JPH1164147A - System of detecting water leakage and oil leakage in cylinder of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system of detecting water leakage and oil leakage in a cylinder of an internal combustion engine and which can automatically detect the occurrence and the situation of water leakage and oil leakage in a cylinder, has improved safety property, precisely detects water leakage and oil leakage even if the amount is a little, and which can be assembled through a lessened number of works. SOLUTION: In an internal combustion engine in which the inside of a cylinder and a pressure indicator 6 are connected and which is provided with a gas extracting pipe 4 opened or closed by an indicator valve 5, this system is provided with a gas pipe 4a branched from the gas extracting pipe 4 in the downstream side of the indicator valve 5 and either a photoelectric conversion sensor 7 or a permeability detection sensor connected with the outlet end of the gas pipe 4a and the system detects whether water leakage and oil leakage occurs or not in a gas in the cylinder introduced from the gas pipe 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection system for detecting water leakage and oil leakage in a cylinder of an internal combustion engine.

[0002]

2. Description of the Related Art In a diesel engine, when damage occurs around an intake valve, an exhaust valve, or a fuel injection valve, cooling water or fuel oil enters into a cylinder (inside a combustion chamber 30) and the upper surface of a piston 3 or the like. If a large amount of incompressible liquid is present in the cylinder due to the occurrence of such water leakage and oil leakage, an accident may occur in which the cylinder liner, cylinder cover, etc. are destroyed when the engine is started. . In order to prevent the occurrence of such an accident, in the diesel engine,
Before starting the engine, it checks for water and oil leaks in the cylinders.

On the other hand, in such a diesel engine,
In recent years, automation of turning and air-run (air start) has been demanded. However, in order to cope with this, it is essential to automatically detect water leakage and oil leakage in the cylinder as described above. .

FIG. 8 shows an example of conventional means for detecting water leakage and oil leakage in a cylinder of a diesel engine. In the figure, 1 is a cylinder cover, 2 is a cylinder, 3 is a piston, 30 is a combustion chamber, 4 is a gas extraction pipe for detecting gas pressure in the combustion chamber 30, and 6 is attached to a pipe end of the gas extraction pipe 4. Is a shiatsu. As shown in FIG.
Conventionally, the indicator valve 5 is opened after the acupressure device 6 is removed from the gas extraction pipe 4 and the inspector visually checks the gas 39 ejected from the inside of the combustion chamber 30 at the time of turning or air-run, so that the leakage and oil leakage can be prevented. I was checking for the presence. After the confirmation, the indicator valve 5 is closed, and the acupressure device 6 is attached as needed.

[0005]

However, in the means for injecting gas from the cylinder and visually confirming water leakage and oil leakage as in the above-mentioned conventional means, the following problems are encountered. is there.

(1) Since it is necessary to arrange a worker on the engine side for detecting and confirming water leakage and oil leakage and for attaching and detaching the acupressure device 6, the number of working steps is increased, and there is a concern about safety. .

(2) Since the inspection is performed visually, it is difficult to confirm that the amount of water leakage and oil leakage is small, and the detection accuracy is low.

The present invention has been made in view of the above-mentioned problems of the prior art, and enables the presence or absence of water leakage and oil leakage in a cylinder to be automatically detected, thereby reducing the number of work steps and improving safety.
It is an object of the present invention to provide an in-cylinder water leakage / oil leakage detection system for an internal combustion engine that can accurately detect even a small amount of water leakage / oil leakage.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides, as a first invention, an acupressure device (indicator) for discharging gas from an indicator valve of an internal combustion engine.
At the same time, it is introduced into the photoelectric conversion sensor, and the content of water and oil contained in the gas introduced into the sensor is taken as a change in light transmittance, and the detection of water leakage and oil leakage state in the cylinder is considered. Features. That is, to explain more specifically, in an internal combustion engine that connects the inside of a cylinder and an acupressure device, and has a gas extraction pipe that is opened and closed by an indicator valve, the gas extraction pipe is branched from the downstream side of the indicator valve. A light emitting unit and a light-receiving sensor, which are connected to an outlet end of the gas pipe and through which gas in the cylinder can be introduced, and which detects light and moisture in the gas by passing light through the gas in the cylinder. A light-emitting portion of the sensor is transmitted through the gas, and the transmitted light is received by a light-receiving sensor as a change in light transmittance, and is converted into an electric signal. It is what was constituted.

According to the invention, the gas in the cylinder flows to the photoelectric conversion sensor, and the light emitted from the light emitting portion of the sensor is transmitted through the gas and received by the light receiving sensor, and the electric signal corresponding to the light transmittance is received. Convert to Then, a decrease in light transmittance when there is water leakage / oil leakage is detected, and the presence / absence and amount of water leakage / oil leakage are detected based on the degree of the decrease.

In this case, the distinction between water leakage and oil leakage can be determined by the degree of decrease in light transmittance. In the case of oil leakage, almost no light is transmitted, so that the light transmittance is almost zero. In the case of water leakage, the decrease in light transmittance is smaller than in the case of oil leakage. When water and oil are mixed, the light transmittance is intermediate between the case of only oil and the case of only water.

Therefore, in the present invention, since water leakage and oil leakage can be determined by a change in light transmittance, the number of working steps can be reduced as compared with the prior art. It can be detected quantitatively. Further, in the case of a ship or the like, safety can be improved because water leakage and oil leakage can be detected by a control bridge remotely located from the engine. Furthermore, since the gas pipe branched from the gas extraction pipe is connected to the acupressure device and the sensor, the acupressure device and the sensor can be integrated, and the acupressure device and the sensor can be replaced at the time of startup and operation. Work efficiency is improved.

According to a second aspect of the present invention, a gas ejected from an indicator valve of an internal combustion engine is introduced into a magnetic permeability detection sensor together with an acupressure device (indicator), and is contained in the gas introduced into the sensor. It is characterized in that the contents of water and oil are regarded as a change in magnetic permeability, and water leakage and oil leakage in the cylinder are detected. More specifically, in the internal combustion engine, in the internal combustion engine, a gas pipe branched from a gas extraction pipe downstream of the indicator valve and a gas pipe connected to an outlet end of the gas pipe so that in-cylinder gas can be introduced. And
A hollow body filled with a polymer or the like capable of absorbing and holding a liquid; and an electromagnetic coil wound around the outer periphery of the hollow body, and held in the hollow body by passing the gas in the cylinder through the hollow body. A magnetic permeability detection sensor for detecting a change in magnetic permeability of water and oil in the gas; and detecting a water leak and an oil leak state in the cylinder based on the magnetic permeability change. Also in this invention, the distinction between water leakage and oil leakage can be determined by the degree of decrease in magnetic permeability. In the case of oil leakage, since the oil component is hardly polarized, the magnetic permeability is significantly reduced. In the case of water leakage, the decrease in magnetic permeability is smaller than in the case of oil leakage. When water and oil are mixed, the magnetic permeability is intermediate between the case of only oil and the case of only water. Also, in order to quantitatively detect the amount of water leakage and oil leakage, it is necessary to create a calibration curve in advance.

According to this invention, in addition to the same action (or effect) as the first invention, the water leakage and the oil leakage contain a large amount of carbon derived from incomplete combustion of the combustion, so that the water leakage and the oil leakage are relatively large. There is a change in magnetic susceptibility. Accordingly, since the change in the magnetic permeability appears more remarkably than the change in the light transmittance in the first embodiment, the effect and effect that the water leakage and the oil leakage can be detected with higher accuracy can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 7 is an overall configuration diagram of an in-cylinder water leakage / oil leakage detection system of a diesel engine according to first and second embodiments of the present invention. In FIG. 7, 17 is a diesel engine,
Reference numeral 1 denotes a cylinder cover of the diesel engine 17, and a gas extraction pipe 4 for extracting gas in a cylinder (in the combustion chamber 30) is attached to the cylinder cover 1. The outlet end of the gas extraction pipe 4 is branched into a gas pipe 4b on the acupressure device 6 side and a gas pipe 4a on the sensor side such as a photoelectric conversion sensor 7 or a magnetic permeability detection sensor 11 described later.

The diameters of the gas pipes 4a and 4b are adjusted so that the in-cylinder pressure measurement accuracy of the acupressure device 6 does not decrease, and that the photoelectric conversion or the magnetic permeability detection sensors 7 and 11 accurately detect water leakage and oil leakage. In general, the diameter of the gas pipe 4b to the acupressure device 6 is set to be larger than the diameter of the gas pipe 4a to the photoelectric conversion sensor 7 and the magnetic permeability detection sensor 11. Reference numeral 22 denotes a control bridge in a ship or the like, and the bridge 22 and the photoelectric conversion sensor 7 or the magnetic permeability detection sensor 11 are connected by a wired signal line 20 and a transmission antenna 18 attached to the sensor 7 or 11. Signals can also be transmitted by radio waves 35 between the control antenna 22 and the receiving antenna 29 attached to the control bridge 22.

In the first embodiment of the present invention, a photoelectric conversion sensor 7 is provided as the sensor in FIG. 1 to 3 show an in-cylinder water leakage / oil leakage detection system for a diesel engine according to a first embodiment of the present invention. FIG. 1 is a main part configuration diagram, FIG. 2 is a configuration diagram of a photoelectric conversion sensor, and FIG. 3
FIG. 4 is a relationship diagram between light transmittance and water leakage / oil leakage amount.

In FIG. 1, 1 is a cylinder cover of a diesel engine 17, 2 is a cylinder liner, 3 is a piston,
Reference numeral 30 denotes a combustion chamber, and 4 denotes a gas extraction pipe for extracting gas in the combustion chamber 30. 5 is an indicator valve for opening and closing the line of the gas extraction pipe 4, and the gas extraction pipe 4
On the downstream side (outlet side) of the indicator valve 5, 2
It is branched into two gas pipes 4a and 4b. An acupressure device 6 is connected to the gas pipe 4b on one side, and a photoelectric conversion sensor (hereinafter abbreviated as an optical sensor) to the gas pipe 4a on the other side.
7 is connected. The electric signal from the optical sensor 7 is transmitted to the control bridge 22 by the signal line 20 and the transmitting antenna 18 as shown in FIG.

In FIG. 2 showing the details of the optical sensor 7, reference numeral 8 denotes a transparent tube such as a transparent glass through which light can pass. The transparent tube 8 is connected to the gas tube 4a and passes through the gas tube 4a. Gas 8 such as air passes through the transparent tube 8, but the tip 8 a is formed so that water leakage and oil leakage accumulate in the transparent tube 8.
Or a porous member is attached. A light emitting unit 9 that emits light is installed in front of the transparent tube 8, and a light receiving sensor 10 that receives light passing through the transparent tube 8 and outputs a signal corresponding to the amount of received light is provided behind the transparent tube 8. Is installed. 14a is a power supply of the light emitting unit 9,
14b is a power supply of the light receiving sensor 10. The output signal from the light receiving sensor 10 is transmitted through a signal line 20 to
Alternatively, a transmitting antenna 18 (see FIG.
7) through the control bridge 22 (see FIG. 7).
) Is transmitted to a computer (not shown).

When the indicator valve 5 is opened at the time of turning or air-running of the diesel engine 17, the operation of the diesel engine leakage / oil leakage detection system having the above-described configuration is described. The air is branched into a gas pipe 4b and a gas pipe 4a. The air 32 that has flowed into the gas pipe 4b with the larger pipe diameter reaches the acupressure device 6, so that the pressure in the combustion chamber 30 is correctly detected. Further, the air 31 that has flowed into the gas pipe 4a on the smaller diameter side flows into the transparent pipe 8 of the optical sensor 7, and water leakage and oil leakage contained in the air 31 accumulate in the transparent pipe 8.

On the other hand, light 33 emitted from the light emitting section 9 (for example, a light emitting diode) that emits light at a constant intensity passes through the transparent tube 8 and enters the light receiving sensor 10 (for example, a photoelectric conversion element). At this time, the air 31 is introduced into the transparent tube 8, and when the air contains water or oil due to water leakage or oil leakage, these are introduced into the transparent tube 8.
Therefore, the intensity of the light 34 that passes through the transparent tube 8 and reaches the light receiving sensor 10, that is, the light transmittance decreases, and the output of the light receiving sensor changes according to the light transmittance. The output of the light receiving sensor, which changes according to the light transmittance 34 of the light receiving sensor 10, is transmitted from the signal line 20 or the transmitting antenna 18 to the control bridge 22 (see FIG. 7).

Here, the light transmittance refers to a light receiving output ratio on the light receiving sensor 10 side when the light output from the light emitting section 9 is set to 100%. Even if there is no water leakage or oil leakage, the light transmittance is not necessarily 10
It is not always 0%. The computer of the control bridge 22 calculates the light transmittance based on the output of the light receiving sensor 10 to determine the presence or absence of water leakage and oil leakage and the amount of water leakage and oil leakage in the cylinder.

FIG. 3 shows an example of the light transmittance. In the same figure, A1 indicates a change in light transmittance of oil leakage, and B1 indicates a change in light transmittance of water leakage. In the diagram of FIG.
For adhering to the inner surface initially has passes light, the light transmittance as shown in a ₁ in 3 high. However, if oil leakage has come to some extent retained in the transparent tube 8, it decreases gradually light transmittance as shown in the region of b ₁ in FIG. 3, shown in c ₁ in FIG. 3 at a sufficiently filled stages Thus, the light transmittance becomes almost zero. Water leak B
For the case of only one is the initial adhesion to the transparent tube 8 inner surface is through the light, the light transmittance as shown in a ₁ in 3 high. However, if leakage comes to some extent retained in the transparent tube 8, it decreases gradually light transmittance as shown in the region of b ₁ in FIG. 3, as shown in c ₁ in FIG. 3 at a sufficiently filled stages Although the decrease in light transmittance is constant, the decrease in light transmittance is smaller than that in the case of oil leakage, as shown in the regions b ₁ and c ₁ in FIG. Further, when water leakage and oil leakage have occurred, they are between them. The leakage-oil leakage amount in the range where the is changing in light transmittance of the transparent tube 8 as shown in the region of b ₁ in FIG. 3, quantitatively be evaluated.

As described above, in the first embodiment, gas (air) containing water leakage and oil leakage extracted from the combustion chamber 30 passes through the inside of the transparent tube 8, and light from the light emitting section 9 passes through this gas. The transmitted light is received by the light receiving sensor 10 and the presence or absence of water leakage and oil leakage is determined based on the degree of the sensor output.・ The presence or absence of oil leakage can be detected.

FIGS. 4 to 6 show an in-cylinder water leakage / oil leakage detection system according to a second embodiment of the present invention. In this embodiment, the photoelectric conversion sensor 7 of the first embodiment is used.
Instead, a magnetic permeability detection sensor 11 is provided. Other configurations are the same as in the first embodiment.

That is, in FIG. 4, a gas pipe 4a branched from a gas pipe 4b from the gas extraction pipe 4 to the acupressure device 6 is shown.
Is connected to a magnetic permeability detection sensor 11. The magnetic permeability detection sensor 11 is configured as shown in FIG.
In the figure, reference numeral 28 denotes a tubular hollow body made of a non-magnetic material. The hollow tubular body 28 is filled with a medium 12 capable of absorbing and holding a liquid such as a polymer, and passes through the gas pipe 4b. Gas (air) 31 in the cylinder is introduced into the tubular hollow body 28, and the medium 12 inside the hollow body 28 absorbs and retains water leakage and oil leakage.

Reference numeral 13 denotes an electromagnetic coil wound around the outer periphery of the hollow body 28. A power source 14, an ammeter 15 in series with the power source 14, and a voltmeter 16 are connected in parallel to the coil 13. .

In the water leakage / oil leakage detection system according to the second embodiment, when the indicator valve 5 is opened during turning or air running of the diesel engine 17 as in the first embodiment, the air in the combustion chamber 30 becomes a gas extraction pipe. After flowing into the hollow body 28 of the magnetic permeability detection sensor 11 through the gas pipe 4 and the gas pipe 4a, water leakage and oil leakage contained in the air 31 are absorbed and held by the medium 12 inside the hollow body 28. On the other hand, when the coil 13 is energized by turning on the switch of the power supply 14, the water or oil leak absorbed and held in the medium 12 of the hollow body 28 contains carbon accompanying incomplete combustion. A change in magnetic permeability caused by carbon appears as a change in electromotive force output from the coil 13. The change in the electromotive force of the coil 13 due to the change in the magnetic permeability is transmitted to the control bridge 22 by the signal line 20 or the transmission antenna 18 and displayed on the ammeter 15 or the voltmeter 16. The control bridge 22 determines whether there is water leakage or oil leakage based on the change in the electromotive force. That is, when there is water leakage or oil leakage, the magnetic permeability is lower than when there is no oil or oil leakage.
3 to detect the presence or absence of water leakage and oil leakage and its quantitative value.

FIG. 6 shows an example of the magnetic permeability. In the figure, A indicates an oil leak, and B indicates a water leak. In FIG. 6, in the case of oil leakage, the change in magnetic permeability is small as shown in FIG. A because the oil component is hardly polarized, and in the case of water leakage, the change in magnetic permeability is large as shown in FIG. If the area of a ₂ in FIG. 6 which is in the water leakage or only leak-oil leakage both regions of b ₂ If only the oil leakage is present, a region of the c ₂ shows a case not both leakage-oil leakage. In this embodiment, in order to quantitatively detect the amount of water leakage and oil leakage, a calibration curve is created in advance, and the amount is detected by using the calibration curve in combination with the graph of FIG.

In this embodiment, the change in the magnetic permeability appears more remarkably than the change in the light transmittance in the first embodiment, so that it is possible to detect water leakage and oil leakage with high accuracy.

In the first and second embodiments described above,
The acupressure device 6 and the optical sensor 7 and the acupressure device 6 and the magnetic permeability detection sensor 11 can be housed and integrated in a single case, respectively.

[0033]

As described above, according to the present invention, by transmitting light to the gas in the cylinder or by passing the gas in the cylinder through the electromagnetic coil, water leakage and oil leakage in the gas in the cylinder are automatically prevented. Since the detection is performed, the number of man-hours required is smaller than that in the related art, and the presence or absence of water leakage and oil leakage can be quantitatively detected with extremely high accuracy. In addition, it is possible to detect water leaks and oil leaks at a control bridge remotely located from the engine, thus providing high safety.

According to the second aspect of the present invention, since the magnetic permeability significantly changes due to water leakage and oil leakage, the presence or absence of water leakage and oil leakage can be detected with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an in-cylinder water leakage / oil leakage detection system of a diesel engine according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a photoelectric conversion sensor according to the first embodiment.

FIG. 3 is a relationship diagram between light transmittance and water leakage / oil leakage amount in the first embodiment.

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a magnetic permeability detection sensor according to the second embodiment.

FIG. 6 is a relationship diagram between magnetic permeability and water leakage / oil leakage amount in the second embodiment.

FIG. 7 is an overall configuration diagram of first and second embodiments of the present invention.

FIG. 8 shows water leakage in a cylinder of a conventional diesel engine.
It is a principal part block diagram of an oil leak detection system.

[Explanation of symbols]

 5 Indicator Valve 6 Acupressure Device 7 Photoelectric Conversion Sensor 11 Magnetic Permeability Detection Sensor 17 Diesel Engine 30 Combustion Chamber

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G01M 15/00 G01M 15/00 Z G01N 21/59 G01N 21/59 Z

Claims (2)

[Claims] 1. A gas ejected from an indicator valve of an internal combustion engine is introduced into a photoelectric conversion sensor together with an acupressure device (indicator), and the content of water and oil contained in the gas introduced into the sensor is transmitted. Catch it as a change in light rate,
An in-cylinder water leakage / oil leakage detection system for an internal combustion engine, which detects a state of water leakage and oil leakage in a cylinder. 2. A gas ejected from an indicator valve of an internal combustion engine is introduced into a magnetic permeability detection sensor together with an acupressure device (indicator), and the content of water and oil contained in the gas introduced into the sensor is measured. An in-cylinder water leakage and oil leakage detection system for an internal combustion engine, which detects a water leakage and an oil leakage state in a cylinder, as a change in magnetic permeability.