SU1273871A1 - Meter of time intervals - Google Patents

Abstract

This invention relates to a measurement technique. It can be used, for example, to measure the rotational speed of an engine with a pulse velocity sensor mounted on its shaft or to generate a regulating signal in the digital input to a speed control system on the drives of rolling mills of nurf ... j-.jfj of metallurgical production. The purpose of the invention, to reliably measure measurements, is achieved by eliminating false information during bounce in the pulse sequence of the input signal. Such bounce can take place, for example, for the case of metal slipping at the entrance to the mill rolls of blooming. An electronic key 9, a write pulse shaper 10, a binary counter 1, a digital comparator 13 and a persistent storage device 14 are entered into the device. In addition, the device contains the shaper 3 of the input signal on the operational amplifier, control unit 4, an AND-NOT element 5, generator 6, block 7 counting decades, display block 8, register 12. The control unit contains D-triggers 15 and 16, RC circuit 17, AND-NE element 18. Shaper 10 contains RC-circuit 19, AND-HE element 20. Electronic key 9 is made on the elements 2NE 21 to 22, 2I-NOT 23 and 24. 2 Il. H

Description

The invention relates to a measuring technique and can be used, for example, to measure the speed of an engine with a speed sensor mounted on its shaft or to generate a signal of adjustable influence in a digital-analogue speed control system at steel mill drives.

The purpose of the invention is to increase the reliability of measurements by eliminating false information when the bounce in the pulse sequence of the input signal.

Figure 1 shows the functional diagram of the device; figure 2 - timing diagrams.

The time interval meter contains a divider 1, a probe 2, an input signal conditioner 3, which is a limiter amplifier assembled on an operational amplifier, a control unit 4, a selector 5 (AND-NOT element), a crystal oscillator 6, a block of 7 counting decades, a block 8 indications, electronic key 9, shaper 10 write pulses, binary counter 11, register 12, digital comparator 13 and read-only memory (ROM) 14.

The control unit 4 is formed by two universal D-triggers 15 and 16, an RC circuit 17 and an NAND element 18.

The shaper 10 write pulses contains the RC circuit 19 and the element 20 AND-NOT.

The electronic key 9 includes the elements 2HE 21 and 22 k of the elements 2I-NO 23 and 24.

The divider 1, the probe 2, the shaper 3 of the input signal and the control unit 4 are connected in series, the output of the generator 6 is connected to the second inputs of the selector 5 and the block 4 and the counting input of the binary counter 11 whose outputs are connected to the information inputs of the register 12, the outputs of which are connected: the first group of inputs of the digital comparator 13, the second group of inputs of which is connected to the outputs of the ROM 14, the output of the comparator 13 is connected to the control input of the electronic key 9, the first input of which is connected to the second output of the control unit 4, the reset input of the binary counter 11, the second input of the key 9 is connected to the recording entry of the register 12 and the output of the writing pulse generator 10, the first input of which is connected to the first output of the control unit 4 and the selector 5, the output of which is connected to the counting input of the 7 counting decades block, the outputs of which are connected to the information inputs of the display unit 8, the recording input of which is connected to the second output of the electronic switch 9, the first output of which is connected to the reset input of the block 7, the third output of the control unit 4 is connected to the second input 10 l of recording pulses. C-inputs D-flip 5 of gerov 15 and 16 are combined and connected to the second input of block 4, inverse S- and R-inputs are combined and connected. to the l.D-bus input trigger 15 is the first input of block 4, direct

0 output) -the trigger 15 is connected to the P-input of the trigger 16 and is the first output of the block, the inverse output of the trigger 15 is the third output of the block 4, the direct output of the trigger 16 through

5 RC circuit 17 and the inverse is directly connected to the inputs of the element IS-HE 18, the output of which is the second output of block 4, the first input of the driver 10 through the RC circuit 19 of the sub30 is connected to the first input of the element IS-NOT 20, the second input of which connected to the second input of the imaging unit 10, and the output - with the output of the imaging device, the inputs of the key 9 through the elements 2NE 21 and

5 and 22 are connected to the first and second inputs of elements 2I-NOT 23 and 24, the third and fourth inputs of which are combined and connected to the control input of the key 9, and the outputs of elements 2I-NOT 23 and 24

0 are its outputs.

The meter time intervals works as follows.

The input of the divider 1 receives the measured pulse sequence,

5 then the signal goes to probe 2, from the output of which (4ig.2a) goes to shaper 3 and then to the input of control unit 4 (fig.2b). The control unit 4 generates a strobe pulse,

 equal in duration to the measured pulse output ((.2m, m). Selector 5 performs the function of a temporary gate for counting pulses (Fig. 2n), it opens for a while

Claims (1)

5 actions of the strobe pulse, coming from the output of the control unit 4. A highly stable pulse sequence is output from the output of the quartz oscillator 6 (Fig. 2) to the input of the selector 5. The block of counting decades 7 counts the 5 pulses received from the selector output and writes the counting results to the registers of the display block .8. The recording pulse (Fig. 2) of the display unit performs the interpretation of the measurement results and the indication. The control unit 4 also generates the reset pulses (Fig. 2c) of the counting decades in the zero state before each measurement, which arrive at the reset input of the counting decades 7 through the electronic key 9. (Fig. 2k); Forming 10 write pulses generates write pulses on the falling edge of the strobe pulse coming from the output of control unit 4. The binary counter 11 counts the pulses arriving at its input from the output of the crystal oscillator 6. The binary of the counter I1 is reset to the zero state by the reset pulses generated by the control unit 4. (Fig. 2). The binary code corresponding to the current pulse duration of the input signal T, the output of the nocTynaet binary counter to the input of register 12, is written to the register by a pulse from the output of the driver 10 write pulses. From the outputs of register 12, the binary code is fed to a digital comparator 13. From the outputs of the ROM 14 to the inputs of the digital comparator, a binary code is received, corresponding to the shortest duration of measured pulses T,. The digital comparator, which performs the T / iik-TK subtraction operation, compares the current value of the pulse duration of the measured signal with the T setting, and there is a bounce, the result of the subtraction is positive, i.e. O is present at the comparator output (FIG. 2). The signal from the output of the digital comparator 13 is fed to the control input of the key 9 and in this case prohibits the passage of a reset pulse to the block of 7 counting decades and a write pulse to the block 8 of the display, i.e. in the display unit 8, the information which is indicated is stored. If there is no bounce, the digital comparator 13 will generate a signal 55 1 at the output, which opens the electronic key 9 for the passage of a reset pulse to the block of 7 counting decades and a recording pulse to the block 8 of the display, i.e. the information in blocks 7 and 8 is updated. Figure 2 shows the time diagrams of signals at ten points of the circuit (a, b, e, m, ni, n, (j, 3, i, k, P) of which are temporal relationships between the signals at the considered points. Block 4 control in conjunction with the write pulse shaper 10 operates as follows: Clock inputs of frequency f, i MHz are received at inputs C of the flip-flops 15 and 16. A measured signal is received at the D input of the flip-flop 15. At the output of the first trigger (Fig. 2t) positive impulse whose duration is a multiple of the impulse period f. This pulse is En according to the duration of the input (measured) pulse T,. Antiphase signals (the feed goes to the driver 10 write pulses at the moment of transition 1t | from I to O, i.e. after the strobe pulse ends, the output is Record (fig. 2e) a short pulse is formed. The second trigger on the output forms a differential from 1 to O with a delay relative to the signal m by 1 µs, and therefore, a reset pulse (Fig. 2c}) is formed with a delay relative to the recording pulse by 1 µs, then it first provides a recording of information in the register, and then the resetting of the counter, the formula invented and A time slot controller containing a Hbie divider in series, a probe and a shaper of the input signal, the output of which is connected to the first input of the control unit, the output of which is connected to the first input of the selector, the second input of which is connected to the output of the quartz oscillator, and the output is connected to the input of the counting decades unit, the outputs of which are connected to informational inputs of the display unit, characterized in that, in order to increase the reliability of the measurements by eliminating false information during bounce in the pulse The sequence, in which has been entered electronic key, a write pulse generator, binary schegchik, register. digital comparator, permanent memory, the second input of the control unit is connected to the output of the crystal oscillator and the counting input of the binary counter, the reset input of which is connected to the second output of the control unit and the first input of the electronic key, the second input of which is connected to the output of the write pulse generator and the input register entries, the information inputs of which are connected to the outputs of the binary counter, the outputs of the register so12 71 dineny with the first group of inputs of the digital comparator, the second group of inputs which is connected to the outputs of the persistent storage device, the comparator output is connected to the control input of the electronic key, the first and second outputs of which are connected respectively to the reset input of the counting decades block and the recording input of the display unit, the first and third outputs of the control unit are connected respectively to the first and second the inputs of the pulse shaper record. ll lpl ll-po. 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