DK181049B1 - System and method for examining cylinder liner, holding tool for imaging device, and cylinder liner - Google Patents

Abstract

The present invention provides a meansfor easilyand accuxately evaluating the state of wear of anengine cylinder liner. After a maintenance worker places an imaging device 14 on the upper surface of a piston 54, the piston 54 is caused to move back and forth once within the cylinder 51. While the piston 54 is moving back and forth once, on the basis of crank angle data transmitted from a crank angle measurement device 8, a terminal device 11 transmits command data to the imaging device 14 when the imaging device 14 reaches a preseribed position in themovement direction of the piston 54. The imaging device 14 images the inside surface of the cylinder liner 53 and a flame-contact surface of a cylinder cover 52 in accordance with the command data and transmits generatedimage data to the terminal device 11.

Description

DK 181049 B1 1 Fhechuden) Fiold] feo The present invention pertains to a technigue for examining the cylinder liner of an BREE.

[Background Art] fonog As maintenance work for a large engine such as an engine mounted on a large ship, thestate of weer of the cylinder liner is determined.

HOS & method af dirgetly viswing or inæuring the inside: surface of & evlinder liner by means of a maintenante worker entering the cylinder ia known as a method for confirming the state of wear of 2 cylinder liner: 9004] Moreover, & method of imaging the inside surface of a cylinder liner by using av imaging device inserted by a malntensnce worker into the cylinder via a scavenging port provided to the cylinder is known as another method for coufinming the state of wear of the evlinder liner foul Document I is an example of a Sonmunt that discloses a terhmæs for confirming the stafe of wear of an engine component. Patent document I discloses a tøchnigve for coating a piston using a costing material having a color different from that of the piston main body so ds bo cover the process grooves generated when processing the piaten of smengine, driving the engine using the piston that has been coated, and then removing the piston from the eylinder of the engine, imaging the side surface of the piston using an imaging device, and specifying the wear of the piston based on the clarity of the image obtained by the imaging. [Prior Art Document! [Patent Document] locos) [Patent Detument 11 JP 8247724 Outline of the Invention] [Problem to be Solved by the Invention] foot To carey out a method for direetlv viewing or imaging the inside stofare of a ovlinder liner by means of a malotenance worker entering the svlinder (bereafter refersed to ag

DK 181049 B1 2

“direct approach method”), it is necessary to open the cylinder cover, which requires g signifies amount of time and effort.

Accordingly, it js mneffigient to carey but: the direct sppronch method frequently.

Moreover, a maintenance worker is not able to enter the evlinder immediately after operation of the engine has stopped, sive the temperature inside the evlinder is high.

Accordingly, the direct approach method carnot he carried out until the made af the evlinder has oooled down, thus prolonging the operation, The divest approach method requires a maintenance warker to mount and distount a chalr inside the evlinder imposing a physical burden and increasing the risk of uveident, [oops

Meanwhile, whan wing a method før imaging the inside surface of 2 cylinder liner by site an. imaging device inserted vin a scavenging port hereafter referred to ax "Hrd imaging method”), a clear image vannot be obtained in the vicinity of the top of the cylinder, which ie far away from the scavenging port.

Usually, since waar of a ovlinder lng ix mors advanced in the vicinity af the top of the eylindar than in the vicinity of the bottom of the eylinder, fo evaluate the state of wear of a cylinder hiner sulficiently a elesr image of not only the vicinity of the hottie of the cylinder hut also the vicinity of the top of the eylinder is required.

Accordingly, according to the Burd imaging method in which a dear image of the vicinity of the top of the eylinder cannot be obtained, the state of wear of a evlinder liner cannot be sufficiently evaluated, fon0s

Moreover, with either the direct approach method. op the fixed imaging method, verifying the posthions frem images of the same cylinder Boer captured at different timings is complicated.

Aceordingly, change tn the state of wear in aospeafie region of the cylinder liner cannot he bas obtained. neo

In view of the aboverdeseribed matter, the purpose of the present invention 18 to provide 8 means that enables easy and scourate evaluation of the state of wear of a evlinder lines. [Menns for Solving the Problem] font

To solve the shove described problem, the present invention provides a system for examining a cylinder liner, comprising an bnaging means that & configured sous to be tuf ble of boing disposed on the upper suyfaes of the platen of an engine, said maging meshs imaging the inside surface of s cylinder liner that covers the inside surface of a cylinder that accommodates the msten and generating eyhnder hose image data indicating the captured mage, and 3 posifion data scuosition means for doguating position. data indicating the position of tha bridge menne inthe movement dissection of the piston,

DK 181049 B1 3 faa

A eonfiguratin may also be adopted whorein the above-described svatejn comprises sn mitrueting means for instructing imaging to the imaging means when the position dats indiceatér a predetermined position, the måling means porformurg unsving necerdise to the instructions from the instructing means. foerst

Å configuration may also be adopted wherein, in the shovedeseribed system, the prssition duta acquisition means acquires erank angle date indicather a crank angle pertaining to the piston and øenerates the positiom dats using the evank angle data. ged

Acconfipuration may also be adopted whersio the above descethed system vomprises ranger finding: means that is configured so as to be capable of being disposed on the upper surface af the piston, såld range-finding means mensinming: the distance betwesn the upper surface of the piston and the flame contact surface of & eylinder cover positioned at the top af the oylinder and generating movement direction distance data indicating the measured distance, wherein the position dada avguisition means generates the position data using the movsment direbtlon distin dati 0018]

A configuration may also be adopted wherein, in the sboverdesoribed system, the imaging weans Images the flame contact surfaes of the evlinder cover positioned at the top of the gylinder and generates fhonecontat surfece image date indicating the captured image, and the position data semistbøn means generates the position data using the Samereontact surface nage dats, fonte

A configuration may alse be adopted wherein, in the above-described system, the position data scontisition meas generates the position data using the evBnuder Huer mage data. for

Avonfiguration may also be adopted wherem the above-desaribed system comprises a divection døta acquasibion menn» that sacguirss divection data indicating the imaging direction hy the imaging mrans. fois]

A configuration may alse be adopted wherein, in the above-described system, the imaging weans images the Mamescontach surface of the eylinder cover positioned at the top of the cylinder snd generates flame sontact surface msg data ndisating the captured Image, and the direction tlatå acqilosition means genemites the divection data. wang the Samer sontaet surface Sav HE data.

DK 181049 B1 4 fg gl A configuration may alko be adopted whoran, in the åbove-dencnbod svelem, the direction data acquisition means generates the direction dats using the oyvlinder liner image data.

[0201 A eomfiguration may alse be adopted wherein, in the above described system, the HAE megnes miesstires the distance from the imaging means to an imaging sublevt sød generates imaging distance data imfieating: the measured distance, said system comprising & correetion means for correcting the eyDnder liner image data usine the imaging distance dati. ioog1] A configuration may also be adopted whersin. in the abøvedesonbed system, the imaging means images the lame contact surface of the cylinder cover positioned at the top of the erlinder and generates flameontaet surface mags data muboating the captanad image, said system comprising & correction means for correcting the cylinder liner image data using the Hame-contact surface image datø. tne A conbguration møvalse be adopted wherein the sboverdesaribed sratem comprises & wesrspecifving means for spøeifving the extent of wear of the evlinder One using the cylinder liner image data and generating wear data. indicating the specified extent of wear. fou 3} A ronfiguration may also be adopted whervin, in the sbovesdesceribed system, the imaging means senerates evlinder liner image data pertaining to each of a plurality of eviinders of the same type provided by avenging punted on one ship oe cach of sg pluralty of ships of the same type. ssid system somprising aftribute data acquisition means for geguiring attribute data indicating attributes of navigations performed in the past by the one ship or the plurality of clips af the some type, esid attributes inflnencing the wear of the eyvlinder liner, and a relationship data generation means for generating relationship data mdieating the relationship betwen the attributes and the extent of wear of the eyhnder liner using the wear data and the attribute data, fog A ronfiguration may also he adopted whersin, in the shove desceibed system, the imaging means generates øylinder liner image data perliining tog eylindér provided by an engine mounted on a ship, said system comprising an attribute data arguisition means for acquiring aftribute data indicating attributes of navigations performed by the ship, sald attributes influencing the wear of the evlinder liner, and 2 weary sstimation means for celimating the extend of wear of the evlinder Bner using the sttybute data and the relationship data and generating estimatød wear data indioating ths estimated sxtent of

DK 181049 B1

Wea inoas]

Avonfiguration may also be adopted wherein the shove described grstem comprises & notification means for providing to sa user predutermingd noufieattons if the difference between the extent of wear indicated by the estimated wear data generated by the wear estimation means and the extent of wear indicated by the wear data generated by the wear spectiving means pertaining to the svlinder liner ab + certain timing satisfies predetermined conditions. jones

A configuration may also be adopted whersin, in the aboverdesoribed system, the imaging mesns generates ovlinder liner image data for each of a plurality of oylinders of the same type, satd system comprising an evaluation data acquisition means for acquiring the evlinder liner image data generated hy tha imaging means and evaluation data indeating an evaluation pertaining to the state of the vylinder liner based on the image indicated by the eylinder liner image data, and an extraction means for extracting, from among a plurality of items of evaluation data acquired by the evaluation data acquisition means, evaluation data corresponding to sylinder Ener image data indicating predetermined almilaritics betweorn evlinder liner image data specified by a user. fool

A configuration may also be adopted wherein, in the above-described system, the imaging means generates cylinder liner image data pertaining ta a cylinder provided by an engine mounted on a ship, seid system comprising an aftribute data avnusttien nisans for seguiring attribute data indivating attrihutes of navigation performed in the past by the ship, sand sn extrsetion means for extracting aftribute data that satisfies predeternined conditions corresponding to damage fram among a plurality of tems of atfrihute data acmired by the attribute data soguition means when an image shown br the ovlinder Hner image dats generated by the imaging means indicates damage to the evlinder liner, orgel

The present invention provides a method for examining.& évlinder liner, eomprising it step in which the piston of an engine having an imaging device provided at an upper surface thereof moves within the cylinder that sccommedates the piston, and a step in which the raging device linhges the inside surface of the vylinder liner that overs thie inkide surfage of the cylinder while the piston is moving within the evlinder or after the piston has Brished moving within the cylinder. vvs

The present invention provides a holding tool that is configured so as to be capable of being disposed on the ufrer surface of the platoniof an snøtne, sold. holding tool Kølding an

DK 181049 B1 6 imaging device that images the inirde surface of a cylinder hoer that covers the inside surface of a cylinder that åcoommaodater the piston while obstructing the transfer of heat from the piston to the imaging device. 10030} A cemflguration may alse be adopted wherein the shove described holding tool has an elaatic body disposed between the upper surface of the piston and the vnaging device. ona A omnfigurstion may also be udepted wherein the abeve-desuribed: holiing tosl has characters, svinbnls, or drawings indientine the direction of imaging hy the imaging device wn the imaging region of the imaging device. inaasl A configuration may alen be adopted wherein the shove described holding tool has lege that support the imsging device in x state of being separated from the upper surface of the piston. or A configuration may alse be adopted wherein the above-described holding tool has red-like body that iø inserted info s resces provided st the upper surface. of the piston.

0034] A configuration may also be adopted wherein the above described holding tool has a contact suclace having a shape that engages with the shape of the upper surface of the piston. foes The preset invention provides a eylinder liner of an engine, having an inside upon which a pattern oceurs, ab least one of the size, shape, and direction of said pattern changing seceding to the degreaof woesy

HUSE Avonfigorstion may also he adopted wherein the shoverdeseribed uyvlinder Tner has recessed portions on the inside surfare, at least one of the size, shape, and direction of said recessed portion changing in the radial direetion of the evlindér: 037d A configuration may alse he adopted wherein, in the above-described oylinder liner the recessed portions ave filled with a material having a color different to that of the main bods. oss A configuration may alse be adopted wherein, in the aboverdeseribed evlinder liner, & pattern some in sg plurality of positions. the crmamferentisl direction af the ovbmder. fuss Å configuration may also be adopted wherein, irt the abaverdeserbed cylinder liner, x

DK 181049 B1 7 pattern occurs in & plurality of positions in the movement divection of the piston. i0040}

A configuration nay also be: adopted wherein, in the shove described evlnder liner, & different patton scars in cach of nr plurality of positions, [EB ifactz of the Invention] ons]

According to the present mvention, a clear image of the inside surface of a evlinder Hiner van be øbtained without the need for a maintesanve worker to open the eylinder cover or in enter the ovlinder As = result. the malntenanes worker is able easily and accuratelv to evaluate the state of waar of thevvlinder liner. [Brief Explanation of the Drawings! foal (Rig. 1 Fig. 1 ie a drawing lusteating the overall configuration of a eylinder liner examination system according to the first embodiment, (Fig. 2] Fig. 2 ie: a drawing Slustrating a terminal device and imaging device seoording to the first embodiment; and devives related thereto Pig. 2) Fig) 3 is a drawing ilustrating the basic configuration of øn imaging device according to the frst embodiment.

Fig: 4) Fig, 4 is a drawing exemplifyving the positions of recessed portions provided by the evhinder liner aveording to the Arstembodiment. (Fig.

SI Fig. 5 is o drawing illustrating the shape of the recessed portions provided by the ey hander liner according to the Rest embodiment, Fig. 8) Fle, 6 tea drawing Ulustrating an mags captured by the imaging device according to the frat embodiment, He: 71 Fig Tin a drawing illustrating the baste configuration of a computer adopted as the hardware of a terminal device socording to the fivst embodiment, Fig, 8] Fig 3 is 2 drawing illustrating the baste configuration of a computer adopted as the hardware of a server device actording to the Arst embodiment, Fig. af Fig. 9 is a drawing ilustrating the functional configuration of the terminal device svcordingr fo the frat embodinett.

Fig. 10) Fie. 10 is a drawing exemplifying the data configuration of a wear management database stored in the terminsl device according to the first embodiment. (Fig. 11] Fig. 11 is a drawing exemplifying the data configuration of an engine attribute database stored in the terminal device according to the first smbodiment. [Fig 19 Fig. 12 is a drawing exemplifying the data emfiguration.of a metsorologten marine database stored in the torminal devices sascørding: to the rad smbodiment.

Fig. 18] Fie 13 je a drawing exemplifving the data configuration of a navigation schedule

DK 181049 B1 8 table stored in the terannal device aecording to the first earbodizaent.

Fig 14] Fig: 14 ix sa drnwing Mustrating the functional senfiguration of the server devise secording to the first embodiment, Pig, 18) Fig, 18 1s a drawing exemplifying a warning sovsen displayed on the terminal desice according to the first embodiment. (Fig. 16] Fig: 16 is a drawing exemplifying an imageviewing screen displayed on the terminal device secording to the first embodiment.

Fig: 17) Fig, 17 je a drawing exemplifving the imagervimwing szoreen displayed on the terminal devise according te the first embodiment. [Fig 18] Fig. 18 la a drawing exemplifving a deterioration viewing scesen displayed on the terminal device argording- to the freak srbodinvent. (Fig. 19] Fig, 19 is 2 drawing exemplifying an uneven wear verification screen displayed on the ferminal device aræomlitur to the first embodiment.

Fig. 20) Fig. 20 is a drawing exemplifying the external appearance of the nnaging device according ton modified example, Fig, 21) Fie, 81 is a drawing exempåifving the position uf a recessed portion provided by the evhuder liner atverding fo a modified example. (Fig: 29) Fig 22 is a drawing illustrating a state in which the holding tool according to a modified example is placed on the upper surface of the piston.

Fig. 23) Fie, 23 is a drawing ilustrafing a state in which the holding teal amording to os modified example is attached to the upper surface of the pistorn, Fig: 241 Vig. 24 is a dreoving esemplifsing a temporal change viewing sereen displaved on the terminal device according to a modified example, (Fig. 28) Fie. 25 is a drawing exemplifying the data configuration af a maintenance work database støred in the terminal device according to a modified example. (Fig: 26] Fig. 28 is a drawing illustrating the data configuration of a used fuel oil database stoved in the terminal devise according to & modified example. (Fig. 27) Fig. 97 is a drawing oxemplifying & screen displayed on the terminal devive aocording to a modified éxample. (Fig, 28] Fig 28 is s drawing exemplifying a screen displayed on the terminal device according to a modified example.

Fig. 281 Fig, 29 is + drawing exemplifying a screen displayed on the terminal device secording to a modified exampli, Embodiment! fo03 Lo Configuration

Fig. 1 3s a drawing Ulustrating the overall configuration of & erlinder liner

DK 181049 B1 9 sxaminatloh system 1 according to the present ennbodimant, Cylinder liner examination system I is a system for supporting examination of a eylinder liner that covers the instile surface of the cylinder of an engine mounted on a ship. od

Cylinder liner sxamination system 1 comprises a terminal device 11 disposed on a ship 5, aiserver device 12'that performs data communication with terminal device 11 vid a communication satellite 6, and 8 server devies 18 that delivers, to server devien 12, metoorolugiesl/mæmeine data indlegting meteorological and marine conditions ship & ancounters thing navigation.

Fie.

I illustrates one ship 5 avd one terminal device 11, but the numbers thereof are not limited fo ons. in0as

In addition to terminal device 11, an imaging device 14 that constitutes cylinder liner esamination system I in mounted um ship 5. Fig: 2 18 a drawing Ulusfrating terminal device 11 and imaging device 14 mounted on ship 5, and devices related to fermmal device 11 sand imaging device 14. tent

Ship S comprises a plurality of engines (drawing smitted). Ad engine usually has o plurality of cylinders 51, and fig. 2 exemplifies one of a plurality of evinders 31. The top of cylinder 51 3s open, ad is usually covered by a cylinder cover 52. A large portion of the inside surface of cylinder 51 is eovered by evlinder liner 53. A piston 34 is accommodated in cylinder 51, and piston 54 moves reciprocally inside eylinder 51 in accordance with the operation of the engine.

Hereafter. the movement divection of piston 54 is simply referred to as "movement direction.” Morcover, the sircumferential direction of eylinder 51 or eyliuder cover 52 is simply referred to as "eireumferential direstion.” oa

Cylinder ner 8% serves to Jorrkase.

Shdsbiltty of the reciprora] movement of ston 54, transfer the hent of the engine to promote cooling, increase the abrtighiness of eylinder 31, and the hke.

The inside surface of cylinder liner 88 causes abrasion in aceordance with the reciprocal movement of piston 54, but the life of the engine can be extended by changing the gyhnder liner,

0048]

Cylinder 51 ja provided so that & plurality of scavenging ports 511 pass through the side surface of piston 54, said scavenging porte 511 being arranged in the ehreumierential divection, for example.

Ås Wustrated in fig, 2, scavenging port 511 is disposed in a position close ta the bottom of evlinder 51. However: in a state iu which piston 54 has sufficently moved to the bottom side inside eylinder 51, scavenging ports 511 ave positionsd so as to be above the upper sunluve (for example, top surface) of piston 54, Hersafter, the position of

DK 181049 B1 piston 54 ilustrated in fig. 2 is reforred to as “basic position.” In the present application, when raferting to the top/bettom of ålinder 51 or piston 54, the Same contact mirfacé Side ja the top side.

[0048] In fig 2, imaging device 14 is sonlimred so as to be capable of being positioned on the upper surface of piston 54 via holding tool 7. Fig. 3 is a drawing illustrating the basic configuration of an imaging devies 14, Imaging device 14 comprises an imaging unit 141, a Hght-emitting unit 142 that shines light on a subject during lmmaging, a contro] unit 143 that controls the imaging by imaging wad 141 and shining of light by hahtemitting unit 148, a receiving anit 144 thai receives command data for commanding an image from an external device, a gtorsge unit 148 that stores image data indieating captured images. and a transmission unit 148 that transmits the image data to an external device, fos} Imaging urt 141 generates image data indicating a seamless panorama image that eovers the entive region of a hemisphere by a single capture. That is, when imaging device 14 is disposed in the direction mdicated in fig. 2, the imaging region of imaging: urdt 141 becomes the entire region above the upper surface of piston 84. fos Receiving wih 144 receives conupand data fron ferninal device 11 via a wireless secens point Glrawine omitterD, for example, and delivers the command data to control unit LÆS, Control unit 143. causes imaging unit 341 to perform: imaging and simultaneously causes høktemitting unit 149 to emt light, according to the command data. Since imaging in cylinder liner examination system 1 is constantly accompanied by emission of light hy Kghtemitting unit 142, hereafter, the ferm “imaging” simply stønifles imaging accompanied by emission of light by hghtremitting wnt 142. Image data generated by imaging performed by 1magingvunit 141 is stored in storage unit 145 and transmitted fo terminal device 11 by transmission unit 146; lonse Images captured by imaging devise 14 include an image of the mmde surface of svinder 33, and an image of the bottom surface ofevlinder cover 52, that is, an image of the flamewontact surface. Hereafter, of the images generated by imaging device 14, the portion indicating an image of the inside surface of cylinder liner 33 is referred to as "cylinder liner image data,” ond the portion indicating an image of the fame-eontact surface of oylinder vover 52 js referred to as “Hamer contact surface image data” 0053 Holding tool 7 18 formed from rubber, for example, and provides høst vesistance, thermal ineulation: properties, mod low heat teander properties, Holding tool 7 has three år

DK 181049 B1 11 mere legs, and supports imaging device 14 in a state of being separated from the supper surface of piston 54 The contant suefges betwen haoldinig tool 7 and pastor 54 ta smalt Therefore, the heat frem piston 54 does not easily transfer to imaging device 14, Since holding tool 7 hus high elnstlelte, piston 54 and imnøme device 14 ase not cantly damaged even when handled varelessly by a maintenance worker, Holding tool 7 does nat nerd to be formed entirely of rubber, and a sonfigtrafion tr which a metallic frame 18 seated with robber, for example, way be adopted, Another material may be used for holding tool 7 in. place of rubber as long as the material provides hest resistorve, thermal iosulution properties, awd low heat transfer properties.

0054] When examining ovlinder liner 53: a røsintenance worker stops the engine, operates the control device of the motor, and moves piston 84 to the hasic position. Then, the maintenance worker sets maging device 14 on holding tos! 7, and subseguentiv inseria imaging deviee 14 into cylinder 81 via a scavenging port 311 by use of a grabbing tool, for svample, and places imaging device 14 in the central position on the upper surface of piston 54, When doing so, the maintenance worker aligns the direction of imaging device: 14 with a predetermined devotion. fons] Then, the waintsnance warker operates the control device of the wetor and moves piston St back and forth once within ovlinder 51. During this time, imaging device 14 performs imaging according to the command data transmitted from terminal device 11, and transniits the generated image data fo terminal device 11. nose Then, the maintenance worker removes imaging device 14. set on holding tool 7, from cylinder &1 via one of the scavenging ports 311 by use of a grabbing tool, for example: Accordingly. a clear image of the inside surface of ovlinder Boer 53, Imaged in a plurality of positions in the movement divection, can be obtained. fos] While piston 54 is being minved back and forth once as described above, terminal device 11 receives image data transinitted from imagmg device 14 and crank angle data pertaining to piston 54 transmitted from a crank angle measurement device.8. Crank angle measurement device 8 continuously messives the crank angle, and outputs crank angle data indicating the measured ermnk angles. Crank angle data received hy terminal device 11 ia used to generate position data indicating the position of imaging device 14, toss In addition to ofank angle measurement device 8, a measurement device that measures various sttribertes of navigation performed by ship 5 is mounted øn ghap 5

DK 181049 B1 12

Hereafter, as indicated in fg 2, the collection of these medsurement døvives 18 referred tomas a prety of mensurement devices 9. Group of misseureinent devices 9 waludes, ad measurement devices that measure attributes that affect the wear of cylinder linér 53 devices that medsure tngine attributes such as an engine rotation speed mengsurcmernt device 21 and an engine load measurement device 92, devices that measure attribmter pertaining to metdorclogical/marineg conditions such ws wind speediwind direction weasurement device 93 and tide spredftide direction measurement device 84, desisøs that mengsure attributes pertaining to ship speed such as & groundepeed palondution device 85 and a log speed ealonlation device 96, and the like, for sxample.

Measurement divess inehuded in group of modsurement devices § transmit afteibute data indicating messuret attributes to terminal devise 11. Each fepe of atfritnste data: received hy terminal device 11 38 used to estimate the degree of wear of cylinder liner 53, and the like, oss

Cylinder imer examination system 1 comprises a function for specifinng the degree of wear of cylinder liner 53 using image data generated by imaging devies 14. To specify the degree of wear using mage data, a large munber of conical recessed portions 881 having the radial direction of eylinder liner 53 as the rotational axis åre provided on the inside surface of evlnder line 83 in the present embodiment.

Fig, 4 is a drawing illustrating the positions of recessed porhons 531 provided to cylinder Busy 53 as "O." fous

In the example’ shown in fg, 4, recessed portions H31 ars arranged on. the intersections bebwesn four straight Hines along the movement direction arranged in positions that are seb apart from each other by 90 degrees in the etrcuraforsntial direction of vylinder liner 53, and six Knes (eirøles) arranged in the ctreumferential direction at equal intervals in the movement direchon.

However, the nåmber of recessad portions 531 and intervals thereot are not limited to-thove exemplified in fe. 4, and ore determined, ag averopriste. fran the sæ of cylinder liner 43 and the like. fond

Ås illustrated in fig. 5, each of recessed portions 531 hes a conical shape in which the digester decreases from the inside surface towards the outside surface of cylinder liner 53, Accordingly, the diameters of the openinge of recessed portions 531 become smaller aa the wear of cylinder diner 33 advances: Therefore, the degree of wear af cylinder liner 53 is gecurately sperified. based on the diameters of the recessed portions 331 in the images thereof indicated by the image data generated by imaging device 14. os

Fig, 618 a drawing schematically Hlustrating images of cylinder hiner 58 -vaptured by imaging device 14, wherein a røgiæ adjacent to the upper surface of piston 54 during

DK 181049 B1 13 imaging (region in which the image is clear) ig cut out in a støip shape, and wherein an image of the Same contact surface le out out. Fig. 8(a) Ulustrates an hage soptured by imaging dåvice 14 in the visinity of the bottom of the eylinder, fig. 606) illustrates an image captured by imaging device 14 in the vicinits of the mid'gestion af ovlinder 51, and fg. 8 Hlustrates sn image captured by imaging device 14 in the vicinity of the top af sylinder 31. Ax Hlustosated an fig, 6, the eloser the imaging position is to the top of cylinder 51, the greater the image of the fame eontac surface 18.

FOR) The hardware configuration of terminal device 11 i8 a general computer for = terminal device, for sxample. Fig, 7 is a drawing ilustrating the basic configuration of a somputer 10 adopted as the hardware of terminal device 11. Computer 10 comprises #2 memory 101 that stores various types of date, a processor 102 that performs various types of data processing according to a program stored in memory 181, 8 somimunication interior 103, wihueh is an mterfaee that performs dats communication with other devices, an display deviga 104, such &» a hquid ervstal display, that displays images to s user, and an operation Jever 105, such as a kevboard, that receives an input operation by a user, An external display device that is connested fo computer 10 may be used in place of or in addition ta display device 104 that is built into computer 10. Moreover, an external operation device that is connected to computer 10 may be used in place of or in addition to operation device 105 thabis built into computer 10. one) The hardware configuration of server devies 12 and server device 18 is a general computer for a server device, for example. Fig, & is a drawing Hlustrating the. basic sonfignration of a computer 20 adopted as the hardware of server device 12 or server device

13. Computer 20 comprises a memory 201 that stores various types of data, a provessor 208 that performs varius types of data proscssing secording to a program stored in memory 201, and a communication interface 203 that performa data communication with other devices.

OGS Fig. 9 is & drawing illustrating the functional configuration of terminal devise FL, That is, computer 10 operates as a device comprising the configuration ilustrated in fig, 9 by performing data processing acvording to a program fur terminal device 11. Following is an explanation of the fonctional configuration provided by terminal device 11: loose A fining means 110 generates time data indicating a current time. & position data aequistioey wena 111 reseivesorank angle dats from crank angle measurement device Sand reheratos postion data indicatiug the position of imaging device in the niovement direction vsink tha omk snobs data,

DK 181049 B1 14 fos

Position data sægusttion means 111 spénfes the position of imaging device 14 in the movement divection corresponding to the erank angle, that is. the position of the upper surfoee of piston 54. by using a predetermined ealandation formule or conversion table that uses the crank angle indicated by the crank angle data ay a variable, for example.

Since the position of imaging device 14 is uniquely determined by the erank angle, the crank angle data may be goad as is, as posltiov dat fate]

Command weans 118 fransmits, ta imaging devices 14, commas? data instrueting imaging, when the position data seguired by position data sequisition means 111 indicates 8 predetermined pøsitiøn.

The position. of imaging device 14 at which command mens transmits command data is determined as. s position such. as that in which the entirety of evlinder Boer 53 is covered when the portions; of images saptured by imaging device 14 in those positions, in which evlinder liner 58 is clearly imaged, are cut out in strip shapes, distortions are corrected, and the strips are joined together in order, Image data soguisitton means. 118 recetves image data bransmitted from imaging device 14. oven

Attribute data acquisition nivans 114 receives attribute data from wach of the measurement devices included in group of messurement devices 9. Athiihute data acquisition means 114 acquires attribute data input by 8 maintenance worker or the like, and receiver attribute data transmitted from server device 12. The attrjbute data input by a maintenance wicker of the Bhe is date indicating »itributes that åre not messursd by group of mensurement devices 9 of the attributes af navigation of ship 5. such as the type of feel oil used. im the engine, Atirthute data transmitted from server device 12 ia meteordløsicalmatine data niudivebog mettorolostenl ér marine conditions predicted to be encountered by ship 5 during future navigations, for example, ioe7Ol

Wearspeoifving means 115 spéefies the degree of wear of cylinder hiner 53 using image data acquired hy image date semtsition means 113, and generates wear data indicating the specified degree of wear: In the present smbødiment, the thivkness (um) of wear from the initial state of eylinder Nner 53 is used as an indicator that represents the degree of wear of cylinder liner 53. Hereafter, this thickness 1s referred to as "wear amount” The thickness of wear from the initial state of evlinder liner 53 is one exambdle of an indicator that represents the degree of wear of cylinder liver 83, and one of various other indicators may be adopted ag sn indtentør that represents the degree of wear of cylinder Buer 58. For skample sn indicator such as the weight (e/m 2) of worn material per unit surface area of the inside surfave of ovlinder liner 55; the wear amount lum/kW) per unit Joad, the wear amount

DK 181049 B1 huntime) per unit navigation time, of the like may be used as an indicator that epresents the degree of wes of vplinder Bnov 53. Der Transmission means 116 transmoits, fø server device 12, attribute data negulred by attribute data nomnisttion means 114, and wear data generated hy wear specifying means

115. Relationship data acquisition means 117 recemves, from server devies 12, relationship data indicating the relationship be tween attributes pertaining to navigation of ship 5 and the wear amount of cylinder ner 58.

[0672 Wear estimation means 118 estimates the wear amour of ovlinder liner 83 hy using the aftribute data acquired by atieibude data acnusition means 114 and the relationship data acquired by relationship data scoujsition means 117, and generates estimated wear data indicating the wctimated wear amount (hereafter refirred tn as “estimated wear amount”), foal Notiftabjon means 119 pørforms & predetermined notification fo a maintenance worker or the lke when the difference between the selimated wor omount indicated by estimated wear data generated by wear estimation means 118 and the wear amount indicated hy wear data generated by wep speciiving means 115 with respect to eyBader liner 85 ata given timing satisfies predetermined conditions.

[nT 4} Storage means 120 stores various types of data, as Indicated below. Fie. 10 sa drawing exemplifving the data configuration of a wear management datgbase stored. in storage means 190. The wear managenient database ie 4 database for managing the wear amount specified primanily from images vantured by intaging device 14.

0075] The wear management database includes a data table perinining to each of the eylinders 51 provided ta an engine mounted on ship & The data table of the wenr management database is a dullestion of data records pertsining to each of the images captured by imaging device 14. The data table the wear management database has the following Sells (names of fields are shown in square brackets) [imaging time] that stores tims data indicating the mapture times of the images, [imaging position! that stores position data indicating the imaging position in the movement direction. [imuguel that stores images data, [wear amount] that stoves wear data indicating the wear amount of svlinder liner 53 specified from images, snd lestimated wear amount] that storss estimated wear data. tudiestine the egtimated wen amsunt at the Dimes of capture of the images. lids

DK 181049 B1 16 Rach of [wear amount] and [estimated wear amount] hos the sub-level data fields [first divection], [seoond divectionl … [nth direction]. However, [nl represents the winnher of recessed portions 531 {refer to fig. 4) in the tircumferential direction, and in the. example in fig + nd, The [fest direction], [second direction]. nth direction] vorvespond respectively to each of n recessed portions 531 in the eiretnaferential direction ofevlinder liner 53. The First direction], {second direction], … Inth direction] that are the sub levels of [vear amount! store wear data indicating wear amount specified from the sive of images of øofresponding revessed portions 581. The [first direction], {second direction], … Ith direction] that are the sub levels of [estimated wear amount] atore estimater wear data indicating the estimater wor amount calculated using attribute dats pertaining fo navigation after the: previous imaging thong and relationship data, by using, as a relerence, the wear amon specified from the images of recessed portions S81 captured in the same imaging position at the inugring timing before the imaging timing of the data record thereof (heresfter referred to az "previous trsaging timing”), out Fig. 11 is a drawing sxemplifving the data configuration of an engine attnbute database stored in storage medns 120. The engine attribute database 13 a database for managing attributes data indicating attributes pertaining 15 past driving of an engine,

VTS The engine attribute database includes a data table pertaining to each af the sngines mounted on ship 5. The data table included inthe engine attribute database wv a collection of data records corresponding to seach measurement period. The data table of the enmne attelbute database includes Ineasurement period], fengins rotation speed], lengine load!, lair intake temperature], lexhaust gas temperature), leylinder oil amount], and the ke [ol Fig. 12 is a drawing exemplifying the data configuration of the mateorolestea marine database stored in storage means 120. The meteorological/maring database is a database for managing attribute data pertaining to meteorological or marine conditions encountered by ship § in the past and meteorological or marine conditions predicted to be encountered hy ship & in the future, foes The metearological/ marine database includes a data record corresponding to sach of ihe measurement periods pertaining to past meteorclogical or marine conditions, and a data record corresponding to each of the prediction periods pertaining to future meteorological or marine sonditions: The dats record pertaining fo the future meteseologiesl or marine conditions Jucfouded in the meteorslogicalfmarine database is updated with new meétsorelpyiesl/inhrine data reseivad by terminal deres 11 from server devices 13 via korter

DK 181049 B1 17 device 12, and data records past the prediction period are delsted. fos]

Bach of the dats records of the neteorologieal/marine database includes hasosurement period] that stores data indicating the measured period or prodicted period, hwind speed], lwind divection], [tide speed], [tide diveetion], wave height], and the fike. ove

The aboverdsseribød engine aibibute database and meteorologtonlmarine database sreexamples of datahuses for mannying attribute deta stored in storage means 120, Størage means 120 may stove, før example, a database for managing attribute data pertaining to the trim, & database for managing attribute data pertaining te ship speed, and the like. inosal

Fig. 18 is a drawing exemplifying the data configuration of a navigation schedule table stored in storage means 1200 The navigation schedule table stores data indienting future: navigation schedules of ship & The navigation schedule table. includes iport/navigstion. segment! that stores data indicating a portis) et which ship 5 cells of a navigation segments), and period! that stoves data Indicating the periud during which ship Tis moored st a port or the period during which ship 5 navigates & navigation segment. nos

Fig. 14 is a drawing Mustrating the functional configuration of server device 12. That i computer 20 operates as a device comprising the configuration ilustrafed in fre: 14 by executing date processing according to a program for server device 12. Following is an explanation of the Punetional configuration provided hy server devier 12, ors!

Åtiribute data acquisition means 121 receives, from terminal device 11, attribute data indieating attributes of navigation performed in the past by ship 5. When there is & plurality of ships 5, attribute deta acquisition means 121 receives attribute data from terminal device 11 mounted on each of the plurality of ships 5. forse)

A wear data acpusition means 122 receives wem data from terminal devie 11, A relationship data generation means 128 venerstes relationship data indicatig the relationship between attributes and wear amount using attrilnite data sequired by attrilute dain seginstlign means 121 and wear data aeguired by weir data negulsition meas 1838. For example, relatikmship data generation means 123 obtains a relationship formula that uses the wear amount as a target variable and each type of attribute as an sxplanation variable by menns of vagrassion analysis by using attribute data and wear data, and. generates relationship date indicating the oblained vrejationskep formute.

For the generation of relationship data. in addition to stibute datu and wear data pørtalning'to the target ship 5,

DK 181049 B1 18 sttnbute data and wear data pertaining to a different stop 5 of the same type as the target slip & may be used. 0087} A storage means 124 stores various types of data, ss deseribed below, First, storage means 124 stores a database for managing attribute data acquired by attribute data acquisition means 121 The database for managing attribute data stored in storage means 124 is similar fo the databases exemplified as the engine attrilute database (refer to fig. 11) or meteorologioa marine database {refer tre fig, 12) stored in storage means 129 of terminal devices 11: Storage means 194 stores a database før managing primaniiv wear dati uoouirød by wear data sequisition means 122. The database for managing the wear data stored in storaze means 124 is similar to the wear management database frefer to fig. 10) stored in storage means 120 of terminal device 11, If there. is a plurality of ships 3, these databases shoved in storage means 194 manage data pertaining to the plural br of ships A foose Storage moans 124 stares a duplieate of the navigation schedule table (refer to fig. 13) stored in storage means 120 of terminal device 11. H thers 1s w plurality af ships & storage means 124 stores duplicates of navigation schedule tables pertaining fo the plurality of ships vs Å regnestk means 125 regneste, from sover devise 13, metsorolosicalimarine dato tuficating meteorological or marine conditions predicted to he encountered by ship 5 during future navigations. Metoorologieal/narine data acquisition means 1268 acquires metsordogieal/marine data transmitted from server device. 13 in. accordance with a request from request means 135,

HSV Transmission means 297 transmite, te terminal device 11, relationship data generated by relationship data generation means 123, Transmission means 127 transmits, to termmal deves 11, metgornlogeslmarine data acquived by meteorclogical/imarine data svguisikon means 126. jon] Since the functional configuration of server device 13 is similar to the functional configuration ora general server device that débvers data to a reguest source according to 8 request, explanation tkoreofis omitted. fad Next, operation of cylinder liner exanunation system I is exsplatmed. First, in eyhinder finer examination system 1, fårminal devise 13 condinaously updates a database for managing attribute data sxomplified by the engine attribite database (afer to fig. 11) sø the

DK 181049 B1 19 meteorclogical/marine database (refer to Sg. 12) with attribute data received from group of measurement devices 9, Terninal devise 11 continuously updates the navigation schedule table (refer fo fig. 13) secording tø the current time or change in the current position of ship 5. Terminal device 11 sporadically updates these databases or tables according to Satarinput operations by & ranintensnes worker ar the like. foo Terminal device 11 transmits stored attribute data, wear data, and the like at a predetermined fregueney, fir example, Server device 12 updates stored datalsses with these ems of data transmitted from terminal device 11. Server device 19 generates relationship data using the stored attnbute data and wear data at a predetermined Heguency, for example, sod tranemite the relationship data fo terminal device 1148 a result. terminal device 11 van periodically acquire updated relationship data. ost Amamtensnee worker performs an operation for capturing an image of evhnder liner 58 at a suitable freguener by utilizing the time during which the engine in stopped Spercifivallyw the maintenance worker operates the control device of the motor to move pister 54 to the basic position, and subsequently places, on the upper surfaces of praton &4, Imagine device 14 set on holding tool 7. Then, the maintenance worker operates the contrøl device of the motor to move piston 54 back aod forth once within eyvlinder 51. fouss) While piston 54 is being moved hack and freth ones within evlinder 51, terniindl devices 11 transmits command data te imaging device 14 each time the position of imumng devices 14 reaches a predetermined position in the movement divection of cylinder liner 38 Imaging devise 14 performs imaging in scoordance with command data, and transmits the generated umage data to terminal device 11.

HE] Terminal devices 11 receives image data from imaging device 14, and stores the nage data in the wear mansgement databuse (refor to fig, 10). Terminal device 11 generates wear data based on the size of the image of recessed portions 531 included in the image indicated hy the received image data, and stores the wear data in the wear data management database, lone When new wear datas generated, terminal device 11 substitutes the wes sanitet æt the previous imaging timing and attributes indicated hv attrilute data pertaining to the period from the previous imaging timing to the present time in the relationship formula indiested by the relationship dats, and caleulates an estimated wear amount. Terminal davies 11 stores, ift the wear mandgement database, tstynsted wear data mojcating the ealvulsted entinsted wear amount.

DK 181049 B1 fogs

Tørninal devies 11 detects the possibility af abnormal wear according to whether oF not the difference between the estimated wear amount indicated bv the newly generated østimated wear data and wear amount indttated by wer data stored in the same data vecord satisfies predetermined conditions.

Whether or not a value obtained by dividing ike difference between thé wear amount and the estimated wesr ainount hy the integrated value of the total rotation speed of the engine from the previcus imaging timing to the prisent time js below a predetermined threshold value is used hereafter as a predetermined condition used te detect the possibility of abnormal wear by terminal device 11, However, this condition is merely an example, and other conditions may be adopted, such ås whether or not the difference between the wear amount snd the estimated wear amoonnd is below & predetermined threshold value, whether or not a value obtained by dividing said difference by the intserated value of the navigation distance from the previous imaging ming to the present time 18 below a predetermined threshold value, and the hike. for

When the possibility of abnormal wear of any of the cylinder liners 53 is detented, termined device 11 displays the soreen (horenfter referred to as “warning screen”) sxomplified in fe. 15, and notifies a maintenance worker, If the maintenance worker operates the "image view” bukton on the warming screen. tenninal device 11 displays the soresm (hereafter referred fo ss “image-viewing sten”) exemplified in flg. 16. The imagevviewing screen displays; in a row, the most recent image of a cylinder ner for which the possibility of abmormal wear was detected, and the previously captured image, The front view and upper surface view of evlinder liner 83 displayed. in regton ÅU of the image-viewing seresn have displayed in color the portion that is currently displayed on the image-viewing screen from among all of the regions of the eyhnder liner 83, amd the portion 19 wihieh the possibikty of shaormal wear was detected 1s marked. 01001

A maintenance worker ia easily able to confivny, on the inmage-vicwing soreen, the past and éurrent state of the inside surface of cylinder liner 53 for which the possibility of sbuormal wear was detected, The mamtensnee worker is also able'to operate terminal devise 11 to display other portions of eylinder liner 53, enlarge or reduce an image, and display a past image.

The image viewing screen is not only displayed by operation of the "image view” button on the warning screen, but alse when a predstermingd operation 18 performed on ternminst deviee 11, 01

A.malntenance worker is able to display past and current nnages of the famsoontaet surface on terminal device 11 by operating the "Mame niatact surface’ button on the image:

DK 181049 B1 21 viewing screen. Fig. 17 is a drawing syemplifying the imagesviewing screen in 8 state in which an image of the fanieromitact etrfave je dgplaved An sxhauvst valve, a føl valve, and the hke are arvanged on the flame contact surface. Accordmely, the maintenance worker 18 æble to confinm the stato of the exhaust valve, fuel valve, and the hike on the iuage viewing screen and Judge a suitable maintenance fiming and the like af these devices, Deposits af carbon, known as carbon flower, often adhere fo the vicinity of the tip of the fuel valve Carbon flower seers dig to a fuel combustion difeet, Accordingly, the maintenance worker is sble io confirm the state of varhun flower on the imagestewing screen illustrated in fig. 17 and obtain information pertaining to the state of fuel combustion.

io103 Moreover, a malotsnange worker Ja able to display on terminal device 11, the sores (hereafter veferred to as "temporal change viewing screen”) exemplified in fig. 18 by operating the "temporal change view” button on the image-viewing zeremn. The temporal change viewing streen displays, on a graph, the temporal shange of past wear amounts and future eøtimated wasr amounts pertaining to as target portion of ovlinder liner 53 Concerning a period during which a navigation schedule is: indicated in a navigadion schedule table, terminal device 11 calulstes the estimated wear amount when navigation 14 performed aeconding to dnavization schedule by using relationship data and future attribite data, and displays the estimated wear amount on a graph on the temporal change viewing seveen. Congering a period during which a navigation schedule i not determined, terminal device 11 caleulates the estimated wear amount when navigation is performed in it pattern similar fø a past pattern, for example, by using relationship data and past attnbute dats, snd displays the estimated wear amount one graph on the temporal change viewing screen. The maintenance worker is easily able to know the desivable replacement tuning of cylinder ner 53 fom the graph displayed on the temporal change viewing screen 103) Moreover, a maintenance worker can display, on terminal device 11, the scrsen thereafter referred to as "uneven wear verifleation screen”) exemplified in fig. 19 by operstung the “uneven wear confirmation” button on the imagé-viewing screen, The uneven wear verification screen displavs, as a graph, change in wear amount in the movement direction for each of the imaging directions. The malntenance worker is sasily able to known the extent of uneven wear of cylinder liner 53 from the graph on the uneven wear verification Loreen.

[0104] As desorbed above, acesrding to cylinder liner examination system 1. 2 ms8Jjntenanger worker ja easily able to view and accurately evaluate the state of wear of eylinder ner 53. 9108]

DK 181049 B1 22 In addition, according to evlinder liner exanungtion system I. a malntenance worker js easly able to emifiy the slate of the exhaust valve fuel valve oF the like armnged on the flame-contact surface. Moresver, according to cylinder liner exdminntion system 1, & manntenance worker ia able to confing the state of carbon flower adhered to the Haw contact surface. Since carbon flower often drops off during replacement of the fuel valve or opening of the cylinder cover, confirming the state of carbon flower was difficult in the prior art, The fact that evlinder liner examination svetem 1 makes possible confirmation of the state of carbon flower, which was difficult in the prior art, deserves special mention here.

[0106] [Modified Exarnplel The abovedeseribed. smbodiment may be modified in varius ways within the technical concept of the present invention. Examples of such modifications are indivated below. Two ormors of the below modifted exnmples ray he ecomhived.

[0107] i In tha embodiment described above, imaging device 14 sømpriste Imaging unit 141 that seamlessly vaptures a panoramic image of the entirety of a hemisphure. In place thevend, a configuration may be adopted wherein imaging device 14 comprises a plurality of imngine unite 141, and an image that covers a 360-degree imaging vegion in the circumferential direction of oylinder liner 53 by joining images captured by the pharality of imaging units 141. Fig. 2015 a drawing exemplifying the external sppesrance of imaging device 14 according to the prevent modified example. The arrow shown in fig. 20 indicates the imaging direction, Imaging device 14 exemplified in fe. 20 comprises five imaging units 141 in whish the viewing angle in the horisontal direction is approximately 100 degrees, Four of these imaging umts 141 are arranged, sø that the imaging direction is radial, at 90 degree intervals, The remaining umagihe unik 141 i8 kyranged so that the unagingdirgetion Is vertical. Control unit 143 generates ovlnder Hver image data by joining images captured simultanesusly by the four imaging units 141 areanged radially, Imaging unit 141 in which tha imaging dirgetiøn is vertival gensrates Oame-tontact surfare image data,

[108] {) Ta the embodiment described above, imaging device 14 performs imaging secording to command data transmitted from terminal device 11. In place thereof, a configuration may be sdopted, wherein imaging device 14 performs imaging each time så predeterninsd time period has elapsed. In this modified example, imaging device 14 performs imaging without receiving command data, and transmits the generated image data to terminal devies 11. Terminal] device 11 reseives image data fore imaging device 14, and stores, in the wear management database, position data generated at the same timing as the reception of the image data by assoninting the position data with the image data,

DK 181049 B1 23

108 (3) In the embodiment descnbad above, position data acquisition måne 111 of ternitnal device 11 generates position data using a crank angle.

The method in which position data æegtustlon means 111 goneratss position date ds not hmlted theteto.

D10

Før example, a configuration way be adopted wherein position data acquisition means 111 generates position data based on the distance between the upper surface of piston Fi and the flumeccontaot surfare of ovlinder cover 83. In such a vase, oylinder Bner sxamination system 1 somprises a fange finding means that is configured 20 as tabe capable of being disposed on the opper surface of piston $4, and that measures the distance between the upper surface of piston 54. and the flametcontact surfare of evlinder cover 82. and senerates movement direction distance data indicating the measured distance.

Position data soguistfion means 111 gentrates position data using movement divection distance date generated by a range-finding means, A configuration in which imaging device 14 comprises a range-finding mesns may be adopted. [oy

A configuration may be adopted wherein position data acyuisition means 111 generates position data based on tha atmospheric pressure ih piston 54. In sb a case, cylinder liner examination system 1 comprises an atmosphere pressure HEBSUTIIE means that 1s disposed on the upper surface of piston 54, and that measures the atmosphere pressure within piston 54 and generates atmospherie pressure data hvdlicsting the messured atmosphere pressure.

Position data acquisition means 111 pensrates position data using stmospherie pressure data generated by the atmospheric pressure Measuring means. oval

A configuration may be adopted. whersin position data semusition means 133 gonerstos positing date by using famevøntset surfave imneo data. fy sush 2 esse, position data acquisition means 111 specifics the position of imaging device 14 in the movement dirgetiøon based on the sis of an image of the Hamer contact surface indicated by the flames sontact surface image data, snd generates position dats indicating the specified position. fori

A configuration may he adopted, wherein position data scquisition mesns 111 ‘generates position data by using cylinder liner image data.

In such a case, recessed portions 531 having different shapes according to the position in the movement direction are srranged, wherein the shapes of recessed portions 831 are not Hmited to cones, and ave formed into trsnrular prrsmid shapes, square pyramid shapes, sml the hike, and the eross section of the spindle is formed into a star shape, an arvew shape, or the likes.

Position data acquisition means 111 apeofies the position of Imaging device 14 in the srøvement divection based cn the

DK 181049 B1

24 shape, direction and the like of sn image of recessed portions 831 indicated by evlinder liner image data, and generates position data indionting the spesiSed position. 114d (4) In the embodiment described above, terminal device 11 associates mage daty generated by imaging device 14 with position data acquired by postition data acquisition means 111. In place thereof, imaging device: 14 may sasotitte the image dats with. the position data.

In suet 4 case, ima sing device 14 comprises position data acquisition means HL mssoclates image data generated by imaging unit 141 with prsition dota semuired hy position dada acquisition means 111, and subsequently transmits the associated data to terminal devies 11. 115 (5) In the embodiment described above, itis assumed that imaging device 14 is disposed in the correst divection on the upper surface of piston 54. That te, when ing device 14 is disposed in år incorrest divechion, it beconiss unclear which portion of the image indicated by the ovlinder liner: image dats indicates which portion of the actual evlinder liner 33. Accordingly, a configuration may be adopted wherein evlinder liner examination system 1 comprises a direction data acquisition means that acquires diroctien data indicating the maging direction of imægtrig device 14. forte

For example. a configuration wav be adopted: whersin the direction data aeqiisition means generates direction data by using flaswreontaet surface image data, In such a case, the direction date acquisition means generates divection data based on the position of an image of a structure such as a fuel valve ineluded in the image of the Dame-contaet surface mdicated by the flamecontact surface image data,

0117

A configuration msy be sdopied wherein the direction data segubsitinn means cenerates direction data by using evlinder finer image data, In such a case, the shape, direction and the like of the orøss section of recessed portions 531 provided to cylinder hiner 53 are made different according to the virsumferentual direction, The direction data svguieltion means species the imaghig tMrection høsed on the shape, divection and tha Ike of the image of recessed portions 531 nulicated by the evlinder liner image data, and "genterites direction data Didicatibg the specified direction. fois!

A configuration may be adapted wherein characters, smbols, or drawings indicating the aging direction are provided to holding tool 7. That is, ins state in which imaging device 14 18 set on holding tool 7, characters, symbols, or drawings indtenbing the maging divention are provided mvsuitable pesmtens on holding todd 7 sø that the charnetsvra, sumbolk,

DK 181049 B1 or drawings indicating the imaging divection are reflected in the imaging region of imaging deves 14. In such a dade As Tong ag holding teal 7 js positioned id the correct poslliun ni the upper surface of piston 54, the imaging direction van be specified based on the characters ér the hleveflected in the Image. foal 5) A configuration: may be adopted wherein cylmder liner examination aystem I comprises a correction means for correcting distortion of eylinder liver mde data, For sample, when imaging devire 14 is disposed on g point that js offset fivan the center of the upper surface of piston 54; the image of the evlinder Inter captured by imaging device 14 has an uneven seale due to the position in the dircumferential direction. The correstion means corrects the ovlinder Diner image data so as to even ound this uneven aval. neo For svample, imaging device 14 measures the imaging digtance pertaining to each of a plurahty of imaging directions, that is the distanve from imaging unit 141 to the made surfage of cylinder liner 53; and generates imaging distance data indicating the measured distance. The correction means vorruets the cylhuder liner image data by using the imaging distance data generated by imaging device 14, Moreover, & confipuration may be sdopted wherein the correction means cofrecta the cylinder liner unage data by using famecantact surface image data. In such a case, the corferjon means spocilies distortion Wan image indieated by the evyhuder liner noage data kæsed on distortion in an image of the flame contact surface dicated by the fame contact surface image data, and comrsete the eylinder Hiner image data so ws to eliminate the specified distortion. faa] I In the embodiment described above; sebver device 1% generstes relationship dats indiesting the relationship betwson sttributes and wear amount by means of factorial analysis. The method for generating relationship data ts not limited to faetorial analysis, For example, othér methods may be adopted for generstion of relationship datå, such ås a method of obtaining an spproximation formula that approximates the relationship between the wear amount and the hitegrated value of the engine rotation speed in which a weighting corresponding to the engine load is multiplied.

faa (8) Recessed portions 831 prøvided to evlinder liner 53 may be filled with a msterial thereafter referred to as “filling material”) with & color different to that of the material of eviinder hver 53. In such a case, after forming of evlinder 83 compnsing recessed portions ABT 13 complete, recessed portions 031 are filled with a filling material. Then, the inside surface af evlinder linse 53, which hax bøen filled with the filling material in recessed

DK 181049 B1 26 portions 531, is polished. Ihre to these steps, a evlinder liner 83 having hide unevenness, slidsbiltv, and ajptighinese on the inside smurdfne 18-obtained, 0124 In oa modified example in which evhnder liner uøoge data is sed ta sposify the position of imaging device 14 in the movement divection, a filling material having a different color in the movement drection may be used. In such a case, even if the shape or direction of the cross sections of recsssed portions 831 are the same in the movement direction, the position of imaging device 14 in the movement direction can be specified by the polar of the filling material. i125} Merecver, in a modified exsmple in which setinder Bier image data Je used to specify the imaging direction, s filling material having a different color in the circumferential direction may be used. In such 8 edge, oven. if the shape or rection of the eos sevtlens of recessed portions 531 ie the same in the cireumferential direction, the imaging direction ean he speeified by the coloe of the filling materig!.

[0124 ig The shape of recessed portions 531 provided to cylinder liner 83 is not limited tos spindle shape, and may be any shape as long as the shape has a crvas section in which at least one of the size; shape, aod direchion changes according fo the advancewent of wear. ln a modified exaople mm which recessed portions 831 are Nlled with a Blliag material: & configuration in which the coder of the filling material changes according to the advancement of wear by laminating a plurality of different-voloved Allinge materials may be adopted. In such a ease, the cross section of recessed portion 531 dees not necessarily need to thangs seeording to the advancement of wear, That is, the configuration of eylinder liner S3 is not Fuwited as long as the inside surface of cylinder liner 83 generates a pattern in which at least one of the size, shape, and direction changes sccomding tothe advancement of wear, [0127 (10 In the embodiment dessrbed shove, a plurskty of recessed portions 831 provided to eyhrder hiner 53 ave provided on the intersections between & plurality of straight lines thet extend in the movement direction and a plurality of circles that ave provided. in the sireumfrrential direction. The arrangement of recessed portions 531 previded tn evlinder hier 53-is not limited thereto. For exangile, a single recessed portion 331 niay be disposed øn & representative point. Alternatively, 8 plurality of recessed portions 531 may be arranged in a row so as to form a spiral on the inside surface of cylinder liner 33. Groove like recessed porkions 831 may be sdepted. Fie: 21 is 08 deawing exemplifving the posttkms of recessed portions 531 on oylinder liner 53 comprising recessed portions 531. As ilhustrated in fg, 23a), a plurality of recessad pørtinns 831 that extend im the movement drschen way be provided

DK 181049 B1

27 on the inside surface of cylinder liner 53. As illustrated in fig. 2100, a plurality of recessed portions 531 that form a ejvele in the oimumforentia) direstion may be provided an the inside surfate of éylinder liner 53. The shape of the cross section when a gréove like recessed portion 531 ja cud in the ongituding) direetion oni vorteal surface oa Vahape, for example, [0124 (AD In the embodiment described above, holding tool 7 has a plurality of legs, and the tips of the legs come into contact with the upper surface of piston 84. In place thereof ix configuration iy which holding tool 7 hus a vontact surfyce that hae a shape that engages with the shape of the upper surface of piston 54 may be adopted.

Fue 22 ie a drawing schematically Wustrating 4 state in which holding. tool 7 having a contact surface that engages with the recesses and protrusions of the upper surfsoe ie placed on the upper surface of piston 54 having recesses and protrusions, According to this modified example, a maintenance worker 18 sasily able to position imaging device 14 in a get position on the upper surface of piston 54. fo120 (12) A sorvew hole used when extracting pisten 54 from ovlinder 51 ia sometimes provided to thie upper surfsee of piston 54, Adonfignration in which Kolding tool: 7 hats a rød-like body that is inserted into the recess when piston 54 has a recess such as a serew hole on the upper surface may be adopted.

Fig. 23 is a drawing schematically Wlustrating a state in. which holding tool 7 according to the present modified example is attached to the upper surface of piston 34. According te this modified sxample, even if the axis of cylinder 51 de inclined with respect tø ths verheal direction, for example; imaging device 14 does not become offset from the set position on the upper surfure of piston 84, The rod-like body provided hy holding tool 7 exemplified in fig. 23 ie not provided with a serew thread.

In place thereof, a configuration may be sdopted in which holding tool 7 ie provided witli a rod-like body into which a screw thread 1s cut, wad the redtlike body ie inserted into the zorew thread (recssg) by means of the rod-like body being serewed into the screw hole provided to the upper surface of piston 54. fran 13) In the embrdiment described above, terminal device 11 detects the possibility of sbrormal wear based on the differance between the estimated wear amount and the actual wear amount.

In place thereof, or in addition thevets, a configuration in which the possibility of abnormal wear is detected based on the change in the wear amount of terminal device 11 over time nay be adopted.

Fig. 24 is a drawing exemplifying the temporal charge viewing screen displayed by terminal device 11, In this modified example, when the rate of change in wear amount changes signiftcantly, a maintenance worker or the like is: notified of the possibility of sbugtnal weae The vate of change in wear amount Ja a value obtained by dividing the change amount of the wedr amount by the attributes of the main causes), For

DK 181049 B1 28 sxample, the integrated value of the engine rotation speed (for example, a value obtained by multiplying a woghting corresponding to the engine bad), the integrated value sf the navigation distance {for example, a values shtained by multiplying a weighting corresponding to the engine load), the integrated value of the navigation time, and the like may be adopted, sd (14) — The method for using images captured by imaging device 14 iz not limited to that indicated in the embodiment described above, For example, images captured by imaging device 14 may he used tenable a malntensnee worker or the like of ship 5 cusily to use the might of a spermalist such då a techmetan of the engine munufseturen.

Specifically. the dat fuld fevaluationd is provided to the data table of the wear management database {eefor to Sg 10) stored in server device 12, for example, Beever device 12 comprises an evaluation. data semriisition means for acquiring evaluation deta indicating evaluations pertaining to the state of the inside surface or Hamercontaet surface of evlinder liner 33 interpretæun hy 8 specialist by viewing an image, Evaluation data acquired hv the evaluation data sequasition means ia stored in the wear management: fatsubaes.

Jf a maintenance worker operates terminal device 11 and specifier an image. of evlinder liner 53 ev the Qamecontast surface for which ovalnafion ix fo be obtained, terminal device 11 trandmits image data of the spørifed image to server devige 12. Server device 12 stoves image data Indicating predetermined sunllarities with image data transmltted frem terminal device 11, and corprises an. extraction means exbråeting: from the wear mansrement database a data recon that stores evalustion. data, Server device 12 transmits, to terminal device 11, the image data and svalustion date of the extracted dats vecord.

Terminal device 11 displass, to the manttenande worker the vontents of the image data evaluation data transmitted from server devices 12. os 13 Images captured by imaging device 14 sometimes indicate damage fabrastons, corrosion, ete.) to evlinder Jiner 33. Arvonfiguration may be adopted in which terminal device 11, for example, extracts data that is useful for specifying the canse of the abnormality and notifies.a maintenance worker or the like of ship 5 of the data according to the detection of danage to cylinder liner 53. fas

In this modified example, attribute data soguisitien means 11¢ of terminal device 11 sequives, ir addition to the atinbule data aequired in the embodiment described shove, attribute data pertaining to maintenance work performed in the past on ship 5, attribute data pertaining to the fuel oil used tthe past by ship 8, ør the like, for example. as attribute dats jndicating the attributes of navieation performed in the past that is ngeful for specifying the cease of damage to ovlnder liner 33. These items of attnbote data may be date input bey a matstensnge worker ar tha hike af ship 5, or data gemerated by ao device sinh ss a contral

DK 181049 B1 29 device that controls a switching valve that switches a fuel tank that accommodates fuel oil suppbed to the aviping, for example 191341 Attribute data acquired by attribute date segoisition means 114 ie stored in storage means 120. Fig. 25 is a drawing exenplifying the data configuration of a maintenance work database for managing attribute dats pertaining to maintenance work perforined on ship & The table of the maintenance work database ix a collection of data records corresponding to melntenanee work, and provides, as duta fjelde, [date and time] that stores data indicating the date and time at which malinteranes work was performed. [device named and lemnaponsnit nhamel that store dats indicating deviee and component names for maintenande, and ssintenanee work namel that stoves date indicating the name of måintenance work.

10135] Fig. 26 is a drawing axemplifving the data configuration of a used fused oil database for managing attribute data pertaming to fuel oil used by ship "5. The used fuel oil database meludes a table corrssponding to each of the engines when & plurskiv of engines are mourted on ship 5. Fig. 86 exemplifies a table pertaining to an engine wlentibed by the engine ID “OLY The table of the used fuel oil database 18 & vollection ef data resovda coresmonding to each of the fuel oils continuously used from the same fuel all tank, and provides, as data Selde. [period] that stores data indicating the period in which a fuel oil was used, [tank mumbert that stores the tank fumbers that identify the fuel oil tank in which the fuel oil that was used was accommodated, [IBDN number) that stores the BDN number that identifies the BON (Bunker Delivery Note) of the fuel oil that was used, Hasuerl that stores data indicating the name of the jasuer of the BDN, oom temperature viscosity] that stores data indicating the room temperature viscosity of the fuel oil for example, the kinematic viscnstty at 40-50 degrees Celsius) [sulfur content! that stores data indicating the sulfur contort of the fuel oil, and the like.

[0138 Inthia modified example, when damage to evlinder liner 58 38 detected hy means of a maintenance worker of ship 5 viewing an image (fg, 6) of any of cylinder bners 53 displayed on terminal device 11, for example, the maintenance worker performa a predetermined operation on terminal devies 11. Terminal devies 11 comprises an extraetion means for extracting attøibute data from each ispe of database stored in storage mesns 120 according to predetermined conditions by using a predstørmined operation by a maintenance worker ag a trigger, Conditions used by the extraction means io exivact attribute data are the eoralitions for extracting atbibute data useful for speefinug the couge of damage to svinder fiber 53 specified by the maantenancs worker Terminal device 11 displave the contents of the attribute data extracted bythe extraction messy to the maintananes Worker.

DK 181049 B1 mar Fig, 27 is a drawing exemplifying the sores displayed by terminal device 11 to a maintenance worker ini thas modified example The scrsen in fe: 27 displays the tabt ‘maintenance work” “used fuel oil” “exhaust gas temperature/mnternal presinoe,” and the fike. & page corresponding tu each of the tabs on the serøen in fig 27 displays the contents af the type of attribute data corresponding to the name of the tab {tak name) in a table or on a ersph. The pages in fie. 27 is 5 page corresponding to the tab name “mainienance work.” 0188) The maintenanes work displaved on the page in fie. 27 is muolntenanes work performed, on cylinder 51. corresponding to the cylinder liner 53 specified by the maintenance worker, within a period from the timing at which the previous fpevultimate) imaging was performed and the timing at which the current (last) imaging was performed by imaging device 14. Terminal device 11 displays the page in fig. 27 by using attribute data extracted from. the maintenance work database (fig. 25). The maimtenance worker 1s able to view the page in fig. 27 to determine whether or not damage to cylinder liner 53 was enused by an error in malintenanee work (for example, whether an abnormal object: such as a sceew has entered sylinder 51), for example.

0139 Fig. 28 is n-drøvwing exemplifyigg a page corresponding to the tab omme "used fuel oil.” The fuel oil displaved on the page in fig, 28 w fuel otl used by an engine corresponding to 8 eylinder liner 33 specified by a maintenance worker within g period from a timing at which the previous {pemdiimate) imaging wag performed and the timing at which the vurrernt (ast) imaging was performed by imaging device 14. for example. Terminal device 11 displays the page in fig, 28 by using attribute data extracted from the used fuel oil database (Hy, 26), The maintenance worker ¥s alle to view the page in fg 28 fo determing whether og not dunage to avhnder mer 58 was casnsed by the used fuel vil (for example, excessive enntent of silica, aluming or the like in the fuel il), for example, fora} Fig. 29 is a drawing øxemplifying the page corresponding to the tab name “exhaust gas tempersturefnternal pressure.” The pape in fig, 29 displavs » graph Inditatfing the change, over time, in the exhaust gas temperature snd internal pressure af the eyhnder 31 torrespondigr to the oviinder liner 53 specified by the stgintenance Worker, Thi athmust gas tempersture and internal pressurs varies sccording to the load of the engine. Accordingly termingd device 11 converts the measured exhaust gas temperature and internal pressure into: the exkaust gas temperature and internal pressure af a 50% ond, for evample, according to a predetermined conversion formula for conversion table) based on the load of the engine corresponding to sylnder Boer 33 speafied by the ursintsranes onrker: The

DK 181049 B1 31 graph displayed in. fe, 28 indicates the exhaust gas temperature and internal pressure after SOBVersiom. M141} Terennsl device 11 displays the page in fig, 29 by using attribute data extracted from the engine attribute database (fig, 11). A maintenance worker is able to view the page in lig 28% to determine whether damage to oylindat liner 58 18 caused by damage to a component of evlinder 51 for example, damage to the exhaust val vej, foregample. fai In this modified example. dutection of damage to eylinder hver 83 may be-performe by have andlysis processing of terminal device 11, for example. In such a case, & malntenance worker Ja not required to defeot damages to sybnder liner 53 by viewing an image. Moreover, in this modified example, attribute data may be extracted according to condibons corresponding to the type of damage detected Uor example, scrapes; corrosion, and the like). For example, a configuration may be adopted in which, if 3 scrape is defected in eylinder liner 53, attribute data pertaining to maintensnæ work is extracted, and if low: tampersture corrosion ix detected, attribute data pertaining to the lad of the engine is extracted, fot 1Ø In the embodiment described above, a configuration may be adopted in whichs part af the components provided by terminal device 11 js provided by server device 12. Moreover, in the smhodiment described above, a configuration in-which a part of the components provided hy server device 12 is provided by terminal device 11 may bé adopted. For exænple, in the embodiment described above, relationship data gerevation means 123 previded by server devine 12 may be provided hy terminal device 11.

01441 (19 In the embodiment desmibed above, an image paptured by imaging device 14 while piston 54 moves back and forth once inside evlinder 81 (more semmately; while pistm 84 ix moving either backwards or forwards) covers the entive region of cylinder liner 83. In place thereof, 3 configuration in which imaging devise 14 captures a clear image of only a predetermined region of cylinder liner 53 may be adopted. Forexample, when a maintenance worker ar the like wishes tø know the state of wear of a region that is close to the top of svinder hiner 53, diinaving device 14 need. only perform imaging in a position that is close i the top of evlinder liner 53.

[0145] {18) In the embodiment described above, terminal device 11 and server device 12 are realized by means of a general computer caveying out & process åuconling to a program, In place thersof, terminal devine 11 andlor server device 12 may be sonfisured as a socalled

DK 181049 B1 32 dedicated device. [Eyplanation of the Referstine Numerals) [el L... evhinder hver exandnstion system

8... ship

6... commiticdtion satellite

7... holding too! A... crank angle mesgsurement devise

9... group of mæssurmment devices LQ... computer

11. terminal device

18. server device

13... server davies 14… imaging device ZL... computer

51. oylnder 59… cyhader cover Ba. cylinder liner Ft... pk

41... engine rotation speed measurement device 92… engine load measurement devise

43... wind speed/wind dirsetion measurement device $4… tide spred/tide direction messurement device

85... ground speed messurement device

98. og speed measurement device 101… ovemuiry

102... processor

103. communication interfåee LM. display device

105. oferation-device

110. timing means FEM. position data soguasition means

1122. vonmnand menni 113… image data aemnsttion means

114... attribute data seguistion means

118. wear specifying means LE. Aransinisston means

DK 181049 B1 33

117. relationship data semnsition means TAL. ass Betina bion meals 119… notification means

1230... stortte meas

1231. attribute data acquisition means

122... wear data sequisition means

123... relationship data generation means 124… storage musa

123. request means L236... meteorological marine data acquisition means FAT. transmission means

141... imaging unit 14%... Yight-enut bg unit.

143. contrel unit

144. receiving unit

145... storage unit L4G. Ersripielserogt want

201... memory

202... prutessuyr 205… communication interfare

811. scavenging port

531... recessed portion

Claims (1)

DK 181049 B1 34 Patent claim [Requirement 1] System for examining a cylinder liner, the system comprising an imaging means configured to be placed on a top surface of a piston in an engine, the imaging means forming an image of the inside of a cylinder liner covering an inside of a cylinder , housing the piston and generating cylinder liner image data, and position data obtaining means for obtaining position data indicating a position of the imaging means in a direction of movement of the piston, characterized in that the imaging means is arranged for imaging the flame contact surface of the cylinder cover positioned at the top of the cylinder and for generating flame contact surface image data, and the position data obtaining means is arranged for generating the position data using the flame contact surface image data. [Requirement 2] The system of claim 1 comprising command means for issuing an imaging command to the imaging means when the position data indicates a predetermined position, wherein the imaging means is arranged to perform imaging in accordance with commands received from the command means. [Requirement 3] System according to claim 1 or 2, wherein the position data acquisition means is adapted to obtain crank angle data indicative of a crank angle relative to the piston, and generates the position data using the crank angle data. [Requirement 4] System according to claim 1 or 2, comprising DK 181049 B1 a distance measuring means configured to be placed on the top surface of the piston, the distance measuring means being arranged for measuring the distance between the top surface of the piston and the flame contact surface on a cylinder cover, which is positioned at the top of the cylinder, and for generating movement direction distance data , indicating the measured distance, wherein the position data obtaining means is arranged to generate the position data using the movement direction distance data. [Requirement 5] System according to claim 1 or 2, wherein the position data obtaining means is arranged to generate the position data using the cylinder liner image data. [Requirement 6] A system according to any one of claims 1-5, comprising directional data obtaining means arranged to obtain directional data indicative of the imaging direction of the imaging means. [Requirement 7] System according to claim 6, wherein the directional data obtaining means is adapted to generate the directional data using the flame contact surface image data. [Requirement 8] System according to claim 6, wherein the directional data obtaining means is adapted to generate the directional data using the cylinder liner image data. [Requirement 9] A system according to any one of claims 1-8, wherein the imaging means is adapted to measure the distance from the imaging means to an imaging subject and to generate imaging distance data indicative of the measured distance, and DK 181049 B1 36 the system includes a correction means for correcting the cylinder liner image data using the imaging distance data. [Requirement 10] A system according to any one of claims 1-8, wherein the system comprises correction means for correcting the cylinder liner image data using the flame contact surface image data. [Requirement 11] A system according to any one of claims 1-10, comprising wear specification means for specifying the extent of wear on the cylinder liner using the cylinder liner image data and generating wear data indicative of the specified extent of wear. [Requirement 12] A system according to claim 11, wherein the imaging means is adapted to generate cylinder liner image data relating to each of a plurality of cylinders of the same type provided by an engine mounted on one ship or on each of a plurality of ships of the same type, and the system comprises attribute data obtaining means for obtaining attribute data indicating attributes of navigations made in the past with the one ship or the plurality of ships of the same type, the attributes affecting the wear of the cylinder liner, and a ratio data generating means for generating ratio data indicating the ratio between the attributes and the extent of cylinder liner wear using the wear data and the attribute data. [Requirement 13] System according to claim 11, wherein the imaging means is adapted to generate cylinder liner image data relating to a cylinder provided by an engine mounted on a ship, and the system comprises attribute data obtaining means for obtaining attribute data indicating attributes of navigations performed with the ship, as the attributes affect wear DK 181049 B1 37 on the cylinder liner, and a wear estimator for estimating the extent of wear on the cylinder liner using the attribute data and the ratio data and generating estimated wear data indicating the estimated extent of wear. [Requirement 14] A system according to claim 13, comprising notification means for notifying a user, using a predetermined notification, if the difference between the amount of wear indicated by the estimated wear data generated by the wear estimator and the amount of wear indicated of the wear data generated by the wear specification means relating to the cylinder liner in a certain time interval meet predetermined conditions. [Requirement 15] A system according to any one of claims 1-14, wherein the imaging means is arranged to generate cylinder liner image data for each of a plurality of cylinders of the same type, and the system comprises evaluation data obtaining means for obtaining the cylinder liner image data generated by the imaging means and evaluation data, indicating an evaluation regarding the condition of the cylinder liner on the basis of the image indicated by the cylinder liner image data, and an extracting means for extracting, from among a plurality of items of evaluation data obtained by the evaluation data obtaining means, evaluation data corresponding to the cylinder liner image data indicating predetermined similarities between cylinder liner image data specified by a user. [Requirement 16] A system according to claim 1, wherein the imaging means is adapted to generate cylinder liner image data relating to a cylinder provided by an engine mounted on a ship, and the system comprises attribute data obtaining means for obtaining attribute data indicative of attributes for navigation, as in the past is carried out with the ship, and DK 181049 B1 38 an extracting means for extracting attribute data that meets predetermined conditions corresponding to the damage among a plurality of items of attribute data obtained by the attribute data obtaining means when an image displayed by the cylinder liner image data generated by the imaging means indicates damage to the cylinder liner . [Requirement 17] A method of examining a cylinder liner, which method comprises a step of moving the piston of an engine with an imaging device mounted on the top surface thereof within the cylinder containing the piston, and a step of forming an image of the inside by the imaging device of the cylinder liner covering the inside of the cylinder while the piston is moving within the cylinder or after the piston has ceased to move within the cylinder, the imaging means forming an image of the flame contact surface of the cylinder cover positioned at the top of the cylinder, and generating flame contact surface image data, wherein position data indicating a position of the imaging means in a direction of movement of the piston is generated using the flame contact surface image data. [Requirement 18] A system according to any one of claims 1-16, comprising a retention tool configured to be positioned on the top surface of the piston in an engine, the retention tool retaining the imaging device while preventing the transfer of heat from the piston to the imaging device . [Requirement 19] The system of claim 18, wherein the retention tool has a resilient body disposed between the top surface of the plunger and the imaging device. [Requirement 20] System according to claim 18 or 19, wherein DK 181049 B1 39 the retention tool has letters, symbols or drawings indicating the direction of imaging by the imaging device | the imaging area of the imaging device. [Requirement 21] A system according to any one of claims 19-20, wherein the retaining tool has legs which support the imaging device in a state where it is separated from the top surface of the plunger. [Requirement 22] A system according to any one of claims 19-21, wherein the retaining tool has a rod-like body inserted into a recess provided in the top face of the piston. [Requirement 23] A system according to any one of claims 19-20, wherein the retaining tool has a contact surface having a shape that engages with the shape of the top surface of the piston.