WO2019187106A1 - 水分混入検出装置、水分混入検出プログラム、水分混入検出方法、及び水分混入検出システム - Google Patents
水分混入検出装置、水分混入検出プログラム、水分混入検出方法、及び水分混入検出システム Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 69
- 230000007613 environmental effect Effects 0.000 claims abstract description 77
- 238000005259 measurement Methods 0.000 claims abstract description 73
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 138
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 133
- 238000011109 contamination Methods 0.000 claims description 79
- 239000010687 lubricating oil Substances 0.000 claims description 38
- 230000000694 effects Effects 0.000 claims description 37
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- 238000002485 combustion reaction Methods 0.000 claims description 10
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- 238000000034 method Methods 0.000 description 15
- 239000010721 machine oil Substances 0.000 description 10
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- 230000002159 abnormal effect Effects 0.000 description 5
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- 230000005856 abnormality Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2847—Water in oils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2888—Lubricating oil characteristics, e.g. deterioration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/30—Oils, i.e. hydrocarbon liquids for lubricating properties
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
Definitions
- the present invention relates to a moisture contamination detection apparatus, a moisture contamination detection program, a moisture contamination detection method, and a moisture contamination detection system.
- a machine oil such as a lubricating oil
- the function as the machine oil decreases.
- the amount of water dissolved in the machine oil exceeds the saturated water amount and appears in the oil as free water, the machine is likely to fail or break.
- an internal combustion engine such as a diesel engine or an external combustion engine such as a steam turbine
- seizure due to oil film breakage is likely to occur, resulting in damage such as bearing damage. The possibility becomes high.
- the amount of moisture dissolved in the machine oil is monitored and managed. Since the saturated water content of machine oil varies depending on factors such as the type of machine oil, the period of use, and the temperature during use, the absolute water content dissolved in the oil (for example, ppm) ) Is considered to be more appropriate to use the water activity value (Water Activity, Aw), which is the relative water content.
- the water activity value is calculated from the capacitance and oil temperature in the lubricating oil, and the calculated water content
- a device for diagnosing that the lubricating oil is in an abnormal state is described when the activity value exceeds a threshold value determined based on the result of the rolling and sliding fatigue life test.
- the present invention has been made in view of the above problems. That is, the subject of this invention is providing the water
- the present inventors use a predicted value (a value assumed in a normal case) related to the amount of water in oil instead of a predetermined threshold as a comparison target of an actual value related to the amount of water in oil. I thought that the above problem could be solved. Further, the present inventors provide information indicating that a predetermined condition is satisfied when the relationship between the two satisfies a predetermined condition, for example, a difference between an actual measurement value and a predicted value is outside a predetermined allowable range (for example, For example, it was considered that an unexpected or abnormal increase in water content could be detected even in a range that was determined to be normal by a conventional method.
- the inventors have determined that the amount of water in the oil and the environmental data of the oil (for example, the oil temperature) and the data related to the environment of the oil (for example, the ambient temperature and humidity). Have a correlation, and it has been found that the amount of water in the oil can be predicted by measuring the environmental data of the oil and the data related to the surrounding environment of the oil, and the present invention has been completed.
- the environmental data of the oil for example, the oil temperature
- the data related to the environment of the oil for example, the ambient temperature and humidity
- the gist of the present invention is as follows.
- a water contamination detection device for detecting water contamination in oil, based on the correlation between the environmental data of oil and / or the data related to the surrounding environment of the oil and the data related to the amount of water in the oil, Predicted data calculating means for calculating predicted data relating to the moisture content in oil from the measured environmental data for oil and / or data relating to the surrounding environment of the oil, and measured data obtaining means for obtaining measured data relating to the moisture content in the oil
- a condition determination means for comparing the acquired actual measurement data with the calculated prediction data to determine whether the relationship between the actual measurement data and the prediction data satisfies a predetermined condition; and the relationship between the actual measurement data and the prediction data
- a water contamination detection apparatus comprising: information output means for outputting information indicating that the predetermined condition is satisfied when it is determined that the predetermined condition is satisfied.
- the predetermined condition is that the difference between the predicted data and the measured data is greater than or equal to a predetermined allowable range, or the amount of change per unit time of the difference between the predicted data and the measured data is greater than or equal to the predetermined allowable range.
- a moisture contamination detection program for causing a computer device to detect moisture contamination in oil.
- the computer device is related to oil environment data and / or data related to the oil environment and the amount of moisture in the oil.
- Predicted data calculating means for calculating predicted data related to the amount of water in the oil from the measured environmental data of the oil and / or data related to the surrounding environment of the oil based on the correlation with the data, measured data regarding the amount of water in the oil.
- the actual measurement data acquisition means for acquiring the condition
- the condition determination means for comparing the acquired actual measurement data and the calculated prediction data, and determining whether the relationship between the actual measurement data and the prediction data satisfies a predetermined condition, actual measurement data
- information output means for outputting information indicating that the predetermined condition is satisfied when it is determined that the relationship between the prediction data and the predicted data satisfies the predetermined condition To ability, moisture contamination detection program.
- a moisture contamination detection method that is executed in a moisture contamination detection device that detects moisture contamination in oil, and includes: environmental data of oil and / or data related to the surrounding environment of oil and data related to the amount of moisture in the oil. Based on the correlation, calculate predicted data related to the amount of water in the oil from the measured environmental data of the oil and / or data related to the surrounding environment of the oil, obtain the measured data related to the amount of water in the oil, and obtain the actual measured data Compare the data with the calculated prediction data to determine whether the relationship between the actual measurement data and the prediction data satisfies a predetermined condition, and determine that the relationship between the actual measurement data and the prediction data satisfies a predetermined condition A moisture contamination detection method that outputs information indicating that a predetermined condition is satisfied when it is performed.
- a moisture contamination detection device for detecting moisture contamination in a lubricating oil used in an internal combustion engine or an external combustion engine of a ship, and a moisture content measuring device capable of measuring actual measurement data regarding the moisture content in the lubricating oil.
- a moisture contamination detection system having a moisture contamination detection device measured based on the correlation between the environmental data of the lubricating oil and / or the data related to the surrounding environment of the lubricating oil and the data related to the amount of water in the lubricating oil.
- Prediction data calculation means for calculating prediction data related to the amount of water in the lubricating oil from environmental data of the lubricating oil and / or data related to the surrounding environment of the lubricating oil, and the amount of water in the lubricating oil measured by the water content measuring device
- Measured data acquisition means for acquiring measured data, the acquired measured data and the calculated predicted data are compared, and there is a relationship between the measured data and the predicted data.
- An information output that outputs information indicating that the predetermined condition is satisfied when it is determined that the relationship between the measured data and the predicted data satisfies the predetermined condition And a moisture contamination detection system.
- the present invention it is possible to determine whether or not the amount of water in the oil is really normal under the environmental conditions.
- oil refers to, for example, machine oil such as lubricating oil, cooling oil, and hydraulic oil.
- water content in oil refers to, for example, the amount of water dissolved in oil indicated by using a predetermined scale.
- FIG. 1 is an example of a block diagram showing a configuration of a moisture contamination detection system according to an embodiment of the present invention.
- the moisture contamination detection system 5 includes a moisture contamination detection device 1, a communication network 2, an environmental data measurement device 3, and a moisture content measurement device 4.
- the environmental data measuring device 3 is a device that measures oil environmental data and / or data related to the environment surrounding the oil (hereinafter also referred to as “environmental data”), and includes at least environmental data measuring means 31.
- environmental data measuring device 3 a conventionally known device can be appropriately employed depending on the measurement object. Further, there may be a plurality of environmental data measuring devices 3 according to the number of measurement objects.
- the environmental data of the oil to be measured and the data related to the surrounding environment of the oil are particularly limited if, for example, there is a correlation with the amount of water in the oil and the prediction data of the amount of water in the oil can be calculated.
- Specific examples of oil environmental data include oil temperature and hydraulic pressure.
- Specific examples of data related to the environment surrounding oil include temperature, humidity, or atmospheric pressure at a predetermined position around the oil.
- One type of measurement target may be used, or two or more types may be combined. From the standpoint that the measurement is simple and the accuracy of the prediction data can be increased, the temperature and humidity at a predetermined position around the oil are preferably measured.
- the “predetermined position around the oil” is not particularly limited as long as it is a position where environmental data correlated with the amount of water in the oil can be measured.
- the inside of the machine where the oil is used What is necessary is just to determine suitably according to the kind, installation aspect, etc. of this machine, such as the vicinity of this machine, or any position in the sealed space or semi-sealed space where this machine was installed.
- Preferable specific examples include any position in the engine room and the engine room.
- the “sealed space” refers to an area where it is possible to maintain a state in which inflow and outflow of air hardly occur.
- the “semi-enclosed space” refers to an area where, for example, a state where inflow and outflow of air only partially occurs can be maintained.
- the water content measuring device 4 is a device for measuring actual measurement data relating to the water content in oil, and includes at least a water content measuring means 41.
- a conventionally known device can be appropriately employed depending on the scale used.
- the scale used when measuring the water content is not particularly limited, and may be an absolute water content (for example, ppm) or a relative water content such as a water activity value. Regardless of the type of oil, the period of use, the temperature at the time of use, etc., it is preferable to use the water activity value from the viewpoint that the risk of free water generation can be evaluated directly and easily.
- the environmental data measurement device 3 and the moisture content measurement device 4 are connected to the moisture contamination detection device 1 via the communication network 2.
- the environmental data measuring device 3 and the water content measuring device 4 do not need to be always connected to the moisture contamination detecting device 1, and only need to be connectable if necessary.
- the connection may be a wireless connection or a wired connection.
- the environmental data measured by the environmental data measuring device 3 and the actual measurement data regarding the amount of water in the oil are transmitted to the moisture contamination detecting device 1 via the communication network 2.
- the moisture contamination detection system 5 may not include the communication network 2.
- the data measured by the environmental data measuring device 3 and the water content measuring device 4 may be input by the user directly to the moisture contamination detecting device 1, for example.
- the moisture contamination detection device 1 includes an environmental data acquisition unit 11, a prediction data calculation unit 12, an actual measurement data acquisition unit 13, a condition determination unit 14, an information output unit 15, and an allowable range specifying unit 16.
- the moisture contamination detection device 1 is a computer device including at least a control unit (central processing unit: Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and a storage unit. is there.
- the ROM or storage unit of the moisture contamination detection apparatus 1 stores a program for executing each process by the moisture contamination detection apparatus 1 in the moisture contamination detection system according to the embodiment of the present invention.
- Each process by the moisture contamination detection apparatus 1 is a process realized by each means described in detail below, or a process described later using the flowchart of FIG.
- the environmental data acquisition unit 11 has a function of acquiring environmental data measured by the environmental data measuring device 3.
- the environmental data acquisition unit 11 receives environmental data and the like from the environmental data measuring device 3 via the communication network 2, for example.
- the received environmental data or the like is preferably stored in the storage unit.
- the prediction data calculation means 12 measures the environmental data based on the correlation (hereinafter also simply referred to as “correlation”) between the environmental data of the oil and / or the data related to the surrounding environment of the oil and the data related to the amount of water in the oil. It has a function of calculating prediction data relating to the amount of water in oil from environmental data measured by the device 3.
- Correlation is normal, for example, where it is estimated that there is no unexpected increase in the amount of water in the oil, or that the amount of water in the oil is assumed to be at a value normally assumed under the environmental conditions. In a state, it can be obtained by actually measuring the amount of water in the oil and environmental data over a predetermined period, and processing each obtained data by a predetermined statistical method. That is, the correlation can be said to be a function having the amount of water in oil as an objective variable and environmental data or the like as explanatory variables.
- the statistical method is not particularly limited, but from the viewpoint that it is simple and the accuracy of the prediction data is high, for example, a single regression analysis using the amount of water in oil as an objective variable and one kind of environmental data as an explanatory variable.
- the multiple regression analysis using two or more kinds of environmental data as explanatory variables is more preferable.
- the predetermined period is not particularly limited and may be appropriately determined according to the type of machine in which the oil is used. From the viewpoint of improving the accuracy of the prediction data, for example, two weeks, one month It is preferable that the period is long to some extent, such as a period of two months or four months or more.
- the correlation and the data measured in the past are preferably stored in, for example, the ROM or the storage unit of the moisture contamination detection device 1.
- the predicted data calculating unit 12 substitutes values such as the environmental data acquired by the environmental data acquiring unit 11 into a function stored as a correlation, and calculates predicted data related to the amount of moisture in the oil.
- the correlation is configured to be sequentially updated based on the environmental data acquired by the prediction data calculation unit 12 and the actual measurement data regarding the amount of water in oil acquired by the actual measurement data acquisition unit 13 described later. You may do it. In other words, newly acquired environmental data, etc. and actual measurement data related to the moisture content are added to the measured data related to the environmental data, etc. and moisture content measured in the past at a predetermined timing, and new statistical processing is performed on the data including the added data. Thus, the correlation may be updated. With such a configuration, it is possible to further improve the accuracy of the prediction data.
- the position where the environmental data used for calculating the correlation is measured and the position where the environmental data acquired by the environmental data acquisition unit 11 is measured. It is preferable that the positions are substantially the same.
- the correlation varies depending on the type of machine in which the oil is used and the usage environment, the type and age of the oil, and the measurement position of environmental data. For example, when the lubricating oil used for the internal combustion engine of a ship is given as an example, the correlation differs for each ship.
- the actual measurement data acquisition means 13 has a function of acquiring actual measurement data related to the amount of water in the oil measured by the water content measuring device 4.
- the actual measurement data acquisition unit 13 receives actual measurement data related to the amount of moisture in the oil from the moisture amount measuring device 4 via the communication network 2, for example. It is preferable that the actually measured data regarding the received moisture content is stored in the storage unit.
- the condition determination unit 14 compares the actual measurement data acquired by the actual measurement data acquisition unit 13 with the prediction data calculated by the prediction data calculation unit 12, and determines whether the relationship between the actual measurement data and the prediction data satisfies a predetermined condition. It has a function to determine whether or not.
- the predetermined condition is, for example, a condition for determining whether or not the amount of water in the oil is normal under the environmental conditions, and it can be said that the predicted data and the actually measured data are abnormally separated. It is a condition.
- the predetermined condition for example, the difference between the predicted data and the measured data is greater than or equal to a predetermined allowable range, or the amount of change per unit time of the difference between the predicted data and the measured data is greater than or equal to the predetermined allowable range.
- the predetermined allowable range may be set in advance by the user, for example, or a value specified by the allowable range specifying means 16 described later may be used.
- the information output unit 15 has a function of outputting information indicating that the predetermined condition is satisfied when the condition determining unit 14 determines that the relationship between the actually measured data and the predicted data satisfies the predetermined condition.
- the information output means 15 preferably outputs information for displaying on a predetermined display device that a predetermined condition is satisfied or outputting a sound by a predetermined audio output device. That is, the information output means 15 outputs a visual or audible alarm (hereinafter also referred to as “alarm”) when it is determined that the amount of water in the oil is abnormal under the environmental conditions. Preferably there is.
- the permissible range specifying means 16 has a function of specifying a permissible range used when determining whether or not the relationship between the measured data and the predicted data satisfies a predetermined condition.
- the allowable range specifying unit 16 preferably specifies the allowable range based on, for example, a history of the difference between the predicted data and the actual measurement data or a history of the amount of change per unit time of the difference between the predicted data and the actual measurement data.
- the allowable range is, for example, a range in which the difference between the prediction data and the actual measurement data is not abnormally deviated, that is, the actual measurement data is in a normal range.
- the allowable range specifying unit 16 may specify an upper limit allowable as the difference between the predicted data and the actually measured data.
- the moisture contamination detection process when moisture contamination such as an unexpected or abnormal increase in the amount of moisture in the lubricating oil used in the ship's internal combustion engine (hereinafter also referred to as “main engine”) is detected.
- main engine internal combustion engine
- the use of oil and the machine in which the oil is used are not limited to the above examples.
- the machine oil such as cooling oil and hydraulic oil, the external combustion engine in which the machine oil is used, and other Can be widely applied to factory machines.
- the water content in the oil is a water activity value (unit: aw) measured using a commercially available water activity value measurement sensor.
- temperature and humidity measured in the engine room in which the internal combustion engine is installed are used as environmental data and the like.
- FIG. 2 is an example of a graph representing actual measurement data of the amount of water in oil and measurement data related to the environment surrounding the oil according to the embodiment of the present invention, and supports the above findings of the present inventors.
- FIG. 2 shows the main engine load, engine room temperature and humidity (relative humidity), and the period from 9:00 on July 9, 2017 to midnight on July 24, 2017.
- the water activity value in the lubricating oil is measured every hour, and the obtained values are plotted.
- “ME Load” indicates the main engine load
- ER Temp indicates the temperature in the engine room
- ER Humid indicates the humidity in the engine room
- WIO indicates the water activity value in the lubricating oil.
- FIG. 2 shows that there is a correlation between the water activity value in the lubricating oil and the temperature and humidity in the engine room.
- a multiple regression analysis was performed with the water activity value in the lubricating oil as the objective variable and the temperature and humidity in the engine room as the explanatory variables.
- the correlation is obtained, and the obtained correlation (for example, multiple regression equation) is stored in the storage unit of the moisture contamination detection apparatus 1.
- the water activity value in the lubricating oil, the temperature and humidity in the engine room are higher in the sections where the main engine load is greatly increased or decreased, such as immediately after the start of operation of the main engine and after the operation is stopped.
- the correlation with is weak. Therefore, from the viewpoint of improving the accuracy of the prediction data, it is preferable not to use data in such a section when performing a statistical process and calculating a function indicating a correlation.
- FIG. 3 is an example of a flowchart of the moisture mixing detection process according to the embodiment of the present invention.
- the environmental data measuring device 3 measures the temperature and humidity in the engine room (step A1).
- the environmental data measuring device 3 transmits data relating to the measured temperature and humidity to the moisture contamination detecting device 1 (step A2).
- the data transmitted in step A2 preferably includes information regarding the time when the data was measured.
- the environmental data measuring device 3 repeats the processing from step A1 to step A2 continuously or at predetermined intervals.
- the water content measuring device 4 measures the water activity value in the lubricating oil (step B1). Next, the water content measuring device 4 transmits data relating to the measured water activity value to the water contamination detection device 1 (step B2).
- the data transmitted in step B2 preferably includes information regarding the time when the data was measured.
- the moisture content measuring device 4 repeats the processing from step B1 to step B2 continuously or at predetermined intervals.
- the moisture contamination detection apparatus 1 receives data related to the temperature and humidity transmitted in step A2, and receives data related to the water activity value transmitted in step B2 (step S1). Each received data is preferably stored in the storage unit in association with data relating to the measured time.
- the moisture contamination detection device 1 calculates a predicted value of the moisture activity value in the lubricating oil based on the correlation stored in the storage unit and the data regarding the temperature and humidity received in Step S1 (Step S1). S2).
- a predicted value is calculated by substituting temperature and humidity into a multiple regression equation (bivariate linear function) calculated as a correlation.
- the correlation may be updated using each received new data, triggered by the reception of each newly measured data in step S1.
- the predicted value may be calculated using an equation as shown in FIG.
- FIG. 4 is an example of a graph showing the relationship between the water activity value and the temperature at each humidity according to the embodiment of the present invention.
- the predicted value of the water activity value can be calculated by substituting the measured temperature into the uppermost straight line expression indicated by the solid line. .
- the predicted value can be calculated by substituting the value of the temperature into a linear equation corresponding to each humidity.
- the moisture contamination detection apparatus 1 determines whether or not the data regarding the water activity value received in step S1, that is, the relationship between the actually measured value of the water activity value and the predicted value calculated in step S2 satisfies a predetermined condition. Is determined (step S3).
- the actually measured value and the predicted value to be compared are preferably values based on data measured at substantially the same time. Step S3 will be described in more detail in a later paragraph.
- step S3 When it is determined in step S3 that the predetermined condition is satisfied (Yes in step S3), that is, when moisture contamination is detected, the moisture contamination detection apparatus 1 outputs information indicating that the predetermined condition is satisfied. (Step S4), the process ends.
- step S4 for example, a message indicating that moisture contamination has been detected on a predetermined display device is displayed, or a sound is output from a predetermined audio output device to indicate that moisture contamination has been detected. A visual and / or audible alarm is output.
- step S3 If it is determined in step S3 that the predetermined condition is not satisfied (No in step S3), the process is terminated.
- the water contamination detection device 1 receives data on temperature and humidity from the environmental data measurement device 3 and receives the data on the water activity value from the water content measurement device 4 every time the processing of the above steps S1 to S4 is performed. repeat.
- the predetermined condition is that the difference between the predicted value and the actually measured value is greater than or equal to a predetermined allowable range set in advance.
- the allowable range can be appropriately set based on, for example, data used when calculating a function indicating a correlation, a residual analysis of the data, and the like. For example, when the allowable range is set to 0.15 aw and the predicted value is 0.25 aw, it is determined that a predetermined condition is satisfied if the actual measurement value is 0.40 aw or more, and moisture contamination is detected. An alarm indicating that is output.
- FIG. 5 is a graph showing an example of an alarm range according to the embodiment of the present invention.
- the straight line L shown in FIG. 5 is a single regression equation with the water activity value as an objective variable and the temperature in the engine room as an explanatory variable for easy understanding.
- a region having a threshold value T1 (water activity value 0.5 aw) or higher is set as a “High Alarm” region
- a region having a threshold value T2 (water activity value 0.9 aw) or higher is set as a “High-High Alarm” region.
- these areas are areas where there is a high risk of free water occurrence, they are areas where alarms have been issued in the past.If actual measurement values are included in these areas, free water is used regardless of the predicted value. An alarm indicating that the risk of occurrence is high is output.
- the values of the thresholds T1 and T2 may be changed as appropriate.
- the alarm range is only the “High Alarm” region and the “High-High Alarm” region as in the past, that is, if the alarm range is only a range equal to or more than a uniform threshold value, water contamination occurs in the lubricating oil. Even if it is, an alarm is not issued unless a uniformly set threshold value is exceeded, so it is not possible to detect moisture contamination early.
- the threshold value for indicating the “High Alarm” region is set to a lower value, the saturated moisture content changes due to a change in the temperature of the lubricating oil, or is normally assumed under the environmental conditions. An alarm is also issued when the water activity value increases within a range that can be considered normal due to an increase in the amount of water.
- an area in which the difference between the predicted value and the actual measurement value is equal to or greater than the predetermined allowable range P is set as “added alarm range”, and a new alarm range that has not existed in the past is added. It enables early detection of moisture contamination and prevents alarms from being issued despite normal conditions.
- the “alarm range to be added” is a range deviating from the predicted value by a predetermined allowable range P or more, that is, a range greatly deviating from a value that should be in a normal state. It can be determined that the lubricating oil is not in a normal state and water is mixed.
- the predetermined permissible range P may be configured to be updated based on the history of the difference between the predicted value and the actual value or the history of the amount of change per unit time of the difference between the predicted value and the actual value. good. With such a configuration, it is possible to further improve the accuracy of detecting moisture contamination.
- an alarm is issued when the measured value is larger than the predicted value by a predetermined allowable range P or more, but an alarm is also issued when the measured value is smaller than the predetermined allowable range P or more. May be issued.
- the measured value is smaller than the predetermined allowable range P, the possibility that moisture has been mixed is low, but some other problem may have occurred.
- the allowable range when the actual measurement value deviates upward from the predicted value and the allowable range when the actual measurement value deviates downward from the predicted value may be different.
- step S3 it may be a predetermined condition that the amount of change per unit time of the difference between the prediction data and the actual measurement data is greater than or equal to a predetermined allowable range, or other conditions may be set.
- the present invention relates to whether the water content in oil is really normal under the environmental conditions by comparing the value that should be in a normal state with the value actually measured in terms of the water content in the oil. Is to judge.
- the predetermined condition is not particularly limited as long as it can be determined that the predetermined condition is not normal.
- a plurality of predetermined conditions can be set. For example, when any one of the conditions is satisfied, an alarm is preferably issued.
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Abstract
Description
2 通信ネットワーク
3 環境データ測定装置
4 水分量測定装置
5 水分混入検出システム
Claims (10)
- 油への水分混入を検出するための水分混入検出装置であって、
油の環境データ及び/又は油の周囲環境に関するデータと油中の水分量に関するデータとの相関関係に基づいて、実測された油の環境データ及び/又は油の周囲環境に関するデータから油中の水分量に関する予測データを算出する予測データ算出手段と、
油中の水分量に関する実測データを取得する実測データ取得手段と、
取得した実測データと、算出した予測データとを比較して、実測データと予測データとの関係が所定の条件を満たすか否かを判定する条件判定手段と、
実測データと予測データとの関係が所定の条件を満たすと判定された場合に、所定の条件を満たすことを示す情報を出力する情報出力手段と
を備える、水分混入検出装置。 - 油の周囲環境に関するデータが、油の周囲の所定位置における温度、湿度及び気圧からなる群の少なくとも1つのデータである、請求項1に記載の水分混入検出装置。
- 油中の水分量に関するデータが、油の水分活性値である、請求項1又は2に記載の水分混入検出装置。
- 油の環境データ及び/又は油の周囲環境に関するデータと油中の水分量に関するデータとの相関関係が、実測した油の環境データ及び/又は油の周囲環境に関するデータ、並びに、実測した油中の水分量に関するデータに基づいて、重回帰分析により求められるものである、請求項1~3のいずれかに記載の水分混入検出装置。
- 前記所定の条件が、予測データと実測データの差が所定の許容範囲以上であること、又は、予測データと実測データの差の単位時間あたりの変化量が所定の許容範囲以上であることである、請求項1~4のいずれかに記載の水分混入検出装置。
- 油中の水分量に関する予測データと実測データの差の履歴、又は、予測データと実測データの差の単位時間あたりの変化量の履歴に基づいて、前記許容範囲を特定する許容範囲特定手段と
を備える、請求項5に記載の水分混入検出装置。 - 前記所定の条件を満たすことを示す情報が、警報である、請求項1~6のいずれかに記載の水分混入検出装置。
- コンピュータ装置に油への水分混入の検出を実行させるための水分混入検出プログラムであって、
コンピュータ装置を、
油の環境データ及び/又は油の周囲環境に関するデータと油中の水分量に関するデータとの相関関係に基づいて、実測された油の環境データ及び/又は油の周囲環境に関するデータから油中の水分量に関する予測データを算出する予測データ算出手段、
油中の水分量に関する実測データを取得する実測データ取得手段、
取得した実測データと、算出した予測データとを比較して、実測データと予測データとの関係が所定の条件を満たすか否かを判定する条件判定手段、
実測データと予測データとの関係が所定の条件を満たすと判定された場合に、所定の条件を満たすことを示す情報を出力する情報出力手段
として機能させる、水分混入検出プログラム。 - 油への水分混入を検出する水分混入検出装置において実行される水分混入検出方法であって、
油の環境データ及び/又は油の周囲環境に関するデータと油中の水分量に関するデータとの相関関係に基づいて、実測された油の環境データ及び/又は油の周囲環境に関するデータから油中の水分量に関する予測データを算出し、
油中の水分量に関する実測データを取得し、
取得した実測データと、算出した予測データとを比較して、実測データと予測データとの関係が所定の条件を満たすか否かを判定し、
実測データと予測データとの関係が所定の条件を満たすと判定された場合に、所定の条件を満たすことを示す情報を出力する、
水分混入検出方法。 - 船舶の内燃機関又は外燃機関において利用される潤滑油への水分混入を検出するための水分混入検出装置と、潤滑油中の水分量に関する実測データを測定できる水分量測定装置とを有する水分混入検出システムであって、
水分混入検出装置が、
潤滑油の環境データ及び/又は潤滑油の周囲環境に関するデータと潤滑油中の水分量に関するデータとの相関関係に基づいて、実測された潤滑油の環境データ及び/又は潤滑油の周囲環境に関するデータから潤滑油中の水分量に関する予測データを算出する予測データ算出手段と、
水分量測定装置により測定された、潤滑油中の水分量に関する実測データを取得する実測データ取得手段と、
取得した実測データと、算出した予測データとを比較して、実測データと予測データとの関係が所定の条件を満たすか否かを判定する条件判定手段と、
実測データと予測データとの関係が所定の条件を満たすと判定された場合に、所定の条件を満たすことを示す情報を出力する情報出力手段とを備える、
水分混入検出システム。
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