JPH03199622A - 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 an air-intaking device with a collector and right and left inlet manifolds, which are formed as an integrated body together with both right and left air chambers and air-intake passages for a low engine speed. CONSTITUTION:An air-intakeing device is formed with a collector 28 and right and left inlet manifolds 35a and 35b, which are formed as an integrated body together with right and left air chambers 29 and 30 and air-intake passages 371 to 374 for a low engine speed. At the time of a low or medium engine speed, by fully closing closing-control-valves 461 to 464, which are arranged at right and left run-off ports 281 to 284 of the collector 28, the intake air, which flowed into the collector 28, is sucked into a combustion chamber from air-intake passages 31 to 34, which are situated under the collector 28, via air-intake passages 371 to 374 for the 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 air-intaking device is formed with three compact divisions and is of a flat shape, the total height of the engine can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake 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 a horizontally opposed or V-type engine, each cylinder had two systems: a low/medium speed intake passage and a high speed intake passage, and a butterfly valve mechanism was installed in the high speed intake passage. Various systems 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. 63-21582, which has two separate rooms.
The prior art shown in Publication No. 2 is known.

[Problem to be solved by the invention]

However, the above-mentioned prior arts are all type II engines, and the low-speed intake passage is set to have a longer pipe length than the high-speed intake passage, but if the low-speed intake passage is lengthened, the overall height of the engine increases, and the engine length increases. When installed in a car with limited interior space, the overall height of the engine can be reduced.

Therefore, the length of the low-speed intake passage is inevitably limited, making it difficult to obtain a desired low-speed intake passage.

An object of the present invention is to provide an intake control device for an internal combustion engine in which a necessary intake pipe length is secured to obtain an intake inertia effect in a horizontally opposed engine having left and right banks, and a compact intake device is obtained. 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 formed on the left and right cylinder heads of the engine, with an inlet at the rear of the collector and outlet ports at the left and right sides of the collector. The left and right air chambers, which are connected to the high-speed intake passages that merge on the intake boat side of each cylinder, are integrally formed with the low-speed intake passages, and the low-speed intake passages of the left and right intake manifolds are connected to each other. , is arranged along the lower part of the left and right intake chambers, and an intake passage is formed below the collector that communicates with the left and right low-speed intake passages, respectively, and the engine rotation speed is set at the left and right outlet of the collector. We have installed an on-off control valve that opens fully when the value is exceeded.
The intake manifold is disposed on the left and right sides of the collector, and the intake device is formed into a flat shape.

[For production]

In the intake air control device for an internal combustion engine according to the present invention, during low to medium speed rotation, the intake air flowing into the collector is fully opened by fully opening the on-off control valves disposed at the left and right outlet ports of the collector. The air is drawn into the combustion chamber of the cylinder head from the intake passage below the collector through the low-speed intake passage corresponding to each cylinder.

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 simultaneous rotation, by fully opening the on-off control valves, air is drawn from the left and right outlets of the collector, through the left and right air chambers, through a short high-speed intake passage, and into the combustion chamber of the cylinder head. Inhalation resistance is reduced and higher output can be obtained.

Since the intake system has a compact three-part structure 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. .5 indicates the left and right cylinder heads, 6 indicates an intake device, 7 indicates an intake pipe, 8 indicates an air cleaner, 9 indicates a resonator, 10 indicates an exhaust pipe, 11 indicates a catalyst device, and 12 indicates a muffler.

Ignition plugs 13 are attached to the left and right cylinder heads 4.5 of the engine l, and intake ports 26.5 corresponding to cylinders #1 to #4 (not shown) are installed. to 264, the injector 14
or 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 air flow meter, 19 is Slowa I Leharbe, 2
0 indicates the 02 sensor, a PCV valve 22 is installed in the blow-by gas passage 21 from the cylinder block 3, and an air control valve 25 is installed in the bypass passage 24 that bypasses the throttle valve 19. .

The intake air taken in from the air cleaner 8 is transferred from the intake device 6 to the intake boat 26. ~264 and the combustion chambers 4a, 4 of the cylinder heads 4, 5 together with the fuel from the injector 14.
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 28 on the rear side of the collector 28.
a is the left (right) outlet 2 on the left (right) side of the collector 28.
82, 284 (281, 283) are formed, respectively, and a left (right) opening 32a is provided below.

34a (31a, 33a) at the open end of the left (right) intake passage 32.34 (31, 33) is the collector 2.
It is formed integrally with 8.

Left and right cylinder heads on left and right bank sides 4.5
The left (right) high-speed intake passages 362, 364 (36
1.

36,) and low speed intake passages 372, 374 (37
1, 373) means #2. #4 cylinder (#1. #3 cylinder)
Intake ports 26□, 264 (281,
Openings 38□, 3L (381
, 383), with trifurcated branches formed from #2. High-speed intake passages 362 and 364 for #4 cylinder (#1 and #3 cylinder)
(361, 363) is the left (right) air chamber 2
9 (30) in communication with the outside of #2. #4
(#1..#3) High-speed intake passage 3B2, 3L
(361, 363) is air chamber 2 of k (right)
9 (30) of 92. It communicates with the air chambers 29a, 29b (30a, 30b) of #4 (#1.#3), and #2. #4 (#1.#3) air chamber 29a2
9b (30a, 30b) inlet 3B2. , 36
4. (361,, 363,) is the left side of the collector 28 (
282, 284 (28°, 284). #2. The inlet port 37□□374- (371-, 37:+-) of the low-speed intake passage 372.374 (3L, 373) of #4 (#1.#3) is
Openings 32a, 3 of the left (right) intake passage 32.34 (31, 33) integrally formed below the collector 28
4a (31a 33a), and the low-speed intake passages 37, ~374 are connected to the high-speed intake passages 361-364.
It has been longer.

Therefore, in the configuration according to the present invention, the left and right air chambers 29, 30 in the left and right intake manifolds 35a and 35b are located on the left and right bank sides of the horizontally opposed engine l with the collector 28 in the center. spaced to the left (
The high-speed intake passages 36□, 384 (381, 363) extend from the outside of the air chamber 29 (30) on the right), and the air chamber 29 on the left (right) extends from below the collector 28.
(30) Lower left (right) intake passage 3234 (31,
33) to the low speed intake passages 37□, 374 (371,
373> and connect it to the left (right) high-speed intake passage 362.
, 364 (361, 383) and the left (right) low speed intake passage 372, 374 (371, 373) are the left (
right) openings 382, 384 (381, 383)
Since they are integrally formed so as to merge at , the pipe lengths of the low-speed intake passages 371 to 374 can be lengthened, and the high-speed intake passages 361 to 364 can be shortened.

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

The left and right outlets 282 and 284 of the collector 28 (
281.

283), as shown in FIGS. 2, 3, and 4, the link 43a, the control valve shaft 44a, the link rod 45. Opening/closing control valves 461 to 464 that open and close via a control valve shaft 44b are disposed, and a negative pressure chamber (not shown) of the actuator 42 stores negative pressure in the intake pipe communicating with the negative pressure outlet 28e of the collector 28. A solenoid valve 49 that is switched by a switching signal from a control unit 48 is connected to introduce negative pressure or atmospheric pressure from a negative pressure tank 47 .

The control unit 48 is manually inputted 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 (4), the signal from the control unit 48 is input to the control unit 48. The solenoid 49a of the solenoid valve 49 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 49.
Negative pressure is introduced into the negative pressure chamber of the actuator 42 through d, and the left (right) open/close control valves 462, 464 (461
, 483).

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.
9 communicates the negative pressure chamber of the actuator 42, 43 with the atmosphere, and the left (right) opening/closing control valve 462°464 (4)
, 4B3).

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 1 is rotating at 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 chamber of the actuator 42 are communicated, and the left and right open/close control valves 46. ~464 is closed.

The intake air flowing into the collector 28 from the air cleaner 8 is passed from below the collector 28 through the intake passages 31 to 34 to the respective low-speed intake passages 37. ~Left (right) after 374
Combustion chambers 4a, 4b (5a) of cylinder head 4 (5) of
, 5b).

Next, when the engine 1 rotates at a high speed higher than a predetermined rotation speed, the solenoid valve 4 is activated by an output signal from the control unit 48 based on the signal from the crank angle sensor 15.
The energization of the solenoid 49a of 9 is released, and the negative pressure tank 4
7 and the negative pressure chamber of the actuator 42 is cut off,
The negative pressure chamber of the actuator 42 is opened to the atmosphere, and the left and right open/close control valves 46□ to 464 are opened.

The intake air flowing into the collector 28 from the air cleaner 8 is transferred to #2 of the left (right) air chamber 29 (30) in the left (right) intake manifold 35a (35b). #4(
#1. #3) air chambers 29a, 29b (30
a30b), most of which flows into #2. #4 (#1.
#3) air chambers 29a, 29b (30a
, 30b) to the left (right) high-speed intake passage 362
, 384 (361.

363), and some of it flows into the left (right) intake passage 32°3.
4 (31, 33) to low speed intake passages 372, 37
4 (371.

373) into the combustion chambers 4a, 4b (5a 5b) of the left (right) cylinder head 4 (5).

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. Furthermore, during high-speed rotation, the intake air is mainly taken in through the short intake passage, and some of it is taken in through the long intake passage, so that the intake resistance is reduced and high output can be ensured.

In addition, as another example, the left (right) intake chamber 29
(30) to #2. The air chambers 29a, 29b (30a, 30b) of #4 (#1.13) are not separated into a single chamber as shown in the system diagram of Fig. 6, and the left (right) open/close control valve 46a ( 46b) and one each may be provided.

Further, in the embodiment, 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. Formed by left and right intake manifolds that introduce intake air into each cylinder on the side,
An inlet is formed on the rear side of the collector, and an outlet is formed on the left and right sides, and the left and right intake manifolds communicate with the high-speed intake passage that joins on the intake boat side of each cylinder formed in the left and right cylinder heads of the engine. The formed left and right air chambers and low-speed intake passages are integrally formed, and the low-speed intake passages of the left and right intake manifolds are arranged along the lower part of the left and right intake chambers, and below the collector. An intake passage is formed that communicates with the left and right low-speed intake passages, and open/close control valves that are fully opened when the engine speed exceeds a set value are installed at the left and right outlets of the collector. Since the intake manifold is installed and the intake device is formed into a flat shape, when the engine is rotating at low to medium speeds, intake air is taken in through a long intake passage, improving intake efficiency due to the intake inertia effect. When the output increases and the engine rotates at high speeds, the on-off control valve opens fully, and the main intake air is taken in through the short intake passage, while some is taken in through the long intake passage, reducing intake resistance. This improves suction efficiency and ensures high output.

Furthermore, the left and right air chambers are spaced apart in the left-right direction, and the low-speed intake passage is connected to the intake passage formed below the central collector, making it possible to lengthen the intake passage. , it is possible to secure a pipe length that is sufficient to obtain the intake inertia effect during low and medium speed rotation.

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

In addition, since the intake manifold is integrally formed,
Since the configuration is simplified, manufacturing of the intake device becomes easier.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a horizontally opposed four-cylinder engine according to the present invention, Fig. 2 is a top view of the intake system showing the main parts of Fig. 1, and Fig. 3 is a partially sectional side view of Fig. 2. , FIG. 4 is a block diagram showing the operating mechanism of the opening/closing control valve, FIG. 5 is a diagram showing an intake system according to the present invention, and FIG. 6 is a diagram showing an intake system of another embodiment. l... Engine body, 4, 5... Left and right cylinder heads, 6... Intake system, 28... Collector, 29
．． 30...Left and right air chambers, 31-34...
Intake passage, 35a35b...Intake manifold, 36
1 ~ 364 ・・High speed intake passage, 37, ~ 374・
...Low speed intake passage, 42. Actuator, 46. ~
464...Opening/closing control valve.

Claims (1)

[Claims] In an intake system for a horizontally opposed engine having left and right banks, the intake system includes a collector connected to a throttle body of an intake pipe, and intake air introduced into each cylinder on the left and right banks. The left and right intake manifolds are formed with left and right intake manifolds, and an inlet is formed on the rear side of the collector, and outlet ports are formed on the left and right sides of the collector.The left and right intake manifolds are connected to each cylinder formed in the left and right cylinder heads of the engine. The left and right air chambers, which are connected to the high-speed intake passages that merge on the intake port side, are integrally formed with the low-speed intake passage, and the low-speed intake passages of the left and right intake manifolds are connected to the left and right intake manifolds. An intake passage is arranged along the lower part of the intake chamber, and below the collector, an intake passage is formed which communicates with the left and right low-speed intake passages, and the left and right outlet of the collector is provided with an intake passage that communicates with the left and right low-speed intake passages. An intake control device for an internal combustion engine, characterized in that an opening/closing control valve that is fully open at times is provided, the intake manifolds are provided on the left and right sides of the collector, and the intake device is formed into a flat shape.