JPS5937270B2 - Train detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention detects trains within the block by applying a so-called check-in/check-out method to both ends of the block, which consists of a plurality of consecutive block sections, and detects trains within the block. This relates to a train detection method that only detects the presence of trains in each block section and compares the number of detected trains with the number of trains detected at both ends of the block, which reduces equipment costs and is also fail-safe. The purpose is to provide a detection method.

For example, there is a so-called check-in/check-out method for detecting trains that use rubber tires for the wheels of the vehicles running on the track, such as the Morrail train.

An overview of this type of method will be explained using an example shown in FIGS. 1 to 3. In FIG. 1, there are block sections IT and 2T on a train running route T between stations A and B.

When providing 3T, loop coils 1a, 1b, 2a, 2b are provided at the boundaries of each section as shown in the figure.

3a, 3b, 4a, 4b, loop coil la,
2a, 3a, and 4a have the oscillating frequency fO of the oscillator SO.
The signal is modulated intermittently by a modulator M using F signals generated by a rectangular wave signal generator SF, and then transmitted.

Further, the train C traveling on the running route T transmits a frequency signal f1 to the ground from the front part via the on-board antenna A1, and transmits a frequency signal f2 from the rear part to the ground via the on-board antenna A2.

A receiving circuit as shown in FIG. 2 is connected to each of the loop coils 1b, 2b, 3b, and 4b on the ground.

That is, loop 1b includes a receiving circuit I TOUT for detecting train departure in block section 1T, loop 2b includes a receiving circuit for train entry 1TIN in section 1T and train departure 2TOUT in section 2T, and similarly, loop 3b includes 2TIN, 3TOUT,
A 3TIN receiving circuit is connected to the loop 4b.

Fig. 2 is a block diagram of a receiving circuit connected to loop 2b, taking the boundary between block sections 1T and 2T as an example. IBPF is a bandpass filter that passes frequencies fO to f1, ■L is a limiter, and 2BPF is a block diagram of a receiving circuit connected to loop 2b. A bandpass filter that passes the frequency f2, lAM is an amplifier, and the signals that pass through the detection, level detection, amplification, and rectification circuits respectively are sent to the train entry detection relay 1TINR in section 1T or the train departure detection relay 2TOUTR in section 2T. Drive each.

FIG. 3 is an operation chart of the train entry or departure detection relay in each section when the train C passes from section 3T to section 2T and proceeds to section 1T.

That is, section 2T. 1T train approach detection relay 2TIN
R and ITINR are normally operated by the frequency signal fO induced from loop 3a to 3b or from loop 2a to 2b, but when train C passes over loop 3b, signal f1 from onboard is superimposed on the receiving circuit. Then, the space part of the intermittent modulated wave of terrestrial transmission is distorted as signal f1,
Due to the limiter operation of the circuit, the detection output disappears and 2TI
NR is restored and detects that the train has entered section 2T.

Then, when the tail of train C passes over loop 3b, train departure detection relay 3 in section 3T is activated by receiving on-board signal f2.
TOUTR operates and detects train departure from section 3T.

Similarly, when train C passes over loop 2b, it is detected that the train has proceeded from section 2T to 1T by the restoration of train entry detection relay 1TINR in section 1T and the operation of train departure detection relay 2TOUTR in section 2T.

Specifically, the condition that the train entered the block section in front is also included to indicate that the train has left the block section.

As described above, in the conventional method, trains are detected for each block section, the number of trains existing in the block section is counted by a reversible counter of a relay, and backward train control is performed using the output.

Such a circuit has been put into practical use and has been confirmed to be fail-safe, with almost no failures that would indicate the absence of a train even if there is a failure of on-board equipment, ground equipment, or cables.

However, as mentioned above, in the conventional method, similar equipment is installed for each block section, resulting in high equipment costs per block.

In future transportation systems for new urban transportation, etc., the intervals between vehicles will become shorter and the number of blocked sections will increase, making the equipment as a whole more expensive.

Therefore, there has been a demand for a low-cost, fail-safe circuit.

The present invention configures a plurality of consecutive block sections into one block, and performs train detection at both ends of the block using the conventionally used fail-safe check-in/check-out method to calculate the number of trains existing in the block. At the same time, in each block section within the block, signals from onboard the train are received by loop coils laid over each section to detect trains in each section, and the total number of detected trains and the blocks This is a train detection method that generates train presence information only when the count value and the count value match, and when they do not match, it is set as a condition that the train is present in the fully blocked section.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a block section IT of the same traveling route T as in FIG. 1.

A configuration diagram when implementing the method of the present invention on 2T and 3T,
Sections IT, 2T, and 3T together constitute one block, and loop coils 1a and ib, 4a and 4b are installed at both ends of the block.
is the same check-in/check-out loop coil as in Fig. 1.

Therefore, the oscillator SO1, the square wave generator SF, and the modulator M are also the first
Similar to the figure, a frequency signal fO that is intermittently modulated with a rectangular wave F is transmitted to the loop coils 1a and 4a, and the loop coil 4a
The signal fO guided from 4b to 4b is guided to the train entry into the 8-B station block, that is, to the IN receiving circuit.

Next, in the case of this method, block sections IT and 2T.

A loop coil 111 extending over each section length for each of the 3T.
21! , 31 are installed, and from the train C, a frequency signal f1 for on-board transmission is transmitted to the loop coil 11.21.311 on the ground via the on-board loop antenna Al.

The fl received by the loop coil 'I1.21.311 is guided to the train detection receiving circuits of sections IT, 2T, and 3T, respectively.

Furthermore, when the signal f1 is received by the loop coil 1b, A-
The train leaves the block between stations B, that is, is guided to the OUT receiving circuit.

Fig. 5a shows the reception circuit of the loop coil 1l, :l, 31, which passes the frequency signal f1 through a bandpass filter 3BPF or less, amplification, level detection, amplification, rectification circuits, and the reception circuit of the loop 31. The signal is relay 3TBR,
The received signal of loop 21 drives relay 2 TBR, and the received signal of loop 11 drives relay ITBR.

Therefore, the output via the recovery contact of each relay indicates the train absence information for the corresponding block section.

The diagram shows a train counter C that receives the train absence information as input.
Inverse addition/subtraction calculation output can be obtained by increasing/decreasing input information in the input/output circuit 1.

Figure 6a shows Chetzfin in the block between A and B stations.
The checkout receiving circuit detects the train approaching the terminal, that is, the IN receiving circuit passes the frequency signals fO to f1 through the bandpass filter IBPF1, the limit circuit below 1L detection, level detection, amplification, rectification circuits, and the train entry detection relay INR. Therefore, the separation from the feedback circuit, that is, the OUT receiving circuit is a bandpass filter 3B that passes the frequency signal f1.
Consists of PF and below amplification, detection, level detection, amplification, rectification circuits, and train departure detection relay 0UTR.

The figure shows the input/output circuit of the train counter C2, which counts the number of trains in a block and consists of an addition/subtraction circuit, and relays INR, 0U that indicate the absence of trains in the block.
The output via the operating contact of TH is input, and the counted value is output by adding and subtracting the two theoretical values.

A in Figure 7 is a comparison circuit for the count values of train counters C1 and C2, and only when the comparator CP compares them and they match, the relay CH is
Run R.

The figure shows a train detection condition circuit constructed in a fail-safe manner by combining the operating conditions of the relay CHR and the train detection conditions for each block section.

Figure 8 is a time chart showing the operating status of each part of the circuit from the time when three trains enter and leave the block between Station A and Station B, and A in the same figure is an operation chart of relay INH.
'J C-0UTH operation chart, H is relay IT
BR, 2 is relay 2 T B R, ho is relay 3 TBR
are operation charts showing the changes in the train count values of the train counter C1 and the train counter C2, respectively.

Although the drawings have been explained above, this method is
The checkout method is set to the individual exit of the block with the required multiple block sections, and the number of trains in that block is fail-safely measured using the same method as before, and the train control in the rear of the block is also performed. For each block section used, a frequency signal of fl (this signal is also used as a block check-in/check-out signal) is sent from the train to the ground loop coil installed for each section over the length of the section. A receiving circuit provided for each ground loop operates the relay by receiving the signal.

This relay checks which block section the train is in, and the check status is measured by a counter.

However, this circuit may detect the absence of a train even if it is present in the event of a circuit failure.

Therefore, on the one hand, the check relay CHR, which operates only when the number of trains measured by the check-in/check-out signal matches the number of trains measured by the train detection circuit for each block section, is operated, as shown in Fig. 7. Construct a conditional circuit for train detection as shown.

The number of trains measured by the check-in/check-out circuit does not count the number of trains less, so if the train detection system for each block section that is not fail-safe erroneously counts the number of trains less, the check relay CHR will be restored.

In that case, by setting the condition that there is a train in each block section using the circuit shown in FIG. 7, it is possible to maintain failsafe across the entire block.

As described above, the method of the present invention treats a plurality of block sections as one block, applies the check-in/check-out method to both ends of the block, and at the same time employs simple train detection using loop coils for each intermediate block section. Therefore, when the method of the present invention is applied, the circuit configuration becomes simple and the equipment cost of the entire device can be significantly reduced, which is an excellent effect.

In addition, the method of the present invention constantly compares and verifies the number of trains present in an l block detected by the check-in/check-out method, which itself has fail-safe properties, with the total number of trains present or absent detected for each block section. Since the system is monitored in a dual system, it has the excellent effect of further improving fail-safe properties and reliability.

[Brief explanation of the drawing]

Fig. 1 is an example diagram showing the equipment outline of the conventional check-in/check-out type train detection method, Fig. 2 is a block diagram of the same receiving circuit 1, Fig. 3 is a time chart for explaining the train detection operation as above, FIG. 4 is a schematic diagram of equipment for implementing the train detection method of the present invention. Fig. 5a is a block diagram of a receiving circuit for each block section, Fig. 6a is a block diagram of a receiving circuit for check-in/check-out according to the present method; The same figure shows a circuit diagram of a counter for counting the number of trains based on the received output as above, FIG. It is a chart for explaining operation of train detection by. I T, 2T, 3T...Block section, 1a, 1
b. 4a, 4b...Check-in/check-out ground loop coil, 111,211.31!・・・・・・
...Ground loop coil, fl...Onboard frequency signal, ITB, R2TBR, 3TBR...Receiving relay, ■NR...Intrusion detection relay in the home, 0TUR・・・Block departure detection relay, C
1, C2... Counter, CP... Comparator, CHR... Check relay.

Claims (1)

[Claims] 1 Configure the required multiple continuous block sections into one block, and receive signals from onboard trains at the entrance and exit ends of the block to check whether trains are entering the block or leaving the block. The in-checkout method is used to count the number of trains existing in the l-block, and the signal from the train is received by a loop coil installed in each block section in the l-block. Detect the presence of a train for each block section, calculate the total number of detected trains in each block section, compare and match the total number of detected trains with the counted number of trains present in one block, and when the two match. Outputs train presence information only to
A train detection method characterized in that, when there is a discrepancy, information indicating that a train is present in all of the block sections within the one block is outputted.