SU871071A1 - Device for checking rotation parameters - Google Patents

Description

(54) DEVICE FOR THE CONTROL OF ROTATION PARAMETERS

The invention relates to a control and measurement technique, in particular to low-inertia devices for controlling the speed of rotation and acceleration. In addition, the device can be used in automatic control and monitoring systems in which information is presented in frequency form. Devices for monitoring rotational speed are known, containing frequency-Hbie sensors and built on the principle of comparing the period of the signals of these sensors with a reference time interval. These include the device that includes the speed sensor, the driver of the input signals, the driver of the reference interval, the time, the memory device, and the driver of the output signals. The device uses an analog driver for a reference time interval, tunable using a time circuit consisting of a resistor i of a capacitor c1. A significant disadvantage of this device is the low accuracy and stability of the response threshold, since the temperature and time drift of the parameters of resistors and capacitors reaches several percent. A device is known for monitoring rotation parameters, which has a high speed of monitoring rotation parameters and eliminates false triggering when exposed to interference or loss of signals from the G2D speed sensor. This device includes, as main functional units, a speed sensor, an input driver, a period duration analysis unit, first and second conjunctors, a first disjunctor, an output driver, a second disjunctor, a third conjunctor, a blocking pulse former, and the first and second comparison circuits and the period duration analysis block may consist of a control block, a reference frequency generator, a counter, and a period code processing block. The drawback of the device is the narrow range of the rotational speed and which excludes the false operation of the device when monitoring rotation parameters in terms of interference or interruptions of the speed sensor signals. This range is in the range of / ,, and - 1 V1 /, bei, ah 0.5, respectively, the minimum and maximum speed of rotation in a given range; controlled speed of rotation. The aim of the invention is to expand the range of the rotational speed in which the false triggering of the device is prevented when operating under conditions of single noise or interruptions of the speed sensor signals. The goal is achieved by the fact that a series of averaged unit and a control unit of the current period are entered into the device, with the fourth output of the period analysis unit connected to the input of the averaging unit and to the second input of the current period control unit, the first output of which is connected to the third input the first conjunctor, the second output with the first input of the second disjunctor, and the third output with the second input of the second disjunctor and the third input of the first disystor. FIG. 1 is a diagram of a proposed device for monitoring rotational parameters; in fig. Figure 2 shows one of the possible options for the implementation of the proposed device for controlling rotation parses. The structure of the device as the basis of functional units includes a speed sensor 1, a driver for input signals 2, a block for analyzing the length of a bone of periods 3, a first conjunctor, a second conjunctor 5, a first disjunct 6, a shaper of output signals 7, a second disjunctor 8, a third conjunctive 9 shaper blocking pulses 14 ow 10, averaging block 11 and a current period control block 12. In the above apparatus for controlling rotation parameters, an extension of the rotation speed range in which false alarms are prevented during operation JVI x interference or speed sensor interrupt signals is accomplished as follows. As already noted, one of the requirements that must be met to avoid false triggers is the fulfillment of the conditions C |), and under these conditions, the values of E and E are constant. This significantly limits the range of rotational speed, in which the rotation parameters are monitored with the exception of false alarms when operating in the conditions of interference or interruptions of the signals from speed sensor 1. In the proposed device, the values of Yy, | and uif x are selected variable and dependent on the averaged value of the rotation speed. . J;,. .), - variables corresponding to the upper and lower limits of the range of rotational speed; the averaged value of the rotational speed tU-j j j is the sample value (the number of input periods of the speed sensor); a and b coefficients of proportionality. , From conditions C2) it is clear that the relationship between the upper and lower limits of the range of rotational speed, as well as in condition (1), cox: is injured. However, this condition does not limit the rotation speed range, since the values (HiOnx tx depend on the averaged value uJj and, as it were, track changes in the values of the rotation speed w. For a more gradual change in the values of oi and tsns, it is better to take a sample of the number of averaging periods. 5 The values of the coefficients a and b go tc as follows: From conditions (2) we have: o; - (11 max-o-vriitt Accepted e 1 + l а 1 -А we get D оГзГ); а 0,6 (); 1.30 Since the averaged value of if. Lags in phase from the current value, the coefficients a and b should be taken as you are corrected: the value of the coefficient c 0.6 () should be increased, and the coefficient b 1.3 () reduced. The magnitude of the correction depends on the dynamics of the controlled process, the type of averaging and the sampling value of the number of averaging periods, and therefore The device works as follows: The next signal from the speed sensor 1, corresponding to the end of the period and the beginning of the period T, goes to the driver of the input signals 2, which generates a pulse that triggers the input period analysis block 3. In the analysis block 3, the analysis of the rotation parameter is performed by analyzing the duration of the periods of the signals from the speed sensor 1, and if the value of the rotation parameters exceeds the maximum permissible value, then the output of the Avari block 3 shows the output of the analysis block 3. If this value turned out to be less than the maximum permissible value, then the signal Norm appears at the second output of the analysis block 3. After one of the outputs of the analysis block 3 receives the Avarí or Norma signal, its third output has a short pulse that goes to conjunctors 4, 5 and 9. Moreover, if the first output of the analysis block 3 is If the Avars signal is at the third input of the first conjunct 4, there will be an enabling signal, then the pulse will go through the conjunctor 4 to the first input of the output signal generator 7, which will form the output signal only after accumulation. 16 neither has two or more of the following additional pulses. If, on the second output of the analysis unit 3, the Norma signal is given by Wits, then the pulse, which appeared on its third output, will go through the conjunctor 5, the disjunctor 6 to the second input of the output signal generator 7 and set it to its initial state, at which the signal to its no output. At the same time, information on the duration of the period T comes from the fourth, the output of the analysis unit 3 to the second input of the control unit I2 and the input of the averaging unit I1, where the averaging duration of j periods occurs. After averaging, the information on the averaged value of the duration of j periods goes to the input of the control unit 12, producing values where (H values produced are compared with the value of the input period T. Three cases are possible. Case D. The T value is in JtJL Then on the first The output of the control unit I2 will be a permitting signal, which will go to the third input of the first conjunctor 4, and the second and third outputs will provide the inhibiting signals. This case corresponds to the operation of the device in the absence of interference or interruption signals of the speed sensor 1. Case H T. Value T, Then the first and third outputs of the control unit 12. prohibit signals will be, and the second output - the enabling signal, which, having passed through the second disjunctor 8, will go to the first input of the third 9. The inhibiting signal from the first output of the control unit 12 to the third input of the first conjunctor 4 blocks it, and if after this, the alarm at the first output of the analysis unit 3 shows the Alarm, then the pulse then comes from the third output of the analysis unit 3, will not go to form l 7. When the output signals of this pulse at the output of the third vivshiys analysis unit 3, through another posupit conjunctor 9 ormirovatel blocking pulses 10 and runs it. The signal from the output of the blocking impulse device with duration D, whereC is 2T,

7

will go through disjunctor 6 to the second input of output driver 7 and set it to its initial state.

In this case, the first input of the output driver 7 will be blocked for the duration of the pulse t.

This case corresponds to the operation of the device under single-noise conditions.

Case Sh. Meaning.

Then, on the first and third outputs of the control unit 12, the enable signal is turned on, and on the second output, the inhibiting signal.

The permissive signal, which appeared at the third output of the control unit 12j, passes through the first disjunction 6 and goes to the second input of the output signal generator 7 and sets it to its initial state.

At the same time, the enabling signal, which appeared at the third output of the control unit 12, will go through the second disjunctor 8 to the first input of the third KoiibmHKTOpa 9. In this case, the impulse from the third output of the analysis unit 3 will pass through the third conjunctor 9 and start the blocking impulses 10. The signal from the output of the forcing device the blocking pulses 10 will arrive at the first input of the first disjunctor 6. And from the moment when the permitting signal disappears at the third output of the control unit 12, a signal will arrive at the second input of the output signal generator 7 al with blocking pulse shaper 10.

In case a trigger pulse arrives from the conjunctor 9 before the end of the pulse time, the driver 10 will start again and its pulse will continue for a further time t; .

The third case corresponds to the operation of the device when the signals of the speed sensor 1 are interrupted.

As an example in FIG. 2 shows one of the possible implementation options of the proposed device for controlling rotation parameters.

In this device, the unit of analysis. input periods 3 controls the acceleration of rotation according to the formula tl). It consists of the control device 13, implemented in the form of a pulse distributor, the generator of the reference part 14, the counter 15, the encoder 16, bl8

ka multiplication 17, the block of the difference of periods 18, made in the form of a countdown counter, comparison circuit 9.

The averaging block 11 is made on two reversible counters 20 and 21, conjunctor 22, countdown counter 23, disjunctor 24, and trigger 25. It averages the duration of the follow-up periods of the input signals using the formula: f.

j-t-i- j

T. T. 1 + 1 d m

where T. is the current period of input

4-1

 signals;

T, - the average value of M

previous periods; M - sample periods. The control unit of the current period 12 is made in the form of two triggers 26 and

27 and two countdown counters

28 and 29, in which the value of the number N is equivalent to the average value of the duration of eight periods T. In addition, the control unit 12 contains two reference frequency generators 30 and 31, the pulses of which write the numbers N, and the values of the frequency of the pulses of these generators determine the factors a

and b,

The output driver 7 is made in the form of a counter, the blocking pulse consists of the Schmidt trigger and the time of the driving RC circuit.

The device shown in FIG. 2 allows one to control the angular acceleration modulo (simultaneous control of the positive and negative limiting angular acceleration).

Introduction to the known device of the averaging unit 11 and the control unit of the current period 12 and communications has significantly expanded the range of operation of the device while maintaining protection against false positives caused by the action of single interference or interruptions of the speed sensor signals

Claims (2)

Invention Formula A device for monitoring rotation parameters, containing a series-connected speed sensor, input driver, period analysis unit, first conjunctor and output shaper, the second input of which is connected to the output of the first disjunction, the first input of which is connected to the output of the second conjunctor, and the second input is via the shaper of the blocking pulses with the output of the third conjunctor, the first input of which is connected to the output of the second disjunction, while the second output of the analysis unit The period is connected by the first input of the second conjunctor, and the third output is connected to the second inputs of the first, second, and third co-junction devices, characterized in that, in order to expand the range of speed of rotation, which eliminates the false triggering of the device during single interruptions or interrupts signals of the speed sensors, a connected averaging block and a current period control block are inserted in series 1O into it, with the fourth output of the period duration analysis block connected to the input of the averaging block and a second input unit controlling the current period, the first of which vpsod connected to the third input of the first conjunctor, dtoroy yield - C: vtopogg disjunctor first input and a third output - with vtorpy input of the second and third disjunctor yHvdom first disjunctor. Sources of information taken into account in the examination 1. Swiss patent number 543743, cl. G 01 P 3/44, 1973. 2. USSR author's certificate in application number 2801076/21, cl. G 01 P 3/48, 1979 (prototype). Sh