JPS5848772A - Fuel supplying device for fuel injection engine - Google Patents

Abstract

PURPOSE:To restrain the adhesion of fuel injected against the wall of suction air and improve the fuel consumption and the accelerating property of the engine by a method wherein the injection from a fuel injection valve is synchronized with a suction stroke, in the fuel injection engine having a suction port generating an eddy current in a combustion chamber. CONSTITUTION:Suction air from a suction tube 13 is flowed into the combustion chamber 5 from the opening of one end 3 of the suction port 1 along the tangential direction of the combustion chamber 5 and the eddy current having a direction shown by an arrow sign 24 is formed in the combustion chamber 5. The fuel injection valve 20 is attached to the suction tube 13 so that the injecting direction 21 thereof is directed in parallel to a standard surface 16 against the center of the opening of the other end 3. The center of the opening 23 of an exhaust port 22 for the combustion chamber 5 is deviated with respect to the standard surface 16. An ignition plug 25 is provided at the upper part of the combustion chamber 5. Fuel, injected from the injection valve 20, is tending to advance to a part of suction air, in which the flowing speed thereof is high, in the suction port 1, and is flowed so as to change the direction thereof toward the combustion chamber 5 by the suction air having a high flowing speed without adhering to the inner wall of the suction port 1, whereby the evaporation and atomization of the fuel may be promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply system for a fuel injection engine in which an intake boat is configured to generate a swirl within a combustion chamber.

The intake boat opens at one end that opens into the combustion chamber and at the side of the cylinder head to improve vaporization and exposure of the fuel by creating a vortex flow in the combustion chamber and preventing fuel from adhering to the inner wall of the intake boat. 1 and the other end, the opening at the other end of the intake boat is provided offset to one side with respect to a reference plane including the center point of the opening at one end of the intake boat and the central axis of the cylinder, and 2. Description of the Related Art Fuel supply systems for fuel injection engines are already known, in which an injection valve is provided near an intake port with its injection direction parallel to a reference plane. In this fuel supply system, fuel is injected from multiple fuel injection valves at the same time, and there is no intake flow to carry the injected fuel to the combustion chamber in cylinders where fuel is injected during strokes other than the intake stroke. In addition, the injected fuel adheres to the inner wall of the intake boat and becomes a predetermined amount of liquid mass that is sucked into the combustion chamber, resulting in deterioration of combustion, that is, an increase in the amount of unburned components in the exhaust gas. Furthermore, the fact that fuel is supplied to the combustion chamber along the inner wall of the intake boat increases the time it takes for the injected fuel to be sucked into the combustion chamber, deteriorating engine operating performance, especially responsiveness during acceleration. An object of the present invention is to suppress the adhesion of injected fuel to the intake wall in the above-mentioned fuel injection engine having a vortex-generating intake port, and to smoothly supply atomized fuel to the combustion chamber. An object of the present invention is to provide a fuel supply device.

In order to achieve this object, according to the fuel supply system of the present invention, fuel injection from each fuel injection valve is performed in synchronization with the intake stroke of the corresponding cylinder.

The present invention will be described in detail with reference to the drawings.

1 and 2, an intake port 1 is formed in a cylinder head 2, and at one end 3, an intake port 1 is formed in a cylinder head 2.
It opens into a combustion chamber 5 defined by a cylinder block 4, and opens into a side surface 7 of the cylinder head 2 at the other end 6.

A valve seat 8 is provided on the inner periphery of one end 3 , and an intake valve 9 that can be seated on the valve seat 8 is guided by a valve guide 10 . Intake pipe 13
is attached to the side of the cylinder head 2 and the intake port 1
connected to. The side surface 7 is formed perpendicular to a reference plane 16 that includes the center 14 of the circular opening at one end 3 and the central axis 15 of the combustion chamber 5 . By defining the position of the center 14 on the reference plane 16, the opening area of the one end 3 can be increased, and the intake efficiency can be improved. The opening at the other end 6 is offset to one side with respect to the reference plane 16, and the intake port 1 extends in a curved manner.

As a result, the intake air from the intake pipe 13 flows into the combustion chamber 5 from the opening at one end 3 of the intake port 1 in the tangential direction thereof, thereby forming a vortex flow in the direction of the arrow 24 within the combustion chamber 5. The fuel injection valve 2o has an intake port so that its fuel injection direction 21 is parallel to the reference plane 16 in the horizontal plane (FIG. 1) and toward the opening center of the other end 3 in the vertical plane (FIG. 2). It is attached to the intake pipe 13 near l. The center of the opening 23 of the exhaust port 22 to the combustion chamber 5 is the reference plane 1
It is deviated from 6. Ignition at the top of combustion chamber 5! A lug 25 is provided. Note that the intake boat that forms a vortex around the pulp stem of the intake valve 9 is called a helical port, and the intake boat 9 forms a vortex around the pulp stem of the intake valve 9.
A curved intake boat with an opening formed so that the position of the intake port is deviated is called a swirl port, and the intake port 1 shown in the drawings is a swirl port.

The fuel injected from the fuel injection valve 2o in the injection direction 21 is
In the intake port 1, the intake air flows toward the part where the flow is fast (curved outer part), and this injected fuel does not adhere to the inner wall of the intake port 1, and the intake air with a high flow velocity flows into the combustion chamber. It is flowed so as to change direction in five directions, promoting vaporization and dew.

FIG. 3 shows the fuel injection timing. "Suction" indicates the suction stroke, "pressure" indicates the compression stroke, "explosion" indicates the explosion stroke, "U exhaust" indicates the exhaust stroke, and τDC indicates the top dead center of the first cylinder. Fuel injection in each cylinder is performed during the intake stroke. Therefore, since fuel injection is performed when an intake air flow exists in the intake port 1, the injected fuel is guided to the cylinder 5 along the intake air flow without adhering to the inner wall of the intake boat 1.

FIG. 4 shows a fuel injection timing control device.

The discs 29 and 30 are fixed to the shaft of a power distributor connected to the crankshaft at a reduction ratio of 2, and four protrusions (in the case of a four-cylinder fuel injection engine) are formed on the outer periphery of the disc 29. One protrusion is formed on the outer periphery of. The electromagnetic pickups 31 and 32 detect the rotation of the disks 29 and 30, respectively, and the electromagnetic pickup 31 generates one pulse every time the crank angle elapses by tSO°, and the electromagnetic pickup 32 generates one pulse every time the crank angle changes by 720°. generates one pulse.

The shift register 33 consists of four D flip-flops 34 to 37 connected in series, the output of the electromagnetic pickup 31 is sent to the Cp (talok pulse) terminal of each solid flop 34 to 37, and the output of the electromagnetic pickup 32 is It is sent to the D terminal of the solid flop 34. The Q (output) terminal of the D flip-flop line or 37 is the first to fourth 18 of one cycle (72G'').
Each is maintained at 1 during the 0° period. The outputs of the D flip-flops 34 to 37 are connected to an AND circuit 38,
40,41.

39 respectively. The output ends of the AND circuits 3B to 41 are connected to solenoids 46 to 49 of the fuel injection valves of the first to fourth cylinders via drive elements 42 to 45. The solenoids 46 to 49 are connected to a predetermined DC voltage terminal 51 via a resistor 50. Electronic control unit 55 detects the intake air flow rate and engine rotational speed from inputs from air flow meter 56 and crank angle sensor 57, and sends fuel injection pulses to AND circuits 38 to 41.

During the intake stroke of the first to fourth cylinders, the outputs of the D flip-flops 34, 37, 35, and 36 are 1, respectively, and a fuel injection pulse is sent only to the solenoid of the fuel injection valve whose corresponding cylinder is in the intake stroke.

As described above, according to the present invention, ζ fuel is injected in synchronization with the intake stroke in a fuel injection engine having an intake port that generates a vortex in a combustion chamber, such as a swirl port or a helical port.

Therefore, the fuel injected parallel to the reference plane is smoothly supplied to the combustion chamber along the intake air flow without adhering to the curved inner wall. In this way, the fuel adhering to the inner wall of the intake port is prevented from forming a predetermined amount of liquid mass and being drawn into the combustion chamber, and the amount of unburned components in the exhaust gas is reduced.

Furthermore, since the fuel is quickly supplied to the combustion chamber without adhering to the inner wall of the intake boat, the responsiveness of the engine during acceleration and the like is improved. The improvement in engine responsiveness is particularly noticeable at low engine temperatures.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional plan view of the main part of a fuel injection engine having an intake port for generating vortex flow, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view of the fuel injection engine in each cylinder. A diagram showing the timing,
FIG. 4 is a diagram showing an embodiment of the fuel injection timing control device. 1...Intake port, 2...Cylinder head, 3...
・One end, 5... Combustion chamber, 6... Other end, 7... Side, 14... Center, 15... Central axis, 16... Reference plane, 20... Fuel injection valve , 33... Shift register, 38, 39, 40, 41... AND circuit patent applicant Toyota Motor Corporation h- Patent attorney Osamu Donaka Taira x7j. (Toto2 → Ri2/Ri angle

Claims (1)

[Claims] An intake boat has one end that opens into a combustion chamber and another end that opens into a side surface of a cylinder rad, and the opening at the other end of the intake boat includes a center point of the opening at one end of the intake boat and a central axis of the cylinder. The fuel injection valve is installed near the intake port with its injection direction parallel to the reference surface, and the fuel injection from each fuel injection valve is directed to the corresponding cylinder. A fuel supply device for a fuel injection engine, characterized in that the fuel supply is performed in synchronization with the intake stroke.