CN109884450B - Device and method for detecting cable state of transponder - Google Patents
Device and method for detecting cable state of transponder Download PDFInfo
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Abstract
The invention relates to a device and a method for detecting the cable state of a transponder, wherein the device comprises a signal acquisition module, a signal processing module and a judging and analyzing module, wherein the input of the signal acquisition module is a C interface of an LEU (Low-energy Unit) and is used for acquiring a C6 voltage signal and a C6 current signal, the output end of the signal acquisition module is connected to the input end of the signal processing module, the signal processing module is used for processing the acquired C6 voltage signal and C6 current signal and respectively outputting corresponding square wave signals, the output end of the signal processing module is connected to the input end of the judging and analyzing module, and the judging and analyzing module is used for analyzing the square wave signals and giving a judging and analyzing result. Compared with the prior art, the invention not only can adaptively detect cables with different distance lengths, but also can detect normal, open-circuit and short-circuit states of the cables.
Description
Technical Field
The invention relates to the technical field of cable detection, in particular to a device and a method for detecting the cable state of a transponder.
Background
In the high-speed railway control system, whether the information transmitted by the transponder is correct or not is directly related to the driving safety of the high-speed train. The information transmission between the transponder and the train control center mainly depends on LEU (trackside electronic unit), the transponder is connected with the LEU through a transponder cable, and in practical application, once the transponder cable fails, such as an open circuit or a short circuit, the train control center cannot timely and accurately receive the transponder information, so that the control and operation of the train are affected. Therefore, the state of the transponder cable needs to be detected so as to remove faults early, and the cable distance is greatly different in the field due to the complexity of engineering design, and the conventional cable state detection technology mainly has the following defects:
1. only long-distance cables or short-distance cables can be detected, and the long-distance cables and the short-distance cables cannot be detected at the same time.
2. Only normal and fault conditions can be detected, and long-distance cable opens and short-distance cable shorts cannot be distinguished.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for detecting the cable state of a transponder, which not only can adaptively detect cables with different distance lengths, but also can detect the normal, open and short circuit states of the cables.
The aim of the invention can be achieved by the following technical scheme: the device for detecting the cable state of the transponder comprises a signal acquisition module, a signal processing module and a judging and analyzing module, wherein the input of the signal acquisition module is a C interface of an LEU, the output end of the signal acquisition module is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the judging and analyzing module;
the signal acquisition module is used for acquiring a C6 voltage signal and a C6 current signal;
the signal processing module is used for processing the acquired C6 voltage signal and C6 current signal and respectively outputting corresponding square wave signals;
the judging and analyzing module is used for analyzing the square wave signal and giving out a judging and analyzing result.
Preferably, the signal processing module includes a first comparator, a second comparator and a third comparator, where the first comparator is used to convert the C6 voltage signal and output a corresponding first square wave signal, the second comparator is used to convert the C6 current signal and output a corresponding second square wave signal, and the third comparator is used to convert the C6 current signal and output a corresponding third square wave signal.
Preferably, the judgment analysis module adopts a programmable logic device.
Preferably, the programmable logic device is an FPGA chip.
The invention also provides a method for detecting the cable state of the transponder, which comprises the following steps:
step 1, collecting a C6 voltage signal and a C6 current signal;
step 2, processing the C6 voltage signal and the C6 current signal acquired in the step 1;
step 3, judging the distance of the cable, if the cable is judged to be a short-distance cable, executing step 4, and if the cable is judged to be a long-distance cable, executing step 5;
step 4, analyzing the state of the short-distance cable;
and 5, analyzing the state of the long-distance cable.
Further, the processing of the C6 voltage signal and the C6 current signal in the step 2 specifically includes: and (3) converting the C6 voltage signal acquired in the step (1) and outputting a corresponding first square wave signal, and simultaneously converting the C6 current signal acquired in the step (1) and outputting a corresponding second square wave signal and third square wave signal.
Further, the determining the distance between the cables in the step 3 specifically includes: and (2) calculating the pulse width of the first square wave signal in the step (2), comparing the pulse width of the first square wave signal with a first preset threshold value, judging as a short-distance cable if the pulse width of the first square wave signal is smaller than the first preset threshold value, and judging as a long-distance cable if the pulse width of the first square wave signal is larger than or equal to the first preset threshold value.
Further, in the case of determining that the short-distance cable is a short-distance cable, the analyzing the state of the short-distance cable in the step 4 specifically includes:
step 4.1, detecting whether a second square wave signal exists, if the second square wave signal cannot be detected, judging that the short-distance cable is in an open circuit state, otherwise, executing the step 4.2;
and 4.2, calculating the pulse width of a second square wave signal, comparing the pulse width of the second square wave signal with a second preset threshold value, judging that the short-distance cable is in a normal state if the pulse width of the second square wave signal is smaller than the second preset threshold value, and judging that the short-distance cable is in a short-circuit state if the pulse width of the second square wave signal is larger than or equal to the second preset threshold value.
Further, in the case where the long-distance cable is determined, the analyzing the state of the long-distance cable in the step 5 specifically includes:
step 5.1, comparing the voltage phase with the current phase according to the front-rear difference interval of the second square wave signal and the third square wave signal, judging that the long-distance cable is in a short circuit state if the voltage phase lags the current phase, and executing step 5.2 if the voltage phase leads the current phase;
and 5.2, calculating the time width of the voltage phase leading current phase, comparing the time width with a third preset threshold value, judging that the long-distance cable is in a normal state if the time width is smaller than the third preset threshold value, and judging that the long-distance cable is in an open state if the time width is larger than or equal to the third preset threshold value.
Compared with the prior art, the invention has the following beneficial effects:
1. the distance of the cable can be automatically judged, other auxiliary equipment is not required to be additionally added, and the installation and maintenance difficulty is reduced.
2. The method can adaptively analyze the cable state according to the distance of the cable, improves the accuracy of judging the cable state and can detect and distinguish the normal, open-circuit and short-circuit states of the cable compared with the traditional method.
3. The detection method provided by the invention is realized based on the comparator and the programmable logic device, has good real-time performance, and can judge the state of the cable in a short time.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic diagram of circuit connection according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Examples
As shown in fig. 1, a device for detecting a cable state of a transponder includes a signal acquisition module, a signal processing module and a judgment analysis module, wherein an input of the signal acquisition module is a C interface of an LEU, an output end of the signal acquisition module is connected to an input end of the signal processing module, and an output end of the signal processing module is connected to an input end of the judgment analysis module.
The signal acquisition module is used for acquiring a C6 voltage signal and a C6 current signal;
the signal processing module is used for processing the acquired C6 voltage signal and C6 current signal and respectively outputting corresponding square wave signals;
the judging and analyzing module is used for analyzing the square wave signals and giving out judging and analyzing results.
The circuit connection relationship of the device in this embodiment is shown in fig. 2, the transponder is connected with the LEU through a transponder cable, the C interface of the LEU is connected to the signal acquisition module, the signal acquisition module acquires the C6 voltage signal and the C6 current signal, the signal acquisition module includes a sampling resistor R, one end of the sampling resistor R is connected with the C6 current signal, and the other end is grounded.
The signal processing module comprises a first comparator, a second comparator and a third comparator, wherein the first comparator is used for converting a C6 voltage signal and outputting a corresponding first square wave signal V-C6-REF, the second comparator is used for converting a C6 current signal and outputting a corresponding second square wave signal V-C6, and the third comparator is used for converting a C6 current signal and outputting a corresponding third square wave signal I-C6. The output ends of the first comparator, the second comparator and the third comparator are all connected to
The judging and analyzing module adopts an FPGA chip and is used for calculating and analyzing the first square wave signal V-C6-REF, the second square wave signal V-C6 and the third square wave signal I-C6.
Fig. 3 shows a method for detecting the cable status of a transponder according to the device of the present embodiment, comprising:
step 1, collecting a C6 voltage signal and a C6 current signal;
step 2, processing the C6 voltage signal and the C6 current signal acquired in the step 1;
step 3, judging the distance of the cable, if the cable is judged to be a short-distance cable, executing step 4, and if the cable is judged to be a long-distance cable, executing step 5;
step 4, analyzing the state of the short-distance cable;
and 5, analyzing the state of the long-distance cable.
Wherein, in the step 2, the C6 voltage signal and the C6 current signal are processed, and the specific process is as follows: converting the C6 voltage signal and outputting a corresponding first square wave signal V-C6-REF, and simultaneously converting the C6 current signal and outputting a corresponding second square wave signal V-C6 and a corresponding third square wave signal I-C6;
in the step 3, the distance of the cable is judged, and the specific process is as follows: the pulse width of the first square wave signal V-C6-REF is calculated, the pulse width of the V-C6-REF is compared with a first preset threshold value, if the pulse width of the V-C6-REF is smaller than the first preset threshold value N-DOOR1, the short-distance cable is judged, and if the pulse width of the V-C6-REF is larger than or equal to the first preset threshold value N-DOOR1, the long-distance cable is judged.
The analyzing the state of the short-distance cable in the step 4 specifically includes:
step 4.1, detecting whether a second square wave signal V-C6 exists, if V-C6 cannot be detected, judging that the short-distance cable is in an open circuit state, otherwise, executing step 4.2;
and 4.2, calculating the pulse width of the second square wave signal V-C6, comparing the pulse width of the V-C6 with a second preset threshold value N-DOOR2, judging that the short-distance cable is in a normal state if the pulse width of the V-C6 is smaller than the second preset threshold value N-DOOR2, and judging that the short-distance cable is in a short-circuit state if the pulse width of the V-C6 is larger than or equal to the second preset threshold value N-DOOR 2.
The analyzing the state of the long-distance cable in the step 5 specifically includes:
step 5.1, comparing the voltage phase with the current phase according to the front-rear difference interval of the second square wave signal V-C6 and the third square wave signal I-C6, judging that the long-distance cable is in a short circuit state if the voltage phase lags the current phase, and executing step 5.2 if the voltage phase leads the current phase;
and 5.2, calculating the time width of the voltage phase leading current phase, comparing the time width with a third preset threshold value, judging that the long-distance cable is in a normal state if the time width is smaller than the third preset threshold value N-DOOR3, and judging that the long-distance cable is in an open state if the time width is larger than or equal to the third preset threshold value N-DOOR 3.
The principle of the detection method provided in this embodiment includes three aspects, a first aspect is to determine the cable distance, a second aspect is to analyze the state of the short-distance cable, and a third aspect is to analyze the state of the long-distance cable:
1. when the cable distance is relatively short, the whole cable impedance is not completely matched with the impedance of the mutual inductance coil, so that the C6 voltage signal is smaller, when the cable distance is relatively long, the whole cable impedance is compared and matched with the impedance of the mutual inductance coil, so that the C6 voltage signal is larger, and therefore, the distance length of the cable can be judged by calculating the pulse width of the square wave signal V-C6-REF corresponding to the C6 voltage signal and comparing the pulse width value with a preset threshold value N-DOOR 1;
2. for a short-distance cable, the C6 current signal is almost 0 in the open state, so that the C6 current signal corresponding to the square wave signal V-C6 cannot be detected, and the C6 current signal exists in the normal state and the short-circuit state, wherein the difference is that the C6 current signal is very large in the short-circuit state, so that the cable state can be judged to be normal or short-circuit by calculating the pulse width of the square wave signal V-C6 corresponding to the C6 current signal and comparing the pulse width with a preset threshold value N-DOOR 2;
3. for long-distance cables, the voltage phase is delayed by the current phase in the short-circuit state, and the voltage phase is advanced by the current phase in the normal state and the open state, wherein the difference is that the time width of the voltage phase in the advanced current phase in the open state is very large, so that the cable state can be judged to be normal or open by calculating the time width of the voltage phase in the advanced current phase and comparing the time width with a preset threshold value N-DOOR 3.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (4)
1. The device comprises a signal acquisition module, a signal processing module and a judging and analyzing module, wherein the input of the signal acquisition module is a C interface of an LEU, the output end of the signal acquisition module is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the judging and analyzing module;
the signal acquisition module is used for acquiring a C6 voltage signal and a C6 current signal;
the signal processing module is used for processing the acquired C6 voltage signal and C6 current signal and respectively outputting corresponding square wave signals;
the judging and analyzing module is used for analyzing the square wave signal and giving out a judging and analyzing result;
the method comprises the following steps:
step 1, collecting a C6 voltage signal and a C6 current signal;
step 2, processing the C6 voltage signal and the C6 current signal acquired in the step 1;
step 3, judging the distance of the cable, if the cable is judged to be a short-distance cable, executing step 4, and if the cable is judged to be a long-distance cable, executing step 5;
step 4, analyzing the state of the short-distance cable;
step 5, analyzing the state of the long-distance cable;
the processing of the C6 voltage signal and the C6 current signal in step 2 specifically includes: converting the C6 voltage signal acquired in the step 1 and outputting a corresponding first square wave signal, and simultaneously converting the C6 current signal acquired in the step 1 and outputting a corresponding second square wave signal and third square wave signal;
the analyzing the state of the short-distance cable in the step 4 specifically includes:
step 4.1, detecting whether a second square wave signal exists, if the second square wave signal cannot be detected, judging that the short-distance cable is in an open circuit state, otherwise, executing the step 4.2;
step 4.2, calculating the pulse width of a second square wave signal, comparing the pulse width of the second square wave signal with a second preset threshold value, judging that the short-distance cable is in a normal state if the pulse width of the second square wave signal is smaller than the second preset threshold value, and judging that the short-distance cable is in a short-circuit state if the pulse width of the second square wave signal is larger than or equal to the second preset threshold value;
the analyzing the state of the long-distance cable in the step 5 specifically includes:
step 5.1, comparing the voltage phase with the current phase according to the front-rear difference interval of the second square wave signal and the third square wave signal, judging that the long-distance cable is in a short circuit state if the voltage phase lags the current phase, and executing step 5.2 if the voltage phase leads the current phase;
step 5.2, calculating the time width of the voltage phase leading current phase, comparing the time width with a third preset threshold value, judging that the long-distance cable is in a normal state if the time width is smaller than the third preset threshold value, and judging that the long-distance cable is in an open state if the time width is larger than or equal to the third preset threshold value;
the step 3 of judging the distance of the cable specifically comprises the following steps: and (2) calculating the pulse width of the first square wave signal in the step (2), comparing the pulse width of the first square wave signal with a first preset threshold value, judging as a short-distance cable if the pulse width of the first square wave signal is smaller than the first preset threshold value, and judging as a long-distance cable if the pulse width of the first square wave signal is larger than or equal to the first preset threshold value.
2. The method of claim 1, wherein the signal processing module comprises a first comparator for converting the C6 voltage signal and outputting a corresponding first square wave signal, a second comparator for converting the C6 current signal and outputting a corresponding second square wave signal, and a third comparator for converting the C6 current signal and outputting a corresponding third square wave signal.
3. The method of claim 1, wherein the decision analysis module employs a programmable logic device.
4. The method of claim 3, wherein the programmable logic device is an FPGA chip.
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| CN110928274B (en) * | 2019-12-09 | 2021-03-02 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Test system of LEU equipment |
| CN112653088B (en) * | 2020-12-17 | 2022-08-30 | 卡斯柯信号有限公司 | Transponder cable self-adaptive short-circuit protection method of ground electronic unit |
| CN112653690B (en) * | 2020-12-18 | 2022-07-26 | 卡斯柯信号有限公司 | Analog demodulation circuit for acquiring message by C interface of ground electronic unit |
| CN113741399A (en) * | 2021-09-14 | 2021-12-03 | 北京铁路信号有限公司 | Test equipment and method |
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