CN108469341A - A kind of attached wall oil film test method in engine combustion process and device - Google Patents
A kind of attached wall oil film test method in engine combustion process and device Download PDFInfo
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- CN108469341A CN108469341A CN201810104752.0A CN201810104752A CN108469341A CN 108469341 A CN108469341 A CN 108469341A CN 201810104752 A CN201810104752 A CN 201810104752A CN 108469341 A CN108469341 A CN 108469341A
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- oil film
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
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Abstract
The present invention relates to the attached wall oil film test methods and device in a kind of engine combustion process, belong to engine technical field of optical test.Attached wall oil film test method in a kind of engine combustion process relied on the device including the attached wall oil film test device in a kind of engine combustion process；Wherein, on optical engine in the apparatus, the glass for using surface frosted, lower surface bright and clean is replaced as new piston top；It is illuminated and is shot with stroboscopic pulse laser and high speed camera and to the attached wall oil film in combustion process；By attached wall oil film test method guiding photographing in combustion process, finally obtain attached wall oil film piston face different moments area two-dimensional distribution characteristics.The device and method have filled up the blank of attached wall oil film measuring technology in current engine cylinder combustion process, are suitable for engine major part operating condition and pluralities of fuel, do not differentiate between one-component fuel or multigroup part of fuel combination.
Description
Technical field
The present invention relates to the attached wall oil film test methods and device in a kind of engine combustion process, belong to engine optics
Technical field of measurement and test.
Technical background
In recent years, also increasingly stringent for the discharge limitation of motor vehicle with the getting worse of energy and environmental problem.Closely
In the emission regulation that the China Xie Nian formulates, soot particulate discharge is important limitation object.The one of soot is generated in engine
A main cause, which is the fuel oil of penetrating cylinder, to be atomized well, remain in piston or cylinder surface, form attached wall oil film.By
In can not be come into full contact with air, attached wall film combustion is simultaneously insufficient, will produce a large amount of soots.
For diesel engine, in order to extend delay period, making fuel oil before combustion can have more many new combustion patterns
Time goes to mix with air, mostly uses " early spray " strategy, terminate in induction stroke or earlier at the time of oil spout.Piston is located at this time
Compression stroke initial period, density and pressure are all relatively low in cylinder, by resistance very little in the fuel oil motion process of high-pressure injection, because
This fuel oil is easy to reach piston face rapidly, forms attached wall oil film.
For direct spray petrol engine in cylinder common at present, in addition to same diesel engine is the same, near piston compression starting point
" early spray " strategy can be formed outside attached wall oil film, and " evening spray " strategy will also result in attached wall oil film." evening spray " is mainly in spark plug
It is formed about sufficient concentrations of gaseous mixture, to ensure combustion stability, the oil spout when compression stroke is close to top dead centre.Piston at this time
With optical engine built in fuel injector distance it is close, it is also possible to generate attached wall oil film.
In addition to said circumstances, when cold start, cylinder temperature is relatively low for gasoline engine or diesel engine, is unfavorable for the steaming of fuel oil
Hair atomization, the fuel droplets for not being in time for evaporation largely fly to piston face, can also form attached wall oil film.
Therefore, it is necessary to understand in depth, attached wall oil film generates and developing characteristics especially in combustion investigate different knots
Structure, environment and engine operating parameter influence it, understand its Conduce Disciplinarian, and then can more preferably control granular material discharged.It can
Cherish so far, report is not yet seen in about the attached wall oil film measuring technology in engine combustion process.
Invention content
The purpose of the present invention is the blank for attached wall oil film measuring technology in current engine cylinder combustion process, propose
A kind of attached wall oil film test method in engine combustion process and device, the approach application that the present apparatus is relied on is in engine
It, can be in engine compared with obtaining area two-dimensional of the attached wall oil film in piston face different moments in wide working range in combustion process
Distribution characteristics.
In attached wall oil film test method and device, including a kind of engine combustion process in a kind of engine combustion process
Attached wall oil film test device and a kind of engine combustion process for being relied on of the device in attached wall oil film test method.
A kind of attached wall oil film test device in engine combustion process includes engine block, optical module and imaging mould
Block；
Wherein, engine block is optical engine, built-in lengthened piston and is placed in lengthened piston and is internally located at piston
45 ° of speculums immediately below pushing up；
Optical module includes the bright and clean glass in upper surface frosted, lower surface, and the installation of optical module and manufacturing process are as follows：
The bright and clean glass in upper surface frosted, lower surface is replaced to be used as new piston top, is lived using roughened upper surface as glass
Surface beyond the Great Wall；
Wherein, upper surface roughness Ra >=2 μm of the glass so that the bright and clean glass piston in upper surface frosted, lower surface
For top surface when no oil film adheres to, the optical signal for returning to high speed camera is less；And when there is oil film attachment, return to high speed camera
Optical signal it is stronger；
Image-forming module includes mainly high speed camera and stroboscopic pulse laser.
A kind of each module connection of attached wall oil film test device in engine combustion process and installation relation are as follows：
Engine block is connected with optical module；The output of optical module is believing with attached wall oil film for image-forming module acquisition
The optical signal of breath.
Each functions of modules is as follows in a kind of attached wall oil film test device in engine combustion process：
Engine block is the carrier of experiment；Optical module is used for receiving the stroboscopic arteries and veins in image-forming module as lighting source
The laser that laser is sent out is rushed, so that it is irradiated to the bright and clean glass piston top in upper surface frosted, lower surface as incident light, and anti-
It is emitted back towards the optical signal with attached wall oil film information；High speed camera in image-forming module receives and records optical signal, stores into image,
It is analyzed for attached wall oil film characteristic.
A kind of attached wall oil film test method in engine combustion process, is realized by following steps：
Step 1, stroboscopic pulse laser are penetrated by the bright and clean glass piston top in 45 ° of speculums and upper surface frosted, lower surface
Enter in cylinder；
Wherein, stroboscopic pulse laser is incident light, is generated by the stroboscopic pulse laser in image-forming module；Stroboscopic pulse swashs
Frequency >=10Hz of light, pulse width≤10ns, optical maser wavelength is between 450nm-650nm；
Step 2, time for exposure≤500ns that high speed camera is set；Filming frequency and stroboscopic pulse Laser synchronisation are set,
Optical axis included angle≤40 ° of high speed camera and stroboscopic pulse laser；
Wherein, filming frequency and stroboscopic pulse Laser synchronisation are meant that each stroboscopic pulse laser sends out laser,
High speed camera, which all works asynchronously, captures the picture of laser irradiation；
Optical engine in step 3, operation engine block is to specified rotating speed K, but fuel injector is sprayed without fuel oil；
Step 4, high speed camera and the work of stroboscopic pulse Laser synchronisation obtain the glass dried when non-oil spout in cylinder and live
The image of plug top frosted upper surface, which is used as, refers to background image；
Wherein, the bright and clean glass piston top in this glass piston top and upper surface frosted, lower surface is same object；
Step 5, holding engine running speed are K, and oil spout igniting makes engine normal operation.It obtains in combustion process
The oil film of glass piston upper surface is from attached wall to disappearance whole process t1、t2……tnThe image of different moments；
Wherein, the fuel oil of glass piston top roughened upper surface is ejected under the irradiation of laser, can be more bright, it can refer to
Show the distribution area of fuel oil；Simultaneously by reducing time for exposure to the nanosecond rank (≤500ns) of high speed camera, effectively inhibit combustion
It makes a fire interference of the flame to oil-film images, obtains good signal-to-noise ratio；
The oil film of glass piston upper surface is from attached wall to disappearance whole process in step 6, the combustion process for obtaining step 5
t1、t2……tnThe reference background image that the oil film information distributing plan picture and step 4 of different moments obtains carries out comparison processing, i.e.,
Can analyze the attached wall oil film in combustion process different moments area two-dimensional distribution character；
So far, step 6 is arrived by step 1, completes the attached wall oil film test method in a kind of engine combustion process.
Advantageous effect
Attached wall oil film test method in a kind of engine combustion process of the present invention and device, with existing Oil spill detection technology
It compares, has the advantages that：
1. the present invention is suitable for engine major part operating condition；
2. the present invention is suitable for multiple fuel, one-component fuel or multigroup part of fuel combination are not distinguished；
3. the attached wall oil film Two dimensional Distribution when present invention can actually measure engine operation combustion process changes with time
Situation, this is that up to the present any oil film measuring technology institute is irrealizable.
Description of the drawings
Fig. 1 is the attached wall oil film test device in the present invention in a kind of engine combustion process and the optics in embodiment 1
Engine composition schematic diagram；
Fig. 2 is unattached in attached wall oil film test method and example 1 in the present invention in a kind of engine combustion process
The index path of oil film；
Fig. 3 is to adhere to oil film in attached wall oil film test method and example 1 in the present invention in a kind of engine combustion process
Index path；
It illustrates：The bright and clean glass piston top in the frosted of the upper surfaces 1-1, lower surface；
45 ° of speculums of 1-2；
1-3 stroboscopic pulse lasers；
1-4 high speed cameras；
1-5 fuel injectors.
Specific implementation method
The present invention will be further described and detailed description with example below in conjunction with the accompanying drawings.
Embodiment 1
The present embodiment will be apparent from the test method of the attached wall oil film on inventive engine cylinder inner carrier surface general
In the case of be embodied when the case where.
Before implementing to test, as shown in Figure 1, the glass for using surface frosted, lower surface bright and clean is needed to replace as new living
Plug top；High speed camera and stroboscopic pulse laser are positioned over 45 ° of horizontal right opposites of speculum, optical axis included angle≤40 ° of the two.Such as
Shown in Fig. 2, when being sprayed without fuel oil, the bright and clean glass piston top in upper surface frosted, lower surface does not have oil film covering.With frequency
The laser that flash pulsing laser is sent out as incident light, at this time the overwhelming majority be incident on roughened upper surface laser can surface to
Diffusing reflection occurs for all directions, takes the lower piston top image of brightness.This low-light level, the image general without attached wall oil film
As with reference to background image, and the attached wall oil-film images taken later compare.Fig. 3 is illustrated when upper surface frosted, following table
When the bright and clean glass piston top upper surface in face has fuel liquid, rough surface portion becomes relatively bright and clean table by fuel oil infiltration
Face, many incident lasers can be reflected in liquid and Air Interface.It is sent out due to high speed camera and stroboscopic pulse laser
Incident light axis angle very little, has a large amount of laser signals to enter high speed camera by speculum, obtains bright attached wall oil film figure
Piece.
In addition, once intracavitary starts to burn, in combustion process, other than incident laser, the light that flame is sent out also is had
Signal, this can influence test result.In order to filter out the interference of flame, experiment uses the laser that stroboscopic pulse laser is sent out as light
It is incident on abrasive glass surface in source；Since laser pulse width only has several nanoseconds, while shorter exposure is set in high speed camera
Between light time, the luminous signal of flame can be inhibited, it is ensured that the high energy laser signal of only short pulse can be got off by cameras record,
Luminous flame is set not interfere with oil film test.
The above is presently preferred embodiments of the present invention, and it is public that the present invention should not be limited to embodiment and attached drawing institute
The content opened.It is every not depart from the lower equivalent or modification completed of spirit disclosed in this invention, both fall within the model that the present invention protects
It encloses.
Claims (6)
1. the attached wall oil film test device in a kind of engine combustion process, it is characterised in that：Including engine block, optical mode
Block and image-forming module；
Wherein, engine block is optical engine, built-in lengthened piston and is placed in lengthened piston and is being internally located at piston top just
45 ° of speculums of lower section；Optical module includes the bright and clean glass in upper surface frosted, lower surface；Image-forming module includes mainly high speed
Camera and stroboscopic pulse laser；
The engine block is connected with above-mentioned optical module；The output of above-mentioned optical module is above-mentioned image-forming module acquisition
Optical signal；
In above-mentioned each module, engine block is the carrier of experiment；Optical module is used for receiving in image-forming module as illumination
The laser that the stroboscopic pulse laser of light source is sent out makes it be irradiated to the bright and clean glass in upper surface frosted, lower surface as incident light
Glass piston top, and it is reflected back the optical signal with attached wall oil film information；High speed camera in image-forming module receives and recording light letter
Number, storage is analyzed at image for attached wall oil film characteristic.
2. the attached wall oil film test device in a kind of engine combustion process according to claim 1, it is characterised in that：Light
Installation and the manufacturing process for learning module are as follows：The bright and clean glass in upper surface frosted, lower surface is replaced to be used as new piston top, with thick
Rough upper surface is as glass piston upper surface；Wherein, upper surface roughness Ra >=2 μm of the glass so that upper surface frosted, under
For the glass piston top surface of any surface finish when no oil film adheres to, the optical signal for returning to high speed camera is less；And there is oil film
When attachment, the optical signal for returning to high speed camera is stronger.
3. the attached wall oil film test method in a kind of engine combustion process, which is characterized in that include the following steps：
Step 1, stroboscopic pulse laser inject gas by the bright and clean glass piston top in 45 ° of speculums and upper surface frosted, lower surface
In cylinder；
Step 2, time for exposure≤500ns that high speed camera is set；Filming frequency and stroboscopic pulse Laser synchronisation, high speed are set
Optical axis included angle≤40 ° of camera and stroboscopic pulse laser；
Optical engine in step 3, operation engine block is to specified rotating speed K, but fuel injector is sprayed without fuel oil；
Step 4, high speed camera and the work of stroboscopic pulse Laser synchronisation, obtain the glass piston top dried when non-oil spout in cylinder
The image of frosted upper surface, which is used as, refers to background image；
Wherein, the bright and clean glass piston top in this glass piston top and upper surface frosted, lower surface is same object；
Step 5, holding engine running speed are K, and oil spout igniting makes engine normal operation；Obtain glass in combustion process
The oil film of piston upper surface is from attached wall to disappearance whole process t1、t2……tnThe image of different moments；
The oil film of glass piston upper surface is from attached wall to disappearance whole process t in step 6, the combustion process for obtaining step 51、
t2……tnThe reference background image that the oil film information distributing plan picture and step 4 of different moments obtains carries out comparison processing, you can point
Analyse combustion process in attached wall oil film different moments area two-dimensional distribution character；
So far, step 6 is arrived by step 1, completes the attached wall oil film test method in a kind of engine combustion process.
4. the attached wall oil film test method in a kind of engine combustion process according to claim 3, it is characterised in that：Step
In rapid 1, stroboscopic pulse laser is generated by the stroboscopic pulse laser in image-forming module；Frequency >=10Hz of stroboscopic pulse laser,
Pulse width≤10ns, optical maser wavelength is between 450nm-650nm.
5. the attached wall oil film test method in a kind of engine combustion process according to claim 3, it is characterised in that：Step
In rapid 2, filming frequency and stroboscopic pulse Laser synchronisation are meant that each stroboscopic pulse laser sends out laser, high speed camera
All synchronous working captures the picture of laser irradiation；Optical axis included angle≤40 ° of high speed camera and stroboscopic pulse laser.
6. the attached wall oil film test method in a kind of engine combustion process according to claim 3, it is characterised in that：Step
In rapid 5, the fuel oil of glass piston top roughened upper surface is ejected under the irradiation of laser, can be more bright, it can indicate fuel oil
Distribution area；Effectively inhibit combustion flame to oil film figure to nanosecond rank by the time for exposure of reduction high speed camera simultaneously
The interference of picture obtains good signal-to-noise ratio；
Wherein, time for exposure to nanosecond rank refers to≤500ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104752.0A CN108469341A (en) | 2018-02-02 | 2018-02-02 | A kind of attached wall oil film test method in engine combustion process and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104752.0A CN108469341A (en) | 2018-02-02 | 2018-02-02 | A kind of attached wall oil film test method in engine combustion process and device |
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| CN201810104752.0A Pending CN108469341A (en) | 2018-02-02 | 2018-02-02 | A kind of attached wall oil film test method in engine combustion process and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855218A (en) * | 2020-08-18 | 2020-10-30 | 一汽解放汽车有限公司 | Internal combustion engine cylinder internal visual testing system |
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| CN103470393A (en) * | 2013-10-09 | 2013-12-25 | 吉林大学 | Lengthened piston for visual gasoline direct-injection engine |
| CN106168540A (en) * | 2016-08-09 | 2016-11-30 | 天津大学 | Can flexible flowing pressure ripple burning interact visualization combustor |
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2018
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Patent Citations (5)
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| US4281533A (en) * | 1980-01-14 | 1981-08-04 | General Motors Corporation | Apparatus for measuring soot concentration in engine oil |
| JPH1137925A (en) * | 1997-07-22 | 1999-02-12 | Nippon Sheet Glass Co Ltd | Droplet detector |
| CN102175166A (en) * | 2011-02-16 | 2011-09-07 | 武汉理工大学 | Device for detecting thickness of oil film between cylinder sleeve and piston ring of diesel engine |
| CN103470393A (en) * | 2013-10-09 | 2013-12-25 | 吉林大学 | Lengthened piston for visual gasoline direct-injection engine |
| CN106168540A (en) * | 2016-08-09 | 2016-11-30 | 天津大学 | Can flexible flowing pressure ripple burning interact visualization combustor |
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| 孔祥东 等: "直喷汽油机喷雾碰壁特性实验研究", 《燕山大学学报》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111855218A (en) * | 2020-08-18 | 2020-10-30 | 一汽解放汽车有限公司 | Internal combustion engine cylinder internal visual testing system |
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Application publication date: 20180831 |