JPS61218737A - Combustion photographing apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To correctly photograph the state in a combustion chamber all over the processes by installing an optical fibers whose one edge is set close to a combustion chamber and the other edge has a photographing apparatus and irradiating light into the combustion chamber if necessary. CONSTITUTION:An annular passage 61 is formed into a penetration hole 18a on a cylinder head 18. A guide pipe 27 is inserted into the center part of the annular water passage 61, and an optical fiber 28 for photographing, optical fiber 29 for illumination, and an optical fiber 30 for detecting light are inserted. One edge of each optical fiber is set close to a light transmission member 43 made of quartz glass and each optical fiber is set close to a combustion chamber 24. One edge of the optical fiber 28 for photographing is connected to a photographing apparatus 32, and the optical fiber for illumination is connected to a luminous element 36, and the optical fiber for detecting light is connected to a light receiving element 34. Since the light in a combustion chamber 24 is detected, and photographing in carried out through the radiation of light into the combustion chamber 24 if necessary, the correct photographing work is permitted all over the processes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for photographing combustion conditions within an internal combustion engine.

BACKGROUND ART A typical prior art is described in the Japan Society of Mechanical Engineers Kansai 122nd Seminar Materials, page 90, and is shown in FIG. This prior art is a model that reproduces the phenomena inside the combustion chamber of an actual internal combustion engine.

The sill head 2 and the piston 3 have a fitting hole 2a,
3a are formed respectively. These fitting holes 2a, 3a
A translucent member 4.5 is fitted into each of the parts. This translucent member 4.5 is made of quartz glass, for example.

Light passes through the side wall of the shilling head 2 through 1ii.
I7 is provided, and this light passing tube 7 is inserted through a long hole 8 formed in the side wall of the piston 3. Therefore, the piston 3 is capable of reciprocating in the direction in which the elongated hole 8 extends (the vertical direction in FIG. 7) with the light transmitting tube 7 inserted into the elongated hole 8.
A reflecting mirror 9 is fixed to one end of the light passage #17, and an imaging lens 10 is fixed to the other end. pulse·
Light from a light source realized by a laser or the like is partially reflected by the beam splitter 11 and passes through the light-transmitting member 4, the combustion chamber 12, and the light-transmitting member 5 to the reflected light 1.
Reflected by 1!9. Reflection 1! ! Is the light reflected by 9 light passing 1? and is imaged onto the image sensor 13 by the imaging lens 10. At this time, ethane gas is jetted into the combustion chamber 12 from the fuel injection valve 14. The remaining light from the light source other than the light reflected by the beam splitter 11 travels straight, is reflected by the reflecting mirror 15, and then reaches the image sensor 13. In this way, a hologram reconstructed image is obtained by the so-called double exposure method of ethane gas in the combustion chamber 12.

Problems to be Solved by the Invention In such prior art, 111g of the cylinder head 2
! A long hole 8 must be provided in the piston 3 through which the light transmitting tube 7 provided in the cylinder head 2 is inserted, and fitting holes 2a and 3m are formed in the piston 3 that extends from the cylinder head 2. Because the optical members 4 and 5 are fitted, the strength is weak (the actual internal combustion operating conditions, such as the internal pressure, temperature, and compression ratio in the combustion chamber 12, are not necessarily satisfied. Moreover, since the images are taken using a high-speed camera and are moved at high speed, the measurement time is in seconds, and the development time and costs are high, making it difficult to compare the actual internal combustion engine. There were drawbacks such as the inability to visually confirm the situation and take measures such as changing operating conditions.

Therefore, the object of the present invention is to realize the actual internal combustion 8! To provide a combustion photographing device for an internal combustion engine capable of photographing the combustion state under the operating conditions of a leapfrog over the entire process and visually confirming the combustion state.

Means for Solving the Problems The present invention provides: a light-transmitting member that defines a combustion chamber; a photographing light 7 eyeper whose one end face faces the combustion chamber through the light-transmitting member; and the photographing light 7. A light receiving means facing the other end face of the eyeper detects light from the combustion chamber, a light emitting means for irradiating light to the combustion chamber, and a light emitting means responsive to the output from the light receiving means to set the light emitting means to an aS state when there is light in the combustion chamber. Internal combustion 8! characterized in that it includes a control means for activating the light emitting means when there is no light in the combustion chamber.
This is an open combustion photography device.

According to the present invention, a light-transmitting member defining a combustion chamber, a seven-eye lens for photographing whose one end face faces the combustion chamber through the light-transmitting member, and a light receiving means for detecting light from the combustion chamber. Since a light emitting means for irradiating light onto the combustion chamber is provided, it becomes possible to photograph the inside state of the combustion chamber in an actual internal combustion engine. In addition, control means is provided for activating the light emitting means when there is light in the combustion chamber and activating the light emitting means when there is no light in the combustion chamber in response to the output from the light receiving means, so that combustion does not occur within the combustion chamber. It becomes possible to accurately photograph the situation inside the combustion chamber throughout the entire process, both when combustion is occurring and when combustion is not occurring.

Embodiment FIG. 1 is a simplified system diagram of an embodiment of the present invention. A cylinder head 18 is fixed to the upper part of the cylinder liner 17, and a piston 19 is inserted within the cylinder liner 17 so as to be able to reciprocate.

As the piston 19 reciprocates in the vertical direction in the figure t14i within the cylinder liner 17, the connecting rod 20
The crank shaft 22 is rotated via the crank arm 21.

A combustion chamber 24 is formed by the cylinder liner 17, the cylinder head 1B, and the piston 19. The cylinder head 18 has a combustion chamber 2 extending through the cylinder head 18.
A fuel injection valve 23 for injecting fuel is provided in the fuel injection valve 4 . Further, the cylinder head 18 is provided with a through hole 18 a that communicates with the combustion chamber 24 . An attachment tube 26 for attaching a flexible guide tube 27 is inserted through and fixed in this through hole 18a.

Figure 2 is a sectional view of the vicinity of the mounting tube 26, and Figure 3 is a sectional view of the vicinity of the mounting tube 26.
It is a cross-sectional view taken from the section line ■-■ in the figure, and Figure 4 is 1
FIG. 3 is a cross-sectional view taken along the section line ■-■ in FIG. 3; Inside the guide tube 27, as shown in FIG.
8, and a plurality of (
In this embodiment, the two illumination moonlight fibers of 3) and the light detection optical fiber 30 are inserted. Photography light 7 Aipa 2
8 is connected to the photographing device 32. Light 7 Eyepa 3 for light detection
0 is the lighting equipment r! It is connected to the light receiving element 34 of 133. The illumination light 7 eyeper 29 is connected to the illumination device fl! via a line indicated generally by reference numeral 35. 33 light emitting elements 36. The lighting device 33 includes a control circuit 37, which includes the light receiving element 34 and the light emitting element 3.
6 is connected.

A holding member 39 is hermetically fitted near the bottom of the through hole 18a of the cylinder head 18. This holding member 39
A cylindrical fitting recess 40 is formed in the center.

This fitting recess 40 further has a mounting recess 41 formed below with a step. In the fitting recess 40,
A mounting seat 42 for mounting the guide tube 27 is hermetically fitted. In addition, in the mounting recess 41, there are gaskets 44a and 44b on which the translucent member 43 is mounted on the upper and lower outer peripheral edges thereof.
The combustion chamber 24 has an airtight and pressure-resistant structure with respect to the high temperature and high pressure combustion chamber 24. Below the mounting recess 41 is a communication hole 4 that communicates with the combustion chamber 24 via a step.
5 is formed. The inner diameter of the communication hole 45 increases from the mounting recess 41 to the combustion chamber 24.

Translucent member 43 defines combustion chamber 24 .

The mounting tube 26 is fixed above the holding member 39 in FIG. 1@2. The attachment cylinder 26 includes a cylinder main body 47 and a presser plate 48 fixed to the upper part of the cylinder main body 47. The cylinder body 47 is formed with an outwardly facing upper part 7 flange 49 and a lower part 7 flange 5o. The mounting tube 26 has the upper part 7 runci 4
9 into the through hole 18a of the sill head 18, and is hinged to the holding member 39 by a plurality of (8 in this embodiment) bolts 51 passing through the lower 7 flange 50. The cylinder main body 47 and the presser plate 48 are connected to the upper part 7.
It is substantially integrated into one piece via Runno 49. The holding plate 48 has a through hole 48g passing through it vertically, and its top surface is covered with a thin seat plate 53 having a circular hole 53a formed in the center. This seat plate 53 is hinged to the press plate 48 by a tightening bolt 54. The circular hole 53a of the seat plate 53 is sealed with two large and small rubber gaskets 55 and 56. Further, the holding plate 48 is penetrated by a bolt 57 which is screwed into the top of the cylinder head 18, and this bolt 57 is passed through a sleeve 58, and a nut 59 is hinged at the upper part in FIG. A combination of bolts 57 and nuts 59 secures the holding plate 48 to the top of the shilling head 18.

The attachment seat 42 to which the end of the guide tube 27 is attached is fitted into the fitting recess 40 of the holding member 39, as described above.

As shown in FIG. 3, this mounting seat 42 is tightened and fixed to the holding member 39 by a plurality of (four in this embodiment) ports 60. An annular water channel 61 is formed in the mounting seat 42. be done. The suitable waterway 61 includes a water supply pipe 62 and a drain pipe 6.
3 is connected. Cooling water flows from the water supply pipe 62 to the suitable waterway 6.
Cooling water supplied to the inside of the cooling water tank 1 and flowing through the suitable waterway 61 is drained through the drain pipe 63. In this way, the suitable waterway 61 is formed and the cooling water is supplied into this suitable waterway 61.
, the illumination light 7 eyeper 29 and the light detection light 7 eyer 30
is prevented from being excessively heated by the heat within the combustion chamber 24. In addition, the suitable waterway 61 has cleaning openings 64 m, 64
b is drilled, and plugs 65m and 65b are attached respectively.

The end of the guide tube 27 is inserted into the center of the suitable waterway 61 in the mounting seat 42 . As shown in FIG. 5, a photographing optical fiber 28, an illumination light 7 eyer 29, and a light detection light 7 eyer 30 are inserted into the guide tube 27. A screw hole 42a is formed in the center portion of the mounting seat 42.

An external thread (not shown) is formed on the outer periphery near the end of the guide tube 27 to fit into the screw hole 42a. 1F2
7 is hinged to the screw hole 42m. Guide tube 27 into screw hole 4
2a, and lock the guide tube 27 with a lock nut 66.
is fastened to the mounting seat 42. In this state, one end surface of the photographing light 7 eyer 28, the illumination light 7 eyer 29, and the light detection optical fiber 30 inserted into the guide tube 27 is connected to a transparent member 43 made of quartz plus or the like. Close to each other. Therefore, one end surface of each of the photographing light 7 eyer 28, the illumination optical fiber 29, and the light detection light 7 eyer 30 faces the combustion chamber 24 through the light-transmitting member 43 and the communication hole 45.

The guide pipe 27 passes through the rubber gaskets 55 and 56 together with the aforementioned water supply pipe 62 and drain pipe 63 to form a vibration-proof structure.

Referring again to FIGS. 1 and 1@2, the imaging optical fiber 28 is connected to the imaging device 32 as described above. The photographing device 32 is realized by, for example, an electronic shutter type video camera. If this imaging device 32 is made of a CCD element (signal load transfer imaging method), poor sensitivity due to heat can be prevented even when observing a large amount of light such as when observing the inside of the combustion chamber 24. Since the electronic shutter can be operated at intervals of, for example, 1-5 to 0.2 ll1s, it is possible to perform frame-by-frame photography over several frames even during high-speed development such as combustion in the internal combustion engine of the present invention.

Further, as the photographing device 32, a camera having another configuration may be used instead of the electronic shutter type video camera. In this way, the combustion chamber 24 of the actual internal combustion engine can be visually inspected.
It becomes possible to observe the combustion state inside.

The light detection light 7 eyer 30 has a light receiving element 34 as described above.
The light receiving element 34 is connected to a control circuit 37. Further, illumination optical fibers 29 collectively indicated by reference numeral 35 are connected to a light emitting element 36,
This light emitting element 36 is connected to the control circuit 37. When there is no light in the combustion chamber 24, the light detecting light 7 eyeper 30 activates the light emitting element 36 and connects the illumination optical fiber 29.
The interior of the combustion chamber 24 is illuminated by this. Furthermore, when there is light in the combustion chamber 24, the light detection optical fiber 30 detects this and inputs a signal to the light receiving element 34, and the control circuit 37 stops the light emitting element 36 from emitting light. Illumination within the combustion chamber 24 is therefore stopped.

By doing this, the combustion chamber 2
It is now possible to take pictures within 4. That is, the operating state inside the combustion chamber 24 is input to the photographing device 32 via the translucent member 43 and the photographing light 7 eyeper 29, and is photographed over a wide angle range.

For example, regarding the combustion cycle of a four-stroke internal combustion engine, as shown in FIG. 6 (1), among the intake, compression, explosion, and exhaust steps, the inside of the combustion chamber 24 becomes bright from An to B #
, Even in the section where there is an insect, the light inside the combustion chamber 24 is detected by the light detection optical fiber 30 and the light inside the combustion chamber 24 is connected to the illumination optical fiber 2.
Since the light emission of 9 is stopped, it becomes possible to accurately photograph the combustion situation inside the combustion chamber. A timing chart of the light emitting element 36 controlled by the control circuit 37 is shown in FIG.
).

The optical fiber used in the present invention can withstand high temperatures, is flexible, and can withstand vibration well, so that the heating state of the combustion chamber 24 due to combustion heat is different from that of the photographing optical fiber 28 and the illumination optical fiber 2.
9 and the photodetecting optical fiber 30, the return water channel 61 may not be provided.

Effects As described above, according to the present invention, a light-transmitting member defining a combustion chamber, a photographing optical fiber whose one end face faces the combustion chamber through the light-transmitting member, and detecting light from the combustion chamber are provided. Since the light receiving means and the light emitting means for irradiating the combustion chamber with light are provided, it becomes possible to photograph the situation inside the combustion chamber of an actual internal combustion engine. In addition, a control means is provided which responds to the output from the light receiving means and disables the light emitting means when there is light in the combustion chamber and activates the light emitting means when there is no light in the combustion chamber. This makes it possible to reliably photograph the situation inside the combustion chamber even when there is light.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of an embodiment of the present invention, and Fig. 2 is a mounting tube 2.
An enlarged sectional view near 6, Figure 3 is the cutting plane line ■-■ of Figure 2
4 is a sectional view taken from the section line IV-IV in FIG. 13.
Figure 715 is a perspective view of the vicinity of the end of the guide tube 27, and Figure 6 (1) is a 4-cycle internal combustion 8! Graph showing changes in pressure inside the combustion chamber 24 in the process of Seki, No. 6
FIG. 2 is a timing chart showing the operating state of the light receiving element 36, and FIG. 7 is a sectional view showing a typical prior art. 2.18... Schilling head, 3.19... Piston 4.5.43... Translucent member, 12.24... Combustion chamber, 26... Mounting tube, 27... Guide Tube, 28...
- Optical fiber for photographing, 29... Optical fiber for illumination, 3
0... Light detection light 7 eyeper, 32... Photographing device, 3
3... Lighting device 34... Light receiving element, 36... Light emitting element, 37... Control circuit, Agent Patent attorney Number of strokes Keiichi Figure 1 Figure 3 Figure 5

Claims (1)

[Scope of Claims] A light-transmitting member defining a combustion chamber; a photographing optical fiber whose one end face faces the combustion chamber through the light-transmitting member; and a photographing optical fiber facing the other end face of the photographing optical fiber, which a light receiving means for detecting light in the combustion chamber; a light emitting means for irradiating light into the combustion chamber; and a light emitting means responsive to the output from the light receiving means to disable the light emitting means when there is light in the combustion chamber and to disable the light emitting means when there is no light in the combustion chamber. 1. A combustion photographing device for an internal combustion engine, comprising: a control means for activating a light emitting means when the light emitting means is activated.