JPH05202829A - Fuel supply device and method for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To smoothly and reliably introduce the fine fuel injected from the injector into the engine cylinder. [Structure] An annular air nozzle 4 is provided in the injector mounting portion 1A so as to face the injection nozzle 3 of the injector 2. Then, air or exhaust gas is supplied through the pipe line 5 and air or exhaust gas is blown out from the hole 7. As a result, the fuel injected from the injector 2 is conveyed toward the center of the intake pipe 1, and the injector mounting portion 1
Prevents adhesion to the inner wall surface of A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply apparatus and a fuel supply method suitable for an internal combustion engine which supplies fuel by an injector.

[0002]

2. Description of the Related Art In general, a fuel supply system for an internal combustion engine atomizes fuel injected from an injector, thereby improving engine starting performance at low temperatures.
In the conventional fuel injection device, as disclosed in JP-A-55-64152 and JP-A-57-153961, the air branched from the intake pipe is introduced near the fuel injection nozzle of the injector, The fuel is atomized by mixing the introduced air and the fuel.

[0003]

However, in the internal combustion engine, the fuel is injected from the injector before the intake valve is opened, so the injected fuel flows in the intake pipe in a substantially stationary air state before intake in the engine cylinder. Will fly. In still air, the smaller diameter of the fuel droplets produced by atomization has a greater drag effect from the air than the inertia of the droplets, so the flight distance from the injector is small and the wall surface of the upper part of the intake pipe is small. Stays close to.
Therefore, when the intake valve is opened and the air in the intake pipe is sucked into the engine cylinder, the droplet adheres to the upper wall surface of the intake pipe and cannot reach the engine cylinder. As a result, there are problems such as a reduction in fuel consumption and an increase in hydrocarbon component emissions.

Incidentally, as described above, regarding the situation in which the droplets having a small diameter adhere to the wall surface of the intake pipe, Hitachi Review Vol. 39, (1990), N.
o.5, pages 295-298.

An object of the present invention is to provide a fuel supply system and method for an internal combustion engine which can smoothly and surely guide fuel injected from an injector into the engine cylinder.

[0006]

To achieve the above object, the present invention relates to a fuel supply system for an internal combustion engine, which supplies fuel into an engine cylinder by injecting fuel from an injector into an intake pipe. A means for ejecting a fluid that conveys the fuel injected from the direction toward the central portion of the intake pipe is provided.

Further, according to the present invention, an injection nozzle mounting portion is provided in the intake pipe, and fuel is supplied into the engine cylinder by injecting fuel from the injector mounted in the injection nozzle mounting portion into the intake pipe. A fuel supply device for an internal combustion engine is provided with means for ejecting fluid in the same direction as the fuel injection direction and along the inner wall surface of the injection nozzle mounting portion.

Further, according to the present invention, an injection nozzle mounting portion is provided in the intake pipe, and fuel is supplied into the engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle mounting portion. In a fuel supply device for an internal combustion engine, a hole for ejecting a fluid that conveys fuel injected from the injector toward a central portion of the intake pipe is provided on an inner wall surface of the injection nozzle mounting portion.

Further, according to the present invention, an injection nozzle mounting portion is provided on the intake pipe, and fuel is supplied into the engine cylinder by injecting fuel into the intake pipe from an injector mounted on the injection nozzle mounting portion. In a fuel supply device for an internal combustion engine, suction means for sucking air from an intake pipe between an air cleaner and a throttle valve, storage means for temporarily storing the sucked air, and air in the storage means in a fuel injection direction. Means for blowing out in the same direction as the above and in the direction along the inner wall surface of the injection nozzle mounting portion, and control means for controlling the amount of air blown out are provided.

Further, according to the present invention, an injection nozzle mounting portion is provided in the intake pipe, and fuel is supplied into the engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle mounting portion. In a fuel supply device for an internal combustion engine, suction means for sucking air from an intake pipe between an air cleaner and a throttle valve, storage means for temporarily storing the sucked air, and the injection nozzle for discharging the air in the storage means. A means for blowing out the injected fuel from the inner wall surface of the mounting portion along the moving direction of the injected fuel, and a control means for controlling the blowing amount of the air are provided.

Further, according to the present invention, an injection nozzle mounting portion is provided in the intake pipe, and fuel is supplied into the engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle mounting portion. In a fuel supply device for an internal combustion engine, a storage means for temporarily storing exhaust gas from an exhaust pipe, and exhaust gas in the storage means from an inner wall surface of the injection nozzle mounting portion along a moving direction of the injected fuel. A blowout means and a control means for controlling the blowout amount of the exhaust gas are provided.

Further, according to the present invention, an injection nozzle mounting portion is provided in the intake pipe, and fuel is supplied into the engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle mounting portion. In a fuel supply device for an internal combustion engine, a storage means for temporarily storing exhaust gas from an exhaust pipe, and the exhaust gas in the storage means is blown out from an inner wall surface of the injection nozzle mounting portion along a moving direction of the injected fuel. Means and control means for controlling the amount of exhaust gas blown out are provided.

Further, according to the present invention, when the fuel is injected from the injector into the intake pipe to supply the fuel into the engine cylinder, a fluid is ejected along the fuel injection direction from the injector, and the fluid is used to That is, the injected fuel is conveyed toward the central portion of the intake pipe.

[0014]

According to the present invention, the fuel injected from the injector moves toward the center of the intake pipe without deviating from the injection direction. Droplets with a particularly small diameter move smoothly along the flow of the ejected fluid. Therefore, the liquid droplets of fuel do not adhere to the upper wall surface of the intake pipe, the injected fuel is surely sucked into the engine cylinder, and it is possible to improve the characteristics of the engine such as fuel consumption and hydrocarbon component emission amount. It will be possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a schematic structure of a fuel supply system for an internal combustion engine according to a first embodiment of the present invention. As shown in the drawing, an injection nozzle mounting portion 1A is provided at an upper portion of an intake pipe 1, and an injector 2 having an injection nozzle 3 is attached to a tip end portion of the injection nozzle mounting portion 1A. An air nozzle 4 is provided at a position facing the injection nozzle 3 in the injection nozzle mounting portion 1A. Air is supplied to the air nozzle 4 from the outside of the intake pipe 1 through a pipe line 5.

The air nozzle 4 has a cylindrical shape as shown in FIG. 2, has a through hole 4a formed in the center thereof, and prevents the fuel 3a (see FIG. 1) injected from the injector 2 from flying. It has no structure. Also, the air nozzle 4
A plurality of small holes 7 are formed on one side of the sheet along the circumferential direction. These holes 7 have a structure in which they communicate with each other through a communication portion 7a.

Then, as shown in FIG. 1, the air nozzle 4
Is the injection nozzle 3 of the injector 2 on the surface where the hole 7 is opened.
The communication portion 7a (see FIG. 2) is disposed on the side opposite to the above, and is connected to the conduit 5 outside the intake pipe. Air from the intake pipe or exhaust gas from the exhaust pipe is supplied to the pipeline 5. Details of this will be described later.

Next, the operation of this embodiment will be described.
Air or exhaust gas is supplied from the air nozzle 4 before the fuel is injected from the injector 2. Then,
Air or exhaust gas is blown out from the hole 7 in the same direction as the arrow 3b in which the injected fuel 3a is moved. As a result, AA '
As shown in FIG. 3, the air flow velocity distribution in the cross section along the line is such that the velocity of the injected fuel at a position away from the central portion is larger than the central portion. As a result, the fuel droplets 3c staying on the outer periphery of the flow path can be conveyed toward the center of the intake pipe 1. Then, when an intake valve (not shown) is opened, air flows in the intake pipe 1 in the direction of the arrow 3d, and the droplets carried to the vicinity of the center of the intake pipe are carried into the engine cylinder connected to the right end of FIG. ..

Instead of providing the air nozzle 4, the injection nozzle 3 of the injector 2 may be provided with a hole for blowing air.

According to this embodiment, the fuel droplets do not stay in the injector mounting portion 1A and are reliably transported into the engine cylinder. Therefore, the injector mounting portion 1A
Moreover, almost all of the injected fuel can be sucked into the engine cylinder without adhering to the upper wall surface of the intake pipe 1, and the fuel efficiency and exhaust gas characteristics of the engine can be improved.

(Second Embodiment) FIG. 4 shows a schematic structure of a fuel supply system for an internal combustion engine according to a second embodiment of the present invention. In the present embodiment, the wall surface 20 of the injector mounting portion 1A
A plurality of small holes 13 are provided in the pipe 1. These holes 13 are communicated with each other by a pipe line 14 in the wall surface 20 and are connected to a pipe line 5 that guides air from the outside of the intake pipe 1.

In the above structure, when air or exhaust gas is supplied from the pipe line 5 to the pipe line 14, the air or exhaust gas is inclined along the moving direction of the injected fuel (direction of arrow 15). Blow out from hole 13 for that reason,
The fuel droplets 3c staying in the space inside the injector mounting portion 1A near the injector 2 can be transported to the center of the intake pipe 1. Then, when an intake valve (not shown) is opened, air flows in the intake pipe 1 in the direction of the arrow 3d, and the droplets transported near the center of the intake pipe 1 enter the engine cylinder connected to the right end of the drawing. Can be carried.

Although the hole 13 is provided only on one side of the wall surface 20 of the injector mounting portion 1A in FIG. 4, this hole 13 may be provided on the entire inner circumference of the injector mounting portion 1A.

According to the present embodiment, the fuel droplets are transported into the engine cylinder without staying in the injector mounting portion 1A, so that the fuel consumption and the characteristics of exhaust gas can be improved and the injector can be improved. Since there is no obstacle in the space facing the second nozzle 3, the injector can be installed easily.

(Third Embodiment) FIG. 5 shows a third embodiment of the present invention. This embodiment is an example of an apparatus for supplying air to the air nozzle of the first embodiment. As shown in the figure, air is sucked from a suction pipe between the air cleaner 30 and the air flow meter 31 by a compressor 32, and the sucked air is stored in an accumulator 33. The air stored in the accumulator 33 is supplied to the conduit 5 via the flow rate control valve 34. The control device 35 determines the opening / closing time, the flow rate, etc. by inputting the crank angle of the engine, the intake air amount, and the engine speed, and adjusts the opening / closing timing and the opening degree of the flow rate control valve 34. Reference numeral 36 in the drawing is a throttle valve.

Instead of the air nozzle 4, a hole 13 may be provided in the injector mounting portion 1A as in the second embodiment, and the conduit 5 may be connected to this hole 13.

According to the present embodiment, the amount of air supplied to the air nozzle 4 can be adjusted according to the crank angle, the intake air amount and the engine speed, so that fine control can be realized under a wide range of operating conditions. it can.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment of the present invention. This embodiment is also an apparatus for supplying air to the air nozzle of the first embodiment, and is an example in which exhaust gas is used as a fluid for conveying the injected fuel toward the central portion of the intake pipe 1. The exhaust pipe 40 of the engine and the surge tank 41 are connected by a pipe line 42.
1 and the air nozzle 4 are connected via a flow rate control valve 43 and a pipe line 5. Further, the opening / closing timing and the opening degree of the flow rate control valve 43 are controlled by the control device 44. The surge tank 41 is provided with a pressure sensor 45, and the signal of the pressure sensor 45 is taken into the control device 44.

According to the above structure, when the exhaust valve 46 is opened and the exhaust gas is discharged to the exhaust pipe 40 in the exhaust stroke,
A part of the exhaust gas enters the surge tank 41 through the pipe 42. In the surge tank 41, the exhaust gas that pulsates and flows in during the exhaust stroke is accumulated, and after the pulsation is reduced, the exhaust gas is supplied to the air nozzle 4. The supply amount is the flow rate control valve 43
It is adjusted by the opening degree of. The pressure in the surge tank 41 is constantly monitored by the pressure sensor 45.

Instead of the air nozzle 4, a hole 13 may be provided in the injector mounting portion 1A as in the second embodiment, and the pipe line 5 may be connected to this hole 13.

According to this embodiment, since the exhaust gas having a high temperature is supplied to the air nozzle 4 before the intake valve is opened, the injected fuel can be easily vaporized.

[0032]

As described above, according to the present invention,
Since small-diameter droplets ejected from the injector are also smoothly transported to the center of the intake pipe, the amount of droplets adhering to the wall surface can be reduced, and fuel consumption and hydrocarbon component emissions can be reduced. Become.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a fuel supply device according to a first embodiment of the present invention.

FIG. 2 is a plan view of an air nozzle.

FIG. 3 is an air flow velocity distribution diagram along line AA in FIG.

FIG. 4 is a configuration diagram of a fuel supply device according to a second embodiment of the present invention.

FIG. 5 is a third embodiment of the present invention and is a system configuration diagram for sending air to an air nozzle.

FIG. 6 is a fourth embodiment of the present invention and is a system configuration diagram for sending exhaust gas to an air nozzle.

[Explanation of symbols]

 1 Intake Pipe 1A Injector Mounting Part 2 Injector 4 Air Nozzle 5 Pipeline 7,13 Hole 32 Compressor 33 Accumulator 34,43 Flow Control Valve 35,44 Control Device 40 Exhaust Pipe 41 Surge Tank 45 Pressure Sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Iwa Yokoyama 1168 Moriyama-cho, Hitachi-shi, Ibaraki Pref., Institute of Energy Research, Hiritsu Manufacturing Co., Ltd.

Claims (14)

[Claims] 1. In a fuel supply system for an internal combustion engine, which supplies fuel into an engine cylinder by injecting fuel into the intake pipe from an injector, the fuel injected from the injector is conveyed toward a central portion of the intake pipe. A fuel supply device for an internal combustion engine, characterized in that it is provided with means for blowing out a fluid that 2. An injection nozzle mounting portion is provided on the intake pipe,
In a fuel supply device for an internal combustion engine, which supplies fuel into an engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle attachment portion,
A fuel supply device for an internal combustion engine, comprising means for ejecting fluid in the same direction as the fuel injection direction and along the inner wall surface of the injection nozzle mounting portion. 3. The fuel supply system for an internal combustion engine according to claim 2, wherein the means includes an annular air nozzle arranged to face the injection nozzle of the injector, and the air nozzle has a plurality of air nozzles for blowing air. A fuel supply device for an internal combustion engine, characterized in that holes are formed along the circumferential direction. 4. The fuel supply system for an internal combustion engine according to claim 2, wherein the means includes an air blowout hole provided in the injection nozzle of the injector, and the hole is formed in plural along the circumferential direction. And a fuel supply device for an internal combustion engine. 5. An injection nozzle mounting portion is provided on the intake pipe,
In a fuel supply device for an internal combustion engine, which supplies fuel into an engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle attachment portion,
A fuel supply apparatus for an internal combustion engine, wherein a hole for ejecting a fluid that conveys fuel injected from the injector toward a central portion of the intake pipe is provided on an inner wall surface of the injection nozzle mounting portion. 6. An injection nozzle mounting portion is provided on the intake pipe,
In a fuel supply device for an internal combustion engine, which supplies fuel into an engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle attachment portion,
Suction means for sucking air from the intake pipe between the air cleaner and the throttle valve, storage means for temporarily storing the sucked air, and air in the storage means in the same direction as the fuel injection direction and the injection nozzle. A fuel supply device for an internal combustion engine, comprising: a means for blowing out in a direction along the inner wall surface of the mounting portion; and a control means for controlling the amount of air blown out. 7. An injection nozzle mounting portion is provided on the intake pipe,
In a fuel supply device for an internal combustion engine, which supplies fuel into an engine cylinder by injecting fuel into the intake pipe from an injector attached to the injection nozzle attachment portion,
Suction means for sucking air from the intake pipe between the air cleaner and the throttle valve, storage means for temporarily storing the sucked air, and the air in the storage means is jetted from the inner wall surface of the jet nozzle mounting portion. A fuel supply device for an internal combustion engine, comprising: a means for ejecting fuel along a moving direction of the fuel; and a control means for controlling the amount of air blown out. 8. The fuel supply device for an internal combustion engine according to claim 6 or 7, wherein the means starts supplying the air before fuel is injected from the injector, and continues after the fuel injection is completed. A fuel supply device for an internal combustion engine, characterized in that the fuel is supplied by the above-mentioned air. 9. The fuel supply device for an internal combustion engine according to claim 6 or 7, wherein the control means controls the amount of air blown out based on a crank angle, an intake air amount and an engine speed. Fuel supply device for internal combustion engine. 10. A fuel for an internal combustion engine, wherein an injection nozzle mounting portion is provided on an intake pipe, and fuel is injected into the engine cylinder by injecting fuel into the intake pipe from an injector mounted on the injection nozzle mounting portion. In the supply device, storage means for temporarily storing the exhaust gas from the exhaust pipe, and means for blowing out the exhaust gas in the storage means from the inner wall surface of the injection nozzle mounting portion along the moving direction of the injected fuel, A fuel supply device for an internal combustion engine, comprising: a control unit that controls the amount of exhaust gas blown out. 11. A fuel for an internal combustion engine, wherein an injection nozzle mounting portion is provided on an intake pipe, and fuel is injected into the engine cylinder by injecting fuel into the intake pipe from an injector mounted on the injection nozzle mounting portion. In the supply device, storage means for temporarily storing exhaust gas from an exhaust pipe, means for blowing out exhaust gas in the storage means from an inner wall surface of the injection nozzle mounting portion along a moving direction of the injected fuel, A fuel supply device for an internal combustion engine, comprising: a control unit that controls the amount of exhaust gas blown out. 12. The fuel supply system for an internal combustion engine according to claim 10 or 11, wherein the means starts supplying the exhaust gas before fuel is injected from the injector, and continues after the fuel injection is completed. A fuel supply device for an internal combustion engine, characterized in that the exhaust gas is supplied. 13. The fuel supply device for an internal combustion engine according to claim 10, wherein the control means is a crank angle,
A fuel supply device for an internal combustion engine, which controls an amount of exhaust gas blown out based on an intake air amount and an engine speed. 14. When fuel is supplied from the injector into the intake pipe to supply the fuel into the engine cylinder, a fluid is blown out in the fuel injection direction from the injector, and the injected fuel is used to eject the injected fuel. A method for supplying fuel to an internal combustion engine, characterized in that the fuel is conveyed toward the center of the intake pipe.