SU982939A1 - Apparatus for detecting extra slipping of rail vehicle wheel pairs - Google Patents

Description

(5) DEVICE FOR DETECTION OF OVERDUCE SLIDING WHEELS OF MOBILE COMPOSITION

one

The invention relates to railway transport, in particular to systems for protecting rolling stock from boxing and skidding, and can be applied to locomotives, electric and diesel trains and other railway vehicles.

A device for detecting excessive slip of wheelsets of a rolling stock is known, which contains sensors for the rotational speed of wheelsets connected to shaper inputs, the outputs of which are connected to one of the inputs of the respective counters and to the inputs of the selection unit 5, the frequency of frequency, the multiplier and the keys fl 3.

A disadvantage of this device is the low accuracy of the slip measurement .20

The purpose of the invention is to improve the accuracy of measurement of excess slip.

The goal is achieved by those. that the device for detecting excessive slip of wheelsets of rolling stock, containing sensors of rotational speed of wheelsets, connected to the formers of the formers, the outputs of which are connected to one of the inputs of the respective counters and to the inputs of the extreme frequency selection unit, multiplier and keys, is equipped with a rectifier and an extreme unit voltage, the inputs of which are connected via rectifiers to the corresponding speed sensors of the wheelset, and the output to one of the inputs of the multiplier, the other input of which It is connected with the output of the extreme frequency selection block, and the output is with one of the key inputs, the other input of which is connected to the output i of the corresponding counter, and the third to the output of the corresponding driver.

FIG. 1 is a functional diagram of the proposed cTsa redundant slip detection device; in fig. 2 shows a variant of the execution of the extreme frequency selection block; in fig. 3 - performance of frequency multiplier. The device for detecting excessive slip of wheelsets of rolling stock contains sensors 1 for the speed of rotation of wheelsets (conventionally shown for two wheelsets), the outputs of which are connected to the inputs of the formers 2 of rectangular pulses and the inputs of rectifiers 3, the outputs of which are connected to the inputs of the unit of extreme pressure wives The output of each generator 2 rectangular pulses connected to the input of the key 5, with the input of the installation of the zero of the counter 6 and one of the inputs of the block 7 selection of extreme frequency, the input of which is connected to the input of the frequency multiplier 8. The output of multiplier 8 is connected to the summing input of each counter bis input of each key 5. The output of each counter 6 is connected to the remainder of the input of the corresponding key 5. The outputs of the keys 5 are the outputs of the slip measurement channels of the respective wheel sets, i.e. are the outputs of the device. Synchronous tachogenerators are used as sensors of rotational speed of wheel pairs. The extreme part selection unit 7 can be constructed according to the scheme shown in FIG. 2. The block contains triggers 9 by the number of wheel pairs and a logic element AND 10. The single input of each trigger 9 is connected to the output of the corresponding forma l 2 pulses. The zero inputs of the flip-flops are connected to the output of the logic element AND 10. The output of each of the flip-flops 9 is connected to one of the inputs of the element 10, the output of which is the output of block 7. The frequency multiplier 8 (FIG. 3) contains a series-connected trigger 11, the adder 12, a low-frequency filter 13, a voltage-to-frequency converter 14, and a frequency divider lii, the output of which is connected to the zero input of the trigger 11. Unit input 1b of the trigger 11 is connected to the output of the extreme frequency selection unit 7. The input 17 of the adder 12 is supplied with the correction input of the multiplier 8 and is connected to the output of the block for selection k of the extreme voltage. The output of the voltage-to-frequency converter k is the output of the multiplier 8. The proposed over-slip detection device operates as follows. Sensor 1 produces a variable signal whose frequency is proportional to: 1) the speed of rotation of the wheelset. A shaper 2 from a signal from a sensor 1 generates square-shaped pulses, the duration of which is proportional to the signal / sensor period (for example, equal to half the period). The pulses of all drivers 2 are received in block 7 of the choice of the extreme frequency, which at its output has a sequence of HocTb pulses of the extreme (reference) frequency. The multiplier 8 increases the frequency of the reference pulses a given number of times. A rectangular pulse from the output of the imager 2 is fed to the reset input to zero of counter 6, and with its leading edge sets counter 6 to the zero position; the counter 6 begins to be filled with pulses from the multiplier 8. The capacity N of the counter 6 and the coefficient K of the multiplier 8 are selected from the condition N K where is the required accuracy of the slip measurement, expressed as a percentage. During the filling time of the counter 6, a rectangular pulse of the reference duration is generated at its output, i.e. of a duration that corresponds to the frequency of rotation of the reference (non-slip) wheelset. Key 5, one of the inputs of which is prohibiting, compares the pulse duration of the driver 2 and the counter 6, i.e. comparison of the duration of the test reference pulse. If the controlled wheel pair does not slip, then both of the compared pulses have the same duration, and at any time the signal at the output of the key 5 is absent. If a pair of wheels begins to slip, then a long-. The impulse capacity of the imaging unit 2 of this 5 wheel pair changes (decreases with on boxing and increases right) ,. The durations of the monitored and reference pulses become unequal. For the length of time equal to the difference between the durations of the monitored and the reference pulses, at the output of the key 5 passes a series of pulses from the multiplier 8. The number of these pulses per unit of time is proportional to the difference of the speeds of the sliding and reference wheel pairs. In this case, the cycle of measuring the velocity difference in the proposed device is repeated in each impulse addition period from the speed sensor, i.e. the duration of the measurement cycle is one specified period, regardless of the speed of the vehicle. Block 7 (Fig. 2) in the presented sun)) andante serves to select the minimum frequency, and the device containing such a block determines excessive slip when blocking wheel pairs. The input of the key 5, connected to the output of the driver 2, is inhibitory. The block 7 for selecting an extreme (minimum) frequency operates as follows. The pulses of the driver 2 set the corresponding triggers 9 to one state. When a single state matches, all the hero 9 triggers the element AND 10, while all the triggers 9 are set to the zero position. Pulses with the frequency of the smallest of all frequencies of the pulses are fed to the inputs of the trigger 9. Frequency multiplier 8 operation (Fig. Is based on the principle of phase-locked loop. Trigger 11 performs the role of a phase comparator, a switching pulse of 41 compared frequencies, namely the reference frequency The pulses of which are fed to the single input l6 of the trigger 11, and the feedback frequencies applied to the zero input of the trigger 11. The constant to the component of the output voltage of the trigger 11 is directly proportional to the phase difference of the switching trigger and pulses. -The indicated constant component is formed using a low-frequency filter 13 and is converted by an AND 39 converter into the frequency of the output pulses of the multiplier 8. Frequency divider 15 included in the feedback circuit, the output frequency is reduced by a number equal to the required the multiplication factor K of the multiplier 8. TaioiM, by automatically adjusting the output frequency of the multiplier. The operating range of the frequency multiplier is characterized by the ratio of the maximum multiplied frequency to the minimum. At input frequencies that are outside the operating range, the multiplier either stops working completely or changes the multiplication factor. The operating range of the multiplier is significantly limited by the fact that the multiplier is usually required to maintain performance with a sharp change in the input frequency, and this requirement is only possible in a fairly narrow frequency range due to the large inertia of the multiplier. To extend the working range, as well as to increase the accuracy of the multiplier, the latter contains an adder 12 with a corrective 17. The correction voltage applied to the input T7. reduces the voltage error at the input of the filter 13 at frequencies outside the operating range of a multiplier that does not have a correction. The correction voltage is formed from the output voltage of the tachogenerators (Sensors 1) with the help of the rectifiers 3 and the extremum selection unit k (for the case of minimum boxing) voltage. The unit is a diode assembly with a voltage source and a resistor. The voltage at the F) input of block 4 in the over slip detection device is the minimum of all input voltages and proportional to the speed of rotation of the reference wheel pair. When the proposed device measures the overslip of wheelsets when using it, its difference from the known one is that unit 7 is the maximum frequency selection unit; block t in the block selection of the maximum 3. app; the prohibitive input of the key 79 5 is the second input connected to the output of the counter 6. Technical appraisal and economic advantages of the device for the detection of excessive slip of wheel pairs of the enclosed. They increase the accuracy of measurement and improve the quality of operation of the device during measurement: 1 excess glide by expanding the range of operating speeds. The invention The device for detecting the excessive sliding of wheel sets of rolling stock, containing sensors for the rotation of wheel sets connected to the inputs of the formers, the outputs of which are connected to one of the entrances of the counters and extremal frequency selector, multiplier and keys in order to increase accuracy, it is equipped with a rectifier and an extreme voltage selection unit, the inputs of which are connected through rectifiers to the corresponding rotation speed sensors Olesno pairs, and an output - to one of inputs of the multiplier, the other input of which is connected to the output of extreme frequency selection unit, and output - with one of the key inputs, the other input of which is connected to the output of the corresponding counter and the third - to yield the corresponding shaper. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 3306651/11, cl. B 60 L 3/10, 03.0.81.

Fig 2

Claims (1)

Claim A device for detecting excessive slip of wheel pairs of rolling stock, containing wheel pair speed sensors connected to the inputs of the formers, the outputs of which are connected to one of 20 inputs of the respective counters and the inputs of an extreme frequency selection block 982939, a multiplier and keys, characterized in that , in order to increase the exactness, it is equipped with a rectifier and an extremal voltage selection unit, the inputs of which are connected through rectifiers to the corresponding wheel speed sensors, output - to one of the inputs of a multiplier 10, another input of which is connected to the output of extreme frequency selection unit, and output - with one of the key inputs, the other input of which is connected to the output of the corresponding counter 15 and the third - corresponding to the output driver.