SU1097973A1 - Device for checking time of transient process - Google Patents

Abstract

A DEVICE TO CONTROL THE TIME OF THE TRANSITION PROCESS, containing the first and second threshold block. ki, the inputs of which are connected to the input of the device, and the outputs with the corresponding inputs of the NAND element, a counter, the counting input of which is connected to the output of the stable frequency generator, and the setup input to the first output of the control unit, the second output of which is output devices, and the first and second inputs of the control unit are connected respectively to the output of the Stimulating signal generator and to the device launch input, which is characterized in that, in order to increase the speed of the device, a comparison and registration unit is entered into it p., the control input of which is connected to the output of the NAND element, the information input is connected to the output of the counter, and the output is connected to the first information input of the comparator, (L whose second information input is the master input of the device, and the control input connected to the third output of the control unit, the third input of which is connected to the Stop input of the device.

Description

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P1

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The invention relates to the control of measuring equipment and can be used to control the dynamic parameters of various objects of regulation in the construction of information-measuring systems. A device for controlling the duration of transient processes is known, which includes pulse shapers of the measured and reference frequencies, a reversible counter, a comparator block. However, this device is characterized by a low control accuracy due to the double conversion of the code obtained on the counter to analog value. A device for the visual control of a transient process is known, including a generator of stimulating signals and a comparison circuit C23. The disadvantage of this device is that, allowing only visual control of the transient process, it eliminates the possibility of automating measurements and provides a low reliability of control. The closest to the present invention is a transient time measurement device containing two threshold blocks, two AND-NOT logic elements, a time interval meter with separate Start, Stop, two counters, the first of which serves to form a sign of the end of the transition process and generating a Stop signal, and the second - to delay the start of the time interval meter for a time equal to the filling time of the first counter, the stable frequency generator, the control unit; the signals, the input and output of the device w, the corresponding connections between them C3J. A disadvantage of the known devices is the low speed, due to unproductive time expenditures in determining the time, process interruption, caused by the preliminary delay of the start of the time interval meter at time tj equal to the time of filling the Stop signal generation counter. The speed of devices, equal to the average time of the test, is defined by the expression where T. is the processing time of the i-th recallation} n is the number of implementations. In the known device, the value of T is T, - t, ..- tj where tpj is the measured value of the transient time of the i-th automatic control system under test (ACS ;, h is the start delay time of the time interval meter, equal to the time taken to fill the output counter of the characteristic Stopping and determining the end of the transition process. In the prototype, in order to prevent the time meter from stopping until the end of the transition process, the filling time of the signal generation counter Stop must be selected. Longer than the oscillation period (T) of the transient process of the tested ACS. On the other hand, to ensure the functionality of the prototype, the value of tj, strictly determined by the filling time of the corresponding counter, must be greater than the maximum possible value of T specified for the prototype of the ACS class. the number of oscillations beyond the time of the transient process is within the range of 2–4, which determines the value of T, and, accordingly, the value of the overhead of the prototype tj is within 50–25% of the maximum value time transition pro- cession. I. In addition, when checking ACS with auto-oscillation amplitudes or static ombi values greater than the dimension of the error zone (cases typical of tuning and troubleshooting) f, the known device does not generate a sign. Stop corresponds to the first counter and an external intervention occurs. This dramatically increases the unproductive expenditure of time tj, reduces the speed of the device and leads to the absence of an estimate of the tested ACS. The purpose of the invention is to increase the speed of the device. This goal is achieved by the fact that the device for controlling the transient time, containing the first and second threshold blocks, whose inputs are connected to the input of the device, and the outputs — to the corresponding inputs of the NAND element, the counter, the counting input of which is connected to the output of a stable frequency generator and the setup input to the first output of the control unit, the second output of which is the first output of the device, and the first and second inputs of the control unit are connected respectively to the output of the generator stimulating the signal and a trigger input

devices, a comparison block and a register are entered, the control input of which is connected to the output of the NAND element, the information input is connected to the output of the counter, and the output is connected to the first information input of the comparison block, the second information input of which is the master input of the device, and the control Inputs are connected to the third output of the control unit, the third input of which is connected to the stop input of the device.

The drawing shows a block diagram of a device for controlling the time of the transition process.

The device contains threshold blocks 1 and 2, the logical element IS-HE 3, register 4, specifies the device input 5 for setting the permissible time of the transient process, the comparison unit 6, the stable frequency generator 7, the current time counter 8, the control unit 9, the output 10 of the device connected to the input of the monitored system, inputs 11 and 12 of the device for setting the signals respectively. Stop and Start, a generator of stimulating signals 13, input 14 of the device connected to the input of the monitored system.

At the same time, threshold blocks 1 and 2 serve to generate 1 at their outputs if the current value of the output signal of the monitored system is greater than the first and lower than the second threshold levels, respectively, with the second threshold level modulo more than the first threshold level. If the above condition (conditions) is not met At the corresponding output (outputs I of the comparison units, according to O.

The output of the NAND 3 logical element will be O if the output signal of the controlled system is greater than the first and less than the second threshold levels, i.e. find. ts in the error zone (tube), otherwise the output of the NAND element will be 1. Register 4 is designed to store the code of the current time value from the moment the PuK signal was sent to the device input 12 until the moment of the last occurrence of the flowing value of the output signal of the system being monitored . Comparison unit b compares the permissive signal received at its control input from the output of control unit 9 of the measured transient time (tfll stored in register 4 with the admissible transient time (tf, |) specified from device 5, and forms a sign of pre-peneep when the condition is met

L

The generator 7 and counter 8 form the code of the current time value from the moment the zero signal is removed from the installation input of the counter. Block 9, when a start signal arrives at the input 12 of the device, the Start produces a connection of a stimulating signal from the generator of the stimulating signals 13 to the output 10 of the device and further to the input of the controlled system. According to the Stop signal, which is fed to the device input 11, the control unit 9 generates a signal to the control input of the comparison unit b, blocks the output

5 of the stimulating signal from the generator of the stimulating signals 13 to the output 10 of the device, and then generates a zero signal to the installation input of the counter 8.

In a time control device

0 of the transient process, the measurement interval of the transient process of the controlled system is limited by the time i selected in accordance with the requirement of the controlled

5 cHCTeNM. If necessary, the transition process for the measurement interval tf, the latter takes the value

p - b The device works as follows.

To the beginning of each control cycle, the value of the transient time from the output

5 control unit 9 zero signal

enters the installation input of the counter 8, resetting it to zero, input 14 and output 10 of the device are connected respectively to the output and input of the controlled system. Then at the entrance

.12 of the device, a Start signal is given, through which the control unit 9 connects a stimulating 1; s signal to the input of the monitored system and. one5

. temporarily removes the zero signal from the installation input of the counter 8,

, after What begins its filling ..

When the value of the output signal

0 controlled system is not in the area of the tube the contents of the counter B, ow -. its value from the time the Start signal arrives and the stimulus signal is applied to

5 input of the controlled system is rewritten to register 4. When a stop signal arrives at the input 11 of the device, at a measurement interval tn from the moment the signal was given

0 Start and control unit 9 blocks the release of a stimulating signal and simultaneously produces a synchronizing signal to the input of the comparison unit b. The latter compares the measured time value 10979 of the transient process tf with the maximum time signal, generating an excess signal when the excess condition is satisfied, then the control unit 9 generates a zero signal at the input of the counter 8, resetting it to 5 zero. In the proposed device, by excluding the time interval meter and the counter, introducing the register and the corresponding connections, the processing time T is determined by the interval between the moments of the Start and Stop signals arrival, is set in accordance with the requirements of the tested ACS and can be equal to -15 3 time of its transient process j, which eliminates unproductive time losses, the possibility of cycling in the operation of the device and provides a faster speed compared to the prototype. The application of the proposed device in the systems, their operation in real time (automated process control systems, etc. |, allows, in comparison with the prototype, to increase the availability of these systems and reduce the consumption of their resource by 25-50% control by reducing the time control T - and the average time control, respectively.

Claims (1)

DEVICE FOR MONITORING TRANSITION PROCESS TIME, containing the first and second threshold blocks. ki, the inputs of which are connected to the input of the device, and the outputs - with the corresponding inputs of the NAND element, a counter, the counting input of which is connected to the output of the stable frequency generator, and the installation input to the first output of the control unit. the second output of which is the output of the device, and the first and second inputs of the control unit are connected respectively to the output of the Stimulating signal generator and to the start input of the device, which is characterized by the fact that, in order to increase the speed of the device, a comparison unit and a register are entered into it, which controls the input which is connected to the output of the AND-NOT element, the information input is to the output of the counter, and the output is connected to the first informational input of the comparison unit, the second information input of which is the setting input of the device and the control input is connected to the third output of the control unit, the third input of which is connected to the • stop input of the device.