JPH032455Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a vehicle detection device that detects the presence of a vehicle on an uninsulated track circuit.

[Prior art]

In uninsulated track circuits made up of uninsulated rails, a voltage power transmission/reception method is often used for the purpose of detecting the presence of vehicles. A detection signal transmitter is connected to one end to transmit a detection signal for vehicle detection between the rails, and a detection signal receiver is connected to the other end of the block section to receive the detection signal voltage between the rails. When a vehicle enters the same section, an axle short circuit occurs between the rails, and the detection signal voltage between the rails decreases, and this is used to detect that a vehicle has entered the same section. It's summery.

However, in the conventional configuration, since the track circuit is composed of uninsulated rails, even if a vehicle exists in a block section adjacent to the block section to be detected, the vehicle will not approach the boundary between the two sections. For example, the effect of an axle short circuit spreads to the block section where detection is to be performed, resulting in a situation similar to when a vehicle is present in the same section, resulting in the disadvantage that the boundaries for vehicle detection are unclear.

[Summary of the idea]

The present invention has the purpose of eliminating such drawbacks of the conventional technology at once, and uses the above-mentioned voltage power transmission/reception type vehicle detection device to transmit an on-vehicle signal of a frequency different from that of the detection signal to the rail. , connect impedance elements for passing on-board signals near each end of the block section and between the rails, and connect receivers for receiving on-board signals near each end of the same section and between the rails, An extremely effective vehicle detection device for uninsulated track circuits, which forms a receiving loop for onboard signals only at This is what we provide.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing embodiments.

Figure 1 is a block diagram of the entire configuration, in which an uninsulated track circuit (hereinafter referred to as track circuit) 3 consisting of uninsulated rails (hereinafter referred to as rails) 1 and 2 is divided into multiple block sections (hereinafter referred to as sections) 2T to 5T. It is assumed that the vehicle V is moving from the left to the right in the figure, and each section 2T~
At each end of 5T, that is, at each boundary, _{there is a} capacitor C that forms a series resonant circuit for rails 1 and 2.
The primary sides of matching transformers MT _3a to _{MT 5a} are connected via C _5a and inductance wire rings L ₃ to _{L 5} , and the secondary sides of these and the primary sides of matching transformers MT _3b to _{MT 5b} are connected via cables. CB ₃ to CB ₅ are connected to each other, and a detection signal transmitter DTX is connected to the secondary side of the matching transformer MT _4b .
A detection signal for vehicle detection using an AC signal of a specific frequency is transmitted from the boundary between sections 3T and 4T to between the rails 1 and 2 of both sections 3T and 4T.

In addition, between the other end side boundaries of sections 3T and 4T, detection signal receivers 3TRX and 4TRX are connected to the secondary sides of matching transformers MT _3b to MT _5b , and these detect signals between rails 1 and 2. Receives signal voltage and operates relays 3TR and 4TR based on the received output.
Relays 4TR and 3TR are restored in response to a drop in the detection signal voltage due to an axle short circuit when vehicle V enters sections 4T and 3T, thereby detecting the entry of vehicle V into sections 4T and 3T. It has become a thing.

In addition, the detection signal receivers 3TRX and 4TRX are connected in parallel with the same receivers 2TRX and 5TRX, respectively, and the sections 2T and 5TRX are connected from the detection signal transmitter (not shown in the figure) to
Receives a detection signal of another frequency transmitted to 5T,
Each of them drives relays 2TR and 5TR, and when these are restored, entry of vehicle V into sections 5T and 2T is detected in the same manner as described above.

The above constitutes a voltage power transmission/reception type vehicle detection device, but in addition to this, in Fig.
On the vehicle V, there is an on-board transmitter VTX that sends out an on-board signal with a higher frequency than the detection signal used for each section 2T to 5T, and its output is transmitted to at least the rails 1 and 2.
An antenna ANT is provided to transmit signals to either of the sections 2T to 5, and is used to constantly transmit on-board signals to the rail circuit 3.
Capacitors C _3b to C _5b each having a smaller capacity than the capacitors C _3a to _{C 5a} are bridge-connected as impedance elements between the rails 1 and 2 near each boundary of T. Capacitors C _3a to C _5a and inductance wire L ₃ are designed to pass the upper signal but block the detection signal, and have a resonant frequency that matches the frequency of the detection signal.
~ For each series circuit with L ₅ , capacitor C _3b ~ _{C 5b}
Capacitors C _3c to _{C 5c} similar to the above are each connected in parallel to bypass the on-board signal.

Also, at each boundary of each section 2T to 5T, the receiver 2 is connected to each of the secondary sides of the matching transformers MT _3b to _{MT 5b} .
VRX to 4VRX are connected, and these receive on-board signals generated between the rails 1 and 2, and the received outputs drive the relays 2R to 4R individually.

In addition, ATC transmitters 3ATX to 5ATX that transmit ATC (Automatic Train Control) signals are connected to the secondary sides of matching transformers MT _3b to MT _5b , respectively, and are provided by the circuit described later.
The ATC signal is amplified and transmitted every section 3T to 5T.

Therefore, the one shown in FIG. 1 operates as a vehicle detection signal of the voltage power transmission/reception method, and also connects the capacitors C _3b to C _5b , C _3c , C _5c and matching transformers MT _3a to
The primary winding of MT _5a forms a receiving loop for on-board signals at each boundary between sections 2T to 5T, and when a vehicle V enters this loop, receivers 2VRX to 4VRX receive onboard signals. The signal is received, and the relays 2R to 4R operate accordingly, so that each section 2T
It is detected that the vehicle V has arrived at the boundary between 5T and 5T.

FIG. 2 is a diagram showing the operating status of each relay corresponding to FIG.
Even if it is outside the section to which it belongs, it will be restored up to the distance corresponding to the front and back due to the presence of vehicle V, and will be able to reach each boundary of the set sections 2T to 5T and relay 5TR,
Although an error occurs in the detection boundary indicated by the restoration of 4TR and 3TR, the operations of relays 4R, 3R, and 2R that respond to onboard signals completely correspond to the receiving loop in Figure 1. Each section 2T ~
This accurately indicates that the vehicle V has reached each boundary of 5T.

FIG. 3 is a circuit diagram of a logic circuit that detects vehicles in sections 2T to 4T based on the operating status of each relay.
2TSR is provided, and the recovery contacts 4TR ₁ of relays 4TR, 3TR, and 2TR respond to the detection signal of the self section.
3TR ₁ , 2TR ₁ and relays 4R, 3 that respond to the on-board signal received at the rear boundary of its own section.
Detection relays 4TSR, 3TSR, 2 are activated by series circuits with operating contacts 4R ₁ , 3R ₁ , 2R ₁ of R and 2R.
In addition to driving the TSR, these operating contacts 4
Due to TSR ₁ , 3TSR ₁ , 2TSR ₁ , contact 4TR ₁ ,
Self-holding is performed via 3TR ₁ and 2TR ₁ , and when relays 4TR, 3TR, and 2TR are restored and relays 4R, 3R, and 2R operate, detection relays 4TSR, 3TSR, and 2TSR are activated. It operates for the first time and remains in operation until relays 4TR, 3TR, and 2TR operate again.

Therefore, detection relays 4TSR, 3TSR, 2
The operation of the TSR accurately indicates the period from when a vehicle enters its own section until it completely advances to the section ahead, and can be used to properly block the own section.

Figure 4 shows the ATC transmitters 3ATX and 4 in Figure 1.
ATX and ATC transmitter 2ATX for section 2T, which is omitted in Figure 1, are used for block control.
It is a circuit diagram of a circuit that sequentially gives an ATC signal Sa,
Each switching contact of detection relays 2TSR to 4TSR 2TSR ₂
~ Connect 4TSR ₂ in series chain, contact 2TSR ₂
At the same time as supplying the ATC signal Sa from the parent pole of contact 4TSR ₂ , connect the termination resistor Rd to the recovery side child pole of contact 4TSR 2, and connect the active side child pole of each contact 2TSR ₂ to 4TSR ₂ to each
It is connected to the inputs of ATC transmitters 2ATX to 4ATX, respectively, and transmits ATC signals to sections 2T to 3T, respectively, according to the operation of detection relays 2TSR to 4TSR.

However, the frequency of the on-board signal only needs to be different from the detection signal of each section. Accordingly, the capacitors C _3b to _{C 5b} may be replaced with wave generators, etc., or they may be matched with the capacitors C _3b to C _5b . The same effect can be achieved by configuring a series resonant circuit for on-board signals with the primary winding inductance of the transformers MT _3a to _{MT 5a} , and depending on the situation, the capacitors C _3a to _{C 5a} and C _3c to _{C 5c} , inductance wire L ₃ ~ _{L 5} and matching transformer MT _3a
~MT _5a , MT _3b ~MT _5b , etc. are omitted, and receiver 2
Various modifications are possible, such as forming a reception loop for on-vehicle signals using the input impedances of VRX to 4VRX.

[Effect of idea]

As is clear from the above explanation, according to the present invention, it is possible to accurately detect the arrival of a vehicle at the boundary of a section, and the boundary for detection becomes clear, so it is highly effective in detecting vehicles on uninsulated track circuits. is obtained.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a block diagram of the entire configuration, Figure 2 is a diagram showing the operating status of each relay according to the progress of the vehicle, and Figure 3 is a diagram of the logic circuit that drives the detection relay. Circuit Diagram FIG. 4 is a circuit diagram of a circuit that supplies an ATC signal. 1, 2...Rail (non-insulated rail), 3...Track circuit (non-insulated rail circuit), 2T to 5T...section (block section), V...vehicle, VTX...on-vehicle transmitter,
ANT...Antenna, C _3b to _{C 5b} ...Capacitor (impedance element), DTX...Detection signal transmitter, 2TRX to 5TRX...Detection signal receiver, 2
VRX～4VRX...Receiver.

Claims (1)

[Claim for Utility Model Registration] A detection signal is supplied to a closed section that is continuously adjacent to the uninsulated rail, and in the section where a vehicle is present, the detection signal is short-circuited by the axle, thereby detecting the section where the vehicle is present. In a vehicle detection device for uninsulated track circuits that detects The antenna ANT placed on the vehicle for transmission, the series resonant circuit of the first capacitors C _3a , C _4a , C _5a and the first coils L ₃ , L ₄ , L ₅ and the series resonant circuit in parallel. The second capacitor C _3c connected,
A matching transformer MT _3a whose primary side is connected between the rails at the boundaries of each closed section via a composite circuit with C _4c and C _5c ,
MT _4a , MT _5a , third capacitors C _3b , C _4b , C _5b connected in a bridge between the rails near the boundaries of each closed section, and connected in parallel to the output side of a certain matching transformer, and the detection signal of interest is The attention detection signal transmitter DTX that sends out the on-board signal and the on-board signal receiver 3VRX that receives the on-board signal.
and an attention detection signal receiver 4TRX which is connected in parallel to the output side of the transformer MT _5a one upstream of the transformer connected to the attention detection signal transmitter DTX and receives the attention detection signal, and the attention detection signal receiver 4TRX receives the attention detection signal. receiver 4
The upstream detection signal receiver 5TRX that receives the upstream detection signal sent from the upstream side of the boundary where the TRX is provided, the onboard signal receiver 4VRX that receives the onboard signal, and the noted detection signal transmitter DTX are connected. A target detection signal receiver 3TRX is connected in parallel to the output side of the transformer MT _3a , which is one downstream of the transformer MT _4a , and receives the target detection signal, and a target detection signal receiver 3TRX is connected in parallel to the output side of the transformer MT 3a, which is located downstream of the boundary where the target detection signal receiver is installed. a downstream detection signal receiver 2 that receives a downstream detection signal sent from the downstream detection signal receiver 2;
TRX, onboard signal receiver 2 that receives onboard signals
VRX, and second and third capacitors C _3b , C _4b , C _5b ,
C _3c , C _4c , C _5c are the first capacitors C _3a , C _4a , C _5a
The capacitance _is set to be smaller, _and the capacitance _is set to pass the _{on -} board signal and _block the detection signal. A resonant frequency is determined to match the frequency of the second and third capacitors C _3b , C _4b , C _5b ,
C _3c , C _4c , C _5c and matching transformers MT _3a , MT _4a , MT _5a
The primary winding forms a receiving loop for onboard signals, and the onboard signal receiver generates an output signal when detecting an onboard signal in the receiving loop for onboard signals. The device is set so that the reception output of the corresponding detection signal disappears due to a short circuit caused by the axle of the vehicle up to a considerable distance before and after the section to which it belongs, and the output of the detection signal receiver of interest and other detections are A vehicle detection device for an uninsulated track circuit, characterized in that when signal receiver outputs overlap and disappear and an on-board signal receiver output is obtained in that section, it is determined that a vehicle is present in that section.