JP2019044709A - Intake control device - Google Patents

Abstract

To provide an intake control device which can supply a prescribed quantity of bypass intake air even if a capacity of a bypass flow passage is relatively small.SOLUTION: An intake control device 1 controls an intake amount of an internal combustion engine 2, and comprises a plurality of intake pipes 4 in which intake air introduced into the internal combustion engine 2 passes, valve bodies 5 arranged at intake pipes 4, respectively, and adjusting intake amounts of the intake pipes 4, and cross bypass passages 6 of the same number as that of the intake pipes 4. Each of the cross bypass passages 6 has an upstream-side opening part 7 which is opened at an inner wall face of one intake pipe 4 at an upstream side with respect to the valve body 5, and a downstream-side opening part 8 which is opened at an inner wall face of the other intake pipe 4 at a downstream side with respect to the valve body 5. The downstream-side opening part 8 exists one by one at each intake pipe 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intake control device that controls intake of an internal combustion engine.

  Conventionally, as an intake control device for controlling the intake of an internal combustion engine, an intake control device including a plurality of intake pipes through which intake air introduced into the internal combustion engine passes, and a body (throttle body) integrally including these intake pipes. Are known (see, for example, Patent Document 1).

  In the intake control device of Patent Document 1, a pair of adjacent intake pipes are connected by a block-like connecting portion. Each intake pipe is provided with a valve body for adjusting the intake amount via a valve shaft supported by the body.

  A space connected to the air cleaner and an air bypass mechanism for supplying idle air for idling operation from the space are provided at the connection portion of the pair of intake pipes. The air bypass mechanism has a control valve that controls the amount of intake air sucked from the space, and a bypass passage that supplies the air passing therethrough to the downstream side of the valve body of each intake pipe.

  Since this bypass passage is linear, a drill should be inserted from the communication passage provided on the upstream side of the pair of intake pipes at the connection portion, and drilling will be performed downstream of the valve body of each intake pipe. Can be easily provided.

JP 2014-47622 A

  However, in the case of application to a multi-cylinder internal combustion engine as in the intake control device of Patent Document 1, the timing of intake air differs for each cylinder. For this reason, when the intake process is started in the first cylinder and the intake flows through the corresponding first intake pipe, the flow of intake hardly occurs in the second intake pipe corresponding to the second cylinder. At this time, the decrease in air pressure accompanying the generation of the flow of intake air is small in the second intake pipe.

  Thus, in the state where the pressure difference is smaller between the upstream side and the downstream side than the valve body in the intake pipe, and in the intake pipe there are openings on the upstream side and the downstream side of the same bypass flow path, The pressure to flow the intake is small. For this reason, it is necessary to design the capacity of the bypass flow passage of each intake pipe large in order to flow a desired amount of bypass intake air to the bypass flow passage regardless of the initial opening degree of the valve body. is there.

  An object of the present invention is to provide an intake control device capable of supplying a desired amount of bypass intake air even if the capacity of the bypass flow path is relatively small.

The intake control device according to the first invention is
An intake control device for controlling an intake amount of an internal combustion engine, comprising:
A plurality of intake pipes through which intake air introduced into the internal combustion engine passes;
A valve body provided in each intake pipe to adjust an intake amount in the intake pipe;
Comprising the same number of cross bypass passages as the number of intake pipes;
Each cross bypass passage has an upstream opening opened on the inner wall surface upstream of the valve body of one intake pipe and a downstream opening opened on the inner wall surface downstream of the valve body of another intake pipe With an opening,
The downstream openings are characterized by one for each intake pipe.

  According to the first aspect of the present invention, it is relatively possible between the downstream side of one intake pipe where the corresponding cylinder of the internal combustion engine is not in the intake process and the upstream side of the other intake pipe where the corresponding cylinder is in the intake process. Large pressure differences occur. Therefore, even if the capacity of the cross bypass passage is relatively small, a sufficient amount of bypass intake can be supplied to the downstream side of the single intake pipe via the cross bypass passage between both intake pipes. .

  Therefore, by adopting such a cross bypass passage, it is possible to reduce the volume of the bypass passage for supplying bypass intake air, and to configure the bypass passage in a compact manner.

  Further, in the vicinity of the gap between the valve body and the inner surface of the intake pipe, intake air having a higher flow velocity is generated compared to the periphery thereof, so the pressure in the vicinity of the gap is low. For this reason, when the upstream side opening of the bypass passage is provided in the vicinity of the gap, a desired amount of intake air can not flow in the bypass passage.

  In this regard, according to the first aspect of the invention, the degree of freedom in the layout of the openings is increased because the restriction on the location where the openings of the cross bypass passage are provided is less. This makes it possible to reduce the length of the intake pipe.

  An intake control device according to a second aspect of the present invention is the intake control device according to the first aspect, wherein the intersection bypass passage between at least a pair of intake pipes of the plurality of intake pipes is upstream of the valve body of one intake pipe. The first cross bypass passage from the inner wall surface of the second intake pipe to the inner wall surface downstream of the valve body of the other intake pipe, and the inner wall surface of the other intake pipe upstream of the valve body of the other intake pipe; A second intersection bypass passage leading to the inner wall surface downstream of the valve body is provided.

  According to the second aspect of the present invention, in the case where an even number of intake pipes are provided, the intake pipes can be arranged in units of pairs by configuring them as the above-mentioned intake pipe pairs. Thereby, the layout of the intake pipe can be improved.

An intake control device according to a third aspect of the present invention is the first or second aspect, wherein
A body integrally including the plurality of intake pipes and a connection portion connecting the plurality of intake pipes;
At least one straight cross bypass passage is provided inside the connection portion.

  According to the third aspect of the present invention, it is possible to achieve downsizing of the intake control system since it is not necessary to provide at least one cross bypass passage outside the body. Further, since the cross bypass passage is straight, it can be easily formed by drilling using a drill.

  An intake control device according to a fourth aspect of the invention is characterized in that, in the third aspect of the invention, a plurality of the body is provided.

  According to the fourth aspect of the invention, the same effect as that of the third aspect of the invention can be obtained by configuring the internal combustion engine that requires four or more intake pipes using a plurality of bodies.

FIG. 1 is a schematic view showing an intake control device according to a first embodiment of the basic concept of the present invention. FIG. 2A is a cross-sectional view taken along the line A-A in FIG. 2B of the intake control device according to the second embodiment of the present invention, and FIG. 2B is a cut along the line B-B in FIG. 2A of the intake control device FIG. It is a perspective view which shows typically the intake control system concerning a 3rd embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described using the drawings. FIG. 1 shows an intake control device of a first embodiment according to the basic concept of the present invention. The intake control device 1 controls an intake amount of the internal combustion engine 2. In FIG. 1, only elements necessary to clearly show the main points of the basic concept are schematically shown.

  As shown in FIG. 1, the intake control device 1 is provided to a plurality of intake pipes 4 through which intake air passes through an air cleaner 3 introduced to an internal combustion engine and each intake pipe 4 to adjust the intake amount in the intake pipe 4 And the number of cross bypass passages 6 equal to the number of intake pipes 4. Each cross bypass passage 6 opens in the inner wall surface downstream of the valve body 5 of another intake pipe 4 and the upstream opening 7 opened in the inner wall surface of the one intake pipe 4 on the upstream side of the valve body 5 And the downstream opening 8.

  One downstream opening 8 exists for each intake pipe 4. The valve body 5 of each intake pipe 4 is rotatably supported via a common valve shaft 9. Each cross bypass passage 6 is provided with a throttle 10 for adjusting the amount of bypass intake air flowing therethrough.

  In this configuration, when the internal combustion engine 2 is driven, the timing of intake air differs for each cylinder of the internal combustion engine 2 corresponding to each intake pipe 4. In this case, when the suction process is started in the first cylinder of the internal combustion engine 2, the pressure decreases in response to the volume change in the first cylinder downstream of the valve body 5 of the corresponding one intake pipe 4 Do.

  Furthermore, if the valve body 5 is open even slightly, the intake air on the upstream side of the valve body 5 passes through the gap between the valve body 5 and the inner wall surface of the first intake pipe, and the downstream side of the valve body 5 It will flow to the side, and a decrease in pressure due to the increase in flow velocity will also occur on the upstream side of the valve body 5. On the other hand, in the other intake pipe 4 corresponding to the second cylinder, almost no intake flow occurs, so the decrease in air pressure accompanying the occurrence of the intake flow is small in the other intake pipe 4.

  On the other hand, a relatively large pressure difference occurs between the upstream side of the one intake pipe 4 and the downstream side of the other intake pipe 4. Therefore, if the cross bypass passage 6 is connected from the upstream side of the valve body 5 of the one intake pipe 4 to the downstream side of the valve body 5 of the other intake pipe 4, On the downstream side, an appropriate amount of bypass intake air is supplied through the cross bypass passage 6 with the influence of the opening degree of the valve body 5 being minimized.

  Each intake pipe 4 is connected by the cross bypass passage 6 as described above while taking into consideration the intake timing of the cylinder corresponding to each intake pipe 4 utilizing the action of the cross bypass path 6 as described above. As a result, a sufficient amount of bypass intake can be accommodated from the downstream side of each intake pipe 4 by the cross bypass path 6 having a smaller capacity than the bypass path bypassing from the upstream side to the downstream side for each conventional intake pipe. Each cylinder of the internal combustion engine 2 can be supplied.

  According to the present embodiment, since the cross bypass passage 6 is adopted, the capacity of the bypass passage for supplying the bypass intake can be suppressed, and the bypass passage can be compact.

  Further, in the vicinity of the gap between the valve body 5 and the inner surface of the intake pipe 4, intake air having a higher flow velocity is generated compared to the periphery thereof, so the pressure in the vicinity of the gap is low. For this reason, when the upstream side opening of the bypass passage is provided in the vicinity of the gap, a desired amount of intake air can not flow in the bypass passage.

  In this respect, according to the present embodiment, since the restriction on the portion where the opening of the cross bypass passage 6 is provided is small, the freedom of the layout of the opening is increased. As a result, the length of the intake pipe 4 can be shortened.

  2A and 2B show an intake control device 1b according to a second embodiment of the present invention. As shown in FIGS. 2A and 2B, the intake control device 1b includes two intake pipes 4a and 4b through which intake air introduced into the internal combustion engine passes, a connecting portion 11 connecting the intake pipes 4a and 4b, and intake air. And a body 12 integrally formed by integrally forming the pipes 4a and 4b and the connecting portion 11.

  The intake control device 1 b may include a control unit that controls an internal combustion engine, an accelerator position sensor, and the like. Each intake pipe 4a and 4b is provided with a valve body 5 for adjusting the amount of intake air in the intake pipes 4a and 4b.

  The intake pipes 4a and 4b are connected to the air cleaner on the upstream side (upper side in FIG. 1) and to the combustion chamber of the internal combustion engine on the downstream side (lower side in FIG. 1). Here, a butterfly type is used as the valve body 5. Each valve body 5 of the intake pipes 4 a and 4 b is rotatably supported by the body 12 via a common valve shaft 9.

  The connecting portion 11 extends in the direction from the intake pipe 4a to the intake pipe 4b and in the direction in which both the intake pipes 4a and 4b extend to connect the plate-like connection base 13 connecting the two intake pipes 4a and 4b. Prepare. The connection base 13 is provided with a rib 14 for reinforcement.

  The body 12 passes through the inside of the connecting portion 11, one end opens to the inner wall surface 15 upstream of the valve body 5 of the intake pipe 4a, and the other end extends to the inner wall surface 15 downstream of the valve body 5 of the intake pipe 4b. An open linear cross bypass passage 6a is provided. The body 12 also passes through the inside of the connection portion 11 and opens on the inner wall surface 15 upstream of the valve body 5 of the intake pipe 4b, and the other end is on the inner wall surface 15 downstream of the valve body 5 of the intake pipe 4a. An open linear cross bypass passage 6b is provided.

  Connection base portion 13 has overhang portions 16a and 16b which are portions in which a portion in the circumferential direction of each peripheral wall of cross bypass passages 6a and 6b is projected to one side and the other side in the thickness direction of connection base 13, respectively. Prepare. The connection base 13 is provided with a valve shaft storage portion 17 through which the valve shaft 9 passes.

  Cross bypass passages 6 a and 6 b are present on both sides in the thickness direction of the connection base 13 of the valve shaft storage portion 17. Therefore, both sides of the connecting portion 11 are reinforced in a well-balanced manner by the overhanging portions 16a and 16b which constitute the peripheral walls of the cross bypass passages 6a and 6b.

  The cross bypass passages 6a and 6b have, on the downstream side, a small diameter portion 18 having a smaller diameter than the upstream side. An insertion hole 20 for inserting an idle screw 19 is in communication with each small diameter portion 18 of the cross bypass passages 6a and 6b. These insertion holes 20 are provided perpendicularly to the connection base 13, and any insertion holes 20 are provided so that the idle screw 19 can be inserted and operated from the front side toward FIG. 2A.

  In FIG. 2A, the cross section of the tip of the idle screw 19 projecting to the small diameter portion 18 of the cross bypass passage 6a, the cross section of the hole forming portion 21a where the insertion hole 20 is formed, and the proximal end of the idle screw 19 of the cross bypass passage 6b. A cross section of the portion and a hole forming portion 21b in which the insertion hole 20 is formed are shown.

  On the rear side (the rear side as viewed in FIG. 2A) of the intake pipe 4b in the body 12, a motor housing portion 22 in which a motor for rotating the valve shaft 9 is housed is provided. Further, on one end side (left side in FIG. 2A) of the valve shaft 9 in the body 12, a gear mechanism for transmitting the rotation of the motor to the valve shaft 9, an opening degree sensor for detecting the opening degree of the valve body 5, etc. A mechanism storage unit 23 is provided for storing the

  As shown in FIG. 2B, in the hole forming portion 21a, the corresponding cross bypass passage 6a is located on the opposite side to the motor housing portion 22 across the connection base 13, and protrudes to the opposite side to the motor housing portion 22. It is arranged.

  The cross bypass passage 6a is formed by inserting a drill from the opening on the air cleaner side (upper side in FIG. 1) of the intake pipe 4a, positioning the tip of the drill on the inner wall of the intake pipe 4a, and using the drill to the overhang 16a. This is performed by drilling along the inner wall of the intake pipe 4b until it penetrates. Similarly, the cross bypass passage 6b is formed by inserting a drill from the opening on the air cleaner side and drilling along the overhang portion 16b.

  The insertion hole 20 of the idle screw 19 in the cross bypass passage 6a is formed by drilling from the end face of the hole forming portion 21a of the body 12 with a drill for forming the same. Similarly, the insertion hole 20 of the idle screw 19 in the cross bypass passage 6 b is formed by drilling from the end face of the hole forming portion 21 b of the body 12.

  In this configuration, the opening degree of the valve body 5 is adjusted by driving the motor of the motor accommodation portion 22 while referring to the opening degree of the valve body 5 by the opening degree sensor in the mechanism accommodation portion 23. During idling of the internal combustion engine, the valve body 5 is substantially closed, and intake air is supplied from the upstream side of the valve body 5 of the intake pipes 4a and 4b to the respective combustion chambers of the internal combustion engine via the cross bypass passages 6a and 6b. . During this time, the intake air amount preset by the idle screws 19 of the cross bypass passages 6a and 6b passes through the cross bypass passages 6a and 6b.

  At this time, as in the first embodiment, a sufficient amount of cross bypass passages 6a and 6b is sufficient compared to the conventional bypass passages bypassing from the upstream side to the downstream side of each intake pipe. Bypass intake air is supplied from the downstream side of each intake pipe 4a and 4b to each cylinder of the corresponding internal combustion engine.

  According to this embodiment, the cross bypass passages 6a and 6b are linear and communicate with the upstream side of one of the pair of intake pipes 4a and 4b and the downstream side of the other intake pipe. For this reason, each of the intake pipes 4a and 4b inserts a drill from the opening on the upstream side of one intake pipe, and performs drilling only in one place of the body 12 to the downstream side of the other intake pipe. The bypass passage can be easily formed.

  Further, since the cross bypass passages 6a and 6b need not be provided outside the body 12, the intake control device 1b can be miniaturized.

  In addition, in the case where an even number of intake pipes are provided, the intake pipes can be arranged in pairs by configuring them as the above-described intake pipes 4a and 4b. Thereby, the layout of the intake pipe can be improved.

  FIG. 3 shows an intake control device 1c according to a third embodiment of the present invention. Note that FIG. 3 schematically shows only the elements necessary to clearly show the main points of the present embodiment. Further, in FIG. 3, the same elements as those in FIGS. 2A and 2B are denoted by the same reference numerals.

  The intake control device 1c includes two pairs of intake pipes 4a and 4b of the intake control device 1b according to the second embodiment described above. The valve stems 9 of each pair are directly connected or one common one.

  One end of the intake pipe 4a opens upstream of the valve body 5 of the intake pipe 4a, and the other end of the intake pipe 4b downstream of the valve body 5 of the intake pipe 4a as a cross bypass passage between each pair of intake pipes 4a and 4b. An open linear cross bypass passage 26a is provided. In addition, a linear cross bypass passage 26b is provided, which opens on the upstream side of the valve body 5 of the intake pipe 4b and whose other end opens on the downstream side of the valve body 5 of the intake pipe 4a.

  However, the cross bypass passages 26 a and 26 b have, on the upstream side, a small diameter portion 27 whose diameter is smaller than that of the downstream side. An idle screw 19 is provided for each small diameter portion 27.

  The valve shaft 9 is driven by the motor with reference to the opening degree detected by the opening degree sensor, as in the second embodiment. Other configurations and actions are the same as in the second embodiment.

  According to this embodiment, the present invention can be easily applied to an internal combustion engine that requires four or more intake pipes.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this. For example, in the third embodiment, instead of directly connecting the valve stems 9 of each pair, the difference in rotational angle between the valve stems 9 is machined to match or synchronize the opening degree of each pair of valve bodies 5. It may be connected via a tuning mechanism 28 for adjusting.

1, 1b, 1c: Intake control device, 2: Internal combustion engine, 3: Air cleaner, 4, 4a, 4b: Intake pipe, 5: Valve body, 6, 6a, 6b, 26a, 26b: Cross bypass passage, 7: Upstream Side opening, 8: downstream opening, 9: valve shaft, 10: throttle, 11: connection, 12: body, 13: connection base, 14: rib, 15: inner wall surface, 16a, 16b: overhang , 17: valve shaft storage portion, 18, 27: small diameter portion, 19: idle screw, 20: insertion hole, 21a, 21b: hole formation portion, 22: motor storage portion, 23: mechanism storage portion, 28: tuning mechanism.

Claims (4)

An intake control device for controlling an intake amount of an internal combustion engine, comprising:
A plurality of intake pipes through which intake air introduced into the internal combustion engine passes;
A valve body provided in each intake pipe to adjust an intake amount in the intake pipe;
Comprising the same number of cross bypass passages as the number of intake pipes;
Each cross bypass passage has an upstream opening opened on the inner wall surface upstream of the valve body of one intake pipe and a downstream opening opened on the inner wall surface downstream of the valve body of another intake pipe With an opening,
The intake control device according to claim 1, wherein the downstream opening is provided for each intake pipe. The intake control device according to claim 1, wherein
Between the at least one pair of intake pipes of the plurality of intake pipes, as the cross bypass passage, the inner wall surface of the one intake pipe upstream from the valve body of the one intake pipe downstream of the valve body of the other intake pipe A first intersecting bypass passage leading to the inner wall surface of the second intake passage, and a second intersecting bypass passage extending from the inner wall surface upstream of the valve body of the other intake pipe to the inner wall surface downstream of the valve body of the one intake pipe An intake control device comprising: The intake control device according to claim 1 or 2, wherein
A body integrally including the plurality of intake pipes and a connection portion connecting the plurality of intake pipes;
An intake control device comprising: at least one straight cross bypass passage inside the connection portion. The intake control device according to claim 3, wherein
An intake control device comprising a plurality of the bodies.