JPH0739812B2 - Intake control method for V-type 6-cylinder internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial Field of Use The present invention relates to a V-type 6-cylinder internal combustion engine, in which the volumetric efficiency of the engine is controlled by controlling the intake pressure fluctuation in the intake system. The present invention relates to an intake control method for improving the intake air.

(2) Related Art In an intake system for a conventional multi-cylinder internal combustion engine, the intake pressure fluctuation between cylinders that does not cause intake interference resonates by variably controlling the length and volume of the intake system according to the operating state of the engine. Resonance effect or negative pressure wave generated at the start of intake in each cylinder is reflected in the volume expansion distribution chamber provided in the intake system and returned to the intake port side to exert an inertial effect, thereby reducing the engine speed. Various types of intake devices have been proposed which increase the volumetric efficiency up to the high speed range (for example, see Japanese Patent Laid-Open No. 62-99625).

The intake system divides a plurality of cylinders of a multi-cylinder internal combustion engine into cylinder groups in which the intake stroke is not continuous, extends each cylinder to an assembly section for each cylinder group in an independent intake passage, and the assembly sections for each cylinder group are mutually connected. A common intake passage for each independent cylinder group is used to collect at an upstream position of the collecting portion, and a communicating portion that branches from the middle of the independent intake passage to communicate the independent intake passages with each other is provided. It has a configuration in which an on-off valve is provided at each branch portion.

Thus, in the low speed operation range of the engine, the opening / closing valve is controlled to be closed to form a two-system resonance supercharging system, and in the high speed operation range of the engine, the opening / closing valve is controlled to open to control the inertial supercharging The system is constructed to improve the volumetric efficiency in a wide operating range of the engine.

(3) Problems to be Solved by the Invention However, in the above-described conventional intake device, when the inertial supercharging system is configured by communicating the independent intake passages with each other by the communicating portion in the high speed operation range, The collecting portion does not communicate with each other, but does communicate with each other for the first time in the collecting portion of the common intake passage for each cylinder group on the upstream side, and the communicating portion has a sufficient volume only by communicating the independent intake passages with each other. Therefore, the resonance supercharging effect remains uncancelled in the high-speed operation range, and it is difficult to obtain a sufficient inertia supercharging effect.

Further, since the resonance supercharging system is configured in the low speed operating range and the inertia supercharging system is configured in the high speed operating range, the two-step control is not performed, so that the sufficient volume efficiency cannot be obtained in the medium speed operating range. There was a problem.

The present invention has been made in view of the above circumstances, and provides an intake control method for a V-6 internal combustion engine capable of obtaining high volume efficiency not only in a low speed operation range but also in a medium / high speed operation range. The purpose is to do.

B. Configuration of the Invention (1) Means for Solving the Problems According to the present invention, in order to achieve the above object, it is possible to communicate with the atmosphere through the upstream throttle valve and mutually through the on-off valve. A pair of resonance chambers, a group of left and right cylinders whose intake strokes are not continuous, and a distribution pipe that connects the resonance chambers to each other, and an intermediate portion of the distribution pipe is connected to the pipe length switching chamber via a pipe length switching valve. V type 6 made possible
In a cylinder internal combustion engine, the pair of resonance chambers and the distribution pipe are respectively housed in a lower part and an upper part in a V bank,
An intermediate portion of the distribution pipe is connected to the lower surface of the pipe length switching chamber arranged above the distribution pipe, and a distribution pipe extending from the pipe length switching chamber to the left and right cylinder groups is formed in a substantially straight line, so that the engine operates at low speed. In the region, the on-off valve and the pipe length switching valve are both closed and controlled to form two resonance supercharging systems,
In the medium speed operation range of the engine, the opening / closing valve is controlled to be open and the pipe length switching valve is controlled to be closed, thereby forming a long pipe inertial supercharging system in which the resonance chambers communicating with each other are substantially open to the atmosphere. However, in the high-speed operating range of the engine, both the on-off valve and the pipe length switching valve are controlled to open, and the intermediate portion of the distribution pipe is connected to the pipe length switching chamber that is substantially the open end of the atmosphere, so that the short pipe inertia It is characterized by configuring a feeding system.

(2) Operation According to the above feature, by controlling both the on-off valve and the pipe length switching valve to be closed in the low speed operation range of the engine, the communication between the pair of resonance chambers is cut off and the intermediate portion of each distribution pipe is connected. Communication between the pipe length switching chambers is cut off, and each distribution pipe connects each resonance chamber through its entire length to a group of cylinders whose intake stroke is not continuous. As a result, two systems of resonance supercharging system are configured to improve the volume efficiency in the low speed operation range. On the other hand, by controlling the open / close valve to open in the medium speed operation range of the engine and keeping the pipe length switching valve closed, each cylinder group is connected to the resonance chamber through the entire length of the distribution pipe. . As a result, the resonance chambers that are in communication with each other serve as a substantial open end to the atmosphere, forming an inertia supercharging system with a long pipe length, and improving the volume efficiency in the medium speed operation range. Further, in the high-speed operation region of the engine, the opening / closing valve and the pipe length switching valve are both controlled to open so that the intermediate portion of each distribution pipe communicates with the pipe length switching chamber. As a result, the pipe length switching chamber becomes a substantially atmospheric open end to form an inertial supercharging system with a short pipe length, and the volume efficiency in the high speed operation range is improved. In addition, since the resonance chamber and the distribution pipe are housed in the V bank of the engine, the intake system can be compactly integrated with the engine, or the inertia supercharging system with a short pipe length is configured in the high speed operation range of the engine. When this is done, the pipe length switching chamber and the left and right cylinder groups are connected by a distribution pipe that extends in a substantially straight line, so that the output can be increased.
Moreover, the resonance chamber, the distribution pipe, and the pipe length switching chamber are symmetrically arranged, so that the characteristics of the intake systems of the left and right cylinder groups can be easily matched.

(3) Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

1 to 8 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a V-type 6 cylinder internal combustion engine to which an intake control method according to the present invention is applied, and FIG. 2 is a cylinder block thereof. Of FIG. 3, FIG. 3 is an enlarged partial plan view of the III-III line of FIG. 1, FIG. 4 is an enlarged partial plan view of the IV-IV line of FIG. 1, and FIG.
6 is a sectional view taken along line VI-VI in FIG. 5, FIG. 7 is a sectional view taken along line VII-VII in FIG. 5, and FIG. 8 is a graph showing engine speed and torque. It is a graph which shows a relationship.

In FIGS. 1 and 2, the engine body E of the 6-cylinder internal combustion engine is shown.
Includes a pair of left and right engine blocks Bl, Br which are arranged in a V shape with respect to each other. The left and right engine blocks Bl, Br are
Each has cylinder blocks 1l, 1r and cylinder heads 2l, 2r joined to its deck surface, and three left cylinders 3l are formed in series on the left cylinder block 1l,
Further, three cylinders 3r ... Are formed in series in the right cylinder block 1r. The three cylinders 3l on the left side form a left cylinder group Cl in which the intake stroke is not continuous, that is, the intake valves 10 do not overlap, and the three cylinders 3r on the right side also do not have continuous intake strokes, that is, the intake valves described later. 10 constitutes the right side cylinder group Cr which does not overlap.

Pistons 4 are slidably fitted in the left and right cylinders 3l, 3r, respectively, as usual, and these pistons 4 are interlocked with a crankshaft 6 via connecting rods 5.
Further, the left and right cylinder heads 2l, 2r are respectively formed with a combustion chamber 7 facing the piston 4 and intake / exhaust ports 8, 9 communicating with the combustion chamber 7, and each intake port 8 has a corresponding port. An intake valve 10 for opening and closing 8 is provided, and an exhaust valve 11 for opening and closing the port 9 is provided for each exhaust port 9. And intake and exhaust valves 10,11
Is opened and closed at a predetermined timing by a conventionally known valve mechanism 12.

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

Next, the configuration of the intake system In will be described in detail with reference to FIGS. 2 to 7. The intake system In is disposed in the V space C between the left and right engine blocks 1l and 1r, and the air cleaner Ac
And the intake passage Pi connected to the outlet of this air cleaner Ac.
A box-shaped volume expansion portion Bg having a pair of left and right resonance chambers Cr-l, Cr-r connected to the downstream end of the intake passage Pi, and intake air of the left and right cylinder blocks 1l, 1r. The left and right resonance chambers Cr-l and Cr-r are joined to the end faces where the ports 8 are opened and communicate with the left and right cylinder groups Cl and Cr, respectively. As described above, since the intake system In is housed in the V space C of the engine body E, the V space C can be effectively used to make the entire engine compact. Further, the pair of resonance chambers Cr-l As is apparent from FIG. 1, Cr-r, since the distributor pipe 35 _{1-35 6} and pipe length switching chamber Cc are arranged symmetrically,
The characteristics of the intake system for the left and right cylinder groups Cl and Cr do not become unbalanced.

The intake passage Pi is provided with an air cleaner Ac as shown in FIG.
At the downstream end of the upstream intake passage 14
A downstream side intake passage 16 is integrally connected via 15. The upstream intake passage 14 is formed of a hollow cylinder to suck intake air from the air cleaner Ac, and has a throttle body.
An axial end of the valve 15 is fixed to the upstream intake passage 14 and the downstream intake passage 16 by bolts 17 and 18, respectively, and a throttle valve 20 whose opening and closing is controlled by an operating portion 19 is provided therein.

The downstream side intake passage 16 has a rectangular cross section and extends along the direction of the crankshaft 6 of the engine, and the inside thereof is a partition wall.
Left and right branch resonance passages 22l, 22r parallel to each other by 21
It is divided into The left and right branch resonance passages 22l,
The upstream end of 22r is connected to the throttle body 15. An opening / closing valve 23 is provided in the partition wall 21 near the downstream side of the downstream side intake passage 16. That is, the partition wall
21 is provided with a valve holder 25 that opens a valve port 24 that communicates the left and right branch resonance passages 22l, 22r.
A valve shaft 26 extending along the axial direction of the downstream side intake passage 16 is rotatably supported, and a rectangular plate-shaped valve body 27 for opening and closing the valve opening 24 is fixed to the valve shaft 26 with screws 28. ing. One end of the valve shaft 26 penetrates the end wall of the valve holder 25 and projects to the outside of the downstream side intake passage 16, and a conventionally known actuator 29 is connected to the projecting end. This actuator 29 is operated and controlled according to the operating state of the engine to open / close the opening / closing valve 23, closes the opening / closing valve 23 at low speed operation of the engine, and at the middle speed and high speed rotation thereof. The on-off valve 23 is controlled to open.

On the left and right sides of the downstream side intake passage 16, the left and right resonance chambers Cr- of the volume expansion part Bg are arranged so as to sandwich the intake passage 16.
l, Cr-r are formed integrally in parallel with the downstream side intake passage 16.

As shown in Figs. 1 and 5, the left and right resonance chambers Cr-l, Cr-r
Also, the downstream side intake passage 16 is integrally formed inside the volume expansion portion Bg including a box-shaped body 31 connected to the lower portion of the manifold Mi by a plurality of bolts 32. Downstream intake passage
At the downstream end of 16, on the left and right sides thereof, left and right communication ports 33l, which communicate with the resonance chambers Cr-l, Cr-r, respectively.
33r is opened. And the left and right communication ports 33l, 33r
Are arranged in the vicinity of the valve opening 24 and are arranged in parallel so as to face both sides of the valve opening 24.

When the valve body 27 is closed, the left and right branch resonance passages 22l and 22r are independently connected to the left and right resonance chambers Cr-l and Cr-r through the communication ports 33l and 33r, respectively. And forms two resonance supercharged intake systems.

When the valve body 27 is opened, the left and right resonance chambers Cr-
l, Cr-r are the valve port 24 and the left and right communication ports 33l, 3
The inertial supercharging distribution chamber Ch having a large volume, which is shown in FIG.

On the upper walls of the left and right resonance chambers Cr-l, Cr-r, three left and right exhaust ports 34l, 34r, ... each having an oval shape are formed along the longitudinal direction thereof. The three exhaust ports 34l of the left resonance chamber Cr-1 are connected to the three cylinders 3r of the right cylinder block 1r located on the opposite side of the left resonance chamber Cr-1 via an intake manifold Mi (described below). Are not continuous),
Similarly, three exhaust ports 34r of the right resonance chamber Cr-r
Are communicated with three cylinders 3l of the left cylinder block 1l located on the opposite side of the right resonance chamber Cr-r (the intake order is not continuous) via an intake manifold Mi described later.

As shown in FIGS. 4 to 7, in the intake manifold Mi, the six first to sixth distribution pipes 35 _{1 to} 35 _{6 in} which the upstream side is curved upwardly and the downstream side is substantially linear are the downstream side intake passages. 16 and the left and right resonance chambers Cr-l, Cr-r are arranged side by side in a direction substantially orthogonal to the longitudinal direction and alternately intersect in opposite directions and extend left and right. Second, fourth
And sixth minutes pipe 35 _2, 35 ₄ and 35 upstream ends of ₆ extends on the opposite side of the resonance chamber Cr-l after passed through respectively with the three exhaust ports 34l ‥ left resonance chamber Cr-l thereof Three cylinders with a cylinder block 1r on the downstream side on the right side
3r respectively passed through with the ‥, and the remaining one of three first placed, the third and fifth minute pipe 35 _1, 35 ₃ and 35 ₅ of the upstream end of the three exhaust ports of the right resonance chamber Cr-r 34r, and then extends on the opposite side of the resonance chamber Cr-r, and their downstream ends are respectively connected to the three cylinders 3l of the left cylinder block 1l.

A cover 37 is fixed to the upper surface of the intake manifold Mi by a plurality of bolts 36, and the six first to sixth distribution pipes 35 _{1 to} 35 ₆
A tube length switching chamber Cc is formed between the curved upper outer wall and the outer wall. The first to sixth of the pipe 35 _{1-35 6} and pipe length switching chamber Cc tube length of the right and left of the butterfly type in the boundary portion between the switching valve 38l, 38r is provided. That is, the first to sixth distribution pipes 3
5 _1-35 downstream end of the curved portion of the _6, and each of the curved outward wall valve ports 39 ₁ to 39 ₆ are opened, 3 distributing pipes 35 ₂ extending from the left resonance chamber Cr-l, The valve ports 39 ₂ , 39 ₄ , 39 ₆ formed in 35 ₄ , 35 ₆ communicate with the right side of the lower surface of the pipe length switching chamber Cc, and three distribution pipes 35 ₁ , 35 ₃ extending from the right resonance chamber Cr-r. , valve port 39 formed in the 35 _{5 1,} 3
9 _3, 39 ₅ communicates with the lower surface left side of the pipe length switching chamber Cc. The pair of left and right valve shafts 40l and 40r, which are rotatably supported by penetrating both sides of the intake manifold Mi, respectively include three on the left side.
A valve body 41 that crosses the center of each of the valve openings 39 ₁ , 39 ₃ , 39 ₅ and the three valve openings 39 ₂ , 39 ₄ , 39 ₆ on the right side and opens and closes each of the valve openings 39 _{1 to} 39 ₆ at that position. _{1-41 4} is secured with a screw 42. As apparent from FIG. 4, the valve body 41 _{1-41 4} is made of a plate member of the elliptical shape, the short axis the valve shaft 40 l, is fixed in a state that is aligned with the direction of 40r. The ends of both valve shafts 40l and 40r protruding from the intake manifold Mi are connected to an actuator 43 to control opening / closing of the pipe length switching valves 38l and 38r. , 38r is controlled to be closed, and the valve is controlled to be opened in the high speed rotation range.

As it is apparent from Figure 5, the valve port 39 ₁ to 39 the valve shaft passing through the center of the ₆ 40 l, 40r are located on schematic extension distributing pipes 35 ₁ to 35 ₆ curved outer wall, the valve body 41 _{1-41 6} is arranged to compensate for the distributor pipe 35 _{1-35 6} outer wall of which is cut away to form the valve port 39 ₁ to 39 ₆ in the closed position shown by solid lines. Thus, when the valve body 41 _{1-41 6} is closed, the cross-sectional area of the distributor pipe 35 _{1-35 6} is configured not to sudden change in the portion of the valve ports 39 ₁ to 39 _6. Also, the valve bodies 41 _{1 to 4 16}
There when in the open position shown by a chain line, downstream and pipe length switching chamber Cc forming the distributor pipe 35 _{1-35 6} schematically straight is formed so as to be connected via a straight path.

As shown in FIGS. 1 and 4, the first to sixth distribution pipes 35
_{1-35 6} each fuel injection nozzle 44 ‥ the upper wall of the downstream end
Is provided.

Next, the operation of the above embodiment will be described.

The two actuators 29 and 43 are actuated and controlled according to the operating state of the engine, and in the low speed operating range, the left and right pipe length switching valves 38
The valves l and 38r are closed as shown by the solid line in FIG. 5, and the opening / closing valve 23 is closed as shown by the solid line in FIG. Then, the left and right branch resonance passages 22l,
The communication of 22r is cut off, and the branch resonance passages 22l and 22r for each cylinder group as the intake system and the left and right resonance chambers Cr- for each cylinder group are connected.
l, Cr-r, and left and right distribution pipes for each cylinder group 35 ₁ , 35 ₂ , 35 ₃ , 35 ₄ ,
35 _5, 35 ₆ which two systems of the intake system consisting of, that is, each three cylinders 3l ‥, resonance supercharging system 2 strains causing no intake interference leading to upstream of the intake passage Pi is composed of 3r ‥. Since this resonance supercharging system has a relatively long passage length, its natural frequency substantially matches the opening / closing cycle of each intake valve 10 in the low speed operation range of the engine, and the resonance supercharging effect is effectively exhibited. , The volumetric efficiency in the low speed operation range of the engine is improved.

The above-mentioned pipe length changeover valve 38l, in the state in which 38r is closed controlled valve 41 _{1-41 6} distributor pipe to close the valve port 39 ₁ to 39 ₆
For constituting a part of the outer wall 35 _{1-35 6,}該分pipe 35 _1-3
No sudden change in cross-sectional area occurs at 5 ₆ . Therefore,
Attenuation of pressure waves is prevented and a smooth flow of intake air is ensured, so that volumetric efficiency can be increased.

When the engine is in the medium speed operation state, the on-off valve 23 is controlled to open as shown by the chain line in Fig. 3, and the left and right resonance chambers Cr-l, Cr
-R communicates with each other to form a large volume inertial supercharging distribution chamber Ch indicated by a chain double-dashed line in FIG.
Is commonly communicated with the left and right cylinders 3l, and 3r. Then, in this state, the two resonance supercharging systems are capsulated, and the negative pressure wave generated in the engine intake stroke is reflected and inverted by the large-capacity inertial supercharging distribution chamber Ch that is substantially the open end of the atmosphere. An inertial supercharging system is constructed in which the pressure wave is propagated to the intake ports 8 of the cylinders 3l, 3r. Moreover, the negative pressure wave,
Since the length of the passage through which the positive pressure wave propagates is shortened, the intake pressure cycle coincides with the opening / closing cycle of the intake valves 10 ... During medium speed operation of the engine, and the volume efficiency in the medium speed operation range is increased.

When the engine reaches the high-speed operating state, the pipe length switching valve 38l,
The valve opening of 38r is controlled as shown by the chain line in FIG.
The middle part of the distribution pipes 35 ₁ , 35 ₃ , 35 ₅ connected to the l are valve ports 39 ₁ , 39 ₃ ,
Communicates with the pipe length switching chamber Cc through 39 _5,
The middle part of the distribution pipes 35 ₂ , 35 ₄ , 35 ₆ connected to the cylinder group Cr is the valve port 3
It communicates with the pipe length switching chamber Cc via 9 ₂ , 39 ₄ , 39 ₆ . The duct length switching chamber Cc is the distributor pipe 35 _{1-35 6} through the upstream side of communicating with the inertial supercharging distribution chamber Ch, a substantially atmospheric open end expanded inertia supercharge distributing chamber C
h'is constructed (see the chain double-dashed line in FIG. 5). Therefore, the expanded inertia supercharging distribution chamber Ch ′ and the left and right cylinder groups
Cl, Cr is the valve ports 39 ₁ to 39 is the shortest connection has been pathlength through the downstream portion than _6, and the natural frequency of the high inertial supercharging system distributing pipes 35 ₁ to 35 ₆ is formed Therefore, the intake pressure cycle can be matched with the opening / closing cycle of the intake valve 10 during high-speed operation of the engine, and the volume efficiency in the operating range can be increased. At this time, as is clear from FIG. 1, the left and right cylinder groups
Since Cl, Cr and the pipe length switching chamber Cc are connected through a substantially linear passage, the propagation speed of the negative pressure wave and the positive pressure wave increases, and the natural frequency of the inertial supercharging system is set to a value suitable for a high speed operation range. Can be increased to

FIG. 8 shows the relationship between the rotational speed and the torque of a 6-cylinder internal combustion engine to which the intake control method according to the present invention is applied. The engine has a low speed operation range (I), a medium speed operation range (II), and a high speed operation range ( II
A marked increase in torque is observed in any of the operating areas of I).

C. Effects of the Invention As described above, according to the present invention, since the pair of resonance chambers are communicated with each other by controlling the opening / closing valve to open in the medium / high speed operation range of the engine, the configuration is achieved in the low speed operation range. The inertia supercharging system can be configured in a state where the resonance supercharging system is completely canceled. Further, in the medium speed operation range, not only the pair of resonance chambers communicating with each other substantially become the open ends of the atmosphere to exert an effective inertia supercharging effect, but also in the high speed operation range, the pipe length switching valve Since the intermediate portion of each distribution pipe communicates with the pipe length switching chamber via the pipe, the pipe length switching chamber becomes a substantial open end to the atmosphere, and the pipe length is further shortened and shortened. It In this way, the resonance supercharging system is used in the low speed operation range, and the long pipe length
Since the inertial supercharging system having a short pipe length is configured, it is possible to improve the volumetric efficiency in a wide operating range of the engine.

Further, since the pressure waves in the distribution pipe are generated in opposite phases by applying the 6-cylinder internal combustion engine, these chambers can be completely opened to the atmosphere regardless of the size of the resonance chambers or the pipe length switching chambers communicating with each other. It becomes possible to function as an edge.

Further, since the resonance chamber and the distribution pipe are stored by effectively utilizing the V bank of the engine, the entire engine including the intake system can be made compact, and the inertia supercharging system having a short pipe length can be realized in the high speed operation range of the engine. When configured, since the pipe length switching chamber and the left and right cylinder groups are connected by a distribution pipe that extends in a substantially straight line, the propagation speed of the negative pressure wave and the positive pressure wave is increased to increase the natural frequency of the inertia supercharging system. It can be adapted to a value suitable for the high speed driving range. Moreover, since the resonance chamber, the distribution pipe, and the pipe length switching chamber are arranged vertically,
The right cylinder group can be formed symmetrically and their characteristics can be easily matched.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a V-type 6 cylinder internal combustion engine to which an intake control method according to the present invention is applied, and FIG. 2 is a cylinder block thereof. Of FIG. 3, FIG. 3 is an enlarged partial plan view of the III-III line of FIG. 1, FIG. 4 is an enlarged partial plan view of the IV-IV line of FIG. 1, and FIG.
6 is a sectional view taken along line VI-VI in FIG. 5, FIG. 7 is a sectional view taken along line VII-VII in FIG. 5, and FIG. 8 is a graph showing engine speed and torque. It is a graph which shows a relationship. Cc …… Pipe length switching chamber, Cl, Cr …… Cylinder group, Cr-l, Cr
-R ... Resonance chamber, C ... V bank (V space), 20
...... Throttle valve, 23 …… Open / close valve, 35 _{1 to} 35 ₆ …… Distribution pipe, 38l, 38r …… Pipe length switching valve

Claims (1)

[Claims] 1. A pair of resonance chambers (Cr-l, Cr-r) which communicate with the atmosphere through an upstream throttle valve (20) and can communicate with each other through an on-off valve (23), and an intake stroke. left but not continuous, right cylinder group (Cl, Cr) and the respective resonance chambers (Cr-l, Cr-r ) distribution pipes connected to each other (35 _1-3
5 ₆₎ and a tube length switching valve (38l, communicatively to the the V-type 6-cylinder internal combustion engine the intermediate portion in the pipe length switching chamber (Cc) of the distribution pipe through 38r) (35 ₁ to 35 ₆₎ in the housed pair of resonance chambers (Cr-l, Cr-r ) and distribution pipes (35 ₁ to 35 ₆₎ at the bottom and top of the V-bank, respectively (C), the distributor pipe (35 ₁ to 35 ₆該分pipe to the lower surface of the pipe length switching chamber which is arranged above (Cc)) of (35 ₁ to 35 ₆₎
And connects the middle part of the pipe length switching chamber (Cc)
Dispensing tube extending to the left, right cylinder group (Cl, Cr) from (35 _1-3
5 ₆ ) is formed in a substantially linear shape, and in the low speed operation region of the engine, the on-off valve (23) and the pipe length switching valve (38l, 38r) are both closed and controlled to form two resonance supercharging systems, In the medium speed operation range of the engine, the opening / closing valve (23) is controlled to open, and the pipe length switching valves (38l, 38l
r) is controlled by closing the valve so that the resonance chambers (Cr
-L, Cr-r) constitutes an inertial supercharging system with a long pipe length that is substantially the open end of the atmosphere, and the open / close valve (23) and pipe length switching valve (38l, 38r) are both and valve opening control, to configure the distribution pipe (35 ₁ to 35 ₆₎ substantially atmospheric open end to become pipe length switching chamber (Cc) communicates with the short tube length of the inertial supercharging system the middle portion of the An intake control method for a V-type 6-cylinder internal combustion engine, which is characterized.