JPH03199623A - 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 a collector, an air-intake passage, and an inlet manifold, which is formed as an integrated body together with middle-and right-and-left-air chambers. CONSTITUTION:A suction system is formed with a collector 28, air-intake passages 361 to 364 for a high engine speed, air-intake passages 371 to 374 for a low engine speed, and an inlet manifold 35, which is formed as an integrated body together with a middle air chamber 31 and right and left air chambers 29 and 30. Here, by fully closing closing-control-valves, which are arranged at run-off ports 28b and 28c situated at the right and left sides of the collector 28, the intake-air, which flowed into the collector 28, is sucked into a combustion chamber from the middle air chamber 31 via the air-intake passages 371 to 374 for the low engine speed. In this case, since the distance between the right bank the left bank is large enough, the length of the air-intake passages 371 to 374 for the low engine speed can sufficiently be lengthened. In addition, since the suction system is formed with two 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. vI
Concerning something that has been made possible.

[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 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. 63-215822 as a dual-purpose room
The prior art shown in each of the above publications is known.

[Problem to be solved by the invention]

However, the above-mentioned prior arts are all V-type 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.

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.

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]

In order to achieve this objective, 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 each side of the left and right banks. It is formed by left and right intake manifolds that introduce intake air into each cylinder, and outlet ports are formed at the front left, right and center of the collector, and the intake manifolds are formed on the left and right cylinder heads of the engine. The high-speed intake passage, the low-speed intake passage, and the central air chamber and left side, which meet on the intake port side of each cylinder,
It is formed integrally with the right air chamber, and the low-speed intake passages are formed in communication with each other below the center air chamber, and an inlet is formed on the rear side of the center air chamber, and the left and right air chambers are formed integrally with each other. The left and right high-speed intake passages are formed in communication with each other on the outside of the air chamber, and inflow ports are formed at the rear sides of the left and right air chambers, and the engine rotation speed is set at the left and right outflow ports of the collector. The intake device is characterized in that an opening/closing control valve is provided that opens fully when the intake manifold is exceeded, the collector is provided behind the intake manifold, 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 on-off control valves disposed at the left and right outlets of the collector are fully opened, so that the intake air flowing into the collector is The air is drawn into the combustion chamber of the cylinder head from the central air chamber through the low-speed intake passages 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 movement due to the intake inertia effect and increases the output.

Furthermore, when rotating at high speeds, by fully opening the on-off control valve, air is drawn from the left and right air chambers through short high-speed intake passages into the combustion chamber of the cylinder head, reducing intake resistance and achieving high output. be able to.

Since the intake system has a compact two-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. 4.5 is 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, 11 is a catalyst device, and 12 is a muffler.

Ignition plugs 13 are attached to the left and right cylinder heads 4.5 of the engine 1, and injectors 14 are attached to intake ports 261 to 264 corresponding to cylinders #1 to #4 (not shown).
is installed. In the figure, reference numeral 15 is a crank angle sensor, i6 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 the blow-by gas passage 21 from the cylinder block 3 includes the PCV valve 2.
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 is transferred from the intake device 6 to the intake boat 26. ~264 and the combustion chamber 4a, 4 of the cylinder head 4.5 together with the fuel from the injector I4.
b, 5a, and 5b, and is ignited by the spark plug 13 and combusts. And the exhaust nozzle after combustion is the exhaust boat 27. ~274 through the exhaust pipe 10 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 ear side of the collector 28.
A left outflow port 28h, a right outflow port 28c, and a center outflow port 28d are formed on the front side of the collector 28, respectively. The left and right outlets 28b and 28c and the center outlet 28d of the collector 28 are inlets formed on the rear side of the left and right air chambers 29, 30 and the center air chamber 31 of the left and right banks in the intake manifold 35. 29a,
30a and 31a, respectively. The left and right air chambers 29, 30 and the central air chamber 31 are, as described later, high-speed intake passages 3B, ,
3B. , 383.3B, and low speed intake passage 37
．． , 37□, 37. , 374.

Left ear cylinder head 4 on the left one stone bank side,
The left (right) high-speed intake passages 362, 3L (
36363) and low speed intake passages 372, 374 (
371, 373) are intake ports 262, 264 (2B,
, 283) are connected to the openings 382 and 384 (3L
, 383), with bifurcated branches formed from #2. #
4-cylinder (#1, 33 cylinder) high-speed intake passage 36°,
364 (3B, 363) is formed in communication with the outside of the left air chamber 29 (right air chamber 30), and is connected to the low speed intake passage 37 of the #2 and 94 cylinders (#1° and #3).
□ 374 (371, 373) are formed in communication below the central air chamber 31, and are connected to the low-speed intake passage 37.
~374 is longer than the high speed intake passage 3B and ~364.

Therefore, in the configuration according to the invention, the intake manifold 35
The left and right air chambers 29.30 are separated toward the left and right bank sides of the horizontally opposed engine 1, and the high-speed intake passage 362.364 is connected from the outside of the left (right) air chamber 29 (30). (361, 363) extend from below the central air chamber 31 to below the left (ear) air chamber 29 (30), and a low speed intake passage 37□.
374 (371, 373) are extended to form left (right) high speed intake passages 362, 364 (361, 363).
) and left (right) low speed intake passage 37□, 374 (3
737,) and the left (right) openings 382, 384
(3g, 383), so the length of the low-speed intake passages 37, ~374 can be lengthened, and the high-speed intake passages 36, ~364 can be lengthened.
can be shortened.

Moreover, since the intake manifold 35 is formed in a flat shape, the overall height of the engine 1 can be kept low.

As shown in FIG. 4, left and right actuators 424 are connected to the left and right outflows D28b and 28c of the collector 28, respectively.
3, opening/closing control valves 46a and 46b which are opened and closed via link mechanisms 44 and 45 are provided, and the negative pressure chambers (not shown) of the left and right actuators 42 and 43 are connected to the negative pressure outlet 28e of the collector 28. The control unit 48 is connected to a negative pressure tank 47 which provides an intake pipe negative pressure that communicates with the control unit 48.
They are communicated so as to introduce negative pressure or atmospheric pressure via a solenoid valve 49 which is switched by a switching signal.

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 speed, the solenoid valve is activated by the signal from the control unit 48. 49 solenoid 49a is energized, and the valve body 49b closes the atmosphere port 49c, and the negative pressure intake port 49d opens. 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 chamber of the actuator 42, 43 through the opening/closing control valve 46a.

Close 46b.

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 actuators 9, and the on-off control valves 4Ba and 46b are 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 t 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 open/close control valve 46a46b is closed.

The intake air flowing into the collector 28 from the air cleaner 8 flows into the central air chamber 31, and then flows into the central air chamber 31.
Each low-speed intake passage 371 to 374 from below 1
Combustion chamber 4 of left (right) cylinder head 4 (5) through
a, 4b (5a, 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 chambers of the left and right actuators 4243 are cut off, the negative pressure chambers of the left and right actuators 42.43 are opened to the atmosphere, and the on-off control valves 46a and 46b are opened.

The intake air flowing into the collector 28 from the air cleaner 8 flows into the left (right) air chamber 29 (30), and most of the air flows from the 7iE (right) air chamber 29 (30) to the left (right) air chamber 29 (30).
right) high-speed intake passage 36□, 3134 (381
, 363), and a portion flows into the combustion chambers 4a, 4b (
5a, 5b) flows into.

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.

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 with left and right intake manifolds that introduce intake air into each cylinder on the side,
Outflow ports are formed on the front left, right and center of the collector, and the intake manifold has an intake passage for high speeds and a low speed intake passage that meet at the intake port side of each cylinder formed in the left cylinder head of the engine. The intake passage, the central air chamber, and the left and right air chambers are integrally formed, with low-speed intake passages communicating with each other below the central air chamber, and an inlet on the rear side of the central air chamber. In addition, left and right high-speed intake passages are formed on the outside of the right air chamber, respectively, and inflow ports are formed on the rear sides of the left and right air chambers, and engine rotation ports are formed in the left and right outlet ports of the collector. Opening/closing that becomes fully open when the number exceeds a set value 1. Both valves are installed, the collector is placed behind the intake manifold, and the intake device is formed into a flat shape, so that when the engine rotates at low to medium speeds, intake air is drawn in through a long intake passage. Therefore, the intake efficiency is improved due to the intake inertia effect, increasing the output, and when the engine rotates at high speed,
The on-off control valve is fully open, 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, improving intake efficiency, and ensuring high output. be able to.

Furthermore, the left and right air chambers are spaced apart from each other in the left and right direction, and the low-speed intake passage extends from the central air chamber, making it possible to lengthen the intake passage. It is possible to ensure a pipe length that provides sufficient intake inertia effect during 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, and FIG. 5 is a diagram showing the intake system according to the present invention. l...Engine body, 4.5...Left and right cylinder heads, 6...Intake device, 28...Collector, 29.
30. Left and right air chambers, 31.. Center air chamber, 361-364.. High-speed intake passage, 37□-
374...Low speed intake passage, 42.43...Left,
Right actuator, 46a, 46b...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 intake manifold is formed by left and right intake manifolds, and outlet ports are formed at the front left, right and center of the collector, and the intake manifold is formed on the intake port side of each cylinder formed in the left and right cylinder heads of the engine. A high-speed intake passage, a low-speed intake passage, and a central air chamber and left and right air chambers are integrally formed, and the low-speed intake passages are formed in communication with each other below the central air chamber. At the same time, an inlet is formed on the rear side of the central air chamber, and the left and right high-speed intake passages are formed in communication with the outsides of the left and right air chambers, respectively, and at the rear of the left and right air chambers. An inlet is formed on the side, and open/close control valves that are fully opened when the engine speed exceeds a set value are arranged at the left and right outlets of the collector, and the collector is arranged behind the intake manifold. An intake control device for an internal combustion engine, characterized in that the intake device is formed into a flat shape.