CN112130029A - Train network fault detection tool and detection method - Google Patents
Train network fault detection tool and detection method Download PDFInfo
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- CN112130029A CN112130029A CN202011078056.0A CN202011078056A CN112130029A CN 112130029 A CN112130029 A CN 112130029A CN 202011078056 A CN202011078056 A CN 202011078056A CN 112130029 A CN112130029 A CN 112130029A
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- 206010063385 Intellectualisation Diseases 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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Abstract
The invention discloses a train network fault detection tool and a detection method, which solve the problem of large workload of network fault detection in the prior art, have the beneficial effects of convenient detection and greatly reducing workload, and have the following specific schemes: the utility model provides a train network fault detection frock, including voltage comparator, one of them input connection terminal resistance selection circuit of voltage comparator, measuring circuit is connected to another input, measuring circuit inserts the connector, terminal resistance selection circuit includes many resistance selection module, terminal resistance selection circuit can input the voltage value that different module terminal resistance values of bicycle correspond to voltage comparator, voltage comparator is through comparing the voltage value size of this voltage value and measuring circuit input, realize the judgement whether to connector resistance bridge cut out.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a train network fault detection tool and a train network fault detection method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the static debugging process of the metro vehicle, if the equipment works normally, but an icon corresponding to the working state of the equipment on a network display screen is still gray, which indicates that the network signal transmission fails, in order to detect the network signal failure, the following method is generally adopted for judgment in the prior art:
firstly, measuring the terminal resistance of a marshalled train-level network by a worker;
comparing the measured resistance value with the resistance value of the train-level network terminal, and if the measured value is less than a given value, indicating that the terminal resistor is not cut off;
and thirdly, the workers disassemble and inspect the connectors of the whole train one by one.
The inventor finds that the following defects exist according to the conventional detection method:
firstly, as the marshalling of the vehicles is finished, the connectors of the whole train are disassembled and inspected according to the prior method, the cutting condition of the resistance bridges is checked one by one, the workload is extremely high, the efficiency is extremely low, and the resistance measuring equipment has large internal resistance and is not suitable for measuring the resistance value of the communication cable.
And secondly, when the worker conducts disassembly and inspection in the debugging process, the worker works by adopting a visual method and is easily influenced by personal factors and environmental factors.
And thirdly, the connector is repeatedly disassembled and assembled, so that the assembling quality of the connector is easily influenced, and the service life of the connector is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a train network fault detection tool, which does not judge by measuring the resistance value any more, compares the input voltages of two input ends by a voltage comparator, outputs the input voltages, has high detection speed and effectively reduces the workload of constructors.
The second purpose of the invention is to provide a train network fault detection method which is convenient to operate, and the constructors do not need to master a large amount of resistance value data by themselves, so that the intelligent and humanized degrees are greatly improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a train network fault detection frock, including voltage comparator, one of them input connection terminal resistance selection circuit of voltage comparator, measuring circuit is connected to another input, measuring circuit inserts the connector, terminal resistance selection circuit includes many resistance selection module, terminal resistance selection circuit can input the voltage value that different module terminal resistance values of bicycle correspond to voltage comparator, voltage comparator is through comparing the voltage value size of this voltage value and measuring circuit input, realize the judgement whether to connector resistance bridge cut out.
According to the train network fault detection tool, the multi-resistance selection module comprises a first switch and terminal resistance values corresponding to the modules of the train, and the first switch can be connected with different terminal resistance values.
According to the train network fault detection tool, the terminal resistor selection circuit further comprises a third resistor connected with the multi-resistor selection module, the third resistor is connected with an external power supply, a positive feedback resistor is arranged between the third resistor and the output end of the voltage comparator, and the voltage comparator has a hysteresis characteristic through the positive feedback resistor, so that the anti-interference capability of the detection tool is enhanced; a pull-up resistor is arranged between the external power supply and the output end of the voltage comparator, and the pull-up resistor plays a role in voltage clamping and ensures that the high level of the output end can reach a set value.
According to the train network fault detection tool, the forward input end of the voltage comparator is connected with the terminal resistor selection circuit, and the reverse input end of the voltage comparator is connected with the measurement circuit.
According to the train network fault detection tool, the positive input end of the voltage comparator is connected to one side, away from the multi-resistor selection module, of the third resistor in the terminal resistor selection circuit, and the third resistor plays a fusing protection role.
According to the train network fault detection tool, the first switch is provided with the first grounding wire clamp at one side far away from the resistance selection module, and the first grounding wire clamp is used for being connected with a train body of a rail transit vehicle so as to achieve grounding.
According to the train network fault detection tool, the measuring circuit is provided with a fifth resistor and a sixth resistor, the fifth resistor is an internal resistor of the connector, and the fifth resistor is connected to the external power supply.
According to the train network fault detection tool, the reverse input end of the voltage comparator is connected between the fifth resistor and the sixth resistor in the measuring circuit, and the sixth resistor has a voltage dividing function.
According to the train network fault detection tool, one side of the sixth resistor in the measuring circuit is connected with the second grounding wire clamp, and the second grounding wire clamp is used for being connected with a train body of a rail transit vehicle so as to achieve grounding.
According to the train network fault detection tool, the output end of the voltage comparator is connected with the display component through the first resistor, and the display component is a display lamp.
In a second aspect, the invention further provides a train network fault detection method, which includes any one of the train network fault detection tools.
A train network fault detection method comprises the following steps:
pulling out the connectors corresponding to the modules of the bicycle;
according to a bicycle module to be detected, connecting a terminal resistor corresponding to the module into a terminal resistor selection circuit;
the connector of the bicycle module to be detected is connected into the detection circuit;
and judging whether the terminal resistor is cut off or not according to the output condition of the output end of the voltage comparator.
The beneficial effects of the invention are as follows:
1) the voltage values corresponding to the terminal resistors of different modules of the bicycle can be obtained through the terminal resistor selection circuit, and the voltage comparator compares the resistance value with the voltage value of the measurement circuit where the connector is located and displays the voltage value through the display part, so that the judgment of whether the connector resistor bridge is cut off or not is realized.
2) According to the invention, through the arrangement of the voltage comparator, a large amount of data can be stored, a constructor does not need to master the data by himself, the cutting-out condition of the connector resistor can be judged directly through the indicating component, and the intellectualization and humanization of the train network fault detection are greatly improved.
3) According to the invention, the voltage comparator has a hysteresis characteristic through the arrangement of the positive feedback resistor, and the anti-interference capability of the detection tool is enhanced.
4) The invention ensures that the high level of the output end can reach a set value through the arrangement of the pull-up resistor.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a train network fault detection tool according to one or more embodiments of the invention.
Fig. 2 is a flow diagram of a train network fault detection method according to one or more embodiments of the invention.
In the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the schematic is shown only schematically.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the term "connect" and other terms in the present invention should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced in the background art, the network fault detection in the prior art has the problem of large workload, and in order to solve the technical problem, the invention provides a train network fault detection tool and a train network fault detection method.
Example one
In a typical embodiment of the present invention, referring to fig. 1, a train network fault detection tool may be configured for a train MVB network, and includes a voltage comparator, where the voltage comparator has two input ends and an output end, where one input end is connected to a terminal resistance selection circuit, and the other input end is connected to a measurement circuit, specifically in this embodiment, a forward input end of the voltage comparator is connected to the terminal resistance selection circuit, and a reverse input end of the voltage comparator is connected to the measurement circuit.
The output end of the voltage comparator is connected with a display component through a first resistor R1, and the voltage of the output end of the display component is Uo(ii) a In some examples, the display component is an indicator light.
The terminal resistance selection circuit comprises a multi-resistance selection module, in order to realize measurement of different modules, the multi-resistance selection module comprises a first switch and terminal resistance values corresponding to the modules of the bicycle, specifically R7-Rn (n is a natural number), the terminal resistance values correspond to different modules of the bicycle respectively (for example, terminal resistance values of a door control, an air conditioner, a traction inverter and the like), and the terminal resistance values corresponding to the modules of the bicycle are calculated according to different vehicle types.
Further, the first switch can be connected with different terminal resistance values, the first switch is connected with the first grounding wire clamp, and the first grounding wire clamp can be connected with the vehicle body.
The terminal resistor selection circuit further comprises a third resistor R3 connected with the multi-resistor selection module, the third resistor is connected with an external power supply, a positive feedback resistor is arranged between the third resistor and the output end of the voltage comparator, the positive feedback resistor is a second resistor R2, and the voltage comparator has hysteresis characteristics through the arrangement of the positive feedback resistor, so that the anti-interference capability of the detection tool is enhanced; a pull-up resistor is arranged between the external power supply and the output end of the voltage comparator, and the pull-up resistor plays a role in voltage clamping and ensures that the high level of the output end can reach a set value.
And a second switch is arranged between the external power supply and the detection circuit and between the external power supply and the terminal resistor selection circuit, so that the external power supply selects the 9V laminated battery.
The pull-up resistor is a fourth resistor R4, the high level of the output end can reach the voltage 9V of the external power supply through the setting of the pull-up resistor, the pull-up resistor is equivalent to the voltage stabilizing function of the output end of the voltage comparator, if the voltage stabilizing high and low level of the voltage stabilizing tube is +/-9V, the low level of the pull-up resistor is zero by matching the selected laminated battery with the pull-up resistor; the resistance value of the pull-up resistor is generally 1-10K omega, and the output of the laminated batteryThe current is extremely small, the partial pressure on the pull-up resistor is negligible, so the high level can be regarded as 9V, and correspondingly, the voltage U of the output end is enabled to be compared through the positive input end and the negative input end of the voltage comparator0It can only be a high voltage of 9V or a low level of 0V.
Wherein, the third resistance value in the terminal resistance selection circuit is smaller, plays the role of fusing protection, the forward input end of the voltage comparator is connected to one side of the third resistance far away from the multi-resistance selection module in the terminal resistance selection circuit, and two parallel diodes D capable of being connected into the vehicle body are arranged on the connecting line1And D2The two diodes are reversely arranged to play a role of voltage stabilization, and the input voltage of the positive input end of the voltage comparator is UN。
Regarding the measuring circuit, the measuring circuit is provided with a fifth resistor R5 and a sixth resistor R6, the fifth resistor is an internal resistor of a connector of the existing rail transit vehicle, such as a DB9-MVB connector (D-SUB 9 pin connector, called DB9-MVB connector because the measuring circuit is used in an MVB network), the DB9-MVB connector is connected into the measuring circuit through a positive gauge pen and a negative gauge pen, the sixth resistor plays the roles of current limiting and voltage dividing, one end of the fifth resistor in the measuring circuit is connected with an external power supply, one end of the sixth resistor is connected with a second grounding wire clamp and is grounded through the second grounding wire clamp, the reverse input end of a voltage comparator is connected between the fifth resistor and the sixth resistor in the measuring circuit, and the input voltage of the reverse input end of the voltage comparator is UI。
According to the detection tool, the hysteresis voltage comparator principle is utilized, the voltage values corresponding to the terminal resistors of the modules of different bicycles are compared through the detection tool, and the judgment is carried out through the indicator lamp at the output end of the voltage comparator, so that the judgment on whether the DB9-MVB connector resistor bridge is cut off or not is realized.
Further, the voltage comparator selects the Lm339 integrated circuit board, the chip storage space of the voltage comparator is large, the terminal resistance values of different modules of different vehicle types can be stored, a constructor does not need to master a large amount of resistance value data, only the vehicle type and the measuring module need to be selected during construction, the DB9-MVB connector resistance cutting condition can be judged according to whether the indicator lamp on the tool is turned on, and the intelligent and humanized degrees are greatly improved.
In addition, it should be explained that the sizes of the first resistor, the second resistor, the third resistor, the fourth resistor and the sixth resistor can be selected according to actual needs, and the first ground clip and the second ground clip are both existing common ground clips.
Example two
A train network fault detection method, as shown in fig. 2, includes a train network fault detection tool according to the first embodiment.
When the detection tool is used, the detection tool comprises the following contents:
finding the positions of DB9-MVB connectors (DB 9 connectors in the figure) of the modules of the bicycle according to the wiring diagram and pulling the connectors off so that the modules of the bicycle are independent;
starting a detection tool, connecting terminal resistors corresponding to different modules of a bicycle to a terminal resistor selection circuit through a first switch according to a bicycle module to be detected to form a reference voltage URefThe reference voltage becomes the input voltage U of the positive input end of the voltage comparator after passing through the third resistorNConsidering that the third resistance is small, the reference voltage URefAre directly involved in the comparison;
inserting a DB9-MVB connector male pin or female pin into a detection tool detection circuit, butting the detection tool detection circuit with the bicycle DB9-MVB connector male pin or female pin, and simultaneously respectively connecting a first grounding wire clamp and a second grounding wire clamp of the detection tool with a bicycle body;
connecting an external power supply, if the terminal resistance of each module of the bicycle is not cut off, UI﹥UN，U0Low level, no indicator light, if the termination resistance is cut off, UI﹤UN，U0At high level, the indicator light is on, proving that the termination resistor has been cut.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a train network fault detection frock, a serial communication port, including the voltage comparator, one of them input of voltage comparator connects terminal resistance selection circuit, another input connects measuring circuit, measuring circuit inserts the connector, terminal resistance selection circuit includes many resistance selection module, terminal resistance selection circuit can input the voltage value that different module terminal resistance values of bicycle correspond to the voltage comparator, the voltage comparator is through comparing the voltage value size of this voltage value and measuring circuit input, realize the judgement whether to cutting out the connector resistance bridge.
2. The train network fault detection tool according to claim 1, wherein the multiple resistance selection modules comprise first switches and terminal resistance values corresponding to the modules of the train, and the first switches can be connected with different terminal resistance values.
3. The train network fault detection tool according to claim 1, wherein the terminal resistor selection circuit further comprises a third resistor connected with the multiple resistor selection module, the third resistor is connected with an external power supply, a positive feedback resistor is arranged between the third resistor and the output end of the voltage comparator, and a pull-up resistor is arranged between the external power supply and the output end of the voltage comparator.
4. The train network fault detection tool of claim 1, wherein the first switch is provided with a first ground clamp at a side away from the resistance selection module.
5. The train network fault detection tool according to claim 1, wherein a forward input end of the voltage comparator is connected with the terminal resistor selection circuit, and a reverse input end of the voltage comparator is connected with the measurement circuit.
6. The train network fault detection tool according to claim 5, wherein a positive input end of the voltage comparator is connected to one side, away from the multi-resistor selection module, of the third resistor in the terminal resistor selection circuit.
7. The train network fault detection tool according to claim 3, wherein the measurement circuit is provided with a fifth resistor and a sixth resistor, the fifth resistor is an internal resistor of the connector, and the fifth resistor is connected to the external power supply.
8. The train network fault detection tool according to claim 7, wherein an inverting input terminal of the voltage comparator is connected between a fifth resistor and a sixth resistor in the measurement circuit.
9. The train network fault detection tool of claim, wherein a second ground clamp is connected to one side of the sixth resistor in the measurement circuit.
10. The train network fault detection tool according to claim 1, wherein an output end of the voltage comparator is connected with a display component through a first resistor.
11. A train network fault detection method, characterized by comprising a train network fault detection tool according to any one of claims 1 to 10.
12. A train network fault detection method is characterized by comprising the following steps:
pulling out the connectors corresponding to the modules of the bicycle;
according to a bicycle module to be detected, connecting a terminal resistor corresponding to the module into a terminal resistor selection circuit;
the connector of the bicycle module to be detected is connected into the detection circuit;
and judging whether the terminal resistor is cut off or not according to the output condition of the output end of the voltage comparator.
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Cited By (1)
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| CN112130029B (en) | 2024-03-01 |
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