CN112977547B - Detection circuit - Google Patents
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- CN112977547B CN112977547B CN201911288624.7A CN201911288624A CN112977547B CN 112977547 B CN112977547 B CN 112977547B CN 201911288624 A CN201911288624 A CN 201911288624A CN 112977547 B CN112977547 B CN 112977547B
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- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 238000012545 processing Methods 0.000 claims abstract description 47
- 238000001914 filtration Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000002955 isolation Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000004364 calculation method Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
- B61L25/021—Measuring and recording of train speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
- B61L25/023—Determination of driving direction of vehicle or train
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The detection circuit provided by the invention is applied to the technical field of rail trains, and comprises a first speed sensor, a second speed sensor, a signal acquisition module and a first processing module, wherein the phase of a first pulse signal fed back by the first speed sensor is different from the phase of a second pulse signal fed back by the second speed sensor by a first preset angle, under the condition that a rail vehicle runs forwards, the deviation between the phase difference of the first pulse signal and the second pulse signal and the set first preset angle is in a preset angle range.
Description
Technical Field
The invention belongs to the technical field of railway vehicles, and particularly relates to a detection circuit.
Background
The speed detection circuit is an extremely important component part in the automatic protection system of the rail train, and in the existing design, the speed detection circuit is used for feeding back the running speed of the rail train to the automatic protection system and providing basic data support for the automatic protection system to execute the protection control function.
However, with the continuous expansion of the functions of the automatic protection system, the automatic protection system often needs to acquire the running speed and the running direction of the rail train at the same time, and the existing speed detection circuit has difficulty in meeting the requirements of practical application. Therefore, how to provide a detection circuit, which can detect the running speed and the running direction of the rail train at the same time, meets the actual application requirements, and is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a detection circuit capable of feeding back the running speed and the running direction of a rail train at the same time, so as to meet the actual application requirements, and the specific scheme is as follows:
the present invention provides a detection circuit, comprising: a first speed sensor, a second speed sensor, a signal acquisition module, and a first processing module, wherein,
the phase difference of pulse signals fed back by the first speed sensor and the second speed sensor at the same moment is a first preset angle;
the signal acquisition module is used for receiving a first pulse signal fed back by the first speed sensor, converting the first pulse signal into a first digital signal, receiving a second pulse signal fed back by the second speed sensor, and converting the second pulse signal into a second digital signal;
the first processing module is used for calculating the phase difference between the first digital signal and the second digital signal to obtain a first phase difference, determining that the rail train runs forwards under the condition that the deviation between the first phase difference and the first preset angle is in the preset angle range,
and calculating the running speed of the rail train according to the first digital signal or the second digital signal to obtain a first speed value.
Optionally, the detection circuit provided by the present invention further includes: a third speed sensor and an analysis module, wherein,
the measurement principle of the third speed sensor is different from the measurement principle of the first speed sensor and the second speed sensor;
the signal acquisition module is also used for receiving a third pulse signal fed back by the third speed sensor and converting the third pulse signal into a third digital signal;
the first processing module is also used for calculating the running speed of the rail train according to the third digital signal to obtain a second speed value;
the analysis module is used for calculating the difference value of the first speed value and the second speed value to obtain a first difference value, and sending first alarm information when the first difference value is not in a preset speed range.
Optionally, the signal acquisition module includes a plurality of signal acquisition circuits, and the number of the signal acquisition circuits is not less than the number of the speed sensors connected with the signal acquisition module;
the signal acquisition circuit includes: the filter isolation circuit and the first digital optocoupler, wherein,
the filtering isolation circuit is used for receiving the pulse signals of the corresponding speed sensor and filtering the pulse signals to obtain filtered pulse signals;
the first digital optocoupler is configured to convert the filtered pulse signal into a digital signal.
Optionally, the signal acquisition circuit further includes: a second digital optocoupler, wherein,
the second digital optocoupler is connected with the filtering isolation circuit and is used for converting the filtered pulse signal into a digital signal and inverting the digital signal to obtain an inverted digital signal;
and under the condition that the signal acquisition circuit comprises the second digital optocoupler, the signal acquisition module is further used for converting the first pulse signal into a inverted first digital signal, converting the second pulse signal into an inverted second digital signal and converting the third pulse signal into an inverted third digital signal.
Optionally, the detection circuit provided by the present invention further includes: a second processing module, wherein,
the second processing module is used for calculating the phase difference between the inverted first digital signal and the inverted second digital signal to obtain a second phase difference, and determining that the rail train runs forwards under the condition that the deviation between the second phase difference and a second preset angle is in the preset angle range, wherein the sum of the second preset angle and the first preset angle is 360 degrees;
the method comprises the steps of,
calculating the running speed of the rail train according to the inverted first digital signal or the inverted second digital signal to obtain a third speed value;
the method comprises the steps of,
and calculating the running speed of the rail train according to the inverted third digital signal to obtain a fourth speed value.
Optionally, the analysis module is further configured to calculate a difference between the third speed value and the fourth speed value, obtain a second difference, and send the first alarm information when the second difference is not in the preset speed range.
Optionally, the analysis module is further configured to send a second alarm message when the running direction of the rail train fed back by the first processing module is inconsistent with the running direction of the rail train fed back by the second processing module.
Optionally, the detection circuit provided by the invention further comprises a power module, wherein the power module supplies power to each speed sensor.
Optionally, the power module is provided with a monitoring circuit for monitoring the stability of the power supply.
Optionally, a differential mode filter circuit and a common mode filter circuit are further arranged between the power module and each speed sensor.
Based on the technical scheme, the detection circuit provided by the invention has the advantages that the phase difference between the phase of the first pulse signal fed back by the first speed sensor and the phase of the second pulse signal fed back by the second speed sensor is different by a first preset angle, under the condition that a railway vehicle runs forwards, the deviation between the phase difference between the first pulse signal and the second pulse signal and the set first preset angle is in a preset angle range, and the detection circuit provided by the invention compares the first phase difference detected in real time with the first preset angle, so that the running direction of the train is judged, and meanwhile, the running speed of the railway train can be calculated according to the first digital signal or the second digital signal, namely, the running speed and the running direction of the railway train can be fed back simultaneously, and the actual application requirement is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a first detection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a second detection circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram of a third detection circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of a fourth detection circuit according to an embodiment of the present invention;
fig. 5 is a block diagram of a fifth detection circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a block diagram of a first detection circuit according to an embodiment of the present invention, where the detection circuit according to the embodiment of the present invention includes: a first speed sensor 10, a second speed sensor 20, a signal acquisition module 30, and a first processing module 40, wherein,
based on the working principle of the speed sensor in the prior art, the phase difference of the pulse signals fed back between the speed sensors can be set, and before the detection circuit provided by the embodiment of the invention is applied to a specific rail train, the phase difference of the pulse signals fed back by the first speed sensor 10 and the second speed sensor 20 is set, so that the phase difference of the pulse signals fed back by the first speed sensor 10 and the second speed sensor 20 at the same time is a first preset angle. The setting process of the feedback pulse signal of the speed sensor can be performed by referring to the setting mode in the prior art, and the specific setting of the speed sensor is not limited in the invention.
The pulse signal output ends of the first speed sensor 10 and the second speed sensor 20 are respectively connected with the signal sampling module 30, the first speed sensor 10 sends a first pulse signal to the signal acquisition module 30, and the second speed sensor 20 sends a second pulse signal to the signal acquisition module 30.
The signal acquisition module 30 receives a first pulse signal fed back by the first speed sensor 10 and converts the obtained first pulse signal into a first digital signal; meanwhile, the signal acquisition module 30 also receives a second pulse signal fed back by the second speed sensor 20 and converts the second pulse signal into a second digital signal. After obtaining the first digital signal and the second digital signal, the signal acquisition module 30 sends both the first digital signal and the second digital signal to the first processing module 40.
After receiving the first digital signal and the second digital signal, the first processing module 40 calculates a phase difference between the first digital signal and the second digital signal, so as to obtain a first phase difference. If the rail train is traveling forward, the first phase difference and the first preset angle should be consistent, and the deviation between the first phase difference and the first preset angle should be zero, but considering that different sensors may have deviations in the process of feeding back the pulse signal and in the process of converting the pulse signal into a digital signal, a preset angle range can be set, and the rail train can be determined to travel forward under the condition that the deviation between the first phase difference of the rail train and the first preset angle, which is actually measured, is within the preset angle range; correspondingly, if the rail train is backing, the deviation between the obtained first phase difference and the first preset angle is large and is not in the preset angle range, and under the condition, the rail train can be judged to be running backwards.
Further, the first processing module 40 may further calculate the running speed of the rail train according to the first digital signal corresponding to the first speed sensor or the second digital signal corresponding to the second speed sensor 20, to obtain the first speed value.
In the embodiment of the invention, the running direction of the rail train is judged by using the phase difference between the preset feedback pulse signals of the first speed sensor and the second speed sensor, and the consistency of the first speed sensor and the second speed sensor directly influences the accuracy of the judging result, so that the first speed sensor and the second speed sensor are preferably speed sensors with the same model and the same measuring principle. Of course, on the premise of ensuring that the first phase difference and the first preset angle meet the basic directions of the judging principle, the first speed sensor and the second speed sensor can also select different types of speed sensors, and the speed sensors also belong to the scope of protection of the invention under the premise of not exceeding the scope of the core idea of the invention.
The process of calculating the running speed of the rail train according to the pulse signal fed back by the speed sensor can be realized by referring to the calculation method in the prior art, and the method for calculating the running speed of the rail train is not limited.
In summary, by comparing the first phase difference detected in real time with the first preset angle, the detection circuit provided by the embodiment of the invention can judge the running direction of the train, and meanwhile, the running speed of the rail train can be calculated according to the first digital signal or the second digital signal, so that the functions can be realized more abundantly, and the running speed and the running direction of the rail train can be fed back at the same time, thereby meeting the actual application requirements.
Optionally, referring to fig. 2, fig. 2 is a schematic diagram showing a second detection circuit according to an embodiment of the present invention, where, based on the embodiment shown in fig. 1, the detection circuit according to the embodiment of the present invention further includes: a third speed sensor 50 and an analysis module 60, wherein,
the pulse signal output end of the third speed sensor 50 is also connected with the signal acquisition module 30, and sends a third pulse signal to the signal acquisition module 30, and the signal acquisition module 30 receives the third pulse signal fed back by the third speed sensor 50 and converts the obtained third pulse signal into a third digital signal.
The first processing module 40 receives the third digital signal sent by the signal acquisition module 30, and calculates the running speed of the rail train according to the obtained third digital signal, so as to obtain a second speed value. In the embodiment of the present invention, the first processing module 40 may calculate a first speed value according to the first digital signal or the second digital signal, and calculate a second speed value according to the third digital signal. After obtaining the first and second speed values, the first processing module 40 sends the obtained first and second speed values to the analysis module 60.
After obtaining the first speed value and the second speed value, the analysis module 60 calculates a difference value between the first speed value and the second speed value, obtains a first difference value, and sends first alarm information if the first difference value is not within a preset speed range.
In the embodiment of the present invention, the measurement principle of the third speed sensor 50 is different from the measurement principle of the first speed sensor 10 and the second speed sensor 20, so that the pulse signal fed back by the third speed sensor 50 can be used as a reference to compare with the pulse signal fed back by the first speed sensor 10 or the second speed sensor 20, and under normal conditions, no matter which type of speed sensor is used, the finally calculated running speed of the rail train should be close, so that if the first difference value corresponding to the first speed value and the second speed value is not within the preset speed range, it is indicated that the related circuit fails, and the analysis module 60 sends the first alarm information to remind the train driver of the fault.
It is conceivable that the measurement principle of the third speed sensor 50 is defined differently from the measurement principle of the first speed sensor 10 and the second speed sensor in the embodiment of the present invention, mainly to improve the effectiveness of the comparison result.
In summary, the detection circuit provided by the embodiment of the present invention may further determine the calculated running speed of the train based on the foregoing embodiment, and send the first alarm information when the calculated running speed does not meet the foregoing preset requirement, so that the reliability of the automatic protection system of the rail train may be effectively improved, and further, the running safety of the rail train may be improved.
Optionally, referring to fig. 3, fig. 3 is a third detection circuit provided in an embodiment of the present invention. In the embodiment shown in fig. 3, an alternative construction of the signal acquisition circuit 30 is shown. The signal acquisition module 30 in any embodiment of the present invention includes a plurality of signal acquisition circuits, and the number of signal acquisition circuits is not less than the number of speed sensors connected to the signal acquisition module 30, so as to ensure that each speed sensor corresponds to an independent signal acquisition circuit. That is, the signal acquisition module 30 includes a plurality of pulse signal acquisition channels, and each speed sensor corresponds to a separate signal acquisition channel.
In the embodiment shown in fig. 3, a specific configuration of the speed acquisition circuit is shown, including a filtering isolation circuit 301 and a first digital optocoupler 302, where an input end of the filtering isolation circuit 301 is connected to a corresponding speed sensor, an output end of the filtering isolation circuit 301 is connected to an input end of the first digital optocoupler 302, and an output end of the first digital optocoupler 302 is connected to the first processing module 40.
The pulse signals fed back by the corresponding speed sensors are filtered and isolated by the filtering isolation circuit 301, so that the polarity of the pulse signals is prevented from being changed, and meanwhile, the pulse signals can be subjected to electromagnetic compatibility. The first digital optocoupler 302 is configured to convert the corresponding pulse signal into a digital signal that can be identified and processed by the subsequently connected first processing module 40.
Optionally, referring to fig. 4, fig. 4 is a fourth detection circuit provided in the embodiment of the present invention, on the basis of the embodiment shown in fig. 3, each signal acquisition circuit in the signal acquisition module in the detection circuit provided in the embodiment of the present invention is further provided with a second optocoupler 303, and meanwhile, the detection circuit provided in the embodiment of the present invention further includes a second processing module 70, where,
in any signal acquisition circuit, the input end of the second digital optocoupler 303 is connected to the output end of the filtering isolation circuit 301, that is, the first digital optocoupler 302 and the second digital optocoupler 303 simultaneously receive the pulse signals output by the filtering isolation circuit 301 after being subjected to filtering processing, unlike the first digital optocoupler 301, the second digital optocoupler 303 not only converts the pulse signals into digital signals, but also performs inverse processing on the digital signals at the same time, and outputs the digital signals after being subjected to inverse processing to the second processing module 70 connected subsequently.
As shown in the embodiment of fig. 4, the first speed sensor 10 is connected to a corresponding signal acquisition circuit, a first digital optical coupler in the signal acquisition circuit outputs a first digital signal, and a second digital optical coupler outputs a first digital signal after being inverted; the second speed sensor 20 is connected with a corresponding signal acquisition circuit, and a first digital optical coupler in the signal acquisition circuit outputs a second digital signal and a second digital optical coupler outputs a second digital signal after the second digital signal is inverted; similarly, the third speed sensor 50 is connected to a corresponding signal acquisition circuit, where the first digital optocoupler outputs a third digital signal, and the corresponding second digital optocoupler outputs a third digital signal after being inverted.
Further, the inverted digital signals output from the signal acquisition circuits are all output to the second processing module 70. The second processing module 70 is configured to calculate a phase difference between the obtained inverted first digital signal and the inverted second digital signal to obtain a second phase difference, and determine that the rail train is traveling forward when a deviation between the second phase difference and a second preset angle is within the preset angle range, where a sum of the second preset angle and the first preset angle is 360 °.
Further, the second processing module 70 is further configured to calculate the running speed of the rail train according to the inverted first digital signal or the inverted second digital signal, so as to obtain a third speed value. Meanwhile, the second processing module 70 calculates the running speed of the rail train according to the inverted third digital signal, and obtains a fourth speed value.
It should be noted that, the method of the second processing module 70 for calculating the second phase difference, determining the running direction of the rail train, and calculating the third speed value and the fourth speed value is the same as the calculation method of the first processing module 40, and will not be described herein.
After determining the direction of travel of the rail train and calculating the third speed value and the fourth speed value, the second processing module 70 transmits all of the calculated results to the analysis module 60.
The analysis module 60 may further calculate a difference between the third speed value and the fourth speed value based on the functions described in the above embodiments, obtain a second difference, and send the first alarm information if the obtained second difference is not within the preset speed range. It should be noted that, since the first processing module 40 sends the first speed value and the second speed value to the analysis module 60, and the second processing module 70 also sends the third speed value and the fourth speed value to the analysis module 60, the analysis module 60 may select any one set of data to check the accuracy of the calculated running speed.
Correspondingly, the analysis module 60 also receives the track train running direction determined by the first processing module 40 and the track train running direction determined by the second processing module 70, and the analysis module 60 is further configured to determine whether the track train running direction determination results provided by the two are consistent, and send the second alarm information when the track train running direction fed back by the first processing module 40 is inconsistent with the track train running direction fed back by the second processing module 70.
In summary, according to the detection circuit provided by the embodiment of the invention, on the basis of the first processing module, the second digital optocoupler and the second processing module are arranged, the second processing module is used for carrying out corresponding calculation on the inverted digital signal to obtain the running speed calculation value of the rail train and the running direction judgment result of the train, and the analysis module is used for comparing the calculation results of the first processing module and the second processing module, so that the accuracy and the reliability of the detection result are further enhanced, and the running safety of the rail train is further improved.
Optionally, in the detection circuit provided by any one of the embodiments of the present invention, the detection circuit further includes a power module, where the power module is connected to each speed sensor, and supplies power to each speed sensor. Meanwhile, in order to ensure the stability of power supply, the power module is further provided with a monitoring circuit for detecting the stability of the power supply.
Optionally, referring to fig. 5, fig. 5 is a schematic diagram of a fifth detection circuit according to an embodiment of the present invention, it should be noted that, the power module provided in the present invention may be combined with the detection circuit provided in any one of the embodiments shown in fig. 1 to fig. 4, and the example shown in fig. 5 is a block diagram of a combination of the power module and the example shown in fig. 4, which is merely for clearly showing a connection relationship between the power module 80 and each speed sensor.
Further, a differential mode filter module (not shown) and a common mode filter module (not shown) may be further disposed between the power module 80 and each speed sensor, so as to eliminate differential mode interference and common mode interference.
In summary, on the basis of the foregoing embodiments, the embodiment of the present invention further provides a power module for the detection circuit, and supplies power to each speed sensor through the power module, and the power module is provided with the dual filter circuit, so that reliable operation of each speed sensor can be effectively ensured.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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. The software modules may be disposed 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 detection circuit, comprising: a first speed sensor, a second speed sensor, a signal acquisition module, and a first processing module, wherein,
the phase difference of pulse signals fed back by the first speed sensor and the second speed sensor at the same moment is a first preset angle;
the signal acquisition module is used for receiving a first pulse signal fed back by the first speed sensor, converting the first pulse signal into a first digital signal, receiving a second pulse signal fed back by the second speed sensor, and converting the second pulse signal into a second digital signal;
the first processing module is used for calculating the phase difference between the first digital signal and the second digital signal to obtain a first phase difference, determining that the rail train runs forwards under the condition that the deviation between the first phase difference and the first preset angle is in a preset range,
and calculating the running speed of the rail train according to the first digital signal or the second digital signal to obtain a first speed value.
2. The detection circuit of claim 1, further comprising: a third speed sensor and an analysis module, wherein,
the measurement principle of the third speed sensor is different from the measurement principle of the first speed sensor and the second speed sensor;
the signal acquisition module is also used for receiving a third pulse signal fed back by the third speed sensor and converting the third pulse signal into a third digital signal;
the first processing module is also used for calculating the running speed of the rail train according to the third digital signal to obtain a second speed value;
the analysis module is used for calculating the difference value of the first speed value and the second speed value to obtain a first difference value, and sending first alarm information when the first difference value is not in a preset speed range.
3. The detection circuit according to claim 2, wherein the signal acquisition module includes a plurality of signal acquisition circuits, and the number of the signal acquisition circuits is not less than the number of the speed sensors to which the signal acquisition module is connected;
the signal acquisition circuit includes: the filter isolation circuit and the first digital optocoupler, wherein,
the filtering isolation circuit is used for receiving the pulse signals of the corresponding speed sensor and filtering the pulse signals to obtain filtered pulse signals;
the first digital optocoupler is configured to convert the filtered pulse signal into a digital signal.
4. The detection circuit of claim 3, wherein the signal acquisition circuit further comprises: a second digital optocoupler, wherein,
the second digital optocoupler is connected with the filtering isolation circuit and is used for converting the filtered pulse signal into a digital signal and inverting the digital signal to obtain an inverted digital signal;
and under the condition that the signal acquisition circuit comprises the second digital optocoupler, the signal acquisition module is further used for converting the first pulse signal into a inverted first digital signal, converting the second pulse signal into an inverted second digital signal and converting the third pulse signal into an inverted third digital signal.
5. The detection circuit of claim 4, further comprising: a second processing module, wherein,
the second processing module is used for calculating the phase difference between the inverted first digital signal and the inverted second digital signal to obtain a second phase difference, and determining that the rail train runs forwards under the condition that the deviation between the second phase difference and a second preset angle is in the preset range, wherein the sum of the second preset angle and the first preset angle is 360 degrees;
the method comprises the steps of,
calculating the running speed of the rail train according to the inverted first digital signal or the inverted second digital signal to obtain a third speed value;
the method comprises the steps of,
and calculating the running speed of the rail train according to the inverted third digital signal to obtain a fourth speed value.
6. The detection circuit of claim 5, wherein the analysis module is further configured to calculate a difference between the third speed value and the fourth speed value to obtain a second difference, and send the first alarm message if the second difference is not within the preset speed range.
7. The detection circuit of claim 5, wherein the analysis module is further configured to send a second alert message if the direction of travel of the rail train fed back by the first processing module is inconsistent with the direction of travel of the rail train fed back by the second processing module.
8. The detection circuit of any one of claims 1-7, further comprising a power module that powers each speed sensor.
9. The detection circuit according to claim 8, wherein the power supply module is provided with a monitoring circuit for monitoring the stability of the power supply.
10. The detection circuit of claim 8, wherein a differential mode filter circuit and a common mode filter circuit are further provided between the power supply module and each speed sensor.
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| EP0541223A1 (en) * | 1991-09-10 | 1993-05-12 | Pioneer Electronic Corporation | Vehicle-direction detecting apparatus |
| JP2009052962A (en) * | 2007-08-24 | 2009-03-12 | Sumitomo Electric Ind Ltd | Vehicle speed detection system, speed detection device, and on-vehicle unit |
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| JP2016080354A (en) * | 2014-10-09 | 2016-05-16 | 古野電気株式会社 | Azimuth detection device and azimuth detection method |
| CN109305194A (en) * | 2017-07-26 | 2019-02-05 | 比亚迪股份有限公司 | Train Stopping recognition methods and device |
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