JPH07332206A - Intake device of internal combustion engine - Google Patents

Abstract

PURPOSE:To secure a sufficient air flow as well as providing favarable spray in an intake device provided with an intake control valve in one of two intake ports. CONSTITUTION:In the intake device of an internal combustion engine 2, the passage sectional area of a first injection passage part 30 communicated with a first intake port part 22 is set larger than that of a second injection passage part 32 communicated with a second intake port part 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an internal combustion engine, and particularly to a structure in which an intake control valve is provided at one of two intake port portions, which can improve the spray and secure a sufficient air flow. The present invention relates to an intake device for an internal combustion engine.

[0002]

2. Description of the Related Art In an internal combustion engine of a vehicle, as a countermeasure against problems such as a fuel consumption rate and harmful components of exhaust gas, a swirl is generated in air taken into a combustion chamber or a cylinder to improve combustibility. Some are equipped with devices.

In this intake system, the intake port of the internal combustion engine is divided into a first intake port section and a second intake port section by a partition wall, and they are provided so as to communicate with a single combustion chamber of the internal combustion engine. (2) An intake control valve that is opened / closed according to the engine operating state is provided in the intake port section, and the first intake port whose one end side is joined to the partition wall at the joining section and the other end side is located downstream of the intake control valve Section and second intake port section are respectively provided with a first injection passage section and a second injection passage section that are directed toward the combustion chamber and communicate with each other, and the combustion chamber is provided via the first injection passage section and the second injection passage section, respectively. There is a configuration in which a fuel injection valve having a first injection port portion and a second injection port portion oriented in a direction is provided.

Examples of such an intake device include, for example, Japanese Utility Model Laid-Open No. 61-147336 and Japanese Utility Model Laid-Open No. 4-47165.
Japanese Patent Application Laid-Open No. 4-262063. The one described in Japanese Utility Model Publication No. 61-147336 has
A helical first intake port for generating swirl in the combustion chamber and a straight second intake port are formed so as to communicate with the combustion chamber of each cylinder via each intake valve.
The intake port is provided with an intake control valve that closes at low engine speed and light load, and the injection port of the fuel injection valve is
A fuel injection valve having two injection ports is installed so that a partition between the intake port and the second intake port closes both intake ports at a portion between the intake control valve and the intake valve. There is. In Japanese Utility Model Laid-Open No. 4-47165, the first intake port and the second intake port are connected to a single cylinder, and the second intake port is connected to the first intake port and the second intake port according to the engine operating state. An intake control valve for opening and closing the second intake port is provided, and a first injector port and a second injector port separated by a separation wall are connected to the first intake port and the second intake port, respectively. A fuel injection valve having two nozzles capable of injecting fuel into the first injector port and the second injector port is arranged at the confluence of the injector port and the second injector port of ,
The first injector port and the second injector port are located downstream of the upstream ends of the openings to the first intake port and the second intake port. Japanese Patent Application Laid-Open No. 4-262063 includes a swirl port, a straight port, and an intake control valve that closes the intake passage on the straight port side according to engine operating conditions, and is provided in a communication passage of an intake passage partition wall. Of the internal combustion engine that injects fuel from the fuel injection valve to both ports,
A projection for separating the intake air flow from the wall surface is arranged on the side wall surface of the swirl port of the partition wall downstream of the communication passage.

[0005]

However, in the conventional intake device, the passage disconnection between the first and second injection passage portions, which are the communication holes that connect the first intake port portion and the second intake port portion, is made. When a large area is formed, there is a problem that the swirl ratio of intake air decreases.

In order to solve this problem, when the passage cross-sectional areas of the first and second injection passage portions, which are the above-mentioned communication holes, are formed to be small, the passage to the second intake port portion when the intake control valve is closed is performed. However, there was a problem that the fuel did not adhere to the inner wall surface forming the second intake port portion because the air flow did not flow sufficiently.

Further, when the fuel is injected through the above-mentioned first and second injection passage portions, there is a disadvantage that the air flow flowing through the first and second injection passage portions at the first intake port portion interferes with the fuel injection. .

[0008]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned inconvenience, therefore, the present invention separates the intake port of the internal combustion engine into a first intake port portion and a second intake port portion by a partition wall. A single combustion chamber in communication with each other, and an intake control valve that opens and closes according to an engine operating state is provided in the second intake port section. One end side of the partition wall is merged with the other end side of the intake control valve. A first intake port portion and a second intake port portion, which are located downstream of the intake control valve, are respectively directed toward the combustion chamber and communicate with each other.
Fuel injection having an injection passage part and a second injection passage part, and having a first injection port part and a second injection port part directed toward the combustion chamber via the first injection passage part and the second injection passage part, respectively. In the intake system for an internal combustion engine provided with a valve, the first
The passage cross-sectional area of the injection passage portion is set to be larger than the passage cross-sectional area of the second injection passage portion.

[0009]

According to the structure of the present invention, during the closing operation of the intake control valve, a part of the air flow in the first intake port portion becomes the first
Since it reaches the second intake port portion via the injection passage portion and the second injection passage portion, there is no risk of fuel adhering to or staying on the inner wall surfaces of the second injection passage portion and the second intake port portion, and the first intake air portion. Since the passage cross-sectional area of the port portion is set to be large, even if a part of the air flow of the first intake port portion flows into the first intake port portion, the fuel injection into the first intake port portion is the same as the above-described air injection. Not disturbed by the flow.

On the other hand, during the opening operation of the intake control valve,
Fuel from the fuel injection valve is supplied from the first and second injection passage portions to the first and second intake port portions, and then the first and second intake port portions are supplied.
It is smoothly guided to the fuel chamber along with the air flow in the intake port.

[0011]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 1, 2 is an internal combustion engine, 4 is a combustion chamber, 6 is an intake port, 8-1 and 8-2 are first and second
Intake ports 10-1, 10-2 are first and second intake valves, 12
-1, 12-2 are first and second exhaust ports, 14-1, 14-
2 is the first and second exhaust valves, 16-1 and 16-2 are the first and second exhaust ports, and 18 is the spark plug.

The intake port 6 is connected to the combustion chamber 4 by a partition wall 20 which is separated into first and second intake port portions 22 and 24.

An intake control valve 26, which is opened and closed according to the operating state of the internal combustion engine 2, is disposed in the second intake port section 22.

One end side of the partition wall 20 is merged at the merging portion 28 at the central portion, and the other end side is joined to the intake control valve 2.
First and second intake port portions 2 located downstream of 6
2 and 24 are directed toward the combustion chamber 4 respectively, and the first and second
First and second injection passage portions 30, 32 communicating with the center lines C ₁ , C ₂ are formed.

As shown in FIG. 2, the first injection passage portion 30 is
It is formed in a passage cross-sectional area having a predetermined same diameter D ₁ .
Further, the second injection passage portion 32 is formed in a passage sectional area having the same diameter D ₂ which is larger than the diameter D _{1 of} the first injection passage portion 30.

A fuel injection valve 38 having a first injection port portion 34 and a second injection port portion 36 is arranged at the confluent portion 28 of the partition wall 20. In the fuel injection valve 38, the first injection port portion 34 faces the first injection passage portion 30 and the second injection port portion 36 faces the second injection passage portion 32.

Next, the operation of this embodiment will be described.

As shown in FIG. 3, in the closed state of the intake control valve 26, the upstream side of the second intake port portion 24 is closed by the intake control valve 26, but the flow from the upstream side of the first intake port portion 22. Part of the incoming airflow passes through the first injection passage portion 30, the merging portion 28, and the second injection passage portion 32,
The intake control valve 26 is guided to the second intake port 24 on the downstream side.

At this time, since the passage cross-sectional area of the first injection passage portion 22 is formed larger than the passage cross-sectional area of the second injection passage portion 24, the injection from the first injection port portion 34 to the first intake port portion 22 is performed. Without interfering with the spray of fuel
Further, the turbulence of the flow in the first injection passage portion 30 and the resistance to the injected fuel are reduced, and even in the second injection passage portion 32 having the minimum passage sectional area, the air flow toward the second intake port portion 24 side. Is sufficiently secured, and as a result, the second injection port portion 36
It is possible to quickly supply the fuel from the second intake port portion 24 side to prevent the fuel from adhering to and staying on the inner wall surface of the second injection passage portion 32 and the inner wall surface of the second intake port portion 24. .

Further, as shown in FIG. 3, the first injection passage portion 3
0 is a portion near the first nozzle portion 34 (shown by A in FIG. 3)
However, since they are formed to have the same diameter D ₁ , the fuel does not adhere to the inner wall surface of the A portion, and even if the fuel adheres to the inner wall surface of the A portion, the influence thereof is small.

On the other hand, as shown in FIG. 4, when the intake control valve 26 is open, the first and second intake port portions 22 and 24 are provided.
The intake air is introduced from the upstream side to the intake port, and the fuel injected from the first and second injection port portions 34 and 36 passes through the first and second injection passage portions 30 and 32 to the first and second intake port portions 22 and 24. To the first and second intake port portions 22 and 24, respectively.
And is smoothly guided to the combustion chamber 4.

Therefore, according to this embodiment, since the passage cross-sectional area of the first injection passage portion 30 is set to be larger than the passage cross-sectional area of the second injection passage portion 32, when the intake control valve 26 is closed, 1 injection passage part 30 to 1st intake port part 2
Of the fuel injection to the second injection passage portion 32, and also to sufficiently secure the air flow to the second injection passage portion 32, to prevent the fuel from adhering to and staying on the inner wall surface, and at the same time to the first injection passage portion. Three
It is possible to reduce the turbulence of the flow of 0 and the resistance to the injected fuel, and to secure a sufficient air flow even in the second injection passage portion 32 having the minimum passage cross-sectional area.

Further, it is possible to prevent the fuel from adhering to the inner wall surface of the first injection passage portion 30 as much as possible, and to reduce the influence even if the fuel adheres to the inner wall surface.

Furthermore, the first and second injection passage portions 30, 32
Are formed by cutting once with a tool such as a drill having different diameters. Thereby, the number of processing steps can be reduced.

[0025]

As is apparent from the above detailed description, according to the present invention, in the intake system of the internal combustion engine, the passage cross-sectional area of the first injection passage portion communicating with the first intake port portion is set to the second passage area.
Since the passage cross-sectional area of the second injection passage portion communicating with the intake port portion is set to be larger than that of the first intake port portion, even if part of the air flow of the first intake port portion flows into the first intake port portion. It is possible to prevent the fuel injection to the portion from being hindered by the air flow.

When the intake control valve is opened,
Fuel from the fuel injection valve. The first and second injection passage parts are supplied to the first and second intake port parts, and the first and second injection port parts are supplied.
It can be smoothly guided to the fuel chamber together with the air flow in the intake port.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an intake system of an internal combustion engine.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view of the main parts when the intake control valve is closed.

FIG. 4 is a cross-sectional view of essential parts in an opened state of an intake control valve.

[Explanation of symbols]

 2 Internal Combustion Engine 4 Combustion Chamber 6 Intake Port 20 Partition Wall 22 First Intake Port Portion 24 Second Intake Port Portion 26 Intake Control Valve 30 First Injection Passage Portion 32 Second Injection Passage Portion 38 Fuel Injection Valve

Claims (1)

[Claims] 1. An intake port of an internal combustion engine is provided with a first partition wall.
An intake control valve, which is separated into an intake port section and a second intake port section, is provided so as to communicate with a single combustion chamber of the internal combustion engine, and which is opened and closed according to the engine operating state in the second intake port section. One end side is joined to the partition wall, and the other end side is directed toward the combustion chamber and communicates with the first intake port portion and the second intake port portion, respectively, which is located downstream of the intake control valve. A first injection passage portion and a second injection passage portion that are directed toward the combustion chamber via the first injection passage portion and the second injection passage portion, respectively. In an intake system for an internal combustion engine provided with a fuel injection valve having a fuel injection valve, the passage cross-sectional area of the first injection passage portion is set to be larger than the passage cross-sectional area of the second injection passage portion. apparatus.