JPH02122336A - Controllability diagnostic device - Google Patents

Abstract

PURPOSE:To improve the reliability of a control arithmetic part by connecting a controllability diagnostic device in parallel to the control arithmetic part of a digital controller, calculating the state change of a device to be controlled in a simulated way based on the arithmetic result and the characteristics of the device to be controlled, and comparing the result of the simulated calculation with the characteristics of the device to be controlled for diagnosis of the controllability of the controller. CONSTITUTION:A learning means 20 works when a digital controller 1 is performing a normal control action, that is, the controller is used on line. A diagnostic means 30 inputs the arithmetic result into a characteristic formula of the characteristics 10 of a device to be controlled showing the learning result of the means 20 and calculates the state of the device to be controlled against the arithmetic result. Then the means 30 compares the result of its calculation with the state value of the characteristics 10 and also checks the control value to the arithmetic result to diagnose the controllability of the controller 1. A controller separating means 40 fixes the arithmetic result to a control arithmetic part 2 based on the arithmetic result obtained in the preceding arithmetic cycle and via the signal obtained when the diagnostic result of the means 30 has abnormality. The the arithmetic is stopped in the next arithmetic cycle. Thus the reliability of a control arithmetic part is improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a controllability diagnostic device that ensures the reliability of a digital control device using a digital computer such as an electronic computer or a microcomputer. .

(Conventional techniques 1%> Maintenance techniques for digital control equipment include self-diagnosis of hardware logic and abnormalities of the entire equipment (2) multiplexing, etc. On the other hand, maintenance techniques for control calculation units include process signals of There are limit value checks for input data from the human system that occur during adjustment tests and modification of digital control devices.

(Problem to be solved by the invention) Limit values for input data from the human system described above.
In this method, since the input data is a control calculation formula, the digital control device cannot know the expected value in advance, and therefore can only check the limit value for unreasonable data.

The present invention has been made in view of the above-mentioned situation C, and it is an object of the present invention to provide a controllability means device that can further improve the reliability of a control calculation unit by checking human-based input data with high precision. It is an object.

[Structure of the Invention] (Means for Solving Problems) In order to achieve the above object, the present invention provides a controllability diagnostic device for ensuring the reliability of a digital control device to which a digital computer is applied. a learning means for learning the characteristics of the controlled device from the calculation results of the rFIJ controller and the gross input signal of the digital control device; and learning means for learning the characteristics of the controlled device as a result of the learning and the control logic of the digital control device; A diagnostic means for diagnosing the calculation results, a control device disconnection means for disconnecting the digital control device from the control system when the diagnosed result is abnormal, and a display means for displaying the data and message of the diagnosed results. It was composed of

(Operation) First, a T, IJ Pp diagnosis device is connected in parallel to the control calculation section of the digital control device. ff1 (The control/1 diagnosis device has the relationship between the input of the control calculation unit and the calculation result as a wave interval 9! l device characteristic, and here it is the latest characteristic. Therefore, the calculation result and the controlled device characteristic The controllability is diagnosed by calculating the state change of the controlled device in a simulated manner and comparing the result with the characteristics of the controlled device 91.

(Example) Examples of real cotton will be explained below with reference to the drawings.

FIG. 1 is a diagram showing the relationship between a digital control device and a controllability diagnostic device according to the present invention, and is a diagram showing the relationship between a digital control device and a controllability diagnostic device according to the present invention.
1 rule 9! Controlled sex diagnosis for I calculation unit 2! ! lr device 3
are installed in parallel.

FIG. 2 is a diagram for explaining the functions of the controllability diagnostic device, and the controlled device characteristics 10 shown in FIG. This represents the relationship with the input signal I of the control calculation section 2 shown in FIG. And it is necessary to always approximate the characteristics of the latest controlled device. For that purpose, the learning means 20 in Figure 2
There is.

The diagnostic means 30 first performs a primary diagnosis on the calculation result O of the group control calculation section 2 shown in FIG. 1, and it is a reasonable value. : Diagnose. Next, as a secondary diagnosis, a state change of the controlled device is calculated based on the calculation result O and the controlled device characteristics 10 in FIG.
Compare with 0 and diagnose controllability. Diagnostic means 30 in FIG.
If an abnormality is recognized as a result of the diagnosis, that is, if there is a risk of major damage to the controlled device, the data and message to that effect are displayed on the data display means 50 in FIG.
At the same time as displaying or printing, the digital control device is disconnected from the control system by the control device disconnection means 40 shown in FIG. 2, and control is entrusted to another means. on the other hand,
If there is no abnormality in the control characteristics, the data display means 5 in Fig. 2
Diagnosis results are notified to the outside (that is, the human system) by displaying or printing data using 0.

Next, a method for realizing the learning means 20, the diagnosis means 30, and the control device separation means 40 shown in FIG. 2 will be explained.

The learning means 20 operates when the digital control device 1 shown in FIG. 1 is normally performing control operations, that is, when it is being used online.

The calculation result 0 is the result of the calculation by the control calculation unit 2 in FIG.
(equivalent to process output 0 outputted by the digital control device 1 to the controlled device in FIG. 1) The state quantity changed in the controlled device is calculated by the input signal I(
(Equivalent to the input signal I' of the digital control device 21 in FIG. 1)
The characteristics of the controlled device are calculated from these two signals O and ■. Based on the results, the characteristics of controlled device characteristics 1 in FIG. 2 are updated.

In short, the diagnostic means 30 is the above-mentioned ? ? Controlled device characteristics 1 as a result of learning the 4 calculation result 0 by the learning means 20
0 to calculate the state quantity of the controlled device 9p for the above-mentioned calculation result O, compare the result with the state quantity of the controlled device characteristic 10, and calculate the limit value for the above-mentioned calculation result O. The controllability of the digital control device 1 shown in FIG. 1 is diagnosed by checking.

The control device disconnection means 40 shown in FIG. 2 causes the control calculation section 2 to fix the calculation result at the calculation result in the previous calculation cycle in response to a signal when there is an abnormality in the diagnosis result of the diagnostic element F9.30. : and stops the calculation in the next calculation cycle. Therefore, this action causes the digital control device to stop.

Next, I will explain the overall effect.

As shown in FIG. 1, the input signals of the controllability diagnosis device 3 according to the present invention are the input signal I of the control calculation section 2 and the calculation result O. Here, the input signal (2) and the calculation result 0 are equivalent to the process input (2) and the process output O' of the digital control device 1. Therefore, the controlled house call l of FIG. 1 which is the present invention! IF
It is used for the input signal of the device 3. Note that the controllability diagnostic device 3 performs learning when it is not used as a diagnostic device.

The learning results are then used when making a diagnosis.

Further, the learning means 20 calculates the characteristics of the controlled device from the input signals (1) and O (7), and adjusts the controlled device characteristics 10 to the characteristics of the controlled device that change over time.

On the other hand, the diagnostic means 30 uses the controlled device characteristics 10 that are the learned results to calculate the R amount of the controlled device with respect to the input signal O, and calculates the state R amount of the controlled device with respect to the input signal O, which is shown in the controlled device characteristics 10 at that time. Diagnosis is made by comparing with the state R amount of the controlled device learned by the learning means 20.

Furthermore, the diagnostic means 30 displays or prints the results of the diagnosis as data and messages on the data display means 50, and at the same time, if there is an abnormality in the diagnostic results, the digital control device is disconnected from the control system and the control operation is performed. Control device disconnection means 4 to leave it to other means
Output for 0.

The above-described operation is a case where the digital control device is diagnosed by the controllability diagnostic device while it is being used online. As shown in FIG. 3, there is a case in which the controllability diagnosis apparatus of the present invention is used as a simulator having a diagnosis function.

〔Effect of the invention〕

As explained above, according to the present invention, by checking in detail the reliability maintenance of the control calculation section of a digital control device, or by using a simulator having a diagnostic function to perform a controllability diagnosis device prior to online use of the digital control device. By using it as a digital control device, it is possible to maintain reliability over the details of the digital control device.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between a digital control device and the controllability diagnosis device of the present invention, Fig. 2 is a diagram explaining the functions of the controllability diagnosis device of the present invention, and Fig. 3 is the present invention. FIG. 3 is a diagram showing the relationship between a digital control device and a controllability diagnostic device when the controllability diagnostic device is used as a simulator. 1... Digital control device 2... Control calculation section 4... Process input section 10... Controlled device characteristics 30... Diagnosis means 3... Controllability diagnostic device 5... Process output section 20...Learning means 40...f%IJ control device disconnection means 50...Data display means

Claims (1)

[Claims] In a controllability diagnostic device that ensures the reliability of a digital control device that applies a digital computer, learning that acquires the characteristics of a controlled device from the calculation results of control logic by the digital control device and the process input signal of the digital control device. means for diagnosing the characteristics of the controlled device as a result of said learning and the calculation results of the control logic of said digital control device; What is claimed is: 1. A controllability diagnostic device comprising: a control device disconnecting means for the control device; and a display means for displaying data and messages of the diagnostic results.