JPS63103307A - Trouble detector for controller - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) Does the present invention provide a ratio between actual measured values and reference values? This invention relates to a failure detection device that detects a failure of a control device that performs feedback of control versus nine devices based on the results of No. 2 and III control.

(Prior art) In general, control vs. ↑13 devices? In case of JlI,
The reference value is set externally, and the control pair and the controlled object of the 16' mirror are detected by the detector. 2. Description of the Related Art Many control devices are used that perform feedback control of a control pair or equipment based on a comparison result between a single value and the above-mentioned reference value.

FIG. 7 shows one week of the configuration of this type of conventional feedback control device. In FIG. 7, from the outside of the control device 23, base 1! = 1 shift 1 is given, this control device 23 controls the Ruri control χ・1℃ equipment's controlled 2Ilff
A deviation signal 3 between the actual mal 11'i2 from the detector 9 that detects i and the reference (iil 1) is obtained, and this /'2 difference signal 3 is further input to a transfer function block 4 consisting of an integral element and an advance element. and its output signal: tllll t)
'I signal 5 is given to the controlled device 21. and,
By changing this control signal 5, the operating state changes, and the actual measured value 2 also changes, so-called backfilling to the fee 1 is performed, and finally the actual measured value 2
When the deviation signal 3 matches the reference value 1, the deviation signal 3 becomes zero and becomes stable.

FIG. 8 shows an example of a control response in such a feedback control device. In Figure 8, time al
l 1% in l j 1! tm! 1, the actual measurement value 2 follows with a response delay specific to the feedback system. Next, it is assumed that this control unit 23 has some kind of failure at time t2 and the control becomes abnormal. - Clause 9 states that in the case of a failure of such a control device, the failure detection device of the controlled Bi device 21 itself indicates that the operating state has exceeded the protection level 6.7 of the n device (A in the figure). It is often detected by (8 in the figure) and protected. Note that since this failure detection device is not related to the present invention, illustrations and explanations thereof are omitted here.

However, the conventional feedback-based TM device as described above has the following problems. In other words, the control 3118123 has failed and the operating state has changed! 3junihani 1
Even if a difference occurs, if it falls within the protection level of the 1IIjIJ11 target device 21, it will not be considered a failure and will be left as is. This is a state in which there is no problem with the operation of the controlled device 21 itself, but if the device is incorporated into a part of the overall system and continues or repeats long-term operation unattended, the above-mentioned A failure of a device can place an unexpected burden on other devices in the system over a long period of time, and in some cases can lead to a major accident.

(Problems to be Solved by the Invention) As described above, in the conventional control 2'll design, even if a failure occurs in the control device itself, a protective operation is performed as long as the abnormal condition does not reach the protection level. Because of this, there was a problem in that abnormal driving could not be corrected promptly, leading to a major accident.

The present invention has been made to solve the above-mentioned problems, and its purpose is to quickly detect abnormal operation due to failure of the control device, thereby preventing it from leading to a major accident. An object of the present invention is to provide a failure detection device for a control device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides the real lI! ll1
Feedback control of the control device based on the comparison result between a and a reference value given from the outside: Control to perform 20! In the Il device, the fruit from the above detector,! I
IIll? a comparator that compares I with the reference value and sends an output signal when the comparison R exceeds a certain value;
It operates on the condition that the output signal sent from this comparator is input, and that this signal has been continuously input for a predetermined period of time necessary for fault determination of the control device, and the operation signal is transmitted to the control device. It is characterized in that it is constructed from a time-limiting element that is sent out as a detection signal.

(Function) Also in the above-mentioned failure detection device for a control device, the actual measured value from the detector for detecting the control gap of the control device and the reference value are compared by the comparator, and the comparison gap is constant. When the value is exceeded, an output signal is sent from the comparator. When the output signal from this comparator is continuously input to the time limit element for a predetermined period of time necessary for determining the failure of the control device, this is detected and the time limit element operates, and the operation signal is sent to the control device. This will be sent out as a failure detection signal.

(Example) First, FIG. 1 shows in block form an example of the basic configuration of a failure detection device for a control device according to the present invention, and the same parts as in FIG. This will be omitted and only the different parts will be described here.

That is, in FIG. 1, the actual measurement (direct 2
and the above criterion 1i)! A comparator 10 that compares the 1 and 1 and sends out an output signal @14 when the comparison exceeds a certain value, and an output signal 14 sent from the comparator 10 as input,
It operates on the condition that it is detected that this signal 14 has been continuously input for a predetermined time (TD) necessary for failure determination of the control device 23, and the operation signal is transmitted to the failure detection signal 15.
From the time-limited element 11 which is sent as
4.

Next, the operation of the control unit failure detection device constructed as described above will be described with reference to FIG.

Now, while the control device 23 is operating normally, some kind of failure occurs in the control device 23 at time t2, and as a result, the actual measurement m2 from the detector 9 and the reference 1i1
Suppose that there is a considerable deviation from 1i. At this time, the comparator 10 uses the actual measurement value 2 and the reference f! i1 is compared, and when the actual measurement value 2 by the detector 9 exceeds a certain range 13 compared to the reference 1111, the output signal 1 is output from C) in the figure.
4 is sent. When the output signal 14 from the comparator 10 is continuously input to the time limit element 11 beyond the operating time (TO in the figure) of the time limit element 11,
The time limit element 11 operates and its operation signal is controlled t3 equipment 23
It is sent out as a failure detection signal 15. Furthermore, by sending out this failure detection signal 15, it is detected that the control device 23 has failed, and the operation of the controlled equipment 21 is stopped, and this failure is communicated to the entire system to take necessary stopping measures. .

Next, a specific embodiment of the failure detection device d for a control device according to the present invention will be described with reference to the drawings.

FIG. 3 shows a (j+1 configuration example) when the fault detection device according to the present invention is applied to a control device that performs feedback control of direct current using a thyristor rectifier, and the same parts as in FIG. (The explanation will be omitted and only the different parts will be described here)! Vero. That is, in FIG. 3, 16 is the control 0 from the control 'a device 23.
■ A Cyrisk rectifier as a control device that supplies DC current to the negative iQ L in accordance with the Cyrisk control gate signal 5, which is a signal, and 17 a DC current detector that supplies DC current to the load. It shows.

An example of the response of the control device and the operation of the failure detection device in such a configuration will be described with reference to FIG.

Now, referring to Chapter 1, assume that the DC current is feedback-controlled by the si-risk control gate signal 5 from the υ control device 23.

In this state, if the reference l1111 changes at time 1, the ill tit device 23 changes the reference value 1.
The control device 2 outputs a gate signal 5 for controlling the thyristor corresponding to the deviation signal 3 between the measured value 2 and the actual value 2.
3 with a specific response delay. During this delay, the ratio I2 between the reference l1i11 and the actual measurement value 2 in the comparator 10 exceeds a certain range 13. For this reason,
The comparator 10 delivers an output signal 14 while the time-limiting element 11
By setting the operation time (TD) longer than the delay time of this response, the time-limiting element 11 does not operate and the failure detection signal 15 is not sent out.

Next, suppose that some kind of failure occurs in the control device 23 at time t2, and as a result, the actual measurement from the DC current detector 9 (direction 2) has a considerable deviation from the reference value 1. In such a case, conventional In contrast, when the DC current value at the actual measurement value 2 does not exceed the overcurrent protection level of the thyristor rectifier 16, an abnormality cannot be detected and the operation has to continue for a period of time. In this embodiment, we want the deviation between the actual measurement value 2 from the DC current detector 9 and the reference value 1 to exceed a certain range 13 (C in the figure), so that the output signal 14 from the comparator 10 is
was sent out, and the state of sending the output signal 14 from the comparator 10 continued longer than the operating time of the time limit element 11 (TD in the figure), so it was determined that this was not a normal response delay but a failure. Then, the time limit element 11 operates and an operating signal is sent out as a failure detection signal 15 to the control device 23.

Then, by sending out this failure detection signal 15, control 2!
It will be detected that the device 23 has failed, the operation of the thyristor rectifier 16 will be stopped, and an external protection signal will be sent.

As described above, in this embodiment, the comparator 10 and the limit lF! By applying the fault detection device 24 consisting of a simple configuration of the j element 11,
It is possible to quickly detect a failure in the control device 23, which could not be detected in the past, and to stop the operation of the SIRISK rectifier 16 itself.

In addition, by being able to quickly detect failures in the i and II control devices 23, it becomes possible to take necessary measures such as sending protection interlocking signals and warnings to the outside including the entire system, which can lead to serious accidents. It is possible to prevent this from happening.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be similarly implemented in the following manner.

That is, in the above embodiment, the present invention is applied to a control device that feedback-regulates a direct current using a thyristor rectifier, but the present invention is not limited to this, and can be applied to all feedback control devices having the above-described configuration. , which can be applied. For example, it can be applied to the same bottle when controlling the voltage of the thyristor rectifier 16 as shown in FIG. 5, or when controlling the rotation speed of the rotation U122 by υ as shown in FIG. be.

In addition, in FIG. 5, 19 is a voltage divider that detects the voltage of the thyristor rectifier 16, and in FIG. The speed controllers shown in FIG.

In addition, the present invention can be modified and hidden without changing the gist thereof.

[Effects of the Invention] As described above, according to the present invention, the actual measured value from the detector that detects the controlled variable of the controlled device to be feedback-controlled by the control device.

The output signal sent from the comparator when the comparison 8 with the reference side given from the outside exceeds a certain value is input, and this signal is the above-mentioned control! 2 (l) A time-limited element that operates on the condition that it has detected continuous input for a predetermined period of time necessary for fault determination of the device, and sends out the operating signal as a fault detection signal. So, 1ill tl
g. Y due to a failure in the equipment: A failure detection device for a control device can be provided that can quickly detect normal operation and prevent a major accident from occurring.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the basic configuration of a failure detection device for a control Xl device according to the present invention, FIG. 2 is a diagram for explaining the operation in FIG. 1, and FIG. 3 is a failure detection device for a control device according to the present invention. FIG. 4 is a block diagram showing an example of a practical example of a detection device; FIG. 4 is a diagram for explaining the operation of the same embodiment; FIGS. FIG. 7 is a block diagram showing a conventional feedback control device, and FIG. 8 is a diagram for explaining the operation in FIG. 7. 1... base field, 2... actual measured value, 3... 1 difference signal,
4... Transfer function block, 5... Control signal, 9...
・Detector, 10... Comparator, 11... Time limit element, 1
5... Failure detection signal, 16... Thyristor rectifier,
17... DC current detector, 19... Voltage divider, 20...
...Speed detector, 22...Rotating machine, 23...Control v
R times, 24... Failure detection device, 25... Speed controller. Applicant's agent Patent attorney Suzue Ni 〇Figure 2 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In a control device that performs feedback control of a device to be controlled based on a comparison result between a measured value from a detector that detects a controlled quantity of the device to be controlled and a reference value given from the outside, the actual measurement from the detector is performed. a comparator that compares a value with the reference value and sends out an output signal when the comparison amount exceeds a certain value; a time-limited element that operates on the condition that continuous input is detected for a predetermined period of time required for failure determination, and sends out the operation signal as a failure detection signal. Equipment failure detection device.