JPH1193808A - Injection supply device for liquid fuel in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce specific consumption of liquid fuel, and reduce environmental pollution of exhaust gas by introducing inflammable gas such as natural gas, propane gas or hydrogen gas filled in a high pressure gas cylinder, to an air assist passage in an air assist method or an air blast valve in an air blast method. SOLUTION: A fuel injector 1 installed in an intake passage 2 of an intake port to a combustion chamber in an internal combustion engine, is provided with an air assist passage 3 opening in the intake passage 2 and a fuel injection valve 4 to inject/supply liquid fuel such as gasoline, gas oil, methanol or ethanol into this air assist passage 3. Since inflammable gas such as natural gas, propane gas or hydrogen gas can be supplied to the air assist passage 3 in the fuel injector 1, atomization of the liquid fuel injected/supplied from the fuel injection valve 4 can be promoted. Since this inflammable gas enters the combustion chamber together with the liquid fuel and burns together with the liquid fuel, fuel consumption, and environmental pollution can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for injecting and supplying liquid fuel such as gasoline to a cylinder in an internal combustion engine by an air assist system or an air blast system.

[0002]

2. Description of the Related Art In a recent internal combustion engine, liquid fuel such as gasoline is injected and supplied by an air assist system or an air blast system. As described in JP-247940, the compressed air compressed by an air pump is injected into an air assist passage that injects the fuel from the fuel injection valve, whereby the fuel injected from the fuel injection valve is discharged. Atomization is promoted, and the latter air blast method uses a fuel injected from a fuel injection valve and an air pump as described in, for example, Japanese Patent Laid-Open No. 19356/1992. After the compressed air is mixed with the compressed air in the air blast valve, the air is injected into the cylinder when the air blast valve is opened, thereby atomizing the fuel injected from the fuel injection valve. It is intended to promote.

[0003]

However, both the air assist system and the air blast system promote the atomization of fuel by jetting compressed air, and supply compressed air to a cylinder. By being
Since the supply amount of the liquid fuel must be increased by an amount corresponding to the supply of the compressed air, there is a problem that it hardly contributes to the reduction of the consumption rate of the liquid fuel and the reduction of the exhaust gas pollution. there were.

In addition, since the air pump must be constantly driven by the internal combustion engine, not only the power loss of the internal combustion engine is large, but also at the beginning of the start of the internal combustion engine,
There is also a problem that the liquid fuel injection and supply cannot be realized by the air assist system and the air blast system. An object of the present invention is to solve these problems.

[0005]

In order to achieve this technical object, the present invention provides a fuel injection device of an air assist type and an air blast type using a liquid fuel as a fuel. Alternatively, a combustible gas such as natural gas, propane gas, or hydrogen gas filled in a high-pressure gas cylinder is introduced into the air blast valve in the air blast system. "

The present invention also provides a fuel injection device of an air assist type and an air blast type using a liquid fuel as a fuel, wherein a high pressure is applied to an air assist passage in the air assist type or an air blast valve in the air blast type. The carbon dioxide gas filled in the gas cylinder is introduced. "

Further, the present invention provides a fuel injection device of an air assist type and an air blast type using a liquid fuel as fuel, wherein the air assist passage in the air assist type or the air blast valve in the air blast type includes: The oxygen gas filled in the high-pressure gas cylinder is introduced. "

[0008]

As described above, the combustible gas such as natural gas, propane gas or hydrogen gas filled in the high-pressure gas cylinder is introduced into the air assist passage in the air assist system or the air blast valve in the air blast system. By this, the atomization of the liquid fuel can be promoted by the combustible gas, while the combustible gas is also burned and can be effectively used to increase the thermal efficiency, and the supply amount of the liquid fuel is increased accordingly. Therefore, it is possible to reduce the consumption rate of the liquid fuel and to reduce the pollution of the exhaust gas.

Further, by introducing carbon dioxide gas filled in a high-pressure gas cylinder into an air assist passage in the air assist system or an air blast valve in the air blast system, the introduction of the carbon dioxide gas causes atomization of the liquid fuel. On the other hand, the carbon dioxide gas has the effect of effectively suppressing the generation of nitrogen oxides during the combustion of liquid fuel, as in the case of recirculating exhaust gas from the internal combustion engine to the intake system, It is possible to achieve low pollution of the exhaust gas, and since the carbon dioxide gas increases the polytropic index when burning the liquid fuel, the thermal efficiency is increased and the consumption rate of the liquid fuel can be reduced.

Further, by introducing oxygen gas filled in a high-pressure gas cylinder into an air assist passage in the air assist system or an air blast valve in the air blast system, atomization of the liquid fuel is performed by introducing the oxygen gas. On the other hand, since this oxygen gas directly contributes to the combustion of the liquid fuel, the combustion efficiency is increased, the fuel consumption can be reduced, and the generation of smoke during the combustion can be surely suppressed. The introduction of the oxygen gas can increase the filling efficiency, so that the output can be improved.

In particular, since all of these use a gas filled in a high-pressure gas cylinder, it is possible to realize the injection and supply of liquid fuel by an air assist system or an air blast system from the beginning of the start of the internal combustion engine, and to realize the conventional method. Power loss can be avoided by rotating the air pump by the internal combustion engine.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawing of FIG. In FIG.
Denotes a fuel injector attached to an intake passage 2 such as an intake port to a combustion chamber (not shown) in an internal combustion engine;
The fuel injector 1 includes an air assist passage 3 that opens into an intake passage 2 and a fuel injection valve 4 that injects liquid fuel such as gasoline, light oil, methanol, or ethanol into the air assist passage 3. Is provided.

Reference numeral 5 denotes the fuel injector 1 via a gas supply line 8 having a pressure regulating valve 6 and an assist control valve 7.
2 shows a high-pressure gas cylinder connected to the air assist passage 3 in which the flammable gas such as natural gas, propane gas or hydrogen gas is filled.
The fuel injection valve 4 and the assist control valve 7 are controlled by an electronic control circuit 9 that receives the operating state of the internal combustion engine as an input.

Thus, a flammable gas such as natural gas, propane gas or hydrogen gas can be supplied to the air assist passage 3 in the fuel injector 1. This combustible gas enters the combustion chamber together with the liquid fuel and burns together with the liquid fuel. Also,
By filling the high-pressure gas cylinder 5 with carbon dioxide gas, carbon dioxide gas can be supplied to the air assist passage 3 in the fuel injector 1, so that the liquid fuel injected and supplied from the fuel injection valve 4 is atomized. Can be promoted, the generation of nitrogen oxides during the combustion of the liquid fuel can be effectively suppressed, and the polytropic index during the combustion of the liquid fuel can be increased.

Further, by filling the high-pressure gas cylinder 5 with oxygen gas, oxygen gas can be supplied to the air assist passage 3 in the fuel injector 1, so that the liquid injected and supplied from the fuel injection valve 4 can be supplied. The atomization of the fuel can be promoted, and the oxygen gas directly contributes to the combustion of the liquid fuel, and the introduction efficiency of the oxygen gas can increase the charging efficiency.

When fuel is supplied from the air assist passage 3 of the fuel injector 1 to the intake passage 2 such as an intake port to the combustion chamber, the supply of various gases to the air assist passage 3 is performed. Preferably, the pressure is set at about 100 Kpa by the pressure regulating valve 6. Further, the present invention is not limited to the air assist system described above, but can be naturally applied to an air blast system. In this air blast system, the fuel is injected and supplied to an intake passage such as an intake port. In this case, the supply pressure of the various gases is increased by the pressure regulating valve 6 to about 200 Kpa.
In the case where the fuel is supplied to the combustion chamber, it is preferable that the supply pressure of the various gases is set to about 400 Kpa by the pressure regulating valve 6.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fuel injector 2 intake passage 3 air assist passage 4 fuel injection valve 5 high-pressure gas cylinder 6 pressure regulating valve 7 assist control valve 8 gas supply line

Claims (3)

[Claims] An air-assisted or air-blasted fuel injection device using liquid fuel as fuel, wherein a natural gas filled in a high-pressure gas cylinder is filled in an air-assist passage in the air-assisted system or an air blast valve in the air-blasted system. A liquid fuel injection / supply device for an internal combustion engine, characterized by introducing a combustible gas such as gas, propane gas or hydrogen gas. 2. A fuel injection device of an air assist system and an air blast system using a liquid fuel as fuel, wherein a high pressure gas cylinder is filled in an air assist passage in the air assist system or an air blast valve in the air blast system. An injection supply device for a liquid fuel in an internal combustion engine, wherein a carbon gas is introduced. 3. An air assist type and an air blast type fuel injection device using a liquid fuel as fuel, wherein oxygen filled in a high pressure gas cylinder is filled in an air assist passage in the air assist type or an air blast valve in the air blast type. An injection supply device for a liquid fuel in an internal combustion engine, wherein gas is introduced.