JP3360757B2 - Transmission output monitoring circuit and transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission output monitoring circuit and, more particularly, to a transmission output of a transmitter which is abnormal and, when the transmission output is shut off, recovers when the abnormality is eliminated within a predetermined time. The present invention relates to a technique for preventing interruption due to a transient abnormality such as noise.

[0002]

2. Description of the Related Art Transmitters used in railway signal fields, for example, automatic train stop devices (hereinafter referred to as "ATS"), automatic train control devices (hereinafter referred to as "ATC"), etc. From the viewpoint of ensuring fail-safe, a transmission output monitoring circuit is provided. Such a transmission output monitoring circuit constantly monitors the transmission output signal supplied from the transmitter to the load, and when the transmission output signal is abnormal, shuts off the transmission output signal and holds the state. The transmission output monitoring circuit is released from the cut-off state by performing a manual reset operation after checking the transmitter to confirm that there is no abnormality.

A transmitter used in an ATS or the like has been digitized using a microcomputer in accordance with recent advances in digital technology.

[0004]

However, a transmission output monitoring circuit used in a conventional ATS or the like is designed to maintain a shut-off state even in the case of a transient abnormality due to noise or the like from the viewpoint of ensuring fail-safe. , The use efficiency of the transmitter is coming down. In particular, with the digitization of the transmitter, this point has become remarkable.

Accordingly, a first object of the present invention is to provide a transmission output monitoring circuit capable of solving the above-mentioned problems, automatically recovering from a temporary abnormality, and improving the use efficiency of a transmitter. It is.

A second object of the present invention is to provide a transmission output monitoring circuit capable of ensuring fail-safe performance even after automatic recovery.

[0007] A third object of the present invention is to provide a transmission apparatus capable of automatically recovering from a transient abnormality and improving the use efficiency of the transmitter.

[0008]

According to a first aspect of the present invention, a transmission output monitoring circuit includes a determination circuit, an output circuit, and a delay circuit. Monitoring the state of the transmission output signal supplied to the, the determination circuit, the transmission output signal of the transmitter,
A transmission command signal supplied to the transmitter is input, and a determination signal indicating “normal” or “abnormal” is output depending on whether the transmission output signal matches the transmission command signal. The output circuit receives the determination signal, transmits the transmission output signal when the determination signal is “normal”, holds the state, and when the determination signal is “abnormal”. The transmission output signal is cut off and the holding operation is released, and the delay circuit receives a delay start signal corresponding to the change of the determination signal from “normal” to “abnormal”, The output circuit outputs an off-delay return allowance signal, and the output circuit performs the holding operation again when the return allowance signal is input and the determination signal returns from “abnormal” to “normal”.

According to a second aspect of the present invention, there is provided a transmission output monitoring circuit according to a second aspect of the present invention, wherein the delay circuit outputs the return permission signal a plurality of times during a monitoring time. Stop output of

To solve the third problem, a transmitting apparatus according to a third aspect of the present invention includes a transmitter and a transmission output monitoring circuit, wherein the transmitter receives a transmission command signal,
The transmission output signal corresponding to the transmission command signal is output, and the transmission output monitoring circuit is as described above.

[0011]

The judgment circuit outputs a judgment signal which becomes "normal" when the transmission output signal of the transmitter and the transmission command signal supplied to the transmitter match, and the output circuit outputs the judgment signal. Since the transmission output signal is transmitted when "normal" and the state is maintained, a normal transmission output signal can be supplied to the load.

The determination circuit outputs a determination signal that becomes “abnormal” when the transmission output signal of the transmitter does not match the transmission command signal transmitted to the transmitter, and the output circuit outputs the determination signal. Since the transmission output signal is cut off and the holding operation is released when the status is "abnormal", it is possible to prevent the supply of the abnormal transmission output signal to the load.

The delay circuit receives a delay start signal corresponding to the change of the determination signal from "normal" to "abnormal" and outputs an off-delay return allowance signal. The output circuit receives the return allowance signal. And the holding operation is performed again when the judgment signal returns from "abnormal" to "normal". Therefore, if the abnormality of the transmitter is a transient abnormality that recovers within the off-delay time, For example, it is determined that the transmitter has returned to the normal state based on the return permission signal and the determination signal, and a normal transmission output signal can be supplied to the load again.
In addition, since it is confirmed that the transmitter has returned to the normal state and the cutoff state has been released, safety is maintained. As a result, a transmission output monitoring circuit capable of automatically recovering from a temporary abnormality and improving the use efficiency of the transmitter is obtained.

[0014] Further, the delay circuit may be operated a plurality of times during the monitoring time.
When the return allowance signal is output, the output of the return allowance signal is stopped. Therefore, it is difficult to determine the abnormality, and the periodic abnormality that appears to have returned to normal within a fixed time (off-delay time) is allowed. A transient abnormality is discriminated and detected based on the number of times the signal is generated. Therefore, after the output of the return permission signal is stopped, the automatic return is prohibited, and a transmission output monitoring circuit capable of ensuring fail-safe performance even when the automatic recovery is performed for a temporary abnormality can be obtained.

The transmitter outputs a transmission output signal corresponding to the transmission command signal, and the transmission output monitoring circuit is as described above. A transmission device that can improve the utilization efficiency can be obtained.

[0016]

FIG. 1 is a block diagram showing a configuration of a transmission output monitoring circuit and a transmission device according to the present invention. The transmission output monitoring circuit according to the present invention includes a determination circuit 1, an output circuit 2, and a delay circuit 3, and receives a load (orbit circuit) from an ATS transmitter 4.
5 to monitor the state of the transmission output signal S41.
The transmission output monitoring circuit can be constituted by a microcomputer, a relay circuit, and the like. FIG. 1 shows an image constituted by a relay circuit for convenience of explanation. Reference numeral 6 denotes a transmission command circuit which supplies a transmission command signal S61 to be transmitted to the ATS transmitter 4.

The determination circuit 1 receives the transmission output signal S41 of the ATS transmitter 4 and the transmission command signal S61 supplied to the ATS transmitter 4, and the transmission output signal S41 matches the transmission command signal S61. A determination signal S11 indicating "normal" or "abnormal" is output depending on whether or not to perform the determination. Also,
From the viewpoint of improving the determination accuracy, the determination can be made including the carrier frequency and the transmission level of the transmission output signal S41.

The output circuit 2 receives the judgment signal S11, transmits the transmission output signal S41 when the judgment signal S11 is "normal", holds the state, and holds the state, and the judgment signal S11 is "abnormal". Sometimes, the transmission output signal S41 is cut off and the holding operation is released.

In the delay circuit 3, the judgment signal S11 is "normal".
Start signal S corresponding to the change from
12 is input, and an off-delay return allowance signal S31 is output. The off-delay time varies depending on the monitoring target, but is set to 6 seconds to 12 seconds in the present embodiment.

The output circuit 2 performs the holding operation again when the return permission signal S31 is input and the determination signal S11 returns from "abnormal" to "normal".

As described above, the determination circuit 1 determines that the state is “normal” when the transmission output signal S41 of the ATS transmitter 4 matches the transmission command signal S61 supplied to the ATS transmitter 4. The signal S11 is output, and the output circuit 2
Transmits the transmission output signal S41 when the determination signal S11 is “normal” and holds the state,
A normal transmission output signal S41 can be supplied to the load 5.

The decision circuit 1 outputs a decision signal S11 which becomes "abnormal" when the transmission output signal S41 of the ATS transmitter 4 does not match the transmission command signal S61 transmitted to the ATS transmitter 4. , The output circuit 2 outputs the determination signal S11
When the signal is “abnormal”, the transmission output signal S41 is cut off and the holding operation is released, so that the supply of the abnormal transmission output signal S41 to the load 5 can be prevented.

The delay circuit 3 determines that the determination signal S11 is "normal".
Start signal S corresponding to the change from
12, the output circuit 2 outputs an off-delay return allowance signal S31, and the output circuit 2 performs the holding operation again when the return allowance signal S31 is input and the determination signal S11 returns from "abnormal" to "normal". If the abnormality of the ATS transmitter 4 is a transient abnormality that recovers within the off-delay time, the ATS transmitter 4 returns to normal by the return permission signal S31 and the determination signal S11. It is determined that the normal transmission output signal S
41 can be supplied. In addition, since the ATS transmitter 4 confirms that the ATS transmitter 4 has returned to the normal state and releases the cutoff state,
Safety is also maintained. As a result, a transmission output monitoring circuit capable of automatically recovering from a temporary abnormality and improving the use efficiency of the ATS transmitter 4 is obtained.

FIGS. 2 and 3 are time charts for specifically explaining the operation of the transmission output monitoring circuit according to the present invention.
FIG. 2 shows a case where the abnormality of the ATS transmitter recovers within the off-delay time, and FIG. 3 shows a case where the abnormality of the ATS transmitter does not recover within the off-delay time. First, FIG.
2 will be described with reference to FIG.

At time t1, transmission command signal S61
Commands a speed limit of 30 km / h. ATS transmitter 4
Responds to the transmission command signal S61 at the speed limit of 30 km / h,
A frequency signal having a frequency of 80 Hz is output as a transmission output signal S41. The determination circuit 1 verifies that the transmission command signal S61 is at the speed limit of 30 km / h and that the frequency of the transmission output signal S41 is 80 Hz, and outputs a determination signal S11 that becomes "normal". The output circuit 2 transmits the transmission output signal S41 and holds the state.

At time t2, the ATS transmitter 4 breaks down and supplies the load 4 with a transmission output signal S41 having a frequency of 15 Hz, which means that the traveling speed is free. At time t3, the determination circuit 1 outputs a determination signal S11 indicating “abnormal”. The output circuit 2 cuts off the transmission output signal S41 and releases the holding operation. The load 5 enters a no-signal state. In response to the change of the determination signal S11 from “normal” to “abnormal”, a delay start signal S12 is obtained. Time t
In 4, the delay circuit 3 outputs an off-delay return allowance signal S31.

At time t5, the ATS transmitter 4 recovers from the fault and transmits the transmission output signal S41 having a frequency of 80 Hz.
Is output. At time t6, the determination circuit 1 is “normal”
A determination signal S11 is output. The output circuit 2 receives the return permission signal S31 and returns the determination signal S11 to “normal”, so that the AND condition is satisfied, the transmission output signal S41 is transmitted, and the holding operation is performed again.

Next, FIG. 3 will be described with reference to FIG. The operation from time t1 to t4 is the same as in FIG.
At time t7, the delay circuit 3 ends the off-delay and stops the return allowance signal S31. Thereafter, since the delay circuit 3 does not output the return allowance signal S31 within the monitoring time, the output circuit 2 maintains the transmission output signal S41 in a cut-off state.

When the delay permitting signal S31 is output a plurality of times during the monitoring time, the delay circuit 3 of the embodiment of FIG. 1 stops outputting the return permitting signal S31. For this reason,
The periodicity abnormality which seems to be normally restored within the off-delay time, in which the abnormality is most difficult to determine, is determined by the return allowance signal S
Based on the number of occurrences of 31, it is distinguished and detected as a transient abnormality. Therefore, after the output of the return allowance signal S31 is stopped, the automatic return is prohibited, and a transmission output monitoring circuit capable of ensuring fail-safe performance even if the automatic return is performed for a temporary abnormality can be obtained.

The delay start signal S12 is a decision signal S11. Therefore, the delay circuit 3 starts off-delay immediately after the determination signal S11 changes from “normal” to “abnormal”. Therefore, when the ATS transmitter 4 is configured by a microcomputer and configured to automatically return after confirming that there is no abnormality by self-diagnosis, the self-diagnosis time and the off-delay time are set to a fixed relationship. Do
For example, when the two are matched, a transient abnormality in which the transmission output signal S41 is garbled due to noise is distinguished from an abnormality due to runaway of software, and the reliability of automatic recovery can be improved.

The delay start signal S12 is output from the output circuit 2
Corresponds to the release state of the holding operation. For this reason, even when the output circuit 2 is configured by a relay circuit and the holding operation is canceled only due to the momentary interruption of the power supply or the like, the return allowance signal S31 is output immediately after the holding operation is canceled, and the output The circuit 2 can perform the holding operation again.

The output circuit 2 of the embodiment has a self-holding relay C
Contains HR. The self-holding relay CHR has at least two output contacts CHR1, CHR2. The first output contact CHR1 is connected in series to the self-holding relay CHR to form a self-holding circuit. The second output contact CHR2 is for transmitting or blocking the transmission output signal S41. The determination circuit 1 outputs a determination signal S11 in which the output voltage becomes 24 volts when the determination result is “normal” and becomes 0 volt when the determination result is “abnormal”. The delay circuit 3 receives an initialization signal S13 for initializing the output circuit 2 to the self-holding state, and the output contact CLR1 is turned on. Therefore, the output circuit 2 activates the self-holding relay CHR via the output contact CLR1 by the determination signal S11, and outputs the first output contact CHR1 and the second output contact CHR.
2 conducts, and transmits the transmission output signal S41 to the load 5, while maintaining that state, and becomes the self-holding state. When the determination signal S11 becomes “abnormal”, the power supply to the self-holding relay CHR is stopped, and the output circuit 2 is released from the self-holding state.

FIG. 4 is a specific circuit diagram of the delay circuit shown in FIG. Delay circuit 3 includes a first relay TMR, a charging / discharging circuit 331, and a second relay CLR.
Reference symbols CHR3 and CHR4 are self-holding relays CHR.
Output contact. The output contact CHR3 is a “lifting” contact that conducts when the self-holding relay CHR is excited, and the output contact CHR4 is a self-holding relay C
A "falling" contact that conducts when the HR is not energized. The output contact CHR3 is connected to the first relay TMR.
Are connected in series. The first relay TMR and the charging / discharging circuit 331 are connected in parallel, and the output contact CHR3
Are connected in series. The charge / discharge circuit 331 is configured by a series circuit of a capacitor C1 and a resistor R1.
Therefore, when the output contact CHR3 is “lifting”, the charging / discharging circuit 331 is charged and the first relay TMR is excited. When the output contact CHR3 falls, the delay start signal S12 is output and the first relay T
The MR is excited by the discharge charge of the capacitor C1 of the charge / discharge circuit 331. The first relay TMR is a charge / discharge circuit 3
The discharge contact 31 operates as an off-delay, and the output contact TMR1 "falls" with a delay of the off-delay time. The second relay CLR is connected in series to the output contact TMR1 and the output contact CHR4, and only when the self-holding is released, is the return permission signal S31 from the output contact CLR1.
Is output. When the judgment circuit outputs the judgment signal S11 to be “normal” while the output contact CLR1 is outputting the return allowance signal S31, the self-holding relay CHR is excited via the output contact CLR1, and the output circuit 2 is restarted. Perform self-holding.

In the charge / discharge circuit 331, the charging time constant is set shorter than the discharging time constant. The charge / discharge circuit 331
A series circuit mainly composed of the capacitor C1, the diode D1 and the resistor R2 forms a charging circuit, and the capacitor C1 and the resistor R2
One series circuit constitutes a discharge circuit. The resistance value of the resistor R2 is set smaller than the resistance value of the resistor R1. Therefore, the off-delay can be reliably obtained even when the return allowance signal S31 is output a plurality of times.

In the embodiment, the first relay TMR and the series circuit of the capacitor C1 and the resistor R1 operate directly according to the judgment signal S11 of the judgment circuit 1, and the first relay TMR
The MR operates without being affected by the charge of the capacitor C1. For this reason, the charging / discharging circuit 331 includes the capacitor C1
Is sufficiently charged and the off-delay time is short, the series circuit of the diode D1 and the resistor R2 can be omitted.

When the reset switch RS is turned on, the second
Is energized, the self-holding relay CHR is energized via the contact CLR1, and the output circuit 2 performs self-holding. A contact (not shown) for automatically holding the output circuit 2 when the transmission output monitoring circuit rises is connected in parallel to the reset switch RS.

The transmitting apparatus according to the present invention will be described with reference to FIG. The transmission device includes a transmitter 4 and a transmission output monitoring circuit. The transmission output monitoring circuit includes the above-described determination circuit 1, output circuit 2, and delay circuit 3.

The transmitter 4 outputs a transmission output signal S41 corresponding to the transmission command signal S61. Since the transmission output monitoring circuit is as described above, it automatically recovers from a transient abnormality, A transmission device capable of improving the use efficiency of the transmitter is obtained.

[0039]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a transmission output monitoring circuit capable of automatically recovering from a transient abnormality and improving the use efficiency of the transmitter. (B) It is possible to provide a transmission output monitoring circuit capable of ensuring the fail-safe property even after automatic recovery. (C) It is possible to provide a transmission device capable of automatically recovering from a temporary abnormality and improving the use efficiency of the transmitter.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transmission output monitoring circuit and a transmission device according to the present invention.

FIG. 2 is a time chart for specifically explaining the operation of the transmission output monitoring circuit according to the present invention, showing a case where the abnormality of the transmitter recovers within the off-delay time.

FIG. 3 is a time chart for specifically explaining the operation of the transmission output monitoring circuit according to the present invention, showing a case where the abnormality of the transmitter does not recover within the off-delay time.

FIG. 4 is a specific circuit diagram of the delay circuit shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Judgment circuit 2 Output circuit 3 Delay circuit 4 Transmitter (ATS transmitter) 5 Load (track circuit) S11 Judgment output signal S12 Delay start signal S13 Initial setting signal S31 Return permission signal S41 Transmission output signal S61 Transmission command signal

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B61L 3/12

Claims (8)

(57) [Claims] 1. A transmission output monitoring circuit that includes a determination circuit, an output circuit, and a delay circuit, and monitors a state of a transmission output signal supplied from a transmitter to a load, wherein the determination circuit includes the transmission circuit. The transmission output signal of the transmitter and the transmission command signal supplied to the transmitter are input, and the status becomes “normal” or “abnormal” depending on whether the transmission output signal matches the transmission command signal. The determination circuit outputs a determination signal, wherein the output circuit receives the determination signal, transmits the transmission output signal when the determination signal is “normal”, holds the state, and outputs the determination signal. When the signal is “abnormal”, the transmission output signal is cut off and the holding operation is released. The delay circuit is configured such that the determination signal is changed from “normal” to “abnormal”.
A delay start signal corresponding to the change in the input is input, and a return permission signal for off-delay is output. The output circuit receives the return permission signal, and
A transmission output monitoring circuit that performs a holding operation again when the determination signal returns from “abnormal” to “normal”. 2. The method according to claim 1, wherein the delay circuit is provided a plurality of times during a monitoring time.
2. The transmission output monitoring circuit according to claim 1, wherein when the return permission signal is output, the output of the return permission signal is stopped. 3. The transmission output monitoring circuit according to claim 1, wherein the delay start signal is the determination signal. 4. The transmission output monitoring circuit according to claim 1, wherein the delay start signal corresponds to a release state of the holding operation. 5. The self-holding circuit, wherein the output circuit includes a self-holding relay, wherein the self-holding relay has at least two output contacts, and wherein the first output contact is connected in series to the self-holding relay. 5. The transmission output monitoring circuit according to claim 1, wherein the second output contact transmits or blocks the transmission output signal. 6. 6. The charge / discharge circuit, wherein the delay circuit includes a first relay, a charge / discharge circuit, and a second relay, wherein the first relay and the charge / discharge circuit are connected in parallel, and Starts discharging in response to the delay start signal, and the output contact of the first relay outputs the off-delay return allowance signal according to the discharging time constant of the charging / discharging circuit;
6. The transmission output according to claim 5, wherein an output contact of the first relay is connected to an output contact of the first relay, and an output contact of the second relay is connected in parallel to the first output contact of the self-holding relay. 7. Monitoring circuit. 7. The transmission output monitoring circuit according to claim 6, wherein the charging / discharging circuit is charged when the determination signal is “normal”, and a charging time constant is set shorter than the discharging time constant. . 8. A transmission device including a transmitter and a transmission output monitoring circuit, wherein the transmitter receives a transmission command signal and outputs a transmission output signal corresponding to the transmission command signal. A transmission device comprising the transmission output monitoring circuit according to any one of claims 1 to 7.