JPH03199621A - Intake-air controller for internal combustion engine - Google Patents

Abstract

PURPOSE:To lengthen an inlet pipe and lower the total height of an engine by forming a suction system with four divisions, i.e., right and left inlet manifolds and right and left air chambers, which are formed as an integrated body together with an air-intake passage. CONSTITUTION:A suction system is formed with four divisions, i.e., right and left inlet manifolds 35a and 35b, and right and left air chambers 29 and 30, which are formed as an integrated body together with air-intake passages 31 to 34. Thus, the intake-air, which flowed into a collector 28, flows into the right or left chambers 29 or 30. At the time of a low or medium engine speed, by fully closing closing-control-valves, which are arranged on the high-engine- speed, air-intake passage (361 to 364) side, the intake-air from the air chambers 29 and 30 is sucked into the combustion chamber via both air-intake passages 31 to 34 and intake-air passages 371 to 374 for a low engine speed. In this case, since the distance between the right bank and the left bank is large enough, the air-intake passages 31 to 34 can sufficiently be lengthened. In addition, since the suction system is made up of four compact divisions and is of a flat shape, the total height of the engine can be lowered.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intake air control device for an internal combustion engine, and in detail,
In an engine that has banks on the left and right, such as a horizontally opposed engine, by providing two intake systems with different intake passage diameters and intake pipe lengths, and installing an on/off control valve on one of them, high output can be achieved over a wide range from low speeds to high speeds. Regarding what you can get.

[Conventional technology]

Conventionally, in order to obtain high output in horizontally opposed or V-type engines, each cylinder has two systems: a low/medium speed intake passage and a high speed intake passage, and a butterfly valve mechanism is installed in the high speed intake passage. Various models have been proposed in which the intake air distribution box is installed in each cylinder row and the opening/closing control is controlled by an actuator. Unexamined Japanese Patent Publication No. 63-215 as a room divided into two rooms.
The prior art shown in Japanese Patent No. 822 is known.

[Problems to be Solved by the Invention] However, the above-mentioned prior arts are all V-type engines in which the low-speed intake passage is set to have a longer pipe length than the high-speed intake passage; The longer the length, the higher the overall engine height, which can be suppressed when installed in a car with limited engine room space.

For this reason, the length of the low-speed intake passage is inevitably limited,
It is difficult to obtain a desired low-speed intake passage.

The present invention provides an intake control device for an internal combustion engine that secures the necessary intake pipe length to obtain the intake inertia effect and provides a compact intake device in a horizontally opposed engine having left and right banks. The purpose is to

[Means to solve the problem]

To achieve this object, the present invention provides an intake system for a horizontally opposed engine having left and right banks, in which the intake system is connected to a collector connected to a throttle body of an intake pipe, and for each cylinder on the left and right banks. The left and right intake manifolds are divided into four parts: left and right intake manifolds that introduce intake air into the left and right intake manifolds, and left and right air chambers that are integrally formed with an intake passage having a plurality of open ends that communicate with the left and right intake manifolds. is formed by a high-speed intake passage and a low-speed intake passage that meet on the intake port side of each cylinder formed in the left and right cylinder heads of the engine, and the high-speed intake passage of each of the left and right intake manifolds is connected to the high-speed intake passage. ,
The low-speed intake passages of the left and right intake manifolds are connected to the outside of the banks of the corresponding left and right air chambers via opening/closing control valves that are fully opened when the engine speed exceeds a set value. The intake device is formed into a flat shape by being arranged along the lower part of the left and right air chambers and connected to the opening end of the intake passage, and by disposing the collector behind the left and right intake manifolds. It is characterized by:

[For production]

In the intake control device for an internal combustion engine according to the present invention, intake air that has flowed into the collector flows into the air chamber. During low- and medium-speed rotation, by fully opening the on-off control valve located on the high-speed intake passage side, the intake air from the air chamber is routed through the intake passage corresponding to each cylinder. It is drawn into the combustion chamber of the cylinder head through the low-speed intake passage of the manifold.

In this case, since the length between the left and right banks is long, the pipe length of the low-speed intake passage can be made sufficiently long, which improves the intake efficiency due to the intake inertia effect and increases the output.

Furthermore, during high-speed rotation, by fully opening the on-off control valve, suction resistance is reduced and high output can be obtained.

Since the intake system has a compact structure divided into four sections and is flat, the overall height of the engine can be kept low.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a horizontally opposed four-cylinder engine to which a first embodiment of the present invention is applied. In the figure, symbol I is the engine, 2 and 3 are left and right cylinder blocks of the engine 1, 4 and 5 are on the left.

In the right cylinder head, 6 is an intake device, 7 is an intake pipe, 8 is an air cleaner, 9 is a resonator, 10 is an exhaust pipe, Ll is a catalyst device, and 12 is a muffler.

Ignition plugs I3 are attached to the left and right cylinder heads 4.5 of the engine I, and injectors I4 are attached to intake ports 261 to 264 corresponding to cylinders #l to #4 (not shown).
is installed. In the figure, reference numeral 15 is a crank angle sensor, 16 is a knock sensor, 17 is a cam angle sensor, 1
8 is an air flow meter, 19 is a throttle valve, 20
02 sensors respectively, and a PCV valve 2 is installed in the blow-by gas passage 2L of the cylinder block 3.
2 is installed, and an air control valve 25 is installed in a bypass passage 24 that bypasses the throttle valve 19.

The intake air taken in from the air cleaner 8 passes through the intake ports 261 to 264 from the intake device 6, and enters the combustion chambers 4a, 4 of the cylinder head 4.5 together with fuel from the injector t4.
b, 5a, 5b, and is ignited by the spark plug 13 and combusted. The exhaust gas after combustion passes through the exhaust pipe 10 from the exhaust ports 271 to 274 to the catalyst device 1.
1, and is discharged from the muffler 12 to the outside.

As shown in FIGS. 2 to 5, the intake device 6 is provided with a collector 28 on the downstream side of the throttle body 23 of the intake pipe 7, and an inlet 28a on the right side of the collector 28.
However, a left outflow port 28b and a right outflow port 28c are formed on the front side of the collector 28, respectively.

The left and right outlet ports 28b and 2+1c of the collector 28 are
It is connected to inlets 29a and 30a formed at the rear sides of the left and right air chambers 29 and 30 of the left and right banks. The left and right air chambers 29.30 are integrally formed with intake passages 31.32.33.34, as will be described later. The flanges 29b and 30b formed on the left and right outer sides of the left and right air chambers 29 and 30,
Left openings 29c, 29cl, right openings 3De,
30d is formed.

Left and right cylinder heads 4 and 5 on the left and right bank sides
A left (right) intake manifold 35a (35bHL,
#2 intake passage 352 and #4 intake passage 354 (#4) communicate with intake ports 262 and 284 (2B+ and 263) in the left (right) cylinder head 4 (5), respectively.
1 intake passage 35. and #3 intake passage 35. ) are integrally formed.

#2 cylinder (#1. #3. #4 cylinder) intake passage 352
(351, 3FN, 354) are the high speed intake passage 362 (3B+, 383, 364) and the low speed intake passage 372 (371, 373, 374) are #2
Intake port 2 corresponding to cylinder (#1, #3, #4 cylinder)
6□ (26,.

263, 264) opening 38□ (3g
, , , 383°384) are bifurcated. The inlet ports 392°394 (391393) of the high-speed intake passages 362, 364 (361, 363) of the #2 and 84 cylinders (#1 and #3 cylinders) are integrally connected with a flange 40a (40b). Formed, #2. #4
Low-speed intake passages 37□, 374 for cylinders (#1.#3)
(371, 373) inlets 412, 414
(411, 413) are each independently open.

The flange 40a (40b) of the left (right) intake manifold 35a (35b) is connected to the left (right) air chamber 29 (
30), and the left (right) intake manifold 35a (35b) extends downward from the left (right) air chamber 29 (30) and connects the left (right) cylinder. The head 4 <5> is arranged at the shortest distance with a short pipe length. Then, the left (right) intake manifold 35a (35b) is connected to the left (right) air chamber 29 (35b).
#2. #4 (#1.#
3) low speed intake passage 37°, 374 (371,
373) is the left (right) intake manifold 35a (35
b) is formed.

#1. The intake passages 31 and 32 that communicate with the #2 low-speed intake passage 3L and 37□ are connected to the left and right air chambers 3.
It extends from above 0°29 to the opposite left and right banks, and turns 180 degrees to create an air chamber 30°2 with one stone on the left.
The intake passage 33, which has openings 31a and 32a open below the #3 low-speed intake passage 373, extends from above the left air chamber 29 toward the right air chamber 30, and extends downward from the left air chamber 29 toward the right air chamber 30. After cooling, an opening 33a opens below the right air chamber 30, and #4 low-speed heat absorption passage 37
4, the intake passage 34 extends from above the right air chamber 30 toward the left air chamber 29, has an opening 34a below the left air chamber 29, and connects the left and right air chambers 29. 30 is integrally formed with each intake passage 31-34. Each opening 31a to 34a of each intake passage 31 to 34 and the left and right intake manifolds 35
Low-speed intake passages 362 and 364 of a and 35b
, 36+, 363 each inlet 412.414°41
1 and 413 are connected through a connecting pipe 50.

Therefore, in the configuration according to the present invention, the left and right air chambers 2
9.30 is on the left of horizontally opposed engine l.

Since it is separated toward the right bank side and integrally formed with each intake passage 31 to 34, the pipe length of each intake passage 31 to 34 can be increased, and each number of the left and right intake manifolds 35a and 85b is 1 to #4 high-speed intake passages 36. ~364 can be shortened.

Furthermore, since the intake passage 6 is formed in a flat shape, the overall height of the engine 1 can be kept low.

Left opening 29c of left and right air chambers 29.30,
29d1 right openings 30c, 30d are provided with open/close control valves 46, 464 which are opened and closed by left and right actuators 42.43 via link mechanisms 44.45, as shown in FIG. The negative pressure chambers (not shown) of the left and right actuators 42, 43 are connected to the negative pressure tanks 47 that store the negative pressure in the intake pipes, which communicate with the negative pressure outlets 29e and 30e of the left and right air chambers 29, 30. The solenoid valve 49 is switched by a switching signal from the control unit 48 so as to introduce negative pressure or atmospheric pressure.

The control unit 48 is manually supplied with a signal from the crank angle sensor 15 that detects the engine rotation speed, and when the engine rotation speed is lower than a predetermined value and is rotating at low or medium speeds, the solenoid valve 49 is activated by the signal from the control unit 48. The solenoid 49a is energized, and the valve body 49b closes the atmosphere port 49c and opens the negative pressure intake port 49d. The negative pressure from the negative pressure tank 47 is transferred to the negative pressure intake port 49d.
Negative pressure is introduced into the negative pressure chambers of the actuators 42 and 43 through the actuators 42 and 43, and the on-off control valves 46° to 464 are closed.

Also, at high speeds when the engine speed is higher than the specified value,
The solenoid valve 4 is activated by a signal from the control unit 48.
The negative pressure chambers of the actuators 42 and 43 are communicated with the atmosphere through the on-off control valves 46 and 9. ~464 is opened.

The operation of the embodiment configured as described above will be explained based on the intake system diagram shown in FIG.

First, when the crank angle sensor 15 detects that the engine L is rotating at a low or medium speed below a predetermined rotation speed, the signal from the crank angle sensor 15 is manually input to the control unit 48; The solenoid 49a of the solenoid valve 49 is energized, the negative pressure tank 47 and the negative pressure chambers of the left and right actuators 42, 43 are communicated, and the opening/closing control valves 46° to 464 are closed.

The intake air that has flowed into the collector 28 from the air cleaner 8 flows into the right air chamber 30, is reversed by 1.80 degrees by the intake passage 31 located above and forward of the right air chamber 30, and is then transferred to the right intake manifold 35b. It flows into the combustion chamber 5a of the right cylinder head 5 through the #1 low-speed intake passage 371, further passes under the intake device 6 by the intake passage 34 located below and rearward of the right air chamber 30, and then passes under the intake device 6, and then passes under the intake device 6 through the intake passage 34 located below and rearward of the right air chamber 30. It flows into the combustion chamber 4b of the left cylinder head 4 through the #4 low-speed intake passage 374 of the intake manifold 35a.

In addition, the intake air flowing into the left air chamber 29 is reversed 180 degrees by the intake passage 32 located above and in front of the left air chamber 29, and flows through the #2 low-speed intake passage 37□ of the left intake manifold 35a. It flows into the combustion chamber 4a of the left cylinder head 4 through the air chamber 29, and further into the left air chamber 29.
The intake passage 33 located above and rearward is directed toward the right air chamber 30, descends, passes below the intake device 6, and is directed to the #3 low-speed intake passage 37 of the right intake manifold 35b. through the combustion chamber 5b of the right cylinder head 5
flows into.

Next, when the engine l rotates at a high speed higher than a predetermined rotation speed, the solenoid valve 4
The energization of the solenoid 49a of 9 is released, and the negative pressure tank 4
7 and the negative pressure chambers of the left and right actuators 42 and 43 are cut off, the negative pressure chambers of the left and right actuators 42 and 43 are opened to the atmosphere, and the on-off control valves 461 to 464 are opened.

The intake air that has flowed into the collector 28 from the air cleaner 8 flows into the air chambers 30 (f), and most of it flows from the right air chamber 30 to each #1. ．． A portion flows into the #3 high-speed intake passage 361.36, and a portion passes through the intake passage 31 to the #1 low-speed intake passage 371. The air flows through the intake passage 34 to the #4 low-speed intake passage 374. Most of the intake air flowing into the left air chamber 29 is in each # of the left intake manifold 35a.
2 Flows into #4 high-speed intake passage 362, 364, and a portion passes through intake passage 32 to #2 low-speed intake passage 37□
, flows through the intake passage 33 to the #3 low-speed intake passage 373.

Therefore, during low and medium speed rotations, intake air is taken in through the long intake passage, so that the intake efficiency is improved due to the intake inertia effect, and the output is improved during low and medium speed rotations. Further, during high-speed rotation, the intake air is mainly taken in through the short intake passage, and a portion is taken in through the long intake passage, so that intake resistance is reduced and high output can be ensured.

6 to 8 are a top view and a partially cutaway side view of an intake device 6 showing a second embodiment of the present invention.

In this embodiment, the left and right air chambers 293
0 extends from the left and right air chambers 29 and 30 toward the opposite right and left bank right and left air chambers 30°29, and turns 180 degrees to form the left and right air chambers 29.
．． An intake passage 32a opened along the lower part of 30,
Intake passages 32b are formed integrally with 34a, 31a, and 33a, and are located at the front and rear of the left and right outer sides of the left and right air chambers 29.30, and open downward.
, 34b, 31b, and 33b are formed.

The intake passages 32a and 34a have openings 382 and 3g.
, #'2. of the left intake manifold 35a which branches into two forks from the left intake manifold 35a. #4 low speed intake passage 372.374
The intake passages 32b and 34b are connected to #2. They are connected to #4 high-speed intake passages 362 and 364, respectively.

The intake passages 31a, 33a have openings 38. , 38
．． Intake manifold 35 which branches into three-pronged shapes from
#1 of a. #3 low speed intake passage 37. , 373 via connecting pipes 50, and the intake passage 3
1b 33b is #1. They are respectively connected to #3 high speed intake passage 36°363.

And #2. Opening/closing control valves 462, 464 are disposed in the #4 high-speed intake passage 362, 364, and the link mechanism 4
#1 #3
High-speed intake passage 36. , 363 also has an on-off control valve 4B.
, , 463 are arranged and connected to the actuator 43 via the link mechanism 45. The actuation system of the left and right actuators 42 and 43 is the fourth embodiment showing the first embodiment.
It is similar to the one shown in the figure.

Therefore, in the second embodiment as well, opening/closing 1. Both valves46. ~ Low when 464 is closed
In the medium-speed co-rotation 1 Samurai, air is taken in by a long pipe length, and the suction efficiency is improved due to the intake inertia effect during low and medium-speed co-rotation, and the output direction -L is obtained. Since the air is mainly inhaled through a short intake passage and a portion is inhaled through a long intake passage, suction resistance is reduced and high output can be obtained.

Note that in both embodiments, it goes without saying that the diameter of the short high-speed intake passage may be larger than the diameter of the long low-speed intake passage.

〔Effect of the invention〕

As explained above, the intake control device for an internal combustion engine according to the present invention is an intake system for a horizontally opposed engine having left and right banks, in which the intake system is connected to a collector connected to a throttle body of an intake pipe and a bank on the left and right sides. It is divided into four parts: left and right intake manifolds that introduce intake air into each cylinder on the side, and left and right air chambers that are integrally formed with an intake passage that has multiple open ends that communicate with the left and right intake manifolds. , the left and right intake manifolds are formed by a high-speed intake passage and a low-speed intake passage that meet on the intake hot side of each cylinder formed in the left and right cylinder heads of the engine, and the left and right intake manifolds each have a high-speed intake passage the intake passage,
The left and right air chambers are connected to the outside of the banks of the corresponding left and right air chambers via on-off control valves that are fully opened when the engine speed exceeds a set value, and the low-speed intake passages of the left and right intake manifolds are connected to the left and right air chambers. The intake device is arranged along the lower part of the chamber, connected to the open end of the intake passage, and the collector is arranged behind the left and right intake manifolds, making the intake device flat. During engine rotation, intake air is drawn through a long intake passage, which improves intake efficiency due to the intake inertia effect and increases output. Also, when the engine is running at high speed, the opening/closing control valve is fully open, and the main intake air is drawn through a short intake passage. Since the air is inhaled through the passage and a portion is also inhaled through the long intake passage, intake resistance is reduced, intake efficiency is improved, and high output can be ensured.

Furthermore, the left and right air chambers are spaced apart in the left and right direction, making it possible to lengthen the intake passage formed integrally with the left and right air chambers, which reduces the intake inertia effect during low and medium speed rotation. A sufficient pipe length can be secured.

Furthermore, since the intake device is formed in a flat shape, the overall height of the engine can be kept low in conjunction with a horizontally opposed engine, making it possible to install it in a narrow engine room of a vehicle.

In addition, since the adjacent low-speed intake passages of the left and right intake manifolds are connected to the open ends of the intake pipes that communicate with the air chambers of the opposite bank, there is no intake interference during the intake stroke, and this eliminates intake air interference in the low- and medium-speed rotation range. A sufficient volumetric efficiency can be obtained.

Furthermore, the adjacent low-speed intake passages of the left and right intake manifolds are connected to the open ends of the intake pipes that communicate with the respective left and right air chambers, simplifying the configuration and facilitating the manufacture of the intake system. become.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a four-cylinder water-to-air engine to which a first embodiment of the present invention is applied, FIG. 2 is a top view of an intake system showing the main parts of FIG. 1, and FIG. FIG. 2 is a partially sectional side view, FIG. 4 is a configuration diagram showing the operating mechanism of the on-off control valve, FIG. 5 is a diagram showing the intake system according to the present invention, and FIG. 6 is a diagram showing the second embodiment. FIG. 7 is a top view of the intake device, FIG. 7 is a partially cutaway side view of FIG. 6, and FIG. 8 is a diagram showing an intake system according to a second embodiment. I...Engine body, 4.5...Left and right cylinder heads, 6...Intake device, 28...Collector, 29
．． 30...Left 1 right air chamber, 31-34.31
a ~34a. 31b to 34b... Intake passage, 35a, 35b.
...Left and right intake manifolds, 36. ~36. ...
High speed intake passage, 371-374...Low speed intake passage,
42.43...Left and right actuators, 461-4
64...Opening/closing control valve.

Claims (3)

[Claims] (1) In an intake system for a horizontally opposed engine having banks on the left and right, the intake system is connected to a collector connected to the throttle body of the intake pipe, and a left and right side that introduces intake air to each cylinder on the left and right banks. The left and right air chambers are formed into four parts: an intake manifold, and left and right air chambers that are integrally formed with an intake passage having a plurality of open ends that communicate with the left and right intake manifolds, and the left and right intake manifolds are divided into four parts. It is formed by a high-speed intake passage and a low-speed intake passage that meet on the intake port side of each cylinder formed in the cylinder head. is connected to the outside of the corresponding bank of the left and right air chambers through opening/closing control valves that are fully opened when the temperature exceeds The internal combustion engine is characterized in that the intake device is formed into a flat shape by being arranged along the intake manifold and connected to the open end of the intake passage, and by disposing the collector behind the left and right intake manifolds. intake control device. (2) The internal combustion engine according to claim 1, wherein the adjacent low-speed intake passages of the left and right intake manifolds are connected to open ends of the intake pipes communicating with the air chambers of the opposite banks. Engine intake control device. (3) The internal combustion engine according to claim (1), wherein the adjacent low-speed intake passages of the left and right intake manifolds are connected to open ends of the intake pipes communicating with the respective left and right air chambers. intake control device.