SU1765046A1 - Moving objects locator - Google Patents

Abstract

The invention relates to railway devices for automation, telemechanics and communication, and can be used in the implementation of automatic location fixation devices. The purpose of the invention is to improve accuracy. The bridge circuit formed by signal emitter 1, capacitor 2, two primary semi-windings of differential transformer 3, generator 4 of sinusoidal signal and unit 5 for determining the signal phase, reacts to the appearance of the train emitter 1 in the area, and switching contacts 11 of the switching relay and with The generator 4 of the sinusoidal signal begins to emit pulses into the air with a duration determined by the waiting one-vibrator 9. 1 Il.

Description

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WITH

The invention relates to railway devices of automation, telemechanics and communications, and can be used in the implementation of devices for automatically fixing the location of trains when moving in stations and hauls.

The purpose of the invention is to increase accuracy.

The drawing shows the functional diagram of the device.

The device contains a bridge circuit formed by a signal emitter 1, a capacitor 2, two primary half-windings of a differential transformer 3, a sinusoidal signal generator 4 and a signal phase determining unit 5 included in the bridge circuit through a secondary winding of a transformer 3. A sinusoidal signal generator 4 is connected via shaper 6 with block 5 for determining the phase of the signal. The output of block 5 is connected to the input of a voltage converter 7, the output of which is connected to an AND 8 element serially interconnected, a single-oscillator 9 and a switching relay winding 10, and the generator 11 switches over the generator 4 when the device's operating mode changes. The output of the voltage converter 7 is connected to the amplifier 12. Which is connected via line 13 to the executive unit 14. The operation mode of the device is set using the operation mode selection unit 15.

The device works as follows.

The AC bridge circuit detects a change in shoulder capacitance, the elements of which are emitter 1 caused by the appearance of a train in the area of their location.

In the initial state with the help of closed contacts 11, the generator 4 is included in the common point of the two oppositely connected

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transformer primary semi-windings 3, which are the two arms of a four-arm alternating current bridge. The other two arms of the bridge are formed by a capacitor 2, the capacity of which will be called the installation, and the capacity of the radiator, the initial value of which (in the absence of the train) is greater than the installation. The bridge state is monitored by block 5 (i.e., the phase shift between the secondary voltage of the transformer 3 and the reference voltage of the generator 4, which can be zero only with a zero balance of the bridge). Under the initial condition, the bridge will be unbalanced and its output voltage on the secondary winding of the transformer 3 in phase will lag behind the reference voltage of the generator 4 by 90 °. In the presence of a train in the zone of their interaction, the bridge will be unbalanced, and its output voltage in phase will precede the reference voltage by 90 °. Thus, the marked two different states of the bridge will be characterized by a voltage, the phase shift between which is 180 °.

The former 6, which interacts with block 5, will generate from the sinusoidal voltage of the generator 4 the voltage of the rectangular pulses delayed relative to the beginning of the positive half-wave of the sinusoidal voltage by approximately 1/4 of the period (90 °) and its duration also approximately equal to 1/2 period

The resulting square voltage pulses are used as synchronization signals (resolutions) for operation of unit 5.

The former 6 comprises two series-connected single-oscillators (not shown in the diagram): the first produces an intermediate voltage, the second an output voltage. The first one-vibrator triggers when the sinusoidal voltage goes from negative values to positive values, and the second one triggers from the falling edge of the pulse of the first single vibrator. Thus, the interrogation of the state of the bridge will be carried out only at the instants of time determined by the frequency and duration of the pulse. Consequently, in the initial position (in the absence of a train), the bridge will be characterized by the negative phase of the output voltage at block 5, which, going to converter 7, will determine its output zero state. At the moment when the train is in the area of the elements, the ratio of the capacitances will determine the imbalance of the bridge and the phase change of the output voltage by 180 °. The output voltage of the unit 5 arrives at the converter 7 and, when converted to a constant voltage, will cause its output to change to zero

voltage on the unit. This unit voltage simultaneously arrives at the inputs of the element And and the amplifier 12. The output voltage of the amplifier 12 through the communication line 13 goes to the executive unit 14,

0 which can be located at a considerable distance from the location of the emitter 1, while in the role of the actuating element can be used railway devices of automation and

5 telemechanics. At the same time, if element 8 of the second unit signal, provided by unit 15, is present at the second input, the unit voltage of converter 7 through element 8 is fed to the input

0 waiting for one-shot 9, causing it to fire. The output voltage of the one-shot 9, applied to the winding 10, will cause switching of the contacts 11. As a result, a connection is started on the half-windings of the transformer 3, the end of which will be connected to the emitter 1, which now acts as a transmitting antenna. In this case, the voltage with the frequency of the generator 4 will be transmitted to the air in the interval

0 time, determined by the duration of the output voltage of the waiting one-vibrator 9. After the completion of the impulse of the waiting one-vibrator 9, the winding will not receive power and the contacts 11, having returned to the initial state, will form the bridge circuit again. If at this moment the train continues to be in the emitter area, then this situation will again be fixed by the unbalance of the bridge, as determined by block 5, and all the operations in the previously described sequence and the injection voltage of the generator 4 will be repeated. Such cyclic sequences of operations will be repeated automatically, as long as the train leaves the area of the radiator, i.e. at intervals extended to the end of the single-pulse pulse and the restoration of the initial conditions of the bridge:

When the signal is broadcast into the air, the phases of the output voltage of the secondary winding of the transformer 3 will not change, remaining the same as before the translation, i.e.

5 before switching the primary half transformer of the transformer, which will not have a change in the operating modes of the converter 7 and the amplifier 12. The broadcast voltage from the oscillator frequency 4 can be considered as a time-frequency signal

Full coding with parameters - the period of the generator frequency and the duration of the time package consisting of several periods, determining the location of the train. If for some reason the train detection signal is not required to be broadcast, limiting it to transmission through amplifier 12 and communication line 13 to executive unit 14, then changing the output state of unit 15 from output 1 to output 0, disables waiting for the one-shot 9 and thus, the prohibition of switching the transformer half-windings for the translation mode, the output state of the unit 15 can be set by presetting it or be changed by an external signal (for example, the switch-on signal ementa second similar device).

Claims (1)

An apparatus for determining the location of moving objects, comprising a sinusoidal signal generator, an executive unit, an input connected to the output of an amplifier, a signal emitter, a voltage converter, and a determinant unit. No change in the phase of the signal, characterized in that, in order to improve accuracy, it is equipped with a mode selection unit, a capacitor, an AND element, a waiting one-oscillator, a switching relay connected to an output of a single-VIB, the input of which is connected to the output of the voltage converter, and the other to the output of the operating mode selection unit, which is connected to one of the amplifier inputs, the other input of which is connected to the output of the signal phase detection unit, the first input of which o through a signal conditioner connected to one generator sine-wave signal output connected to the second input of the signal phase change detecting unit, and another generator output through a series-connected capacitor and the switching contact of the switching relay connected to the third input of the signal phase change detecting unit the contact of the switching relay is connected to a signal radiator connected to the fourth input of the signal phase change detection unit. 12 3