EP1097439B1 - Verfahren und vorrichtung zur erkennung von driften, sprüngen und/oder ausreissern von messwerten - Google Patents
Verfahren und vorrichtung zur erkennung von driften, sprüngen und/oder ausreissern von messwerten Download PDFInfo
- Publication number
- EP1097439B1 EP1097439B1 EP99939929A EP99939929A EP1097439B1 EP 1097439 B1 EP1097439 B1 EP 1097439B1 EP 99939929 A EP99939929 A EP 99939929A EP 99939929 A EP99939929 A EP 99939929A EP 1097439 B1 EP1097439 B1 EP 1097439B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parameter
- measurement signal
- value
- alarm
- outlier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/20—Calibration, including self-calibrating arrangements
- G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
- G08B29/26—Self-calibration, e.g. compensating for environmental drift or ageing of components by updating and storing reference thresholds
Definitions
- the invention relates to a method for detecting an alarm condition or for Detection of drifts, jumps and / or outsiders by means of measured value acquisition means received Meßsignaf 17, with an alarm condition triggered is, if for a currently received Meßsignalwert or for one off Measured values derived value a predetermined limit or predetermined Interval limits are exceeded or will be.
- an alarm condition triggered is, if for a currently received Meßsignalwert or for one off Measured values derived value a predetermined limit or predetermined Interval limits are exceeded or will be.
- the threshold alarm system is for a fluctuating signal a given upper and lower threshold, where, when the signal is off an alarm is triggered which moves the interval defined by the thresholds becomes.
- the threshold alarm has the following disadvantages. He is unstable towards Outliers. He is not adaptive, d. H. Borders have to be set by hand and, especially with a signal with a drift, z. B. caused by a temporal Change in detector sensitivity, permanently adjusted. Become the limits of the threshold alarm set too far, it comes to long Delay times until an alarm is detected. If the limits are too narrow on the other hand, false alarms often occur. Therefore, in practice, a so-called "borderline” or an option, such as "all alarms off for two Furthermore, the threshold alarm system is not in the case suitable that a plurality of signals are monitored by an alarm system got to.
- the prior art is referred to the patent DE 35 23 232 C2. From this document is a fire alarm system for detecting and delivering a a change in a physical appearance of the environmental conditions corresponding analog value known.
- a scanning device for sampling an analog output from a detection section Detection signal within a certain period of time
- a data processing device for forming an average value from the sampling data, as well as a Memory device in which these sample data can be stored and an alarm device, the presence of a fire after evaluation of the mean indicates provided.
- the data processing device is formed such that the sampling data sequentially in the memory device be inscribed, and from a certain number of the last saved Sampling data is continuously formed a moving average, each the oldest in the sequence sample data storage value by the newest is replaced.
- DE 31 27 324 A1 discloses a method and an arrangement for increasing the sensitivity and noise immunity in a hazardous, in particular Fire alarm system, known.
- DE 44 17 574 C2 relates to a patient alarm detection under Using a target mode.
- a target mode In this procedure, at an intended Changing a physiological parameter of a patient dynamic Defines limits and then generates an alarm when the measured parameter values outside the dynamic limits. This document discloses Therefore, only a variant of the known threshold alarm.
- the object of the present invention is therefore to overcome the disadvantages of To avoid prior art, and in particular a method of the beginning so-called type such that over the prior art an "alarm situation" detected faster and with a lower false alarm rate becomes.
- the method becomes the currently received measured signal values with the mean and the fluctuation width representing scatter compared with the determined evaluation size is a measure of the existence represents a significant drift.
- An advantage of the method according to the invention is that an on-line Detection of outliers is provided.
- Femer is advantageous that the inventive Method is adaptive, d. H. for example, only physiological Limits must be preset. Furthermore, according to the invention drifting and / or jumps are detected automatically. Finally, the inventive Process only a short delay time.
- the evaluation size becomes by subtraction between the measured signal value and the calculated mean value with subsequent normalization of the difference.
- an outlier state is detected when the one weighted with the calculated scatter normalized difference between measured signal value and mean value of the set Outlier parameter exceeds.
- an alarm condition is detected, if the weighted normalized difference between Measured signal value and mean exceeds the set alarm parameter.
- a different substitution may be made, which is particularly preferred for statistical reasons. It can, for example a noise can be added or another imputation performed become. In this case, the outlier value can be determined in particular by an average value plus added random number, which derives from a probability distribution, be replaced. Finally, such a falsifying or falsified Measured value for the further calculation also simply be ignored.
- the mean of the successive Measurement signal values formed from the summation of the individual measured signal values is, where the number of summation steps by the width of the time window is determined.
- the standard deviation is used as the scatter, wherein the number of summation steps is determined by the width of the time window becomes.
- a computationally advantageous embodiment of the invention Method is that by means of a time delay a positioning of the time window is made, even small gradients to be able to recognize in the time course of the detected measured variable, so that also long-term drifts by a correspondingly far away, delayed Detect window (delayed moving window). Similarly, short-term Drifting at a correspondingly close, delayed window (delayed moving window) are recognized.
- the outlier parameter becomes a higher value set as the alarm parameter.
- the width of the time window preferably set to 10 temporally successive measured signal values and the outlier parameter is set to 6 and the alarm parameter is set to 3 becomes.
- a time window is provided in which on a length of i time sequential steps for those detected in the time window Measurement signal values an average value 2 and the associated scattering 3 of the measured signal values to calculate this mean.
- the mean will be not calculated from a series of the immediately preceding measured values, but from a time window of width ⁇ in the past with the selectable one Time delay d.
- the lower summation limit for the determination of the mean value thus results from the subtraction n-d- ⁇ , where n is the number of executed Time steps, d denotes the time delay and ⁇ the window width.
- the upper summation limit results from the subtraction n-d, so that the summation index i runs from n-d- ⁇ to n-d.
- the same summation limits apply to the determination of the dispersion 3.
- an incrementation is performed in a process step 4.
- the detected in a given time step n measurement signal value Y is compared with the calculated mean value in the initialization phase by a difference formation carried out, and this difference is provided with a normalization amount.
- the absolute difference is weighted with the dispersion by including the dispersion as a divisor.
- the evaluation variable thus obtained serves as a measure in the detection of occurring outlier states in this process step 4. Namely, if the evaluation variable obtained for the currently detected Meßsignalwert greater than a preset outlier parameter o (o> 0), the query results in this process step 4 that an outlier condition 6 is present.
- the outlier condition can be ignored for the following calculation or replaced with a "reasonable" value.
- imputation methods are suitable for this purpose. In this case, the sequence program returns to the increment instruction 4.
- the query block will contain 7 determines whether the data obtained for the currently detected Meßsignalwert Evaluation size is greater than a preset alarm parameter a. At a positively determined result is an alarm condition 8 before. In the embodiment In this case, a return to the initialization phase is made while if there is a negative result, a return to the increment instruction is made. As a boundary condition in the distinction between Outlier states and alarm conditions becomes a higher value for the outlier parameter Value assigned as the alarm parameter. By the distinction between Outlier states and alarm conditions will be differentiated between significant states and false measurements, with erroneous measurements may be caused by supply line failure or metrological artifacts.
- Fig. 2 shows the time course of a physiological measured variable.
- the abscissa axis serves as the time axis ⁇ CP , while the ordinate axis reproduces the amplitude of the measured signal.
- Fig. 3a shows a highly schematic representation of a drift.
- Fig. 3b shows a strong schematic representation of a jump.
- Fig. 3c shows a highly schematic Representation of an outlier. It is the temporal dependence of one measured signal.
- the internal parameters of the algorithm are the window width ⁇ ( ⁇ > 0), the delay d (d> 0), the initialization length i (i> ⁇ + d), the outlier parameter o (o> 0) and the alarm parameter a (a> 0).
- the algorithm After an initialization phase of the length of i time steps, the respective newly measured value with one estimated from the previous measured values Mean and associated dispersion (the empirical standard deviation) so far the algorithm is a natural generalization of the normal threshold alarm, where the mean and spread known be presupposed.
- the average is not from a series of calculated directly preceding measured values, but from a time window the width ⁇ in the past, with the selectable time delay d.
- Each newly measured Value is estimated with the current method according to the invention Mean value compared as follows: is the measured value more than the product from selectable outlier factor and scatter from estimated mean removed, it is classified as an outlier and is subject to further calculations the current mean (plus a random number with expected zero and Scatter according to the estimated spread). If this is not the case Case, but the measured value is more than the product of (selectable) alarm factor a and scatter away from the estimated mean, it is reported that There is a significant drift, depending on the direction of the deviation a drift up or down. In all other cases, no message is output. Then the next time step is processed.
- the window width ⁇ influences the fluctuations the estimated mean value - the fluctuations decrease proportionally to the root of ⁇ .
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Description
- Fig. 1
- ein Flußdiagramm mit den wesentlichen Prozeßschritten des erfindungsgemäßen Verfahrens;
- Fig. 2
- ein Meßwertspektrum der zeitlichen Entwicklung einer physiologischen Meßgröße;
- Fig. 3a
- eine stark schematische Darstellung einer Drift;
- Fig. 3b
- eine stark schematische Darstellung eines Sprungs; und
- Fig. 3c
- eine stark schematische Darstellung eines Ausreißers.
Claims (15)
- Verfahren zur Erkennung eines Alarmzustands von über Meßwerterfassungsmittel empfangenen Meßsignalwerten, wobei ein Alarmzustand ausgelöst wird, wenn für einen aktuell empfangenen Meßsignalwert wenigstens ein vorgegebener Grenzwert überschritten wird,
dadurch gekennzeichnet, daß in einem ersten Schritt für zeitlich aufeinanderfolgende Meßsignalwerte in einem einstellbaren Zeitfenster deren Lageparameter (2), der ein Mittelwert, Median, o.ä. ist, und ein entsprechender Streuparameter (3), der eine Standardabweichung, Quantil o.ä. ist, dieser Meßsignalwerte von dem Lageparameter berechnet wird, daß in einem zweiten Schritt jeder weitere nachfolgende Meßsignalwert zur Gewinnung einer jeweiligen Bewertungsgröße mit dem Lageparameter (2) verglichen und mit dem Streuparameter (3) gewichtet wird, und daß in einem dritten Schritt bei einer einen einstellbaren Ausreißerparameter überschreitenden Bewertungsgröße ein Ausreißerzustand (6) detektiert wird, während bei einer einen einstellbaren Alarmparameter überschreitenden Bewertungsgröße ein das Vorliegen eines signifikanten Drifts oder Sprungs der Meßsignalwerte indizierender Alarmzustand (8) detektiert wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Bewertungsgröße durch Differenzbildung zwischen dem Meßsignalwert und dem berechneten Lageparameter (2) mit anschließender Normierung der Differenz ermittelt wird.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Wichtung der Bewertungsgröße durch eine Divisionsbildung aus der normierten Differenz zwischen dem Meßsignalwert und dem Lageparameter (2) mit dem berechneten Streuparameter (3) vorgenommen wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß ein Ausreißerzustand (6) detektiert wird, wenn die mit dem berechneten Streuparameter (3) gewichtete normierte Differenz zwischen Meßsignalwert und Lageparameter (2) den eingestellten Ausreißerparameter übersteigt.
- Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß ein Alarmzustand (8) detektiert wird, wenn die mit dem berechneten Streuparameter (3) gewichtete normierte Differenz zwischen Meßsignalwert und Lageparameter (2) den eingestellten Alarmparameter übersteigt.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß bei Auftreten eines Ausreißerzustands (6) der entsprechende Meßsignalwert durch einen Ersatzwert ersetzt wird und der nächstfolgende Meßsignalwert bearbeitet wird.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß der Ersatzwert der aktuelle Lageparameter (2) ist.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß bei Auftreten eines Ausreißerzustands (6) der entsprechende Meßsignalwert für die weitere Berechnung ausgelassen wird und der nächstfolgende Meßsignalwert bearbeitet wird.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Lageparameter der aufeinanderfolgenden Meßsignalwerte aus der Summation der einzelnen Meßsignalwerte gebildet wird, wobei die Anzahl der Summationsschritte durch die Breite des Zeitfensters bestimmt wird.
- Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß als Streuparameter (3) die Standardabweichung zugrundegelegt wird, wobei die Anzahl der Summationsschritte durch die Breite des Zeitfensters bestimmt wird.
- Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß mittels einer Zeitverzögerung eine variable Positionierung des Zeitfensters vorgenommen wird.
- Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß der Ausreißerparameter auf einen höheren Wert als der Alarmparameter gesetzt wird.
- Verfahren nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß die Breite des Zeitfensters vorzugsweise auf zehn zeitlich aufeinanderfolgende Meßsignalwerte festgelegt wird und der Ausreißerparameter auf sechs und der Alarmparameter auf drei festgelegt wird.
- Vorrichtung zur Erkennung eines Alarmzustands von über Meßwerterfassungsmittel empfangenen Meßsignalwerten, wobei ein Alarmzustand ausgelöst wird, wenn für einen aktuell empfangenen Meßsignalwert wenigstens ein vorgegebener Grenzwert überschritten wird,
dadurch gekennzeichnet, daß die Vorrichtung Berechnungsmittelaufweist, um in einem ersten Schritt für zeitlich aufeinanderfolgende Meßsignalwerte in einem einstellbaren Zeitfenster deren Lageparameter (2), der ein Mittelwert, Median, o.ä. ist, und einen entsprechender Streuparameter (3), der eine Standardabweichung, Quantil o.ä. ist, dieser Meßsignalwerte von dem Lageparameter zu berechnen, wobei in einem zweiten Schritt jeder weitere nachfolgende Meßsignalwert zur Gewinnung einer jeweiligen Bewertungsgröße mit dem Lageparameter (2) verglichen und mit dem Streuparameter (3) gewichtet wird, und daß die Vorrichtung ferner Detektionsmittel aufweist, die in einem dritten Schritt bei einer einen einstellbaren Ausreißerparameter überschreitenden Bewertungsgröße ein Ausreißerzustand (6) detektieren, während die Detektionsmittel bei einer einen einstellbaren Alarmparameter überschreitenden Bewertungsgröße einen das Vorliegen eines signifikanten Drifts oder Sprungs der Meßsignalwerte indizierenden Alarmzustand (8) detektieren. - Vorrichtung nach Anspruch 14, mit einer Meßwerterfassungseinrichtung zum Empfang von Meßwertsignalen und einer Meßwertübertragungseinrichtung zur Wandlung und Verarbeitung der empfangenen Meßwertsignale sowie einer bei Überschreiten wenigstens eines Grenzwerts auslösbaren Alarmeinrichtung,
dadurch gekennzeichnet, daß zur Erfassung der Meßsignalwerte in einem nach Breite und Zeitverzögerung einstellbaren Zeitfenster eine Speichereinrichtung vorgesehen ist, daß für zeitlich aufeinanderfolgende Meßsignalwerte in dem einstellbaren Zeitfenster Berechnungsmittel zur Berechnung der Lageparameter (2) und der entsprechenden Streuungen (3) vorgesehen sind, und daß für die Gewinnung einer Bewertungsgröße eine Prozessoreinrichtung vorgesehen ist, die bei einer einen einstellbaren Alarmparameter überschreitenden Bewertungsgröße die Alarmeinrichtung betätigt.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19827508 | 1998-06-22 | ||
DE19827508 | 1998-06-22 | ||
DE19839047 | 1998-08-28 | ||
DE19839047A DE19839047A1 (de) | 1998-06-22 | 1998-08-28 | Verfahren und Vorrichtung zur Drifterkennung |
PCT/DE1999/001820 WO1999067758A1 (de) | 1998-06-22 | 1999-06-22 | Verfahren und vorrichtung zur erkennung von driften, sprüngen und/oder ausreissern von messwerten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1097439A1 EP1097439A1 (de) | 2001-05-09 |
EP1097439B1 true EP1097439B1 (de) | 2004-03-03 |
Family
ID=26046929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99939929A Expired - Lifetime EP1097439B1 (de) | 1998-06-22 | 1999-06-22 | Verfahren und vorrichtung zur erkennung von driften, sprüngen und/oder ausreissern von messwerten |
Country Status (4)
Country | Link |
---|---|
US (1) | US6556957B1 (de) |
EP (1) | EP1097439B1 (de) |
AT (1) | ATE261164T1 (de) |
WO (1) | WO1999067758A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011120406A1 (de) | 2011-12-08 | 2013-06-13 | Trium Analysis Online Gmbh | Verfahren und Vorrichtung zum Anzeigen von Alarmzuständen |
Families Citing this family (18)
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US6618631B1 (en) * | 2000-04-25 | 2003-09-09 | Georgia Tech Research Corporation | Adaptive control system having hedge unit and related apparatus and methods |
CA2413285A1 (en) * | 2000-06-21 | 2001-12-27 | Will C. Lauer | Liveexception system |
JP3832281B2 (ja) * | 2001-06-27 | 2006-10-11 | 日本電気株式会社 | 外れ値ルール生成装置と外れ値検出装置、その外れ値ルール生成方法と外れ値検出方法及びそのプログラム |
DE60212717T2 (de) * | 2002-03-13 | 2007-06-28 | Borealis Technology Oy | Inspektionsapparat für deformierte rohre |
US20030177850A1 (en) * | 2002-03-19 | 2003-09-25 | The Washington Post Company | System and method for verifying the roll roundness of rolls of paper used for newspapers |
DE10345717B4 (de) * | 2003-10-01 | 2005-12-08 | Trium Analysis Online Gmbh | Verfahren und Vorrichtung zur Bestimmung der fötalen Herzfrequenz |
US7249287B2 (en) * | 2004-04-19 | 2007-07-24 | General Electric Company | Methods and apparatus for providing alarm notification |
WO2006133348A2 (en) * | 2005-06-08 | 2006-12-14 | Philip Michael Sher | Fluctuating blood glucose notification threshold profiles and methods of use |
US7215129B1 (en) * | 2006-03-30 | 2007-05-08 | General Electric Company | Multi tip clearance measurement system and method of operation |
US7917338B2 (en) | 2007-01-08 | 2011-03-29 | International Business Machines Corporation | Determining a window size for outlier detection |
AT507019B1 (de) * | 2008-07-04 | 2011-03-15 | Siemens Vai Metals Tech Gmbh | Verfahren zur überwachung einer industrieanlage |
US8046468B2 (en) * | 2009-01-26 | 2011-10-25 | Vmware, Inc. | Process demand prediction for distributed power and resource management |
US8798889B2 (en) | 2010-12-20 | 2014-08-05 | Ford Global Technologies, Llc | Automatic transmission and method of control for rejecting erroneous torque measurements |
DE102012200997A1 (de) * | 2011-08-29 | 2013-02-28 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Prüfung der korrekten Funktion einer seriellen Datenübertragung |
US8929236B2 (en) * | 2012-07-30 | 2015-01-06 | Hewlett-Packard Development Company, L.P. | Network flow analysis |
DE102015223253A1 (de) * | 2015-11-25 | 2017-06-01 | Minimax Gmbh & Co. Kg | Verfahren zum Bestimmen von Schwellenwerten einer Zustandsüberwachungseinheit für eine Brandmelder- und/oder Löschsteuerzentrale sowie Zustandsüberwachungseinheit und System damit |
EP3833265B1 (de) * | 2018-08-08 | 2022-03-09 | Koninklijke Philips N.V. | Positionierung einer interventionellen vorrichtung in bezug auf eine ultraschallbildebene |
EP3632333A1 (de) | 2018-10-05 | 2020-04-08 | Koninklijke Philips N.V. | Positionierung einer interventionellen vorrichtung in bezug auf eine ultraschallbildebene |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4587620A (en) * | 1981-05-09 | 1986-05-06 | Nippon Gakki Seizo Kabushiki Kaisha | Noise elimination device |
DE3127324A1 (de) * | 1981-07-10 | 1983-01-27 | Siemens AG, 1000 Berlin und 8000 München | Verfahren und anordnung zur erhoehung der ansprechempfindlichkeit und der stoersicherheit in einer gefahren-, insbesondere brandmeldeanlage |
EP0121048B1 (de) | 1983-03-04 | 1987-05-06 | Cerberus Ag | Schaltungsanordnung zur Störpegel-Überwachung von Meldern, die in einer Gefahrenmeldeanlage angeordnet sind |
US4846190A (en) * | 1983-08-23 | 1989-07-11 | John Erwin R | Electroencephalographic system data display |
JPS6115300A (ja) * | 1984-06-29 | 1986-01-23 | ホーチキ株式会社 | 火災警報装置 |
US4639885A (en) * | 1984-12-24 | 1987-01-27 | United Technologies Corporation | EMI suppression for electronic engine control frequency signal inputs |
CH669859A5 (de) * | 1986-06-03 | 1989-04-14 | Cerberus Ag | |
US5464012A (en) * | 1993-09-13 | 1995-11-07 | Hewlett-Packard Company | Patient alarm detection using target mode |
-
1999
- 1999-06-22 WO PCT/DE1999/001820 patent/WO1999067758A1/de active IP Right Grant
- 1999-06-22 AT AT99939929T patent/ATE261164T1/de not_active IP Right Cessation
- 1999-06-22 EP EP99939929A patent/EP1097439B1/de not_active Expired - Lifetime
- 1999-06-22 US US09/720,580 patent/US6556957B1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011120406A1 (de) | 2011-12-08 | 2013-06-13 | Trium Analysis Online Gmbh | Verfahren und Vorrichtung zum Anzeigen von Alarmzuständen |
Also Published As
Publication number | Publication date |
---|---|
ATE261164T1 (de) | 2004-03-15 |
US6556957B1 (en) | 2003-04-29 |
EP1097439A1 (de) | 2001-05-09 |
WO1999067758A1 (de) | 1999-12-29 |
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