JPS6299664A - Internal combustion engine - Google Patents

Abstract

PURPOSE:To achieve the enhancement in the efficiency and the miniaturization of an oxygen content enriching unit by connecting a heat exchanger for cooling lubricating oil to the inlet side of an oxygen content enricher, and connecting an induced draft fan to the outlet side thereof. CONSTITUTION:An oxygen content enriching unit 4 is connected to an intake pipe 18 on the downstream side of a throttle valve 22 via a connecting pipe 24. The unit A consists of an oxygen concentration enricher 27, the interior of whose housing 26 is constituted by a polymer or the like so as to be membranous or tubular shape, a heat exchanger 28 for cooling lubricating oil connected to the inlet side thereof, and an induced draft fan 25 connected to the outlet side thereof. When the throttle valve 22 is closed at the start of an engine or in a low load region, the induced draft fan 25 is driven, and a part of air heated through the heat exchanger 28 heats the enricher 27 and is exhausted to the outlet, and the remainder dissolves the separation membrane of the enricher 27. Thus, the enhancement in the efficiency as well as the miniaturization of the unit A can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an internal combustion engine with good intake air filling efficiency.

[Prior art] The heat-insulating section in which the walls of the combustion chamber are made of heat-resistant materials such as ceramics improves thermal efficiency by preventing the heat generated inside the cylinder during the compression stroke and heat generation period from being released to the outside. At the same time, thermal energy can be recovered by supplying high-temperature exhaust gas to a turbocharger.

However, in this type of adiabatic engine, heat moves to the wall of the combustion chamber, and when the wall temperature rises, the intake air heats and expands inside the cylinder, reducing the intake air density and reducing the intake air filling efficiency. It is known that when heat is generated, the fuel premixture is not accumulated, making it easy to ignite on the high-temperature wall surface, reducing the isovolumic combustion degree and reducing engine performance.

In order to solve these problems, it is required to improve the intake air filling efficiency and increase the fuel combustion rate. In order to increase the combustion rate, it is generally considered effective to increase the fuel injection rate of the fuel injection pump and to perform combustion in high-temperature compressed air. However, microscopically, there is a limit to the combustion reaction depending on the oxygen concentration of the air surrounding the fuel spray. Therefore, the temperature of the combustion chamber is not limited (as it withstands higher temperatures compared to conventional engines)! In Netsuiso Seki, by increasing the oxygen concentration in the air, the reaction becomes more active and the combustion rate can be increased.

By the way, as disclosed in JP-A-60-11667, for example, an oxygen concentration enrichment device is connected between the air creep and the throttle valve, and the negative It is disclosed that pressure is applied to the oxygen concentration enrichment device to supply oxygen-enriched air from the oxygen concentration enrichment device to the engine. According to this prior art, oxygen i1
The oxygen enrichment device and the air cleaner can be integrated into a small size, and by supplying oxygen-enriched air, the flammability of the fuel can be improved, the combustion speed can be increased, and the ZC and CO in the exhaust gas can be improved. It is possible to reduce harmful components such as In general, combustion is stabilized during idling, which allows the engine speed and air-fuel ratio to be lowered, significantly improving fuel efficiency.

By the way, the reaction efficiency of the oxygen arx enrichment device changes depending on the temperature. When the 'P3yA'a enrichment device is integrated with the air cleaner as in the above conventional technology,
To forcefully raise the intake air temperature, another heat source is required.
The structure is also complicated.

[Problems to be Solved by the Invention] Therefore, the purpose of the present invention is to activate the enricher of the oxygen concentration enrichment device by using the engine's Al lubricating oil cooler (oil cooler) as a heating means, and to achieve a compact and separate system. The objective is to provide an economical internal combustion engine steeped in efficiency.

[Means for Solving the Problem 1] In order to achieve the above object, the configuration of the present invention is to combine a lubricating oil cooling heat exchanger on the inlet side of the oxygen i1 enricher and a suction fan on the outlet side. The oxygen enrichment unit is connected to the intake pipe.

[Function] Then, the oxygen-enriched air whose oxygen concentration has been increased by the oxygen concentration enricher 27 enters the intake pipe 1 through the connecting pipe 24, and flows from the intake port 1 to the cylinder, that is, the headliner 14 and the piston crown 13. It is sucked into the surrounding tAl. At the end of combustion, since the oxygen degree of the intake air is high, the ignitability of the fuel is improved and a good combustion state is obtained. In addition, the substantial increase in intake air volume promotes the production of pre-iIP air gas and increases the combustion rate, making it possible to increase engine output and improve thermal efficiency. Since the thermal energy is supplied to a machine, etc., the recovery efficiency of thermal energy is improved.

[Examples of the Invention] The present invention will be described based on Examples. As shown in FIG. 1, an internal combustion engine has a cylindrical portion on the lower surface of a metal cylinder head 15, and an inverted cup-shaped ceramic helad liner 14 is fitted and supported in the cylindrical portion. A cylinder liner 7 made of ceramics is fitted into the body 8, the headliner 14 and the cylinder liner 7 are butted against each other so that they form a continuous cylinder, and the cylinder head 15 is connected to the cylinder body 8 with bolts 2. It is composed of The lower end of the cylinder body 8 is closed by an oil pan 2, and the cylinder head 15
supports an intake valve 16 and an exhaust valve (not shown);
A valve mechanism represented by a camshaft 17 opens and closes the intake and exhaust valves. This valve operating mechanism is covered by a cover 30 connected to the upper side of the cylinder head 15.

On the other hand, the screw 1-10 aligns the piston crown 13 made of ceramics on the upper surface of the piston body 12 made of IL material,
and is formed by bonding with pol l-.

A connecting rod 6 is connected to the screw body 10 by a piston pin 9, and is connected to a pin 5 of an arm 4 of a crankshaft 3 in a known manner.

Combustion is thermally insulated by the inverted cup-shaped helad liner 14 and the piston crown 13, and preferably 6 ceramic is coated on the surfaces of the intake and exhaust valves and the surfaces of the intake and IJ air valves.

While the air cleaner 13 is connected to the end of the intake pipe 18 that connects to the intake boat, a throttle box 22 is disposed in the middle, and a lever 21 connected to this valve shaft 22a is connected to a rod 20 of one Acuna Coator. Ru. The actuator 19 is activated based on output signals from a microcomputer that responds to signals such as negative pressure downstream of the throttle valve 22, engine speed, and cooling water temperature.
is controlled. In particular, the throttle valve 22 is in a throttled state when the engine is operating at 98 degrees and in a low load range.

According to the present invention, the oxygen concentration enrichment unit A is connected to the intake pipe 18 downstream of the throttle valve 22 via the connecting pipe 24. M material depth enrichment unit A IJ Poly! is inside the cylindrical housing 26! In the center, there is an oxygen enricher 27 in the form of a film or pipe, a heat exchanger 28 for cooling lubricating oil on one side, and a suction fan 25 on the other side.
It is constructed integrally by arranging them respectively.

Next, the operation of an internal combustion engine equipped with an oxygen enrichment unit according to the present invention will be explained. When the actuator 19, preferably an electromagnetic actuator, is energized and the C rod 20 is attracted when the engine is started and in a low load range, the throttle valve 22 is closed as shown. At the same time, the suction fan 25 is driven, and a part of the heated air passes through the lubricating oil cooling heat exchanger 28 and heats the oxygen yA enricher 27, and is discharged to the left side outlet by the suction fan 25. At the same time, the remaining oxygen and nitrogen in the air are oxygen-concentrated Yg, and the concentration of the enricher 27 is 11g! dissolve in As is known, oxygen and nitrogen diffuse and move inside the enrichment membrane based on the pressure difference between the inner and outer surfaces of the enrichment membrane, and -C is desorbed inside this membrane, so that the oxygen a degree is more than 2.3 times that of nitrogen. High a-rich air is produced. Then, the M oxygen air whose oxygen concentration has been increased in the oxygen concentration enricher 27 enters the intake pipe 18 from the connecting pipe 24, and passes from the intake boat to the cylinder, i.e., the tube 14 and the screw 1 crown 13. is drawn into the combustion chamber surrounded by

In the combustion chamber, since the intake air has a high oxygen content, the ignitability of the fuel is improved and a good combustion condition is obtained.

As described above, the present invention introduces oxygen-enriched air from an oxygen concentration enrichment unit into an adiabatic engine in which combustion temperature is not limited, so that even if the amount of fuel injection required to start the engine is increased, oxygen in the intake air remains Since the concentration is high, four-fire combustion can be easily obtained with a normal amount of intake air, and a good combustion state can be obtained, making it possible to improve startability.

In addition, the substantial increase in intake air volume promotes the generation of prehumidified air and increases the combustion rate, making it possible to increase engine output and improve thermal efficiency, while also directing hot exhaust gas to turbocharging. Since the thermal energy is supplied to a machine, etc., the recovery efficiency of thermal energy is improved.

Furthermore, since the nitrogen component in the intake air is reduced, even if the combustion temperature becomes high, the amount of NOx, which is a harmful component, generated can be suppressed.

Incidentally, the present invention can also be applied to an ordinary internal combustion engine to obtain similar effects (τ).

[Effects of the Invention] According to the present invention, a heat exchanger (oil cooler) for cooling lubricating oil that lubricates an engine, which is conventionally provided in an engine, is provided.
Since it is configured as an integrated unit that combines the oxygen concentration enrichment unit on one side and the suction fan on the other side, it is possible to minimize the increase in cost 1- and does not require external heat energy. Since the intake air temperature is increased without
The separation efficiency of the xS degree enrichment unit has been improved, making it possible to supply high oxygen 1 degree air to the engine in a smaller size compared to conventional models, eliminating the problem of reduced intake air filling efficiency, which is a problem especially with internal combustion engines. be able to.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing a schematic configuration of an internal combustion engine according to the present invention. △: Oxygen concentration enrichment unit 18: Intake pipe 19: Actuator 22: Throttle valve 23: Air cleaner 25: Suction fan 27: Oxygen enricher 16:
Intake valve 28: Heat exchanger for lubricating oil cooling UL

Claims (1)

[Claims] An internal combustion engine characterized in that an oxygen concentration enrichment unit is connected to an intake pipe, the oxygen concentration enrichment unit having a lubricating oil cooling heat exchanger connected to the inlet side of the oxygen concentration enricher and a suction fan connected to the outlet side of the oxygen concentration enrichment device.