CN103032166B - Abrasion detection - Google Patents
Abrasion detection Download PDFInfo
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- CN103032166B CN103032166B CN201210517946.6A CN201210517946A CN103032166B CN 103032166 B CN103032166 B CN 103032166B CN 201210517946 A CN201210517946 A CN 201210517946A CN 103032166 B CN103032166 B CN 103032166B
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Abstract
The invention discloses a method for detecting a beforehand abrasion event in a large-scale multi-cylinder two-stroke diesel engine by distinguishing the characteristic temperature fluctuation of the beforehand abrasion event. The temperature fluctuation takes the time interval between the wave crest and the amplitude of the fluctuation as the characteristic. When the beforehand abrasion event is detected, an automatic coping measure is started. The coping measure is terminated automatically.
Description
The divisional application that the application is international filing date is on April 17th, 2008, application number is 200880129198.6, name is called the application for a patent for invention of " abrasion detection ".
Technical field
The present invention relates to a kind of method for detecting the wearing and tearing in large-sized two-stroke diesel engine, particularly relating to a kind of a kind of a kind of method of method for detecting pre-wear condition, method for detecting wear condition and end for detecting wear condition.
Background technique
The operating fault of large-sized two-stroke diesel engine can cause power reduce and cause damage to cylinder and piston.Power loss can be significant, and when motor is had to out of service, this such as can cause very large problem when large-sized two-stroke diesel engine is used as the primary power supply of ocean ship.
Piston ring and all three kind wear mechanisms of cylinder liner surface experience described by Stribeck curve (Fig. 1), this curve makes, and (viscosity, load, speed) is associated with friction factor.These three kinds of mechanism are boundary lubrication, Mixed lubrication and hydrodynamic lubrication.Hydrodynamic lubrication is the situation that surface is separated completely by oil film.If load only part to be carried by oil film pressure and part by with asperity contact and carried, so this situation is called as Mixed lubrication.If whole load is by roughened surface carrying and only isolation is thin molecule oil film, so this situation is called as boundary lubrication.
In large-sized two-stroke diesel engine, boundary lubrication is always present in upper dead center (TDC) around with less degree, and at top dead center, the speed of piston is close to zero.When there is hole polishing (bore polish), the amount of boundary lubrication can rise to the degree of wearing and tearing and will occur.
Due to cylinder lubricating oil be relatively costly and power reduce also be nonconforming, therefore existing reply means are expensive.Therefore, importantly determine whether wear condition has not existed can cancel reply means in time.
Summary of the invention
Our research has shown when boundary lubrication reaches critical value, and the change of friction factor will cause the temperature fluctuation mode of the uniqueness of cylinder liner surface temperature.Before any wearing and tearing occur, the period that this situation will exist between about 10 minutes to 20 minutes.Interim at this time, come manually or automatically to take correct agonistic behavior by alarm system being connected to cylinder oiler system.
When pre-wear condition being detected, cylinder lubricating oil consumption can be increased relative to normal required consumption and occurring to prevent state of wear.Another kind of possibility is electronic control system alarm system being connected to motor, and this electronic control system then can the load of reducing effect on relevant cylinder.Referring to view, this situation is called as " high andfrictional conditions ".If do not take correct measure, the wearing and tearing of heavy wear that this situation will develop into cylinder liner.Cylinder sleeve temperature in wear condition can be stabilized in higher degree.
Within this context, the object of this invention is to provide a kind of method for detecting pre-wear condition.
This object is realized by providing a kind of method for detecting the pre-wear condition in large-scale multi cylinder turbosupercharging two-stroke diesel engine, the method comprises continuously or detects the wall temperature in the upper area of cylinder off and on, determine whether the temperature development of cylinder fluctuates, and separated by the time lag dropped in prespecified range at the crest of the temperature fluctuation of relevant cylinder or trough, and when the temperature difference between the crest of temperature fluctuation and trough exceedes predetermined threshold, send alarm of wearing and tearing in advance.
Our research has shown that the amplitude of time lag between the crest that wall temperature fluctuates or between trough and fluctuation is the most characteristic aspect of pre-wear events.By guaranteeing that the time lag between the crest of temperature fluctuation or trough drops in prespecified range, and by guaranteeing that the temperature difference between crest and trough exceedes predetermined threshold, when false alarm is minimum and the pre-wear events do not given the alarm is minimum, guarantee that reliably sending pre-wearing and tearing alarm when pre-wearing and tearing occur is possible.
Preferably, when the sequence at least with the fluctuation of predetermined quantity occurs, alarm of wearing and tearing in advance is just sent.Thus, the number of times of the pre-wearing and tearing alarm of mistake can be reduced further.
The method also can comprise the degree on the degree of normal operation cylinder lubrication degree being increased to the cylinder be positioned at for giving the alarm for it.These reply means are used for preventing more pre-wear events.
The method also can comprise the degree under the degree of normal operation stand under load degree being reduced to the cylinder be positioned at for giving the alarm for it.These reply means are used for preventing more pre-wear events.
Another object of the present invention is to provide a kind of method for being used in large-scale multi cylinder two-stroke diesel engine, the method is used for having taked to determine when during reply means to return to normal operation after in cylinder being sent to the alarm of pre-wearing and tearing cylinder, the method comprises determines elapsed time interval after reply means start, and after the time lag exceedes predetermined threshold, automatically return to the normal operation of the cylinder sending pre-wearing and tearing alarm for it.
By automatically returning to normal operational condition, the expense be associated with the alarm condition that weares and teares in advance and inconvenience can be kept to minimum degree.
Preferably, little by little perform this and return to normal operation.
Another object of the present invention is to provide a kind of method for detecting the wear condition in large-scale multi cylinder turbosupercharging two-stroke diesel engine, the method comprises continuously or measures the wall temperature in the upper area of cylinder off and on, and exceed predetermined value in the wall temperature of cylinder higher than the mean temperature of other cylinder, or the wall temperature of cylinder is when exceeding predetermined alarm temperature, send the wearing and tearing alarm for cylinder.
By providing a kind of method for detecting wear condition, reply means can be taked to avoid damaging motor further.
Preferably, when the increasing amount of the wall temperature of cylinder occurs with the temperature gradient exceeding predetermined threshold, wearing and tearing alarm is just sent.
The method also can comprise and automatically cylinder lubrication is increased to increase degree from normal degree and the load of relevant cylinder is reduced to reduction degree for giving the alarm for it from normal degree.
Another object of the present invention is to provide a kind of method terminated for the wear events determined in large-scale multi cylinder two-stroke diesel engine, the method comprises continuously or measures the wall temperature in the upper area of cylinder off and on, determine that average cylinder wall temperature that whether wall temperature of cylinder sending wearing and tearing alarm for it exceedes other cylinder is less than the value of given threshold value, or for its wall temperature sending the cylinder of wearing and tearing alarm whether lower than cylinder wall alarm temperature predetermined difference value fixing in advance.
Terminating by automatically detecting wearing and tearing, can take measures to return to normal operational condition, and the expense be associated with the alarm condition that weares and teares in advance and inconvenience can be kept to minimum degree.
Preferably, the method also comprises after determining that wear events terminates the predetermined delay started, and automatically recovers the normal operation of the cylinder sending wearing and tearing alarm for it.
Another object of the present invention is to provide a kind of device to perform a kind of method for detecting the pre-wear condition in large-sized two-stroke diesel engine.This device has at least one temperature transducer for each cylinder in the upper area of cylinder wall, this temperature transducer is connected in processor, this processor is configured to determine whether the temperature development of cylinder fluctuates, and be configured to be separated by the time lag dropped in prespecified range in order to the crest of the temperature fluctuation at relevant cylinder or trough, and when the temperature difference between the crest of temperature fluctuation and trough exceedes predetermined threshold, send alarm of wearing and tearing in advance.
Another object of the present invention is to provide a kind of device to perform a kind of method for returning to normal operational condition after carrying out the reply means relevant to alarm of wearing and tearing in advance, this device has at least one temperature transducer for each cylinder in the upper area of cylinder wall, this temperature transducer is connected in processor, this processor to be configured to determine after reply means start elapsed time interval, and this processor is configured to automatically return to normal operation after exceeding predetermined threshold in the time lag.
Another object of the present invention is to provide a kind of device to perform a kind of method for sending wearing and tearing alarm in large-scale multi cylinder two-stroke diesel engine, this device has at least one temperature transducer for each cylinder in the upper area of cylinder wall, this temperature transducer is connected in processor, this processor is configured in order to when the wall temperature of cylinder exceedes predetermined value higher than the mean temperature of other cylinder, or when the wall temperature of cylinder exceedes predetermined alarm temperature, send the wearing and tearing alarm for cylinder.
Another object of the present invention is to provide a kind of device to perform a kind of method do not existed in large-sized two-stroke diesel engine for the wear condition automatically detecting cylinder, this device has at least one temperature transducer for each cylinder in the upper area of cylinder wall, this temperature transducer is connected in processor, this processor is configured to determine that average cylinder wall temperature that whether wall temperature having sent the cylinder of wearing and tearing alarm for it exceedes other cylinder is less than the value of given threshold value, or for its wall temperature sending the cylinder of wearing and tearing alarm whether lower than cylinder wall alarm temperature predetermined difference value fixing in advance.
To be apparent from detailed description according to the more object of method and apparatus of the present invention, feature, advantage and characteristic.
Accompanying drawing explanation
In the detail section of this specification below, illustrate in greater detail the present invention with reference to illustrative embodiments illustrated in the accompanying drawings, wherein:
Fig. 1 shows the plotted curve of multiple lubrication mechanism;
Fig. 2 is the detailed cross-sectional view at the top of the single cylinder of multiple cylinder engine;
Fig. 3 is the diagram synoptic chart of the cylinder of motor according to the embodiment of the present invention, ejecting system, cylinder lubricating system, temperature sensing system and electronic control system; And
Fig. 4 is the plotted curve of the wall temperature development that cylinder is shown, this temperature development shows pre-wear events.
Embodiment
Fig. 1 shows so-called Stribeck curve.Piston ring and cylinder liner surface experienced by all three kinds of wear mechanisms as this Curves describes, and this curve makes, and (viscosity, load, speed) is associated with friction factor.These three kinds of mechanism are boundary lubrication, Mixed lubrication and hydrodynamic lubrication.Hydrodynamic lubrication is the situation that surface is separated completely by oil film.If load only part to be carried by oil film pressure and part by with asperity contact and carried, so this situation is called as Mixed lubrication.If whole load is by roughened surface carrying and only isolation is thin molecule oil film, so this situation is called as boundary lubrication.
In large-sized two-stroke diesel engine, boundary lubrication is always present in upper dead center (TDC) around with less degree, and at this top dead center, the speed of piston is close to zero.When there is hole polishing, the amount of boundary lubrication can rise to the degree of wearing and tearing and will occur.
The generation of hole polishing is called as pre-wear events in the publication.
Fig. 2 shows one in the cylinder 10 of large-scale multi cylinder two-stroke crosshead diesel engine.Piston 12 moves up and down in this cylinder 10.
The top of cylinder cover by cylinder head 14.This cylinder head 14 is provided with outlet valve 16 and fuel injector 18.
In the region that temperature transducer 20 and the 20 ' movement being arranged on piston 12 are reversed, this region is exactly so-called upper dead center (TDC).Temperature transducer 20,20 ' is arranged in cylinder liner wall and is connected to electronic control system ECS(Fig. 3 of motor via signal cable 22).The wall temperature in the upper area of three-dimensional cylinder measured by temperature transducer 20,20 ', and the signal of temperature transducer is sent to electronic control system by data cable 22.In the embodiment as shown, there are two complete relative temperature transducers 20,20 '.But each cylinder only uses single temperature transducer 20 or each cylinder to use more than two temperature transducers along the circle distribution of cylinder to be possible equally.
Cylinder oiler is imported and exported 26 and is also arranged along the circumference of cylinder.Although the cylinder oiler of other quantity can be used to import and export, be generally each cylinder and three cylinder oilers import and export 26 are set.Import and export 26 by the cylinder oil service pump 24 be associated with each cylinder for cylinder oiler and cylinder oil is provided.Cylinder oil service pump 24 adjusts the consumption of cylinder oil for the operation conditions of motor.At normal operation period, because cylinder oil is relatively costly, therefore consumption is set to be only suitable.This consumption will be subject to the impact of fuel quality, and when using the higher inferior fuel of Sulpher content this consumption by higher and depend on the load of motor and the load of motion speed or specific cylinder.
Fig. 3 shows the motor according to the embodiment of the present invention with five cylinders 10.The quantity of cylinder in the embodiments of the present invention that this is only exemplary can be used in the multi cylinder two-stroke diesel engine of the large-scale cylinder with other quantity any.
The temperature transducer 20,20 ' of each in cylinder 10 is connected to the electronic control system ECS of motor via signal cable 22.The cylinder lubricating pump 24 of each in cylinder 10 also can be connected to electronic control system.Be connected to electronic control system ECS via signal cable 28 and be equally applicable to fuel injection system.
The cylinder wall temperature values provided by the temperature transducer 20,20 ' of cylinder 10 is undertaken measuring and assessing by electronic control system.This electronic control system comprises at least one processor, and this at least one processor is configured in order to measure and to analyze wall temperature signal.The measurement carried out for wall temperature can be interval, such as once per second or continuous print.
Processor analyzes the wall temperature of each in cylinder 10 and the development analyzed about these wall temperatures of the wall temperature of each in cylinder 10.In the cylinder any one demonstrates for pre-wear events when being distinctive temperature development, and processor just sends alarm of wearing and tearing in advance.
Fig. 4 shows the typical pre-wear events succeeded by imaginary wear events (being represented by dotted lines) of No. four cylinders.This pre-wear events starts from wall temperature fluctuation, and the fluctuation of this wall temperature has the fluctuating range in the scope of about 25 DEG C to about 65 DEG C.
The ripple peak-to-peak time lag (or the time lag between trough) of wall temperature fluctuation is usually in the scope of about 6 minutes to about 18 minutes.The period that in Fig. 4, these events occur is referred to as " high andfrictional conditions ".In this condition, frictional force increases but does not increase to the degree of the frictional force occurred during actual wear.
The amplitude range of wall temperature fluctuation can be different because motor is different, can depend on size of engine and design, and can rule of thumb determine.This is also applicable to the scope in the ripple peak-to-peak time lag of temperature fluctuation.
Processor is configured in order to have determined that temperature fluctuation sends alarm of wearing and tearing in advance when meeting the feature of wear events at it.Thus, processor determines whether the ripple peak-to-peak time lag of fluctuating drops in prespecified range and to determine whether temperature fluctuation exceedes predetermined amplitude.
If this determines it is affirmative, so processor just sends alarm of wearing and tearing in advance, and in embodiments, processor also will start pre-wear events reply means automatically.These pre-wear events reply means can comprise the degree on degree cylinder lubricating oil consumption being increased to the cylinder lubricating oil consumption being positioned at normal operation.This increase realizes to the signal that have issued the cylinder lubricating pump 24 of the cylinder of pre-wearing and tearing alarm for it by from electronic control system ECS.Pre-wear events reply means also can comprise reduction for the load on its cylinder given the alarm.These reply means are realized by the amount and/or timing changing fuel injection via corresponding signal cable 28 by electronic control system ECS.Pre-wear events reply means also can comprise reduction engine speed.
Processor is configured in embodiments in order to apply comparatively strict control to the detection of pre-wear events.The form of the continuous print wall temperature fluctuation of extra restriction in the minimum number of times that must occur before giving the alarm.The continuous print fluctuation of minimum number of times can be set to twice or tertiary wave is moved (at least two crests in three crests).
In embodiments, when processor is also configured in order to have taked reply means after send the alarm of pre-wearing and tearing cylinder in cylinder 10, automatically determine when to return to normal operation.In this, elapsed time interval since processor determination self-starting reply means, and the normal operation automatically returning to the cylinder 10 it being sent to pre-wearing and tearing alarm after this time lag exceedes predetermined threshold.Perform gradually and return to normal operation.
If do not take reply means, pre-wear events finally will cause wear condition.The temperature cylinder development of wear events is illustrated by the dotted line of Fig. 4.If wear events occurs (such as because pre-wear events do not detected, or pre-wearing and tearing alarm reply means are unsuitable), so processor is just configured in order to send wearing and tearing alarm when the temperature gradient Δ t/ Δ T of relevant cylinder exceedes the given threshold value shortest time.In addition, if the wall temperature of given cylinder exceedes maximum alarm setting point, wear condition alarm is so just sent.
Processor is configured to detect wear condition to be existed and automatically sends wearing and tearing alarm.In addition, processor is configured to automatically apply reply means in embodiments, such as, be significantly increased to such as at utmost by cylinder lubricating oil consumption when wear events being detected.The fuel that reply means can also comprise by operating relevant cylinder sprays the load reducing the cylinder given the alarm for it.Processor can also be configured to automatically to reduce engine speed and be used as sending the countermeasure after wearing and tearing alarm.
Processor can also be configured to determine when wear events terminates in embodiments.In this case, when the temperature cylinder that processor is configured to the cylinder in order to give the alarm for it is lower than maximum alarm setting point predetermined difference value, cancel wearing and tearing alarm.Processor can also be configured in order to automatically to terminate wearing and tearing reply means after having determined apart from processor the time point predetermined delay that wear events has terminated.Automatically the terminating of wearing and tearing reply means little by little or step by step can be performed by processor.
The present invention has many advantages.It is one or more that different mode of executions or embodiment can produce in following advantages.It should be noted that this is not exhaustive, and other advantage do not described in this may be there is.An advantage of the invention is it provide a kind of reliably for detecting the method for pre-wear events.Another advantage of the present invention is that it is once detect that pre-wear events just starts reply means automatically.Another advantage of the present invention is the reply means that it terminates for pre-wear events automatically.Another advantage of the present invention is that it provides a kind of reliably for detecting the method for wear events.Another advantage of the present invention is that it provides a kind of for once detect that wear events just automatically starts the method for reply means.Another advantage of the present invention is its automatic end detecting wear events.
As in the claims the term that uses " comprise " element or step of not getting rid of other.As in the claims the term "a" or "an" that uses do not get rid of multiple.
Although cause for the attention being considered to the feature of particular importance of the present invention in aforementioned explanation as possible; but should be understood that; whether claimant is claimed about the combination with reference to accompanying drawing or any feature of patenting illustrated in the accompanying drawings or feature, no matter and to this has been lay special stress on.In addition, it is to be appreciated that those skilled in the art can modify to its device and/or improve in consideration situation of the present disclosure, and they still remain on as in claims in the scope of its scope and spirit set forth.
Claims (4)
1., for detecting a method for the pre-wear condition in large-scale multi cylinder turbosupercharging two-stroke diesel engine, described method comprises:
Measure the wall temperature in the upper area of described cylinder continuously or off and on,
Determine whether the temperature development of cylinder fluctuates, and
The time lag between the crest of the temperature fluctuation of relevant described cylinder or trough were by 6 minutes to 18 minutes separates, and when the temperature difference between the described crest of described temperature fluctuation and described trough is in the scope of 25 DEG C to 65 DEG C, send alarm of wearing and tearing in advance, and
Cylinder lubrication degree is increased to the normal operation of the described cylinder for sending described alarm for it at utmost.
2. method according to claim 1, wherein, when the sequence at least with the described fluctuation of predetermined quantity occurs, sends alarm of wearing and tearing in advance.
3. method according to claim 1 and 2, described method also comprises the degree under the degree of normal operation stand under load degree being reduced to the cylinder be positioned at for sending described alarm for it.
4. one kind for detecting the device of the pre-wear condition in large-scale multi cylinder turbosupercharging two-stroke diesel engine, described device has at least one temperature transducer for each cylinder in the upper area of cylinder wall, described temperature transducer is connected in processor, described processor is configured to determine whether the temperature development of cylinder fluctuates, and be configured to separate in order to the time lag between the crest of the temperature fluctuation at relevant described cylinder or trough 6 minutes to 18 minutes, and when the temperature difference between the described crest of described temperature fluctuation and described trough is in the scope of 25 DEG C to 65 DEG C, send alarm of wearing and tearing in advance, described processor is also configured to cylinder lubricating oil consumption to be increased to described cylinder for sending described alarm for it at utmost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210517946.6A CN103032166B (en) | 2008-04-17 | 2008-04-17 | Abrasion detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210517946.6A CN103032166B (en) | 2008-04-17 | 2008-04-17 | Abrasion detection |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801291986A Division CN102027219B (en) | 2008-04-17 | 2008-04-17 | Scuffing detection |
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| CN103032166A CN103032166A (en) | 2013-04-10 |
| CN103032166B true CN103032166B (en) | 2015-04-22 |
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| CN108919739B (en) * | 2018-07-25 | 2020-08-21 | 嘉兴市合一工业电炉有限公司 | Industrial electric furnace control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4018639A1 (en) * | 1990-06-11 | 1991-12-12 | Motoren Werke Mannheim Ag | Monitoring IC engine w.r.t. rate of temp. change - processing temp. measurements at intervals for prodn. of alarm signal or shut=down of engine |
| JPH0626393A (en) * | 1992-02-26 | 1994-02-01 | Diesel United:Kk | Wear detection device for cylinder |
| JPH0783090A (en) * | 1993-09-13 | 1995-03-28 | Yamaha Motor Co Ltd | Drive control device of two-cycle engine |
| DK0652426T3 (en) * | 1993-11-09 | 1998-10-26 | Wortsilo Nsd Schweiz Ag | Procedure for identifying diffraction disturbances in diesel engines |
| JP2002021629A (en) * | 2000-07-06 | 2002-01-23 | Mitsubishi Heavy Ind Ltd | Abnormality detection device for cylinder liner |
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Address after: Copenhagen, Denmark Patentee after: Mannone solutions (mannone solutions Germany) branch Address before: Copenhagen, Denmark Patentee before: Mann Diesel & Turbine, an associate company of Mann Diesel & Turbine Europe AG |
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