JPH02270063A - Advice device for evaluation of equipment - Google Patents

Abstract

PURPOSE:To improve the control efficiency of equipments and to set a proper changing time of a maintenance plan by obtaining the trouble frequency of an equipment for each prescribed item to display the qualitative analysis result of the trouble frequency with reception of the trouble data and at the same time calculating a trouble interval to display the result of evaluation. CONSTITUTION:Each of equipments 10 connected to the decentralized controllers 2-1 to 2-n contains a trouble detector 11 to detect the troubles of the equipment 10. Then the trouble data on the faulty equipment 10 and on each prescribed component item are given to a central controller 1. The controller 1 obtains the trouble frequency of the equipment for each prescribed item based on the trouble data and analyzes qualitatively the obtained trouble frequency to display the analysis result. At the same time, the trouble interval is calculated based on the qualitative analysis result of the obtained trouble frequency. Then the evaluation result of a pre- or post- maintenance is displayed for each prescribed item by reference to the parameter value obtained based on the trouble interval. Thus the control efficiency of equipments is improved in accordance with the actual situations. In addition, a plan can be changed to the preventive maintenance from the post-maintenance in the good timing in consideration of the state of deterioration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an equipment evaluation advice device that provides advice on equipment evaluation in real time.

[Conventional technology]

Various types of equipment are installed in facilities such as high-rise buildings, apartment complexes, hospitals, and factories. For example, such equipment includes air conditioning equipment, elevator equipment, lighting equipment, disaster prevention/crime prevention equipment, medical equipment, heat source plant equipment, transportation equipment, etc. These equipment include various equipment as equipment, various control devices, various sensors, etc. It has For example, air conditioning equipment includes many equipment such as refrigerators and heaters.

When a breakdown or abnormality occurs in these facilities, the equipment is repaired or replaced as appropriate, but some of the facility's functions are suspended until the repair or replacement is completed.

For this reason, a maintenance plan is usually created and equipment is regularly inspected based on this maintenance plan. This maintenance plan is established for each type of equipment using a cycle estimated from past experience or a cycle recommended by the manufacturer.

On the other hand, in various types of equipment, when the equipment is classified as a large category, the equipment group included in the equipment can be classified into medium items, and the medium items can further be classified into small items. For example, in the case of air conditioning equipment, the entire air conditioning equipment is a major item, the heat source equipment within the air conditioning equipment is a middle item, the refrigerator, etc. in the heat source equipment is a small item, and the refrigerator, etc. The internal components (compressor, condenser, bearing 7 casing, etc.) can be classified as further sub-items. When attempting to create a maintenance plan for such small items, these items are naturally ranked. In other words, the importance of inspection is determined, and corrective maintenance is performed for items that would not have a major impact even if they failed, and preventive maintenance is performed for items that would have a large impact if they failed. . Normally, these corrective maintenance and preventive maintenance are determined qualitatively based on on-site operational standards.

[Problem to be solved by the invention]

However, if a maintenance plan is created for each item in accordance with corrective maintenance and preventive maintenance that are qualitatively determined based on such operational standards, corrective maintenance may not be carried out even though there is a sign of failure based on the deterioration status of that item. However, it was not possible to change the plan from corrective maintenance to preventive maintenance in a timely manner, taking into account the state of deterioration.

Furthermore, when monitoring equipment in addition to maintenance planning, it is important to understand the tendency of failure occurrence for each item. However, grasping the trend of failure occurrence is generally performed by manually compiling the failure occurrence status, which is extremely troublesome and difficult work. For this reason, it is not always possible to grasp trends in failure occurrence, and it has not been possible to promote efficiency in equipment management in line with the actual situation.

[Means to solve the problem]

The present invention has been made to solve such problems, and it calculates the failure frequency of equipment for each predetermined item based on the provided failure data, and qualitatively analyzes the determined failure frequency. The results are displayed, and the obtained failure frequency is quantitatively analyzed, and the failure interval is calculated for each predetermined item based on the analysis result, and the parameter value determined based on the calculated failure interval is used as a reference to calculate the failure frequency for the predetermined item. This system evaluates whether preventive maintenance or corrective maintenance is required for each type of maintenance and displays the results.

[Effect]

Therefore, according to this invention, the failure frequency of equipment is determined for each predetermined item based on the provision of failure data, and
Qualitative analysis results of the failure frequency are displayed. Also,
After receiving the failure data, the failure frequency of the equipment is determined for each predetermined item, the failure interval is calculated based on the quantitative analysis result of the failure frequency, and the parameter value determined based on this failure interval is calculated. For reference, the evaluation results of whether preventive maintenance or corrective maintenance is performed for each predetermined item are displayed.

〔Example〕

Hereinafter, the equipment evaluation advice device according to the present invention will be explained in detail. FIG. 2 is a diagram showing a building monitoring and control system including an embodiment of this equipment evaluation and advice device.

This system monitors and controls various facilities such as the building's environment, hygiene, and disaster prevention, and includes a central control device 1 that comprehensively manages these facilities and equipment 10, and a It is provided with a plurality of distributed control devices 2-1 to 2-n connected to each of the equipment 7-1 to 7-n so as to control the plurality of equipment 10 as a group for each equipment. Here, the distributed control device 2-1 is connected, for example, to control the air conditioning equipment 7-1, and the air conditioning equipment 7-1 has heat source equipment as its middle item and equipment such as a refrigerator that is classified as a sub-item. It is composed of equipment 10.

The central control device 1 includes a keyboard 31 for operation, a CRT 4 for screen display, and a printer 5 for printing out the displayed contents. The CRT 4 and printer 5 are located in the central monitoring room. This central control device 1 processes and stores management data, manages and distributes system-shared data, and also processes distributed control devices 2-1 to 2-1.
Controls control and system processing spanning 2-n. It also has a function as an equipment evaluation advice device according to the present invention.

On the other hand, the distributed control devices 2-1 to 2-n are the facilities 7-1 to 7-
Performs alarm detection, power outage/recovery control, various energy saving controls, etc. Further, the equipment 10 connected to the distributed control devices 2-1 to 2-n is provided with a failure detector 11 that detects a failure of the equipment. Furthermore, each equipment 10 is also provided with a failure detector 11 for predetermined component items (not shown) (compressor, condenser, bearing, casing, etc.), and the equipment detected by the failure detector 11 is 10 and its failure data for each predetermined configuration item are stored in the distributed control device 2-1.
2-n and the transmission line 6 to the central control unit 1. Note that the failure detector 11 does not necessarily have to be provided for each equipment 10 and its predetermined configuration items, and can manually input failure data for each corresponding equipment 10 and its predetermined configuration items via the keyboard 3. It may also be given to the central control device 1.

Furthermore, provision of failure data via the failure detector 11 and provision of failure data via the keyboard 3 may be used together.

FIG. 3 is a flowchart showing the equipment evaluation advice operation by the central control device 1. Now, as an example, it is assumed that the refrigerator 10 in the air conditioner 7-1 is regarded as a piece of equipment and that advice is received from it.

That is, the central control device 1 stores failure data for each predetermined configuration item of the refrigerator 10 detected by the failure detector 11.
It is input via the transmission line 6 via the distributed control device 2-1 (step 201). The central control device 1 checks the number of failure occurrences (failure frequency) for each predetermined configuration item from the input failure data (step 202). Then, the order of failure frequency is examined for these predetermined configuration items, and a barrette diagram is created and displayed (step 203). That is, the failure frequency for each predetermined configuration item is qualitatively analyzed, and as a result of the analysis, a barrette diagram as shown in FIG. 1(a) is created and displayed on the CRTd. In this case, illustrated item A,
B, C, D and E are, for example, bearings of the refrigerator 10,
Compatible with compressors, casings, expansion valves and condensers.

On the other hand, in the subsequent step 204, the central control device 1 determines whether the number of times the failure has occurred is equal to or greater than a predetermined number N for each predetermined configuration item, and if it is less than or equal to N, the number of times the failure has occurred is A quantitative analysis is performed using the extreme value distribution, and a failure interval is calculated for each predetermined configuration item based on the analysis result (step 205). Further, if it is N or more, the number of failure occurrences is quantitatively analyzed using the Weibull distribution, and a failure interval is calculated for each predetermined configuration item based on the analysis result (step 206). In this embodiment, this step 20
5 and 206, the mean time between failures MT B F (Me
An Time Betileen Failure
) is calculated. And this calculated M
Based on the TBF, the necessity of modifying the inspection cycle for each predetermined configuration item is checked (step 207). The inspection cycle in this step 207 refers to the period T during which the MTBF reaches a predetermined reliability R, and the period T
By correcting the above, it becomes possible to conduct reasonable periodic inspections that do not cause excess or deficiency. Therefore, in step 207, it is checked for each predetermined configuration item whether or not the MTBF has changed from the previous MTBF.
If it is recognized that the TBF has changed, the inspection cycle is corrected for the configuration item for which the change has been recognized (step 208). This inspection cycle is displayed on the CRT 4 or printed on the printer 5 in response to a maintenance person's request.

Next, if the MTBF has been calculated by quantitative analysis using the Weibull distribution, the central controller 1 calculates the MTBF
Using the parameter value β found based on as a reference, its MT
An evaluation of whether preventive maintenance or corrective maintenance is performed is performed for each configuration item corresponding to the BF (step 209). That is, in general, the relationship between failure rate and usage period of equipment is shown by a bathtub curve as shown in FIG. Therefore, when the equipment is first introduced, the MTBF of the equipment is small, and as it is used, the MTBF increases and eventually reaches a stable period. As the life of the equipment approaches, the MTBF of the equipment gradually decreases. This means that the MT
This means the existence of an initial failure part TI where the BF increases, a stable failure period T2 where the MTBF thereafter becomes a constant value, and a life period T3 where the MTBF becomes smaller as the period of use becomes longer. . That is, in this embodiment, based on the MTBF calculated in step 206, if the MTBF tends to increase, β is set as 1 to indicate the initial failure part T1, and if the MTBF is constant, then β = 1. If the MTBF tends to decrease, β>I indicates the stable failure period T2, and the life 3tlIT3 is indicated as β>I. And β<1. If β = 1, “post-event maintenance” is sufficient for that component, and β〉
For only component 1, it is evaluated and determined that preventive maintenance j is necessary.The reason why it is not determined whether corrective maintenance or preventive maintenance is to be performed based on the MTBF calculated in step 205 is because of the extreme value distribution. This is because the calculation of the failure interval is based on an extremely small number of failure occurrences.
This is because a considerable error component is included in the judgment of the change tendency of the MTBF.

Then, in the subsequent step 210, the number of failure occurrences for each predetermined configuration item in step 202, the MTBF for each predetermined configuration item in steps 205 and 206, and step 2
The evaluation and judgment results for each predetermined configuration item in step 09 are displayed on the CRTd. Figure 1 (b) is an example of these displays on a CRTd, and the evaluation/judgment result of whether each predetermined configuration item is ``corrective maintenance'' or ``preventive maintenance J'' is displayed as a maintenance type that indicates the current operational status. Adjacent to column 4-1 is column 4-2 for recommended maintenance type.
will be displayed as . In addition, the MTBF and the number of failure occurrences for each predetermined configuration item are also displayed in the display column 4-3.
and 4-4. In addition to these data,
For example, a column 4-5 may be provided in which the time required for repair is displayed for each predetermined configuration item as MH/item.
The types of display data can be increased as necessary.

As can be seen from the above operations, if you wish to receive advice regarding the maintenance of the refrigerator 10 in the air conditioner 7-1, for example, you can freely access the central control device 1 by operating the keyboard 3, as shown in FIG. (
It is now possible to obtain display screens such as those shown in al and (bl), and with the barret diagram shown in FIG. The screen shown in Figure 1 (b) makes it possible to change the plan from corrective maintenance to preventive maintenance in a timely manner, taking into account the deterioration status of each predetermined configuration item.Moreover, in this case, the basic failure Since the data is given in real time, Figure 1 (a) and ('b)
The data obtained on the screen has extremely high accuracy and can promote efficient management of the refrigerator 10 in accordance with the actual situation.

In addition, on the display screen shown in Figure 1(b), the evaluation/determination result of whether it is "corrective maintenance" or "preventive maintenance" is shown as the recommended maintenance type. On the other hand, even if preventive maintenance is recommended, it is not enforceable and the decision to change the plan is left to the maintenance personnel. Furthermore, a histogram may be used instead of the barrette diagram shown in Fig. 1 [a], and the screen information shown in such barrette diagrams and histograms can be used to focus maintenance on items that have a high number of failures. Management becomes flexible.

Further, in this embodiment, the parameter value β determined based on MTBF is determined from the bathtub curve shown in FIG. 4, but this parameter value may be determined by other methods.

Furthermore, although the operation of the flowchart shown in FIG. 3 has been described as an example of receiving advice regarding the maintenance of the refrigerator 10, which is a small item, it may also be an example of receiving advice regarding heat source equipment, which is a medium item. Further, advice may be received regarding the air conditioning equipment 7 to 1, which is a major item, or advice may be received regarding the entire building including the equipment 7-1 to 7-n. In this sense, the concept of "r equipment" as used in the present invention is extremely broad.

〔Effect of the invention〕

As is clear from the above explanation, according to the equipment evaluation advice device according to the present invention, the failure frequency of the equipment is determined for each predetermined item based on the provision of failure data.
Since the qualitative analysis result of the failure frequency is displayed, it is possible to easily understand the failure occurrence tendency from the display contents of this qualitative analysis result, and it is possible to always understand the failure occurrence tendency. As a result, it will be possible to promote more efficient equipment management in line with the actual situation.

In addition, upon receiving the failure data, the failure frequency of the equipment is determined for each predetermined item, the failure interval is calculated based on the quantitative analysis results of the failure frequency, and the parameters are determined based on this failure interval. Since the evaluation results for preventive maintenance or corrective maintenance are displayed for each predetermined item using the values as a reference, it is possible to change the plan from corrective maintenance to preventive maintenance in a timely manner, taking into account the deterioration status of each predetermined item. .

[Brief explanation of drawings]

Figure 1 (a) is a barret diagram as a qualitative analysis result of the failure frequency displayed on the CRT shown in Figure 2;
b) is a diagram showing a display example of the evaluation/judgment result of whether preventive maintenance or corrective maintenance is displayed on the CRT shown in FIG. 2, and FIG. Figure 3 is a flowchart showing the equipment evaluation advice operation by the central control unit shown in Figure 2, and Figure 4 shows the relationship between the failure rate and usage period of equipment. It is a figure showing a bathtub curve. 1... Central control unit, 3... Keyboard, 4...
CRT, 4-1...Maintenance type display column, 4-2...
Recommended maintenance type display column, 7-1~? -n...Equipment, 1
0...Equipment equipment, 11...Failure detector.

Claims (1)

[Claims] A failure frequency calculation means that calculates the failure frequency of equipment for each predetermined item based on the provided failure data, and a qualitative analysis result that qualitatively analyzes the failure frequency determined by the failure frequency calculation means and displays the analysis result. a display means, a failure interval calculation means for quantitatively analyzing the failure frequency determined by the failure frequency calculation means and calculating a failure interval for each of the predetermined items based on the analysis result; An equipment evaluation advice device comprising an evaluation result display means for evaluating whether preventive maintenance or corrective maintenance is performed for each of the predetermined items and displaying the results by referring to parameter values determined based on failure intervals.