SU1104472A1 - Automatic controller for multichannel entity - Google Patents

Abstract

DEVICE FOR AUTOMATIC. CONTROL OF MULTI-CHANNEL OBJECT Containing unifying converters, inputs connected to device inputs, and outputs - to information inputs of switch contact key elements connected by control inputs through a first decoder to outputs of a ring counter, a comparator, the first input connected to the output of a settings block, and the second input - with interconnected outputs of the contact key elements of the switch, display unit, the control inputs of which are connected to the address outputs the first decoder, the information input is connected to the output of the comparison unit, and the reset input is connected to the first output of the control unit and the reset input of the ring counter, characterized in that. in order to increase the reliability of the device, a counter, a second decoder, a register, a third decoder, a reversible counter, a multiplexer and a frequency divider are inputted to it, the information input of the counter is connected to the output of the comparator unit, the reset inputs of the counter and the register are connected to the first additional output of the first decoder , the outputs of the counter are connected to the inputs of the second decoder, the outputs connected to the inputs of the register, the first, second, third and fourth outputs of which are connected respectively to the first, second, The third and third decoder receivers and fourth entrances, the fifth input of the first decoder connected to the second auxiliary output and the counting input of the reversible counter, the sixth input - the first output of the control unit and the control input of the frequency divider, and the seventh input - to the output of the reversible counter and address inputs the multiplexer, the informational inputs of which are connected to the outputs of the frequency divider connected by the information input to the second output of the control unit, the output of the multiplexer is connected to the informational th input of a ring counter and a strobe input of the comparison unit, wherein the first, second and third outputs of the third decoder are connected respectively to the control inputs of summation, subtraction and reset control down counter.

Description

The invention relates to measurable information systems and can be used for operational monitoring of multi-channel objects, the failure criterion of which is the failure of the same type of monitored channels (for example, when monitoring sensors of receptor fields in recognition systems, receiving-amplifying paths of fishing acoustic systems). stations, fields of sensors of large-area seismic stations, solar cell elements, etc., where the average frequency of failures is relatively constant The device for centralized control with cyclic opipocoM sensors, containing a generator of fp pulses, a switch with contact key elements, controlled by the meter} channel of automatic measurement, channel of linearization of sensor characteristics, control channel, display and recording unit, and Also, the measurement unit for the call DU D. The disadvantages of this device are its considerable complexity and short lifetime of the contact switch. Closest to the invention The technical essence is a device for automatic control of a multichannel object, containing unifying converters, inputs connected to device inputs, and outputs - to information inputs of contact key elements of a switch connected by control inputs through the first decoder. ring counter, the comparison unit, the first input connected to the output of the setpoint block, and the second input - with the combined outputs of the contact key elements The commutator, the display unit, the control inputs of which are connected to the address outputs of the first decryptor fopa, the information input is connected to the output of the comparator unit, and the reset input is connected to the first output of the control unit and the reset input of the ring counter. The output signals are connected in series unifying converters to the input of the unit, compared, where they are compared: with the settings generated by the setting unit, and the comparison results are sent to the display unit z. A disadvantage of the known device is the low reliability of switching the contact key elements of the switch due to the high frequency of its switching, which must be installed to ensure the minimum risk of not failing the object. The aim of the invention is to enhance; device reliability due to the possibility of automatic control of the switching frequency of the switch. The goal is achieved by those. That a counter, a second decoder, a register, a third decoder, a reversible counter, a multiplexer and a frequency divider are entered into the device for automatic control of a multi-channel object, the information input of the counter connected to the output of the comparator, the reset inputs of the counter and register are connected to the first additional output of the first decoder , the counter outputs are connected to the inputs of the second decoder, the outputs connected to the inputs of the register, the first, second, third and fourth outputs of the iToporo are connected respectively to the first The second, third and fourth inputs of the third decoder, the input connected to the second additional output of the first decoder and the counting input of the reversible counter, the sixth input to the first output of the control unit and the control input of the frequency divider, and the seventh input to the outputs of the reversible counter and the address of the multiplexer, the information inputs of which are connected to the outputs of the frequency divider connected by the information input to the second output of the control unit, the output of the multiplexer is connected to ormatsionnym input of a ring counter and a strobe input of the comparison unit, wherein the first, second and third outputs of the third decoder are connected respectively to the control inputs of summation, subtraction and reset control down counter. In the proposed device, at the end of each control cycle, the total number of failed channels is analyzed. If this number does not exceed 1/3 K, where K is the object failure criterion (the number of failed channels for which the control object is considered faulty), then in the next monitoring cycle, the switching frequency of the switch decreases twice. If at the end of any cycle the number of failed channels is in the range 1/3 K - 1/2 K, then in the next cycle the switching frequency remains the same. If the analyzed number of failures is between 1/2 K and 2/3 K, then in the next cycle the switching frequency is doubled. If at the end of any monitoring cycle the number of failed channels exceeds 2/3 K, then, regardless of the switching frequency of the last cycle, the maximum switching frequency at which the device began its operation is set. Thus, with a relatively constant real failure rate, there is a small risk of not detecting a malfunction of the object in time, and at the same time the switching frequency of the switch is reduced, which increases the reliability of the contact key elements. The drawing shows a diagram of the proposed device for automatic control of a multi-channel object. The device contains unifying converters 1 for converting input signals into a unified electric signal, switch 2 which is intended for switching output signals of converters 1 and contains contact key elements 3, ring counter 4 and the first decoder 5, comparison unit 6, which serves to compare the unified signals with the settings from the setting unit 7, block 8 indie for controlling the results of the control, control block 9, which is used to generate clock pulses and control the operation of the device, counter 10, which records the number of failed channels, the second decoder 11 serves to control the (three-bit) register 12 on the triggers 13, which serves to control the third decoder 14, which is designed to control the reversible counter 15 and contains elements AND 16 - 18, elements OR 19 and 20 and the element IS-HE 21, multiplexer 22, which serves to connect the pulses divided frequency from the frequency divider 23 to the counter 4 of the switch 2, depending on the code at the output of the reversing counter 15. Block 9 contains a generator 24 clock pulses, element 25 and trigger 26. The device works as follows. A one-time start pulse, received from the operator's console through control block 9, resets the counter 4, the display block 8, the reversible counter 15 and the divider 23 to the zero state. At the second additional output of the decoder 5, a signal 1 appears, resetting to zero the state of the counter 10 and the register 12. The clock pulses of the generator 24 of the control unit 9 begin to arrive at the input of the frequency divider 23. The latter is a conventional binary counter, the pulse frequency at each of the subsequent outputs of which is two times less than the previous one. The output code of the reversible counter 15 set to the zero state connects to the output of the multiplexer 22 that output of the divider 23, the pulse frequency at which is maximum. These pulses are passed to counter 4, which, with the arrival of each successive pulse, changes its state, and at the outputs of the decoder 5, a signal appears in turn opening the keys 3, the number of which is equal to the number of monitored channels. In this case, the signals from the unifying converters 1 are connected in turn to the input of the comparison unit 6. If the difference module between the signal and the setpoint exceeds the permissible deviation, which indicates a channel failure, then the output of block 6 is a signal arriving at block 8 of the display. At the address inputs of block 8, there is a single position code of the address of the channel monitored at a given cycle, coming from the address outputs of switch 2. A corresponding indication element is displayed indicating that the channel is faulty. If it turns out that the modulus of the difference between the signal and the set point does not exceed the permissible level, then the comparison unit 6 does not work and the signal at the output of block 6, indicating a channel failure, does not appear. In order to avoid false positives of the comparison block 6 due to unsteady transients when the next channel is connected, the output of this block is gated with the multiplexer signal 22. The signals from the output of the comparison block 6 are also fed to the input of the counter 10, which records the number of failed channels, the counter outputs 10 controlling the state of the decoder 11, which is connected by its outputs to the inputs of the register 12, which is a set of flip-flops 13. Signals 1 appear on the first, second, and third buttons;) dah of the decoder 11 when 10 numbers appear in the counter, respectively, 1/3 K, 1/2 K and 2/3 K, where K is the number of failed channels, at which the control object is considered as inoperable. If, after monitoring all channels, the number of failures is less than 1/3 K, then during the monitoring cycle, signal 1 does not appear on any of the outputs of the decoder 11 and register 12 by the end of the cycle remains in the zero state. At the same time, at the zero output of its first discharge, 1 will remain through element 18 and arrive at the input of the addition control of the reversible counter 15 element 18 is open, since at the output of the element AND-NOT 21 there is a signal 1 due to the zero state of the outputs of the reverse counter 15 At the control input by subtracting the reversible counter 15, the signal O is because the element AND 17 connected to this input is closed with a zero signal from the single output of the second bit of register 12 and a zero signal from the output of the element OR 19, which is due to zero Niemi hundred down counter 15. The latter is provided in order to prevent mode -reversivnogo scheichika subtractor 15 if he hodits in a zero state. After the control cycle ends, the pulse appearing at the first additional output of the decoder 5 will switch the reversible counter 15 to a state one greater than the previous (zero) state, and multiplexer 22 connects to its output the next output splitter 23 with a pulse frequency of 2 two times smaller than predicate. After that, the pulse at the second additional output of the decoder 5 sets the counter 10 and register 12 to the zero state and starts the next cycle of polling the channels, which is performed at a rate two times lower than in the previous cycle. In the new cycle, the previously released channels confirm their status in display unit 8 and their number is summed up with the number of failures in the counter 10. If the total Number of failures by the end of the new cycle does not exceed 1/3 K, then the content of the reversible counter 15 will increase by one more unit as described, and the frequency of the pulses entering switch 2 will again be halved. This continues until either the number in the interval 1/3 K is written to the end of the next cycle in the counter 10; 1/2 K or multiplexer 22 It does not connect the last output of the splitter 23 with the minimum switching frequency for the proposed device to its code. In the first case, by the end of the cycle, the first bit of register 12 will go into one state and through element 18 will turn off the addition mode of the reversible counter 15, at the input of which the subtraction control also has signal O, since the second register bit has not yet worked. Therefore, the reversible counter 15 does not change its last state, so that the switching frequency of the switch 2 in the next cycle will remain the same as in the previous cycle. In the second case, in the reversible counter 15, the maximum number equal to the number of outputs of divider 23 without one and corresponding to 1 in all bits will be written down. At the same time, the AND-NE 21 element is triggered by disconnecting the addition mode of the reversing counter 15 through the E 18 element, and later on the device continues to operate with the minimum frequency. If the number of failures 1/2 K - 2/3 K is fixed at the end of any monitoring cycle, the first and second bits of the register 12 will be triggered. At the same time, the addition mode will be turned off and the reversible counter subtraction mode 15 will be connected, and state will decrease by

unit, which will entail a doubling of the switching frequency of switch 2. This doubling in each subsequent cycle occurs until the reversing counter 15 reaches the zero state and the switching frequency is not maximum, after which the OR 19 element is triggered and prevents further subtraction from the reversible counter 15. Next, the device operates at the maximum switching frequency.

If at the end of the monitoring cycle the number recorded in the counter 10 turns out to be greater than 2/3 K, then all three bits of register 12 will work. In this case, signal 1 from the single output of the third bit will go to the element And 17, which with the arrival of the pulse from the second additional output of the switch 2 will open, and through the element OR 20 the reversible counter 15 will be reset to the zero state. In order to reliably reset, the zero signal from the zero output of the third bit of register 12 closes the AND 17 element, which controls the subtraction mode of the reversible counter 15. The device then runs at the maximum clock frequency, since at the end of each cycle the reversible counter 15 is reset.

If it is necessary to stop the monitoring, an impulse is sent to the bus from the operator's console.

In the proposed device in comparison with the known with limited

The permissible number of the contact key element of the switch won the time of trouble-free operation determined by the formula I i / 1, where i is the average switching frequency in the proposed device, f is the fixed switching frequency in the known, is equal to the maximum of the set of frequencies of the proposed device.

The statistical characteristics of the control object failures are such that, in the control process, n switching frequencies appear with the same probability p, i.e. . Then

 Z; , , 1m

where j {/ 2, since the possible frequencies are twice as different. With this in mind, we get

y4 ..

 i 2- (

For example, with 2.6, i.e. in this case, a nearly threefold increase in uptime is provided. This increase significantly depends on the ratio of a priori and real failure rates and increases with the growth of the latter. When the failure rate is real. the object is equal a priori, on the basis of which the maximum switching frequency is chosen, the uptime of the proposed device is equal to the uptime of the known.

Claims (1)

DEVICE FOR AUTOMATIC, MONITORING A MULTI-CHANNEL OBJECT, Containing unifying converters, inputs connected to the inputs of the device, and outputs - information inputs of the contact key elements of the switch connected by control inputs through the first decoder to the outputs of the ring counter, a comparison unit, the first input connected to the output of the settings block and the second input - with interconnected outputs of the contact key elements of the switch, an indication unit, the control inputs of which are connected They are connected with the address outputs of the first decoder, the information input is connected to the output of the comparison unit, and the reset input is connected to the first output of the control unit and the reset input of the ring counter, characterized in that, in order to increase the reliability of the device, a counter and a second decoder are introduced into it, a register, a third decoder, a reversible counter, a multiplexer and a frequency divider, the information input of the counter connected to the output of the comparison unit, the reset inputs of the counter and the register connected to the first additional output of the first about the decoder, the outputs of the counter are connected to the inputs of the second decoder, the outputs connected to the inputs of the register, the first, second, third and fourth outputs of which are connected respectively to the first, second, third and fourth inputs of the third decoder, the fifth input connected to the second additional output of the first decoder and the counting input of the reversible counter, the sixth input - to the first output of the control unit g and the control input of the frequency divider, and the seventh input to the outputs of the reversing counter and address inputs the multiplexer, the information inputs of which are connected to the outputs of the frequency divider connected by the information input to the second output of the control unit, the output of the multiplexer is connected to the information input of the ring counter and the gate input of the comparison unit, while the first, second and third outputs of the third decoder are connected respectively to the summation control inputs , control subtraction and reset the reversing counter.