JPS6146412A - Method for processing blowby gas of internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent atmosphere pollution and pollution of related machinery by introducing a portion of intake air in an air intake pipe into an internal space of an internal-combustion engine and supplying mixed air of the intake air and blowby gas to an exhaust system and by performing mixing process of exhaust gas. CONSTITUTION:Exhaust gas exhausted from a combustion chamber 11 of a cylinder 5 is fed from an exhaust valve 13 to a turbo charger 16 through an exhaust pipe 15 to turn a turbine 21 and discharged from an exhaust pipe 18. A compressor 22 is driven by rotation of the turbine 21 to pressurize intake air from an air cleaner 17 previously and fed to the combustion chamber 11 from an air intake pipe 14 through an air intake valve 12. In this case, a portion of the intake air from the compressor 22 is fed to a crank room 8 through a branch pipe 31 and mixed with blowby gas leaked from the combustion chamber 11. And the mixed gas is discharged to the exhaust pipe 18 through a breezer pipe 35 to burn blowby gas by exhaust gas.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a blow-by gas treatment method for an internal combustion engine equipped with a turbocharger.

b. Conventional technology Conventionally, in an internal combustion engine, gas leaking into the crank chamber through the gap between the piston ring and the inner wall of the cylinder in the combustion chamber, that is, blow-by gas, has been treated (11) by exhausting the generated blow-by gas. There are two methods: (2) releasing the generated blow-by gas directly into the atmosphere in a separate system from the gas, and (2) returning the generated blow-by gas to the intake system (in the case of a turbocharger, the intake side) and re-burning it. It has been taken.

Problems to be Solved by the C0 Invention However, the method (1) above has the problem of polluting the atmosphere because the blow-by gas contains harmful components such as unburned gas HC, Co, and NoX. occurs. Therefore, the method shown in (2) above has been adopted in some automobiles, but for internal combustion engines for ships and private power generation where there are no particular regulations, it must be installed separately in the engine room or indoors. There was a problem in that it was necessary to provide a dedicated pipe for exhausting blow-by gas, and that two exhaust pipes had to be provided in addition to one for combustion exhaust gas.

On the other hand, in method (2), the blow-by gas and the fine particles of lubricating oil contained in this girth adhere to and contaminate various parts of the air cleaner and turbocharger, thereby accelerating clogging of the air cleaner and causing the turbocharger to become clogged. reducing the a-capacity of the charger and thus reducing the intake efficiency of the internal combustion engine;
This resulted in decreased performance and worsened fuel efficiency. Furthermore, in order to prevent these situations from occurring, there is a problem in that the maintenance cycle must be accelerated.

d1 Means for Solving the Problems The present invention has been made in view of the above circumstances, and solves the problems of the conventional method, does not pollute the atmosphere, does not require a dedicated exhaust pipe, and also solves the above-mentioned problems. The present invention aims to provide a blow-by gas treatment method for a turbocharged internal combustion engine that eliminates the problem of equipment contamination.

That is, the present invention guides a portion of the intake air in the intake pipe pre-pressurized by the turbocharger into the internal space of the internal combustion engine where blow-by gas leaks, and directs the mixture with the introduced charge air blow-by gas from the combustion chamber. This is a blow-by gas treatment method for an internal combustion engine equipped with a turbocharger, characterized in that the gas is supplied to an exhaust system leading to an exhaust pipe via a turbocharger and mixed with exhaust gas.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The figure conceptually shows an internal combustion engine to which the present invention is applied, where l is a cylinder block, 2 is a cylinder head, 3 is a cylinder cover, 4 is a stone, 5 is a cylinder, and 6 is a cylinder block.
1 is the connecting rod, 7 is the crankshaft, 8 is the crank chamber, 9 is the oil pan, 11 is the combustion chamber above the piston 4, 12 is the intake valve, 13 is the exhaust valve, 14 is the intake pipe, 15 is the exhaust pipe, 16 is the A turbocharger, 17 is an air cleaner.

The turbocharger 16 includes a turbine 21 and a compressor 22 coaxially, and the end of the exhaust pipe 15 is connected to the turbine 2.
1, the end of the intake pipe 14 is connected to the outlet 24 of the compressor 22, and the air cleaner 17 is connected to the inlet 25 of the compressor 22. 18 is an exhaust pipe provided in the turbine 21.

31 is a branch pipe that branches from the intake pipe 14 and opens into the inside of the cylinder block l, that is, into the crank chamber 8;
35 is a breather pipe that supplies blow-by gas discharged from the cylinder head cover 3 to the exhaust pipe 18 of the turbine 21. In this embodiment, an example is shown in which the end of the breather pipe 35 is connected to the exhaust pipe of the turbocharger 16, but the end of the breather pipe 35 is connected from the combustion chamber 11 to the turbine 2 of the turbocharger 16. exhaust pipe 1
5 or to an exhaust gas path within the turbocharger 16.

00 action Exhaust gas that explodes and burns in the combustion chamber 11 of the cylinder 5 passes from the exhaust valve 13 through the exhaust pipe 15 to the turbocharger 1.
6, and after rotating the turbine 21, is discharged from the exhaust pipe 18. The rotation of the turbine 21 drives the compressor 22, and therefore the air cleaner 1
7 (including the carburetor) is pre-pressurized and sent from the intake pipe 14 to the combustion chamber 11 via the intake valve 12. Explosive combustion takes place here, and the above process is repeated.

On the other hand, a part of the intake air pressure-fed from the compressor 22 of the turbocharger 16 is sent into the inside of the cylinder block 1, that is, into the crank chamber 8, through a branch pipe 31 branched from a part of the intake pipe 14. There is blow-by gas leaking from the combustion chamber 11, and while the intake air is mixed with this blow-by gas, this gas is forced into the cylinder 7.
The air is discharged from the upper part of the door cover 3 through the breather pipe 35 to the exhaust pipe 18 of the turbocharger 16. Exhaust pipe 1 here
High within 8? The blow-by gas is combusted by the exhaust gas at ML (for example, 500° C. to 600° C.) and is discharged.

f6 Effects of the Invention As described above, the method according to the present invention takes advantage of the fact that the supercharging pressure by the turbocharger, which is a characteristic of a turbocharged internal combustion engine, is always higher than the exhaust pressure at the exhaust gas outlet of the turbocharger. The method of the present invention aims to effectively treat blow-by gas, and the following effects can be achieved by the method of the present invention.

(1) Blowby gas is forcibly discharged into high-temperature exhaust gas and combusted, which prevents air pollution. No longer needed.

(2) It is possible to prevent the conventional problems caused by blow-by gas being sucked into the intake side of a turbocharger, such as clogging of the air cleaner, contamination of the turbocharger, functional deterioration due to adhesion of dirt, and deterioration of fuel efficiency.

(3) The maintenance cycle for dirt adhesion on the intake side can be extended longer than before, making maintenance 6? i becomes easy.

(4) Since fresh air is forcibly supplied to the crank chamber in the cylinder block, deterioration of lubricating oil due to residual blow-by gas can be prevented.

[Brief explanation of the drawing]

The figure is an explanatory diagram of a turbocharged internal combustion engine to which the method according to the present invention is applied. 1... Cylinder block, 5... Cylinder,
14... Intake pipe, 15.18... Exhaust pipe, 21... Turbocharger turbine, 22...
...Turbocharger compressor, 31... Branch pipe, 35... Breather pipe. Procedural Amendment 1) September 21, 1980 Manabu Shiga, Commissioner of the Patent Office, Patent Application No. 168216 of 1982 2, Name of the invention Method for treating blow-by gas in internal combustion engines 3, Relationship with the person making the amendment case Patent applicant name: Akihiro Akahori 4, agent
〒107 (2 other people) 5. Subject of amendment Contents of amendments to each column of “Claims” and “Detailed Description of the Invention” in the clear ms (1) The scope of claims in the specification should be changed as shown in the attached sheet. correct. (2) The words "exhaust gas" on page 2, line 16, page 4, line 1 from the bottom, page 5, line 2, and line 20 of the same are corrected to "exhaust gas." (3) On page 3, line 12, the phrase "air intake in the intake pipe" is corrected to "air supply in the intake pipe." (4) "Turbine 2" on the 3rd to 2nd lines from the bottom of page 4
The text has been corrected to read "Turbine 21." (5) On page 5, line 12 and line 16, the words "intake" are corrected to "air supply." (6) "Cylinder block" on the 4th line from the bottom of page 6
Correct that to "cylinder block." Claims: A part of the intake air pre-pressurized by the turbocharger is guided into the internal space of the internal combustion engine where the probe gas leaks,
A turbocharged internal combustion engine characterized in that the mixture of the introduced supply air and the blow-by gas is supplied from the combustion chamber to the exhaust system leading to the exhaust pipe via the turbocharger and mixed with the exhaust gas. blow-by gas treatment method. Procedures (Ho Zheng ε: (spontaneous) October 4, 1981, 1, Indication of the case, 1982 Patent Application No. 168216, 2, Name of the invention, Method for treating blow-by gas in internal combustion engines 3, Person making the amendment, and Relationship Patent applicant name Shoyo Akahori 4, agent 107 (2 idiots) Contents of amendment (1) Corrected in content (2) of amendment to written procedural amendment submitted on September 21, 1980 The entire text has been deleted and the following correction has been made: "Exhaust gas" is added to page 2, line 16, line 1 from the bottom of page 4, line 2, page 5, and line 20 of the specification. is corrected to "exhaust gas".

Claims (1)

[Claims] A part of the intake air in the intake pipe pre-pressurized by the turbocharger is guided into the internal space of the internal combustion engine where blow-by gas leaks, and the mixture of the introduced intake air and blow-by gas is sent from the combustion chamber to the exhaust pipe via the turbo charger. A blow-by gas treatment method for an internal combustion engine with a turbocharger, characterized in that the blow-by gas is supplied to an exhaust system leading to the exhaust gas and mixed with exhaust gas.