SU1137390A1 - Device for measuring train motion speed - Google Patents

Abstract

A DEVICE FOR MEASURING THE TRAFFIC MOTION SPEED, containing a frequency-pulse speed sensor connected to a pulse shaper, the output of which is connected to the counter input of the counter, and a reference time generator, output connected to the counter installation input, characterized in that, for the purpose of increasing accuracy of speed measurement at a fixed measurement time and a given resolution of the frequency-pulse speed sensor; it is equipped with a pulse generator, a second counter, a block n am, an adder, a divider and a recorder, the output of the pulse generator is connected to the counting input of the second counter, the setup input of which is connected to the output of the pulse generator, the information outputs of the second counter are connected to the corresponding inputs of the memory block and the adder (L outputs of the memory block are connected with the corresponding inputs of the adder, with the outputs of the first counter and the outputs of the accumulator. The mattor is connected to the corresponding inputs of the divider, the outputs of which are connected to the corresponding inputs of the recorder, This output reference geneoe Rhatore slots connected to the input resolution -vi recording block information storage five-, 00 with

Description

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The invention relates to digital measurement technology and can be used in automatic and telemechanical control systems for train movement.

A device for measuring the speed of a train is known to contain (its frequency-impulse speed sensor placed on the locomotive connected to a pulse shaper whose output is connected to the counter input of the counter, a generator of reference time intervals whose output is connected to the installation input of the counter O J This device has the maximum the error of measuring the speed equal to the unit of the least significant bit of the counter.

To achieve the accuracy of speed measurement in the specified device with a given resolution of the network of the frequency-pulse speed sensor, it is necessary to increase the measurement time, which leads to a decrease in speed and an increase in the dynamic measurement speed of the train during acceleration

A device is known for measuring the speed, containing a frequency-pulse speed sensor connected to a pulse shaper, the output of which is connected to the counting counter input, and a reference time interval generator connected to the metering input of the counter 2}. :;

However, in this device, the measurement time is not constant and depends on the values of the measured speed. In addition, for automatic train control systems, the operation cycle of which is rigidly fixed, this device is not applicable.

The aim of the invention is to improve the accuracy of speed measurement at a fixed measurement time and a given resolution of the frequency-pulse speed sensor.

The goal is achieved by tiro device containing a frequency-pulse speed sensor connected to a pulse shaper, the output of which is connected to the counting input of the counter, and a generator of reference time intervals

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output connected to the installation input of the counter, equipped with a pulse generator, a second counter, memory unit, adder, divider and recorder, the output of the pulse generator connected to the counting input of the second counter, the installation input of which is connected to the output of the pulse former, the information outputs of the second counter are connected to corresponding to the inputs of the memory block and the adder, the outputs of the memory block are connected to the corresponding inputs of the adder, the outputs of the first counter and the outputs of the adder are connected to The respective inputs of the divider, the outputs of which are connected to the corresponding inputs of the recorder, while the generator output of the reference time intervals is connected to the Memory Record Information Recording INPUT.

FIG. 1 shows a diagram of a device for measuring the speed of a train; in fig. 2 is a diagram of how the device works.

The device for measuring the speed of a train contains a frequency-pulse speed sensor 1, a pulse shaper 2, a first counter 3, a pulse generator 4, a second counter 5, a memory block 6, an adder 7, a divider 8, a recorder 9, a generator of reference time intervals 10,

A device for measuring the speed of a train operates as follows.

When the train moves, the signal from

the output of the frequency-pulse speed sensor 1 is fed to a pulse shaper, 2, the output of which forms a sequence of square-wave Pulses with a frequency

directly proportional to speed

train movements. The signal from the pulse driver 2 is fed to the counting input of the first counter 3 and to the installation input of the second counter

5. Consequently, with the appearance of each pulse at the output of the pulse generator 2, the second counter 5 is reset to the zero state, which performs

pulse count from pulse generator 4. In the initial state, the counter 3 is in the zero state. 3 At the end of a fixed time interval T, specified by the generator of reference time intervals 10, the contents of the first counter 3, equal to N — the number of pulses received from the output of the pulse generator 2 to the input of the first counter 3, for a fixed time interval T, go to divisor 8, which divides N by the code X formed at the output of the adder 7 according to the following expression: X..N., - N, fj, is the frequency at the output of the pulse generator the number of pulses recorded by the counter 5 in this measurement cycle (in din, fig. 2), the number of pulses recorded by the counter 5 in the previous one. measurement cycle (during din-1, Fig. 2) stored in memory block 6, From the output of divider 8, the information enters the recorder, which records the value of the speed of movement according to the following expression: 90 N -N p-1 f where SQ cor.5-t is the length of the path at which, at the output of the frequency-pulse speed sensor 1, a pulse is generated. Next, the contents of the counter 5 are rewritten by the E memory block 6, the counter 3 is zeroed out, and the measurement cycle is performed again. Since N corresponds to an integer number of periods of the signal at the output of the pulse generator 2, and the difference N - Mn does not correspond to the integer number of periods of the signal at the output of the pulse generator 4, the maximum measurement error is determined only by the frequency of the pulse generator 4. The required measurement accuracy is unambiguously selects the frequency of the pulse generator 4. Thus, this device allows to obtain the required accuracy of the measurement of the speed of movement at a fixed measurement time and a given resolution; individuality frequency pulse rate sensor, which is important for automatic train control systems.

Claims (1)

DEVICE FOR MEASURING TRAIN SPEED OF TRAIN, 'comprising a frequency-pulse speed sensor connected to a pulse shaper, the output of which is connected to the counter input of the counter, and a generator of reference time intervals, the output connected to the installation input of the counter, characterized in that, for the purpose of improving the accuracy of measuring speed at a fixed measurement time and a given resolution of the frequency-pulse speed sensor, it is equipped with a pulse generator, a second counter, a memory unit, a umator, a divider and a recorder, the output of the pulse generator being connected to the counting input of the second counter, the installation input of which is connected to the output of the pulse shaper, the information outputs of the second counter are connected to the corresponding g inputs of the memory unit and adder, the outputs of the memory unit are connected to the corresponding inputs of the adder, outputs the first counter and the outputs of the sum, the matora are connected to the corresponding inputs of the divider, the outputs of which are connected to the corresponding inputs of the recorder, while the output is a generator reference torus slots connected to the write enable entry information storage unit. FIG. 7