JP2009041398A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device for an internal combustion engine which is compact and can obtain an intake resonance effect in a wide speed range.
A communication device (7) provided between resonance tubes (independent intake passages) (6a, 6b) includes a first communication passage (11), a second communication passage (12), and a switching valve (20). The first communication path 11 has one end 11α connected to the resonance tube 6a and the other end 11β opposed to the first port 13a of the resonance tube 6b. The second communication path 12 has one end 12α opposed to the second port 13b of the resonance tube 6b, folded at the folded portion 12β, and the other end 12γ aligned in parallel with the one end 12α. The switching valve 20 connects the other end 11β of the first communication path 11 and the first port 13a at the first switching position, and the other end 11β of the first communication path 11 at the second switching position. The other end 12γ of the second communication path 12 is connected, and the one end 12α of the second communication path 12 and the second port 13b are connected.
[Selection] Figure 1

Description

  The present invention relates to an intake device for an internal combustion engine.

In Patent Document 1, in an intake device of an internal combustion engine, a plurality of communication portions that communicate independent intake passages (resonance pipes) at different positions are provided in order to utilize the intake resonance effect in a wide range of rotation speeds in a low speed range. It has been shown that the required natural frequency can be obtained by changing the distance between the communicating position and the intake port by controlling the on-off valve provided in each communicating portion.
Japanese Patent Laid-Open No. 03-0661613

  However, in the intake device for an internal combustion engine described in Patent Document 1, by installing a plurality of communication portions, the intake passage (resonance tube) is long and the shape of the layout becomes complicated, so the ventilation resistance increases, In particular, there is a concern about rebounding at high speeds.

  In view of such circumstances, an object of the present invention is to provide an intake device for an internal combustion engine that is compact and can obtain an intake resonance effect widely from a low speed range to a high speed range.

  For this reason, in the present invention, the intake passage is made independent for each cylinder group that is grouped by cylinders that do not have the consecutive intake orders, and the following communication device is provided between the pair of independent intake passages. In this communication device, one end is connected to one independent intake passage, the other end is connected to a first port provided in the other independent intake passage, and one end is provided in the other independent intake passage. 2nd communication path facing the 2 ports, folded in the middle, and the other end parallel to the one end, the other end of the first communication path, both ends of the second communication path, and the first of the other independent intake passage The other end of the first communication path is connected at the first switching position, and the other end of the first communication path is connected to the first port at the first switching position. And a switching valve for connecting one end of the second communication path and the second port.

  According to the present invention, a pair of independent intake passages are provided via the first communication passage at the first switching position of the switching valve and via the first communication passage and the second communication passage at the second switching position. Can be communicated. Therefore, since the communication path length can be changed, the natural frequency of the intake system (tuned rotation speed of the intake resonance effect) can be changed, so that the intake resonance effect can be obtained in a wide speed range. In addition, since the communication device has a compact configuration, the ventilation resistance in the intake passage can be suppressed.

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

  FIG. 1 is a configuration diagram of an intake device for an internal combustion engine according to an embodiment of the present invention.

  The internal combustion engine 1 is a V-type 6-cylinder internal combustion engine composed of two banks on the left and right, the left bank 2a is provided with three cylinders 3a to 3c, and the right bank 2b is provided with three cylinders 3d to 3f. Yes. Here, the intake order (ignition order) of the cylinders 3a to 3f is cylinder 3a → cylinder 3d → cylinder 3b → cylinder 3e → cylinder 3c → cylinder 3f. That is, the cylinders in which the intake order is not continuous are grouped in each bank.

  Each of the cylinders 3a to 3f is provided with intake ports 4a to 4f for introducing intake air, and the intake ports 4a to 4c corresponding to the left bank 2a are connected to the collector portion 5a on the upstream side, respectively, The intake ports 4d to 4f corresponding to the bank 2b are connected to the collector portion 5b on the upstream side. Resonant tubes 6a and 6b independent of each other are provided on the upstream side of the collector portions 5a and 5b. That is, an independent intake passage composed of a collector portion and a resonance pipe is provided for each cylinder group that is grouped with cylinders that do not have an intake sequence in sequence.

  A communication device 7 capable of communicating these is provided between the resonance tubes 6a and 6b. Details of the communication device 7 will be described later.

  The resonance tubes 6a and 6b are provided with throttle valves 8a and 8b for adjusting the intake air amount between the collector portions 5a and 5b and the communication device 7, respectively, and an air cleaner is provided upstream of the communication device 7. 9a and 9b are provided. In addition to the above, the throttle valves 8a and 8b and the air cleaners 9a and 9b can be installed at arbitrary positions of the resonance tubes 6a and 6b. Further, the communication device 7 according to the present invention improves the fully open performance of the internal combustion engine 1 by the intake resonance effect. Therefore, when such an effect is manifested, it is assumed that the throttle valves 8a and 8b are fully open. .

  The communication device 7 described above includes a first communication passage 11, a second communication passage 12, and a switching valve 20.

  The first communication path 11 has one end 11α connected to the resonance tube 6a and the other end 11β opposed to the first port 13a provided in the resonance tube 6b.

  The second communication path 12 has one end 12α opposed to the second port 13b provided in the resonance tube 6b, folded in a U-turn shape at the folded portion 12β near the resonance tube 6a, and the other end 12γ parallel to the one end 12α. Are lined up.

  The switching valve 20 is interposed between the other end 11β of the first communication passage 11 and both ends 12α and 12γ of the second communication passage 12, and the first port 13a and the second port 13b. The switching valve 20 has two switching positions. In the first switching position, the other end 11β of the first communication path 11 and the first port 13a are connected, and in the second switching position, the first communication path. 11 is connected to the other end 12γ of the second communication path 12, and one end 12α of the second communication path 12 is connected to the second port 13b. FIG. 1 shows a state when the switching valve 20 is in the second switching position. In the present embodiment, the switching position of the switching valve 20 is changed by rotating the operating shaft of the actuator (motor) 21. In addition, the switching position can be changed by a hydraulic switching valve. .

  The first communication passage 11 is provided with a communication passage opening / closing valve 30 for opening and closing the communication passage. The communication passage opening / closing valve 30 and the switching valve 20 (actuator 21) are controlled by an engine control unit (ECU) (not shown) according to the engine operating state.

  Next, based on FIGS. 2-4, the detail of the communication apparatus in this embodiment is demonstrated.

  FIG. 2 shows details of the first communication path and the second communication path in the present embodiment. 2A is a perspective view of the first communication path and the second communication path, FIG. 2B is a cross-sectional view taken along line XX of FIG. 2A, and FIG. It is YY sectional drawing of a).

  Three passages are formed by an inner peripheral surface of the hollow cylindrical body 41 and a partition wall 42 (see FIG. 2B) that divides a cross section perpendicular to the central axis of the hollow cylindrical body 41 into three. One of the three passages is opened at both ends (11α, 11β) to serve as the first communication passage 11. The remaining two are closed at one end (folded portion 12β) by a closing member (the hatched portion in FIGS. 2 (A) and 2 (C)) and communicated with each other by cutting out the partition wall 42 (FIG. 2 (see (2), (3)), and the other ends (12α, 12γ) are opened (see FIG. 2 (2)) to form the second communication path 12. Thereby, one end 11α of the first communication path opens at one end of the hollow cylindrical body 41, and the other end 11β of the first communication path 11 and both ends of the second communication path 12 at the other end of the hollow cylindrical body 41. 12α and 12γ are opened side by side in the circumferential direction.

  FIG. 3 shows details of the switching valve in the present embodiment. 3A is a perspective view of the switching valve, and FIG. 3B is a ZZ cross-sectional view of FIG.

  The switching valve 20 has two cavities formed by an inner peripheral surface of a hollow cylinder 43 having the same inner diameter as the hollow cylinder 41 and a partition wall 44 that divides the cross section perpendicular to the central axis of the hollow cylinder 43 into two. ing. One of the two cavities (first cavity 45) has a cross-sectional area corresponding to one of the three passages and is open at both ends, while the other one (second The cavity 46) has a cross-sectional area corresponding to two of the three passages, is opened at one end thereof, and is closed at the other end by a closing member (the hatched portion in FIGS. The mouth is closed (see FIG. 3B).

  FIG. 4 is a diagram illustrating a method for switching the communication path length of the communication device according to the present embodiment.

  The switching valve 20 is provided at the other end of the hollow cylindrical body 41 (that is, an open end in which the other end 11β of the first communication path 11 and the two ends 12α and 12γ of the second communication path 12 are arranged in the circumferential direction). Has been placed. Further, the switching valve 20 can be rotated around the central axis of the hollow cylindrical body 41 by using the actuator 21, and the three opening ends arranged at the other end of the hollow cylindrical body 41 by this rotational position. Any one of them can be opened to the outside, and the other two can communicate with each other to block the outside.

  FIG. 4A shows a case where the rotation position of the switching valve 20 is the first switching position. The other end 11β of the first communication path is opened to the outside through the switching valve 20, and the first It communicates with the port 13a. At this time, the resonance tubes 6 a and 6 b communicate with each other via the first communication path 11. In FIG. 4A, the communication passage opening / closing valve 30 is not shown, but the communication passage opening / closing valve 30 is fully open.

  FIG. 4B shows a case where the rotation position of the switching valve 20 is the second switching position, and the other end 11β of the first communication path 11 and the other end 12γ of the second communication path 12 are switched. While communicating with each other via the valve 20 and blocking the outside, one end 12α of the second communication passage 12 is opened to the outside via the switching valve 20 and communicates with the second port 13b. At this time, the resonance tubes 6 a and 6 b communicate with each other via the first communication path 11 and further via the U-turn-shaped second communication path 12. In FIG. 4B, although the communication passage opening / closing valve 30 is not shown, the communication passage opening / closing valve 30 is fully opened.

  FIG. 4C shows a case where the rotation position of the switching valve 20 is the first switching position and the communication passage opening / closing valve 30 is fully closed. At this time, the communication path between the resonance tubes 6a and 6b is blocked.

  Therefore, when the communication path opening / closing valve 30 is fully open, the communication path length is longer when the switching valve 20 is in the second switching position than when the switching position is the first switching position. Further, the communication path is blocked by fully closing the communication path opening / closing valve 30. That is, by using the method shown in FIGS. 4A to 4C, the communication device 7 can set three different communication path lengths (short, long, no communication).

  Next, a method for controlling the switching valve and the communication passage opening / closing valve according to the engine operating state will be described with reference to FIGS.

  FIG. 5 is a diagram showing the setting of the communication device according to the engine operating state in the present embodiment, and FIG. 6 is a diagram showing the relationship between the engine speed and the engine torque in the present embodiment.

  FIG. 5A shows the setting of the communication device when the engine speed of the internal combustion engine 1 is in the middle speed range. The ECU sets the rotation position of the switching valve 20 to the first switching position and sets the communication passage opening / closing valve 30 to fully open. With this setting, the resonance tubes 6 a and 6 b communicate with each other via the first communication path 11. By using this communication path length, the natural frequency of the intake system (tuned rotation speed of the intake resonance effect) corresponds to the medium speed range, so the intake resonance effect in the medium speed range can be obtained, and the charging efficiency is improved. As shown in FIG. 6A, a good engine torque can be obtained in the middle speed range.

  FIG. 5B shows the setting of the communication device when the engine speed of the internal combustion engine 1 is in the low speed range. The ECU sets the rotation position of the switching valve 20 to the second switching position and sets the communication passage opening / closing valve 30 to fully open. With this setting, the resonance tubes 6 a and 6 b communicate with each other via the first communication path 11 and the second communication path 12. That is, the communication path length is longer than that in the above-described middle speed range. By using this communication path length, the natural frequency of the intake system (tuned rotation speed of the intake resonance effect) corresponds to the low speed range, so that the intake resonance effect in the low speed range can be obtained and the charging efficiency is improved. As shown in FIG. 6 (B), a good engine torque can be obtained in the low speed range.

  FIG. 5C shows the setting of the communication device when the engine speed of the internal combustion engine 1 is in the high speed range. The ECU sets the communication passage opening / closing valve 30 to be fully closed. With this setting, the communication path is blocked. As a result, the natural frequency of the intake system (tuned rotation speed of the intake resonance effect) corresponds to the high speed range, so that the intake resonance effect in the high speed range is obtained and the charging efficiency is improved, as shown in FIG. Thus, a good engine torque can be obtained at a high speed region. In this case, by setting the rotation position of the switching valve 20 to the first switching position, compared to when the switching position is set to the second switching position, between the communication passage opening / closing valve 30 and each of the resonance tubes 6a and 6b. Since the formed dead space is reduced and the passage lengths from the communication passage opening / closing valve 30 to the resonance tubes 6a and 6b are substantially equal, the natural frequency of the intake system can be changed with high response. .

  In the present embodiment, as a tuning technique for obtaining a desired intake resonance effect, a technique of partially changing the cross-sectional area of the first communication path 11 or the second communication path 12, or the folding of the second communication path 12 is performed. There is a method of changing the shape of the portion 12β. In addition to these, as shown in FIG. 7, there is also a method of communicating a resonator (a chamber having a predetermined volume) 50 with the second communication path 12 (or the first communication path 11). By these methods, it is possible to finely adjust the natural frequency of the intake system.

  According to the present embodiment, as the communication device 7, one end 11α is connected to one independent intake passage (resonance tube 6a), and the other end 11β is provided to the other independent intake passage (resonance tube 6b). The first communication passage 11 facing one end and the one end 12α are opposed to the second port 13b provided in the other independent intake passage (resonance tube 6b), and are folded back in a U-turn shape at the middle folding portion 12β. Are arranged in parallel with the one end 12α, the other end 11β of the first communication passage 11, both ends 12α and 12γ of the second communication passage 12, and the first of the other independent intake passage (resonance tube 6b). It is interposed between the port 13a and the second port 13b, and connects the other end 11β of the first communication path 11 and the first port 13a at the first switching position, and the first switching position at the first switching position. Connect the other end 11β of the communication path and the other end 12γ of the second communication path In addition, by providing the switching valve 20 that connects the one end 12α of the second communication path 12 and the second port 13b, the communication path length can be changed, so that the natural frequency of the intake system can also be changed. Therefore, the tuning rotational speed of the intake resonance effect can also be changed. Further, since the connection between the independent intake passage (resonance pipes 6a and 6b) and the coupling device 7 is simple, the ventilation resistance in the independent intake passage (resonance pipes 6a and 6b) can be suppressed.

  Further, according to the present embodiment, the section perpendicular to the central axis of the hollow cylindrical body 41 is divided into three by the partition wall 42, and three passages are formed by the partition wall 42 and the inner peripheral surface of the hollow cylindrical body 41. One of these three passages opens at both ends 11α and 11β to form the first communication passage 11, and the other two communicate with each other at one end (folded portion 12β) and the other end ( 12α and 12γ) are opened to form the second communication path 12, and the space saving of the communication device 7 can be realized.

  Further, according to the present embodiment, at the other end of the hollow cylindrical body 41, the other end 11β of the first communication path 11 and the two ends 12α and 12γ of the second communication path 12 are opened side by side in the circumferential direction. The switching valve 20 is disposed at the opening end of the hollow cylindrical body 41. The switching valve 20 can be rotated around the central axis of the hollow cylindrical body 41, and one of the three opening ends is exposed to the outside depending on the rotation position. The first port 13a has a shape in which the other two are communicated with each other and blocked from the outside, and at the first switching position, the other end 11β of the first communication path 11 is opened to the outside. In the second switching position, one end 12α of the second communication path 12 is opened to the outside and the second port 13b is communicated, so that the communication path length can be switched with a compact configuration. Can do.

  Further, according to the present embodiment, communication / non-communication between the independent intake passages (resonance pipes 6a, 6b) is switched by providing the first communication passage 11 with the communication passage opening / closing valve 30 for opening and closing the communication passage. Since it is possible, the natural frequency of the intake system can be changed so as to achieve good charging efficiency in accordance with the engine operating state.

  Further, according to the present embodiment, since the resonator 50 is communicated with at least one of the first communication path 11 and the second communication path 12, the natural frequency of the intake system can be finely adjusted. The tuning rotation speed of the resonance effect can be finely adjusted.

  In this embodiment, the V-type engine including two banks has been described. However, the present invention is not limited to this. That is, the present invention is an engine in which an intake passage is made independent for each cylinder group formed by groups of cylinders that do not have consecutive intake orders, even in the case of a V-type engine and a horizontally opposed engine composed of two banks, and an in-line engine. If so, it is applicable.

The figure which shows the structure of the intake device of the internal combustion engine in one Embodiment of this invention. The figure which shows the detail of a 1st communicating path and a 2nd communicating path Diagram showing details of switching valve The figure which shows the switching method of the communication path length of a communication apparatus The figure which shows the setting of the communication device according to the engine operation state Diagram showing the relationship between engine speed and engine torque The figure which shows the structure of the intake device of the internal combustion engine at the time of making a resonator communicate with the 2nd communicating path

Explanation of symbols

1 Internal combustion engine 5a, 5b Collector part (independent intake passage)
6a, 6b Resonance tube (independent intake passage)
7 communication device 11 first communication passage 12 second communication passage 13a first port 13b second port 20 switching valve 30 communication passage on-off valve 41 hollow cylindrical body 42 partition wall 50 resonator

Claims (5)

In an intake device of an internal combustion engine in which an intake passage is made independent for each cylinder group that is grouped with cylinders that do not have consecutive intake orders, and a communication device that can communicate these is provided between a pair of independent intake passages.
As the communication device,
A first communication path having one end connected to one independent intake passage and the other end facing a first port provided in the other independent intake path;
A second communication path having one end opposed to the second port provided in the other independent intake passage, folded in the middle, and the other end parallel to the one end;
It is interposed between the other end of the first communication path and both ends of the second communication path, and the first port and the second port of the other independent intake path, and at the first switching position, The other end of the one communication path is connected to the first port, and at the second switching position, the other end of the first communication path is connected to the other end of the second communication path, and the second communication path is connected. An intake device for an internal combustion engine, comprising: a switching valve that connects one end of a passage and the second port.   A cross section perpendicular to the central axis of the hollow cylindrical body is partitioned into three by a partition wall, and three passages are formed by the partition wall and the inner peripheral surface of the hollow cylindrical body, and one of the three passages is The first communication passage is opened at both ends, and the other two are communicated with each other at one end and opened at the other end to form the second communication passage. Item 2. An intake device for an internal combustion engine according to Item 1.   At the other end of the hollow cylindrical body, the other end of the first communication path and the both ends of the second communication path are opened side by side in the circumferential direction, and the switching valve is disposed at these opening ends, The switching valve is rotatable about the central axis of the hollow cylindrical body, and one of the three opening ends is opened to the outside and the other two are communicated with each other depending on the rotation position. In the first switching position, the other end of the first communication path is opened to the outside to communicate with the first port, and in the second switching position, 3. The intake device for an internal combustion engine according to claim 2, wherein one end of the second communication passage is opened to the outside to allow the second port to communicate.   The intake device for an internal combustion engine according to any one of claims 1 to 3, wherein a communication passage opening / closing valve for opening and closing the communication passage is provided in the first communication passage.   The intake device for an internal combustion engine according to any one of claims 1 to 4, wherein a resonator is connected to at least one of the first communication path and the second communication path.

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