JPH1193788A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device for an internal combustion engine with excellent manufacturing ability capable of making itself smaller and lighter, simplifying an intake swirl control valve controller and improving the power output and exhaust gas emission control of the engine. SOLUTION: For an intake manifold 1, independent two-system intake ducts 2A-5A, 2B-5B provided for cylinders #1-#4, collectors 6, 7 to collect the suction ducts for every system, a cylinder head side mount 12 on which the independent side openings 8A-11A, 8B-11B of the suction ducts are formed and an air cleaner side mount 13 on which the openings 6A, 7A of the collectors for the intake ducts are formed are integrally molded with casting. At one end of a throttle chamber, two downstream openings communicated with the openings of the intake manifold collectors are formed. At the other end, one upstream opening with which the air cleaner side intake passage is communicated is formed. An intake swirl control valve and an intake throttle valve are installed at one opening and at one upstream opening, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake device for an internal combustion engine, and more particularly to a structure of an intake manifold and a throttle chamber.

[0002]

2. Description of the Related Art Conventionally, a cylinder head has two intake valves and two exhaust valves, respectively, and the cylinder head has intake and exhaust valves which are opened and closed by the four valves (two intake valves and two exhaust valves). A four-valve internal combustion engine having four ports is known. As such an intake device for a four-valve internal combustion engine, two intake ducts in an intake manifold are provided for each cylinder, and an intake swirl control valve is provided for each of two intake ducts provided for each cylinder. Some are provided (see JP-A-6-10803 and JP-A-6-10804).

Alternatively, there is an engine in which the intake swirl control valve provided for each cylinder is interposed and connected between a cylinder head and an intake manifold (Japanese Patent Laid-Open No. Hei 5-26364).
8 and JP-A-7-26968).
Also, two intake ducts are provided for each cylinder.
There is a configuration in which it is connected to two separate collecting chambers (see JP-A-5-18254).

[0004]

However, one of two intake ducts provided for each cylinder is provided with an intake swirl control valve, and another is provided between a cylinder head and an intake manifold. In those in which an intake swirl control valve provided for each cylinder is interposed and connected, since it is necessary to provide an intake swirl control valve for each cylinder, a control device that controls a plurality of intake swirl control valves becomes complicated, It also leads to an increase in weight. In addition, the control variation of the intake swirl control valve for each cylinder is likely to occur, and the output performance of the engine,
There is also a problem that the exhaust gas purification performance is hindered.

Further, in a configuration in which two intake ducts provided for each cylinder are connected to two separate collective chambers, the collective chambers are separate and large, so that mounting on a vehicle is impossible. There is a risk of becoming. On the other hand, as a configuration of the intake device without the above-described problems, the intake manifold itself is configured such that two identical intake ducts provided for each cylinder are assembled into a two-system intake system. (See Japanese Utility Model Laid-Open No. 6-67846 and Japanese Patent Laid-Open No. 6-67847).

In this case, an opening communicating with each intake system is separated into two openings by a separating wall in the collecting section of the intake manifold, and an intake swirl control valve is provided on one of the openings, and a collecting section downstream of the separating wall is provided. An intake throttle valve for performing engine stop control and exhaust gas recirculation (EGR) control is provided inside. However, in this intake manifold, the whole is integrally formed by casting, and in this case, in fact, due to its structure, it is impossible to manufacture it by casting technology, and it does not materialize as a realistic internal combustion engine part .

The present invention has been made in view of the above, and is an intake device for an internal combustion engine including an intake manifold, an intake throttle valve, and an intake swirl control valve,
An intake device for an internal combustion engine that is compact, reduces weight, simplifies a control device for controlling an intake swirl control valve, improves and stabilizes engine output performance and exhaust gas purification performance, and has excellent manufacturability and productivity. The purpose is to solve.

[0008]

Therefore, according to the first aspect of the present invention, two independent intake ducts provided for each cylinder and an intake duct for each system are assembled for each system. A collection portion, a cylinder head side mounting portion in which a plurality of independent portion side openings of the intake duct portion of each system communicating with the intake passage of each cylinder are formed, and an intake duct portion of each system communicating with the air cleaner side intake passage. An intake manifold formed integrally with components including an air cleaner-side mounting portion having two gathering portion-side openings, and interposed and connected between the intake manifold and the air cleaner-side intake passage; A throttle chamber, one end of which has two downstream openings that communicate with the two manifold-side openings of the intake manifold, and the other end has one upstream opening that communicates with the air cleaner-side intake passage. An intake swirl control valve is provided in one of the two downstream openings, an intake throttle valve is provided in one upstream opening, and the intake swirl control valve is provided therein. And a throttle chamber to which the drive device for the intake throttle valve is attached.

According to a second aspect of the present invention, there is provided an exhaust gas recirculation gas inlet communicating with the intake manifold communicating with one of the two downstream openings of the throttle chamber. Is provided. The operation of the invention will be described.

According to the first aspect of the present invention, the intake air passes through the inside of the throttle chamber from the air cleaner, branches at two downstream openings of the chamber, and flows into the intake ducts of the respective systems of the intake manifold. It is supplied into each cylinder from an intake duct. The intake swirl control valve, for example,
When the engine speed is low, it is closed, and the intake swirl is strengthened. When the engine speed is high, it is opened,
Reduce intake swirl.

When the engine is stopped, the intake throttle valve is fully closed to assist in stopping the engine. In the invention according to claim 2, the intake throttle valve is controlled to open and close by, for example, the engine speed and the fuel injection amount, and when closed, the EGR rate increases, and when opened, the EGR rate decreases.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show the structure of an intake manifold 1 constituting an intake device in a diesel engine as an internal combustion engine of the present invention. In these figures, intake manifold 1 has two independent intake duct sections 2A, 3A, 4 provided for each of cylinders # 1 to # 4.
A, 5A, 2B, 3B, 4B, 5B, and intake ducts 2A, 3A, 4A, 5A, 2B, 3B, 4B, 5 of each system.
B, collecting sections 6 and 7 for each system, and cylinders # 1 to # 1.
# 4 intake duct portions 2A of each system communicating with the intake passage
3A, 4A, 5A, 2B, 3B, 4B, 5B independent portion side openings 8A, 9A, 10A, 11A, 8B, 9B, 10
Cylinder head side mounting part 1 in which a plurality of B and 11B are formed
2 and intake ducts 2A, 3A, 4A, 5A, 2B, 3B, 4B, 4B,
The air cleaner side mounting portion 13 in which two openings 6A and 7A on the side of the collecting portions 6 and 7 of 5B are formed is integrally formed by casting, respectively.

The intake manifold 1 has an opening 7 on the collecting section 7 side which communicates with one of two downstream openings of a throttle chamber described later.
An exhaust gas recirculation (EGR) gas inlet portion 14 communicating with A is provided. On the other hand, the throttle chamber 15 constituting the intake device of the present invention is interposed and connected between the intake manifold 1 and the intake passage on the air cleaner side.

As shown in FIGS. 3 and 4, a partition wall 16 is integrally formed inside one end of the throttle chamber 15, and an opening on the side of the two collecting portions 6, 7 of the intake manifold 1 is formed. Two downstream openings 17 and 18 to which 6A and 7A communicate are formed. One upstream opening 19 is formed at the other end of the throttle chamber 15 so as to communicate with the air cleaner-side intake passage. And
One opening 1 of the two downstream openings 17 and 18
7, an intake swirl control valve 20 is provided with one upstream opening 1
An intake throttle valve 21 is incorporated in each of the components 9 and a drive device 20A for the intake swirl control valve 20 and a drive device 21A for the intake throttle valve 21 are attached.

Here, the drive devices 20A and 21A of the intake swirl control valve 20 and the intake throttle valve 21 are controlled so that their opening and closing are controlled according to the operating state of the engine.
Are controlled based on control signals from a control unit (not shown). That is, the intake swirl control valve 2
0 is closed when the engine rotation speed is low, thereby increasing the intake air flow in the intake duct portion other than the intake duct portion on the closed side, and as a result, the intake swirl in the cylinder liner is strengthened. Then, when the engine speed is high, it is opened to weaken the intake swirl.

On the other hand, the opening and closing of the intake throttle valve 21 is controlled by the engine speed and the fuel injection amount as shown in the graph of FIG. Note that, when the intake throttle valve 21 is closed, the EGR rate increases, and when the intake throttle valve 21 is opened, the EGR rate decreases. In addition to the intake throttle function, the intake throttle valve 21 is fully closed when the engine is stopped, and functions as an intake cut valve that assists in stopping the engine.

FIG. 6 shows a state in which the intake manifold 1 and the throttle chamber 15 are assembled and attached to the cylinder head 22. In FIG. 6, reference numeral 23 denotes an intake duct on the cylinder head 22 side; 24, an intake pipe; and 25, a mounting band. According to the intake device having such a configuration, two independent intake duct portions provided for each of the cylinders # 1 to # 4 are formed in the intake manifold 1, and the intake duct portions of the respective systems are assembled for each system. As described above, the intake swirl control valve 20 and the intake throttle valve 21 are built in the throttle chamber 15 interposed between the intake manifold 1 and the air cleaner side intake passage.
Since it is not necessary to provide an intake swirl control valve for each cylinder, the number of parts can be reduced, and a control device for controlling a plurality of intake swirl control valves can be simplified and the weight can be reduced.

Further, since only the single intake swirl control valve 20 is provided, the output performance of the engine and the exhaust gas purification performance can be improved without concern about control variations. Furthermore,
In a configuration in which two intake ducts provided for each cylinder are connected to two separate collective chambers, the collective chambers are separate and large, so that mounting on a vehicle may be impossible. Since only a single throttle chamber is provided, it is advantageous on a vehicle.

In particular, since it is not necessary to provide the intake swirl control valve 20 and the intake throttle valve 21 on the intake manifold 1 side, when the entire intake manifold 1 is integrally formed by casting, the structure of the intake manifold 1 is reduced by casting technology. It can be said that it is easy to manufacture and realistic.

[0020]

As described above, according to the first aspect of the present invention, it is not necessary to provide an intake swirl control valve for each cylinder, the number of parts is reduced, the control device is simplified, the output performance of the engine, In addition to improving exhaust gas purification performance and vehicle-mountability, it is not necessary to provide an intake swirl control valve and an intake throttle valve on the intake manifold side. It can be said that the structure is easy to manufacture and practical due to casting technology.

According to the second aspect of the present invention, it is possible to control the EGR rate by controlling the opening and closing of the intake throttle valve.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an intake manifold of an intake device for an internal combustion engine according to the present invention.

FIG. 2 is a right side view thereof.

3A and 3B are views showing one embodiment of the throttle chamber of the intake device, in which FIG. 3A is a front view and FIG. 3B is a bottom view;

FIG. 4 is a sectional view taken along the line AA in FIG. 3 (A).

FIG. 5 is a graph for explaining the opening / closing control of an intake throttle valve in the embodiment.

FIG. 6 is a sectional view showing a state in which the intake manifold and the throttle chamber in the above embodiment are assembled and attached to a cylinder head.

[Explanation of symbols]

1 Intake manifold # 1 to # 4 Each cylinder 2A, 3A, 4A, 5A, 2B, 3B, 4B, 5B Intake duct part 6, 7 Assembly part 8A, 9A, 10A, 11A, 8B, 9B, 10B, 1
1B Independent part side opening part 12 Cylinder head side mounting part 6A, 7A opening part 13 Air cleaner side mounting part 14 Exhaust gas recirculation (EGR) gas inlet part 15 Throttle chamber 17, 18 Downstream side opening 19 Upstream side opening 20 Intake swirl control Valve 20A drive device 21 Intake throttle valve 21A drive device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 69/00 F02M 69/00 350W

Claims (2)

[Claims] 1. An independent intake duct section provided for each cylinder, a collecting section for collecting the intake duct sections of each system for each system, and a system section for communicating with an intake passage of each cylinder. A cylinder head-side mounting portion in which a plurality of independent portion-side openings of the intake duct portion are formed, and an air cleaner-side mounting portion in which two collecting portion-side openings of the intake duct portions of each system communicating with the air cleaner-side intake passage are formed. And a throttle chamber interposed and connected between the intake manifold and the air cleaner-side intake passage, wherein one end of the intake manifold is connected to the intake manifold. Two downstream openings that are connected to the collecting portion side opening, and one upstream opening that is connected to the other end of the air cleaner side intake passage are provided, respectively. An intake swirl control valve is incorporated in one opening, an intake throttle valve is incorporated in one upstream opening, and a drive device for the intake swirl control valve and a drive device for the intake throttle valve are mounted. An intake device for an internal combustion engine, comprising: a throttle chamber configured to: 2. The exhaust manifold has an exhaust gas recirculation gas inlet communicating with a collector side opening communicating with one of the two downstream openings of the throttle chamber. The intake device for an internal combustion engine according to claim 1, wherein