CS248411B1 - Antiskid protection pick-up - Google Patents

Abstract

Anti-skid sensor they are equipped with monitored driving and common the rolling stock is composed of a sensor torsional oscillations. Signal output from The sensor is connected to a known electrical anti-slip wiring that is set to the / a / return loop limit value / 4 / slip characteristics of wheelsets.

Description

(54)

Non-slip sensor

The anti-slip sensor, which is equipped with monitored driving and common rails of rail vehicles, consists of a torsional oscillation sensor. The signal output from the sensor is connected to known electrical anti-slip wiring, which are set to the limit value (a) of the return loop (4) of the wheelset slip characteristics.

248 411 (51) Int CI.Ý

B61H 11/00

- 1 248 411

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-skid sensor, particularly for traction rail vehicles.

When realizing the traction force of the traction vehicle, the load distribution occurs on its wheelsets, since the wheelsets have a different tendency to slip. The results of the research of the slip processes show that the traction of the wheelsets of traction vehicles does not occur simultaneously, and the velocities of the wheelsets and hence the slip characteristics of the wheelsets differ from each other.

Said peculiarities of the traction vehicle wheel slip make it possible to use a device to measure the distance traveled of each wheelset during the measurement cycle, to compare this track with the actual vehicle travel and to output the signal to the wheelset speed controller when the given travel distance difference of any wheelset is exceeded.

. The previously known methods for indicating the slip of a wheel set of a traction vehicle either compare the impulses from two axles to each other, or the pulses from each axle are counted for a certain period of time and then the difference between them is checked. The first method is not suitable for vehicles with multiple axles and the second method is not very suitable for unequal sensitivity and speed of action at very low or high speeds. It is also known to connect two axles of interest with pulse sources, gate circuits and memory. It is known to connect with measuring and comparing the voltage of traction motor pairs where the motors are connected in groups or with minimum current evaluation. In addition, there are known connections in independent traction vehicles in which the drive axles, or even one free axle, are provided with frequency generators, for example tachogenerators, on which

Itl outputs are connected to converters and other accessories. Furthermore, a circuit is known, consisting of angular velocity or acceleration sensors, the largest signal selection block, a summator, a comparison element and a threshold element. The sensors are located

- 2 248 411 on the axles of all wheelsets of the vehicle, one of which is chosen as a control Si control.

A common feature of said alternatives to the anti-skid devices is that the electrical equipment in question uses a signal proportional to the instantaneous velocity or acceleration of the wheelset wheel as input.

SUMMARY OF THE INVENTION The object of the invention is to respond quickly to the onset of sliding of the wheelset axle on the rail; not depending on the speed of the individual wheelsets, but responding to the torsional oscillations of the return loop of the slip characteristics of the individual wheelsets.

This is achieved by using torsional vibration sensors as slip limit sensors of the individual axles, the output signal being applied to known electrical antiskid connections.

The principle of the invention consists in that each monitored axle of the traction and conventional vehicles is equipped with a torsional oscillation sensor and the electrical connection of the anti-slip protection is adjusted to respond to the magnitude of the oscillation loop reversal value of the respective wheel set.

The anti-slip sensor for detecting slippage or skidding of rolling stock wheels makes it possible to increase the sensitivity and speed of activation of the anti-slip protection system of the vehicle and to work with higher values of the coefficient of adhesion; this will make it possible to increase the reliability of the operation of the equipment and reduce the percentage of decommissioning as well as the damage to the track, by eliminating the possibility of defects on wheels exceeding the permissible dimensions.

By using torsional vibration sensors and setting the circuit to the male vibration values of the reversing loop according to the invention, it is possible to determine precisely and quickly the slip limit value, after which the traction or braking force decreases as the slip increases and at the same time greatly increases the torsional vibration amplitudes of the wheelset. In this way, the immediately achievable tractive effort of the vehicle can be utilized without the risk of slipping and the associated adverse consequences.

In the drawing, FIG. 1 shows the slip characteristics of the wheelsets with the return loops indicated, which according to the invention serve to set the torsional oscillation limits of the wheelset and thus

3 248 411 and the slip limit values of the wheelset, FIG. 2 shows the time recording of the torsional oscillations of the wheelset.

The slip characteristics of the wheelset according to Fig. 1 can be divided into ascending / effective / 1, transition part 2 and descending / inefficient / J. For traction and braking it is advisable to move in the ascending 1 area, where respectively. slip s, the tractive force T of the wheelset increases simultaneously; the maximum utilization of the coefficient of adhesion is for the transition region 2, where we reach the maximum values of the coefficient of adhesion, while there is no significant decrease in the traction force T when the slip speed w or the sliding speed is changed. When the limit value of slip s is exceeded, the wheelset goes into an unstable area where the traction force T decreases, the wheelset slip increases rapidly while increasing the torsional oscillations of the wheelset.

The limit value of the slip s can advantageously be determined by measuring the torsional oscillations of the wheelset, the limit value of the wheel oscillation being the amplitude and the return slip 4 of the slip characteristic, after which the wheel sets into the descending / inefficient slip zone.

The torsional vibration limit value and amplitudes are also shown in Figure 2, which shows the time recording of the wheelset torsional oscillations.

Claims (1)

SUBJECT MATTER Anti-slip sensor, which provides monitored drive and conventional axles, with a signal output to known electrical anti-slip connections, characterized in that it consists of a torsional oscillation sensor.