JPS5920004A - Automatic controller - Google Patents

Abstract

PURPOSE:To multiplex an amplifying part without degrading the reliability and increasing the power consumption, by adding signals from multiplexed amplifying parts and feeding back their outputs and comparing them with a correction signal to perform operations and correcting outputs of amplifying parts. CONSTITUTION:The correction signal from a controlling part 3 is received by an input resistance 11 and is compared with an operation signal, which is received by a feedback resistance 12, to a control object 6. After performing an operation, an operational amplifier 13 corrects a voltage/current converter 14 to reduce the difference between the operation signal and the correction signal. Outputs of converters 14 are added and are flowed to the control object 6 and are returned to a voltage signal by an earth resistance 15. Each amplifying part 5 receives the voltage signal as a feedback signal and repeats the similar operation. Consequently, when all systems are normal, plural systems take partial charge of outputting the output current, but the load current is kept constant, and the power consumption is the same as a single system as long as operations of amplifying parts 5 are well balanced.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to automatic control systems, and more particularly to multiplexed automatic control systems.

The technical background of the invention and the origin of its problems! In the IJb fliU control device,
The need for highly reliable first-year students is higher than before. One way to improve reliability is to manage the selection of parts used, but in recent years self- The demand for higher functionality in jJ control devices has led to an increase in the number of parts and a greater variety of products, and it is becoming increasingly difficult to obtain sufficient reliability through parts management alone. In such a situation, it is necessary to improve reliability by multiplexing (redundancy) the devices R, and multiplexing has been included in some areas in the past.

Generally automatic i1J! The I + sieve device l includes a detection unit that detects the state of the controlled object, an ftf control unit that compares and calculates the detected state quantity with a set target value, and outputs a correction signal to make them match, and an ftf control unit that outputs a correction signal. J! It is divided into an amplifier section that directly manipulates the controlled object by directing or converting it.
Conventionally, multiplexing has been performed only in the detection section and the control section.

The example in Figure 1 shows this, where the plant control target 6
The state, jlf'i, is detected by the multiplexed detectors 2, and each detector 2 sends the current state quantity as a signal to the corresponding multiplexed controller 3. The multiplexed control unit 3 compares the amount of disturbance in the state of the received signal with a set target value, and outputs a li'li positive signal to the downstream. The signal selection section 4 selects one appropriate value from the multiplexed outputs of the control section 3 according to a predetermined logic, and transmits this to the amplification section 5. The amplifying section 5 amplifies or converts the selected 1 mm positive sign, and! 1tll i'll] Operate object 6.

Therefore, when an abnormality occurs in the detection section 2 or the control section 3, the signal selection section 4 rejects the abnormal signal, thereby ensuring the integrity of the automatic control device 1. If an abnormality occurs in the amplifying section 5, normal operation of the automatic control device 1 is impossible.

On the other hand, in response to this, there have been a few attempts to somehow multiplex the amplification section 5. FIG. 2 shows an example of this, in which the multiplexed amplifier section 5 sends a signal to a signal switch 7, and the signal switch 7 selects a signal according to a predetermined logic. However, the reliability of this method largely depends on the reliability of the switching logic, and since the large current signal is switched after power amplification, there are problems with the 9-switcher 71' body. It's true.

Fig. 3 is also an example of the conventional multiplexing amplifier section 5, in which the output of the A section 5 is increased by 1'+'1' and the output of the A section 5 is connected to the low value selection diode 8 for the fault search. A low value selection circuit consisting of 9 selects the lowest value among them and outputs it.
Ru. Therefore, even if the increase/old output of -C1 (electric power) becomes abnormally high, a normal value will be output as the plant operation (i), and a healthy value will be maintained. However, in this method, since the force is supplied from the 111 lifting resistor 9 to both the low value selection diode 8 and the controlled object 6, approximately twice the normal force is consumed. This results in a problem of mounting space due to the heat-generating adhesive force.

Purpose of Investigation The present invention has been made in view of the above points, and is based on multiplexing of amplification sections, does not place the switching section 1 selection section, etc. in a large current area, and is a power-saving, highly reliable automatic system. Its purpose is to provide a control device.

This optical i-power is an automatic system with multiplexed amplifiers for amplifying or converting the correction signal of the state quantity of the controlled object, which is obtained by comparing the state quantity of the controlled object and the setting port OA value. In the control device, there is an addition section that adds the signals of the multiplexed amplification section forces S and others and outputs an operation signal to the controlled object, and an amplification section that feeds back the output of the addition section and compares it with the above correction signal. It is characterized by adding an operational amplification section for correcting the output.

Embodiment of the invention FIG. 4 shows an embodiment of the invention. In FIG. 4, the detection section 2 and the control section 3 are multiplexed as in the conventional example, and detailed explanation thereof will be omitted.

On the other hand, the amplifier section 5 is multiplexed, and its output is sent to the adder section 10.
are added to the operation signal to the controlled object 6 and fed back to each amplification section, and a comparison operation is performed on the correction signal from the upstream control section 3 to correct the output of the amplification section 5.

The details of one embodiment of the multiplexing amplification section mentioned above are explained in the fifth section.
As shown in the figure. In FIG. 5, the correction signal from the control unit 3 is received by the input resistor 11 and then compared with the operation signal to the controlled object 6 received by the feedback resistor 12. After performing the above calculation, the operational amplifier] 3 modifies the voltage/current converter 14 so as to reduce the difference between the operation signal and the correction signal. The output of the voltage/current converter 14 is summed with current, flows through the controlled object 6, and is connected to the ground resistor 15 by 'd
The positive pressure signal will be restored. Each amplifier section 5 receives the voltage signal as a feedback signal and repeats the same operation as described above.

Therefore, when all system valves are healthy, the output current is shared among multiple systems and output, but the load current is kept constant and each amplifier section 5 operates in a balanced manner. The power consumption is equivalent to that of a single system.

Next, let's consider circuit operation during abnormal conditions. For example, suppose that one system of operational amplifiers or voltage/current converters continues to output abnormally high signals. At this time, the remaining system detects the abnormally high current flowing through the grounding resistor as a feedback signal and operates to compensate for this, and eventually the output current returns to the value equivalent to the input to the amplifier section 5. do. Below, - system abnormality low or;
- Even in the case of a power outage, the abnormal value is compensated in the same way, and the output current can have a value equivalent to the input.

Furthermore, the present invention can also be applied to fault localization. FIG. 6 shows an example of a multiplexed automatic control device that performs fault localization. The signals from the multiplexed detection units 2) are multiplexed and sent to the tl+II control unit 3.
It is sent to the top 3 rows. Although not shown, each control unit 3 has a signal selection unit at the input point (for example, intermediate value selection logic), which selects one appropriate signal from a plurality of signals and sets it as the set target value. A comparison operation n is performed and a correction signal is output to each amplifier section 5. Each amplifier section has a configuration as shown in FIG. 5, and a plurality of input resistors 11 performs total averaging of input values, and outputs an operation signal to the pricking target 6 according to the input average value and a feedback signal of the operation output. do.

Although the adder 10 is shown to show its function, it is actually a current accumulator as shown in Figure 5, so the output side is only connected to the wire, and the feedback side is also just a single resistor, so there is no additional There are extremely few circuit elements.

In addition, if a failure occurs in one detection unit 3, in the conventional example, the entire system would become inoperable, but in this example, the signal at each level is Because it is distributed, a failure of an element will not affect downstream equipment. In other words, it can be seen that the failure localization has progressed further.

As described in detail of the invention, according to the present invention &C, conventional automatic! 1i
In IJ control equipment, we achieved multiplexing of amplifier sections, which was difficult to achieve, without deteriorating reliability, power consumption, etc., and combined with localization of failures, improved overall system reliability. is possible, and the improvement effect can be said to be significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional automatic control device.
? 4TJ2 and 413 are block diagrams showing an example of a conventional multiplexing amplification section, and FIG.
FIG. 5 is a block diagram showing an example of the multiplexing amplifier section of the present invention, and FIG. 6 is a block diagram showing a modification of the automatic control device of the present invention. 1...Automatic 1 interval 11114 Ut 2...Detection section 3"・1ftlJ f!11 section 4...Signal selection tXIK 5...Amplification section (j...) f+IJ fill target 7... No. 1g switching 'j; E 8...Low resistance selection diode 9.../il lifting resistance 10...Addition 7L section 11...Human resistance" 2...Feedback resistance" 3...Performance JE amplifier" 4... Heavy pressure/current converter j5... Earthing resistance (7317) Agent Attorney": Engineering 1υ Chikanori tU (Application) 1 person: Figure 1 Figure 2 Figure 31 ■

Claims (1)

[Claims] a detection unit that detects the state 1i of the controlled object, a control unit that compares and calculates the state quantity and the power setting target value and outputs a value that corrects the state quantity, and converts the correction signal. Automatic 1k consisting of an amplifier section that outputs operation signals to the controlled object
In the lJ quotient 1 device, the amplification sections are multiplexed and 1lf
Jkita) Is it controlled by adding the signals from the k-coded amplification section? +
11 On the adder unit that outputs the number in operation 1 to the target, the output of the adder unit is fed back and compared with the correction signal from the control unit,
An automatic) Uυ control device characterized in that an amplifying section and an operator j' for correcting the output of the amplifying section are added.