JPH06160130A - Failure cause diagnostic device for plant facility - Google Patents

Abstract

PURPOSE:To improve the preset diagnostic precision by accurately investigating the cause when a plant facility fails via the utilization of the data prior to the failure. CONSTITUTION:Whether failure data exist or not in the automatic monitor data signal outputted from a data signal input device 1 is judged by a signal processor 2. When there are no failure data from the judged result by the signal processor 2, the content of the first signal data memory device 3 storing the input data signal is stored as it is in the second signal data memory device 4. A failure cause diagnostic device is provided with a diagnostic processor 7 diagnosing the failure cause based on the logic regarding diagnostic items, the data immediately before the failure occurrence, the present data including the failure data read out from the first signal data memory device 3, and the observation data inputted from an observation data input device 5 when there are failure data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure cause diagnosing device for plant equipment, which is applied when a failure occurs in various plant equipment such as a pumping station and the cause of the failure is investigated.

[0002]

2. Description of the Related Art In recent years, in order to prevent accidents in various plant facilities or to support maintenance and maintenance work, fault diagnosis of plant facilities, especially investigation of the cause of faults, has become important. As a fault diagnostic device of this type,
For example, as disclosed in Japanese Patent Application Laid-Open No. 1-274209, there is a possibility that the machine may be damaged or the failure range may be expanded if a failure occurs, especially if the operation is continued as it is. In the event of a serious failure that needs to be stopped, the cause of the failure should be determined based on the observation data, which is input by the automatic monitoring data signal of the operation stopped state or manually by the failure occurrence. It was known to make such a diagnosis.

[0003]

However, according to the conventional fault-cause diagnosing device for plant equipment having the above-mentioned structure, the data signal input to the diagnostic processing device when a serious failure occurs causes the plant equipment to operate. Since the data signal in the state changes, there is a problem that a subtle error occurs in the result of investigating the cause of the failure and a highly accurate diagnostic result cannot be obtained.

The present invention has been made in view of the above circumstances, and achieves a significant improvement in diagnostic accuracy by effectively utilizing a data signal immediately before the occurrence of a failure, regardless of the severity of the failure. It is an object of the present invention to provide a failure cause diagnostic device for plant equipment.

[0005]

In order to achieve the above-mentioned object, a fault cause diagnostic device for plant equipment according to the present invention comprises:
A data signal input device for inputting an automatic monitoring data signal,
A signal processing device for inputting a data signal output from this data signal input device in a predetermined cycle to determine whether or not there is fault data in the data signal, and first signal data for storing the input data A second storage unit for storing the contents of the first signal data storage unit as they are when there is no failure data as a result of the determination by the storage unit and the signal processing unit.
Signal data storage device, a diagnostic logic storage device for storing logic relating to diagnostic items, an observation data input device for inputting various kinds of observation data, and failure data read from the second signal data storage device. Data immediately before the occurrence of a fault, logic related to a diagnostic item output from the diagnostic logic storage device, current data including fault data read from the first signal data storage device, and observation input from the observation data input device. A diagnostic processing device for diagnosing the cause of the failure based on the data.

[0006]

According to the present invention, in a signal processing device to which an automatic monitoring data signal is input in a predetermined cycle, it is always determined whether or not there is fault data in the automatic monitoring data signal. If it is determined from the result that the input data signal has failure data, the data immediately before the failure stored in the second signal data storage device is saved and stored as it is. Then, the data immediately before the occurrence of the failure, the logic related to the diagnostic item, the current data, and the observation data are input to the diagnostic processing device, and the cause of the failure is diagnosed based on them, that is, Since the diagnosis is performed based on the data at the time of the occurrence of a failure, the cause of the failure can be accurately investigated even when a serious failure occurs, such as forcibly stopping the operation of plant equipment. Such a highly accurate diagnosis is possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the structure of a failure cause diagnosis device for plant equipment according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a data signal input device, which is one of various data relating to the target plant equipment. , Always inputs an automatic monitoring data signal that can be automatically monitored using a sensor or the like in a predetermined cycle. A signal processing device 2 receives a data signal output from the data signal input device 1 in a predetermined cycle and determines whether or not there is fault data in the data signal. 3 is a first signal data storage device,
Store and update input data.

Reference numeral 4 denotes a second signal data storage device, which is stored in the first signal data storage device 3 when it is determined by the determination result of the signal processing device 2 that there is no failure data in the input data. The previously read data is read and the read data is stored. Reference numeral 5 is an interactive observation data input device, which is one of various data related to the target plant equipment that cannot be automatically monitored or is difficult, and data that human monitoring is desirable, such as pump vibration. Is large or small, data such as whether or not equipment such as a pump is overheated, and whether or not the lubricating oil is dirty are input through an input means such as a keyboard.
Reference numeral 6 is a diagnostic logic storage device, which stores logic relating to preset diagnostic items corresponding to the target plant equipment.

Reference numeral 7 is a diagnostic processor, which is the signal processor 2 described above.
When the result of the determination is that there is fault data, the data immediately before the fault is read from the second signal data storage device 4 and the logic relating to the diagnostic item output from the diagnostic logic storage device 6. , Based on the current data including the failure data read from the first signal data storage device 3 and the observation data input from the observation data input device 5, the diagnostic processing according to the logic is performed to detect the failure. It is to investigate the cause. A display device 8 is composed of a CRT and displays the result of the diagnosis by the diagnosis processing device 7.

Next, the operation of the fault cause diagnostic device for plant equipment having the above-mentioned configuration will be described with reference to the flow charts shown in FIGS. Among various data during operation of plant equipment, a data signal that can be automatically monitored is input to the signal processing device 2 through the data signal input device 1 in a predetermined cycle. In the signal processing device 2, as shown in FIG. 2, the input data is stored in the first signal data storage device 3 in accordance with the reading of the automatic monitoring data signal (step S10) (step S10).
11), it is determined whether or not there is failure data in the data signal (step S12), and when there is no failure data,
The input data is transferred and stored in the second signal data storage device 4 (step S13). That is, the current status of the plant equipment is stored and updated in a predetermined cycle.

On the other hand, if the result of determination in step S12 is that there is failure data in the input data, step S13 is not performed, and the process returns to step S10 and is repeated from the beginning.

Next, from the signal processing device 2 to the second
The current data including the data immediately before the occurrence of the failure, which is transferred and stored in the signal data storage device 4 side, and the failure data stored in the first signal data storage device 3 are input to the diagnostic processing device 7. At the same time, the logic relating to the diagnostic items output from the diagnostic logic storage device 6 is also input to the diagnostic processing device 7. And this diagnostic processing device 7
Then, as shown in FIG. 3, the data immediately before the failure and the current data are read (steps S20 and S21), the diagnostic logic is read (step S22), and further, if necessary, from the observation data input device 5. Along with the reading of the input observation data (step S23), a predetermined diagnosis process for investigating the cause of the failure is performed based on the respective data (step S24), and the result of the diagnosis is displayed on the screen of the display device 8. (Step S25).

As described above, when a failure occurs in any of the plant equipment, the data immediately before the occurrence of the failure is stored, and the cause of the failure is investigated based on the stored data. For example, even in the event of a serious failure that requires the operation of plant equipment to be stopped, it is possible to make a diagnosis based on the data at the time of the occurrence of the failure rather than the data at the time of the stop. Therefore, the cause of failure can be diagnosed with high accuracy.

In the above embodiment, only one data immediately before the occurrence of the failure is stored in the second signal data storage device 4, but a plurality of the second signal data storage devices 4 are installed. For example, not only immediately before the occurrence of a failure but also two or three times before, so that a plurality of data before the occurrence of the failure are stored and the cause of the failure is diagnosed based on the plurality of data. By doing so, it is possible to know the tendency of change over time leading to the occurrence of a failure, and it is possible to further improve the diagnostic accuracy.

[0015]

As described above, according to the present invention, when a failure occurs in the plant equipment, immediately before the occurrence of the failure, that is, when the plant equipment is in the operating state, Since a predetermined diagnosis is performed, even when a serious failure that stops the operation occurs, the cause of the failure can be accurately determined without using the data at the time of the operation stop, which changes compared with the time of operation. I can do it. Therefore,
It is possible to achieve a significant improvement in diagnostic accuracy regardless of the severity of the failure.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a failure cause diagnosis device for plant equipment according to an embodiment of the present invention. .

FIG. 2 is a flowchart illustrating an operation flow of the signal processing device in the operation of the above embodiment.

FIG. 3 is a flowchart illustrating an operation flow of the diagnostic processing device in the operations of the above embodiment.

[Explanation of symbols]

 1 data signal input device 2 signal processing device 3 first signal data storage device 4 second signal data storage device 5 observation data input device 6 diagnostic logic storage device 7 diagnostic processing device

Claims (1)

[Claims] 1. A data signal input device for inputting an automatic monitoring data signal, and a data signal output from this data signal input device in a predetermined cycle to determine whether or not there is failure data in the data signal. A signal processing device for determination, a first signal data storage device for storing input data, and when there is no failure data as a result of the determination by the signal processing device, the contents of the first signal data storage device are stored as they are. A second signal data storage device, a diagnostic logic storage device that stores logic relating to a diagnostic item, an observation data input device that inputs various observation data, and a second signal data storage device when there is failure data. The data to be read just before the occurrence of the failure, the logic relating to the diagnostic item output from the diagnostic logic storage device, the first signal data storage A cause of failure of plant equipment, comprising: a diagnostic processing device for diagnosing a cause of failure based on current data including failure data read from the device and observation data input from the observation data input device. Diagnostic device.