SU659437A1 - Arrangement for detecting the direction of vehicle motion - Google Patents

Description

one

The device is intended for use in systems of automatic control and movement control of transport mobile units.

A device for determining the direction of movement of a vehicle is known. It contains sensing elements of linear movement, made in the form of differential transformers with magnetic core. The primary winding of the magnetic circuit is connected to the alternator, and the signal and compensating windings are interconnected with the load and with key circuits made on transistors and diodes, with the core of the magnetic core being divided into equal parts forming separate compensating and working branches 1.

The disadvantages of the known device are the COMPLEXITY of building the sensing elements and, therefore, the lack of reliability.

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

The purpose of the invention is achieved by the fact that one part of the divided working branch of the magnetic circuit is equipped with a working signal winding, another part of the working branch of the magnetic circuit is provided with an additional signal winding, and both parts of the magnetic circuit are equipped with a working section of the primary winding, and one part of the compensating branch of the magnetic circuit is equipped with a compensating

signal winding, and both parts are also equipped with a common compensating section of the primary winding, the signal windings are connected by a star, the other end of the compensating signal winding is connected to the emitters of key transistors, the collector-emitter transitions of which are connected through the load and diodes to the compensating section of the primary winding the transistor is connected to

the end of the working signal winding, and the base of the other is connected to an additional signal winding.

FIG. 1 shows a circuit diagram of the device; in fig. 2

shows a diagram of the output signals; in fig. 3 shows an example of performing separate magnetic branches of a magnetic circuit.

The device contains a branched magnetic circuit 1, the working magnetic branch of which is divided by air gaps into equal parts 2 and 3 and is equipped with a working section of the primary winding 4. One part 5 of the magnetic circuit is equipped with a working signal winding 6, and the other part 3

the magnetic circuit is equipped with an additional signal winding 7.

The compensating magnetic branch 8 of the magnetic circuit is also divided by air gaps and consists of two parts 9 and 10 and is equipped with a compensating signal winding 11. Part 9 of the magnetic circuit is equipped with a compensating signal winding 12. The signal windings 6, 7 and 12 are connected in opposite directions. The second end of the winding 6 is connected to the base of the key transistor 13. The second end of the winding 7 is connected to the base of another key transistor 14. The compensators of transistors 13 and 14 through diodes 15 and 16 and the loads 4, 17 and 18 are connected to the connection point of the windings section 4 and 11 between by itself, as well as by the decryptor 19. The emitters of the transistors 13 and 14 are connected by themselves and through a resistor 20 to the second end of the compensating signal winding 11 and their compensating winding section 12. Dots denote the ends of the sections and windings having the same current potential values .

The device works as follows.

Until the appearance of a controlled vehicle, due to the magnetic and electrical symmetry of the circuit, there are no signals at the inputs of transistors 13 and 14 (Fig. 1) and they are locked at the input (situation 00 on Chart 2). When a controlled vehicle appears in a part, for example, 2 of the magnetic circuit 1, due to an increase in the magnetic conductivity of the air section, the inductive resistance of section 4 increases, so the voltage drop on section 4 will increase by more than section I. The magnetic flux in part 2 of the magnetic circuit will increase respectively e. d. signal winding 6. Difference e. d. windings 6 and 12 in the corresponding half-period opens the transistor 13, which in combination with the windings 4, 6, 11 and 12 begins to work as an auto-oscillator. As a result, a signal appears on load 17 (situation 10 on dam. 2). Despite the decrease in ed. with. The windings 12 do not change the signal at the output of the oppositely connected windings 7 and 12 in the second half period of the supply voltage, since due to the increase in conductivity of section 2, the magnetic flux generated by section 4 of the primary winding in parts 2 and 3 will redistribute.

With the further movement of the controlled funds in the zone of part 3, due to

increase in ed. with. in the winding 7, the corresponding half-period of the supply voltage begins to generate the transistor 14 (situation I in fig. 2).

Further promotion of the controlled mechanism from the zone of part 2, due to the new redistribution of the magnetic flux between parts 2 and 3, will cause the generation of the transistor 13 to fail (situation

01 on hell 2), and further on, transistor 14 (situation 00 in Fig. 2).

When moving the monitored means in the opposite direction, the sensor operation is similar to that described, only

with a different sequence of situations.

Claims (1)

1. A. Panin. Sensors for automation of coal mines, “Technique, Kiev, 1975, p. 21-27. 7..4 I L zV  one/ V -1or W