data is located can be generated, thereby obtaining corresponding fault data, and when the fault data is displayed by the information display module 13, a worker can immediately know the state of the dc control loop where the current fault occurs.
The GPIO is a general purpose programmable I/O port used to control simple-structured external devices or circuits (for example, many devices/circuits require only two states of on/off), and the data input or output by the GPIO port configuration is streamed via programmable logic. In this example, the GPIO unit 1226 is configured to obtain and detect the above-mentioned abnormal flag instruction for each channel signal (type), perform digital-to-analog conversion on the instruction, convert the instruction into a fault alarm driving signal, and perform response output, so as to start an external alarm indication device connected to the GPIO unit 1226, and perform a fault state indication function. When any channel fails (i.e., when the GPIO unit 1226 detects a valid abnormal flag command for each channel signal), the GPIO unit 1226 drives an alarm indication device (e.g., an indicator light) to display a fault state, which indicates that there is a channel data fault.
Finally, referring again to fig. 3, the information display module 13 will be explained. The information display module 13 has an alarm indicating device, is connected to the processor 122, and mainly implements human-computer interaction, and completes functions of displaying a detected current value of a detected dc signal, performing fault alarm, performing historical fault information query, and the like. The information display module 13 is configured to display the first diagnostic information or the fault data for each channel in real time. Specifically, in the practical application process, firstly, the module 13 displays the detected current values of the detected dc signals for different signal (type) channels in real time by receiving and analyzing the first diagnostic information sent by the first storage area 1223 in real time. Secondly, the information display module 13 receives and detects the fault alarm driving signal, and when the signal state is detected to be effective, an alarm indicating device is started to prompt an operator to perform subsequent measures such as fault inquiry, fault analysis and parking operation. In addition, after the operator inputs the fault query range information through the information display module 13, the information display module 13 may retrieve the query result matched with the fault query range from the F-RAM unit 1225, analyze the corresponding fault data, and display the analysis result including the abnormal data (current detection value), the channel to which the abnormal data belongs, all the first diagnostic information and the fault code in the channel before the abnormality occurs, which is beneficial to comprehensively determining the cause of the fault occurrence and performing more accurate fault location. It should be noted that, in this embodiment, after the query result is obtained, not only the current abnormal data can be obtained, but also the data of the change trend of the detection value before the abnormality occurs can be queried, which is more beneficial for an operator to comprehensively analyze the cause of the fault, so as to implement more accurate measures.
In this example, the processor 122 can perform parallel diagnostic analysis processing on a plurality of measured dc signals sent from each data acquisition module at the same time, and the same processing method is adopted for each signal type of the measured dc signal, and the specific structure of the processor 122 is not limited in this application. For example, the processor 122 may be divided into a plurality of diagnostic processing channels, each of which has a data processing front-end buffer, a data processing area, a first/second storage area, and the like corresponding thereto, and each of which processes only one signal type of the dc signal to be detected and sequentially performs processing such as abnormality detection, fault state determination, storage, and the like on the currently acquired dc read signal in the order of reception.
Specifically, in this embodiment, the data processing front buffer in each diagnostic processing channel is configured to receive the dc read data for the current channel, buffer the dc read data according to the receiving sequence of the signals of the current signal channel and the corresponding loop, and output the dc read data of the path of signals received first according to the analysis completion flag signal for the current signal channel. And the data processing area in each diagnosis processing channel is used for receiving the direct current read data sent by the data processing front-end buffer area in the same channel, judging whether the current direct current read data is abnormal data or not, outputting diagnosis information and an analysis completion flag signal aiming at the current signal channel according to a judgment result, and further sending the analysis completion flag signal to the data processing front-end buffer area in the same channel. The data processing area further integrates the current direct current reading data and the time stamp when the current direct current reading data are judged to be non-abnormal data, so that first diagnosis information aiming at the current signal channel is obtained, and the first diagnosis information is output to a first storage area in the same channel according to a preset time interval; when the current direct current reading data is judged to be abnormal data, a corresponding signal channel is determined, all first diagnosis information before the abnormality of the channel is generated is called from a first storage area in the same channel, the information and the current abnormal direct current reading data are integrated to obtain second diagnosis information for the current channel, and fault data and an effective abnormal mark instruction are further generated. In addition, the first storage area in each diagnostic processing channel is used for storing the first diagnostic information of the current channel so as to use the information in the area as the data basis for monitoring the detected direct current signal in real time. And the second storage area in each diagnostic processing channel is used for storing second diagnostic information in the current channel so as to use the information in the area as a data basis for monitoring the detected direct current signal in real time.
In conclusion, the invention realizes the monitoring of the full working condition state from micro control direct current signals to power direct current signals, monitors the working state of the direct current circuit through the phase difference magnetic modulation technology, realizes the real-time monitoring of the direct current circuit signals, is easy to maintain, does not influence the vehicle function because of monitoring equipment, and ensures the safe driving of the vehicle; the vehicle system fault detection and alarm system has a fault detection and alarm mechanism, and a driver can perform corresponding operation according to fault prompt, so that the fault rate of the vehicle system is reduced to a great extent; meanwhile, the device is convenient to install, is easy to access into a vehicle electrical system, can be applied to electrical vehicles of various rail transit vehicles such as motor cars, subways and intercity railways, and is wide in application range.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A dc circuit monitoring system for a railway passenger vehicle, the system comprising:
the data acquisition module is connected with a detected direct current signal in each direct current control loop of the railway passenger vehicle to acquire the current of the detected direct current signal, and the corresponding direct current acquisition signal is obtained after the self-oscillation, conditioning and filtering actions are carried out;
the data processing and diagnosis module is connected with each data acquisition module, acquires the direct current acquisition signals sent by each data acquisition module, respectively judges the abnormity of the direct current acquisition signals, and outputs corresponding diagnosis information according to the judgment result;
and the information display module is connected with the data processing and diagnosis module, acquires and analyzes the diagnosis information, displays the detection current value for monitoring each path of the detected direct current signal in real time based on the analysis result, and starts an alarm indicating device under the abnormal condition.
2. The monitoring system of claim 1, wherein each of the data acquisition modules comprises:
the open type current transformer is arranged around a tested direct current signal cable and used for detecting a magnetic field around the tested direct current signal cable, and identifying the magnitude and direction of the current according to the magnetic field intensity to obtain the current of the tested direct current signal;
the self-excited oscillator is connected with the open type current transformer and is used for coupling the directly acquired direct current signal to be measured with a self-excited oscillation square wave circuit and outputting a corresponding square wave oscillation signal;
the active gain filter is connected with the self-excited oscillator and used for amplifying the square wave oscillation signals carrying the acquired signals and filtering the oscillation signals;
the amplifier is connected with the active gain filter and used for amplifying and conditioning the output signal of the active gain filter to obtain a gradual change signal matched with a preset signal requirement;
and the second filter is connected with the amplifier and is used for further carrying out secondary filtering processing on the gradient signal to obtain the smooth direct current acquisition signal.
3. The monitoring system of claim 1 or 2, wherein the data processing and diagnostic module comprises:
the FPGA unit is connected with each data acquisition module, receives and reads all the direct current acquisition signals, converts the read results into direct current read data corresponding to the direct current acquisition signals, and transmits the direct current read data to the processor;
and the processor acquires each direct current read data, determines a signal channel of a corresponding loop of the direct current read data, and performs abnormality judgment on each direct current read data based on a preset detection range aiming at different signal channels.
4. The monitoring system of claim 3, wherein the processor comprises,
a data processing front-end buffer area which receives the direct current read data, caches the direct current read data according to different signal channels and the receiving sequence of each path of signals, and outputs the direct current read data of the path of signals received firstly according to the analysis completion mark signals aiming at different signal channels;
and the data processing area is used for receiving the direct current reading data sent by the data processing front-end buffer area, judging whether each direct current reading data is abnormal data or not, and outputting the diagnosis information and the analysis completion flag signal aiming at each signal channel according to a judgment result.
5. The monitoring system of claim 4,
and the data processing area is used for integrating the current direct current reading data with a time stamp to obtain first diagnosis information aiming at the current signal channel and outputting the first diagnosis information to a first storage area according to a preset time interval when the direct current reading data are judged to be non-abnormal data.
6. The monitoring system of claim 5, wherein the data processing zone,
and further determining a corresponding signal channel when the direct current read data is judged to be abnormal data, calling all the first diagnosis information before the abnormality of the channel from the first storage area, integrating the information with the current abnormal direct current read data to obtain second diagnosis information of the signal channel to which the current abnormal data belongs, and further generating fault data and an effective abnormal mark instruction.
7. The monitoring system of claim 6, wherein the data processing section detects the second diagnostic information, obtains a fault code representing a state of the dc control loop in which the current abnormal data is located, and generates the corresponding fault data in combination with the second diagnostic information corresponding to the current abnormal data.
8. The monitoring system of claim 6 or 7, wherein the processor further comprises:
the first storage area is used for storing the first diagnostic information so as to take the information in the area as a data basis for monitoring the detected direct current signal in real time;
and the second storage area is used for storing the second diagnostic information so as to use the information in the area as a data basis for monitoring the detected direct current signal in real time.
9. The monitoring system of any one of claims 6-8, wherein the data processing and diagnostic module further comprises:
an F-RAM unit receiving and storing the fault data of all signal channels;
and the GPIO unit is used for acquiring and detecting the abnormal mark instructions of all the signal channels, converting the acquired abnormal mark instructions into fault alarm driving signals, and responding and outputting the fault alarm driving signals.
10. The monitoring system of any one of claims 6 to 9, wherein the information display module displays the first diagnostic information or the fault data for each channel in real time.
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