SU1146801A1 - Device for digital encoding of rotational speed - Google Patents

Abstract

A DEVICE FOR CONVERSION OF SPEED. ROTATION TO A DIGITAL code containing a speed sensor, a generator of frequency, the output of which is connected to the first input of the first element And whose output is connected to the input of the first counter, the outputs of the first counter are connected to the inputs of the second element AND, and are the lower outputs device bits, the first RS flip-flop, the R-input of which is the start input of the device, and the direct output is connected to the first input of the third And element, the output of which is connected to the input of the second counter and S-in One second RS flip-flop, the output of which is connected to the second input of the first And element, the outputs of the second counter are outputs of the higher bits of the device, the fourth And element, characterized in that, in order to improve the accuracy, a one-shot and a D-trigger are introduced into it, the generator output of the reference frequency is connected to the input of the speed sensor and the synchronization input of the D-flip-flop, the output of the speed sensor is connected to the information input of the D-flip-flop, which is input through one. novibrator is connected to the second input of its element And, the output of which is connected i to the first input of the fourth element And, to (The second input of which is connected to the output of the second element And, the output of the fourth element And is connected to the S input of the first RS trigger, the inverse output of which is connected to R-input of the second rs-trigger.

Description

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The invention relates to automation and computing, is intended to convert the rotational speed in a wide range of changes in its values into a binary digital code and can be used to enter information into a computer.

A device for converting rotational speed to a digital code is known, comprising a speed sensor, a frequency converter - a code, a time interval converter - a code, triggers, And two-input elements, And three-input element, an inverter and three counters

At the output of such a device, three quantities are formed, each in the form of a binary code, from which the rotation speed can be calculated. The accuracy of the conversion decreases with increasing rotational speed, which narrows the measurement range.

The closest to the technical essence of the invention is a device for converting rotational speed into a digital code containing a sensor & sensor, a reference frequency generator, the output of which is connected to the first input of the first counter, the outputs of the first counter are connected to the inputs of the second And element and are the outputs of the lower device bits, the first RS flip-flop, the R-input of which is the starting input of the device, and the direct output is connected to the first input of the third And element, the output of which is connected to the input of the second counter and S-input of the second RS-trigger whose output is connected to the second input of the first AND gate, the outputs of the second counter are output MSB device rows, a fourth AND gate, and a third RS-trigger and a fifth AND gate 2.

However, the conversion of the rotational speed in this device is reduced to measuring the time interval determined by the arrival of a predetermined number of pulses from the speed sensor, while the disadvantage associated with the loss of accuracy in measuring high rotational speeds remains, thereby reducing the range of converted rotational speeds.

The purpose of the invention is to improve the accuracy of the device in a wide range of rotational speeds.

The goal is achieved by the fact that the device for converting rotational speed into a digital code, containing a speed sensor, generates a reference frequency, the output of which is connected to the first input of the first element I, the output of which is connected to the input of the first counter, the outputs of the first counter and are the low-order outputs of the device, the first RS flip-flop, the R-input of which is the starting

the device input, and the direct output is connected to the first input of the third element I, the output of which is connected to the input of the second counter and the S input of the second RS flip-flop,

the output of which is connected to the second input of the first element I, the outputs of the second counter are the outputs of the higher bits of the device, the fourth element I, the one-shot and the D-trigger are input, the output of the reference frequency generator is connected to the input of the speed sensor and the synchronization input of the D-trigger, the output of which is through the one-shot one to the second input of the third element And, the output of which is connected to the primary input of the fourth element And, to the second input of which is connected the output of the second element And, the output of the fourth element And is connected to S-in Ode to the first RS-flip-flop, the inverse output of which is connected to the R-input of the second RS-flip-flop.

FIG. 1 is a block diagram of a PST.

 Roads for converting rotational speeds to digital code; in fig. 2 - rotation sensor block diagram; in fig. 3 - one-shot blob; in fig. 4 is a timing diagram of the operation of the device for converting rotational speed to a digital code.

A device for converting rotational speed into a digital code contains a sensor 1 turn, D-flip-flop 2, one-shot 3, element 4, counter 5, RS-flip-flops 6

0 and 7, element 8, counter 9, generator 10 of the reference frequency, elements 11 and 12, input 13 of the sensor 1 turn, synchronization input 14 (C-input), information input 15 (D-input) and output 16 D- trigger 2, output 17 of the one-shot 3, R-input 18 RS-flip-flop 7,

5 output 19 of the generator 10 reference frequency, the inputs 20 and 21 of the counters 5 and 9.

The sensor 1 turns contains a gear wheel 22, a magnetic head 23, the amplifier 24 reading, the element And 25. The one-vibration 3

0 contains the elements OR 26 and 27, the element NOT 28, the differentiating chains 29 and 30, each of which contains a capacitor 31, a resistor 32 and a diode 33.

The rotation sensor 1 is a gear 22 mounted on a rotating shaft, the rotation speed of which is to be converted into a digital code, and a fixed reading element, which is a magnetic head 23, the reading amplifier 24 and the And 25 element.

0 These blocks are standard, widely used in tape drives, in commercially available angle converters — code DP-5, DP-2M, and other products.

The signal at the output of the read amplifier appears at the time of the coincidence of the tooth of the gear 22 with the magnetic head 23 and the whole time the tooth is stored

under the magnetic head 23. D-flip-flop 2 of the dynamic type with transfer of the information input signal to the output after the pulse decay at the synchronization input.

The single-vibration 3 serves to form short pulses along the front and in the decay of pulses applied to its input. Continuously, the output pulses are determined by the time values of the drive capacitors 31 and the resistors 32.

The device works as follows.

The pulses from the generator 10 of the reference frequency are passed to the output 15 of the sensor 1 if the tooth of the wheel 22 is read by the magnetic head 23, and it does not pass if the bottom is read. The width of the tooth of the wheel 22 is chosen to be equal to the width of the cavity, with the result that at the output 16 of the sensor 1 a sequence of packets of pulses and gaps between them of equal duration is formed (Fig. 4).

The pulse sequence from the output 15 of the sensor 1 is fed to the information input of the D-flip-flop 2, to the synchronization input of which the output of the generator 10 of the reference frequency is connected. At the output of D. Trigger 2, a sequence of pulses is formed, the fronts and decays of which are rigidly connected with the decay of the pulses of the generator 10 of the reference frequency, and the periodicity - with the rotation of the gear wheel 22. And 4 to the input 20 of the counter 5.

The signal "Start (from computer, control, device panel buttons) sets RS-flip-flop 7 to one state, as a result of which element 4 opens for passing short pulses to input 20 of counter 5. At the same time, the first signal from output of element 4 sets into one state, RS flip-flop 6, marking the initial time instant of the conversion.

Sensor 1, D-flip-flop 2, one-shot 3, element I 4, counter 5 and RS-flip-flop 7 perform the function of a frequency to code converter. The trigger 6 opens the element AND 8, through which the pulses of the generator 10 are fed to the input 21 of the counter 9, measuring the set time interval for the rotational speed conversion. Triggers 6 and 7, And elements 8, 11 and 12, the generator 10 of the reference frequency and counter 9 are a time-to-code converter.

0 After forming the specified code in the counter 9, i.e. after a predetermined time of converting the rotational speed into a digital code, the element 11 triggers, the signal from its output goes to the first

5 input element And 12. When the second input element And 12 pulse from the output element And 4, the output signal from the element 12 sets the RS-flip-flop 7 to zero. The signal from the inverse RS-TpHrfepa 7 output sets the RS-trig ger 6 to the zero state, as a result of which (the flow of pulses to the counters 5 and 9 is stopped. The contents of the counter 5 are proportional to the angle of rotation of the gear 22 of the sensor 1, and the contents of the counter 9 to the time of this turn.

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Claims (1)

DEVICE FOR TRANSFORMING SPEED. ROTATION TO A DIGITAL CODE containing a speed sensor, a reference frequency generator, the output of which is connected to the first input of the first element And, the output of which is connected to the input of the first counter, the outputs of the first counter are connected to the inputs of the second element And are the outputs of the least significant bits device, the first RS-trigger, the R-input of which is the start input of the device, and the direct output is connected to the first input of the third element And, the output of which is connected to the input of the second counter and S-input horned RS-flip-flop, the output of which is connected to the second input of the first AND element, the outputs of the second counter are the high-order outputs of the device, the fourth And element, characterized in that, in order to improve accuracy, a single-shot and D-trigger are introduced into it, the output of the reference generator frequency is connected to the input of the speed sensor and the synchronization input of the D-trigger, the output of the speed sensor is connected to the information input of the D-trigger, the output of which is through one. is the third of the vibrator connected to the second input? its And element, the output of which is connected to the first input of the fourth And element, to the second input of which the output of the second And element is connected, the output of the fourth And element is connected to the S-input of the first RS trigger, the inverse * output of which is connected to the R-input of the second RS-trigger.