JPH03926A - Intake system for multicylinder internal combustion engine - Google Patents

Abstract

PURPOSE:To simplify the construction of an intake system by constituting a resonant chamber aggregate box provided on the intake system out of a pair of resonant chambers and a communicating chamber communicated to the respective chambers, and providing opening/closing valves between the communicating chamber and the respective resonant chambers. CONSTITUTION:A V type multicylinder internal combustion engine is provided with a resonant chamber aggregate box Bg having a pair of resonant chambers Cr-l, Cr-r in the intake system, and the upper stream side is connected to an intake air passage Pi and the lower stream side is connected to an intake manifold Mi. The resonant chambers Cr-l, Cr-r are communicated/intercepted with opening/closing valves 251, 25r. In this case, a communicating chamber Cs communicated to the respective resonant chambers Cr-l, Cr-r is provided, and the opening/closing valves 251, 25r are provided between the communicating chamber Cs and the respective resonant chambers Cr-l, Cr-r. By controlling these opening/ closing valves to open, an inertia supercharging distribution chamber of a large volume can be formed.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention is directed to improving the volumetric efficiency of a multi-cylinder internal combustion engine by controlling intake pressure fluctuations within the intake system. The present invention relates to an improvement in an air intake device, particularly in its resonant chamber gathering portion.

(2) Conventional technology In the intake system of a multi-cylinder internal combustion engine, by variably controlling the length and volume of the intake system according to the operating state of the engine,
The resonance effect is caused by the resonance of intake pressure fluctuations between cylinders that do not cause intake interference, or the negative pressure waves that exist at the start of intake in each cylinder are reflected by the volume expansion part provided in the intake system and returned to the intake boat. Various systems have already been proposed in which the volumetric efficiency is increased from low speeds to high speeds by utilizing the inertial effect of the engine. A pair of resonant chambers are formed, each of which communicates with a discontinuous group of cylinders, and an on-off valve is provided on the boundary wall between these two chambers to communicate or cut off the two chambers, and the intake system is controlled by opening and closing of this on-off valve. It has already been proposed that the supercharging system can be switched to a resonant supercharging system or an inertial supercharging system (see, for example, Japanese Patent Laid-Open No. 59-73520).

The above-mentioned intake system has a volume section separate from the intake manifolds in the gathering section of a pair of intake manifolds connected to cylinder groups whose intake strokes are not continuous, and an on-off valve is installed between the gathering section and the volume section. ing. By controlling the on-off valves to close, a pair of resonant supercharging systems are configured, and by controlling the on-off valves to open, a single inertial supercharging system is configured, thereby allowing the engine to rotate from a low speed range to a high speed. This improves the volumetric efficiency up to the area.

(3) Problems to be Solved by the Invention However, in the above-mentioned conventional intake device, since the gathering part and the volume part of the intake manifold are configured separately, it is difficult to simplify the structure and form a compact shape. It was difficult.

The present invention has been made in view of the above-mentioned circumstances, and provides an intake system in which a pair of resonant chambers communicates with another volume through an on-off valve, by simplifying the structure of the intake system and making the shape more compact. The purpose is to achieve this goal.

B6 Configuration of the Invention (1) Means for Solving the Problems According to the present invention, in order to achieve the above object, the inside of the resonance chamber collection box is divided into a pair of resonance chambers, and each resonance chamber has its upstream side connected to the outside air. The resonance passage leading to the engine is connected downstream thereof to the cylinder groups whose intake strokes are not consecutive, respectively, and the resonance chamber collection box is connected to the resonance chambers depending on the operating status of the engine,
Alternatively, in an intake system for a multi-cylinder internal combustion engine that is provided with an on-off valve that shuts off, the resonance chamber collection box is composed of the pair of resonance chambers and a communication chamber that communicates with each of the pair of resonance chambers. At the same time, the on-off valves are provided between the communication chamber and each of the resonance chambers, and by controlling the on-off valves to open, the pair of resonance chambers communicate with each other via the communication chambers, thereby increasing the temperature. It is characterized by the formation of a volumetric inertial supercharging distribution chamber, and the fuel supply means to the multi-cylinder internal combustion engine and the intake system can be of any type.

(2) Effect According to the above configuration, communication between the pair of left and right resonance chambers is cut off by the closing control of the on-off valve in the low-speed operating range of the engine, thereby creating a two-system resonance supercharging intake system in which intake air interference does not occur. In addition, in the high-speed operating range of the engine, the pair of resonance chambers and the communication chamber are communicated together by the opening control of the on-off valve to form an inertial supercharging distribution chamber with a large volume.
The two resonant supercharging intake systems are canceled to form an inertial intake system.

At this time, even if the volume of the resonance chamber is set to a volume that provides the optimum resonance supercharging effect in the low speed operating range of the engine, the volume of the inertial supercharging distribution chamber formed by the opening control of the on-off valve is By appropriately selecting the volume of the communication chamber, the volume can be set to an arbitrary volume independent of the volume of the resonance chamber. Therefore, the volume of the inertial supercharging distribution chamber can be set to a value that provides the optimum inertial supercharging effect in the high speed operating range of the engine.

This makes it possible to obtain high volumetric efficiency in both the low-speed and high-speed operating ranges of the engine.

Since the pair of resonance chambers and the communication chamber are formed in a common resonance chamber collection box, and the on-off valve is disposed within the resonance chamber collection box, the dimensions of the intake system can be made compact, and its structure can be simplified. can be converted into

(3) Embodiments Hereinafter, embodiments in which the present invention is applied to a V-type 6-cylinder internal combustion engine will be described with reference to the drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of the main part of a type 6-cylinder internal combustion engine equipped with the device of the present invention, and FIG. 2 is a plan view of the cylinder block. Figure 3 is an enlarged partial plan view taken along the line ■--■ in Figure 1, Figure 4 is a sectional view taken along line IV-IV in Figure 3, and Figure 5 is a cross-sectional view along line IV-IV in Figure 3.
■It is a sectional view along the line.

In Figures 1 and 2, the engine body E of the six-cylinder internal combustion engine
are a pair of lefts arranged in a figure 7 shape with respect to each other.

It is equipped with right engine blocks Bl and Br, and left and right engine blocks Bffi and Br are each cylinder block 1.
ffi, lr, and cylinder hands 2l, 2r joined to the deck surface thereof, and the left cylinder block 11! , three left cylinders 3Il are formed in series,
Three cylinders 3r are also formed in series in the right cylinder block lr.

Three cylinders 3 on the left! is the left cylinder group C where the intake strokes are not continuous, that is, the intake valves 10 described later do not overlap.
In addition, the three cylinders 3r on the right side also constitute a right cylinder group Cr in which the intake strokes are not continuous, that is, the intake valves 10 (to be described later) do not overlap.

Pistons 4 are slidably fitted into the left and right cylinders 3l and 3r, respectively, as usual, and these pistons 4
is interlocked with a crankshaft 6 via a connecting rod 5. Further, the left and right cylinder heads 2N and 2r are respectively formed with a combustion chamber 7 facing the piston 4 and a shear intake and exhaust boat 8.9 communicating with the combustion chamber 7, and each intake port 8.
are each provided with an intake valve 10 that opens and closes the boat 8, and each exhaust port 9 is provided with an exhaust valve 11 that opens and closes the port 9. And intake and exhaust valve 1
0.11 is opened and closed at predetermined timing by a conventionally known valve operating mechanism 12.

The plurality of intake ports 8 of the left and right cylinder heads 2l and 2r are connected to an intake system In which will be described in detail later, and the plurality of exhaust ports 9 of the left and right cylinder heads 21 and 2r are connected to a conventionally known exhaust system. A system (not shown) is connected.

Next, the configuration of the intake system In will be explained in detail with reference to FIGS. 2 to 5. The intake system In is disposed in a V space C between the left and right cylinder blocks in and lr, and includes an air cleaner Ac, An intake passage Pi connected to the outlet of the air cleaner Ac, and an intake passage Pi connected to the downstream end of the intake passage Pi.
A resonance chamber collection box Bg having a pair of left and right resonance chambers Cr-l and Cr-r, and a resonance chamber collection box Bg having a pair of left and right resonance chambers Cr-l and Cr-r connected to the end faces of the left and right cylinder blocks 1l and lr where the intake ports 8 are opened, Resonance chamber Cr-l, Cr-
r, and an intake manifold Mi, which will be described later, which communicates with the right and left cylinder groups Cr and C1, respectively.

As shown in FIG. 3, the intake passage Pi includes a throttle body 15 integrally connected to the downstream end of the intake passage 14 connected to the air cleaner Ac.

The intake passage 14 is formed into a hollow cylindrical shape to take in air from the air cleaner Ac, and the throttle body 15 connects to the left and right resonance passages 1 downstream of the connection part with the intake passage 14.
It branches into 8L and 18r. Inside both resonance passages 181 and 18r, there is a throttle valve 20jl that is controlled to open and close by a common operating section 19! , 2Or are provided. A resonance chamber assembly box Bg is integrally connected to the downstream end of the throttle body 15 with a bolt 16.

The resonance chamber collecting box Bg is composed of a collecting box main body 21 having a generally rectangular parallelepiped shape and having an open top surface, which is connected to the throttle body 15, and a lid body 22 which is hermetically attached to the open top surface of the collecting box body 21 with bolts 23. Lid body 22
is formed integrally with an intake manifold Mi, which will be described later.

As clearly shown in FIGS. 4 and 5, the resonance chamber collecting box Bg is defined by two partition walls 24j2 and 24r extending along the 6 direction of the engine crankshaft, that is, the flow direction of the intake air flowing inside the box 8g. The left and right resonance chambers Cr-42, Cr-r and the resonance chamber Cr-1 are parallel to each other! .

It is partitioned into a communication chamber Cs located between Cr and r. And this left and right resonance chamber Cr-1! ,,
The downstream ends of the left and right resonance passages 18C18r of the throttle body 15 communicate with the upstream end of Cr-r.

The two partition walls 24N and 24r are provided with on-off valves 25ffi and 25r for communicating the left and right resonance chambers Cr-l and Cr-r with the communication chamber Cs or for blocking the communication. That is, a rectangular valve port 26C26r is opened in the side partition walls 24l and 24r, and a rotatable valve inserted in the center of the partition wall 24C24r from the outside of the collection box main body 21 along the longitudinal direction of the intake system In is opened in the side partition walls 24l and 24r. Valve shafts 27L and 27r pass through the central portions of the valve ports 26l and 26r. Rectangular plate-shaped valve bodies 28j2, 28r provided at the valve ports 2642, 26r are fixed to the valve shafts 27l, 27r with screws 30. Valve stem 211! , 27r penetrates the rear end wall of the collection box main body 21 and protrudes to the outside, and a conventionally known actuator 29 is connected to the protruding end.

This actuator 29 is operated and controlled according to the operating state of the engine, and controls the opening and closing of the on-off valves 25L and 25r. For example, when the engine is operating at low speed, the on-off valves 251 and 25r are closed, and when the engine is operating at high speed, it closes the on-off valves 251 and 25r. The on-off valves 25j2 and 25r are controlled to open.

The volumes of the left, old, and sound chambers Cr-β, Cr-r when the on-off valves 25Il and 25r are closed are set to volumes that provide the optimum resonance supercharging effect in the low speed rotation range of the engine. Ru. Further, the volume of the communication chamber Cs is increased by controlling the open/close valves 25L to 25r to open the left and right resonance chambers Cr-1°Cr-r and the communication chamber Cs.
When the inertial supercharging distribution chamber ch with a large volume is formed as shown by the two-dot chain line in FIG. The volume is set so that an inertial supercharging effect can be obtained.

On the upper wall of the left resonance chamber Cr-β, Cr-r,
Three oval-shaped left and right discharge ports 341 and 34r are opened along its longitudinal direction. And the three exhaust ports 34j of the left resonance chamber Cr-1! are respectively communicated with the three cylinders 3r (intake order is not consecutive) of the right cylinder block lr located on the opposite side from the left resonance chamber Cr-1° through an intake manifold Mi, which will be described later, and are also connected to the right resonance chamber Cr. -r's three exhaust ports 34'' communicate with three cylinders 3j2 (intake order is not consecutive) of the left cylinder block I2 located on the opposite side from the right side resonance chamber Cr'' through an intake manifold Mi to be described later. be done.

The intake manifold Mi has six first to sixth branch pipes 35. which curve upwardly in a convex manner as shown in FIGS. 1 and 5. ~35
6 are integrally arranged in parallel in a direction substantially orthogonal to the longitudinal direction of the left and right resonance chambers Cr-1°Cr-r, and extend left and right, alternately crossing in opposite directions, and every other 3 The second one. 4th and 6th distribution pipes 35□, 354 and 3
5. The upstream ends of the resonant chambers Cr-41! are connected to the three exhaust bows 434ffi of the left resonance chamber Cr-1, respectively, and then connected to the resonant chambers Cr-41! and their downstream ends are communicated with the three cylinders 3r of the right cylinder block 1r, respectively, and the remaining three cylinders 1 and 3 at every other
and fifth distribution pipe 35l, 35. and 35. The upstream end of the three exhaust ports 34r of the right resonance chamber Cr-r
After that, they extend to the opposite side from the resonance chamber Cr-r, and their downstream ends are communicated with the three cylinders 3E of the left cylinder block 12, respectively.

As shown in FIG. 1, the first to sixth distribution pipes 35. A fuel injection nozzle 36 is provided on each earthen wall at the downstream end of the pipes 356 to 356.

Next, the operation of the embodiment of the present invention will be explained.

The operation of the actuator 29 is controlled according to the operating state of the engine. For example, in the low-speed operating state, the on-off valves 25N, 2
When the valve 5r is controlled to close and its valve ports 26l and 26r are closed as shown by solid lines in FIGS. 3 to 5, communication between the left and right resonance chambers Cr-l and Cr-r is cut off. In this state, there are resonance passages +8ffi18r for each cylinder group, left and right resonance chambers Cr-2°Cr-r for each cylinder group, and left and right distribution pipes 35. ,35,. 351,354,35s
, 356, that is, two resonant supercharging intake systems that do not cause intake interference from each of the three cylinders 3l and 3r to the outlet of the throttle body 15 are constructed, and the resonant chamber Cr- The volumes of l and Cr-r are set so that the natural frequency of the resonant supercharging system substantially matches the opening/closing period of each intake valve 10 in the low speed rotation range of the engine, so that the resonant supercharging effect is This is effectively achieved, increasing the volumetric efficiency in the engine's low-speed rotation range.

On the other hand, if the machine reaches high-speed operation, the on-off valve 251°25
r is controlled to open, and the left and right resonance chambers Cr-l, C
rr and the communication chamber Cs are integrally communicated through the valve ports 261 and 26r, forming an inertial supercharging distribution chamber ch with a large volume, and the chamber ch is connected to the left and right three cylinders 31.
, 3r.

In this state, the two resonant intake systems are canceled, the negative pressure wave generated during the engine intake stroke is reflected and reversed by the large volume inertial supercharging distribution chamber ch, and the positive pressure wave is transmitted to the intake air of each cylinder 31, 3r. The waves are propagated to the boat 8 to form an inertial supercharging system, and the length of the path through which the negative pressure waves and positive pressure waves propagate is shortened, and the intake pressure cycle matches the opening/closing cycle of the intake valve 10 when the engine rotates at high speed. can be done. Furthermore, by appropriately setting the volume of the communication chamber Cs, it is possible to secure a large volume of the inertial supercharging distribution chamber ch, which is necessary to enhance the inertial supercharging effect in the high speed rotation range of the engine. It is possible to effectively utilize the inertial supercharging effect and increase volumetric efficiency.

Furthermore, inside the resonance chamber collection box Bg, there is a pair of resonance chambers Cr -1! , Cr-r and the communication chamber are integrally formed, and the partition wall 21! , open/close valve 25I on 24r! , 25r are provided, the structure of the intake system is simplified and its shape can be made compact.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a sectional view of the same intake system as in FIG. 5, and the same reference numerals as in the first embodiment indicate the same members.

In this second embodiment, the resonance chamber collection box B
The structure of the on-off valves 25C and 25r' in g is different from the first embodiment. That is, the left and right partition walls 24j2, 24
Two valve ports 26226r' are opened in each of the four valve ports 26226r', and these four valve ports 26I! .

26r' are opened and closed simultaneously by two on-off valves 25f' and 25r' fixed to the left and right valve shafts 27ffi' and 27r'.

According to this embodiment, left, right resonant chambers Cr-1, C
rr and the communication chamber Cs each have two valve ports 2 on the left and right.
6j! ', 26r' to form an inertial supercharging distribution chamber ch, so that its responsiveness can be improved.

C0 Effects of the Invention As described above, according to the present invention, in a multi-cylinder internal combustion engine in which a resonance chamber collection box is installed, the resonance chamber collection box has a pair of resonance chambers and a communication line that communicates with each of the pair of resonance chambers. Since the communication chamber and each of the resonance chambers are each provided with an on-off valve, the pair of resonance chambers, the communication chamber, and the on-off valve can be compactly housed in the resonance chamber collection box. Ru. Therefore, the structure of the intake system is not only simplified and manufactured easily, but also its shape is compact, making it easier to layout it with respect to the engine.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of the main part of a type 6-cylinder internal combustion engine equipped with the device of the present invention, and FIG. 2 is a plan view of the cylinder block. Figure 3 is an enlarged partial plan view along the cotton line in Figure 1. Figure 4 is an enlarged partial plan view along the cotton.
Figure TV-A cross-sectional view along the TV line, Figure 5 is Figure 3 V-
FIG. 6, a sectional view taken along the line (2), shows a second embodiment of the present invention, and is a sectional view of the same intake system as FIG. 5. Bg...Resonance chamber gathering box, Cl, Cr...
- Cylinder group, Cr-l, Cr-r...Left and right resonance chambers, Cs...Communication chamber, ch...Inertia supercharging distribution chamber L8l, L8r-...Resonance passage, 2! M! , 25r-・
・On-off valve patent applicant: Honda Motor Co., Ltd. Agent: Kendo Ochiai 1) Takahide Naka

Claims (1)

[Claims] The inside of the resonance chamber collection box (Bg) is divided into a pair of resonance chambers (Cr-l, Cr-r), and each resonance chamber (Cr-l, Cr-r) has a resonance passage (which communicates with the outside air on its upstream side). 18l, 18r), and the downstream thereof is connected to cylinder groups (Cl, Cr) whose intake strokes are not consecutive, respectively, and furthermore, the resonance chamber collection box (Bg) is connected to both resonance chambers depending on the operating status of the engine. Chamber (Cr
-l, Cr-r) In an intake system for a multi-cylinder internal combustion engine, which is provided with on-off valves (25l, 25r) that communicate with each other or cut off each other, the resonance chamber collection box (Bg) resonant chamber (Cr-l
, Cr-r) and the pair of resonant chambers (Cr-l, C
The on-off valves (25l, 25r) are connected between the communication chamber (Cs) and each of the resonance chambers (Cr-l, Cr-r). ) are provided respectively, and by controlling the opening/closing valves (25l, 25r), the pair of resonance chambers (Cr-l, Cr-r) communicate with each other via the communication chamber (Cs), and a large An intake system for a multi-cylinder internal combustion engine, characterized in that an inertial supercharging distribution chamber (Ch) having a volume of: