JPH07281736A - Facility diagnostic device - Google Patents

Abstract

PURPOSE:To find out the indication of severe abnormality and to grasp the degree of abnormality by measuring the operation time of a diagnostic object facility corresponding to an impressed test signal and deciding whether or not the operation time is settled within an allowable range set by plural stages. CONSTITUTION:A characteristic storage part 11 stores an operation time characteristic 12 of a diagnostic object facility 2 and an allowable class range 17 composed of lower limit and upper limit value characteristics. Then, operation time Tn of the diagnostic object facility 2 measured by the operation time measuring part 4 is temporarily stored in an operation time storage part 15 and corrected by a correcting part 18 corresponding to external conditions such as the temperature, and a severe abnormality deciding part 20 decides whether the corrected operation time is settled in the allowable class range corresponding to the test signal or not and decides the generation of severe abnormality when the operation time gets out of this allowable range. On the other hand, a light abnormality deciding part 19 read a peculiar allowable range corresponding to the test signal from a peculiar allowable range storage part 22, temporarily decides the generation of light abnormality when the corrected operation time gets out of this range, and transmits these decided results to an editing display control part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equipment diagnostic device for judging the normality / abnormality of equipment to be diagnosed by the operation time when a test signal is applied.

[0002]

2. Description of the Related Art For example, when an operation command signal is input from the outside into various equipment incorporated in plants of various factories, the operation is started, and the operation is stopped when the operation command state is entered. There is something. For example, in an electromagnetic valve installed in piping, when an operation command signal that directs the valve opening is applied, the valve starts opening and closing, and when the valve opening reaches the specified opening, the valve opens and closes. Stop the operation.

In such equipment, as a method for easily diagnosing whether or not the equipment normally operates, a predetermined reference test signal is applied to the device to be diagnosed, and the device in the device to be diagnosed There has been proposed an equipment diagnostic apparatus that measures an operation time for a reference test signal and determines that an abnormality has occurred when the measured operation time is out of a predetermined allowable range.

FIG. 3 is a schematic configuration diagram of an equipment diagnostic apparatus having the above-mentioned diagnostic function. In the characteristic storage unit 1, the reference signal level I _S to be applied to the equipment 2 to be diagnosed and the reference operation time T when the reference test signal A _S having this reference signal level I _S is applied to the apparatus 2 to be diagnosed. _S , an upper limit value T _SH and a lower limit value T _SL for the reference operation time T _S are stored.

The test signal output unit 3 reads the reference signal level I _S stored in the characteristic storage unit 1, creates a reference test signal A _S having this reference signal level I _S, and sends it to the equipment 2 to be diagnosed. Apply. Upon receiving the reference test signal A _S , the equipment 2 to be diagnosed starts operating in the direction indicated by the reference test signal A _S. When the reference test signal A _S reaches the specified state, the operation is stopped.

The operating time T ₀ in the equipment 2 to be diagnosed
Is measured by the operating time measuring unit 4. The measured operating time T ₀ is once stored and held in the operating time storage unit 5. The operation time determination unit 6 determines the operation time T ₀ stored in the operation time storage unit 5 and the upper limit value T stored in the characteristic storage unit 1.
It is compared with the _SH and the lower limit value T _SL, the operation time T ₀ consists of the upper limit value T _SH and the lower limit value T _SL reference tolerance (T _SL ~
When it is in the range of T _SH ), it is determined to be normal, and when it is out of the reference allowable range (T _{SL to} T _SH ), it is determined to be abnormal.

That is, when the measured operation time T ₀ is longer than the upper limit value T _SH , the state of the equipment is the reference signal level I.
If it is predicted that the state indicated by _S has gone too far or the operation does not converge, and the measured operation time T ₀ is less than the lower limit value T _SL , the state of the equipment has reached the state indicated by the reference signal level I _S. Not predicted. In this way, the normality / abnormality can be easily determined by measuring the operation time T ₀ of the equipment 2 to be diagnosed.

[0008]

However, the equipment diagnosis apparatus shown in FIG. 3 still has the following problems to be improved. That is, the reference permissible range (T _{SL to} T _SH ) serving as a judgment reference when the test signal A _S having the reference signal level I _S stored in the characteristic storage unit 1 is applied.
Is a value of one type determined by the type and specifications of the facility 1 to be diagnosed. And this value is based on the test result at the time of factory shipment after manufacturing this diagnostic target equipment 1. That is, it is the permissible range when the facility 1 to be diagnosed is operated independently. Moreover, this allowable range is a value empirically set by an engineer or a plant monitor.

Therefore, the allowable range is wide with a considerable margin compared to the fluctuation range of the actual operating time T ₀ that actually occurs when the plant is operating. as a result,
The abnormality is noticed when the abnormality of the equipment progresses considerably and the operating time T ₀ is out of the reference allowable range (T _{SL to} T _SH ). However, at this point there is concern that some serious abnormalities have occurred.

In order to eliminate such inconvenience, the reference permissible range may be set to be narrow, but if it is set to an excessively narrow range, abnormal information is frequently output even though it is not such a serious abnormality, and the target information is output each time. The equipment will be stopped and the equipment will be inspected.

The present invention has been made in view of the above circumstances, and has a wide type allowable range with some allowance based on experience and a slightly narrower specific allowable range that is closer to the actual one, thereby causing a serious abnormality. It is an object of the present invention to provide a facility diagnostic device capable of surely detecting the above-mentioned situation, discovering a symptom of the abnormality before it develops into a serious abnormality, and grasping the degree of the abnormality when the abnormality occurs.

[0012]

According to the present invention, a test signal is applied to equipment to be diagnosed, an operation time for the test signal in the equipment to be diagnosed is measured, and the measured operation time falls within an allowable range. Whether the equipment to be diagnosed is normal or not
It is applied to equipment diagnostic equipment that determines abnormalities.

In order to solve the above-mentioned problems, in the equipment diagnosing apparatus of the present invention, a type allowable range which is empirically determined in advance according to the operating time characteristics of the equipment to be diagnosed and the type of equipment to be diagnosed is set. A characteristic storage unit to store, a test signal output unit that creates a test signal based on the operating time characteristic stored in the characteristic storage unit and applies the test signal to the facility to be diagnosed,
An operation time measurement unit that measures the operation time of the equipment to be diagnosed that operates according to the test signal, a unique tolerance range storage unit that stores the unique tolerance range unique to the equipment to be diagnosed, and the operation time measured by the operation time measurement unit Is outside the peculiar tolerance range stored in the peculiar tolerance range storage part, a minor abnormality determination part that determines that it is a minor abnormality, and the type tolerance stored in the peculiar tolerance range storage part for the operation time measured by the operation time measurement part It is statistically unique from the severe abnormality determination part that determines a serious abnormality when out of the range and the multiple operation times measured by the operation time measurement part when the same test signal is applied to the diagnostic target equipment multiple times. And a peculiar permissible range calculation unit that calculates the permissible range and sets it in the peculiar permissible range storage unit.

Further, in the equipment diagnostic apparatus of the invention of claim 2, in addition to the above-mentioned respective parts, the operating time characteristics of the characteristic storage part are displayed in a two-dimensional graph, and the respective judgment results of the respective judgment parts and the respective permissible values. A diagnostic result display unit for displaying the range on the two-dimensional graph is provided.

[0015]

In the equipment diagnostic apparatus configured as described above, the allowable range of the operating time is the empirically determined type allowable range, which is empirically determined according to the type of the diagnosis target equipment stored in the characteristic storage unit. There are two allowable ranges, the unique allowable range stored in the allowable range storage unit. The inherent tolerance range is a tolerance range statistically determined from a plurality of actually measured operation times.

Generally, the type allowable range is set wide with some allowance, and the specific allowable range is set to a range slightly wider than the actual operating time fluctuation range when the equipment to be diagnosed is operated. There is.

Therefore, when the operation time obtained when the test signal is applied to the equipment to be diagnosed falls within the narrow specific tolerance range, it is judged as normal and the measured operation time exceeds the specific tolerance range. If it is less than the type allowable range, it can be judged to be a minor abnormality. Further, if the measured operation time is out of the type allowable range, it can be determined that a serious abnormality has occurred.

That is, by setting the allowable range for comparing the operation times in two stages, a serious abnormality can be reliably detected, and the degree of the abnormality that has occurred can be grasped to some extent.

Further, in the invention of claim 2, in the diagnostic result display section, the operating time characteristics of the characteristic storage section are displayed in a two-dimensional graph, and each judgment result and each of the above-mentioned allowable ranges are displayed on the two-dimensional graph. Is overlaid on. Therefore, the operator of this equipment diagnosis device can visually understand the diagnosis result, and the operability of this device can be greatly improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an equipment diagnostic apparatus of the embodiment. The same parts as those of the conventional equipment diagnostic device shown in FIG. 3 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions is omitted.

In the characteristic storage unit 11, the operating time characteristic 12, the lower limit value characteristic T _L and the upper limit value characteristic T _{H of the} facility 2 to be diagnosed are stored.
The type allowable range (T _{L to} T _H ) 17 composed of and is stored. The operating time characteristic 12 and the type permissible range (T _{NL to} T _NH ) 17 are written from the characteristic setting unit 16.

The characteristic setting unit 16 is composed of a man-machine device including a CRT display device and a keyboard, for example. The engineer refers to the design specifications or the result of an experiment conducted by the diagnostic target equipment 2 alone, and the test signal having the input signal level I and the corresponding input signal level in the diagnostic target equipment 2 as shown in FIG. Characteristic 1 showing the relationship with the operating time T of the relevant diagnostic target equipment 2 when applying
2 is created on the display screen of the characteristic setting unit 16 and written in the characteristic storage unit 11.

Further, the technician, based on experience, sets the lower limit characteristic T _L and the upper limit characteristic T _H for the set operating characteristic 12.
A type permissible range (T _{L to} T _H ) 17 is created and written in the characteristic storage unit 11.

The test signal output unit 13 reads out one signal level I _n (measurement point) of the input signal levels I in the operation time characteristic 12 stored in the characteristic storage unit 11, and outputs this signal level I _n . The test signal A _n is prepared and applied to the facility 2 to be diagnosed.

Further, the characteristic storage unit 11 has a type permissible range (T _{NL to} T _N ) consisting of a lower limit value T _NL and an upper limit value T _NH corresponding to the signal level I _n (measurement point) read by the test signal output unit 13. _(NH ) is sent to the serious abnormality determination unit 20 and the edit display control unit 23. The characteristic storage unit 11 also transmits the operation time characteristic 12 and the corresponding signal level I _n (measurement point) to the edit display control unit 23.

Upon receiving the test signal A _n , the equipment to be diagnosed 2 starts operating in the direction indicated by the test signal A _n . When the test signal A _n reaches the specified state, the operation is stopped.

The operating time T _n in the equipment 2 to be diagnosed
Is measured by the operating time measuring unit 4. The measured operating time T _n is once stored and held in the operating time storage unit 15. The operation time T _n stored in the operation time storage unit 15 is corrected by the next correction unit 18 according to external conditions such as temperature, humidity and atmospheric pressure. The operation time T _nx corrected by the correction unit 18 according to the external condition is the minor abnormality determination unit 19, the serious abnormality determination unit 20, the unique allowable range calculation unit 21, and the edit display control unit 23.
Sent to.

The serious abnormality determination unit 20 determines whether or not the input corrected operating time T _nx falls within the type allowable range (T _{NL to} T _NH ) corresponding to the test signal A _n . If the type is out of the allowable range (T _{NL to} T _NH ), it is determined that a serious abnormality has occurred. In the case of the serious abnormality determination, an alarm is output to the outside by a buzzer or the like, and the determination result of the presence or absence of abnormality is transmitted to the edit display control unit 23.

In the peculiar tolerance storage unit 22, each input signal level I _n (n = 1.2.3.4.n) statistically calculated in consideration of the fluctuation range of the actual operation time of the equipment 2 to be diagnosed.
Each specific tolerance for each _{...) (T nL ~T nH)} (n = 1.2.3.4.
...) is remembered.

The minor abnormality determining section 19 determines the relevant test signal A
_n , that is, the peculiar allowable range (T _{nL to} T _nH ) corresponding to the input signal level I _n (measurement level) is read from the peculiar allowable range storage unit 22. Then, the minor abnormality determination unit 19
It is determined whether or not the input corrected operation time T _nx falls within the read peculiar allowable range (T _{nL to} T _nH ). If an off-specific tolerance (T _nL ~T _nH), determines that the time being minor abnormality occurs. If entering the specific tolerance range (T _nL ~T _nH), it determined to be normal. The determination result is transmitted to the edit display control unit 23.

Next, the operation of calculating the unique allowable range in the unique allowable range calculator 21 will be described. In the initial state in which the device to be diagnosed 2 is newly installed in the plant, the plant is actually operated to perform various operation tests. In this operation test, the operation time characteristic 1 shown in FIG.
A plurality of input signal levels I _{n in 2} (n = 1.2.3.4 ....)
At the (measurement point), the same test signal A _n is applied to the diagnosis target device 2 over a plurality of times, about 10 times each, and the respective operating times T _n are measured.

Then, the maximum operating time T _n-max and the minimum operating time T _n-min at each input signal level I _n are searched for, and a fixed dead zone T _x (margin time) is added or subtracted to obtain a specific allowable range (T The lower limit value T _nL and the upper limit value T _nH of ( _{nL to} T _nH ) are calculated.

Lower limit value T _nL = T _n-min −T _x upper limit value T _nH = T _n-max + T _x n = 1.2.3.4 ... Each input signal level I _n (n = 1.2.
3.4 Each specific tolerance _{in. ...) (T nL ~T nH} ) is written into specific tolerance range storage unit 22.

Therefore, each peculiar allowable range (T _nL ~
T _nH ) is the operating time T actually measured by the operating time measuring unit 4 when the equipment 2 to be diagnosed is operating normally.
2 becomes the range in which a predetermined margin time is added to the fluctuation range of
As shown in, the range is considerably narrower than the type allowable range (T _{NL to} T _NH ).

Therefore, the input signal levels (measurement points) I _n described above are stored in the peculiar allowable range storage unit 22.
Each specific allowable range (T _NL ~ in (n = 1.2.3.4 ...))
T _NH ) (n = 1.2.3.4 ....) is stored.

As shown in FIG. 2, the edit display control unit 23 stores the operation characteristic 12, the lower limit value characteristic T _NL and the upper limit value characteristic T _NH which are input from the characteristic storage unit 11 in the CRT display device 24 as shown in FIG.
Display a dimension graph. Furthermore, the lower limit value T _NL and the upper limit value T _{NH of} the type permissible range corresponding to the input signal level I _n (measurement level) selected this time, the lower limit value T _nL and the upper limit value T _{nH of} the specific permissible range, which are measured this time. The operating time T _nx , the two-dimensional coordinate point P on the characteristic, and the current diagnosis result are displayed on the two-dimensional graph of the operating characteristic 12 in an overlapping manner.

That is, when the measured operating time T _nx falls within the peculiar allowable range (T _{nL to} T _nH ), it is judged as “normal” and displayed, and the operating time T _nx shows the peculiar allowable range (T _nL ~ T
When entering the _off-nH) and type tolerance _(NL through T _NH) in displays it is determined that [insignificant abnormal, if the operation time T _nx is out classification allowable range _(NL through T _NH) is Judge as [Serious] and display.

Not only one kind of input signal level I _n is selected as the test signal A _n and applied to the equipment 2 to be diagnosed, but also n = 1, 2, 3, ... each test signal to the _{point) I n A n (n =} 1,2,3,
...) is generated and applied to each input signal level (measurement point) I _n for each operation time T _nX.
Can be determined to be normal or abnormal.

According to the equipment diagnosing apparatus having such a configuration, the characteristic storage unit 11 has a large empirically determined in advance in accordance with the specification and type of the diagnosis object equipment 2 alone, that is, the diagnosis object equipment 2. a relatively wide type tolerance having a margin _(NL ~T _NH), relatively narrow specific tolerance that is statistically determined from actually measured plurality of operating time (T _nL through T
_nH ) and the operating time measured with two tolerances.

Therefore, when a "minor abnormality" is warned, it is not necessary to take a countermeasure immediately, but the fact that the abnormality has occurred is stored and a countermeasure is taken when the same abnormality occurs frequently. If a [Critical Abnormality] is warned, take immediate measures. In this way, by setting the allowable range for comparing the operation times in two stages, it is possible to reliably detect a serious abnormality and to grasp the degree of the abnormality that has occurred to some extent.

Further, regarding the type of abnormality, it is possible to judge [minor abnormality] as a sign of [serious abnormality] and eliminate the cause of abnormality early so as not to reach [serious abnormality]. .

In the embodiment, the operating time of the equipment is measured and the equipment-specific judgment time calculated by calculation is used together to perform equipment diagnosis. However, the equipment-specific process amount (current, temperature, For equipment that performs equipment diagnosis based on pressure, etc., equipment diagnosis is performed by using the equipment-specific process quantity judgment value calculated by calculation from the equipment-specific process quantity of the present invention and the empirically set process quantity judgment value. It goes without saying that the device for performing is effective.

Further, in the apparatus of the embodiment, as shown in FIG. 2, the operating time characteristic is displayed as a two-dimensional graph consisting of the operating time and the input signal level. It is also possible to change to.

[0044]

As described above, according to the equipment diagnostic apparatus of the present invention, the measured operating time is based on experience, with a wide type allowable range with some margin and a relatively narrow specific allowable range that is closer to the actual value. Compared with. Therefore, not only the serious abnormality can be detected with certainty, but also the sign can be discovered before the serious abnormality develops, and when the abnormality occurs, the degree of the abnormality can be grasped.

Further, the diagnostic result is displayed together with each allowable range on the operating time characteristics displayed in a two-dimensional graph. Therefore, the operator can visually understand the diagnosis result, and the operability of this device can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an equipment diagnostic apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing operating time characteristics and respective allowable ranges used in the apparatus of the embodiment.

FIG. 3 is a block diagram showing a schematic configuration of a conventional equipment diagnosis device.

[Explanation of symbols]

2 ... Equipment to be diagnosed, 4 ... Operating time measuring unit, 11 ... Characteristic storage unit, 12 ... Operating time characteristic, 13 ... Test signal output unit, 15
... operating time storage unit, 16 ... characteristic setting unit, 17 ... type allowable range, 18 ... correction unit, 19 ... minor abnormality determination unit, 20 ... serious abnormality determination unit, 21 ... unique allowable range calculation unit, 22 ... unique allowable range Storage unit, 23 ... Edit display control unit 24 ... CRT display device.

Claims (2)

[Claims] 1. A test signal is applied to a facility to be diagnosed, an operation time of the facility to be diagnosed with respect to the test signal is measured, and the operation time is determined by whether or not the measured operation time falls within an allowable range. In a facility diagnostic device for determining normality / abnormality of a facility to be diagnosed, a characteristic storage unit that stores an operating time characteristic of the facility to be diagnosed and a type allowable range that is empirically determined in advance according to the type of the facility to be diagnosed. , A test signal output unit that creates a test signal based on the operating time characteristics stored in the characteristic storage unit and applies the test signal to the diagnostic target equipment, and an operating time of the diagnostic target equipment that operates according to the test signal. An operating time measuring unit for measuring, an inherent allowable range storing unit for storing an inherent allowable range specific to the equipment to be diagnosed, and an operating time measured by the operating time measuring unit for storing the inherent allowable range. And a minor abnormality determination unit that determines a minor abnormality when it falls outside the specific allowable range stored in, and the operating time measured by the operating time measuring unit is outside the type allowable range stored in the specific allowable range storage unit. When a serious abnormality determination unit determines that the abnormality is a significant abnormality, and when the same test signal is applied to the diagnostic target equipment a plurality of times, a statistically unique allowance is obtained from the plurality of operation times measured by the operation time measurement unit. A facility diagnostic device comprising: a unique allowable range calculation unit that calculates a range and sets the range in the unique allowable range storage unit. 2. A diagnostic result display section for displaying the operating time characteristic of the characteristic storage section in a two-dimensional graph and superimposing each judgment result of each judgment section and each allowable range on the two-dimensional graph. The equipment diagnosis device according to claim 1.