SU1154120A1 - Apparatus for automatic controlling of the speed of rail vehicle - Google Patents

Abstract

1. DEVICE FOR AUTOMATIC REGULATION OF THE VELOCITY OF THE RAILWAY VEHICLE containing the actual speed measurement unit mounted on the vehicle, the output of which is connected to one input of the speed comparison unit, to the other input of which one output of the program speed unit is connected, and to the output - control unit of actuators , characterized in that, in order to increase accuracy, it is provided with a threshold unit, the output of which is connected to the control unit of the executive bodies, and, the input - to another output of the software speed unit. О О which has a transceiver inductively connected to the rail line, the input of which forms the input of the program speed unit, resistors connected between the rails of the rail line, analog voltage divider, the output of which forms the first output of the program speed block, phase meter, the output of which forms the second output of the program block speed, the generator, the output of which is connected to the transceiver, to one input of the phase meter and, through one signal converter, to one input of an analog divider eg other input through a different signal converter and through a large-scale amplifier is connected to a transceiver (O and to the output of a large-scale amplifier (L is connected to another input of the phase meter. 2. The device according to claim 1, characterized in that the transceiver is designed as a measuring bridge, one pair of shoulders which included resistors, and the other - the inductor. Eat / J

Description

FIELD OF THE INVENTION The invention relates to railway transport, in particular, to automatic speed control devices.

The purpose of the invention is to improve accuracy. FIG. 1 shows a functional diagram of the device; in fig. 2 - functional block diagram of software speed.

The device for automatic regulation of the speed of a rail vehicle contains an actual speed measurement unit 1 installed on the vehicle, the output of which is connected to one input of block 2 compared to that of speeds, to another input of which the output of block 3 of program speed is connected, the other output of which is connected to the threshold input unit 4, the output of which is connected to the control unit 5 of the executive bodies, to the other input of which the output of the speed comparison unit 2 is connected. The block 3 contains a generator 6, a transceiver connected to it, made in the form of a measuring bridge 7, the output of which is connected via a scale amplifier 8 to a phase meter 9, and through a signal converter 10 to an analog voltage divider 11, which is connected via converter 12 amplifier 8. In the rail line included resistors 13.

Device works as follows.

When the vehicle is moving using block 3, the module and the argument of the input resistance of the rail line are measured continuously. The value proportional to the input line resistance module obtained in block 3 is compared in block 2 with a value proportional to the actual speed measured by block 1. The difference of these values is fed to the input of block 5, which, depending on it, commutes the motors and the braking system. From another output of block 3, a signal proportional to the argument of the input resistance of the rail line is sent to threshold block 4. If the argument of the input resistance is in a given range of values, the signal from the output of block 4 gives permission to move, and the output of the argument beyond the specified range causes brake system switching. Moreover, if, when driving in front of the vehicle at a distance shorter than the electric line length at the measurement frequency transmitted to the rail line by the generator 6 via the measuring bridge 7, there is no obstacle in the form of a break or a shunt, then the modulus and argument of the input resistance will be equal to the modulus and the impedance argument and, therefore, the speed control will be

It is proportional to the design speed, since the magnitude of the impedance modulus is modeled on the magnitude of the design speed using the electrical elements of the 13 resistors installed in the rail line, in accordance with

with the formula

VP / ZB /. /yz.p.(...+ r) /, where Vp is the calculated travel speed; rail impedance modulus;

Ir resistance rail; ballast resistance;

b resistance of ustaG resistors poured into the rail line to achieve proportionality

VP- / ZB /.

If there is a broken or stripped rail in front of the vehicle and the distance to it becomes less than the electrical length of the rail line, then the input resistance argument is reduced with respect to the wave resistance argument in accordance with the formula:

arg ZBX. arg Zec.thy.

where oth is a hyperbolic cotangent;

ZBX rail input resistance

lines; ZB - rail impedance

lines;

 - distribution coefficient; t is the length of the rail line from the vehicle to the obstacle. If the argument is outside the specified range, the braking system is switched.

If there is an obstacle in front of the vehicle, a shunting rail line (another vehicle), and the distance to it becomes less than the electrical length of the line, the input impedance modulus of the line is reduced relative to the impedance modulus according to the formula:

Zi "./ ZBt ..,

where Z in is input

rail line resistance-,

Z in - wave resistance of the rail line;

2H is the spread coefficient; f. - the length of the rail line; Ы - hyperbolic tangent. A change in the input resistance module causes the switching of the motors and the braking system. The measurement frequency is chosen such that the stopping distance is less than the electrical length of the rail line.

Unit 3 software speed when measuring as follows. From the generator 6, the voltage of the measuring frequency is fed to the input of the measuring bridge 7 and also to the input of the phase meter 9 and to the input of the converter 13. The input of the scale amplifier 8 is connected to the output of the measuring bridge. The voltage at the input of the scale amplifier 8 with a balanced bridge 7 is determined by formula:

y azctf M ,,

"At (ah-2) 2vkh

e YM is the input voltage of the large-scale amplifier;

Yj is the voltage at the input of the measuring bridge connected to the rail line;

Z is the resistance of an inductively coupled coil to the rails;

R is the resistance of the resistor in the measuring bridge arm;

the frequency at which the measurement is made;

M is the coefficient of mutual induction of the inductive coupling with the rails;

ZBX-input impedance of the rail line in front of the moving unit. With a constant R, Z, se), M and. UM module ... inversely proportional to the ZBX module .... and the argument is equal to the difference of the sum of the arguments of these constant values and the variable argument ZK ... Voltage from the output of the scale amplifier 8 It is fed to the second emitter of the phase meter 9 and to the input of the converter 10. Phase meter 9 determines the voltage difference from the output of the generator 6 and from the output of the scale amplifier 8, which is proportional to the argument of the input resistance. Voltages from the output of converters 10 and 12, proportional to the amplitude values of the voltages at the output of amplifier 8 and generator 6, are fed to the inputs of divider 11. The voltage at output of divider 11 is proportional to the module of the input resistance of the rail line in front of the vehicle.

Claims (2)

1. DEVICE FOR AUTOMATIC REGULATION OF SPEED OF A RAIL VEHICLE, which contains an actual speed measuring unit installed on the vehicle, the output of which is connected to one input of the speed comparison unit, one output of the program speed unit is connected to the other input, and the control unit for executive bodies is connected to the output , characterized in that, in order to improve accuracy, it is equipped with a threshold unit, the output of which is connected to the control unit of the executive bodies, and the input - to to another output of the program speed unit, which has a transceiver inductively connected to the rail line, the input of which forms the input of the program speed unit, resistors connected between the rails of the rail line, an analog voltage divider, the output of which forms the first output of the program speed unit, a phase meter, the output of which forms the second output program speed unit, the generator whose output is connected to the transceiver, to one input of the phase meter and through one signal converter to one the input of an analog voltage divider, the other input of which is connected to a transceiver through a different signal converter and through a scale amplifier, § and another phase meter input is connected to the output of the scale amplifier. 2. The device according to π. 1, characterized in that the transceiver is made in the form of a measuring bridge, in one pair of shoulders of which resistors are included, and in the other - inductors. Fig / SU p „1154120>