A fuel injection device is provided with a fuel injection valve for injecting fuel into a combustion chamber and an air injection valve for the injection of air into the combustion chamber. One fuel injection orifice which opens into the combustion chamber is provided correspondingly to the fuel inj
A fuel injection device is provided with a fuel injection valve for injecting fuel into a combustion chamber and an air injection valve for the injection of air into the combustion chamber. One fuel injection orifice which opens into the combustion chamber is provided correspondingly to the fuel injection valve and plural air injection orifices which open into the combustion chamber are provided correspondingly to the air injection valve. A design is made so that fuel and air injected from the fuel injection orifice and the air injection orifices come into collision with each other at a collision point. The shape, size and direction of the fuel injection orifice are specified. Likewise, the number, shape, size and direction of the air injection orifice, as well as its arrangement relative to the fuel injection orifice, are specified. A design is made so that the size of a fuel spray and that of air jets at the collision point become equal to each other. A fuel injection control device is provided with various sensors for detecting an operating condition of an engine and an electronic control unit (ECU) for controlling the fuel injection valve and the air injection valve each independently. For controlling a spray penetration distance, a spray particle diameter and a spray shape of the fuel injected from the fuel injection orifice, the ECU, on the basis of the detected operating condition of the engine, controls the fuel injection valve and also controls at least one of timing and period of air injection performed by the air injection valve.
대표청구항▼
What is claimed is: 1. A direct injection type fuel injection device having a fuel injection valve for injecting fuel into a combustion chamber in an internal combustion engine which includes an intake valve and an exhaust valve, and having a gas injection valve for injecting gas into the combustio
What is claimed is: 1. A direct injection type fuel injection device having a fuel injection valve for injecting fuel into a combustion chamber in an internal combustion engine which includes an intake valve and an exhaust valve, and having a gas injection valve for injecting gas into the combustion chamber, the direct injection type fuel injection device comprising: said one fuel injection valve, with one or more fuel injection orifices being provided correspondingly to the fuel injection valve and opened into the combustion chamber; and at least said one gas injection valve, with one or more gas injection orifices being provided correspondingly to the gas injection valve and opened into the combustion chamber, the shape, size, direction, and arrangement of the fuel injection orifice being specified, the number, shape, size, direction, and arrangement relative to the fuel injection orifice, of the gas injection orifice being specified, wherein fuel injected from the fuel injection valve into the combustion chamber through the fuel injection orifice and gas injected from the gas injection valve into the combustion chamber through the gas injection orifice are brought into collision with each other, the gas injection orifice is disposed in the vicinity of the fuel injection orifice, the vicinity is defined by a distance (X) between a center of the fuel injection orifice and a center of the gas injection orifice, represented by the following expression: description="In-line Formulae" end="lead"X≦0.03*d*Pa0.5 *ρa0.35*ρ0-0.85 description="In-line Formulae" end="tail" where "d" stands for the diameter of the gas injection orifice, "Pa" stands for an absolute pressure of the injected gas, "ρa" stands for a gas density under the absolute pressure of the injected gas, and "ρ0" stands for a gas density of an injection site. 2. The direct injection type fuel injection device according to claim 1, wherein the distance (X) is set at a predetermined value in a range of 1 to 4 mm. 3. The direct injection type fuel injection device according to claim 1, wherein an angle of collision between the fuel injected from the fuel injection orifice and the gas injected from the gas injection orifice is set at a predetermined value in a range of 15? to 75?. 4. The direct injection type fuel injection device according to claim 1, wherein pressure of the fuel fed to the fuel injection valve is set at a predetermined value in a range of 1 to 4 MPa. 5. The direct injection type fuel injection device according to claim 1, wherein the size of a gas jet injected from the gas injection orifice is set so as to become almost equal to the size of a fuel spray injected from the fuel injection orifice. 6. The direct injection type fuel injection device according to claim 1, wherein the gas injection orifice is rectangular. 7. The direct injection type fuel injection device according to claim 1, wherein the gas injection orifice includes an inner surface which is tapered divergently in the direction of injection. 8. The direct injection type fuel injection device according to claim 1, wherein the fuel injection orifice is circular, and a plurality of gas injection orifices are formed at equal angle intervals on a circumference centered at the fuel injection orifice. 9. The direct injection type fuel injection device according to claim 8, wherein an angle of collision between the fuel injected from the fuel injection orifice and the gas injected from the gas injection orifice is set at a predetermined value in a range of 15? to 75?. 10. The direct injection type fuel injection device according to claim 8, wherein pressure of the fuel fed to the fuel injection valve is set at a predetermined value in a range of 1 to 4 MPa. 11. The direct injection type fuel injection device according to claim 8, wherein the distance (X) is set at a predetermined value in a range of 1 to 4 mm. 12. The direct injection type fuel injection device according to claim 8, wherein the fuel injection orifice and the plural gas injection orifices are formed in one orifice plate. 13. The direct injection type fuel injection device according to claim 1, wherein the fuel injection orifice is rectangular, and a plurality of gas injection orifices are arranged at equal intervals on both sides of and in the longitudinal direction of the fuel injection orifice. 14. The direct injection type fuel injection device according to claim 13, wherein the fuel injection orifice and the plural gas injection orifices are formed in one orifice plate. 15. The direct injection type fuel injection device according to claim 1, wherein the fuel injection orifice is rectangular, and a pair of gas injection orifices are arranged on both sides of and in parallel with the fuel injection orifice. 16. The direct injection type fuel injection device according to claim 15, wherein the fuel injection orifice and the pair of gas injection orifices are formed in one orifice plate. 17. The direct injection type fuel injection device according to claim 1, wherein the fuel injection orifice is rectangular, and a plurality of gas injection orifices are arranged at equal intervals on one side and in the longitudinal direction of the fuel injection orifice. 18. The direct injection type fuel injection device according to claim 17, wherein the fuel injection orifice and the plural gas injection orifice are formed in one orifice plate. 19. The direct injection type fuel injection device according to claim 1, wherein the fuel injection orifice is rectangular, and one gas injection orifice is disposed on one side of and in parallel with the fuel injection orifice. 20. The direct injection type fuel injection device according to claim 19, wherein the fuel injection orifice and the gas injection orifice are formed in one orifice plate. 21. The direct injection type fuel injection device according to claim 1, wherein the fuel injection valve and the gas injection valve are mounted integrally with each other by a mounting member correspondingly to the combustion chamber. 22. The direct injection type fuel injection device according to claim 1, wherein said plural gas injection valves are provided, one or more gas injection orifices are provided correspondingly to the gas injection valves, and the gas injection valves are switched from one to another in use for switching the injection of gas from the gas injection orifices selectively.
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이 특허에 인용된 특허 (1)
Kelgard Erik (322-8880 No. 1 Road Richmond ; B.C. CAX V7C 4C3), Dual fuel mobil engine system.
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