JPH05340326A - Fuel supply device for internal combustion engine - Google Patents

Abstract

PURPOSE:To attain stabilization of combustion by preventing fuel from adhering to surfaces of a valve unit in a device, in an internal combustion engine provided with the swirl control valve device. CONSTITUTION:A swirl control valve device of providing a valve element 3, open/close controlled to have a closed part 3A and a cut part 3B, is provided in the inside of an intake port 2. An extension pipe 14 is connected respectively to two nozzle holes 15A in the point end of an air assist fuel injection valve 7 arranged in the upstream of the valve element 3 to inject fuel to the inside of the intake port 2. Thus at valve closing time of the valve element 3, since atomized fuel B from the fuel injection valve 7 is supplied into the intake port 2 from an extension pipe point end nozzle hole 14A opened to an internal surface of the intake port 2 in the downstream of the valve element 3, the atomized fuel B is prevented from being interrupted by the valve element 3 and also from adhering to the internal surface of the intake port 2 and intake valves 1A, 1B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for an internal combustion engine, and more particularly to a fuel supply technique for an internal combustion engine provided with a swirl control valve device for controlling the flow state of gas flowing into a combustion chamber.

[0002]

2. Description of the Related Art Conventionally, in an internal combustion engine, intake valves 1A,
A blocking portion 3A that is disposed inside the intake port 2 having two 1B and that closes a portion of the intake port 2 corresponding to one intake valve 1B and a cutout portion 3B that opens a portion corresponding to the other intake valve 1A. A swirl control valve (S) for controlling the flow state of the gas flowing into the combustion chamber 4 to enhance the intake swirl.
A device provided with a CV) device is known (see FIG. 2).

A fuel supply device for an internal combustion engine provided with such a swirl control valve device is conventionally a fuel injection valve 5 for injecting fuel from an upstream side of a valve body 3 into an intake port 2 as shown in FIG. Is provided and configured. Two injection holes 5a, 5b are formed in the fuel injection portion 5A at the tip of the fuel injection valve 5, and the fuel is supplied as a spray for diffusing fuel from each injection hole 5a, 5b.

[0004]

In this case, when the valve body 2 is opened, the intake port 2 is opened, and the fuel spray A from both the injection holes 5a and 5b of the fuel injection valve 5 is applied to the valve body 2, respectively. Although it flows without adhering to the surface, when the valve body 2 is closed, the fuel spray A from one injection hole 5b flows to the downstream side of the valve body 3 through the notch 3B of the valve body 3, but the other injection hole 5a. Since the fuel spray A is blocked by the closed portion 3A of the valve body 3, the fuel adheres to the surface of the valve body 3, becomes a fuel wall flow, travels along the inner surface of the intake port 2, and flows into the combustion chamber 4. ..

For this reason, there has been a problem that the delay of fuel transportation is significant, the responsiveness during transient operation of the engine is deteriorated, combustion becomes unstable, and fuel consumption and exhaust emission are impaired. Therefore, in view of the conventional problems as described above, the present invention prevents fuel from adhering to the valve body surface when the valve body of the swirl control valve device is closed in an internal combustion engine equipped with the swirl control valve device. Therefore, it is intended to stabilize the combustion and improve the fuel consumption and the exhaust emission.

[0006]

Therefore, according to the present invention, there is provided a closing portion which is disposed inside an intake port having two intake valves and which closes a portion of the intake port corresponding to the intake valve and the other portion. An internal combustion engine including a valve body that is controlled to be opened and closed with a cutout portion that opens a portion corresponding to an intake valve, and that is provided with a swirl control valve device that controls a flow state of gas flowing into a combustion chamber. , A fuel injection valve that is disposed upstream of the valve element and injects fuel into the intake port, and has a tip fuel injection portion at which a tip fuel injection portion opens at an inner surface of the intake port on the valve element downstream side. An extension pipe section is provided.

[0007]

[Operation] In this structure, the intake swirl is strengthened,
The valve body is closed under engine operating conditions that require stable combustion. When the valve body is closed, the fuel spray from the fuel injection valve is supplied into the intake port from the tip injection port that opens to the inner surface of the intake port on the downstream side of the valve body in the extension pipe section. It is supplied to the combustion chamber without being blocked by the body and without adhering to the inner surface of the intake port or the intake valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. In the following drawings, the same elements as those in FIG. 2 are designated by the same reference numerals to simplify the description. In FIG. 1, the intake pipe 6 and the combustion chamber 4 are connected to each other through an intake port 2 having two intake valves 1A and 1B. Inside the intake port 2, there is a closed portion 3A that closes a portion of the intake port 2 corresponding to one intake valve 1A and a notch portion 3B that opens a portion corresponding to the other intake valve 1B. The configuration including the valve body 3 that is controlled to be closed and the swirl control valve (SCV) device that controls the flow state of the gas flowing into the combustion chamber 4 to strengthen the intake swirl is the same as the conventional one.

An air-assisted fuel injection valve 7 is provided upstream of the valve body 3 to inject fuel into the intake port 2. The air-assisted fuel injection valve 7 pumps a part of the intake air from the intake passage upstream of the throttle valve as assist air to the downstream side of the injection hole of the fuel injection valve incorporated by the air pump, and injects it from the fuel injection valve. By colliding the assisted air with the generated fuel, the fuel is atomized, thereby improving combustion.

Specifically, a fuel injection valve 8 is built in the main body of the air-assisted fuel injection valve 7, and the fuel and atomized air are mixed on the downstream side of the fuel injection valve 8. A mixing section 9 is provided. The mixing unit 9 has a tubular body 1 forming a passage for fuel injected from the fuel injection valve 8.
0 is provided, and a large number of injection holes 11 are provided on the peripheral wall of the cylindrical body 10.

An air gallery (not shown) for introducing the pressurized air discharged from the air pump downstream of the injection hole of the fuel injection valve is provided. In particular, the air-assisted fuel injection valve 7 supplies fuel spray during the intake stroke, and is a large flow rate type injection valve having a large fuel passage area at the tip fuel injection portion.

The air-assisted fuel injection valve 7 having the above structure
Are attached to the intake pipe 6. Specifically, the intake pipe 6
A cylindrical mounting portion 13 is integrally formed on the outer peripheral surface of the connecting end portion of the cylinder head 12, and the tip end of the air-assisted fuel injection valve 7 is fitted and mounted inside the mounting portion 13. Here, in the fuel injection part at the tip of the fuel injection valve 7,
On the inner surface of the intake port 2 on the downstream side of the valve body 3, an extension pipe 14 is provided as an extension pipe line portion in which a tip injection port opens.

That is, at the tip of the fuel injection valve 7, two injection holes 15 opened toward the intake valves 1A and 1B, respectively.
A is formed, and the extension pipe 14 is connected to each injection hole 15A. The extension pipe 14 is pierced and supported by a through hole 16 formed in the mounting portion 13, and at the same time, the cylinder head 1
2 is formed in the through hole 17, and the tip end injection port 14A of the extension pipe 14 has a through hole 1 that opens to the inner surface of the intake port 2.
7 is opened inside the opening end.

In this case, the tip injection port 14A of each extension pipe 14
As shown in FIG. 1 (B), are opened in parallel at a position near the upper edge of the valve body 3. Next, the operation of the device having such a configuration will be described. The valve body 3 is closed under the engine operating condition where it is necessary to strengthen the intake swirl and stabilize the combustion. When the valve body 3 is closed, the fuel spray B from the air-assisted fuel injection valve 7 flows into the intake port 2 on the downstream side of the valve body 3.
The intake port 2 from the extension pipe tip injection port 14A opening to the inner surface
Since the fuel spray B is supplied to the inside of the intake port 2, the fuel spray B is not blocked by the valve body 3, and the intake port 2 and the intake valves 1A, 1
Without adhering to B as well, it is sufficiently mixed with air and supplied to the combustion chamber.

As a result of the above, fuel transportation delay can be suppressed,
Since the responsiveness during transient operation of the engine is made good, combustion is stabilized, which in turn improves fuel efficiency and exhaust emissions. As described above, the present invention has been described with reference to the specific embodiments, but the present invention is not limited to this, and a patent attached to the present invention by a person skilled in the art or the like. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0016]

As described above, according to the present invention,
In an internal combustion engine having a swirl control valve device for controlling a flow state of gas flowing into a combustion chamber inside an intake port having two intake valves, a fuel of a fuel injection valve disposed upstream of a valve body The fuel injected from the injection unit is sprayed from the inner surface of the intake port downstream of the valve body into the intake port through the extension pipe section. It is possible to suppress the generation of the fuel wall flow without colliding or adhering to the surface or the like, stabilizing combustion, and improving fuel efficiency and exhaust emission, which is very useful.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a fuel supply device for an internal combustion engine according to the present invention, where FIG. 1A is a front view and FIG.
Arrow view

2A and 2B are views showing an example of a conventional fuel supply device for an internal combustion engine, FIG. 2A is a front view, and FIG.

[Explanation of symbols]

 1A intake valve 1B intake valve 2 intake port 3 valve body 3A block 3B notch 4 combustion chamber 7 air-assisted fuel injection valve 14 extension pipe 14A tip injection port

Claims (1)

[Claims] 1. A closed portion, which is provided inside an intake port having two intake valves and closes a portion of the intake port corresponding to one intake valve, and a cutout portion which opens a portion corresponding to the other intake valve. In an internal combustion engine having a valve body that is controlled to be opened and closed by having a swirl control valve device that controls the flow state of gas flowing into the combustion chamber, the internal combustion engine is disposed on the upstream side of the valve body, A fuel injection valve for injecting fuel is provided inside the intake port, and an extension pipe portion having an opening at the tip injection port is provided at the tip fuel injection portion of the fuel injection valve on the inner surface of the intake port on the downstream side of the valve body. Fuel supply device for internal combustion engine.