SU1541652A1 - Device for determining the number and motion direction of object - Google Patents

Abstract

The invention relates to automation and telemechanics and can be used in the systems of automatic control and operational control of road and rail transport, when, along with the identification of objects at the control point, it is necessary to determine the direction of their movement. The aim of the invention is to increase the functional reliability of the device. The receiving magnetic antenna 7 is located in the center of the receiving loop antenna 6. When the object 4 enters the zone of the control point 5, the transmitting loop antenna 3 of the transmitter 2 emits the object number code coming from the output of the dial 1 number to the input of the transmitter 2. The signal received by the receiving antennas goes to corresponding amplifiers 8.9 and 10. The signal from amplifier 8 is fed to the input of the decoder 11, the output of which forms the number code, to the input of the amplitude detector 12 and to the reference inputs of the phase discriminators 16 and 17, in which comparing this signal with the signals coming from the outputs of amplifiers 9 and 10. The output signals of phase discriminators 16 and 17, through the corresponding elements 18 and 19, switch triggers 20 and 21 depending on the direction of motion of the object. The device is not reset. 7 il.

Description

The invention relates to automation and telemechanics and can be used in the systems of automatic control and operational control of road and rail transport, when, along with the identification of objects at the control point, it is necessary to determine the direction of their movement.

The aim of the invention is to increase the functional reliability of the device.

FIG. 1 shows a functional diagram of the device in FIG. 2-7 - timing diagrams of the functional units of the device.

The device contains a unit number 1 of the vehicle, a transmitter 2 and a transmitting loop antenna 3 installed on the moving object 4, at the control point 5 receiving frame 6 and magnetic antenna 7, amplifiers 8-10, decoder 11, amplitude detector 12, pulse shaper 13, one-shot 14 and 15, phase discriminators 16 and 17, elements And 18 and 19 and triggers 20 and 21.

The receiving frame antenna 6 is installed in a plane parallel to the plane of the transmitting antennas of the moving object. The receiving magnetic antenna 7 is located in the center of the receiving loop antenna so that the axis of the magnetic core is directed along the road. The winding of the receiving magnetic antenna consists of two half-windings,

included in antiphase.

i

The device works as follows.

In the initial state, when there are no moving objects in the area of control point 5, there are no signals at the outputs of the flip-flops 20 and 21.

Transmitters 2 of the vehicle moving object operate continuously, emitting a modulated sequence of frequency signals using the transmitting loop antenna 3, carrying information about the number of the moving object that comes from the output of the unit 1 number. The modulation method is selected in each case depending on the value of the operating frequency, the level of electromagnetic interference, the radiation power, etc. Typically, these devices use frequency modulation. Operating frequency and speed

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The modulation rate is chosen such that during the travel time the moving object of the sensitivity point of the receiving antennas of the control point takes several cycles of receiving information. The receiving antennas of the control point are located on the side of the road in the case of road transport or between rails in the case of railway transport.

When a moving object 4 leaves the zone of the control point, the signal emitted by the crossing-frame antenna 3 causes voltage in the receiving frame 6 and magnetic 7 antennas. The variation of the amplitude of the induced signal in the frame antenna 6 (U6) and in the winding of the magnetic antenna 7 (Up shown in Fig. 2. The abscissa axis shows the distance from the geometric center of the receiving antennas (point 0), and the vertical axis of the induced high-frequency signal (excluding its modulation by number code) Un is the input signal level at which the pulse shaper triggers. This level determines the receiver's sensitivity zone from point B to point A when moving forward and from point A to point B when d izhenii ago. Sensitivity of reception antennas obviously received such that the points A and B the voltage IJ-, voltage exceeded

The induced signal in both semi-windings of the receiving magnetic antenna 7 is completely identical in amplitude and frequency, opposite in phase. In addition, as the object 4 moves through the sensitivity zone of the receiving magnetic antenna, the induced signal in each half-winding of the magnetic antenna 7 changes its phase by 180 ° at point 0. The signal induced in the receiving loop antenna 6 does not change its phase depending on the position Object 4 in the control zone.

The voltage induced in the receiving loop antenna 6 is amplified by the amplifier 8 and fed to the decoder 11. At the output of the latter, a number code of the moving object is generated.

At the same time, the signal from the output of the amplifier 8 is fed to the input of the amplitude detector 12, which selects the envelope of the signal received by the receiving loop antenna 6. The type of signal at the output of the amplitude detector 1 2 corresponds to the graph Us in FIG. 2. This signal is formed into a rectangular parcel by the driver 13 with the threshold level Un. The former has both direct and inverse outputs. The nature of the signal U (J at the direct output

shaper 13 is shown in FIG. 3. Single-oscillators 14 and 15 isolate the leading edge of the signals at the corresponding outputs of the LZ generator. Therefore, when an object moves in the forward direction (B), the one-shot 14 generates a short-term pulse when it enters the control zone at point B, and the single-vibrator 15 when it leaves the control zone at point A (Fig. 6). When an object moves in the opposite direction (H) of one-shot 14, it generates a pulse when it enters the control zone at point A, and the one-shot 15 — when it leaves the control zone at point B (Fig. 7). A one-shot 15, triggered when an object leaves the control zone, zeroes the output triggers 20 and 21.

The voltages of the semi-windings of the receiving magnetic antenna 7 are amplified by amplifiers 9 and 10 and are fed to the information inputs of phase discriminators 16 and 17. The reference inputs of these discriminators receive the voltage of receiving frame antenna 6 amplified by amplifier 8. Phase discriminators 16 and 17 perform phase comparison the signals of the semi-windings of the receiving magnetic antenna 7 relative to the phase of the signal of the receiving loop antenna 6. The output signal of the phase discriminator is generated when the phase of the signals on the information and reference signals coincides odes. In this case, the sensitivity threshold of the phase discriminators is chosen to be no more than the value Un of the threshold of the driver 13. In FIG. 4 and 5 show oscillograms of the output signals of phase discriminators 16 and 17, respectively, when the object is moved past the control point.

The output signal of each phase discriminator 16 and 17 is fed to the input element And 18 when moving forward and the element And 19 when moving backward. This signal has already been made at the moment the object approaches the borders of the sensitivity zone (points A, B). When moving forward at point B, the one-shot pulse 14 through element 18

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sets the trigger 20 to the unit state in which it is all the time the object is moving in the sensitive area of the receiving loop antenna. - When leaving the zone at point A, the signal of the one-shot 15 resets the trigger 20 to the initial zero state. Thus, when driving forward at the exit B of the device, there is a potential for the time the vehicle is in the control zone. There is no potential at the H output. When the vehicle moves backward, the trigger 21 switches in a similar way and there is a potential at output N. In FIG. 6 (7) shows a diagram of the signals at the outputs of one-shot 14 and 15 and the outputs B and H of the device when moving forward (backward).

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Claims (1)

Invention Formula A device for determining the number and direction of movement of an object, which, at a moving object, contains a setpoint for a vehicle number, the output of which is connected via a transmitter to a transmitting loop antenna, at a test point a receiving loop antenna connected to the input of the first amplifier, the output of which is connected to the input of an amplitude detector , the second amplifier, the decoder, the two elements And, differing from the fact that, in order to increase the reliability of the device, the | at the control point a receiving magnetic antenna, a third amplifier, a pulse shaper, two single vibrators, two phase discriminators and two flip-flops, the receiving magnetic antenna is located in the center of the receiving frame antenna, the first terminals of the windings of the receiving magnetic antenna are connected to the first inputs of the second and third amplifiers , the second terminals of the windings of the receiving magnetic antenna are interconnected and connected to the second inputs of the second and third amplifiers, the outputs of which are connected to the information inputs, respectively the first and second phase discriminators, the outputs of which are connected to the first inputs of the first and second elements, respectively, the outputs of which are connected to the first information inputs of the first and second triggers, respectively, whose outputs are the first and second breathes of the device, respectively; the output of the first amplifier is connected to the inputs of the decoder the amplitude detector and with the reference inputs of the phase discriminators, the decoder output is the third output of the device, the output of the amplitude detector is connected to JQ input pulse generator, the direct output of which is connected to the input of the first one-oscillator, the output of which is connected to the second inputs of the elements And, the inverse output of the pulse former is connected to the input of the second one-oscillator, the output of which is connected to the second information inputs of the triggers. FIG. five rt 0