JP2005069058A - Intake system device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase intake charging quantity by preventing intake air interference due to communication of adjoining intake air passages via a brunch passage part while materializing port EGR of high distributivity by an exhaust gas recirculation passage having a common passage part and the brunch passage part in an intake system for an engine having an intake air control valve arranged in an intake port side of an intake air passage. <P>SOLUTION: The intake system for the engine has an EGR plate member 6 provided with an exhaust gas recirculation passage including the common passage part and the brunch passage part inside provided between a cylinder head and an intake manifold 4, and a butterfly valve type intake air control valve 61 switching intake passage area to large and small .in connection with open and close motion is arranged at an opening part 16 of each intake brunch passage 60 of the intake manifold 4. The intake air control valve 61 is provided with a valve piece 63 opening an opening part 50 of the brunch passage part at a close attitude and blocking the opening part 50 at an open attitude. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an engine intake system, and in particular, an intake control valve is disposed near an intake port of an intake passage of each cylinder of a multi-cylinder engine, and exhaust gas is introduced immediately downstream of the intake control valve of the intake passage of each cylinder. The present invention relates to an engine intake device.

  In a multi-cylinder engine for automobiles or the like, an intake control valve that switches the intake passage area to the size associated with the opening / closing operation is arranged near the intake port of the intake passage of each cylinder, and the intake control valve is closed in a predetermined operation region. It is conventionally known that the exhaust gas is recirculated upstream or downstream of the intake control valve (see, for example, Patent Document 1).

In addition, an EGR (exhaust gas recirculation) plate member is interposed between the intake port flange portion of the cylinder head and the intake manifold. With this plate member and the intake port flange portion, A tournament-type exhaust gas recirculation passage (EGR passage) including a common passage portion, an upstream branch passage portion, and a downstream branch passage portion is also conventionally known (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 7-247917 JP 2002-339809 A

  By the way, an intake control valve that switches the intake passage area between large and small in accordance with the opening / closing operation is arranged near the intake port of the intake passage of each cylinder of the multi-cylinder engine, and the intake air is controlled by controlling the closed posture in the low speed region of the engine. For example, a tournament-type exhaust gas recirculation passage branch passage is opened in the intake passage so that the exhaust gas is recirculated to the downstream side of the intake control valve. Then, the intake passages of adjacent cylinders communicate with each other through the branch passage portion of the exhaust gas recirculation passage, so that intake air interference occurs between adjacent cylinders. The effect of increasing the intake charge amount due to the above is lost.

  Therefore, in an engine intake device in which an intake control valve is arranged near the intake port of the intake passage of each cylinder of a multi-cylinder engine, an exhaust gas recirculation passage having a common passage portion and a branch passage portion leads to the intake port of each cylinder. It is an object to achieve an increase in intake charge amount by preventing intake air interference due to communication between adjacent intake passages via a branch passage portion of the exhaust gas recirculation passage while realizing highly distributable exhaust gas recirculation. It is.

  According to the present invention, an intake control valve that switches an intake passage area to a large or small in accordance with an opening / closing operation is disposed near an intake port of an intake passage of each cylinder of a multi-cylinder engine, and the intake control valve is closed in a predetermined operation region. The exhaust gas recirculation passage is opened immediately downstream of the intake control valve in the intake passage of each cylinder, and the intake control valve is controlled to be in a closed posture. The intake control valve disposed in the intake passage of each cylinder is a butterfly valve, and each intake control valve is operated to open and close via a drive shaft extending in the cylinder row direction. The exhaust gas recirculation passage has a common passage portion and a branch passage portion that branches from the common passage portion and opens to the intake passage of each cylinder between the adjacent intake passages, and each of the intake control valves of the adjacent intake passages. At least in On the other hand, when the intake control valve is closed, the opening of the branch passage portion to the intake passage is opened, and when the intake control valve is opened, the valve piece is configured to shield the opening of the branch passage portion to the intake passage. An air intake device for an engine provided with the above is provided.

  In this intake device, in a predetermined operation region such as an engine low speed region, the intake control valve is controlled to be in a closed posture, the opening of the branch passage portion of the exhaust gas recirculation passage to the intake passage is opened, and the branch passage portion Exhaust gas is supplied from the opening portion directly downstream of the intake control valve of each cylinder, and exhaust gas recirculation with high distribution is performed. Then, in the engine high speed region or the like, the intake control valve is controlled to be in the open posture, and accordingly, the valve piece blocks the opening of the branch passage. For this reason, exhaust intake interference between adjacent cylinders via the branch passage portion is prevented, and the intake charge amount can be increased by effects such as intake pulsation and inertia.

  Here, the intake control valve is configured to flow the intake air toward one side of the intake passage in the closed posture, and the opening of the branch passage portion of the exhaust gas recirculation passage flows the intake air in the closed posture of the intake control valve. When the valve element is provided on the side surface of the intake passage near the side and substantially parallel to the drive shaft, the valve piece is formed in a plate shape parallel to the intake flow direction on one end side in the drive axis direction of each intake control valve. It is good to form. By doing so, it is possible to increase the diffusibility of the exhaust gas to the intake air in the closed state of the intake control valve, and to make almost no intake resistance due to the valve piece in the open state of the intake control valve.

  In addition, when the intake control valve is disposed near the cylinder connection end of the intake manifold, a plate member having an exhaust gas recirculation passage formed therein is disposed between the intake manifold and the cylinder head. Preferably, an intake opening communicating with the opening of each branch passage of the intake manifold is provided, and an opening of the branch passage of the exhaust gas recirculation passage is formed in the intake opening. By doing so, it is possible to set an exhaust gas recirculation system with a good distribution and to improve the assemblability without almost changing the current engine.

  The plate member is preferably composed of two divided plate bodies that are overlapped in the thickness direction, and the exhaust gas recirculation passage is constituted by a groove formed on the joint surface of each divided plate body. By doing so, the exhaust gas recirculation passage in the plate member can be easily manufactured, the degree of freedom of passage design is great, and an exhaust gas recirculation system with good distribution can be configured compactly.

  As described above, the intake system for an engine according to the present invention can perform exhaust gas recirculation with high distributiveness in the operation region where the intake control valve is controlled to be closed, and the intake control valve is controlled to be in the open position. In the operation region, the opening of the branch passage portion is blocked by the valve piece, thereby preventing exhaust intake-air interference between adjacent cylinders via the branch passage portion, so that effects such as intake pulsation and inertia are not impaired. it can

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 is a front view of the upper part of the engine, FIG. 2 is an assembly view of the intake manifold and the EGR plate member as seen from the cylinder head side of the upper part of the engine, FIG. 3 is a front view of the EGR plate member, and FIG. FIG. 5 is a front view of the EGR plate inner constituting the EGR plate member of FIG. 3, and FIG. 6 is a front view of the EGR plate outer constituting the EGR plate member of FIG. 7 is a front view of the gasket between the plates of the EGR plate member of FIG. 3, FIG. 8 is a front view of the gasket between the EGR plate member and the intake port flange portion of the cylinder head, and FIG. 9 is the intake control valve closing of FIG. FIG. 10 is a DD cross-sectional view of the intake control valve opened state of FIG. 1.

  The engine according to this embodiment is a crossflow type in-line four-cylinder engine mounted horizontally in an engine room of an automobile. As shown in FIG. 1, intake ports 2a and 2b of each cylinder are provided in front of a cylinder head 1. , 2c, 2d have an intake port flange portion 3 that is open, and an intake manifold 4 is connected to the intake port flange portion 3. The cylinder head 1 is made of aluminum, and the intake manifold 4 is made of resin.

  The intake manifold 4 has an EGR plate member 6 superimposed on the flange portion 5 as shown in FIG. 2, and is bolted to the intake port flange portion 3 of the cylinder head 1 with the EGR plate member 6 interposed therebetween.

  As shown in FIGS. 3 and 4, the EGR plate member 6 includes two aluminum divided plate bodies, an EGR plate inner 7 and an EGR plate outer 8, which are stacked in the thickness direction with a metal gasket 9 interposed therebetween. It is fastened and fixed integrally with (plate fastening screw), is substantially rectangular in front view, and has a width in the height direction that expands downward in three steps from left to right. The EGR plate inner 7 is disposed on the cylinder head 1 side, and the EGR plate outer 8 is disposed on the intake manifold 4 side.

  The EGR plate member 6 includes an intake opening 11 corresponding to each intake port 2a, 2b, 2c, 2d that opens to the intake port flange 3 of the cylinder head 1, a plate fastening screw hole 12 for integral fastening, An intake manifold fastening bolt insertion hole 13 for fastening a bolt to the cylinder head 1 by fastening together with the intake manifold 4 is provided, and the EGR plate member 6 is thickened on the right side and the lower side of the intake opening 11 at the right end when viewed from the front. Heat-insulating openings 14 and 15 penetrating in the direction are provided. Among them, the right heat insulating opening 14 is a through-hole having a substantially triangular cross section surrounding the lower right end of the EGR plate member 6, and the lower heat insulating opening 15 has a right width in the height direction of the intake opening 11. It is a slit-like through hole extending substantially horizontally so as to be separated from the downwardly extending portion of the largest portion.

  As shown in FIG. 2, the EGR plate member 6 is divided into an exhaust gas introduction part 21, a common passage part 22 communicating with the exhaust gas introduction part 21, and a left and right part from the common passage part 22. Each of the four-cylinder intake air includes a pair of upstream branch passages 23, 24 extending and a pair of downstream branch passages 25, 26, 27, 28 extending separately from the front end of each upstream branch passage 23, 24. A so-called tournament-style exhaust gas recirculation passage for distributing exhaust gas is provided in the vicinity of the ports 2a, 2b, 2c, and 2d.

  The exhaust gas introduction part 21 communicates with an exhaust gas supply part 20 (see FIG. 1) for EGR (exhaust gas recirculation) provided in the intake port flange part 3 of the cylinder head 1 to supply EGR gas (recirculation exhaust gas). It is for introducing into the EGR plate member 6 and is located at the lower left end (lower right end in front view) when viewed from the cylinder head 1 side as shown in FIG. Then, as shown in FIG. 2, the common passage portion 22 extends from the exhaust gas introduction portion 21 to the substantially lower center between the two inner intake openings 11 along the lower edge of the downward extending portion of the EGR plate member 6. A pair of upstream branch passage portions 23 and 24 are divided into two intake openings on the left and right outer sides and on the inner side. 11 extends substantially to the center between the two left and right outer and inner two intake openings 11, and the downstream branch passages 25, 26 and 27, 28 extend from the tip of each upstream branch passage 23, 24 to the left and right. Separately, it extends to each intake opening 11 linearly.

  As shown in FIGS. 5 and 6, the EGR plate inner 7 and the EGR plate outer 8 have the exhaust gas introduction portion 21, the common passage portion 22, the upstream branch passage portions 23 and 24, and the downstream branch at the joint surfaces. Grooves 29 and 30 each having a shape in which the passages 25, 26 and 27, 28 are substantially halved are formed. When the EGR plate inner 7 and the EGR plate outer 8 are overlapped, these grooves 29 and 30 are combined to form an exhaust gas introducing portion 21, a common passage portion 22, an upstream branch passage portions 23 and 24, and a downstream branch passage 25, An exhaust gas recirculation passage composed of 26, 27, and 28 is formed.

  The EGR plate inner 7 is provided with an opening 31 communicating with the exhaust gas supply unit 20 on the cylinder head 1 side at the center of the enlarged portion of the groove 29 constituting the exhaust gas introduction unit 21 of the groove 29. The EGR plate inner 7 and the EGR plate outer 8 are provided with an EGR plate so that the exhaust gas introduced from the exhaust gas supply part 20 on the cylinder head 1 side through the opening 31 flows to the common passage part 22 to have resistance. Baffle protrusions 32 and 33 are provided as barriers that overlap the inner side of the opening 31 when the inner 7 and the EGR plate outer 8 are overlapped. Exhaust gas supplied from the exhaust gas supply unit 20 of the cylinder head 1 suddenly expands due to entering the exhaust gas introduction unit 21 whose cross-sectional space has been rapidly expanded in a flat shape from the opening 31 of the EGR plate member 6, and baffle protrusions The heat is dissipated by the pressure loss due to 32 and 33, and the temperature decreases accordingly.

  As shown in FIGS. 5 and 6, the EGR plate inner 7 and the EGR plate outer 8 include openings 34 and 35 constituting the intake opening 11, holes 36 and 37 constituting the plate fastening screw hole 12, and an intake manifold fastening bolt. Holes 38 and 39 constituting the insertion hole 13 and openings 40 and 41 and 42 and 43 constituting the heat insulating openings 14 and 15 are formed.

  The metal gasket 9 disposed between the EGR plate inner 7 and the EGR plate outer 8 is as shown in FIG. 7 and includes openings 34 and 35 constituting the intake opening 11, an exhaust gas introduction part 21, and a common passage part. 22, an opening 9A is formed so as to surround the upstream branch passage portions 23 and 24 and the grooves 29 and 30 constituting the downstream branch passages 25, 26 and 27, 28, and a sealing bead is formed along the inner edge of the opening 9A. 44 is formed.

  The EGR plate member 6 is disposed between the intake port flange portion 3 of the cylinder head 1 and the intake manifold 4. As shown in FIG. 2, each intake opening portion is provided between the intake manifold flange 4 and the flange portion 5 of the intake manifold 4. 8, a rubber seal ring 45 (O-ring) is sandwiched between the cylinder 11 and a metal gasket 46 shown in FIG. Thus, the cylinder head 1 is bolted. As shown in FIG. 8, the metal gasket 46 on the cylinder head 1 side is formed with openings 46A and 46B surrounding the intake openings 11 and the exhaust gas introduction part 21, and the inner edges of these openings 46A and 46B. A sealing bead 47 is formed along the side.

  The seal ring 45 is disposed in the flange portion 5 of the intake manifold 4 so as to surround each branch passage opening 16 of the intake manifold 4 and the intake opening 11 of the EGR plate member 6 corresponding to the branch passage opening 16. It is press-contacted to the member 6.

  In the exhaust gas recirculation passage inside the EGR plate member 6, the tips of the downstream branch passages 25, 26, 27, and 28 open to the respective intake openings 11, and a restriction is provided at the opening 50 as shown in FIG. It has been.

  In this engine, the opening (branch passage opening) 16 of each intake branch passage 60 of the intake manifold 4 constituting the intake passage communicating with the intake ports 2a, 2b, 2c, 2d of each cylinder is shown in FIGS. As shown in FIG. 10, a butterfly valve type intake control valve 61 is arranged.

  Each intake control valve 61 is fixed to a common drive shaft 62 extending in the cylinder row direction at a position offset downward from the center of each branch passage opening 16, and is opened and closed by the rotation of the drive shaft 62. Therefore, in the closed position, the intake passage is blocked off with the upper portion left as shown in FIG. 9, and in the open position, the state is along the axial direction of the intake passage (intake branch passage 60) as shown in FIG. Fully open the intake passage.

  In a predetermined operation region on the low engine speed side, the intake control valve 61 is controlled to a closed posture. As a result, the intake air approaches the upper side of the intake passage (intake branch passage 60) of each cylinder and flows through a narrow passage cross-sectional area, increasing the flow velocity of the intake air and causing a swirl in the combustion chamber. On the other hand, in the operating region on the high speed side, the intake control valve 61 is controlled to the open posture.

  The opening 50 of each branch passage portion 25, 26, 27, 28 of the exhaust gas recirculation passage inside the EGR plate member 6 is directly downstream of the drive shaft of the intake control valve 61, and intake air in the closed posture of the intake control valve 61. It is provided on the side surface of the intake passage near the upper side near the air flow side so as to open substantially parallel to the drive shaft.

  The intake control valve 61 opens the opening 50 of the branch passage portions 25, 26, 27, and 28 as shown in FIG. 9 in the closed position, and opens the opening 50 in the open position as shown in FIG. A valve piece 63 is provided to shield the above. The valve piece 63 is formed on one end side in the drive shaft direction of each intake control valve 61 in a plate shape parallel to the intake flow direction.

  A notch recess 64 is formed on the side surface of the intake opening 11 of the plate member 6 so as to avoid interference with the valve piece 63 that opens and closes the opening 50 in accordance with the opening / closing operation of the intake control valve 61.

  With such a configuration, the intake control valve 61 is controlled to be closed in a predetermined operation region such as an engine low speed region, and the opening 50 to the intake passage of the branch passage portions 25, 26, 27, and 28 of the exhaust gas recirculation passage is formed. Opened, exhaust gas is supplied from the opening of the branch passage portion directly downstream of the intake control valve of each cylinder, and exhaust gas recirculation with high distribution is performed. Further, in the engine high speed region or the like, the intake control valve 61 is controlled to be in the open posture, and accordingly, the valve piece 63 blocks the opening portions of the branch passage portions 25, 26, 27, and 28. Therefore, it is possible to prevent exhaust air intake interference between adjacent cylinders via the branch passage portions 25, 26, 27, and 28, and to increase the intake charge amount by effects such as intake air pulsation and inertia.

  The above is an example of the embodiment. The present invention is not limited to this, and can be implemented in various other ways. For example, in the above embodiment, the present invention is applied to the intake manifold 4 provided with the intake control valve 61. However, the EGR plate member is formed thick, and the EGR plate member is provided with the intake control valve. Also good.

It is a front view of the engine upper part which concerns on embodiment. It is an assembly figure of the intake manifold and EGR plate member seen from the cylinder head side of the engine upper part concerning an embodiment. It is a front view of the EGR plate member concerning an embodiment. It is the perspective view which looked at the EGR plate member of FIG. 3 from front diagonally right upper direction. It is a front view of the EGR plate inner which comprises the EGR plate member of FIG. It is a front view of the EGR plate outer which comprises the EGR plate member of FIG. It is a front view of the gasket between the plates of the EGR plate member of FIG. It is a front view of the gasket between the EGR plate member which concerns on embodiment, and the intake port flange part of a cylinder head. FIG. 2 is a DD cross-sectional view of the intake control valve closed state of FIG. 1. FIG. 2 is a DD cross-sectional view of the intake control valve opened state of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder head 2a, 2b, 2c, 2d Intake port 3 Intake port flange part 4 Intake manifold 6 EGR plate member 7 EGR plate inner 8 EGR plate outer 9 Metal gasket 11 Intake opening part 16 Branch passage opening part 22 Common passage part 23, 24 Upstream branch passage portion 25, 26, 27, 28 Downstream branch passage 50 Opening portion 60 Intake branch passage 61 Intake control valve 62 Drive shaft 63 Valve piece 64 Notch recess

Claims (4)

An intake control valve that switches the intake passage area to the size of the intake passage of each cylinder of a multi-cylinder engine is arranged near the intake port, and the intake control valve is controlled to be closed in a predetermined operation region. In addition, an exhaust gas recirculation passage is opened immediately downstream of the intake control valve in the intake passage of each cylinder, and each of the exhaust gas recirculation passages from the exhaust gas recirculation passage in the predetermined operation region is controlled in a closed posture. An engine intake device for introducing exhaust gas into an intake passage of a cylinder,
The intake control valve disposed in the intake passage of each cylinder is a butterfly valve, and each intake control valve is opened and closed via a drive shaft extending in the cylinder row direction,
The exhaust gas recirculation passage has a common passage portion and a branch passage portion that opens from the common passage portion to the intake passage of each cylinder between adjacent intake passages.
At least one of the intake control valves of the adjacent intake passages opens an opening to the intake passage of the branch passage portion when the intake control valve is closed, and the branch passage when the intake control valve is open. An engine intake device, characterized in that a valve piece is provided to shield an opening to the intake passage of the part. The intake control valve is configured to flow intake air toward one side of the intake passage in a closed posture, and the opening of the branch passage portion of the exhaust gas recirculation passage flows intake air in the closed posture of the intake control valve Provided on the side surface of the intake passage near the one side substantially parallel to the drive shaft, and the valve piece is formed in a plate shape parallel to the intake flow direction on one end side of the drive shaft direction of each intake control valve The engine intake device according to claim 1, wherein the engine intake device is provided. The intake control valve is disposed near the cylinder connection end of the intake manifold, and the exhaust gas recirculation passage is formed inside a plate member disposed between the intake manifold and the cylinder head. The intake opening that communicates with the opening of each branch passage of the manifold is provided, and the opening of the branch passage of the exhaust gas recirculation passage is formed in the intake opening. The engine intake system described. The said plate member consists of two division | segmentation plate bodies which overlap in the thickness direction, The said exhaust gas recirculation | circulation passage is comprised by the groove | channel formed in the joint surface of each division | segmentation plate body. Engine intake system.

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