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1. 发明专利

JPH0228514A METHOD AND DEVICE FOR DETECTING NOISE DISAPPEARANCE 失效
公开(公告)号：JPH0228514A
公开(公告)日：1990-01-30
申请号：JP2899789
申请日：1989-02-07
申请人： MITSUBISHI HEAVY IND LTD , IDEMITSU KOSAN CO
发明人： TOYODA ICHIRO , ARAYA TOSHIHIKO , KASEDA SHIGERU , TAKAHASHI KOICHI
IPC分类号： G01D1/18 , G01D1/16 , G01D21/00
摘要： PURPOSE:To detect a noise disappearance phenomenon by simple arithmetic operation by generating a specific warning when a counter number exceeds a predetermined threshold value and detecting the disappearance of noise components even if the output signal of a detector varies. CONSTITUTION:The output signal of the detector 1 is stored in a data storage means 3 through a data gathering means 2. Then a next arithmetic means 4 inputs the output signal of a means 2 for a current value and the output signal of a means 3 for a last value used as a past value which is a certain time before among past values stored in a means 3, calculates an absolute difference from a specific expression, and outputs the result A to a counter means 5. Then the means 5 compares the result A with a predetermined set value to increase or clear the counter value. Further, a limiter means 6 compares the output signal C of the means 5 with the predetermined set value and turns on a trigger signal when the signal C is larger than the set value. Then a notifying means 7 notifies the occurrence of the noise disappearance phenomenon when the signal T is on.

2. 发明专利

JPS63184115A DEVICE FOR DIAGNOSING FAULT OF FLOW METER IN LEVEL CONTROL SYSTEM 失效
公开(公告)号：JPS63184115A
公开(公告)日：1988-07-29
申请号：JP1581187
申请日：1987-01-26
申请人： MITSUBISHI HEAVY IND LTD , IDEMITSU KOSAN CO
发明人： ARAYA TOSHIHIKO , TOYODA ICHIRO , KASEDA SHIGERU
IPC分类号： G05D9/12 , G01F15/00 , G05B23/02
摘要： PURPOSE:To exactly decide a fault in respective flow meter, by adding a data collection part, for arithmetic parts, an identification part, and a display part on a targeted device. CONSTITUTION:In a flow meter fault diagnosing device used in a control system device for a liquid vessel 1, fluid is poured into the vessel 1 through an inflow pipe 3, and a flow rate is measured, and also, the liquid in the vessel 1 is flowed out from an outflow pipe 9 to the outside. Also, the height of a level in the vessel 1 is measured with a level meter 2, and an operating signal to a flow rate control valve 4 is outputted via a level controller 6. And the data collection part 10 inputs the output of the level meter 2, that of an inflow flow meter 7, the set value 5 of the level controller 6, and the output of an outflow flow meter 8, and distributes the inputs to a first - a fourth arithmetic parts 11-14. Furthermore, the identification part 15 inputs the outputs of the arithmetic parts 11-14, and identifies the abnormality of the inflow flow meter 7, and outputs two state signals for the generation of the fault and normal status, and the fact of the generation of the fault is displayed with a lamp, etc., on the display part 16 by the input.

3. 发明专利

JPH02187626A PLANT ABNORMALITY DIAGNOSTIC SYSTEM 失效
公开(公告)号：JPH02187626A
公开(公告)日：1990-07-23
申请号：JP808289
申请日：1989-01-17
申请人： MITSUBISHI HEAVY IND LTD , IDEMITSU KOSAN CO
发明人： ARAYA TOSHIHIKO , FUNAKOSHI RYOHEI , KASEDA SHIGERU , TAKAHASHI KOICHI
IPC分类号： G01D1/18 , G01D1/02 , G01D1/16 , G01D21/00
摘要： PURPOSE:To improve the reliability of diagnosis results of a system and to avoid unnecessary diagnosis by obtaining and outputting diagnostic symptoms indicating symptoms of abnormality of a plant or the like correspondingly to the operation condition or the like of the plant and performing abnormality diagnosis based on them. CONSTITUTION:The physical quantity at a specific point of the plant is measured by various sensors 2, and an average value is calculated with a prescribed period by an average value calculator 3. The measured value and the average value are inputted to a comparing means 4 to obtain the difference, and it is discriminated through an allowable range setter 6 by a comparator 7 whether this difference is within an allowable range set based on the average value or not, and the result is outputted as a diagnostic symptom signal to a diagnostic part 8. This part 8 compares it with information for detection of abnormality or the like stored in a knowledge memory 9 to diagnose whether individual hypotheses actually occur or not, and diagnostic results of high reliability are displayed on an output display part 10.

4. 发明专利

JPH0296613A APPARATUS FOR DETECTING ABNORMAL INDICATION IN PLANT 失效
公开(公告)号：JPH0296613A
公开(公告)日：1990-04-09
申请号：JP25059688
申请日：1988-10-03
申请人： MITSUBISHI HEAVY IND LTD , IDEMITSU KOSAN CO
发明人： ARAYA TOSHIHIKO , FUNAKOSHI RYOHEI , KASEDA SHIGERU , TAKAHASHI KOICHI
IPC分类号： G01D1/18 , G01D21/00 , G01L19/12
摘要： PURPOSE:To obtain an apparatus which detects the abnormal operating state of a plant in an early stage and issues highly reliable warning with less erroneous reporting by computing the average value of measured physical quantities in a specified time interval at a specified period, and comparing the value with an allowance value. CONSTITUTION:This apparatus is composed of the following devices: a measuring sensors 1 such as a pressure gage and a flowmeter which measure the physical quantities at specified points in a plant; an average value computer 2A which obtains the average value of the measured physical quantities; and a warning generator 3A which processes the output from the computer 2A and the outputs of the sensors 1 as specified and issues warning when the abnormality in the plant is detected. The computer 2A computes the average value of the physical quantities in a time period immediately before at, e.g. every predetermined specified time. In the warning generator 3A, the difference between the physical quantity at the specified point in the plant from the sensor 1 and the average value from the computer 2A is obtained with a subtracting device 6. Whether the obtained difference belongs to the allowance range which is set through an allowance-range setting device between the physical quantity and the average value is located at the outside of the allowance range, the warning is issued from a reporting device 8.

5. 发明专利

JPS63292310A INSTRUMENT TROUBLE DIAGNOSING DEVICE FOR LIQUID SURFACE CONTROL SYSTEM 失效
公开(公告)号：JPS63292310A
公开(公告)日：1988-11-29
申请号：JP12881887
申请日：1987-05-26
申请人： MITSUBISHI HEAVY IND LTD , IDEMITSU KOSAN CO
发明人： ARAYA TOSHIHIKO , TOYODA ICHIRO , KASEDA SHIGERU
IPC分类号： G01F13/00 , G05D9/12
摘要： PURPOSE:To avoid confusion of abnormality of the output of an exit flowmeter and trouble of a flow rate regulating valve by distinguishing impossibility and possibility of abnormality of the flow rate regulating valve from each other by combination between first-fourth computing elements and a discriminator to detect the abnormality. CONSTITUTION:Computing elements 21-24 use distributed data to calculate various variables V1-V4 and output signals, which indicate three states, namely, whether calculates values are in a normal operation range or are abnormally excessive on the positive side or are abnormally excessive on the negative side, to a discriminator 25. All output signals of computing elements 21-24 are inputted to the discriminator 25, and the discriminator 25 decides the occurrence of trouble of an exit flowmeter 11 to output a flowmeter trouble signal to an alarm device 26 if states of respective input signals have a certain pattern. The flowmeter trouble signal is inputted to the alarm device 26, and this device 26 uses an alarm means of an indicator like a lamp or an alarm like a buzzer to informs that the exit flowmeter 11 is in trouble. Thus, confusion of abnormality of the output of the exit flowmeter 11 and trouble of a flow rate regulating valve 9 is avoided when the output of the exit flowmeter 11 is abnormal.

6. 发明专利

JPH04218809A ABNORMALITY DETECTOR FOR CONTROL INSTRUMENT 失效
公开(公告)号：JPH04218809A
公开(公告)日：1992-08-10
申请号：JP8084491
申请日：1991-03-18
申请人： IDEMITSU KOSAN CO , MITSUBISHI HEAVY IND LTD
发明人： KASEDA SHIGERU , TAKAHASHI KOICHI , ARAYA TOSHIHIKO , FUNAKOSHI RYOHEI
IPC分类号： G05B23/02
摘要： PURPOSE:To present an abnormality detector for a control instrument which quickly and accurately detects the abnormality of the control instrument. CONSTITUTION:A deviation E between a set value SV of the control instrument and an actual state value PV is integrated, and an obtained integral value S is compared with a preliminarily set decided value D to detect the abnormality. Simultaneously, the stability against variance and the quickness of detection are secured by check of the change of the set value SV, check of the increase/ reduction of the deviation E, and comparison of an absolute value ¦E X S¦.

7. 发明专利

JPH0474930A DIAGNOSTIC METHOD FOR PROCESS ABNORMALITY 失效
公开(公告)号：JPH0474930A
公开(公告)日：1992-03-10
申请号：JP18779290
申请日：1990-07-16
申请人： IDEMITSU KOSAN CO
发明人： KASEDA SHIGERU
IPC分类号： G01D21/00 , G05B23/02
摘要： PURPOSE:To positively acquire and apply suitable diagnostic knowledge in a simple manner by linking nodes representing a phenomenon within a process with an arc representing the correlation of the nodes on the basis of the structure of devices for the process thereby to obtain an oriented graph, and constructing a network model for each arc which sets an influential factor indicating the degree of influences between the nodes. CONSTITUTION:Such an abnormality is considered that an indication LI1 of a level meter 61A is not coincident with an actual level LA1. Therefore, nodes 71, 72 which represent the actual level LA1 and indication LI1 of the level meter, and the arc 71A are set. A node 73 of a PID attribution is set for an adjuster 64 corresponding to its function. Moreover, when the actual level LA1 becomes low and a pump 66 sucks in vain, the actual flow rate FA2 is turned to zero and therefore, a node 81 of a transient attribution (MORE attribution) is set. An influential factor is set for each arc. The influential factor is distinguished between positive and negative in accordance with the influential relation between the phenomena of nodes, and moreover indicated by a continuous value of -1.0-1.0. Accordingly, a network model 70 is formed.

8. 发明专利

JPH03245018A ABNORMALITY DETECTION USING METER SIGNAL 失效
公开(公告)号：JPH03245018A
公开(公告)日：1991-10-31
申请号：JP4227690
申请日：1990-02-22
申请人： IDEMITSU KOSAN CO
发明人： KASEDA SHIGERU
IPC分类号： G01D21/00 , G05B23/02
摘要： PURPOSE:To detect abnormality at an early period by outputting an abnormality detection signal when the average pseudo amplitude obtained from the appearing time of peak data and the integrated value of pseudo amplitudes is deviated from a predetermined normal range. CONSTITUTION:The data of levels, temperatures, flow rates and the like are collected as process data in a data collecting part 1 and outputted as meter signals. Then, in a peak-data counting part 2, the number of times No of the peak data among the process data within a specified time To at the normal time is counted. Then, in a pseudo-amplitude integrating part 3, the integrated value SSUM of pseudo amplitudes Si within the specified time To is obtained. In an average pseudo-amlitude computing part 4, the average pseudo amplitude E is obtained based on the number of times No and the integrated values SSUM. In a conparator part 5, the anplitude E is compared with threshold values at the upper side and the lower side of a predetermined amplitude based on the process dada at the normal time. When the amplitude E is deviated from the normal range as a result of the comaprison, the fact that abnormality has occurred in the process data is notified through an announsing part 6.

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