JP2014114713A - Blow-by gas treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blow-by gas treatment device on which deposits of particulate matters contained in oil mist are hardly formed.SOLUTION: A blow-by gas treatment device 50 includes gas introducing means (passage parts 51-54) for introducing blow-by gas (black arrowheads) containing oil particles into an intake passage 31 of an engine 10, and oil electrically-charging means (an oil electrically-charging device 55) for performing positively charging treatment and negatively charging treatment to the blow-by gas. The gas introducing means introduces both the blow-by gas (gas passing through the passage part 51) to which the positively charging treatment is performed and the blow-by gas (gas passing through the passage part 52) to which the negatively charging treatment is performed, into the intake passage.

Description

  The present invention relates to a blow-by gas processing apparatus having a configuration for introducing blow-by gas of an internal combustion engine into an intake passage.

  Conventionally, by introducing (recirculating) blow-by gas of an internal combustion engine (hereinafter also simply referred to as “engine”) into the intake passage, it is possible to prevent the gas pressure in the crankcase from excessively rising. A system to ventilate the gas has been proposed. This type of system is also called a blow-by gas processing apparatus or PCV (positive crankcase ventilation) (see, for example, Patent Document 1).

JP 2007-187033 A JP 2007-198344 A

  Blow-by gas is generated when gas in the combustion chamber (such as unburned mixture and exhaust gas after combustion) passes between the piston ring and the cylinder wall surface and leaks into the crankcase. Due to this generation process, blow-by gas generally contains fine particles (particulate matter) such as soot. The size of this type of particulate matter is about 0.1 μm in particle size.

  On the other hand, in the crankcase, oil particles of various sizes are generally generated due to physical collision between engine oil (lubricating oil) and a member such as a crankshaft and evaporation of the oil itself. Has occurred. The size of this type of oil particle is about 0.5 to 5 μm in particle size, which is larger than the size of the particulate matter. When the particulate matter comes into contact with the oil particles, as shown in FIG. 8A, the particulate matter PM is taken into the oil particles OP and dispersed in the oil particles OP.

  The blow-by gas in the crankcase generally contains a large amount of oil particles containing particulate matter as described above (so-called oil mist). When this blow-by gas is introduced into the intake passage by the blow-by gas processing device, depending on the environment in the intake passage (for example, in a high temperature environment caused by the operation of the supercharger), it is shown in FIG. As described above, part of the oil component (for example, a component having a low boiling point and easily evaporated) constituting the oil particle OP may be evaporated. When the oil component evaporates in this manner, as shown in FIG. 8C, the size of the oil particles OP becomes smaller (smaller diameter), the degree of filling of the particulate matter into the oil particles increases, and the oil particles Also increases the viscosity.

  When the oil particles having increased viscosity come into contact with a member constituting the intake passage (hereinafter also referred to as “intake passage constituent member”), as shown in FIG. May adhere to. Then, as the oil component further evaporates from the oil particles adhering to the intake passage constituting member, the oil particles may become solid or gel as shown in FIG.

  As described above, a mixture derived from oil and particulate matter (hereinafter also referred to as “deposit”) may be generated on the intake passage component due to the treatment of blow-by gas.

  The occurrence of deposits on the intake passage components is not preferable from the viewpoint of operating the engine properly. For example, if an excessively large amount of deposit is generated in the intake port, the intake valve, etc., the proper inflow of gas into the combustion chamber may be hindered, resulting in a decrease in fuel consumption and an increase in emissions. Further, for example, in an engine equipped with a supercharger, if an excessive amount of deposit is generated in a diffuser of a compressor of the supercharger, the efficiency of the supercharger may be lowered.

  Here, the deposit generation amount will be described. It is considered that the deposit generated in the intake passage constituting member is caused by the oil particles contained in the blow-by gas being heated to increase the viscosity of the oil particles as described above. Here, considering the amount of heat that a unit amount of oil receives per unit time (the total amount of heat that individual oil particles receive per unit time when the unit amount of oil is divided into a number of oil particles), The smaller the size of the oil particles (the oil particles before being heated and reduced in size), the larger the total oil particle surface area (the sum of the areas where individual oil particles receive heat). The amount of heat will be large. Based on this study, it is considered that the larger the amount of “small” oil particles contained in the blowby gas, the more oil particles with higher viscosity are produced, and the deposit is “easy to occur”.

  On the contrary, as understood from the above description, the larger the amount of oil particles contained in the blow-by gas is, the less oil particles with higher viscosity are generated, and the deposits are less likely to occur. It is thought that it becomes. In addition, when oil particles with a large size (oil particles with a relatively low degree of particulate matter filling even when heated) come into contact with existing deposits, the deposits are taken into the oil particles. However, it is considered that a phenomenon in which the deposit is removed from the intake passage constituent member also occurs. Thus, it is considered that oil particles having a “large” size are not only difficult to become deposits, but also have an effect of removing existing deposits.

  Therefore, in order to reduce the amount of deposit generated as much as possible, for example, for the oil particles contained in the blowby gas, the amount of “small” oil particles is reduced and the size of “large” oil particles is reduced. It is considered preferable to increase the amount. That is, it is considered preferable to relatively increase the amount of “large” oil particles.

  However, as described above, the oil particles are generated due to collision between the oil and other members, evaporation of the oil itself, and the like. Therefore, it is generally considered difficult to manipulate the oil particle size distribution (the relationship between the oil particle size and the number of oil particles) at the stage where the oil particles are generated. In other words, the oil particle size distribution at the oil particle generation stage is considered to be determined in relation to the structure of the engine, the operating condition of the engine and the characteristics of the lubricating oil itself. It does not necessarily match a preferable distribution from the viewpoint of reducing.

  Therefore, if the blow-by gas in the crankcase is inadvertently introduced into the intake passage, a large amount of deposit is generated on the intake passage constituent member (for example, an amount exceeding an allowable level in view of properly operating the engine). There is a fear.

  In view of the above problems, an object of the present invention is to provide a blow-by gas processing apparatus capable of reducing the amount of deposit generated due to blow-by gas as much as possible.

A blow-by gas processing apparatus according to the present invention for solving the above-mentioned problems is
"Gas introduction means" for introducing blow-by gas containing oil particles, which are fine particles derived from the lubricating oil of the internal combustion engine, into the intake passage of the internal combustion engine;
“Oil” performing a positive charging process for positively charging at least some of the oil particles contained in the blowby gas and a negative charging process for negatively charging at least some of the oil particles contained in the blowby gas. Charging means,
It has.

Furthermore, in the blow-by gas processing apparatus according to the present invention,
The gas introduction means includes both a “first gas” that is a blow-by gas that has been subjected to the “positive” charging process and a “second gas” that is a blow-by gas that has been subjected to the “negative” charging process. Is introduced into the intake passage.

  With the above configuration, the blow-by gas is processed by the oil charging means before being introduced into the intake passage. Oil particles positively charged through the positive charging process by the oil charging means (see the first gas) and oil particles negatively charged through the negative charging process (see the second gas) are caused by Coulomb force. Has the property of attracting each other. Therefore, if the positively charged oil particles and the negatively charged oil particles are present in the same space, the oil particles can attract each other and come into contact with each other and be combined into one oil particle. At this time, the size of the oil particles after being combined is larger than the size of each oil particle before being combined. Therefore, with the above configuration, the size of the oil particles contained in the blow-by gas can be increased (increasing the diameter of the oil particles).

  That is, with the above configuration, the distribution of the size of the oil particles in the intake passage is compared with the case where the blow-by gas is simply introduced into the intake passage (as compared with the case where the oil particles are not enlarged). Can be approximated to a “distribution of relatively large oil particles” (distribution to reduce the amount of deposit generated).

  Therefore, the blow-by gas processing apparatus of the present invention can reduce the amount of deposit generated due to the blow-by gas as much as possible.

  By the way, the above “gas introduction means” only needs to have a configuration capable of introducing (refluxing) blow-by gas (both the first gas and the second gas) into the intake passage. There are no particular restrictions on the specific method of introducing the air into the intake passage. For example, when introducing the first gas and the second gas into the intake passage, the gas introduction means mixes the first gas and the second gas before introducing them into the intake passage and introduces the mixed gas into the intake passage. Alternatively, the first gas and the second gas may be individually introduced into the intake passage and may be mixed in the intake passage. Specific embodiments of the gas introduction means will be described later (see the following embodiments 1 to 7).

  The “oil charging means” only needs to have a configuration capable of positively or negatively charging the oil particles as described above. The specific charging method, arrangement, number of oil charging means, and oil charging means The number of times the positive charging process and the negative charging process are performed is not particularly limited. For example, as an oil charging means, a charge applying device configured to charge oil particles using corona discharge generated around a needle-like electrode provided in a flow path of blow-by gas (for example, a patent) The device described in Document 2 for applying a negative charge to the oil particles can be employed. As is well known, if negative corona discharge (corona discharge generated around the negative electrode) is used, a negative charge can be applied to the object, and positive corona discharge (corona discharge generated around the positive electrode). Can be used to impart a positive charge to the object.

  More specifically, the oil charging means includes, for example, a positive needle-like electrode and a negative needle-like electrode, and applies the predetermined positive voltage to the positive needle-like electrode to thereby perform the “positive charging process”. And performing the “negative charging process” by applying a predetermined negative voltage to the negative needle electrode. In addition, for example, the oil charging means includes a single needle-like electrode, and sequentially applies a positive voltage and a negative voltage to the single needle-like electrode, thereby performing a “positive charging process” and a “negative charging process”. "In order. As described above, the oil charging unit may be configured to perform a positive charging process and a negative charging process using a single electrode, or may be configured to perform these processes using a plurality of electrodes. .

  The “positive charging process” is a process for positively charging at least a part of the oil particles contained in the blow-by gas to be processed. Therefore, the first gas (blow-by gas subjected to the positive charging process) can include not only positively charged oil particles but also uncharged oil particles. Similarly, the “negative charging process” is a process of negatively charging at least part of the oil particles contained in the blow-by gas to be processed. Therefore, the second gas (blow-by gas subjected to the negative charging process) can include not only negatively charged oil particles but also uncharged oil particles.

  Therefore, as understood from the above description, the expression “oil charging means for performing a positive charging process and a negative charging process for the oil particles contained in the blow-by gas” is, for example, In other words, it can be rephrased as oil charging means for positively charging “one part” of oil particles contained in blow-by gas and negatively charging “a part of another part different from the one part”.

  Hereinafter, some embodiments (embodiments 1 to 8) of the blow-by gas processing apparatus of the present invention will be described.

・ Mode 1
As described above, the gas introduction means only needs to have a configuration capable of introducing blow-by gas (both the first gas and the second gas) into the intake passage. The specific structure is illustrated below (modes 1-7).

For example, as one configuration, in the blow-by gas processing apparatus of the present invention,
The gas introduction means mixes the first gas and the second gas before the first gas and the second gas are introduced into the intake passage, and the mixed first gas and second gas are mixed. Gas can be configured to be introduced into the intake passage.

  With the above configuration, a gas (mixed gas) obtained by previously mixing the first gas and the second gas is introduced into the intake passage. As a result, the mixed gas in which the distribution of the size of the oil particles is a distribution for reducing the amount of deposit generated (or approaches the distribution) can be introduced into the intake passage.

・ Aspect 2
In the aspect 1, the specific method for mixing the first gas and the second gas is not particularly limited.

  For example, the gas introduction unit divides the flow of the blow-by gas into two flows, the blow-by gas belonging to one flow is subjected to the positive charging process, and the blow-by gas belonging to the other flow is subjected to the negative charging process. After being applied, the first gas and the second gas may be mixed by combining the two flows.

  As understood from the above description, the blow-by gas after the positive charging process is performed on the “blow-by gas belonging to one flow” corresponds to the first gas, and the “blow-by gas belonging to the other flow” The blow-by gas after the negative charging process is performed corresponds to the second gas.

  In addition, the specific method of mixing the first gas and the second gas is not limited to the method of the above aspect 2. For example, as another specific method, the blow-by gas is allowed to flow without being divided, and a part of the flow is subjected to a positive charging process and the other part is subjected to a negative charging process (or more actively thereafter). A method of mixing the two (by stirring or the like) may be employed. Furthermore, for example, as another specific method, while the blow-by gas is allowed to flow without being divided, the positive charging process and the negative charging process are alternately performed on the flow (or after that, the mixture is further actively stirred or the like). A method of mixing the two).

・ Aspect 3
When the first gas and the second gas are mixed, it is preferable that the positively charged oil particles and the negatively charged oil particles are mixed so as to make contact and bonding as easy as possible.

For example, as one method, in the blow-by gas processing apparatus of the present invention,
The gas introduction means may be configured to mix the first gas and the second gas by joining the flow of the first gas and the flow of the second gas so as to face each other.

  With the above configuration, at the position where the first gas and the second gas are mixed (hereinafter also referred to as “mixing position”), the first gas and the second gas collide and diffuse, and both are complicated. It will be mixed. As a result, the first gas flow and the second gas flow are positively charged in the first gas as compared with the case where the first gas flow and the second gas flow are merged so that they do not face each other (for example, the flows are almost parallel). It is thought that the frequency with which oil particles and the negatively charged oil particles contained in the second gas come into contact / bonding increases. Therefore, with this configuration, the increase in the diameter of the oil particles is further promoted, and the amount of deposit generated due to blow-by gas can be further reduced.

  As understood from the above description, the expression “merge so as to face each other” means, for example, that the first gas flow direction and the second gas flow direction are opposite to each other. In other words, the second gas is merged. The expression can also be paraphrased as merging the first gas and the second gas so that the angle formed by the flow direction of the first gas and the flow direction of the second gas is an angle in the vicinity of 180 degrees. Furthermore, the same expression can be paraphrased as merging the first gas and the second gas so that the first gas and the second gas collide from the front.

・ Aspect 4
Alternatively, as another method, in the blow-by gas processing apparatus of the present invention,
In the vicinity of the position where the first gas and the second gas are mixed, at least one of the effective cross-sectional area of the flow path of the first gas and the effective cross-sectional area of the flow path of the second gas is mixed. It can be configured to become smaller as it approaches the position.

  With the above configuration, generally, if the flow rate of blow-by gas is the same, the flow velocity increases as the effective cross-sectional area of the flow path decreases. Therefore, the flow velocity of at least one of the first gas and the second gas increases as the mixing position is approached. . That is, the flow velocity of at least one of the first gas and the second gas toward the mixing position can be increased. And the larger the flow velocity of at least one of the first gas and the second gas, the more complicated the two are mixed at the mixing position. As a result, compared with the case where the flow rates of the first gas and the second gas are not increased (for example, when the effective cross-sectional areas of the first gas flow path and the second gas flow path are uniform in the vicinity of the mixing position), It is considered that the frequency with which the positively charged oil particles contained in the first gas contact and combine with the negatively charged oil particles contained in the second gas is increased. Therefore, with this configuration, the increase in the diameter of the oil particles is further promoted, and the amount of deposit generated due to blow-by gas can be further reduced.

  By the way, the above “effective cross-sectional area of the flow path” is the basis for calculating the amount of blow-by gas that passes through the flow path per unit time when the pressure difference between both ends of the flow path is a unit pressure difference. Any known cross-sectional area may be used, and various well-known definitions may be adopted as the definition of the cross-sectional area. The effective cross-sectional area of the flow path can be calculated based on the structure of the flow path (for example, the diameter of the flow path, the shape of the flow path, whether or not it has an orifice-like portion), and the like.

・ Aspect 5
Or as still another method, in the blow-by gas processing apparatus of the present invention,
In the vicinity of the position where the first gas and the second gas are mixed, a protrusion projecting from the member defining the flow path of the first gas into the flow path, the flow of the second gas A protrusion projecting into the flow path from the member defining the path, and projecting into the flow path from the member defining the flow path of the mixed first gas and the second gas At least one of the raised protrusions.

  With the above configuration, the flow of the blow-by gas is disturbed by the convex portion, so that the flow of the first gas, the second gas, or the mixed first gas and the second gas flows in the vicinity of the mixing position. Disturbed. In the vicinity of the mixing position, the first gas and the second gas are mixed in a complicated manner. As a result, compared to the case where the flow of the blow-by gas is not disturbed, the frequency of the positively charged oil particles contained in the first gas and the negatively charged oil particles contained in the second gas is contacted / coupled. It is thought to increase. Therefore, with this configuration, the increase in the diameter of the oil particles is further promoted, and the amount of deposit generated due to blow-by gas can be further reduced.

  The above-mentioned “convex portion” only needs to exhibit the effect of disturbing the flow of blow-by gas, and the size, shape, number, arrangement, and the like are not particularly limited. For example, the convex portions are appropriately sized, shaped, numbered and arranged in consideration of the effective cross-sectional area of the flow path of the blow-by gas, the shape of the flow path, the flow velocity of the blow-by gas, and the like based on experiments conducted in advance. Can be provided. Further, for example, the protrusion may be a plurality of protrusions (for example, a plurality of dot-like protrusions) provided independently on a member that defines a flow path for blow-by gas. A group of protrusions (for example, annular or spiral protrusions provided so as to surround the flow path of blow-by gas) may be provided.

・ Aspect 6
In the blow-by gas processing apparatus of the present invention, the number of positive charging processes and negative charging processes performed by the oil charging unit is not particularly limited. That is, the oil charging unit may be configured to perform the positive charging process and the negative charging process only once, or may be configured to perform the positive charging process and the negative charging process a plurality of times. In other words, the blow-by gas processing apparatus of the present invention may include a single oil charging unit or a plurality of oil charging units.

For example, the blow-by gas processing apparatus of the present invention is
The gas introducing means divides the flow of the blow-by gas in which the first gas and the second gas are mixed into two flows again, and the positive charging process is again performed on the blow-by gas belonging to one flow. In addition, after the negative charging process is performed again on the blow-by gas belonging to the other flow, the first gas and the second gas are mixed by repeating the joining of the two flows. obtain.

  With the above configuration, charging of the oil particles by the oil charging unit and contact / bonding of the charged oil particles (enlargement of the diameter of the oil particles) are repeated. As a result, the amount of oil particles having a small size (not having a large diameter) can be reduced as much as possible as compared with the case where the oil particles are charged and enlarged only once. In other words, the oil particle size distribution in the intake passage is made closer to the “distribution with relatively large oil particles” (distribution to reduce the amount of deposit generated). Can do. Therefore, with this configuration, the increase in the diameter of the oil particles is further promoted, and the amount of deposit generated due to blow-by gas can be further reduced.

  By the way, the number of times that the charging and diameter increase of the oil particles are repeated is not particularly limited, and the performance required for the blow-by gas processing device and the number of times that can be realized when the blow-by gas processing device is actually applied to a vehicle. It may be determined in consideration of the above.

・ Aspect 7
As described above, the first gas and the second gas can be mixed before being introduced into the intake passage. However, the first gas and the second gas are not necessarily mixed before being introduced into the intake passage, and may be mixed after being introduced into the intake passage (that is, in the intake passage).

For example, in the blow-by gas processing apparatus of the present invention,
The gas introduction unit may be configured to individually introduce the first gas and the second gas into the intake passage.

  The above is an example of a specific configuration for introducing both the first gas and the second gas into the intake passage.

・ Aspect 8
By the way, the blow-by gas processing apparatus of the present invention may be configured to charge the oil particles by the oil charging means only when a large amount of deposit is predicted to be generated. More specifically, for example, the higher the temperature of the gas in the intake passage, the easier it is for the oil component to evaporate from the oil particles.

Therefore, for example, in the blow-by gas processing apparatus of the present invention,
The oil charging means performs the positive charging process and the negative charging process when the temperature in the intake passage is higher than a predetermined threshold temperature, and when the temperature in the intake passage is equal to or lower than the threshold temperature. The positive charging process and the negative charging process may not be performed.

  With the above configuration, the blow-by gas processing apparatus introduces the blow-by gas into the intake passage as it is when the temperature in the intake passage (for example, when the internal combustion engine includes a supercharger, the outlet temperature of the compressor) is a predetermined value or less. When the temperature in the intake passage is higher than a predetermined value, both the positively charged gas (first gas) and the negatively charged gas (second gas) are introduced into the intake passage. . With this configuration, the energy used by the oil charging means can be reduced as much as possible. And when a blowby gas processing apparatus is applied to an internal combustion engine, the fuel consumption of an internal combustion engine can be improved.

  As described above together with some aspects, the blow-by gas processing apparatus of the present invention has an effect that the amount of deposit generated due to blow-by gas can be reduced as much as possible.

1 is a schematic view of an internal combustion engine to which a blow-by gas processing apparatus according to a first embodiment of the present invention is applied. It is a graph showing an example of distribution of the size of oil particles contained in blowby gas. It is the schematic of the internal combustion engine to which the blowby gas processing apparatus which concerns on 2nd Embodiment of this invention was applied. It is the schematic of the internal combustion engine to which the blowby gas processing apparatus which concerns on 3rd Embodiment of this invention was applied. It is the schematic of the internal combustion engine to which the blowby gas processing apparatus which concerns on 4th Embodiment of this invention was applied. It is the schematic of the internal combustion engine to which the blowby gas processing apparatus concerning 5th Embodiment of this invention was applied. It is the schematic of the internal combustion engine to which the blowby gas processing apparatus concerning 6th Embodiment of this invention was applied. It is a conceptual diagram showing the mode of a change of an oil particle and particulate matter.

  Hereinafter, blow-by gas processing apparatuses according to embodiments of the present invention will be described with reference to the drawings. The blow-by gas processing apparatus of each embodiment is applied to an internal combustion engine (piston reciprocating type, in-line, multi-cylinder, diesel engine).

<First Embodiment>
FIG. 1 shows a schematic configuration of an internal combustion engine 10 to which a blow-by gas processing device (hereinafter also referred to as “first device”) according to a first embodiment of the present invention is applied. As shown in FIG. 1, the engine 10 includes an engine body 20, an intake passage 30, and an exhaust passage 40. A blow-by gas processing device 50 is applied to the engine 10.

  The engine body 20 includes a crankcase 21, an oil pan 22, a cylinder block 23 and a cylinder head 24.

  The crankcase 21 rotatably supports the crankshaft 21a. The oil pan 22 is fixed to the crankcase 21 below the crankcase 21. The crankcase 21 and the oil pan 22 form a space for storing the crankshaft 21a and oil (lubricating oil) OL (hereinafter also referred to as “crankcase chamber”).

  The cylinder block 23 is fixed to the crankcase 21 above the crankcase 21. The cylinder block 23 includes a plurality (four cylinders) of hollow cylindrical cylinders (cylinder bores) 23a.

  A piston 23b is stored in the cylinder 23a. The piston 23b has a substantially cylindrical shape and includes a plurality of piston rings on the side surface. The piston 23b is connected to the crankshaft 21a by a connecting rod 23c. A combustion chamber CC is defined by the upper surface (top surface) of the piston 23b, the inner wall of the cylinder 23a, and the lower surface of the cylinder head 24.

  The piston 23b repeatedly moves up and down in the cylinder 23a as the crankshaft 21a rotates. At this time, the oil (oil film) adhering to the inner wall of the cylinder 23 a is scraped off toward the crankcase 21 by the piston ring. The oil also falls toward the crankcase from the connecting portion between the piston 23b and the connecting rod 23c. When these oils collide with members such as the crankshaft 21a rotating at a high speed, various sizes of oil droplets (that is, oil particles) are generated. Furthermore, oil particles are also generated when the oil OL in the crankcase chamber evaporates. Thus, oil particles of various sizes are generated in the crankcase chamber of the engine 10.

  On the other hand, a slight gap is provided between the piston 23b (piston ring) and the inner wall of the cylinder 23a in order to move the piston 23b smoothly. Therefore, as indicated by the black arrow in FIG. 1, gas in the combustion chamber CC may leak into the crankcase chamber through this gap (for example, in the compression stroke and expansion stroke of the engine 10). The gas leaking into the crankcase chamber in this way is “blow-by gas”.

  Generally, soot or the like resulting from combustion of the air-fuel mixture in the combustion chamber is attached to the inner wall of the cylinder 23a, the piston ring, and the like. Therefore, when blow-by gas passes through the gap, the soot may be taken into the blow-by gas. Further, when the gas after combustion (exhaust gas) itself becomes blow-by gas, soot or the like resulting from combustion is included in the blow-by gas itself. Thus, the blow-by gas contains fine particles (particulate matter) such as soot.

  When the particulate matter contained in the blowby gas comes into contact with the oil particles in the crankcase chamber, the particulate matter is taken into the oil particles as described above with reference to FIG. As a result, the blow-by gas in the crankcase chamber generally contains a large amount of oil particles containing particulate matter. Such an aggregate of oil particles is also referred to as oil mist.

  The cylinder head 24 is fixed to the cylinder block 23 above the cylinder block 23. The cylinder head 24 is formed with an intake port connected to the combustion chamber CC and an exhaust port connected to the combustion chamber CC. The cylinder head 24 is provided with a fuel injection valve (not shown).

  The intake passage portion 30 includes an intake pipe 31, an intercooler 32, and a compressor 61 of a turbocharger 60. The intake pipe 31 is connected to the intake port of the cylinder head 24. Therefore, the intake pipe 31 and the intake port constitute an intake passage.

  The compressor 61 is provided on the intake pipe 31 and compresses the sucked air In. The intercooler 32 is provided at a position downstream of the compressor 61 in the intake pipe 31 and cools the sucked air.

  The exhaust passage 40 includes an exhaust pipe 41 and a turbine 62 of the turbocharger 60. The exhaust pipe 41 is connected to the exhaust port of the cylinder head 24. Therefore, the exhaust pipe 41 and the exhaust port constitute an exhaust passage.

  The turbine 62 is provided on the exhaust pipe 41 and is rotated by the exhaust gas Ex. As a result, the compressor 61 connected to the turbine 62 rotates, and the air sucked into the turbocharger 60 is compressed (supercharged).

  The blow-by gas processing device 50 has a series of blow-by gas passages defined by a first gas passage portion 51, a second gas passage portion 52, a gas discharge passage portion 53, and a gas introduction passage portion 54. doing. Further, the blow-by gas processing device 50 has an oil charging device 55.

  The blow-by gas flow path allows the blow-by gas in the crankcase chamber to be discharged to the outside of the crankcase through the gas discharge passage portion 53 and then to the gas introduction passage portion 54 via the first gas passage portion 51 and the second gas passage portion 52. It is guided and introduced into the intake passage (intake pipe 31). Here, at least a part of the oil particles contained in the blow-by gas passing through the first gas passage portion 51 is positively charged by the oil charging device 55 and contained in the blow-by gas passing through the second gas passage portion 52. At least a part of these is negatively charged by the oil charging device 55.

  More specifically, the gas discharge passage portion 53 passes through the inside of the cylinder block 23 and the cylinder head 24, and is connected to the crankcase chamber and to the connection portion between the first gas passage portion 51 and the second gas passage portion 52 ( A gas passage (pipe) for connecting the collecting portion P). As a result, as indicated by the black arrows in FIG. 1, the blow-by gas in the crankcase chamber passes through the gas discharge passage portion 53 and enters the outside of the crankcase (the first gas passage portion 51 and the second gas passage portion 52. Released to the gathering part P).

  The first gas passage portion 51 and the second gas passage portion 52 are gas passages (pipes) connected to the end portion (aggregation portion P) of the gas discharge passage portion 53. In other words, in the gathering portion P, the blow-by gas flow path is divided (branched) into two flow paths defined by the first gas passage portion 51 and the second gas passage portion 52. And the 1st gas passage part 51 and the 2nd gas passage part 52 are positions (aggregation part Q) downstream from the part (needle-like electrodes 55a and 55b) where the electrification processing by oil charging device 55 mentioned below is performed. ) Is connected to the gas introduction passage 54. In other words, in the gathering portion Q, the two divided blowby gas flow paths are merged again.

  The gas introduction passage portion 54 has one end connected to the first gas passage portion 51 and the second gas passage portion 52 (aggregation portion Q), and the other end opened to the intake passage (intake pipe 31) ( Pipe). In other words, the first gas passage portion 51 and the second gas passage portion 52 are located between the portions 55a and 55b where the charging process is performed by the oil charging device 55 and the intake passage (that is, the gathering portion Q). Connected at.

  The oil charging device 55 is a charge applying device configured to charge oil particles using corona discharge generated around an electrode provided in a flow path of blow-by gas (described in Patent Document 2). (Refer to the device that applies the negative charge of.) The oil charging device 55 protrudes into the blow-by gas flow path defined by the positive needle electrode 55a that protrudes into the blow-by gas flow path defined by the first gas passage 51 and the second gas flow path 52. A negative needle electrode 55b and a high voltage generator 55c for applying a high voltage for performing a charging process (positive charging process / negative charging process) to the needle electrodes 55a and 55b are provided. The high voltage generator 55c and the needle electrodes 55a and 55b are connected by a path through which power can be transmitted, and the needle electrode 55a, A high voltage is applied to 55b.

  When the oil charging device 55 is in operation, at least a part of the oil particles contained in the blow-by gas passing through the first gas passage 51 is positive ions (blow-by caused by corona discharge generated around the needle-like electrode 55a. It is charged positively (positively charged process), for example, by bonding of charged particles in which gas components constituting the gas are positively ionized. On the other hand, when the oil charging device 55 is operating, at least a part of the oil particles contained in the blow-by gas passing through the second gas passage 52 is negative ions caused by corona discharge generated around the needle-like electrode 55b. It is negatively charged (negatively charged treatment) due to bonding of (charged particles or electrons themselves in which the gas components constituting the blowby gas are ionized negatively).

  The positively charged oil particles pass along the flow of blow-by gas through the first gas passage portion 51 and are carried toward the collecting portion Q. Similarly, the negatively charged oil particles pass along the flow of blow-by gas through the second gas passage portion 52 and are carried toward the collecting portion Q.

  That is, the first gas passage 51 passes the blow-by gas (first gas) that has been subjected to the positive charging process, as indicated by an arrow with a plus sign in FIG. On the other hand, the second gas passage 52 passes the blow-by gas (second gas) that has been subjected to the negative charging process, as indicated by an arrow with a minus sign in FIG.

  When the blow-by gas (first gas) subjected to the positive charging process and the blow-by gas (second gas) subjected to the negative charging process merge in the gathering portion Q, the positively charged oil particles are negatively The charged oil particles are brought into contact with each other and combined into one oil particle. As a result, the oil particles are enlarged.

  Thereafter, as shown by the hatched arrows in FIG. 1, a gas in which blow-by gas (first gas) subjected to positive charging and blow-by gas (second gas) subjected to negative charging is mixed is a gas. It is discharged to the intake pipe 31 through the introduction passage portion 54.

  As described above, in the first device, the flow of the blow-by gas discharged from the crankcase chamber is divided into two flows, the blow-by gas belonging to one flow is subjected to the positive charging process and belongs to the other flow. After the blow-by gas is negatively charged, the two flows are merged. That is, the blow-by gas (first gas) subjected to the positive charging process and the blow-by gas (second gas) subjected to the negative charging process are mixed before being introduced into the intake passage, and the mixed blow-by gas is mixed. Gas is introduced into the intake passage (intake pipe 31).

  Note that the above-described movement of blow-by gas (gas movement from the crankcase chamber to the intake pipe 31 via the passage portions 53, 51, 52, and 54) is related to the pressure of the blow-by gas in the crankcase chamber and the intake passage (intake pipe 31). This occurs due to the difference between the pressure of the gas in the parenthesis.

  When mixing the first gas and the second gas, the amounts of the first gas and the second gas are, for example, the efficiency with which the oil particles are positively charged by the positive charging process and the oil particles being negative by the negative charging process. It can be determined based on the efficiency of charging. This charging efficiency can be determined based on, for example, the proportion of oil particles that are positively charged among the oil particles contained in the blowby gas, the amount of charge, and the like. For example, if the positively charged efficiency and the negatively charged efficiency are substantially the same, the amounts of the first gas and the second gas are determined to be substantially the same. Specifically, the effective cross-sectional areas of the first gas passage portion 51 and the second gas passage portion 52 are determined so that the amounts of the first gas and the second gas are substantially the same.

  According to the first apparatus configured as described above, after the positively charged blowby gas (first gas) and the negatively charged blowby gas (second gas) are appropriately mixed, It is introduced into the intake passage (intake pipe 31).

  Therefore, as described above, when the oil particles are enlarged, the blow-by gas introduced into the intake passage (intake pipe 31) is larger in size than the blow-by gas discharged from the crankcase chamber. The distribution is close to the distribution for reducing the amount of deposit generated. Therefore, the 1st apparatus can reduce the production amount of the deposit resulting from blow-by gas as much as possible.

  By the way, in addition to the configuration described above, the first device may include an oil separator that separates at least a part of the oil particles contained in the blowby gas from the blowby gas. For example, as shown in FIG. 2, the first device may be configured to have an oil separator 56 in the middle of the gas discharge passage portion 53.

  When the first device has the above-described configuration, the gas discharge passage portion 53 passes through the inside of the cylinder block 23 and the cylinder head 24, and through the oil separator 56, the crankcase chamber, the first gas passage portion 51, and the first gas passage portion 51. The connection part (aggregation part) P with the 2 gas passage part 52 will be connected.

  In the above configuration, as the oil separator 56, for example, a separation device configured to separate oil particles using centrifugal force due to the swirling flow of blow-by gas generated in the separation container may be employed (for example, And Japanese Patent Application Laid-Open No. 2008-38713). The separated oil particles are aggregated by colliding and adhering to the wall surface in the separation container and returned to the crankcase chamber through the oil recovery pipe 56a. As a result, the amount of oil released to the intake passage together with the blow-by gas (the amount of oil consumed) is reduced by the amount of recovered oil particles.

  As described above, the first device can also be configured to perform processing (oil separation processing) by the oil separator 56 on the blow-by gas before the charging processing by the oil charging device 55 is performed. According to this configuration, in addition to minimizing the amount of deposit generated due to blow-by gas, the amount of oil consumed can be reduced.

  Hereinafter, for convenience, also in the blow-by gas processing apparatus (second to sixth embodiments) according to other embodiments of the present invention, the blow-by gas processing apparatus 50 includes an oil separator 56. Therefore, hereinafter, the first device having the oil separator 56 is also simply referred to as “first device”. However, as can be understood from the above description, the blow-by gas processing apparatus according to the embodiment of the present invention does not necessarily have the oil separator 56, and the oil separator 56 depends on the degree of demand for reducing the oil consumption. The presence or absence of this should just be selected suitably.

Second Embodiment
FIG. 3 shows a schematic configuration of an internal combustion engine 10 to which a blow-by gas processing apparatus (hereinafter also referred to as “second apparatus”) according to a second embodiment of the present invention is applied. The second device has the same configuration as that of the first device except for “a method for connecting the first gas passage portion 51 and the second gas passage portion 52 in the gathering portion Q”. Therefore, the second device will be described below centering on this difference.

  In the second device, the blow-by gas processing device 50 includes a first gas passage portion 51, a second gas passage portion 52, a gas discharge passage portion 53, and a gas introduction passage portion 54. have. However, the first gas passage portion 51 and the second gas passage portion 52 are connected so that the flow of blow-by gas is confronted with each other in the gathering portion Q.

  More specifically, the first gas passage 51 and the second gas passage 52 have a flow direction of a positively charged blowby gas (an arrow with a plus sign in the figure) and a negatively charged blowby. The gas (arrow with a minus sign in the figure) is arranged coaxially in the vicinity of the gathering portion Q so that the flow direction is opposite (so that the flows collide from the front).

  According to the second device configured as described above, positively charged oil particles and negatively charged oil particles are mixed by a complicated mixture of positively charged blowby gas and negatively charged blowby gas. It is thought that the frequency of contact with and bonding with will increase. Therefore, the second device can further promote the enlargement of the oil particles and further reduce the amount of deposit generated due to the blow-by gas.

<Third Embodiment>
FIG. 4 shows a schematic configuration of a blow-by gas processing apparatus (hereinafter also referred to as “third apparatus”) according to a third embodiment of the present invention. The third device has the same configuration as that of the first device, except that “the effective cross-sectional areas of the first gas passage portion 51 and the second gas passage portion 52 become smaller as approaching the gathering portion Q”. Therefore, hereinafter, the third device will be described focusing on this difference.

  In the third device, the blow-by gas processing device 50 includes a first gas passage portion 51, a second gas passage portion 52, a gas discharge passage portion 53, and a gas introduction passage portion 54. have. However, the first gas passage portion 51 and the second gas passage portion 52 have both the effective sectional area of the first gas passage portion 51 and the effective sectional area of the second gas passage portion 52 in the vicinity of the collecting portion Q. It is comprised so that it may become small as it approaches Q.

  According to the third apparatus configured as described above, the flow rate of the blow-by gas (first gas) subjected to the positive charging process and the blow-by gas (second gas) subjected to the negative charging process increases as the position is closer to the collecting portion Q. . Then, it is considered that the frequency with which the positively charged oil particles and the negatively charged oil particles come into contact with and combine with each other due to the complicated mixing of these blow-by gases. Therefore, the third device can further promote the enlargement of the oil particles and further reduce the amount of deposit generated due to the blow-by gas.

  By the way, in the 3rd device, the effective cross-sectional area of both the 1st gas passage part 51 and the 2nd gas passage part 52 becomes small as it approaches gathering part Q. However, the third device may be configured such that the effective sectional area of one of the first gas passage portion 51 and the second gas passage portion 52 becomes smaller as it approaches the gathering portion Q.

<Fourth embodiment>
FIG. 5 shows a schematic configuration of a blow-by gas processing apparatus (hereinafter also referred to as “fourth apparatus”) according to a fourth embodiment of the present invention. The fourth device has the same configuration as that of the first device except that there is a convex portion protruding from the passage portion into the blow-by gas flow path in the vicinity of the collecting portion Q. Therefore, the fourth device will be described below centering on this difference.

  In the fourth device, the blow-by gas processing device 50 includes a first gas passage portion 51, a second gas passage portion 52, a gas discharge passage portion 53, and a gas introduction passage portion 54. have. However, the first gas passage portion 51, the second gas passage portion 52, and the gas introduction passage portion 54 protrude in the vicinity of the gathering portion Q from the members defining the passage portions into the blow-by gas flow path. And a plurality of convex portions 57. These convex portions 57 are a plurality of dot-shaped convex portions that are independent of each other.

  According to the fourth apparatus configured as described above, in the vicinity of the gathering portion Q, the positively charged blowby gas (first gas), the negatively charged blowby gas (second gas), and the mixture thereof are mixed. The flow of blowby gas is disturbed. Then, it is considered that the frequency with which the positively charged oil particles and the negatively charged oil particles come into contact with and combine with each other due to the complicated mixing of these blow-by gases. Therefore, the fourth device can further promote the enlargement of the oil particles, and can further reduce the amount of deposit generated due to the blow-by gas.

  By the way, the 4th apparatus has the convex part 57 in all of the 1st gas passage part 51, the 2nd gas passage part 52, and the gas introduction passage part 54 in the vicinity of the gathering part Q. However, the third device may be configured such that the convex portion 57 exists in at least one of the first gas passage portion 51, the second gas passage portion 52, and the gas introduction passage portion 54 in the vicinity of the collecting portion Q. Good.

<Fifth Embodiment>
FIG. 6 shows a schematic configuration of a blow-by gas processing apparatus (hereinafter also referred to as “fifth apparatus”) according to a fifth embodiment of the present invention. The fifth device has the same configuration as the first device, except that “the charging process for the blow-by gas is performed a plurality of times”. Therefore, hereinafter, the fifth device will be described focusing on this difference.

  In the fifth device, the blow-by gas processing device 50 includes a first gas passage portion 51, a second gas passage portion 52, a gas discharge passage portion 53, and a gas introduction passage portion 54. have. However, the first gas passage portion 51 and the second gas passage portion 52 that are divided at the collecting portion P1 and connected at the collecting portion Q1 are divided again at the collecting portion P2, and are connected again at the collecting portion Q2. It has become so.

  According to the fourth device configured as described above, charging of the oil particles and contact / bonding with the oil particles (enlargement of the diameter of the oil particles) are repeated in the gathering portions Q1 and Q2. As a result, the amount of oil particles having a small size can be reduced as much as possible as compared with the case where charging and increasing the diameter of the oil particles are performed only once. Therefore, the fifth device can further promote the increase in the diameter of the oil particles and further reduce the amount of deposit generated due to the blow-by gas.

<Sixth Embodiment>
FIG. 7 shows a schematic configuration of an internal combustion engine 10 to which a blow-by gas processing apparatus (hereinafter also referred to as “sixth apparatus”) according to a sixth embodiment of the present invention is applied. The sixth device has the same configuration as that of the first device except for “a method of connecting the first gas passage portion 51 and the second gas passage portion 52 and the intake passage”. Therefore, the sixth device will be described below centering on this difference.

  In the sixth device, the blow-by gas processing device 50 has a blow-by gas flow path including a first gas passage portion 51, a second gas passage portion 52, and a gas discharge passage portion 53. That is, the blow-by gas flow path of the sixth device does not have the gas introduction passage portion 54 in the first device.

  More specifically, the first gas passage portion 51 and the second gas passage portion 52 are directly connected to the intake passage (intake pipe 31) without branching again after branching at the gathering portion P. Accordingly, each of the positively charged blowby gas (first gas) and the negatively charged blowby gas (second gas) is individually introduced into the intake passage (intake pipe 31). In the sixth device, the positively charged blowby gas (first gas) and the negatively charged blowby gas (second gas) are mixed in the intake passage.

  As with the first device, the sixth device configured in this way achieves both reducing the amount of oil consumed due to blow-by gas and reducing the amount of deposit generated due to blow-by gas. can do.

<Summary of Embodiment>
As described with reference to FIGS. 1 to 7, the blow-by gas processing apparatus of the above-described embodiment is
Gas introduction means (a series of passage portions 51, 52, 53, 54) for introducing blow-by gas containing oil particles OP, which are fine particles derived from the lubricating oil OL of the internal combustion engine 10, into the intake passage 31 of the internal combustion engine;
A positive charging process for positively charging at least a part of the oil particles OP contained in the blowby gas and a negative charging process for negatively charging at least a part of the oil particles OP contained in the blowby gas are performed. Oil charging means 55;
It has.

  The gas introduction means 51 to 54 are the first gas (the gas passing through the passage portion 51) that is the blow-by gas that has been subjected to the positive charging process, and the blow-by gas that has been subjected to the negative charging process. Both of the second gas (the gas passing through the passage portion 52) are introduced into the intake passage.

Specifically, in the first device to the fifth device,
The gas introducing means 51 to 54 mix the first gas and the second gas before the first gas and the second gas are introduced into the intake passage, and the mixed first gas and The second gas is introduced into the intake passage (the passage portions 51 and 52 are connected to the passage portion 54 in the collecting portion Q).

  More specifically, the gas introducing means 51 to 54 divides the flow of blow-by gas into two flows (the passage portions 51 and 52 are connected to the passage portion 53 at the collecting portion Q at the collecting portion P), The blow-by gas belonging to one flow is subjected to the positive charging process (the positive needle electrode 55a is provided in the passage 51) and the blow-by gas belonging to the other flow is subjected to the negative charging process (passage) The negative needle-like electrode 55b is installed in the portion 52), and the two flows are merged (the passage portions 51 and 52 merge at the gathering portion Q), thereby mixing the first gas and the second gas. It is configured as follows.

Furthermore, in the second device:
The gas introduction means 51 to 54 merge the flow of the first gas and the flow of the second gas so as to face each other (the passage portions 51 and 52 are arranged coaxially), thereby the first gas and the gas It is comprised so that 2nd gas may be mixed.

Furthermore, in the third device:
In the vicinity of the position (aggregation part Q) where the first gas and the second gas are mixed, the effective cross-sectional area of the flow path (passage part 51) of the first gas and the flow path (passage of the second gas) At least one of the effective sectional areas of the part 52) (both in the third device) is configured to become smaller as approaching the mixing position.

Furthermore, in the fourth device:
In the vicinity of the position where the first gas and the second gas are mixed (aggregation part Q), it protrudes from the member (passage part 51) that defines the flow path of the first gas into the flow path. The convex portion 57 projecting from the member (passage portion 52) defining the flow path of the second gas into the flow path, and the mixed first gas and second gas. There is at least one (all in the fourth device) of a convex portion 57 that protrudes from a member (passage portion 54) that defines the flow path into the flow path.

Furthermore, in the fifth device:
The gas introduction means 51 to 54 again divide the flow of the blow-by gas in which the first gas and the second gas are mixed into two flows (aggregation part P2), and convert the blow-by gas belonging to one flow into the blow-by gas After the positive charging process is performed again and the negative charging process is performed again on the blow-by gas belonging to the other flow, the first gas is repeated by repeating the joining of the two flows (aggregation part Q2). And the second gas are mixed.

Furthermore, in the sixth device:
The gas introduction means 51 to 53 are configured to individually introduce the first gas and the second gas into the intake passage 31 (the passage portions 51 and 52 are directly connected to the intake pipe 31). .

<Other aspects>
The present invention is not limited to the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, in the concept of the blow-by gas processing apparatus applied to “one embodiment” of the plurality of embodiments (first embodiment to sixth embodiment), “others” of the plurality of embodiments is used. The concept of the blow-by gas processing device in “one or more of the embodiments” may be applied. In other words, one embodiment of the plurality of embodiments may be combined with one or more other embodiments.

  Further, the first to sixth devices are configured to perform a positive charging process and a negative charging process in response to an instruction to operate the oil charging device 55. For example, the blow-by gas processing apparatus of the present invention performs positive charging processing and negative charging processing when the temperature in the intake passage is higher than a predetermined threshold temperature, and when the temperature in the intake passage is equal to or lower than the threshold temperature. It may be configured not to perform the positive charging process and the negative charging process. This is because the higher the temperature of the gas in the intake passage, the easier it is for the oil component to evaporate from the oil particles, so the amount of deposit generated is considered to increase.

  Further, for example, the first device to the sixth device are applied to an internal combustion engine provided with a supercharger. This is because when air containing blow-by gas is compressed suddenly inside the compressor, the temperature of the oil particles in the blow-by gas suddenly rises and the viscosity of the oil particles increases greatly, and the surface of the diffuser etc. of the turbocharger This is because a deposit is easily generated. However, even if the blow-by gas processing apparatus of the present invention is applied to an internal combustion engine that does not include a supercharger, the above-described effects can naturally be exhibited.

  Furthermore, the first device to the third device are applied to a diesel engine. However, the blow-by gas processing apparatus of the present invention can also be applied to other types of engines (such as spark ignition internal combustion engines).

  INDUSTRIAL APPLICABILITY The present invention can be used as a blow-by gas processing apparatus that can reduce the amount of deposit generated due to blow-by gas as much as possible.

DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 50 ... Blow-by gas processing apparatus, 51 ... 1st gas passage part, 52 ... 2nd gas passage part, 55 ... Oil charging device, 56 ... Oil separator, P, Q ... Collection part

Claims (9)

Gas introduction means for introducing blow-by gas containing oil particles, which are fine particles derived from lubricating oil of the internal combustion engine, into the intake passage of the internal combustion engine;
Oil charging that performs a positive charging process for positively charging at least some of the oil particles contained in the blowby gas and a negative charging process for negatively charging at least some of the oil particles contained in the blowby gas. Means,
With
The gas introduction means introduces both the first gas that is the blow-by gas that has been subjected to the positive charging process and the second gas that is the blow-by gas that has been subjected to the negative charging process into the intake passage. The blow-by gas processing apparatus comprised in. The blow-by gas processing apparatus according to claim 1,
The gas introduction means mixes the first gas and the second gas before the first gas and the second gas are introduced into the intake passage, and the mixed first gas and second gas are mixed. A blow-by gas processing device configured to introduce gas into the intake passage. The blow-by gas processing apparatus according to claim 2,
The gas introducing means divides the flow of the blow-by gas into two flows, the blow-by gas belonging to one flow is subjected to the positive charging process, and the blow-by gas belonging to the other flow is subjected to the negative charging process. Then, the blow-by gas processing apparatus is configured to mix the first gas and the second gas by joining the two flows. In the blowby gas processing apparatus according to claim 2 or 3,
The blow-by means configured to mix the first gas and the second gas by causing the gas introduction means to merge the flow of the first gas and the flow of the second gas so as to face each other. Gas processing device. In the blowby gas processing device according to any one of claims 2 to 4,
In the vicinity of the position where the first gas and the second gas are mixed, at least one of the effective cross-sectional area of the flow path of the first gas and the effective cross-sectional area of the flow path of the second gas is mixed. A blow-by gas processing device that becomes smaller as it approaches the position. In the blowby gas processing device according to any one of claims 2 to 5,
In the vicinity of the position where the first gas and the second gas are mixed, a protrusion projecting from the member defining the flow path of the first gas into the flow path, the flow of the second gas A protrusion projecting into the flow path from the member defining the path, and projecting into the flow path from the member defining the flow path of the mixed first gas and the second gas A blow-by gas processing apparatus in which at least one of the convex portions is present. It is a blow-by gas processing apparatus as described in any one of Claims 2-6,
The gas introducing means divides the flow of the blow-by gas in which the first gas and the second gas are mixed into two flows again, and the positive charging process is again performed on the blow-by gas belonging to one flow. In addition, after the negative charging process is performed again on the blow-by gas belonging to the other flow, the first gas and the second gas are mixed by repeating the joining of the two flows. Blow-by gas processing equipment. The blow-by gas processing apparatus according to claim 1,
The blow-by gas processing apparatus, wherein the gas introduction means is configured to individually introduce the first gas and the second gas into the intake passage. In the blowby gas processing apparatus according to any one of claims 1 to 8,
When the oil charging means performs the positive charging process and the negative charging process when the temperature in the intake passage is higher than a predetermined threshold temperature, and the temperature in the intake passage is equal to or lower than the threshold temperature A blow-by gas processing apparatus configured not to perform the positive charging process and the negative charging process.

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