JP5773662B2 - Faulty device identification system - Google Patents

Description

  The present invention relates to a faulty device specifying system that specifies which one of a plurality of self-diagnosis result output devices has failed, and more specifically, by using a resistance circuit in which a plurality of resistors corresponding to each device are connected in series. The present invention relates to a faulty device specifying system capable of transmitting a diagnosis result so that a faulty device can be specified even with a signal line. In particular, the present invention is an ATS-P ground element installed on a track of a railway track, and is intended for an ATS-P ground element with a failure detection function that detects a failure of a circuit or the like in its own device. The present invention relates to a faulty device specifying system suitable for specifying a device.

  Railway companies are increasingly introducing ATS-P systems in order to improve their driving safety. For example, in the case of East Japan Railway Company, a system combining a code processor (EC), a repeater (RP), and a power source ground unit is installed in a high-density line section in the Tokyo metropolitan area. In this system, a fail-safe computer is used for the code processor (EC), and in addition to fault diagnosis of the code processor (EC) itself, a relay (RP) It can detect a failure of a grounded power unit. This failure information is output to a maintenance area of the signal command center. Although this system has a difficult equipment cost, it can be used for operation management and railroad crossing control because it can receive information such as train numbers and decelerations from trains with 3.0 MHz information waves (for example, Non-patent document 1). Here, such systems ATS-PI to ATS-PIV (N) are called ATS-P systems with a repeater failure detection function.

  FIG. 4A is a schematic block diagram showing the structure of a conventional ATS-P system with a repeater failure detection function. In addition, although a repeater may be integrated with a ground unit, it is set as a separate body here. Such an ATS-P system with a repeater failure detection function includes an on-board device mounted on a train 12 traveling on a railroad track 11 and an ATS- with a repeater failure detection function installed on the ground side. P ground equipment. The ground device is provided corresponding to the traffic light 13 and the instrument box 14 (signal device tool box), and is installed along the track 11. This ATS-P ground device is composed of one code processor, one or more sets of repeaters and ground units, and the code processor receives power DC135V (in the case of ATS-PIV, ATS- In the case of PI to ATS-PIII, AC 100 V) is supplied, and communication with the repeater is performed by FSK (frequency shift keying) communication. The repeater and the ground unit are set as a one-to-one pair, and are installed at an appropriate distance from the traffic light 13.

Then, the code processor inputs the signal device indications GR and YR as relay signals from the instrument box 14 and sends the indication information and distance information to the signal device 13 to the repeater. Therefore, the on-board device of the train 12 that has traveled there receives information useful for generating the speed check pattern P and performs train stop control.
In addition, since the fail-safe code processor determines whether each ground unit is normal by sending and receiving a message to the repeater, it is not necessary for each ground unit to perform self-diagnosis. Need not be output. Therefore, it is not necessary to lay a signal line (line) for notifying the self-diagnosis result from each ground element to the code processor.

  On the other hand, in lines other than the high-density line in the metropolitan area, a system using an ATS-P (N) ground element, which is an ATS-P ground element that does not require a code processor or a repeater and is highly economical, is installed. ing. The ATS-P (N) ground unit is a non-powered ground unit that transmits a telegram corresponding to the indication of the traffic signal to the train only when a 245 kHz power wave is received from the train (for example, see Non-Patent Document 2). ). There is also a ground checker with a teletext check function that detects the failure (self-diagnosis) of the main part of the ground stick based on the telegram check (see, for example, Patent Document 1), but operates only when a power wave is received. Since it is a device, there is no output of the detection results to maintenance areas. Compared with the above-described ATS-P ground device with a repeater failure detection function having a code processor and a grounded power source ground device, the ATS-P (N) ground device has less than half the equipment cost. Here, such a ground element with a telegram checking function will be referred to as an ATS-P (N) ground element with a telegram checking function.

4 (b) and (c) show the structure of a conventional ATS-P (N) ground unit 20 with a telegram checking function, and FIG. 4 (b) is a schematic block diagram of the ground equipment of the ATS-P (N) system. (C) is a block diagram of the ATS-P (N) ground unit 20 with a telegram checking function.
The ATS-P (N) system (see FIG. 4 (b)) also includes an on-board device mounted on a train 12 traveling on a railroad track 11 and an ATS-P (N) installed on the ground side. An ATS-P (N) ground unit that is connected to the instrument box 14 by a cable and can transmit a relay signal is provided along the track 11. Installed on the ground side.

  One or a plurality of ATS-P (N) ground elements are also provided corresponding to the traffic light 13, and in the case of a plurality of the ATS-P (N) ground elements, the ATS-P (N) ground elements are distributed at appropriate distances from the traffic light 13 (3 in FIG. 4B). The ground unit 20, 20, 20 is exemplified), and the signal device indication GR, YR is directly input from the instrument box 14 by a relay signal, and the indication information, the distance information to the signal device 13, and the like are 1.7 MHz radio waves. It is supposed to send in. In addition, the ATS-P (N) ground element is a non-powered ground element, and when a 245 kHz power wave arrives from the on-board device of the train 12 that has traveled there, it receives it and receives operating power. It is supposed to occur. When the train 12 travels on the track 11 and approaches the ground unit 20, for example, the ground unit 20 obtains power from the power wave of 245 kHz, inputs the signal indications GR and YR, and transmits information radio waves. . For this reason, on routes that do not require information transmission from the on-board device to the ground device, it is used in the same sense as the ATS-S ground unit.

  The ATS-P (N) ground unit 20 with a telegram checking function is obtained by adding a failure detection function to the ATS-P (N) ground unit having such a basic configuration, and specifically (FIG. 4C). (Refer to signal indications GR and YR), the signal transmission 13 is discriminated whether it is a G indication, a Y indication or an R indication, and a corresponding transmission message Ma is read out from the message ROM and generated with the same contents. A non-transmission message Mc read from another message ROM and generated, a matching circuit 21 for matching two identical messages Ma and Mb output from the plurality of message ROMs, and 1.7 MHz The above-described modulation circuit and transmission coil adapted to radio waves, and a failure processing circuit that allows a transmission message Ma to be sent to the vehicle by the modulation circuit when matching is matched, but prohibits the modulation circuit from sending a message when matching does not match With There. The ground unit 20 also includes a receiving coil adapted to receive a 245 kHz radio wave and a power supply circuit that generates operating power from the received signal by rectification or the like and supplies the operating power to each unit in order to eliminate power. .

  In such an ATS-P (N) ground unit 20 with a telegram checking function, multiple telegrams having the same contents are generated from a plurality of telegram ROMs, and one is used as a transmission telegram Ma to be transmitted. However, the other is a non-transmission message Mc that is not an object of transmission, and collation between the transmission message Ma and the non-transmission message Mc is performed by the collation circuit 21, so that a failure of the own device, particularly a failure of the message storage unit, occurs. Can be detected (self-diagnosis). Therefore, it is possible to realize the function of detecting a failure of the own device without using a costly fail-safe computer, so that safety can be ensured easily and inexpensively. Since it was not designed to output to the box 14, it was not possible to collect diagnostic results such as failure information through the instrument box at the signal command center.

On the other hand, a simple ATS-P ground unit with a failure detection function capable of detecting a failure not only to the message storage unit but also to the transmission unit has been devised (see Patent Document 2). FIG. 5 (a) is a schematic block diagram of ground equipment in which only one such ground element 30 is installed, and FIG. 5 (b) is an overview of ground equipment in which three ground elements 30 are installed in parallel. It is a block diagram.
The ground unit 30 (see FIG. 5A) receives the transmission radio wave Ma of the transmission telegram Ma to obtain the reception telegram Mb, and compares the reception telegram Mb with the non-transmission telegram Mc by the matching circuit 31. By doing so, the failure can be detected not only to the message storage unit but also to the transmission unit.

Further, the detection result (self-diagnosis result) is converted to a relay signal (relay drive signal) that can drive the relay NRM 1 by the output circuit 32 and then sent to the instrument box 14.
Further, since the power supply circuit is provided with the power supply circuit that receives the power supply from the instrument box 14 and generates the operating power of each part, the self-diagnosis and the diagnosis result output can always be performed.
The relay NRM1 is provided in the instrument box 14, and the instrument box 14 is provided with a steady state monitoring device 15 as a standard, and the steady state monitoring device 15 inputs a relay signal (relay contact signal) output from the relay NRM1 or the like. The information is collected and transmitted to a maintenance area of an external signal command center via communication.

  When a plurality of, for example, three ground elements 30 are connected to such an instrument box 14 (see FIG. 5B), the self-diagnosis result is sent from each of the ground elements 30 to the instrument box 14 by a relay drive signal. Therefore, the instrument box 14 is provided with a total of three relays NRM1, NRM2, and NRM3 that are driven by the relay drive signal from each ground element 30, and these relay contact signals are input to the steady state monitoring device 15. Will be. In such an ATS-P system with a so-called diagnostic result output function, instead of being able to know whether or not the ground unit 30 is normal at the signal command center for each ground unit 30, the ground unit 30 and the instrument It is necessary to lay the diagnostic result transmission signal lines 33, 33, 33 capable of relay signal transmission connecting the box 14 for each ground element 30, 30, 30.

  However (see FIG. 5C), it is possible to share and reduce the number of signal lines 33 for transmitting the diagnostic results. For example, the relays NRM1, NRM2, and NRM3 are connected from the instrument box 14 to the ground unit 30, It is easy to move the relay contacts one by one to 30, 30 or the nearest connection box, and then insert the relay contacts into the common diagnostic result transmission signal line 34 in the form of series connection. . However, in this case, during the transmission of the diagnosis result, a logical product is taken if the normal state is positive, and a logical sum is taken if the failure state is positive. In the steady-state monitoring device 15 of the instrument box 14 to be input, it can be determined that all the ground elements 30 are normal and that any of the ground elements 30 has failed. It is impossible to specify which of the failed ground child 30 is.

  In addition, when looking at the failure detection technology of the track circuit in the same railway field (see Patent Documents 3 and 4), the voltage and current between the two terminals are measured, and the disconnection or short circuit in the rail or signal line ahead of the two terminals. Cable contact detection devices and track circuit failure site identification devices that are designed to identify the failure site have been developed. In this method, the failure location is determined based on the fact that the resistance value change in the resistance network causes a change in the amount of the measured value between the two terminals depending on the change location. The failure site cannot be specified unless the wire is actually broken, short-circuited, or a failure state close thereto.

  Further, when the scope is expanded to different fields, a technique for identifying a disconnection part of a line or a faulty device in a multidrop wiring system in which a plurality of signal transmitters are connected on a transmission line is known (for example, Patent Document 5). reference). In this method (see FIG. 6), resistors Rb to Rd having different values are inserted one by one between a connection point of the device Dev and a connection point of another device Dev with respect to the signal line, thereby providing a plurality of resistors. Incorporating a resistor circuit connected in series into the transmission line to which the signal transmitter is connected, and using this resistor circuit, it is possible to identify a faulty device even with a small number of signal lines. Detection is not performed in response to a short circuit, and each device Dev outputs a DC current of a certain value to the transmission line, thereby enabling detection.

JP 2001-199335 A Japanese Patent Application No. 2011-008299 Japanese Patent Laid-Open No. 2005-199838 Japanese Patent Application No. 2010-079641 JP 2004-061448 A

Overview of Signals for Railway Electrical Engineers “ATS / ATC”, pages 51-73 Japan Railway Electrical Engineering Association June 28, 2005 Revised 2nd edition issued Overview of Signals for Railway Electrical Engineers “ATS / ATC”, pages 73-74 Japan Railway Electrical Engineering Association June 28, 2005 Revised 2nd edition issued

  Under such circumstances, the number of diagnostic result transmission signal lines is less than the number of devices, targeting self-diagnosis result output devices such as ATS-P ground unit with failure detection function, which have come to output detection results. However, in order to be able to identify the faulty device, a resistor circuit in which a plurality of resistors corresponding to each device are connected in series is introduced, and it is incorporated into the signal line for transmission of diagnostic results, and the resistor circuit It would be better to identify the faulty device based on the change in resistance value.

  However, as described above, the ATS-P ground element outputs the detection result as a relay signal. If the relay signal is a relay contact signal, the open / close state of the relay contact is a signal as it is. If it is a signal and is a relay drive signal, the relay contact is opened and closed by receiving a power supply of a predetermined voltage such as 24 V or 100 V and taking a voltage value of either a predetermined voltage or no voltage as a signal state. This is an on / off signal corresponding to opening and closing, and such an on / off signal indicating a binary state corresponding to opening and closing is easy to use because it can be used independently for driving and controlling electric circuit switching members such as relay contacts and switches, but is not suitable for current control. Therefore, it is necessary to add a constant current circuit or the like when used for current control.

For this reason, the above-described multi-drop wiring failure detection method that requires constant current control of the output of each of the plurality of devices is not suitable for introduction as it is.
In addition, since it is impossible to cut or connect the resistance element itself, the above-described cable contact detection method and track circuit failure site identification method cannot be introduced as they are.
Therefore, even if a plurality of self-diagnosis result output devices output self-diagnosis results as on-off signals, a resistance circuit in which resistors corresponding to each device are connected in series is used as a signal line for transmitting diagnosis results. It is a technical problem to realize a faulty device specifying system capable of transmitting a diagnosis result so that a faulty device can be specified even with the signal line.

  The faulty device identification system of the present invention (Solution 1) was devised to solve such a problem, and each of them checks whether its own state is normal or faulty and outputs a self-diagnosis result as an on / off signal. A plurality of self-diagnosis result output devices, a resistance circuit in which a plurality of resistors having different values are connected in series, and a self-diagnosis result of any of the self-diagnosis result output devices connected in parallel to any one of the resistors. A plurality of short circuit simulation circuits that are turned on or off in accordance with the power supply circuit, an energization circuit that energizes the resistance circuit, and the presence or absence of a failure associated with the self-diagnosis result output device based on the voltage and current associated with the energization And determining means for identifying a failed device at the time of failure determination.

  The failure device identification system according to the present invention is (solution 2), the failure device identification system according to solution 1, wherein the self-diagnosis result output device outputs a self-diagnosis result by a relay (short circuit pseudo-relay). The short-circuit simulation circuit performs switching of the conduction cutoff state at a relay contact of the relay (short-circuit simulation relay).

  Furthermore, the failure device identification system of the present invention (Solution means 3) is the failure device identification system of the above solution means 1 and 2, wherein the determination means is connected via a resistor at a voltage corresponding to the energization state of the energization circuit. A plurality of discriminating relays which are driven in the above-described manner, and a judgment and a specific result are output as a relay signal.

  In such a faulty device specifying system of the present invention (Solution 1), one self-diagnosis result output device, a short circuit simulation circuit, and a resistor are provided so that the number of diagnostic result transmission signal lines can be reduced. A resistor circuit in which resistors corresponding to each device are connected in series is used as a common diagnostic result transmission signal line, but the short circuit simulator circuit is either in a conductive state or a disconnected state. Since it is of an electric circuit opening / closing type, even if the self-diagnosis result is an on / off signal corresponding to opening / closing, a constant current circuit or the like is not required, and the above-described association can be easily realized.

And, for the corresponding self-diagnosis result output device, short circuit simulation circuit, and resistance, when the self-diagnosis result is a failure, the short circuit simulation circuit is cut off. When the self-diagnostic result is normal, the short circuit dummy circuit becomes conductive, so a state equivalent to a short circuit is created, and the resistance is the accumulation of the resistance value of the resistance circuit. It will come off.
Alternatively, when the self-diagnostic result is normal for the corresponding self-diagnosis result output device, short-circuit simulation circuit, and resistance, the short-circuit simulation circuit is in a cut-off state, so that the resistance of the resistance circuit is not broken or short-circuited. Participates in the accumulation of values, but when the self-diagnostic result is a failure, the short-circuiting pseudo-control circuit conducts, so a state equivalent to a short-circuited resistance is created in a pseudo manner, and the resistance accumulates the resistance value of the resistance circuit. It will come off.

As described above, the determination means makes it seem that the resistance itself has changed as a result of the imitation of making each conduction state of each resistor correspond to the normal failure state or failure normal state of each self-diagnosis result output device. Therefore, the judgment method based on the change in the total resistance of the resistor circuit is effective, and the judgment means can be realized by the conventional fault location method described above or a simple method based on it. It becomes.
Therefore, according to the present invention, even if a plurality of self-diagnosis result output devices output self-diagnosis results as on / off signals, a resistance circuit in which resistors corresponding to each device are connected in series is connected to a diagnostic result transmission signal line. It is possible to realize a faulty device specifying system capable of transmitting a diagnosis result so that a faulty device can be specified with a small number of signal lines.

  Further, in the faulty device specifying system of the present invention (Solution means 2), the short circuit simulation circuit is configured by the relay contact that outputs the self-diagnosis result of the self-diagnosis result output device, so that the harsh environment The compatibility with the signal security equipment installed along the lower railway line is good, and an undesired increase in circuit scale can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a fault device identification system using a three-display information switching type ATS-P ground unit with a fault detection function as a self-diagnosis result output device for Embodiment 1 of the present invention. (A) is a circuit diagram of an energization circuit, and (b) is a table of determination criteria. It is a circuit diagram which shows the specific example of the determination means using a relay about Example 2 of this invention. (A) is a schematic block diagram of ground equipment of a conventional ATS-P system with a repeater failure detection function, (b) is a schematic block diagram of ground equipment of a conventional ATS-P (N) system with a telegram checking function, ( c) is a block diagram of a conventional ATS-P (N) ground unit with a telegraphic check function of a three-display information switching type. (A) is a block diagram of an ATS-P ground unit with a fault detection function of three display information switching type, (b) is a block diagram of a straight fault device identification system, and (c) is for direct diagnosis result transmission. It is a block diagram of a signal line sharing circuit. It is a block diagram of a known multi-drop wiring system capable of identifying a failed device.

About the faulty device identification system of such this invention, the specific form for implementing this is demonstrated by the following Examples 1-2.
The embodiment 1 shown in FIGS. 1 and 2 embodies the above-described solving means 1 and 2 (claims 1 and 2 as originally filed), and the embodiment 2 shown in FIG. Means 3 (claim 3 as originally filed) is embodied.
In the illustration, for the sake of simplicity, the mechanical structure, the details of the electric circuit, the details of the electronic circuit, etc. are omitted from the illustration, and the blocks mainly necessary for the explanation of the invention and related ones are shown. Shown in the figure.
Furthermore, since the same reference numerals are given to the same constituent elements as those in the past in the illustration thereof, and what is described in the background art section is also common to the following embodiments, it is not repeated. The description of this will be omitted, and the following description will focus on differences from the prior art.

A specific configuration of the failure device identification system according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a system in which an ATS-P ground element 30 with a fault detection function of three display information switching type is used as a self-diagnosis result output device. FIG. A circuit diagram of R1 + R2 + R3 + R4, and FIG.
This faulty device identification system (see FIG. 1) includes an instrument box 14 distributed along the track 11 and a plurality of ground elements 30 (only three are shown in FIG. 1 but the fourth one is also present). However, it is different from the conventional system in the following points.

  The main difference between the failure device identification system and the conventional system is that the relays NRM1 to NRM4 driven through the individual diagnostic result transmission signal lines 33 are short-circuit simulated for common use of the diagnostic result transmission signal lines. Common diagnosis that incorporates a resistor (R1 + R2 + R3 + R4) in which a plurality of resistors R1 to R4 having different resistance values are connected in series, and a relay (short circuit pseudo-simulator circuit) that is moved to the nearest connection box 35 of the ground element 30 As a result, the signal line 34 for transmission is routed across the instrument box 14 and each ground element 30, the point where the energizing circuit 36 for energizing the resistance circuit R1 + R2 + R3 + R4 is provided in the instrument box 14, and the voltage associated with the energization The determination means 37 is provided in the instrument box 14 for determining whether or not there is a failure related to the ground element 30 based on the current and for identifying the failure device when determining the failure.

  More specifically (see FIG. 1), the connection box 35 for the first (No. 1) ground element 30 is provided with a short-circuit dummy relay NRM1 and a resistor R1, and for the second (No. 2) ground element 30. The connection box 35 is provided with a short-circuit dummy relay NRM2 and a resistor R2, and the third (No. 3) connection box 35 for the ground element 30 is provided with a short-circuit dummy relay NRM3 and a resistor R3. The connection box 35 for the ground element 30 in FIG. 4) is provided with a short circuit dummy relay NRM4 and a resistor R4. The energization circuit 36 and the determination means 37 are provided in the instrument box 14. Each ground element 30 checks its own state and outputs a self-diagnosis result of normality or failure as a relay drive signal (on / off signal). Each relay drive signal is transmitted via a diagnostic result transmission signal line 33. As described above, the corresponding short circuit dummy relays NRM1 to NRM4 are operated.

  The energization circuit 36 (see FIG. 1 and FIG. 2A) plays a minimum role if, for example, there is a power supply line connecting the DC 24V power supply and the diagnostic result transmission signal line 34. The feedback line of the diagnostic result transmission signal line 34 wired separately from the DC0V feedback line for operating power supply of the child 30 is connected to the DC0V position. Such an energization circuit 36 grasps the voltage and current related to the energization as a physical quantity reflecting the change in the total resistance value of the resistance circuit R1 + R2 + R3 + R4 necessary for the determination. Although both the power supply voltage to the signal line 34 and the current I of the diagnostic result transmission signal line 34 may be measured, in this example, since the voltage is 24V and a known fixed value, the fluctuating current I is In order to grasp, a resistor Rv is inserted and connected to a 24V DC power supply line, and a voltage V which is a potential difference between both ends thereof is measured. The resistance Rv used for realizing such a current-voltage conversion function may be a small resistance, which is 100Ω in this example.

  The resistors R1 to R4 in the resistor circuit R1 + R2 + R3 + R4 need only have different resistance values when the simultaneous failure of the plurality of ground children 30 is not assumed. When all faulty devices are to be specified, all subsets having different total resistance values are selected. Here (see FIG. 2A), “R1 = 3 kΩ, R2 = 6 kΩ, R3 = 12 kΩ, R4 = 24 kΩ” is used under the condition that the ratio changes at a ratio of 2 or more. Among such resistors R1 to R4 (see FIGS. 1 and 2A), the relay contact of the short circuit dummy relay NRM1 is connected in parallel to the resistor R1, and the relay contact of the short circuit dummy relay NRM2 is connected to the resistor R2. The relay contact of the short circuit dummy relay NRM3 is connected in parallel to the resistor R3, and the relay contact of the short circuit dummy relay NRM4 is connected in parallel to the resistor R4.

The relay contacts connected in parallel to the resistors R1 to R4 are turned on or off according to the self-diagnosis result of the corresponding ground element 30, but here, any relay contact has a self-diagnosis result. When it is normal detection, it is in a conductive state, and when the self-diagnosis result is a failure detection, it is in a cut-off state, so that it functions as a short circuit simulation circuit.
In addition, the short circuit dummy relay NRM1 in the connection box 35 of the first (No. 1) ground element 30 is combined with a charge / discharge circuit having a time constant of, for example, about 60 ms, so that the short circuit dummy relay NRM1 can be ignored. Such a short-time failure detection, for example, a short-time mismatch in the verification circuit 31, power supply ripples, and other minute noises are not affected. The same is true for the other short circuit pseudo-relay relays NRM2 to NRM4, although the repeated explanation is omitted.

  The determination means 37 (see FIG. 2B) determines whether each of the ground elements 30 is normal or failed based on the known voltage 24V relating to the energization of the resistance circuit R1 + R2 + R3 + R4 and the measured voltage V corresponding to the current I, and the failure. At the time of determination, a faulty ground element is specified. Specifically, the total resistance (R + Rv + Rc) that determines the current I is obtained by adding the resistance Rv of the resistance circuit R1 + R2 + R3 + R4 to the resistance Rv of 100Ω and the cable resistance Rc of the diagnostic result transmission signal line 34, for example, 34.2Ω. When the resistors R1 to R4 are short-circuited (0Ω) short-circuited (0Ω) short-circuited (0Ω) short-circuited (0Ω), the total resistance is 134.2Ω, the current is 178.8 mA, and the voltage V is 17883.8 mV. When all of the resistors R1 to R4 are determined to be normal (3000Ω) short-circuited (0Ω) short-circuited (0Ω) short-circuited (0Ω), the total resistance is 314.2Ω, the current is 765.7 mA, and the voltage V is 765.7 mV. Thus, only the first (No. 1) ground element 30 is determined to be faulty by threshold discrimination and the like, and the description below will be omitted, but the fault ground element is specified by threshold determination of voltage V or the like.

  The use mode and operation of the faulty device identification system of the first embodiment will be described. A plurality of ground units 30 are installed along the same trajectory 11 as the information providing target traffic signal 13 and appropriately separated from other ground units 30 (see FIG. 1), their connection box 35 and the instrument box 14 of the traffic signal 13 Are connected by a cable as in the prior art, but the individual diagnostic result transmission signal line 33 for transmitting the failure detection result (self-diagnosis result) from the ground unit 30 to the connection box 35 is provided at the connection box 35. Since it is sufficient if the common diagnostic result transmission signal lines 34 are collected and included in the connection cable between the connection box 35 and the instrument box 14, the number of signal lines of the cable is smaller than the conventional number. In addition, the cable can be prepared without being influenced by the number of ground elements 30.

  Then, when the power is turned on and the supply voltage of DC 24V or DC 135V rises, each ground unit 30 generates a telegram to be wirelessly transmitted to the train 12 based on the signal indications GR, YR, etc., and self-diagnosis As a result output device, it checks whether its own state is normal or failure, and outputs a self-diagnosis result (failure detection result) as an on / off signal. Specifically, the first (No. 1) ground element 30 drives the short-circuit pseudo-regulation relay NRM1 at the end of the dedicated diagnostic result transmission signal line 33 according to the self-diagnosis result, and similarly the second (No. 1). 2), the third (No. 3) and the fourth (No. 4) ground element 30 respectively connect the short-circuit pseudo-regulation relays NRM2 to NRM4 of the dedicated diagnostic result transmission signal line 33 according to the self-diagnosis result. To drive.

  When all the ground elements 30 have self-diagnosed as normal, the relay contact of the short circuit dummy relay NRM1 parallel to the resistor R1 and the relay contact of the short circuit dummy relay NRM2 parallel to the resistor R2 are both shorted in parallel to the resistor R3. The relay contact of the pseudo relay NRM3 and the relay contact of the short-circuit pseudo relay NRM4 in parallel with the resistor R4 are all conductive, the resistance R becomes 0Ω, and the total resistance of the energization target circuit of the energization circuit 36 is 134.2Ω. (See FIG. 2B), the energization current I becomes 178.8 mA, the potential difference across the resistor Rv becomes 17883.8 mV, and this is measured as the voltage V. 30 are determined to be all normal, and the determination result is notified to the steady state monitoring device 15.

Further, for example, when the first (No. 1) ground element 30 is self-diagnosed and the other ground elements 30 are self-diagnosed, the relay contact of the short-circuit dummy relay NRM1 in parallel with the resistor R1 is in a disconnected state. On the other hand, the relay contacts in parallel with the other resistors R2 to R4 are all in a conductive state, and the voltage V of the resistor Rv becomes 765.7 mA (see FIG. 2B). It is determined that only the (No. 1) ground element 30 has failed.
Furthermore, for example, when the first (No. 1) and second (No. 2) ground elements 30 are self-diagnosed and the other ground elements 30 are self-diagnosed as normal, they are short-circuited in parallel with the resistors R1 and R2. While the relay contacts of the dummy relays NRM1 and NRM2 are cut off, the relay contacts parallel to the other resistors R3 and R4 are turned on, and the voltage V of the resistor Rv becomes 262.7 mA (FIG. 2B). It is determined that only the first (No. 1) and second (No. 2) ground element 30 has failed.

  In this way, explanation of other repeated failure situations is omitted, but if any of the four ground elements 30 from the first (No. 1) to the fourth (No. 4) fails, it will be Whether it is a failure or a plurality of simultaneous failures, all the failed ground elements 30 are identified by the determination means 37, and the determination result is notified to the steady state monitoring device 15.

  A specific configuration of the second embodiment of the failure device identification system according to the present invention will be described with reference to the drawings. FIG. 3 is a circuit diagram showing a specific example of the determination means 37 having a circuit configuration using a relay.

  In this fault device identification system, the determination means 37 generates a voltage corresponding to the energization state of the energization circuit 36 by amplifying the potential difference (voltage V) across the resistor Rv with an operational amplifier (Amp.). The voltage drives the discrimination relay ABN1 via a 2260Ω resistor, drives the discrimination relay ABN2 via a 760Ω resistor, drives the discrimination relay ABN3 via a 250Ω resistor, and via a 0Ω resistor Thus, the determination relay ABN4 is driven. The coil resistances of the discrimination relays ABN1 to ABN4 are all 800Ω, and four thresholds for dividing the voltage V are determined based on the resistance ratio between the resistances and the connection resistances. The voltage depends on the operating state of the four discrimination relays ABN1 to ABN4. This is divided into cases where V is 16.

  Further, such a case classification is converted into driving and operating states of the four failure presence / absence relays TRB1 to TRB4 by a logical operation circuit assembled at the relay contacts of the determination relays ABN1 to ABN4. Then, the failure presence / absence relay TRB1 performs an operation corresponding to the short circuit pseudo-regulation relay NRM1, and notifies the steady state monitoring device 15 of the failure detection result (self-diagnosis result) of the first (No. 1) ground element 30 by a relay contact signal. Similarly, the failure presence / absence relays TRB2, TRB3, and TRB4 perform operations corresponding to the short-circuit pseudo relays NRM2, NRM3, and NRM4, respectively, and perform second (No. 2), third (No. 3), and fourth (No. 4), the failure detection result of the ground element 30 is notified to the steady state monitoring device 15 by a relay contact signal. In this way, determination and identification are performed accurately, and the result is output from the determination means 37 as a relay signal and input to the steady state monitoring device 15.

[Others]
In the above embodiment, the resistors R1 to R4 and the short circuit dummy relays NRM1 to NRM4 are provided in the connection box 35 near the ground unit 30, but may be mounted integrally with the ground unit 30.
Further, in the above embodiment, as a specific example of the short circuit simulation circuit being in the cut-off state or the conduction state, the case where all the short circuit simulation circuits are in the conduction state at the time of normal detection and in the cut-off state at the time of failure detection is described. However, all of the short circuit simulation circuits may be turned off when normal detection is detected and may be turned on when failure is detected, or the correspondence relationship may vary depending on the respective short circuit simulation circuits. Even if it exists, there is no problem as long as the correspondence is appropriately reflected in the determination means. Note that the configuration in which the short circuit simulation circuit is in a conductive state when it is detected normally and shuts off when a fault is detected is compared to the configuration in which the short circuit simulation circuit is in a cutoff state when it is detected normally and is in a conductive state when a failure is detected. Thus, the power consumed by the resistor circuit in a steady state with no failure is small.

  The faulty device specifying system of the present invention is not limited to the above-described three-display information switching type ATS-P ground unit, but a fixed information type or other number of information switching type ATS with fault detection function. The present invention can also be applied to a -P ground unit, and can further be applied to a self-diagnosis result output device that checks whether the self-state is normal or faulty and outputs a self-diagnosis result with an on / off signal.

11 ... Track (railroad track), 12 ... Train (on-board equipment),
13 ... Traffic light, 14 ... Instrument box, 15 ... Steady state monitoring device,
20 ... Ground element, 21 ... Verification circuit,
30: Ground unit (self-diagnosis result output device), 31 ... Verification circuit,
32 ... Output circuit, 33 ... Diagnostic result transmission signal line (individual),
34 ... Signal line for transmission of diagnosis results (common), 35 ... Connection box,
36 ... energization circuit, 37 ... determination means,
NRM1-NRM4 ... Short-circuit pseudo relay, R1-R4 ... resistance (resistance circuit)

Claims (3)

A plurality of self-diagnosis result output devices for checking whether the state of the own device is normal or faulty and outputting a self-diagnosis result with an on / off signal, a resistance circuit in which a plurality of resistors having different values are connected in series, A plurality of short-circuit simulation circuits that are connected in parallel and are turned on or off according to the self-diagnosis result of any of the self-diagnosis result output devices, an energization circuit that energizes the resistance circuit, and energization thereof Determining whether the plurality of self-diagnosis result output devices are all normal or whether any of the plurality of self-diagnosis result output devices has a failure based on the voltage and current according to A failure device identification system comprising: a determination unit that identifies a failed device among the plurality of self-diagnosis result output devices at the time of determination.   2. The self-diagnosis result output device outputs a self-diagnosis result by a relay, and the short circuit simulation circuit performs switching of a conduction interruption state at a relay contact of the relay. Faulty device identification system.   The determination means includes a plurality of determination relays that are driven via a resistor at a voltage corresponding to the energization state of the energization circuit, and outputs a determination and a specific result as a relay signal. The faulty device specifying system according to claim 1 or 2, characterized in that the system is faulty.

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