JPH02173809A - Trouble diagnosing device - Google Patents

Abstract

PURPOSE:To grasp both the area and the factor of a trouble by showing the trouble area estimated by an expert system based on a trouble deciding rule on a screen together with a flow chart of parts which are traced for estimation of the trouble area. CONSTITUTION:An expert system is applied for decision of the trouble area of an equipment to be controlled, and the trouble area is estimated based on a trouble deciding rule. A graphic data processing part 5 calls the graphic data corresponding to an abnormal area out of a graphic file 3. At the same time, the part 5 calls the flow chart data on the parts which are traced for estimation of the abnormal area out of the flow chart data on the trouble deciding rule. A display graphic data production part 6 produces the plant graphic data which displays the trouble area in a different form from other parts and the flow chart graphic data which displays the corresponding part in a different form from other parts and performs the graphic display. In such a way, both the area and the factor of a trouble is easily grasped.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention relates to an expert system for monitoring and fault diagnosis of plants as controlled objects, which is being introduced in a wide range of fields, such as electric power and general industries. In particular, the present invention relates to a failure diagnosis device that has the function of graphically illustrating failure locations in plants and control equipment made up of complex components.

(Prior Art) Generally, in expert systems for monitoring and diagnosing plants and various types of equipment, the graphical display is limited to a display screen in a limited state that is called up by an external procedure and displayed on a CRT display device.

Therefore, if a device that is basically displaying a still image and includes multiple I control units and tltI units is malfunctioning, other 83131
If you want to notify the operator using a different display, prepare a screen for each device that displays a different display than other devices when a failure occurs, and switch screens when the failure occurs on a different device. It was displaying a malfunction.

(Problem to be Solved by the Invention) However, such conventional failure diagnosis devices require a combination of an expert system construction tool for determining failures and a drawing tool for displaying failure locations in a display format different from other parts. The linkage is not sufficient, and the operator is given most of the information on the fault diagnosis results through diagnostic messages from the expert system construction tool, and the screen display that displays the faulty part is only given as supplementary information. This caused the following problems.

In other words, when displaying the failure diagnosis results as described above, it is difficult for the operator to intuitively understand the diagnosis results, and especially for inexperienced operators, it is difficult to correctly understand the situation unless the failure location is specifically shown. Furthermore, even experienced operators have a problem in that they are unable to quickly grasp the failure situation in the event of a failure that requires emergency treatment.

This invention was made in view of such conventional problems, and it not only clearly displays on the screen the fault location estimated by the expert system based on the fault judgment rule, but also estimates the location of the dead Pi@ among the fault judgment rules. To provide a fault diagnosis device in which a flowchart of the part traced for a fault is clearly displayed on the screen, and an operator can intuitively grasp the fault location and fault cause by looking at the display screen. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) The failure diagnosis device of the present invention includes a knowledge base that stores failure judgment rule data, graphic data of each part of a controlled object, and flowchart data of the failure judgment rule. a graphic file to be controlled, a means for inputting state data of a controlled object,
an inference means for estimating a failure location of the controlled object from the failure judgment rule data of the knowledge base and state data of the controlled object inputted via the input means; and a failure location of the 1IIJlj object estimated by this inference means. The graphic data of the part is called from the graphic file, the display format data different from other parts is given to the failure location, and the inference means of the failure judgment rule data stored in the knowledge base is failure. 70-chart data including the part traced for estimating the location is called from the graphic file, and the part traced for estimating the failure location is given display format data that is different from other parts and is output. A processing means, a display figure data creation means for creating display figure data based on the display format data from the figure data processing means, and a figure display means for displaying figures based on the display figure data from the display figure data creation means. It is equipped with the following.

(Operation) In the fault diagnosis device of the present invention, the fault location of the controlled object is estimated by the inference means from the knowledge-based fault judgment rule data and the state data of the controlled object. Then, regarding the fault location estimated by this inference means, the graphic data of the part including the fault location is read from the graphics file, and the display format data for displaying the fault location in a different display format from other parts is generated. At the same time, the inference means calls from the graphic file the flowchart data that includes the part traced to estimate the failure location in the failure judgment rule data, and reads other parts of the part traced to estimate the failure location. Assign display format data different from .

Next, based on these display format data, the display graphic data creation means sends a message to the display means. iIl! ! i location is displayed in a format different from other parts, and the 70-chart of failure judgment rule data is also displayed in a format that allows the part traced to estimate the failure location to be distinguished from other parts, By looking at the display screen of the display means, the operator can identify the location of the failure and also immediately read the cause of the failure from the screen display.

(Example) Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment of the present invention.
This failure diagnosis device includes a plant data input section 1 that inputs various status data from a plant as a controlled object;
A knowledge base 2 that stores failure judgment rule data for fault judgment of each part of the plant to be controlled by IL, and a failure judgment rule that stores graphical data of each part of the plant to be controlled by IL, and is stored in the knowledge base 2 at the same time. It also includes a graphic file 3 for storing data flowchart data.

Further, the fault diagnosis device estimates the fault location based on the fault judgment rule data stored in the knowledge base 2 and the status data of each part of the plant from the plant data input unit 1, and also configures the system. A control/inference unit 4 controls the operation of each part of the system, and the graphic data including the fault location estimated by the control/inference unit 4 is called from the graphics file 3, and the fault location is displayed in a different format from other parts. In order to display it, a display format data that is different from other parts is given to the faulty part, and at the same time
II. The inference unit 4 calls the flowchart data of the part traced for estimating the failure location from the graphic file 3 out of the failure judgment rule data of the knowledge base 2, and reads the flowchart data of the part traced for estimating the failure location. A display figure that includes a figure data processing unit 5 that provides display format data to be displayed in a display format different from that of other parts, and further creates display figure data based on the figure data processed by the figure data processing unit 5. It is equipped with a data creation section 6 and a CR7 display device 7 that displays a flowchart followed for displaying plant failure locations and fault estimation based on the display graphic data from the display graphic data creation section 6.

The operation of the failure diagnosis device having the above configuration will be described next.

When a failure occurs in the plant to be controlled, the control/inference unit 4 first reads the plant data α from the plant data input unit 1 (step S1), and then inputs the threshold (β) as shown in the flowchart of FIG. Step S
2) A rule corresponding to the plant data α is selected from among the failure diagnosis rules stored in the knowledge base 2, and the failure location is estimated based on the diagnosis rule (step 83).

In step S3, if the plant data α is larger than the threshold value β, it is determined that there is no abnormality according to the diagnosis rule, and the failure diagnosis based on the diagnosis rule ends. However, if the fault location γ is identified based on the diagnostic rule, a subroutine for securing graphic data is called (step S4).

By calling this subroutine, the graphic data processing section 5
Step S5) calls the graphic data corresponding to the abnormal location γ from the graphic file 3, and at the same time calls the flowchart data of the trace c part in order to estimate the abnormal location γ from the 70-diameter data of the failure diagnosis rule.
Provide display format data that makes the display format for the abnormal location γ different from other parts (step S6);
The control/inference unit 4 controls the graphic data processed in this way.
The data is given to the display graphic data creation section 6 via.

Based on the graphic data provided from the graphic data processing unit 5, the display graphic data creation unit 6 generates plant graphic data that displays the fault location γ in a format different from other parts, and the plant graphic data that is traced to estimate the fault location γ. Flowchart graphic data for displaying the corresponding part in the flowchart of the failure judgment rule in a format different from other parts is created, and the CR7 display device 7 is caused to display the graphic based on this data (step 87).

With this operation, the CRT display device 7 displays graphical data of the iil+ target plant as shown in FIG. 3 and flowchart data of the fault diagnosis rule as shown in FIG.
performs a graphical display as shown in FIG.

In other words, the screen of the CRT display device d7 is made into a multi-window format, and one screen 7a displays the system diagram of the plant equipment, and the failure location is highlighted by flickering, brightly shining, thick lines, etc. At the same time, on the other screen 7b, a flowchart 7b followed for estimating the failure location among the failure judgment rules is displayed.
The part traced to estimate the failure location is surrounded by a thick line that is different from other parts, or is painted out, or displayed in other display formats so that it can be read quickly.

To further explain this failure judgment rule, in the plant shown in FIG. 12, a discharge pressure detector 13, and a suction pressure detector 14. Hot water heated by a hot water generator 9 is sent to the process 8 by a water pump 11.

Here, if the process 8 side detects an abnormal state such as insufficient heat supply, the fault diagnosis device of the embodiment shown in FIG.
Status data is taken in from each detection 1512, 13, and 14 provided on the knowledge base 2, and a failure judgment is made based on the failure judgment rule data stored in the knowledge base 2.

Therefore, as shown in the flowchart of FIG. 4, if an abnormality due to insufficient heat supply occurs in the process 8 (step 811), the temperature data from the humidity detector 12 is first compared with the threshold value (step 512). Depending on whether the temperature is higher or lower than the threshold value, the water temperature is too low (step 513), a branch that determines the failure of other equipment, and the inference rule advances to the No side.

The temperature of the hot water flowing through the pipe 10 is sufficiently high, and step 81
If the branch is to the No side in step 2, then the discharge pressure data from the discharge pressure detector 13 and the suction pressure detector are used to determine whether the difference between the discharge pressure and the suction pressure of the pump 11 is higher than the threshold value. 14), and if it is determined that a sufficient discharge pressure has not been obtained, the branch is branched to the YES side and it is determined that a failure has occurred in the water pump 11. Determine (step S15)
.

However, if sufficient discharge pressure is obtained and the discharge pressure - suction pressure is greater than the threshold, it is branched to the No side, and it is determined that the amount of water supplied from the hot water generator 9 to the piping 10 is insufficient. (Step 816).

In this example of the failure determination rule, the water pump 11
If a failure has occurred in the water pump 11, it is determined that there is a failure in the water pump 11 based on the failure judgment rule shown in FIG. 4, and one screen 7a of the CRT display device 17 is In addition to the plant diagram, the fact that a failure has occurred in the part of the pump 11 is displayed using a thick line different from other parts, a flicker display, or other identification display, and at the same time, a flowchart of failure judgment rules is displayed on the other screen 7b. At the same time, the decision route for displaying the decision route that led to the failure of the water pump 11 is clearly indicated by using a thick line or filling different from the other '' parts, or by using a flicker display or the like.

In this way, when an abnormality occurs in the plant to be controlled, an if-if theory of the failure location is performed based on the failure judgment rule,
When a fault location is discovered, the plant diagram is displayed to clearly indicate the fault location in a format different from other parts, and the judgment route of the flowchart of the diagnostic rule followed to infer the fault location is also displayed. By simultaneously displaying a flowchart in a different format on the screen, the operator can quickly determine the location of the failure and understand the cause of the failure.

Note that the present invention is not limited to the above-mentioned embodiments, but as shown in FIG. 6, the function can be used at the time of rule depacking, and the function of Loop sieve step 88 that applies the graphic representation to all rules
- Depack all the failure judgment rules by adding S10, find out where the abnormality can be determined and where it cannot be determined from the contents displayed on the CR7 display device 7, and know where the failure judgment function is lacking. You will be able to do this.

[Effects of the Invention] As described above, according to the present invention, an expert system is used to determine the failure location of a device to be controlled, the failure location is estimated based on the failure determination rule, and the failure location is compared with other parts. At the same time, the route taken to determine the failure location in the flowchart diagram of the failure determination rule is also displayed in a format that can be distinguished from other parts. In such a case, the operator can easily understand the location and cause of the failure by looking at the display on the display means, and can quickly respond to the occurrence of the abnormality.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a flowchart showing the operation of the above embodiment, Fig. 3 is a system diagram showing an example of a controlled plant used in the above embodiment, and Fig. 4 is a FIG. 3 is a flowchart showing an example of a failure determination rule in a plant; FIG. 5 is an explanatory diagram showing an example of displaying a failure location in the above embodiment; FIG. 6 is an operation when performing rule depacking in the above embodiment. It is a flow chart explaining. 1... Plant data input section 2... Knowledge base 3... Graphic file 4.
...Control/inference section 5...Graphic data processing section 6.
...Display graphic data creation section 7...CRT display device

Claims (1)

[Claims] a knowledge base that stores failure judgment rule data; a graphic file that stores graphic data of each part of the controlled object and flowchart data of the failure judgment rule; input means for state data of the controlled object; and a failure judgment rule of the knowledge base. an inference means for estimating a fault location of the controlled object from the data and state data of the controlled object inputted via the input means; It calls from a file and assigns display format data different from other parts to the fault location, and the inference means traces the fault judgment rule data stored in the knowledge base to estimate the fault location. graphic data processing means that reads flowchart data including a portion traced from the graphic file, and outputs the portion traced to estimate the failure location by adding display format data different from other portions;
It comprises a display figure data creation means for creating display figure data based on the display format data from the figure data processing means, and a figure display means for displaying figures based on the display figure data from the display figure data creation means. Fault diagnosis device.