DK201700501A1 - 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

Hype of Document] Specific «! Km [Title of invention! SYSTEM AND METHOD FOR EXAMINING CYLINDER. IJMISR, HOLDING TOOT, FOR IMAGING DEVICE, AND CYLINDER. LINER [Technical Field] [0001]

The present invention relates to a technique for examining the cylinder liner of an; engine, [Background Art! [0002!

As maintenance work for a large engine stick as an engine niounted cm a large ship, the state of »'ear of the: cylinder liner is deter.minefi [.0003] A method of directly viewing or imaging the: inside ^ surface: of a cylinder liner by means of a maintenance worker entering the cylinder is known as a method for; confirming 'the state of wear of a cylinder liner, loQQdl

Moreover, a method of imaging the inside surface of a cylinder liner by iiMn.g; an imaging device inserted by a maintenance worker into the cylinder via a scavenging port provided to the cylinder is known as another method for confirming the state of wear of the cylinder tiner, [0005] .1.¾ a document disclosing a technique for confirming: · .the; state of wear orlan stored eoinpoaeat. Foletii: document l discloses o techniqxje · £ © *. q ^ tfing a .plf ^ on.hsini »'®. color different from that of the piston main body so as to cover t he processing grooves generated when processing the piston of an engine, driving the engine using the piston that has been coated, and then removing the piston from the cylinder 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 | [smoke!.

[Patent Document ij JP 8'247724 [Outline of the Invention] [Problem to be Solved I> y the Invention] 1000¾

Tb carry out a method .for direct viewing or iroaging ^ é: before &if; ifrfecø :: ø8 cylinder liner he means of a maintenance worker entering the cylinder (hereinafter referred to as "" direct: approach method "), it is necessary io open tin: 'cylinder cover, which requires a significant an emu: of' time and effort. Accordingly, it is inefficient hi carry out the direct approach method frequently. Moreover, a maintenance worker is not able to enter the cylinder immediately after operation. of the engine has stopped, since the temperature inside the cylinder is high, Accordingly, the direct approach method cannot be carried out until the inside of the cylinder has corded down, thus prolonging the operation. to mount and dismount a chair inside the cylinder; imposing a physical burden and increasing the risk of accident.

IoqoM

Meanwhile, when using a metlmdlpr imaging the inside surface of a cylinder liner by using an imaging; device inserted via a; scavenging port thereafter referred to as: “feed imaging; & clear linage cannot be obtained in the vicinity of the top of the cylinder, which is far away from the scavenging port. Usually, since wear of a cylinder liner is more advanced in the vicinity of the top of the cylinder than in the vicinity of the bottom of the cylinder, to evaluate the state of wear of a cylinder liner sufficiently, a clear image of not only the vicuhly of the bottom of the cylinder but also the proximity of the top of the cylinder is required. According to the fixed imaging method in which a clear image of the vicinity of the top of the cylinder cannot be obtained, the state of wear of a cylinder liner cannot be adequately evaluated.

[0009]

Moreover, with either the direct approach method or the feed imaging method, verifying the positions from images of the same cylinder liner captured at different timings is complicated. Accordingly, change in the state of wear in a specific region of the cylinder liner cannot be easily obtained.

Loo ιοί

In view of the above-described matter, the purpose of the present invention is to: provide a means that; enables easy and accurate evaluation of the state of tear of a pajindei lines iMeans? for Solving the Problem! . [{II Hi]

To solve the above-described problem, the present invention provides a system for examining a cylinder liner, comprising an imaging means which is configured so as to be capable of being disposed on the upper surface of the piston of an engine, said imaging means imaging the inside surface of a cylinder liner that covers the inside surface of a cylinder that accommodates the piston and generating cylinder liner image data indicating the captured image, and a position data acquisition means for acquiring position data indicating the position of the imaging means in the movement direction of the piston. jP0I2i A configuration may also be adopted with the above described system comprising an instruction 'means for instructing imaging to the imaging means when the position data indicates a predetermined position, the imaging means performing imaging according to the instructions of the instruction ing · mean. - ..

[0013! A: configuration may also be adopted where:, in the aboyecdescribed system, the, position data (acquisition means acquires crank angle data indicating a crank angle pertaining to the piston and generates the position data using the crank angle data, iooul A epnfignration may also be adopted, the above-described system / comprises a range-finding means that is configured to be capable of being disposed on the upper surface of the piston, said range-finding means measuring the distance between the upper surface of the piston piston and the flame “contact” surface of a cylinder cover positioned at the top of the cylinder and generating movement direction distance data indicating the measured distance, while the position data acquisition means generat.es the position data using the movement direct km distance data.

[001.5! A configuration .may also adopted, with the above-described system, the unaging means images the flame-contact surface of the cylinder cover positioned at the top of the cylinder and generates fJame-c.onraet surface image data indicating the captured image , and the position data acquisition :: me »ns :: generates the position data: using the ikumpconfaet ..surface image data, [0016! A configuration may also have adopted, in the above-described system, the position data acquisition moan; -; generates the positin 'eta * using the cylinder liner image data, A configuration may also be adopted with the above described system comprising a direction data acquisition means that acquires direction data indicating the imaging direction by the imaging means.

[0018! A configuration: may also be adopted, in the above described system the imaging: means intakes: the llame-contaet surface of the cylinder cover positioned at the top of the cylinder and generates flame-eostact: surface image data indicating the captured image, .and the: direction, data acquisition means, generates the direction data using: the flame 'contact surface image data. tag Λ configuration rn ay also be adopted, in the above-described ay stern, the direction data acquisition means generates the direction data using the cylinder Inter image data.

[0020] A configuration may also be adopted, using the above-described system, the Imaging: means measures the distance from the imaging means to: an imaging subject and -generates imaging distance data indicating the measured distance, said system comprising a correct tors means for correcting: the cylinder lingriaiage data using the imaging distance data. [00211 A eonfigtiratton: may also be: adopted: where, ip the abeveuiescribcd system, the imaging means images the flame-contact surface of the cylinder cover positioned at the top of the cylinder and generates flame-contact surface image data indieatmg the captured image , said system comprising a correction means for correcting the cylinder liner image data using the flame "contact surface image data, 100221 A configuration may also be adopted by the above-described system comprising a wear-specific means for specifying the extent of wear of the cylinder liner using the cylinder liner image data and generating wear data indicating the specified extent of wear, [00.23] A configuration, may also be adopted, in the above-described system * the imaging: means generates: cylinder liner image: data pertaining to each of a plurality of cylinders of the same type provided by an engine mounted on one ship or each of a plurality of vessels of the same type, said system comprising ribute data acquisition means for acquiring attributes data dedicating attributes of navigation performed in the past by the one ship or the plurality of ships of the same type, said attributes influencing the wear of the cylinder line); ami a relationship data generation means for general mg relationship data indicating the relationship bet ween the attributes and tree extent of wear of the cylinder liner using the wear data and the attribute data.

[0i! 24j A eon figuration may also be adopted, in the above-described system, the imaging means generates cylinder liner image data pertaining to a cylinder provided by aa: engine mounted on a ship, said system comprising an attribute data acquisition means for acquiring attribute data indicating attributes of navigation performed by the ship, said attributes influencing the wear of the cylinder liner, and a wear estimation means for estimating -thb .: j $ E £ c &amp; .df of the cylinder liner using thb: «tøhdbtfte" data. "&amp; <£ tb &amp;; relationship data and generating estimated wear data indicating the estimated extent of wear. tesi A configuration may also be adopted using the above-mentioned system. a notification means for providing a user predetermined notifications if the difference between tine ex lent of wear indicated by the estimate fed wear data generated by the wear estimation means and the extent, of wear indicated by the wear data generated by the wear · specifying means 10026! A eojtfignr & fion .may also be adopted, in the aboye ^ deseribed system, ie imaging means: generates cylinder liner image data for each plurality of cyampinder of the samp type, said system comprising an evaluation data acquisition means for acquiring the .cylinder liner image data generated by the imaging means and evaluation data indicating an. Evaluation pertaining to the state of the cylinder liner based on the image indicated by the cylinder 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 to cylinder Imer image data indicating predetermined similarities between cylinder liner image data specified by a user. 10027] A configuration may also have been adopted, with the above described system, the imaging means generates cylinder liner image data pertaining to a cylinder provided by an engine mounted on a ship, said system comprising an attribute data acquisition means for le data indicating attributes of navigation performed in the past by ins ship, and an extraction means for extracting attribute data that satisfies predetermined conditions corresponding to damage from among a plurality of items of attribute data acquired by the attribute data acquisition means when an image shown by the cylinder liner image data generated by the imaging means indicates damage to the cylinder liner.

[12:28]

The present invention provides a method for examining a cylinder liner, comprising a step in which the piston of an engine having an imaging device provided with an upper surface thereof moves within the cylinder that accommodates the piston, and a mop in which the imaging device images the inside surface of the cylinder liner which covers the inside surface of the liquid cylinder while the piston is moving within the cylinder or after the piston has finished moving within the cylinder.

[0029]

The present invention provides a holding tool that is configured to be capable of being disposed on the upper surface of the piston of an engine, said holding tool holding a jroagsng device which images the inside surface of a cylinder hnec that covers the inside surface of a cylinder thai accommodates the piston while obstructing the transfer of heat from the piston to the imaging device, (003¾ A configuration may also be adopted if the shove-described holding tool has a: d elastic body disposed between the upper surface 10031] A configuration may also be adopted using the above-described holding tool "haracfcers. symbols, or drawings indicating the direction of imaging by the imaging device in the imaging region of the imaging: device. , 100321 A copEgpraiion may also be: adopted with the above-described holding tool; logs: tfeaf support the imaging device: in a state of being separated from the: upper surface of the piston. (003¾ A configuration may also be adopted if the above-described holding tool has a rod-like body which is inserted into a reee »s provided on the upper surface of the piston, 10034! A configuration may also be adopted from the above-described bolding tool has a contact surface having a shape that engages with the shape of the upper surface of the piston. 10035]

The present invention provides a cylinder liner of an engine having an inside .upon, which a pattern occurs., Atleasi of the say, shape, and direction of said pattern changing according to the degree of wear, [00.30] A configuration may also be adopted if the above-described cylinder liner has recessed portions on Ih «? roside surface, at least one of the size, shape, and direction of said recessed portion changing m the radial direction of the cylinder. A configuration may also be adopted, in the above-described cylinder liner, the recessed portions are filled with a material having a color different to that of the main body. Also, a confration may also be adopted, in the above-described cylinder liner, a pattero occurs in a plurality of positions in the cylinder direction of the cylinder. 10039] A Configuration may also be adopted, in the above-described cylinder liner, g pattern oceuré ih apluMlty olposition in themovement direction ofth ¥ [»sten, [0040.] å c &amp; iifipiMtion reay also be adopted * ih. a 'different patten occurs in each of a plurality of positions, [FtYeem of the Invention] in 00 -111

According to the present invention, a clear image of the inside surface of a cylinder liner can be obtained without the need for a maintenance worker to open the cylinder cover or to eater the cylinder. As a result, the maintenance worker is able to easily and accurately evaluate the state of wear of the cylinder liner.

[Brief Explanation of the Drawings] [Fig. 1] FIG. 1 is a drawing illustrating the overall configuration of $ <-cyKhdeir Jiiaer examination system according to the first embodiment, [Fig, 2j Fig. 2 is a drawing illustrating a terminal device and imaging device according to the first embodiment, and devices related thereto, [Fig. 3) Fig. 0 is a drawing illustrating the basic configuration of an imaging device according to the first embodiment.

[Fig. 4] FIG. 4. is a drawing illustrating the positions of recessed portions provided by the cylinder liner according to the first embodiment.

[Fig. 5] FIG. 5 is a drawing illustrating 'the shape of the recessed portions provided by the cylinder liner according to the first embodiment.

[Fig 6] Figs. 6 is a drawing illustrating an image captured by the imaging device according to; thaw. the first embodiment, [lug. 7] FIG. 7 'is a drawing illustrating the basic configuration of a computer adopted gs fbe hardware of a terminal device according to the first embodiment.

[Fig. 8] FIG. S is a drawing illustrating the basic configuration of a computer adopted as the hardware of a server device according to the first embodiment.

[Fig. 9} Figs. 9 is a drawing illustrating the functional configuration of the terminal device according to the first embodiment.

[Fig. 10 is a drawing illustrating the data configuration of a wear management database stored in the terminal device according to the first-embodiments IFig. FIG. 11 is a drawing exemplifying the data eonfiguratioxi of as engine attribute database stored in the; terminal device according to the first enibodiment, [Fig. 2) Fig. 12 is a drawing illustrating the data configuration of a metsornlogyallariariie database stored in the terminal device according to the first embodiment.

[Fig. FIG. 12 is a drawing illustrating the data configuration of a navigation; schedule. : We «We: stored in the: tormiéat device aecording to the fifsC etoBItoffi®1®.

[Fig. 141 Pig. 14 is a drawing di uncrating ih "functional configuration of i: h" server device according to the first embodiment.

[Fig. 15] Fig. 1.5 is a drawing exemplifying a warning screen displayed on the terminal device according to the first embodiment.

[Fig. 16] FIG. IP is a drawing exemplifying an image · viewing screen displayed cm the terminal device according to the first embodiment.

[Fig, 17] FIG. 17 is a drawing illustrating the image * viewing screen displayed on the terminal device according to the first embodiment.

[Fig. 181 FIG. 1-8 is a drawing illustrating a deterioration-viewing screen displayed on the terminal device according to the first embodiment, [Fig. 19} FIG. 19 is a drawing exemplifying an odd wear verification screen displayed on the terminal device according to the first embodiment.

[Fig. 20] Fig. 20 is a drawing illustrating the external appearance of the imaging device according to a modified example, [Fig. 2l] FIG. 21 is a drawing illustrating the position of a recessed portion provided by the cylinder liner according to a modified example.

[Fig. 22] Fig. 22 is a drawing illustrating a state in which the holding tod according to a modified example is placed on the upper surface of the piston.

[Fig. 23] FIG. 23 is a drawing illustrating a state in which the holding toot atx; prdina to a modified example is attached to the upper surface of the piston.

[Fig. 24] FIG. 24 is a drawing exemplifying a temporal change viewing screen displayed on the terminal device according to a modified example.

[Fig. 25] FIG. 25 is a drawing illustrating the data configuration of an ipaiptpppsee wctfh: database stored in the terminal device according to a modified example.

[Fig. 20l FIG. 2b is a drawing illustrating the data configuration of a used fuel oil database stored in the terminal device according to a modified example.

[Fig. 27j FIG. 27 is a drawing exemplifying a screen displayed on the terminal device according to a modified example.

[Fig. 28] FIG. 28 is a drawing exemplifying a screen displayed on the terminal device according to modified example.

[Fig. 29j FIG. 29 is a drawing exemplifying a screen displayed on fhé terminal device according to a modify -d example.

[Embodimen t] 'MCtoil 1. Configuration

Fig. X is; a drawing illustrating the overall configuration of a cylinder liner ^ xaminafcioo system 1. according to the present embodiment. Cylinder liner examination system 5 is a system for supporting examination of a cylinder liner that covers the inside surface of the cylinder of an engine mounted on a ship: 10044]

Cylinder liner examination system 1 comprises a fe & muml device 11 disposed, on a ship 5. a server device 12 that performs data communication with terminal device 1.1 via a communication satellite 6, and a server device Id that delivers, to server device 12, meteorological'inai'ine data indicating meteorological and marine conditions ship 5 encounters during navigation. FIG. 1 illustrates one ship 5 and one terminal device Π, hut: the ntnnhers thereof are not limited to one. 100451 ip atiiiitipn to terminal device 11, an imaging device 14 which constitutes cylinder Jiner system "£ is mounted on ship 5. Fig. 2 is a drawing illustrating terminal device 11 and imaging device 14 mounted on ship 5, and devices related to terminal device ·;!.! and imaging device 14.

[0046!

Ship 5 comprises a plurality of engines (.drawing omitted). An engine usually has a plurality of cylinders 5.1, and fig. 2 exemplifies one of a plurality of cylinders 51. The top of cylinder 51 is open, and is usually covered with a cylinder cover 52. A large portion of the inside surface of cylinder 51 is covered by cylinder liner 55. Λ piston 54 is accommodated in cylinder 51. and piston 54 moves reciprocally inside cylinder 5] in accordance with the operation of the engine. Hereafter, the movement: direction of piston 54 is simply referred to as '' movement direction. '' Moreover, the circumferential direction of cylinder 51 or cylinder cover 52 is sirnplvpreferred to [0047]

Cylinder liner 55 serves to increase the slidahility of the reciprocal movement of piston 54, transfer the heat, the engine to promote cooling, increase the airtightness of cylinder 51, and the like. The inside surface of cylinder liner 55 causes abrasion in accordance with the reciprocal movement of piston 54. However, the life of the engine can be extended by changing the cylinder liner.

[00481

Cylinder 51 is provided so that a plurality of scavenging ports 511 pass through the side surface of slopes 54. said scavenging ports oil being arranged in the circumferential "direction, for example. As illustrated in Fig. 2. scavenging port 511 is disposed in a position close to the bottom of cylinder 51. However, in a state in which piston 51 has sufficiently moved to the bottom side inside cylinder ol, seayengmg ports 51.1 are positioned so as to be above the upper surface (for example, top surface) of piston 54. Hereafter, the position of pinion -We illustrated in Fig. 2 is referred to as "hnxie position." In the present application, when referring to the tnp / botiom of cylinder 5] or piston 54, the flame-contact surface side is the top side, [0049]

A tip. 2, imaging device Id is configured so as to be capable of being positively inaetiM *; tho upper surface of piston 54 via holding tool 7. FIG. 3 is a drawing illustrating the basic configuration of an imaging device 34. imaging device 5.4 comprises an imaging unit 3 41, a light emitting unit 142 that shines light on a subject during imaging, a control unit 143 that controls the imaging by imaging unit 5.41. and shining of light by light-emitting unit 142. a receiving unit 344 which receives: command data for command ap Image from an; external device, a storage unit MS t! M $ ipa ^ ge data indicating ..captured, images, and. a transmission unit 140 | m | ^; <i§ta to an external device. 10050]

Imaging unit 141 generates image data indicating a seamless panorama, image that covers the entire region of a hemisphere by a single capture. That is. when imaging device 14 is disposed in the direction indicated in fig. 2. the imaging region of imaging · unit 141 becomes the entire region above the upper surface of piston 5-1-.

[0051.1

Receiving unit 114 receives command data from terminal device H via a wireless access point (.drawing omitted), for example ', and delivers the command data to control unit 1-13. Control unit 143 causes imaging unit 343 to per form, magging and simultaneously causes light-emitting unit. 142 to emit light, according to <enmBtand data. Since imaging in cylinder liner exam system 1 is constantly accompanied by emission of light by light-emitting unit 342. Hereafter, the term "imaging" simply signifies imaging accompanied by emission of light by light-emitting unit 142, Image data: generated by imaging performed by imaging unit 141 is stored in storage unit 145 and transmitted to terminal device 11 by transmission unit 14G.

[0052]

Images captured by imaging device 34 include an image of the inside surface of cylinder 53, and an image of the bottom surface of cylinder cover 52, that is, an image of the flame-contact surface. Next, of the images generated by imaging device 14, the portion indicating an image of the cylinder surface liner 53 is referred to as "cylinder liner image data," and the portion indicating my image of the cylinder cover flame-contact surface 52 is referred to as "flame-contact surface image data," 'Iasi

Holding tool 1 m iforiped; from rubber, for example, and provides: Mat resistance,:; thermal insulation properties, and low heat transfer properties. Holding tool 7 has three or more legs. aad supports imaging 'device Id in a state of being separated from the upper surface of piston 54. The contact surface between holding tool 7 and piston 54 is small. Therefore, the heat from piston 54 does not easily transfer to imaging · device 14, Since holding tool 7 has high elasticity, piston 54 ami imaging device 14 are not easily damaged .eve) »when handled carelessly by a maintenance worker. Holding tool 7 does not need to be formed entirely of rubber, and a configuration in which a metallic frame is coated with rubber, for example, may be adopted. Another material may be used for holding tool 7 in place of rubber as long as the material provides heat resistance, thermal insulation properties, and low heat transfer properties.

[0054]

When examining cylinder liner: 5% a maintenance worker stops the engine, operates the contral device of the engine, and moves piston 54 to the basic position. Then, the .maintenance worker sets imaging device 14 on holding fool 7, and sunsequenily inserts imaging device 14 into cylinder 51 via a scavenging port 51; by using a grabbing tool, fur example, 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 direction. 100551

Then, the maintenance worker operates the control device of the motor arid moves piston 54 back and forth once within cylinder 51. During this time, imaging device 14 prfffmg imaging according to the command data transmitted from terminal device 11. and transmits the f operated image : data: to terminal device 11 ,,

Mrøii,

Then, the maintenance worker removes imaging device 1.4, set on holding tool 7, from cylinder 51 via one of the scavenging ports 511 using a grabbing tool, for example. Accordingly, a dear image of the inner surface of cylinder liner 53, imaged in a plurality of positions in the movement direction, can be obtained. 1: 0057}

While piston 54 is being moved back and forth once described above, terminal device 11 receives image data transmitted from imaging device 14 and crank angle data pertaining to piston 54 transmitted from a crank angl «measurement device 8. Crank angle iTieasu.rem.ent device 8 continuously measures the crank angle, and outputs crank angle data indicating the measured erank angles. Crank angle data received by terminal device 11 is used to generate position data indicating the position of imaging device 1.4, 1005S]

In addition: to crank angle measurement device 8, a measurement device that measures: various attributes of navigation performed by ship 5 is mounted on ship 5.

Hereafter. as indicated in its. 2, the collection of these measurement devices is referred to as the group of ineasureroent device. ··! 9. Group of measurement devices 9 includes, as "measurement devices that measure attributes that affect the wear of cylinder liner 52, devices: lhat. · Measure: .saæ &amp; ./ eel an engine rotation speed measurement device 91 ami an engine load measurement device 92, devices that measure attributes pertaining to metcorulogicai / marine conditions such as wind speed / wmd direction measurement device 93 and tide speed / tide direction -.ftie $ 8Ui.vment device 94, devices that measure attributes pertaining to ship speed such as a groundspeed calculation device 95 and a log speed calculation.device 96, and the like, for example. Measurement devices included in group of measurement devices 9 transmit attribute data indicating measured attributes to terminal device 1.1, Each type of attribute data received by terminal device 11 is used: te: esti m ate the degree of wear of cylinder liner 58, and the like, [0059]

Cylinder liner examination system 1 includes a function for specifying the degree of wear of cylinder liner 53 using image data generated by imaging device 14. To specify the degree of wear using image data, a large number of conical recessed portions 531 having the radial direction of cylinder liner 53 as the rotational axis are provided on the inside surface of cylinder liner 53 in. the present embodiment, Pig, 4 is a drawing illustrating the positions of recessed portions 531 provided to cylinder liner 53 as "O." [0060]

In: the example shown in tig, 4. recessed: portions 531 are. arranged on the: intersections between four straight lines along the movement direction arranged in positions that: are set apart from each other by 90 degrees in the circumferential direction of cylinder liner 53, and six lines (circles. * arranged in the circumferential direction at equal however, the number of recessed portions 531 and intervals thereof are not limited to those exemplified in Fig. 4, and are determined, as appropriate, from the sixth of cylinder liner 53 and the like, 1: 0961}

As illustrated in a tig. 5, each recessed portion 531 has a conical shape in which the diameter decreases from the inner surface to the outside surface of cylinder liner 53. Accordingly, the diameters of the openings of recessed portions 531 become smaller as the wear of cylinder liner 53 advances . Therefore, the degree of wear fif cylinder liner 53 is accurately specified based on the diameters of the recessed portions 531 in the images thereof indicated by the image: data generated by imagmgidevtce 14, [0062]

Pig. fi is a drawing schematically illustrating images nf cylinder liner 53 captured by imaging device 14, which is a region adjacent to the upper surface of piston 54 during jroagsng · (region «η which i'n;> image is clear) is cut out in a strip shape, and an image nf the flame-contact surface is cut out. FIG. fi (aj illustrates an image captured by imaging device 14 near the bottom of the cylinder, fig. htbf illustrates an linage 'captured by imaging device 14 near the middle section of cylinder 51, and fig, 6 ( c) illustrates an image captured by imaging device 14 near the top of cylinder 51. As illustrated in Fig. 6, the closer the imaging position is to the top of cylinder 51, the greater the image of the ilame'eqnteetisurihce is, "[dues]

The hardware configuration of terminal device 1.1 is a general computer for a terminal device, for example. FIG. 7 is a drawing illustrating the basic configuration of a computer IQ adopted as the hardware of terminal device 11, Computer 10 comprising: a, memory 1 (31 that - .. stores-uttritnis. Types of date,: a .. processor 102: that perforins various types of data processing according to a program stored in memory 10: 1, a communication interfaces lOd, which is an interface that performs data communication with other devices, a display device 1 () 4. such as a liquid crystal display, which displays images to a user, ami an operation device '105. such as a keyboard, which receives an input operation by a user. An external display device connected to computer 10 may be used in place of or in addition to display device 104 which is built into computer 10. Furthermore, an external operation device connected to computer 10 may be used in place of or in addition to operation device 105 Fnat is built into computer 10.

I

The hardware: epuflguration., Of server device 12 and server device 15 is a; general computer for a server device, example. FIG. 8 is a drawing illustrating the basic configuration of a computer 20 adopted as the hardware observer device 12 or server device: 13. Computer 20 comprises a memory 201 that stores various types of data, a processor 202 that performs various types of data processing according to to a program stored in memory 201, and a coimmmicafiun interface 203 that performs data oommuiiicatiou with other devices. 1: 0055}

FIG. 9 is a drawing illustrating the functional configuration of terminal device 11. That is, computer 10 operates as a device comprising the configuration illustrated in fig. 9 by performing data processing according to a terminal device program 11. Following is an explanation of tile functional configuration provided by terminal device 11, 10000] A timing means Π0 generates time data indicating a current fine. A position data acquisition means 111 receives crank angle data: from crank angle measurement device 8 and generates position data indicating the position of imaging device in the movement direction rising crank angle data. jødi ?!

Position data acquisition means 111 specifically the position of imaging device 1.4 in tin? movement direction corresponding to tire crank angle, that is. the position of the upper surface of piston 54, using a predetermined calc illumination formula or conversion table that uses the crank angle indicated by (he crank angle data as a variable, for example. Since the position of imaging device 1.4 is uniquely determined by the crank angle, the crank angle data may be used as is. as position data. 10068]

Oonunand means 312 transmits, to imaging device 14. command data instruction imaging, when position data acquired by position data acquisition means 111 indicates a predetermined position. The position of imaging device 14 at which command means transmits command data is determined as a position such as that in which the entirety of cylinder liner 53 is covered when the portions of images captured by imaging device 1.4 in those positions in which cylinder liner 53 is clearly imaged, cut out in strip shapes, distortions are corrected, and the strips are joined together in order. Image data acquisition means 1 id receives image data transmitted from imaging device 1.4. S00691

Mfi'ihatte 'data acquisition means 114 receives attribute data from each of the measurement devices included in group of measurement devices 9. Attribute data acquisition means IN acquires attribute · data input by a maintenance worker or the like, and receives attribute data transmitted from server device 12. The attribute data input by a maintenance worker or the like is data indicating attributes that are not measured by group of measurement devices 9 of the attributes of navigation of, ship 5, such as the type of fuel ml 'used in the engine . Attribute data transmitted from server device 12 is meteorological / marine data indicating mefenrological or marine conditions predicted to be encountered by ship during future navigations, for example, 10070!

Wear * specifying means 115 specifies the degree of wear of cylinder liner 53 using image data acquired by image data acquisition means 113, and generates wear data indicating the specified degree of wear. In the present embodiment, the thickness (pm; of wear from the initial state of cylinder liner 53 is used as an indicator representing the degree of wear of cylinder liner 53, Hereafter, this thickness is referred to as "'wear amount." The thickness of wear from the initial state of cylinder liner 53 is one example of an indicator representing the degree of wear of cylinder liner 53, and one of many other indicators may be adopted as an indicator representing the degree of wear of cylinder liner 53, For example, an indicator such as the weight ig / nfd of worn material per unit surface area of TV-inside surface of cylinder liner 53. the wear amount (pm / kWl per unit load, the wear amount iumdime) for unit navigation tune, or the like ttiai bdhked as an iiidicator tfest represents the degree of wear of c vander Ha er 53. 1 () 07]}

Tramunission means 116 transmit s *, to server services: 12, attribute data acquired by auribute data acquisition means 114, and wear dafa generated by wear-specifying means 115. Relationship data acquisition means 117 receives, from server device 12, relationship: data indieatiafAit, srolation8Mp :: h! atv?! ^ en. '' at ^ rihutes pertaining to navigation of ship 5 and tlm wear amount of cylinder liner 53, [0072}

Wear.-estimation means 1.1.8 estimates the wear amount of cylinder liner 53 using the attribute data acquired hy attribute data acquisition means 11.4 and the relationship :: data acquired hy relationship data acquisition nieans 117, and generates estimated wear data indicating the estimated wear amount {hereinafter referred to as "" estimated, wear amount "), [0073]

Notification means '19 performs a predetermined notification to a maintenance worker or the like: · when the difference between the estimated wear amount · indicated he estimated wear data generated by wear estimation means 118 and the wear amount indicated bv wear data generated by wear-specifying means 115 with reaped to cylinder liuer 53 at a given timing satisfies predetermined conditions.

[007-1]

Storage means 120 stores various: types of data, as Indicated below. Look, 10 is; a, drawing exemplitying the data, configuration ;: of · a: wear mpnageBieut: database stored in; storage pieaps 120. The wear management database is a database for managing the wear amount specified primarily from images captured by imaging device 14.

[0075]

Thy wear management database includes a data table pertaining to each of the cylinders 51 provided to an engine mounted on ship 5. The data fable of the wear management database is a collection of data records pertaining to each of the images captured by imaging device 14. The data table of the wear management database has the following fields (.names of Helds are shown in square brackets): [imaging tune! that stores time data indicating the capture times of the images, [imaging position} that stores position data indicating the imaging position in the movement direction, [image! that stores: image data, [wear amount! that stores wear data indicating the wear amount of cylinder liner 53 spec-hied from images,: and [estimated wear amount! that: stores estimated Wear data indicating the: »tjhe times.; qf capture: of the images.

[() 976} Κ ^; <; ϊί. -iaf fwéét *? · .dfeotwit! and [estimated weir amount! had the sdb ^ tfel data fields Iftref direction], [second direction]. ·, Lath direction], However. ] n] represents the number of recessed portions no 1 (refer to fin. 4) in the circumferential direction, a route in the example in fig. 4, n-4. The (first direction), [second direct ion 3. .... infix direction! Correspond to each of n recessed portions f> 3! In the cireu mferexi tial direction of cylinder liner The [first direction !, [second direction] , ..., [nth direction! which are the sub levels of [.wear amount] store wear data indicating wear amount specified from the size of images of corresponding recessed portions 5 <ii. Hie ffirst direction !, [second direction], .... [nth direction] that are the sub levels of (estimated wear »mount! bulk; estimated wear data indicating the estimated wear amount calculated using attribute data pertaining So navigation after the previous imaging timing and relationship dafa, using, as a reference, the wear amount specified fmpB: the images of recessed portions; .531 1¾ same imaging position at the

Imaging: timing before the imaging timing of fhe; data reaped, thereafter referred to; as: "previous imaging timing"

Fig, Π is a drawing illustrating the data configuration of at; engine attribute database stored in. storage means 120. The engine attribute database is a database for managing attribute data indicating attributes pertaining to past driving of an engine, LOOTS]

The engine attribute database includes a table: a table pertaining to each of the engines mounted on ship 5. The data table included in the engine attribute database is a collection of data records corresponding to each measurement period. The data table of the engine attribute database includes [roeasnreraenfc period], inlet rntetfon speed], [engine: load !, [air intake temperature], [exhaust gas temperature], [cylinder oil furnace], and the like.

[0079]

FIG. 12 is a drawing illustrating the data configuration of the meteorological / manne database stored in storage means 120. The mofeorologkal / manne database is the database for managing attribute data pertaining to meteorological or marine conditions encountered by ship 5 in the past and meteorological or marine conditions predicted to be encountered by ship 5 in the future. tooscil

The meteorological / marine database includes a data record corresponding to each of the measurement periods pertaining to past meteorological or marine conditions, and a data record corresponding to each of the prediction periods pertaining to future meteorological or marine. ' conditions. The data record pertaining to the future meteorological. or marine conditions included in the meteorolopcal / mrine database is updated with new meteorological / inarine data received by terminal device 11 from server device 13 via server device 12. an ad data: '^^ ϊίί8:'. | !! ^ '|> efiod 3 $$ $$$$ &amp; &amp;, [nos 11

Each of the data records of the meteovolugicai / marble database included [m & asurfement period] thai stores data encoding the measured period or predicted period, [wind speed], [wind direction], [tide speed], [tide direction !, [wave height !, and the like.

[0082]

The above-described engine attribute datahast »and meteorological / marine database are examples of databases for managing attribute data stored in storage means 120. Storage means 120 may store, for example, a database for managing aitribute data pertaining to the trim, a database for managing attribute data pertaining to ship speed, and the like. 10083!

Fig. 1 | is a .drawing exemplifying the data configuration of a navigation schedule table: stored In storage · means 120 .. The .avi ^ iipn schedule table stores data indicating future navigation schedules of ship 5. The navigation schedule table includes [port / navigation segment] that Mores data indicating a port at which ship 5 calls nr a navigation segmentCs), and [period] that stores data indicating the period during which ship 4 is moored at your port or the period during which ship 5 navigates a navigation segment.

[0084!

FIG. 14 is a drawing illustrating the functional configuration of server device 3.2. In Thai, computer 20 operates as a device comprising the coo lign ration illustrated in fig, 34 by executing data processing; according to a: server device program 12. Following is an explanation of the functional configuration provided by server; device 42.

[0085]

Attribute data acquisition means 121 receives, from terminal device II, attribute data indicating from rib Dies of navigation performed in the past by ship 5. When there is a plurality of ships 5, attribute data acquisition means 121 receives attribute data from terminal device 11 mounted on each of the plurality of ships 5.

[0086] A wear data acquisition means 122 receives wear data from terminal device 11. A relationship data generation means 123 generates relationship data indicating the relationship between attributes and wear amount using attribute data acquired by attribute data acquisition, means 121 and wear data acquired by wear data acquisition means 122. For example, relationship data generation means 123 obtain a relationship formula that uses tun wear amount as a target variable and each type of attribute as an explanation variable by means of regression linaiysis by using attribute data and wear data, and generates: relationship data indicating the obtained relationship formula, For the generation of relationship data, in addition to attribute data and wear data pertaining to the target ship δ. wear data portfolio to a different ship 5 of the same type a &amp; the target, ship 5 may be used. 10087! A storage means »124 sMSeS vaiimis types of data, as described below. First, storage means 124 large · «a database iW managing attribute data acquired by attribute data acquisition means 121. The database for managing attributes data stored in storage means 124 is similar to the database exemplified as the engine attribute database (refer to Fig. If ) Or meteorological / marine database (refer to Fig. 12) stored in storage means 1.20 of terminal device 11. Storage means 124 stores a database for managing primarily wear data acquired by wear data acquisition means 122. The data base: for managing the wear data stored; in storage means 124 is similar to t he wear management database the te te: åg. 10} stored in storage means 12: (1 of terminal .device 11. If there is a plurality of ships 5, these databases starred in storage means 124 manage data pertaining to the plurality of ships §, [0088]

Storage means 124 stores a duplicate of the navigation schedule table (refer to fig. 121 stored in storage means 120 of terminal device 11. If there is a plurality of ships 5, storage "means 124 stores duplicates of navigation. Schedule tables pertaining to the plurality of ships &amp; it A request, means 125 requests * .fr »». server device id, metoocologicalharme data indicating meteorological or marine conditions predicted to be encountered by -ship 5 during future: navigation, MeteotologicaFmarme data acquisition means 126; metoorplogieal / marine data transmitted from server device 13 in accordance .: vritlpa request: from request means 125, [OOØOi

Transmission means 127 transmits, to terminal device 11., relationship data generated by relationship data generation means 1.23, Transmission means 127 transmits. i: o terminal device 11, meteorological / marine data acquired by meteorological / m & rme data acquisition means 120.

[0091}

Since the functional configuration of server device 13 is similar to the functional 60iifigirrati (> n of a general server device that delivers data to a request source according to a request, explanation thereof is omitted.

Blest, operation or cyliodérliiie ^ éicaifuinatio »system 1 is explained. First, in cylinder liner examination system i, terminal device 11 continuously updates: a database for managing attribute data exemplified by the engine attribute database (refer to fig, 11> or the metearologicaJfmarine database tuder to fig. 12) with attribute data received from groxip of measurement devices 11. Terminal device 11 centuously updates the navigation schedule table (refer to fig. 38) according to the current time or change in the current position of ship 5, Terminal device 11 sporadically updates these databases or tables according to daiaunput operations by a maintenance worker or the like, [0093)

Terminal device 11 transmits stored attribute data, "" ear data, and the like at a predetermined frequency, for example. Server device 12 updates stored databases with these items of data transmitted from terminal device II. Server device 12 generates relationship data using; the stored attrihute. data and wear data at a: predetermined frequency, for example, and; transmits the relationship data to terminal device 11. As a result, terminal device 11 ctm periqdieally [0091] A maintenance worker performs an operation for capturing an image of cylinder finer, 53 · ft suitable frequency by utilizing the time during which the engine is stopped. Specifically, the maintenance worker operates the control device of the motor i: o move piston 54 to the basic position, and subsequently places, on the upper surface of piston 54, imaging device 14 set on holding tool 7. Then, the maintenance worker operates the control device of the motor to move piston 54 back and forth once within cylinder ol. 10095)

While piston 54 is being: moved bock and forth once within cylinder 51, terminal device 11 transmits command data to imaging device 14 each time the position of imaging device 14 reaches a predetermined position in the movement direction of cylinder liner 53. Imaging device 14 performs imaging in accordance with command data, and tiaosmits the generated image data to terminal device 11, [0096)

Terminal device 11 receives image data from imaging device 14, and stores the image data with the wear management database (refer 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 by the received image data, and stores the wear data in the wear data management database, vo097l.

When hfeW wear data is generated, terminal device 13 substitutes the wear amount at the previous imaging riming and attributes indicated by attribute data pertaining to the. period from the previous imaging timing to the present time in the relationship formula-indicated by the relationship data, and calculates an estimated wear amount. Tenninal device 1.1 stores, in the wear management database, estimated wear data indicating the; ounulated estimated vw-ar amount. jøæei

Ti? Wonaj device 11 detects the possibility of abnormal wear according to whether or not the difference between the estimated wear amount indicated by the newly generated estimated wear data arid wear amount indicated by wear data stored in the same data record satisfies predetermined conditions. Whether or not a value obtained by dividing the difference between the wear amount and the estimated wear amount by the integrated value of the engine's total rotation speed from the previous imaging timing to the present time is below a predetermined threshold value is used again as a predetermined condition used to defect lb «possibility of abnormal wear by terminal device 11. However, this condition is merely an example ,, and other conditions may be adopted, such as whether or not the difference between; the wear amount and the estimated: wear amount is below a predetermined threshold value ,, whether or not a value obtained by dividing said difference in the integrated value of the navigation distance from the previous imaging timing to the present time is below a predetermined threshold value , and the like.

[0099]

When the possibility of abnormal wear of any of the cylinder liners 53 is detected. : terminal device 1.1 displays the screen (hereinafter referred to as "warning screen") exemplified in fig. 15. and notifies a maintenance worker. If the maintenance worker operates the "image view" button on the warning screen, terminal device 11 displays the screen (hereinafter referred to as "image-viewing screen") exemplified in Fig. 16. The image-viewing screen displays, in a row, the most recent image of a cylinder liner for which the possibility of .abnormal wear was detected, and The front view and upper stadaeo view of cylinder finer 53 displayed in region Λ01 of the io i & ggrvfewjbagrøee & vhayg: displayed in color the portion currently displayed on the image-viewing screen from among all regions of the cylinder liner 53, and the portion in which the possibility of abnormal wear was detected. 10100] A maintenance worker is easily able to confirm, on the image-viewing screen, the past and current state of the inside surface of cylinder liner 53 for which the possibility of abnormal wear was detected. The maintenance worker is also able to operate terminal device 11 to display other portions of cylinder liner 53, enlarge or reduce on image, and display a past image. Thu image "viewing Sferfeen.is not only dispiayedby operation of the" image view "button on the warning screen, but also when a predetermined operation is performed On terminal device; 11. liøil A.maintenance worker is able to display past and current images of the itame'eontaei Surface. pn terminal device 11 by operating the "flame" contact surface "button on the image * viewing screen. FIG. ST is a drawing exemplifying the image'viewmg screen in a .nai: o in whseh an image of the flame'contact surface is displayed. An exhaust valve, a fuel valve, and the like are arranged on the flame "contact surface. Accordingly, the maintenance worker is able to confirm the stale of the exhaust valve, fuel valve ·, and the like on the image - viewing screen and judge a suitable maintenance timing and the like of these devices. Deposits of carbon, known as carbon flower, often adhere to the vicinity of the tip of the fuel valve. the maintenance worker is able to confirm the state of car! ion flower on the image'viewing screen illustrated in fig. 17 and obtain information pertaining to the states of fuel combustion, lifll

Moreover,. ^ Maintenance worker is aide: to: display; a terminal device: 11, the screen thereafter referred to as' 'temporal change viewing: screen'! exemplified in fig, IS by operating the "temporal change view" button on the image'viewing screen. The: temporal change viewing screen displays ,, on a graph, the temporal change of past wear amounts and future estimated wear amounts pertaining to a target portion of cylinder liner 53, Concerning a period during which a navigation schedule is indicated in a navigation schedule table , terminal device Π calculates the estimated wear amount when navigation is performed according to a navigation schedule using relationship data and future attribute data, and displays the estimated wear amount on a graph on the temporary change viewing screen. Considering a period during which a navigation schedule is not determined, terminal device 11 calculates the estimated wear amount when navigation is performed in a pattern similar to a past pattern, for example, using relationship data and past attribute data, and displays the estimated wear amount on a graph on the temporal change viewing screen. Tire maintenance worker is easily able to know the desirable replacement timing of cylinder liner 53 from the graph displayed on the temporary change viewing screen. 10103]

Moreover, a maintenance worker can display, on terminal device Π. the screen (hereinafter referred to as "uneven wear vinification screen") exemplified in fig. 19 by operating the "odd wear confirmation" button on the image * viewing. Screen. The odd wear verification screen displays, as a graph, change in wear amount in the movement direction for each of the imaging directions. The maintenance worker is easily able io known the extent, of odd wear of cylinder liner 53 from the graph, on the uPPVeh Wéai · 'Verification screen.

[01041

As described above, aceording: to eylinder liner examination system 1, a maintenance; worker is easily able to: view · and aceumtelyeyaluate the "state of-wear of cylinder liner 53, [0105)

In addition, according to cylinder liner examination system 1. a maintenance worker 'easily' had to confirm the state of the exhaust: valve, fuel valve, or the like arranged on the • flame 'contact surface. Moreover, according to cylinder liner examination system 1. a, maintenance worker is able to confirm the state of carbon flower adhered to the flanur 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 cylinder liner examination system 1 makes possible confirmation of the state of carbon flower, which was difficult in the prior art, deserves special mention here, | 0! Ob! [Modified Examplej

The abovtcdescrihetl eufoedintent may bo modified ^ in various: ways within the technical concept of the present invention. Examples of such modifications. ^ C.iiidie ^ lgd .; below. Two or more of the below modified examples may be combined.

[0107] (1) In the embodiment described above, imaging device 14 comprises imaging unit 141 which seamlessly captures a panoramic image of the entirety of a hemisphere; instead, a configuration may be adopted while imaging device 14 comprises a plurality of imimagmg tmils 141, and an image that covers a 360'degree imaging region in the circumferential direction of cylinder liner hd by joining images captured by the plurality of imaging units 141. FIG. 20 is a drawing exemplifying the external appearance of imaging device 14 according to trie, present modified example. The arrow shown in fig. 20 indicates the imaging direction, imaging device: 14 exemplified in FIG. 20 comprises; fivi · imatting units .141 in which the; viewing angle in the horizontal direction is approximately 1 no degrees. Four of these: imaging; units 141 are arranged so that tire imaging direction is radial, at 90 degree intervals. The remaining imaging unit 111 is arranged so that the imaging direction is vertical. Control unit 140 generates cylinder liner image data by joining images captured simultaneously by the four imaging units 1 11 arranged radially, imaging unit 141 in which the imaging direction is vertical generates fLanureoatact surface image data.

[0108] (2) In the embodiment described above, imaging device 14 performs imaging according to command data transmitted from terminal device 11. Instead, a configuration is adopted, which imaging device 14 performs imaging each time a predetermined time period has elapsed. In this modified example, iniagiug device 14 performs imaging without receiving røihihopaA - -dat », and -transmits the generated image data to terminal device 11. Terminal device 11 receives image data from 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 associating- the position data with the image data. immi] (3> In the emb! lines !: described above, position dai: an acquisition means! 11 of terminal device 5.1 generate *, position data using a crank angle. The method with which position data acquisition Méar.s 11! generates position, data is not limited, thereto

For example, a configuration may adopt adopted position data acquisition means111 generates position data based on the distance: between the upper surface of piston. 54 and the tinme'contact, surface ø cylinder caver 52. In such a case, 'eviinder liner examination system X comprises s range-finding means that is configured so that we are capable of being disposed. the upper surface of piston 54. and that measures the distance between the: upper surface of piston 54 and the flamemontact surface of cylinder cover: 5¾ and generates movement direction distance data indicating the measured distance. Position data acquisition: means 111 generates position data using movement direction distance data generated by a range'finding means. A configuration in which imaging device 14 comprises a range'finding means may be adopted.

[mil j A configuration may be adopted where position data acquisition means. 115 genera less position data based on the atmospheric pressure in piston 54. In such an oasis, cylinder liner examination system I comprises an atmospheric pressure measuring means disposed on the upper surface of piston 54, ami that measures the atmospheric pressure within piston 54 and generates atmospheric pressure data indicating the measured atmospheric pressure :, position data acquisition; means TTT generates position data using atipaspheric pressure data generated by the atmospheric pressure measuring means, ®112] A configuration may be adopted, whereas position acquisition means 111 generates position data by using flame-contact surface image data. In such a case, position data acquisition means Hi specifies the position of imaging device 14 in the motion direction based on the size of an image of the flame "contact surface indicated by the flame" contact surface image data, and generates position data indicating the specified position.

[mis] A configuration may be adopted, whereas position data acquisition means 115 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 arranged, "the shapes of recesset! Portions 531 are not limited to cones, and are formed into triangular pyramid shapes, square pyramid shapes , and the like, and the cross section of the spindle is formed into a star shape, an arrow shape, or the like. Position data acquisition means 111 specifies the position of imaging device 14 in the movement direction based on the shape, direction ami the like of an image of recessed portions 531 iodicated'h ^:% ii) ftde ^ 'l | iie) P' image data, and generates position data indicating the specified position, 100 41 (4) in the embodiment described above, terminal device 11. associates image data generated by imaging device 14 with position data acquired by position data acquisition means 111. Instead, imaging device 14 may associate the image data with the position data. on data acquisition means • 111 associates image generated data imaging unit 141 with position data acquired by position data acquisition means ill, and subseqxienfcly transmits the associated data to terminal device 11. 10115]

Cd) In the embodiment described above, it is assumed that imaging device 14 is disposed "in the correct direction on the upper surface of piston 54. That: is, when imaging device 14 is disposed in an incorrect, direction, it becomes unclear which portion of the image indicated by "the cylinder liner image data indicates which portion of the actual cylinder liner 53. Accordingly, a configuration may be adopted for cylinder liner examination system 5 • comprises a direction data acquisition means that acquires direction data indicating the imaging direction or imaging device 1-4.

[0116]

For example, a configuration must be adopted where the direction data acquisition means generating direction data by using ilaniemojitact surfer image data. In such a case, the direction data acquisition means generates direction data based on the: position of an image of a structure such as a fuel valve ihebudeci! ». jtfee it »iigs · of the Oamemontael surface indicated, by the flame`content gurfsye image: data.

[0117] A configuration may be adopted as the direction data acquisition means generates direction data by using cylinder liner image data. In such a case, the .shape, direction and the like of the cross section of recessed portions 5.31 provided, to cylinder liner 53 are made different according to the circumferential direction. The direction data acquisition specifically means the imaging direction based on the shape, direction and the like of the image of recessed portions 53! indicated by the cylinder liner image data, and generates direction1 data.indicating the specified direction, [0116! A configuration may be adopted with characters, symbols, or drawings indicating • the. imaging direction are provided to holding tool 7. That is. in a state in which imaging device 14 is set on holding tool 7, characters, symbols, or drawings indicating the imaging direction are provided in suitable positions on holding tool 7 so that the characters, symbols. or drawings indicating the imaging direction are reflected in the imaging region of imaging device 14. As such, as long as holding fool 7 is positioned in the correct position on the piston surface of piston 54, the imaging direction can be specified based or. the characters or the like reflected in the image. Ο 1191 (6) A configuration may be adopted for cylinder liner examination system 1 comprising a correction means for correcting distortion of cylinder liner image data. For example, when imaging device 14 is disposed at a point offset from the center of the upper surface of piston 54, the image of the cylinder liner raptured by imaging device 14 has an uneven scale due to its position in the circumferential direction. The correction means correct the cylinder liner image data so as to even put this odd scale .; j.0120]

For example, imaging device 14 measures the imaging distance pertaining to each plurality of imaging directions, that is, the distance from imaging unit 141 to the inside surface of cylinder liner 53, and generates imaging distance data indicating the measured distance. The correction means corrects the cylinder liner image data by using the imaging distance data generated by imaging device 14.

Furthermore, a configuration may be adopted where the correction means corrects the cylinder Voter image data by using flame-contact surface image data. In such a case, the correct ion means specific distortion in an image indicated by the cylinder liner image data based on distortion in an image of the flamei ontact surface indicated by the fi &me; contact surface: image data, and eorrpefs the cylinder liner image: data such as to eliminate the specified distortion, jo 122 | (?) In the embodiment described above, server device 1.2 generates relationship data indicating the relationship between attributes and wear amount by means of factorial analysis. The method for generating relationship data is not limited to factorial analysts. For example, other methods may be adopted for generation of relationship data, such as a method of obtaining an approximation formula that approximates the relationship between the wear amount and find the integrated value of the engine rotation speed at which a weighting correspondin.g to the engine load is multiplied. | 0I.23 | (3) Recessed portions 531 provided to cylinder liber 53: may be filled with a material thereafter referred to as "filling material") -wiffe-a color different to that of the rnateriai. of cylinder liner 53. In such an ease, after forming cylinder S3 comprising recessed, portions 531 is: complete, recessed portions 531 tire filled with a filling material. Then, the inside surface of cylinder liner 53. which has been filled with the filling material in recessed portions 531. if «polished. Due to the «« steps. a cylinder liner 53 having little unevottbess, slidahility; and airtisddoess on th «inside surface is obtained. 1 () 1241

In a modified example in which cylinder liner image data is used to specify the position of unaging device 14 in the movement direction, a filling material having a different color in the movement direction may be used. In such a case, even if the shape or direction of the cross sections of recessed portions 531 are the same in the movement direction, the position of imaging device 14 in the movement direction can be specified hv the color of the filling material. 101251

Moreover, in a modified example in which cylinder liner: image data is osed to specify the imaging direction, a © ling material having a different color in the circumferential direction may be used, in such a case, even if the shape or direction of the cross sections of recessed portions 531 are the -same in the circumferential direction, the imaging direction can be specified by the color of the filling material.

[0126! (9) The shape of recessed portions 531 provided for cylinder liner 53 is not limitedM a spindle shape, and may have any shape as long as the shape Iras a cross section in which at least one of the size, shape, and direction changes according to the advancement of went In a modified example in which recessed portions 531 are filled with a filling rootesmi a configuration in which the color of the filling material changes according to the advancement :: of wear by laminating a plurality of thisTerent'colored filling materials may be adopted. In such a case, the cross section of recessed portion 531 does not necessarily need to change, according to the advancement of wear. That is. The configuration of cylinder liner 53 is apt as long as the inside surface of cylinder liner 53 generates a pattern in which at least one of the size, shape, and direction changes according to the advancement of wear, 10127] (.10) The embodiment described above provides a plurality of recessed portions 531 provided with cylinder liner 53 provided on the intersections between a plurality of straight lines extending in the direction of movement and a plurality of circles provided in the circumferential direction. . The arrangement of recessed portions 531 provided to cylinder liner 53 is not limited thereto. For example, a single recessed portion 531 may be disposed of at a representative point. Alternatively, a plurality of recessed portions 531 may be arranged in a row so as to form a spiral on the inside surface of cylinder liner 53. Groove · like recessed portions 531 may be adopted. FIG. 21 is a drawing illustrating the positions of recessed portions 531 on cylinder liner 53 comprising'recessed portions 531. As illustrated in FIG. 2Ha), a plurality of recessed portions 531 extending in the direction of movement may be provided on the inner surface of the cylinder liner off As illustrated in fig, 2iib). a plurality of recessed .portions 531 that: Corns a circle in the eircumfm-eniud direction may be provided on the inside surface uf cylinder liner 5d. The shape of the cross section when a groove · like recessed portion 531 is cut in the longitudinal direction on a vertical surface is a V’shape, for example, [0128] (11) In the embodiment described above, holding fool 7 has a plurality of legs, and the tips of the legs come into contact with the upper surface of piston 54. instead, a • configuration in which holding tool 7 has a contact surface that has a shape that engages with the shape of the upper surface or piston 5-1 may be adopted. FIG. 22 is a drawing • 'schematically illustrating a state in which holding tool 7 having a contact surface engaging with the recesses and protrusions of the upper surface is placed on the upper surface: of piston 54 having recesses anti protiaisipns. According to this modified example, a maintenance worker is easily able to position imaging device .1.4 in a set position on the upper surface of piston 54. 101291 (12) A screw hole used when extracting piston 54 from cylinder 51 is sometimes provided to the upper surface of piston 54. A configuration in which holding tool 7 has a rod-like body which is inserted into the recess when piston 54 has a recess such as a screw hole on the upper surface may be adopted. FIG. 23 is a drawing schematically illustrating a state in which holding too) 7 according to the present modified example is .attached to the upper surface of piston 54. According to this modified example, even if the axis of cylinder 51 is inclined with respect to the verticabdireclion, before example, imaging device 14 does not become offset from the set position on the upper surface of piston Si, The rod-like body provided by holding too! 7 exemplified in rig. 23 is not provided with a screw thread. Instead, a configuration may be adopted in which holding tool 7 is provided with a rod-like body into which a screw thread is cut, and the rod'like body is inserted into the .screw thread (recess.) By means of the rod-like body being screwed into {the screw hole provided u> the upper surface of piston 54. 1: 01301 (13) In the embodiment: described above, terminal devices will detect the possibility of abnormal wear based on the difference between the estimated wear amount and the actual wear amount, in place thereof, or in addition thereto, 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 may be adopted. FIG. 24 is a drawing illustrating the temporal change viewing screen displayed by terminal device Si. in this modified example, when the rate of change in no amount changes signifnantiy, a maintenance worker oi the like is notified of the ^ possibility of abnormal weat The rate of change ip: wear amount is a value obtained by dividing the change amount of the wear amount by the attributes of the main cause (s). For example, the integrated value of the engine rotation speed (for example, a value obtained by multiplying a weighting corresponding to the engine load), the integrated value of the navigation distance (for example, a value obtained by multiplying a weighting corresponding to the engine load), the integrated value of the navigation time, and the like may be adopted, 10131] (14.) The method for using images captured hv imaging device 14 is not limited to that indicated in the embodiment described above. For example, images captured by imaging device 14 may be used to enable a maintenance worker or the ship to easily use the insight of a specialist such as a technician of the engine manufacturer. Specifically, the data field [evaluation] is provided to the, data table of the wear management database (refer to fig. 10) stored in server device: 12, for example, Ser \ arr device 12 comprises an evaluation data, acquisition: inpaps for acquiring; evaluation data indicating ev ^ lpa || ops:% the: stale of the inside surface or flame-contact .surface of cylinder finer 53 he interpreted o specialist by viewing an image. Evaluation data acquired by the evaluation data acquisition means is stored in the wear management database. If a maintenance worker operates terminal device 11 and specifies an image of cylinder liner 53 or the flame contact, surface for which evaluation is obtained, terminal device 11 transmits image data of the specified image to server device 1.2, server device 12 stores image data - iMieat & ijg similarities with image data tcansnniied from terminal device Γ.Ι, arid includes an .extraction means extracting, from the wear management database, a data record that, stores evaluation. data. Server device 12 transmits, to terminal device 11, the image data and; evaluation data of the extracted data record, Terminal device.,! X displays, to; 'the maintenance; worker, thecotttents of the image data evaluation data transmitted from server deviee: 12, 101,321 (15) Images captured hy imaging device 1-1 sometimes indicate damage (abrasions, coitus ίση. etc.) to cylinder liner ho. A configuration may be adopted in which terminal device 11, for example, extracts data thai is useful for specifying the cause of the abnormality and notifies a maintenance worker no like ship 5 of the data according to the detection of damage to cylinder liner 53 ,

In this modified example, attribute «data acquisition means of) of terminal device 1.1 acquires, with addition to the attribute data acquired in the embodiment described above, all data pertaining to maintenance work performed in the past on ship 5. attribute" data pertaining to the: .fuel oil used in the post by ship 5, or this like, for example, us attributes data indicating the attributes of navigation performed in the past which is useful for specifying the cause; of damage to cylinder liner 53, These items of attribute data may be data input by a maintenance worker or the like of ship 5. or data generated by a device such as a control device that controls 3 switching valve that switches & fuel tank that accommodates fuel oil supplied to the engine, for example jm: t4l

Attribute data acquired by attribute data acquisition means 114 is stored in storage means 120. FIG. 25 is a drawing exemplifying the dais conSgaration of a maintenance work database for managing attributes data pertaining to maintenance work performed on ship 5, The table of the maintenance work database is a collection of data records corresponding to maintenance work, and provides, as data fields . I date and time] that stores data indicating the date and time at which maintenance work was performed, [device name! and icampppppf name! That; big data indicating device and component; names: for maintenance, and: [maintenance. work nanre] that store® data indicating the name of maintenance work.

[013 δ]

Pig, 2d is a drawing © xeniplifytng the -data conoprration of; a used fuel oil database: for managing attributes data pertaining to fuel oil used by ship 5. The used fuel oil database includes a table corresponding to each of the engines when a plurality of engines are mounted on ship 5. Fig. 26 exemplifies a table pertaining to an engine identified by the engine ID 'Of. "The table of the used fuel oil database is a collection of data records corresponding to each of the fuel oils continuously used from the same fuel, oil tank, and provides , as dafa fields, [period] that stores data indicating the period m a fuel oil was used, [tank number] that stores the tank numbers that identify the fuel oil tank in which the fuel oil that was used was acfeomniodated, I .BDN numberj that stores the RUN number that identifies the ΒΌΜ Uikinker Delivery Note) of the fuel oil that was released,: [issuer] that, store® • data Indies ting i: he name of the issuer of the BDN. [Room tempera ture viscosity] that stores data indicating the room temperature viscosity of the fuel oil (for example, the kinematic viscosity at 40-50 degrees Celsius), [sulfur content] that stores data indicating the sulfur content of the fuel oil, arid the like.

[0136]

In this modified example, when damage to cylinder liner 53 is detected by means of a ship 5 maintenance worker viewing an image dig. 6) or any of cylinder liners 53 displayed on terminal device 11. For example, the maintenance worker performs a predetermined operation on terminal device II. Terminal device Π comprises an extraction means for extracting attribute data from each type of database stored in storage means 120 according to predetermined conditions by using a predetermined operation by a maintenance worker as a trigger ·. Conditions used by the extraction means to extract attribute data are the conditions for extracting attribute data useful for specifying the cause of damage: to cylinder liner 53 specified by the nmintenanee worker. Terminal device Π displays the contents of the attribute data extracted by the extraction means to the maintenance worker. jrø7l

Fig. 27 s «a drawing exemplifying the screen displayed by terminal device 15 to a maintenance worker in this modified example. The screen in fig, 27 displays the tabs "maintenance" smk, "" need fuel oil, "" exhaust gas tempera unx- / m i ernal pressure, "and. the like, A page corresponding to each of the tabs on the screen so fig. 27 displays the contents of the type of attribute data corresponding to tire name of the tab (tab name) in a table or oil &amp; graph. The pave in fig. 27 is a page eorMspontling to the tab name "maintenance work, · '[hidd]

The maintenance work displayed on the page in fig, 27 is mfontenance work performed, on cylinder 51 corresponding to the cylinder liner 5? specified by the maiptenanee "worker, within a period from the timing at. which the previous tpenultimate.) imaging was performed and the timing at which the current (last! imaging was performed by imaging • device 14. Terminal device 'Π displays tire page in Fig. 27 by using attribute data extracted from the maintenance work database (Fig. 25) The maintenance worker is able to view the page in Fig. 27 to determine whether or not damage to cylinder liner 58 was caused by an error in maintenance work (for example, whether an abnormal object such as a screw has entered Cylinder, 55), for example. 10539]

FIG. 28 is a drawing illustrating a page corresponding to the tab name “used fuel oil.” The fuel oil displayed on the page in fig 28 is fuel oil used by an engine corresponding to: a cylinder liner 5-3 specified by a maintenance worker within a period front a timing at which the previous ipenultimate) imaging was performed and the inning at which the current (last) imaging was performed by imaging device 14, for example. Terminal device 5.1 displays the page in fig. 28 by using attribute data extracted From the used fuel oil database <Fig. 26), the maintenance worker is able to view the page In Fig. 28 to determine whether or not damage to cylinder liner 53 was caused by the used fuel oil (for example, excessive content of silica , alumina or the like in the fuel oil), for example.

[0140]

FIG. 29 is a drawing illustrating the page corresponding to the tab name "exhaust gas femperature / mternal pressure." The pagt.1 in fig. 29 shows a graph indicating the change, over time, in the exhaust gas temperature arid internal, pressure of the cylinder 51 corresponding to the cylinder liner 53 specified by the maintenance worker. Tine exhaust, gas temperature and internal pressure varies according to the engine's load. Accordingly, termuml: device it converts the measured exhaust gas temperature and internal pressure info the: exhaust gas temperature and internal pressure: at a 5 (5% lead., for example, according to a predetermined conversion formula for conversion table) based on the load of the. engine corresponding to cydinder liner 53 specified bv the maintenance worker; iispiayeci ia fig; 2S: inåicaips the gets tempeidtttre and. irderhabp ^ conversion. ίθ 1.4 li

Terminal device 11 displays the page in fig. 29 by using attribute data extracted ironi the engine attribute database you. 11.), A maintenance weaker is capable of «% of the page in fig. 29 to determine if damage to cylinder liner 53 is caused by damage to a component of cylinder 51 {for exanipie, damage: tothe exhaust valve},: .. for example.

[(1142) iiphhis modified example, detection of damage to cylinder .liner S3 may be performed by image analysis processing of terminal device ll,: .for example. In such a case:, a maintenance worker is not inquired to detect damage, to cylinder liner 53 by viewing: an image, Moreover, in this modified example, attribute data may be extracted, according to conditions similar to the type of damage detected (for example, scrapes, corrosion, and the like). For example, a configuration may be adopted in which, if a scrape is detected in cylinder liner 53, attributes data pertaining to maintenance work are extracted, and if low * temperature corrosion ts detected, attributes dido pertaining to engine load are extracted . 10143! (16) In the embodiment described above, a configuration may be adopted in which a portion of the components provided by terminal device 11 is provided by server device 52, Moreover, in the embodiment described above, a configuration in which a portion of the components is provided. (provided by server device 12 is provided by terminal device 11 may be adopted. Pot example, in the embodiment described above, relationship data generation means 123 provided by server device 12 may be provided by terminal device 11.

[0) 44] U7) In the embodiment described above, an image captured by imaging device 14 while piston 54 moves back and forth once inside cylinder 51 (more accurately, svh.de piston 54 is moving either backwards or forwards.) Covers the entire region of cylinder liner 53. Instead, a configuration in which imaging device 14 captures a clear image of only a predetermined region of cylinder liner 53 may be adopted. For example, when a maintenance worker or the like wishes to know the suite of wear of a region that is close to the top of cylinder liner 53, imaging device 14 need only perform imaging in a position that is close to the top of cylinder liner 53rd

[0115]: (110 In; the embodiment described above, terminal device ll and server device 12 are: realized by means of: "General com pi iter carrying out a (process according to; a program. Instead, terminal device ll and / or server device .12 may be configured as a so called device device. Explanation of ihe Reft> renee: .Ki «jåiiéii8 | J ^] 1 () 146 (1 ... vy] in the liner examination system: 5 ... ship £>., eoiimimrieation satellite 7 ... holding too! 8 ... crank angle measurement device 9 ... group of measurement devices: 10 ... computer 11 de ^ jee 1¾ ... server device 13 ... server device 14 ... imaging device 20 ... computer 51 ... cylinder 52 .., cylinder cover 53 ... cylinder liner: 34, piston 91 .. engine rotation speed measurement device §2 ... engine load measurement device 93 ... wind speed / vvi nd direction measnremPnldeyiee: 94 ... tide speed / tide direction measurement device 95 ... ground speed measurement device 96. ... log speed measurement devi ce 101 .. 1.memory '102 ... processor 103 ... communication interface 104 ... display device 105 ... operation device Π0 ... timing means 111 ... position data, acquisition means 11.2 ... command means 113 ... image data acquisition means 1:14. ,,, attribute data acquisition means ..115 ... i wearspeeitying means 116 ... transmission muanf ii ", .. relationship data acquisition means i8, .. wear estimafion means 1.19 ... notification means 120 ... storage means * 121 ... ettrtbuh" data acquisition meads 122 ... wear data acquisition me " ns 123 ... relationship data generation «means; 124 *.: stprage: meMis. 12tn ... request mean s 126 ... met.eprolopcal / ma riaie data acquisition means 127, - - iran emission means XII, .. imaging unit 143 .. sight "emitting unit 143 ... control unit 144 ... receiving unit 140 ... storage unit 1.46 ... transmission unit 201, "Memory 202 ... processor 203 ... commumoat io): interface 511 ... scavenging port: 531,.,: recessed portion

Claims (2)

1. Hype of Dwtuttept] GlaitnA [Claim ll A system for exainimPga. eyliiidehlmeh comprising art imaging means that, is configured so as to bo capable of being· disposed on an upper surface of a piston of an engine, said imaging mean» imaging the inside surface offs cylinder jitter that covers an inside surface of a cylinder that accommodates the piston and generating cylinder liner image data indicating the captured image, and a position data acquisition means for acquiring position data indicating a position of ihmimaging means in a movement direction of the piston iClaim
2. 2] A system ant:forth m claim;: lf:comprising a command means; for cotpinapdipg imaging to the imaging; means: ^hen thexposi&amp;n data huiicates a prrheteriuiued position, wherein the imaging means performs imaging in accordance with commands received from the command means. I Claim 21 Λ system set forth in claim 1 or 2. wherein the position data acquisition means acquires crank angle data indicating a crank angle pertaining to the piston and generates the position data using the crank angle data, [Claim --1 ] A.System set forth in claim 1 or 2, comprising a range-finding means that is configured so as to be capable of being disposed on the upper surface of the pisten, said, range-finding means measuring the distance between the upper surface of f he piston and the flame-contact surface of a cylinder cover positioned at the top of the cylinder and generating movement direction distance data indicating the measured di'-tu'K e. \v herein the position data acquisition means generates the position data using the movement direction distance data. !Claim al A system set forth, in claim I. or 2, wherein thé imaging means images the flame-contact surface of the cylinder cover positioned at the top of the cylinder and generates flame-contact surface image data indicating the Mpfiired image, and the position data aeqttlgitiett the: position data using the flame- contact surface image data. [Claim dl Λ system set forth in claim i or 2, where io the position data acquisition means generates the position data Ming the ctdindér liner image data. [Claim 73 A system set forth in any one of claims 1'6, comprising a direction. data acquisition means that acquires:: direction data indicating :tiie imaging direction by the imaging uueans, [Claim 83 A system sot forth in claim 7, wherein the imaging means images the tlame-contact surface of the cylinder cover positioned at the top of the cylinder and: generates flanimeoatact surface image data indicating the: captured image, and the direction data acquisition means generates the direction data using the flame· contact surface image data. [Clmm 9l A system set forth in claim 7, wherein the direction, data acquisition means generates the direction data using the cylinder liner image data. [Claim lOl A system set forth in any one of claims 1'9, wherein the imaging means measures the distance from the imaging means ter an imaging subject and generates imaging distance data indicating the measured distance, and said system comprises a.ii^tyegtidn.ip^aBSijfqr'porrecting the cylinder: limer image data: using the imaging distance data, [Claim 111 A system set forth in. any one of claims Hi, wherein the imaging means images the ilame'eontact surface of the cylinder cover positioned at the top of. the cylinder and generates flame-contact· surface image data indicating the captured image, find said system comprises a correction means for correcting the cylinder liner image date rising the flame-contact surface image data, [Claim 12| A system set forth in any one of claims 1' 11, comprising .a wea.rmpeeifying ineons for specifying the extent of wear ofAhe ...cylinder .liner using: the cylinder liner image .data and generating wear data indicating the specified: extent of wear.. i Chum 13] •A system set forth in claim 12, wherein the imaging means generates cylinder Imef image data pertaining to each of a plurality of cylinders of the same type provided by an. engine mo lasted on one ship or on each of a plurality of ships of the same type, and said system comprises attribute data acquisition means for acquiring attribute data indicating attributes of navigations performed in the past by the one ship or the plurality of ships of the same type, said attributes influencing the wear of the cylinder liner, and a relationship data generation means for generating n lationship data indicating the relationship between the attributes and the extent of wear of tin1 cylinder liner using the wear data and the attribute data, [Claim Ml A system set forth hi claim 12. wherein the imaging means generates cylinder liner image data pertaining to a cylinder .provided by an engine mounted on a ship, arid said system comprises an attribute data acquisition means for acquiring attribute data indicating attributes of navigations performed by the ship, said attributes influencing' the wear of the cylinder liner, and a; wear estimation means for estimating the extent of wear of the cylinder: liner using the attribute data and the relationship: data and: generating estimated wear data indicating the estimated extent of wear. [Claim IS] A.system set forth in claim 14, comprising a notification means for notifying a user, using a predetermined notification, if the difference between fire 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-specifying means pertaining to the cylinder liner fit a certain timing satisfies predetermined conditions. I Claim 1 til A system set forth, in any one of claims 1 · 15, wherein the imaging means generates cylinder liner image data ibr each of a plurality of cylinders of the same type, and said system comprises .an evaluation data acquisition means for acquiring the: cylinder liner image: data generated .by the imaghrg means and evaluation data indicating an evaluation pertaining to the stare of the ©yliJidei' l«er based on ihe isnede indledt# by the e^Iipher liuefe irøage data, and an extraction means for extracting, from ament; a plurality of items of evaluation data acquired by the evaluation data a exposition mean:', evaluation data corresponding to cylinder liner imago data'indicating ptvdetemnoed .similarities between cylinder line)' image data specified hy a use!'. [Claim 17] A system set forth in claim 1. wherein the- imaging meat® generates cylinder linet? image? data pertaining to a; cylinder provided hy a«. pn &amp;.*hip, and said system: comprises an aftAbnte data acquiption meanpii^ attributes· of navigation performed so the past: hy the ship, and an extraction means for extracting attribute data that satisfies predetermined conditions corresponding to the damage from among a plurality of items of attribute data acquired hy the attribute dm:a acquisition means when an image shown hy the cylinder liner image data generated by the imaging mentis indicates damage to·the cylinder liner. [Claim 18] A method for examining a cylinder liner, comprising n step in which the piston of an engine having an imaging device provided to the upper surface thereof moves within the cylinder that, accommodates the piston, and a step in which the imaging device images the inside surface of the cylinder liner that covers the inside surface of the cylinder while the piston is mowing \«ithirs the cylinder or after the piston has finished moving within the cylinder. [Claim 19] A holding tool that is configured so as to he capable of being disposed on the upper surface of the piston of an engine, said holding tool holding art tinaging device that images the inside surface of a cylinder liner that covers the inside surface of a cylinder that accommodates the piston while obstructing the transfer of heat from the piston to the imaging device, ! Claim 20] A holding tool set forth in claim 19, having an elastic body disposed between the upper surface of the piston find the imaging device. [Claim 21] A holding tool set forth in claim 19 or 20. having characters, symbols, or drawings indicating the direction of imaging by the imaging device in the igtagiug region of detdeé. [Claim 22] A hMåiag tool sét iorth. in any one of claims 19-21., having legs tbAt support the imaging device in a state of being separated fipto the tipper surface of ifur piston. [Claim 23] A-holding t&amp;é\-setforth in any one of claims 19-22. having a rod-like body that is inserted into a ..recess provided to the upper siiiface of the piston.-, iClai m 24] A bolding tool set forth in any one of eiainis 19'21,, haying a contact »arfaee hayiitg a . shape hliat: engages with the shape: of flies upper surface pf the piston, [Claim 25] A cylinder liner of an engine, haying an inside upon which a pattern occurs, at least one of the sire, shape, and direction of said pattern- ch&amp;njpng-according to a degree of wear, [Claim 26] A cylinder liner set forth in chum 25, having recessed portions on the inside surface, at least one of the size, shape, and direction of said recessed portion changing tn the radial direction of tire cylinder. [Claim 27] A cylinder litter set forth ip. claim 26, wherein the recessed portions are filled with a material having a color different from the color of the main body [Claim 2Si A cylinder litter set forth in any one of chi ms 25'27. wherein a pattern occurs in a plurality of positions in rite circumferential direction of the cylinder. [Claim 29] A cylinder lurer set: .fnrih in any one of claims 25-28, wherein a pattern occurs in a plurality of positions in the movement direction of the piston. [Claim 30] Act Under liner sot forth in claim 28 or 29, vyheAnh a different pattern: Occurs in each of a plurality: of positions.