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1. 发明专利

JPH0916254A PLANT ABNORMALITY DETECTING DEVICE 失效
公开(公告)号：JPH0916254A
公开(公告)日：1997-01-17
申请号：JP16886995
申请日：1995-07-04
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAGAWA ISAO , YAMAGUCHI TOMOHIRO
IPC分类号： G08B21/00 , G05B23/02 , G06T1/00 , G08B25/00
摘要： PROBLEM TO BE SOLVED: To automatically generate a mask in a short time without reference to the skillfulness of an operator, to detect abnormality occurring to an outline part, and remove noise except at the outline part. SOLUTION: The plant abnormality detecting device 1 converts a monitor image from a television camera 11 into a digital image by an A/D conversion part 2 and finds the difference image based on a reference image stored in a memory 7 for reference image storage by a difference processing part 3. A mask generation part 6 performs nonlinear luminance conversion for plural difference images found by the difference generation part 3 when an image state decision part 5 decides that there is no abnormality, and stores them in a memory 9 for mask generation and also adds them together to generate a gradation mask. This gradation mask is stored in a memory 10 for mask storage. A mask processing part 4 removes noise components by using the gradation mask stored in the memory 10 for mask storage and stores the result in a difference image storage memory 8. An image state decision part 5 decides whether or not abnormality occurs to the difference image stored in the memory 8.

2. 发明专利

JPH10222203A DIGITAL CONTROLLER 失效
公开(公告)号：JPH10222203A
公开(公告)日：1998-08-21
申请号：JP2641097
申请日：1997-02-10
申请人： MITSUBISHI HEAVY IND LTD
发明人： ISHIGURO MASAAKI , YAMAGUCHI TOMOHIRO
IPC分类号： G05B11/36 , G05B9/03 , G05B15/02 , G05B19/05
摘要： PROBLEM TO BE SOLVED: To duplex a servo card, to exchange the card during an operation and to improve reliability in a digital controller controlling the control valve of a power generation plant and the like. SOLUTION: The servo cards 31a and 31b are connected to the control valve 5 by duplexing them. Opening degree commands (S1a and S1b) from CPU 50 are inputted through a computer bus 14, are D/A-converted inside and are proportionally operated in proportional computing elements 1a and 1b. When switch circuits 4a and 4b are turned off, the command signals are outputted to the control valve 5. An external logic circuit 51 drives either a signal generator 7a or 7b. Either the switch circuit 4a or 4b is turned off by the signal and the control valve 5 is driven. The external logic circuit 51 drives the signal generator of the other servo card so that it is turned on when the servo card during the operation failure and the card which fails is turned off. The normal card is driven from the card during the failure. Then, 32 and 33 are connectors and the card can be exchanged when it fails.

3. 发明专利

JPH08305404A DIGITAL SIGNAL INPUT CIRCUIT 失效
公开(公告)号：JPH08305404A
公开(公告)日：1996-11-22
申请号：JP10401695
申请日：1995-04-27
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAKINO ETSUJI , EMOTO HIDEAKI , YAMAGUCHI TOMOHIRO , TOKORO NARUAKI
IPC分类号： G05B11/26 , G05B9/02 , G05B9/03 , G05B15/02 , G05B23/02
摘要： PURPOSE: To immediately recognize signal abnormality with a circuit fault at a computer by providing two pairs of buffer circuits and gate circuits, comparing the outputs of respective gate circuits and adding the signal of that compared result to data to be sent to the computer as a redundant bit at the digital signal input circuit of a digital controller for transmitting a digital signal inputted from a plant to the computer. CONSTITUTION: A DI card 2 for transmitting the digital signal from a plant 6 to a computer 5 is provided with two pairs of buffer circuits from 11-11 to 11-1n and from 11-21 to 11-2n and gate circuits 12-1 and 12-2, comparator 17 for digitally comparing the output signals of respective gate circuits, and logic circuit 18 for adding a parity bit to the output signal of the gate circuit 12-1, adding the signal of the compared result as the redundant bit, encoding that signal and transmitting it to the computer 5.

4. 发明专利

JPH08305403A ANALOG SIGNAL OUTPUT CIRCUIT 失效
公开(公告)号：JPH08305403A
公开(公告)日：1996-11-22
申请号：JP10401895
申请日：1995-04-27
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAKINO ETSUJI , TODA KATSUHIKO , EMOTO HIDEAKI , YAMAGUCHI TOMOHIRO
IPC分类号： G05B11/26 , G05B9/02 , G05B23/02
摘要： PURPOSE: To suppress an adverse influence on a plant with the abnormality of an analog output signal to a minimum by speedily detecting the operational abnormality of a DAC by comparing circuit signals before and after the DAC as the component of a circuit in an AO card to be used for a digital controller. CONSTITUTION: This circuit is provided with a first switcher 20 for switching digital output signals outputted from hold circuits from 11-1 to 11-n, second switcher 21 for switching the output signal of a DAC 12, ADC 22 for performing analog/digital conversion for the output signal of the second switcher 21, and comparator 23 for comparing the digital signal outputted from the first switcher 20 with the digital signal outputted from the ADC 22 and corresponding to the signal of the compared result of the comparator 23, the fault detection of the DAC 12 is performed.

5. 发明专利

JPH08305402A DIGITAL SIGNAL OUTPUT CIRCUIT 失效
公开(公告)号：JPH08305402A
公开(公告)日：1996-11-22
申请号：JP10401795
申请日：1995-04-27
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAKINO ETSUJI , EMOTO HIDEAKI , YAMAGUCHI TOMOHIRO , TOKORO NARUAKI
IPC分类号： G05B11/26 , G05B9/02 , G05B23/02
摘要： PURPOSE: To suppress an influence on a plant to a minimum by regulating and controlling the data update of a hold circuit corresponding to the output signal of a comparator to speedily transmit the operational abnormality of a circuit element to a computer. CONSTITUTION: This circuit is provided with two hold circuits 11-1 and 11-2, two buffer circuits 12 and 17 receiving digital signals, comparator 18 and gate control circuit 13 and the output signal of the first hold circuit 11-1 is sent through the first buffer circuit 12 to a plant 6. At the same time, the output of the first buffer circuit 12 is transmitted to the second buffer circuit 17, the comparator 18 digitally compares the second hold circuit 11-2 with the second buffer circuit 17 to detect the fault of the circuit element, and the data update of the gate control circuit 13 is regulated corresponding to the signal of the comparator. Therefore, the abnormality of a digital signal output circuit 4 is speedily detected and the operation of the gate control circuit 13 is regulated and controlled so that an erroneous digital output signal can be prevented from being sent to the plant.

6. 发明专利

JPH08312304A SERVO GUARD FOR DIGITAL CONTROLLING DEVICE 失效
公开(公告)号：JPH08312304A
公开(公告)日：1996-11-26
申请号：JP11315695
申请日：1995-05-11
申请人： MITSUBISHI HEAVY IND LTD
发明人： ISHIGURO MASAAKI , EMOTO HIDEAKI , YAMAGUCHI TOMOHIRO
IPC分类号： F01D25/00 , F01D17/24 , F02C9/00 , G05B23/02
摘要： PURPOSE: To double a servo guard without providing an outside selection circuit by switching analog signal output to be valid and invalid using the result of self-diagnosis by means of a diagnosis means and the selection signal input from the outside. CONSTITUTION: An actual control valve opening degree signal 11 is inputted as a signal for feed back and actual opening data 11 and 19 are sent to a CPU through a digital path. At this moment, an analog signal 27 for controlling a control valve based on the valve opening command signal sent from a CPU through a digital path is made to be switched to be valid and invalid using the result of self-diagnosis by means of diagnosis means 14-18, 20-26, and 28-30 having a self-diagnosis function and the selection signal input from the outside. This constitution makes it unnecessary to make a D/A or A/D converter intervene between the CPU and a servo guard body and makes it possible to analysis the cause in a short time when a trouble occurs due to a satisfactory self- diagnosis function.

7. 发明专利

JPH0822320A PLANT ABNORMALITY DETECTING DEVICE 失效
公开(公告)号：JPH0822320A
公开(公告)日：1996-01-23
申请号：JP15855494
申请日：1994-07-11
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAGAWA ISAO , YAMAGUCHI TOMOHIRO , SAKINO ETSUJI
IPC分类号： H04N7/18 , G05B23/02 , G06T7/00 , G06T7/40 , G08B25/00
摘要： PURPOSE:To provide a device which excludes the influence of vibration and the noise of a device and localizes an abnormality occurrence place. CONSTITUTION:This device is equipped with a memory 6 for connective video storage which inputs video from a camera 8 and stores the connective video, a Fourier transform part 4 which inputs the connective video from the memory 6 and performs Fourier transform, and an image state decision part 5 which inputs a power spectrum image from the transform part 4 and decides whether or not there is plant abnormality and then misdetection due to the distortion of the video under the influence of vibration and noises of a device to be monitored and a photographing device can be excluded, so the abnormality detection precision is improved and if abnormality such as oil leak, steam leak, the trespass of a man, and smoke generation is caused, the position of a value appearing in the power spectrum image can be localized, so that the abnormality can be detected with high efficiency.

8. 发明专利

JPH08115168A ANALOG SIGNAL READING CIRCUIT 失效
公开(公告)号：JPH08115168A
公开(公告)日：1996-05-07
申请号：JP25051894
申请日：1994-10-17
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAKINO ETSUJI , TODA KATSUHIKO , EMOTO HIDEAKI , YAMAGUCHI TOMOHIRO
IPC分类号： G06F3/05
摘要： PURPOSE: To easily execute the detection of a failure and the identification of a failure position in an analog signal reading circuit. CONSTITUTION: This analog signal reading circuit 1 is provided with two switches 12a, 12b respectively connected to plural buffer amplifiers 11a to 11n, an ADC 13a connected to one switch 12a and a computer 5, an ADC 13b connected to the other switch 12b, and a deviation detector 15 connected to both the ADCs 13a, 13b and the computer 5, so that a failure generated in the circuit 1 can be detected and the generation of a trouble 111 a plant or the like due to error data can be prevented. Since plural buffer amplifiers, plural switches and plural ADCs are successively connected, the ADCs are connected to the computer through a logic circuit and comparators connected to the output sides of the switches are connected to the logic circuit, the detection of a failure in the circuit 1 and the identification of a failure position can easily be executed.

9. 发明专利

JPH0816234A DEVICE FOR DETECTING ABNORMALITY OF PLANT 失效
公开(公告)号：JPH0816234A
公开(公告)日：1996-01-19
申请号：JP14616294
申请日：1994-06-28
申请人： MITSUBISHI HEAVY IND LTD
发明人： SAGAWA ISAO , YAMAGUCHI TOMOHIRO , SAKINO ETSUJI
IPC分类号： G01D21/00 , G05B23/02 , G06T1/00 , G08B25/00 , H04N7/18
摘要： PURPOSE:To surely separate and discriminate whether there is the intrusion of a foreign body such as a human the generation of smoke at the time of detecting abnormality and to attain instantaneous separation/discrimination without requiring timewise processing. CONSTITUTION:When a monitoring video is sent from a television camera 10 to a plant abnormality detector 1, an A/D conversion part 2 converts the video into a digital picture, and a difference processing part 3 finds out 3 difference picture between the digital picture and a reference picture stored in a reference picture storing memory 7 and stores the difference picture in a difference picture storing memory 8. A picture state judging part 5 judges whether a binarized area is larger than the difference picture or not, and when the area is larger, judges the existence of abnormality. A differential processing part 4 executes expansion processing after the binarization of the difference picture stored in the memory 8, executes the differential processing of the difference picture, stores the processed result in a differential picture storing memory 9, and extracts the differential picture of a changed part from the processed result. The judging part 5 judges the existence of a foreign body such as a human when the contour area of the differential picture is larger and judges the generation of smoke when the area is smaller.

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