SU1283815A1 - Device for determining the end of transient process in diagnostic systems - Google Patents

Abstract

This invention relates to automation and computer technology and is intended for use in self-tuning 1xc diagnostic systems. The goal of the invention is to increase the accuracy of determining the end of the transient process. The goal is achieved by using additional features of the end of the transition process. The device contains a low-pass filter, two differentiation units, three coefficients, three detectors, three keys, cyT & iaTopj elements AND, NOT and OR, a peak detector, a pulse generator, an amplifier, two pulse drivers, a Schmitt trigger waiting for a multivibrator . 2 or

Description

The invention relates to the VTS math and computing technology and to be used in self-adjusting diagnostic systems.

The purpose of the invention is to improve the accuracy of the device by determining the end of the transition process on the basis of additional features.

Fig. 1 is a block diagram of a device for recognizing the end of a transient process; in fig. 2 - time diagrams that explain his work.

A device for determining the end of the transition process contains a low-pass filter, a pair of 2 and second 3 differentiation units, the first 4, second 5 and third 6 comparators, element 7, first 8, second 9 and third 10 detectors, first 1, second 12 and third 3 keys, adder 14, fourth detector 15, pulse generator 16, element OR 17, element NOT 18, amplifier 19, Schmitt trigger 20, first 21 pulse shaper, waiting for multivibrator 22, second 23 pulse shaper.

The device works as follows.

The signal under study is passed through a low-pass filter 1, in which it is filtered from the high-frequency component of the mind, and then sequentially differentiated on blocks 2 and 3. Signals from filter 1 of the first 2 and second 3 blocks of differentiation go to the first inputs of the first 4, second 5 and 6 of the third comparators, where they are compared with the corresponding threshold values &,, 2 simultaneously arrive at the inputs of the first 8, Bioporo 9 and third 10 detectors. Coincidence of signals and outputs

the comparators 45 5 and 6 are fixed lo

In terms of the element And 7, when the inequalities x,; (t) U uo; x (t);, | x (t) lCA2, where x (t), x (t), x (t) are, respectively, the values of the signals at the outputs of the lowpass filter, the first and second differentiation units. At the same time, when the inequalities 1x (1) | nd are fulfilled: Ao; | x (t) | sA; I x (t) si D signals from the outputs of comparators 4, 5 and 6 are fed to the control inputs of nepBofo 11, the second 12 and third keys 13 Signals lx (t :),

ix (j) i, | x (t} with iii; xo ;;; H detectorsp 8, 9 to iO via keys, 12, and 15 enable inputs of summatl 14, Bi-i- l (;: one adder signal 14 (FIG. 2, a) is fed to the information input of the peak detector 15, the control input of which receives the voltage of high frequency from the high frequency pulse generator 16. The voltage from the peak detector output (FIG. 2 b) ) enters through the amplifier 19 to the input of a Schmitt trigger 20. At time t, the corresponding moment of coincidence of the signals detected by element And 7; the diode of the peak detector 15 (not shown) closes; prohozhdeg: s soko Bj | --astotnogo voltage in the time interval from t to tr, input signal monotonically decreases and thus there is a periodic reset the peak detector 1 5 (Figures 2, 5)...

At the output of the Schmitt trigger 20, a signal is triggered that triggers the pulse former 21. Pulses from the output of pulse shaper 21, FIG. 25H.) In the first input of the i-DlPi 17 element are fed to the reset input of the peak detector 15. To the second input of the OR element 17, an 18 pulse comes from the element 18 (FIG. -2.5) from the output element And 7, which for a period of time tt, | and with

tj resets the peak detector 15. At the same time, the pulses from the output of the first 21 pulse shaper arrive at the input of the waiting multivibrator 22 with a restart. The quasistable state of the standby multivibrator 22 is chosen to be much longer than the period of the pulses of the pulse generator 16. When the first pulse arrives at the input of the standby multivibrator 22, a high voltage level is formed at its output (Fig.2, |). The following pulses at its input maintain at the output of the waiting m :, the vibrator 22 a high voltage level. With the arrival of the last pulse at the output of the waiting multivibrator 22, the impulse j with a duration equal to the time of the quasistable state of the leading multivibrator is generated. Thus, at the output of the width of his multivibrator 22, a pulse is formed, the duration of which is equal to the time interval t, - t .. plus the time of a quasi-stable state

Claims (1)

waiting for the multivibrator 22. According to the negative voltage drop at the output of the waiting multivibrator (FIG. 2.9), the second 23 pulse shaper generates kmpuls (FIG. 2.5) on the leading edge of which is judged to complete the transient, the error in determining the end of the transient process is the time of the quasistable state of the slower L1 multivibrator decreases with an increase in the pulse period of the pulse generator. Invention Formula A device for determining the end of a transient process in diagnostic systems; containing a low-pass filter, the input of which is the device input, the first differentiation unit, the input of which is connected to the output of the low-pass filter, the second differentiation unit, the input of which is connected to the output of the first differentiation unit, the first, second and third comparators, whose inputs are connected respectively to the outputs of the second, first differentiation units and the low-pass filter, the element I, the inputs of which are connected to the outputs of the comparators, characterized in that, in order to increase the accuracy of the device, The first, second and third keys of the first, second are entered into it. 0 ; tertr-sh and fourth detectors, sum -or, pulse generator, amplifier, trigger W, waiting for a multi-vibrator. The first and second pulse shapers S are NOT the element and the OR element, and the inputs of the first, second and third detectors are connected respectively to the filter outputs of the lower frequencies, the first and second differentiation units, and the outputs, respectively, to the information inputs of the first, second and third keys, the control inputs of which are connected respectively to the outputs of the first, 5 of the second and third comparators, and the outputs from the Ex-w of the adder, the output of which is connected to the information input of the fourth detector, the control input of which is connected to the output of the pulse generator, and the output to the input of the amplifier, whose output is connected to the trigger input of Pmitt, the output the latter is connected to the input of the first forcing pulses, the output of which is connected to the input of the waiting multivibrator and the first input of the OR element, the output of which is connected to the reset input of the fourth detector, and the second input to the output of the element OR, the input of which is connected to the output of the element AND, the input of the second driver and mycov is connected to the output of the waiting multivibrator, and the output is left of the device five gz IS d cfjfjff. 2