SU1350067A1 - Train anti-wheel slip control - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to the field of transport engineering and is intended for use on carriages with railcar drag meters. The purpose of the invention is to increase the efficiency of the system. Each car has a device 1 for detecting yuz with a common output 1.1 connected to the input of the element 5, and individual outputs 1.2 for the number of wheel pairs connected to the inputs of the adder 2. In addition, on each car there is a prohibition element 6, trigger 4, the analog key 3 and the executive unit 7. The logical threshold element 9, the delay element 10 and the maximum position indicator 8 are common to the whole train and serve for disinhibition in each cycle only those cars that have a larger number of sliding wheel sets. The rest of the cars, even if they are equipped, are not disinhibited. 4 il. i SL 00 SD Oi (Rig.1

Description

The invention relates to railway transport, mainly to anti-roll-back systems, and is intended for use on trains with wagon-free disinhibition, mainly on electric and diesel trains with a constant number of cars.

The aim of the invention is to increase the efficiency of the system.

FIG. 1 is a block diagram of an anti-train system; in fig. 2 is a schematic diagram of one of the options for detecting a user; in fig. 3 is a block diagram of a logical threshold element; in fig. 4 - the same, option.

The anti-crisis system contains N identical carriage blocks, one for each of the N cars, each of which includes device 1 for detecting yuz with a common output 1.1 and individual for the number of wheel pairs outputs 1.2, adder 2, analog key 3, trigger 4, element 5; prohibition element 6; and an actuator 7 for adjusting the pressure of the brake pads. In addition, the system includes common places for all cars, pointer 8, the appearance of maximum, logical threshold element 9, and delay element 10.

Individual outputs 1.2 of the device 1 are connected to the inputs of the adder 2, the output of which is connected to the information input of the analog switch 3. The common output 1.1 of each device is connected to one of the inputs of the corresponding element AND 5. The outputs of all the analog switches 3 are connected to the corresponding inputs of the indicator 8 occurrences maximum, the outputs of which are connected to the direct inputs of the corresponding prohibition elements 6. The output of each trigger 4 is connected to another input element And 5, the output of which is connected to the input of the execution unit 7 and to one of the inputs of the logical threshold element 9, the output of which is connected to the inverse inputs of all prohibition elements 6 and through the delay element 10 with zero inputs of all the trigger 4. The output of each element 6 of the ban is connected to a single input of the corresponding trigger 4.

The device 1 according to FIG. 2 contains axial tachogenerators 11, one for each axle of the car, block 12 for selecting the minimum signal, block 13 for selecting the maximum signal and comparators 14 and 15. The output of each axial tachogenerator 11 is connected to one of the inputs of blocks 12 and 13 and to one of the inputs of the corresponding the comparator 15. The outputs of the blocks 12 and 13 are connected to the inputs of the comparator 14, the output of which is the common output 1.1 of the device 1. The output of the maximum signal selection unit 13 is also connected to the other inputs of the comparators 15 whose outputs are

individual outputs 1.2 (per wheel pair) of the device 1.

The logical threshold element 9 can be performed in two versions (Fig. 3 and 4).

According to FIG. 3 logical threshold element 9 consists of a series-connected adder 16 with the number N of inputs by the number of inputs by the number N of train cars and an asymmetrical trigger 17.

According to FIG. 4 logical threshold

element 9 contains elements AND 18 and elements OR 19, the inputs of which are connected to the outputs of all elements AND 18. The number Qi8 of elements AND 18 and, respectively, the inputs of the element OR 19 in the logical threshold element 9 is equal to

N

(N-m)

; i)

0

where C is the number of combinations of N in t;

N is the total number of cars in a train, equal to the number of inputs of the logical threshold threshold element 9; m is the permissible number of simultaneously decelerated wagons equal to the number of inputs of each of the elements And 18.

Counterintuitive system of the train works as follows.

In the absence of a user, the signals at inputs 1.1 and 1.2 of the device are zero. The signals at the outputs of the elements And 5 are missing, and 0 execution units 7 are disabled. At the outputs of the adders 2 and the output of the logical threshold element 9, the potentials are zero. Analog switches 3 at zero potentials at the control inputs transfer the voltage from the inputs of the adders 2 to the corresponding inputs of the indicators 8 places with a maximum occurrence.

When a car appears in one of the cars, a single signal appears on the common output 1.1 of the device 1 of the corresponding car, which is fed to one of the

0

the inputs of element 5. At the output of the corresponding adder 2, a voltage appears, the level of which is directly proportional to the number of sliding wheel sets of the given car (as they are summed up from the signals of the individual outputs 1.2). The voltage from the output of the adder 2 through the analog switch 3 is applied to one of the inputs of the indicator 8 of the maximum appearance. The signal of the logical unit appears at the output of pointer 8, the number of which coincides with the number of the input where the voltage value is the greatest at a given time. The signal from the output of the indicator 8 through the corresponding prohibition element 6 (no prohibition signal) is fed to the single input of the corresponding

5 flip-flops 4. Trigger 4 is set to one state and through element I 5 turns on the corresponding executive unit 7. The car is disinhibited. At the same time, the signal from the output of the element 5 goes to one of the inputs of the logic threshold element 9 and to the control input of the corresponding analog switch 3. The latter closes, stopping the signal from the adder 2 to the input of the indicator 8 at the maximum occurrence point. Similarly, when the occurrence of a skid occurs, each of the remaining cars is disinhibited until the number of disarmed cars reaches a predetermined limit value t corresponding to the threshold of the logic threshold element 9. At the m inputs of the threshold element 9 and at its output a potential of enters the prohibition elements 6, and after a time T of the delay of element 10 sets all the triggers 4 to the zero state. This moment can be considered as the beginning of each cycle of operation of the device in the case when there is a place of wheel sets not less than that of m cars.

When all triggers 4 are transferred to the zero state, the signal disappears (for a very short time) on all execution units 7. At the output of the logic threshold element 9 and at the control inputs of the analog switches 3, a zero potential is established. At the inputs of the indicator 8, the appearance of the maximum appears Voltages from the outputs of the adders 2. The indicator 8 generates a signal of a logical unit at the output corresponding to the car with the largest number of sliding pairs. This signal through the prohibition element 6 sets the trigger 4 to the one state. The execution unit 7 is turned on, and the analog switch 3 is locked. Now, at the outputs of pointer 8, the voltage of the adder 2, belonging to the next wagon by the number of sliding wheel pairs, will be maximum. The executive authority 7 of this carriage is included. So, in order of decreasing the number of slipping pairs, m cars will be broken down, after which the logical threshold element 9 is triggered and a new system operation cycle begins.

Thus, in each cycle, w cars that have a greater number of sliding wheel sets are unbraked. The rest of the (N-sh) carriages, even in the presence of a skid, are not disinhibited.

The duration ti of each cycle is determined by the delay time t of element 10 and the total duration tn of transients of the system elements.

Tu "t -f tn.

The magnitude of the delay t is based on the following considerations.

On the interval of time equal to tn, the alternate appearance of the signal of the logical unit occurs at the outputs of the elements 5 y

m wagons in decreasing order of the number of sliding pairs.

In the next segment, equal to m, these signals are saved, after which the cycle is repeated.

Executive units 7 have a certain inertia, so that a short-term (for a period of time in) the removal of the control signal does not turn them off. To do this, the condition must be met.

t tn

ten

five

Thus, the duration of the cycle Ti 5 of operation of the device is mainly determined by the time t of the delay of element 10. Since during the time t can change the priorities of the cars, this parameter must be sufficiently small. In practice, the values of tn and t lie in the following:

 10-100 µs; t x 0.01-0.1 s.

When a car stops at any of the cars, a single potential is changed to zero in the circuit: common input 1.1 of device 1 - element AND 5 - input of execution unit 7. The latter is switched off regardless of the system operation cycle. The presence of elements And 5

"The system is also protected against interference caused by the high sensitivity of the indicator 8, where the appearance of a maximum occurs: in the absence of a wagon for all cars, the interference voltage may exceed the voltage at the inputs of node 8, corresponding to the absence of sliding wheel sets, resulting in one of the outputs of the node 8 is a signal that sets the trigger 4 in one state. But,

since there is actually no skid, element 5 does not work and executive 0 block 7 remains off.

Claims (1)

Invention Formula Anti-ticketing system of a train containing a device for detecting a yuz on each car, the total output of which is keyed to one of the inputs of the element I, a trigger and an executive unit for controlling the pressure of the brake shoes, having an electrical input and a common threshold element for all cars equal to the number of cars in the train, and the input of each executive unit is combined with the corresponding input of the logic threshold element, characterized in that, in order to increase the efficiency of the system, it is equipped with and each house is an analog key, a prohibition element and a common indicator for the whole train with a maximum position indicator with the number of entries and exits equal to the number of cars and the total 0 a delay element, and each detection unit is made with individual outputs by the number of wheel pairs combined by an adder, the output of which is connected to the information input of an analog switch connected by a control input to the output of the element I, the other input connected to the output of a trigger connected by a single input to the output of the prohibition element, the direct input of which is connected to the corresponding input of the pointer of the maximum occurrence connected by the inputs to the outputs of the analog switches, the outputs of the elements And n Connected to the inputs of the logical threshold element connected by the output to the inputs of the inhibit elements and through the delay element to the zero inputs of the triggers. Srig.G. Fig.Z