JPS63314363A - Fuel injection device - Google Patents

Abstract

PURPOSE:To improve the atomization of fuel by forming a plurality of fuel nozzles for separately injecting the fuel discharged from in injection hole of a fuel injector and a plurality of air nozzles corresponding to the fuel nozzles in such a manner that the injected fuel and air collide with each other. CONSTITUTION:A fuel injector 12 includes a cylindrical valve body 13 defining a valve chamber 14 therein and a valve shaft 15 fixing at its one end a spherical valve member 16. The valve member 16 is seatable on a valve seat 17 formed at an end of the valve chamber 14. A nozzle body 25 is so provided as to surround the valve body 13. An end wall 36 of the nozzle body 25 is formed with a plurality of fuel nozzles 37 arranged concentrically and inclined toward the center of the nozzle body 25. Ah outer shell 31 connected to an air supply pipe 33 is engaged with the outer periphery of the nozzle body 25 in such a manner as to define a plurality of air nozzles 40 therebetween corresponding to the fuel nozzle 37, so that the fuel injected from the fuel nozzles 37 and the air injected from the air nozzles 40 may collide with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The fuel injection device of the present invention is mainly used to supply fuel to automobile engines.

Controlled fuel is injected into the intake pipe according to the amount of intake air or other engine conditions.

Fuel injection devices that mix with intake air and supply it to an engine are well known.

The fuel flow rate can be appropriately controlled by opening and closing the injection valve using pulse signals sent from the electronic control unit 5. However, it is possible to properly atomize the fuel injected into the intake pipe and to make it into the intake air. It is necessary to improve the mixability with the pipe and prevent it from adhering to the pipe wall. To achieve this, 1. For example, air nozzle ports are arranged in an annular manner surrounding the fuel nozzle port that injects fuel into the intake pipe, and air is sucked out from the air nozzle port using the differential pressure before and after the aperture to create fuel mist. It is disclosed in Japanese Patent Publication No. 52-33254 that this can be carried out.

However, according to 伪V(17) disclosed in the above-mentioned publication, the fuel is surrounded by air and flows, so if
Not only does it require a large amount of air to cause heat, but the efficiency is not necessarily high.

Since the differential pressure is large in the low opening range of the throttle valve, a large amount of air is sucked in even though the fuel flow rate is small, causing problems such as diluting the air-fuel mixture.

The present invention was invented in order to solve these problems, and provides a fuel injection device that can atomize fuel well using air at a low temperature.

Means for Solving the Problems The present invention provides a plurality of fuel nozzle ports for branching and injecting fuel emitted from an injection hole of an injection valve that is driven to open and close by a pulse signal depending on the engine state; A plurality of air nozzle ports arranged corresponding to each of the fuel nozzle ports, and an air conduit connected to the air nozzle ports and having an air control valve that is driven to open and close in synchronization with the injection valve. In order to solve the above problem, the corresponding fuel nozzle port and air nozzle port are opened so that the injected fuel and air collide with each other.

The operational injection valve is driven to open and close according to the duty ratio of the pulse signal to seal the fuel. The fuel that has exited the injection port is injected into the intake road in a branched manner from the outlet of a plurality of fuel nozzles, and at this time, air controlled by an air control valve that opens and closes in synchronization with the injection valve is supplied to each fuel. The air is ejected in a branched state from the corresponding air nozzle port and collides with the fuel.

Effects of the Invention According to the present invention, the fuel exiting the injection port of the injection valve is injected 11 times in a branched state from multiple fuel nozzle ports, and the air is synchronized with the fuel from the corresponding air nozzle port. Since it collides with the ejected air, the amount of air corresponding to the fuel flow rate is ejected in a timely manner to achieve good atomization of the fuel, and even when the fuel flow rate is low, it is supplied to the engine without worrying about diluting the mixture. It is possible.

Example Examples of the present invention will be described based on the drawings.

Referring to FIG. 1, a throttle valve 4 position sensor 5. A pressure sensor 6 is provided to detect the intake pipe pressure, an oxygen sensor 8 is provided to the exhaust pipe 7 to detect the oxygen concentration in the exhaust gas, and a rotation speed sensor 9 is provided to detect the rotational speed of the engine 2 and the cooling water temperature. ．． Temperature sensors 10 are provided and these sensors emit. ! The air signal is input to the electronic control unit 11. The computer 11 determines an appropriate amount of fuel to be supplied according to the state of the engine 2 based on the electrical signal, and sends a necessary pulse signal to the injection valve 12 provided in the intake pipe 3 downstream of the throttle valve 4 to drive it to open and close. .

2, the injection valve 12 has a cylindrical valve body 13,
A valve shaft 15 fitted into a valve chamber 14 formed inside the valve shaft 15
It has a spherical valve body 16 fixed to the tip of the valve body 14, and a valve seat 17 disposed at the tip of the valve chamber 14 facing the valve body 16. 14
The fuel entering the valve enters the injection hole 1 formed in the valve seat 17 when the valve is opened.
It erupts through 9. The valve shaft 15 has its base end fixed to a plunger 21 of a solenoid 20 which is a driving part of the injection valve 12, and responds to a pulse signal supplied to an electromagnetic coil 22 by
As the magnetic pole piece 23 is repeatedly excited and demagnetized, the plunger 21 is reciprocated by the magnetic force of the magnetic pole piece 23 and the spring force of the return spring 24, causing the injection valve 12 to perform an opening/closing operation.

Referring to FIG. 1.2, the nozzle body 2 surrounds the valve body 13.
5 are provided, and a fuel conduit 27 opens into a fuel chamber 26 formed by these annular gaps. fuel tank 2
8 is pressurized by a fuel pump 29, adjusted to a predetermined pressure by a fuel pressure regulator 30, and then sent through a fuel conduit 27 to a fuel chamber 26. It enters the valve chamber 14 via the inlet 18. Further, an outer body 31 is provided surrounding the nozzle body 25, and an air conduit 33 opens into an air chamber 32 formed by these annular gaps.

This air line 33 has an air pump 34 and an electromagnetically driven air control valve 35 and is connected to the intake line 3 upstream of the throttle valve 4 .

Therefore, the air that has passed through the air cleaner 1 is pressurized by the air pump 34, controlled by the air control valve 35, and introduced into the air chamber 32. The air control valve 35 is controlled by a pulse signal sent from the electronic control unit 11 so as to open and close in synchronization with the opening and closing operations of the injection valve 12.

Referring to FIG. 2.3, the valve seat 17 at the tip of the valve body 13 is tightly fitted into the nozzle body 25, and the tip wall 36 of the nozzle body 25 facing the injection hole 19 has a circular shape. A plurality of fuel nozzles 37, for example, six fuel nozzles 37, are arranged at approximately equal intervals in the circumferential direction on the top.
The fuel nozzle 37 is inclined toward the circumference and center of the nozzle body 250. Also.

A groove corresponding to each of the fuel nozzles 37 is provided along the inclined outer surface 38 of the tip 36, and this groove is formed in the outer body 3.
An air nozzle 40 is formed by being covered with an inclined inner circumferential surface 39 having the same inclination angle as the inclined outer surface 38 formed at the tip opening of the air nozzle 1 . This air nozzle 40 is also inclined toward the circumferential direction and toward the center, and a fuel nozzle port 3 is formed on the tip surface of the nozzle body 25 and the external body 31 that are aligned on one plane.
7 m and an air nozzle opening of 40 m are open.

Then, the corresponding fuel nozzle 037a and air nozzle port 4
0m is opened in different directions as indicated by arrows F and A so that the fuel and air injected from each injection hole collide with each other, and the fuel ejected from the injection hole 19 passes through the fuel nozzle 37 and exits the fuel nozzle. The air in the air chamber 32 passes through the air nozzle 40 and is ejected from the air nozzle 040m in a branched state.

Note that depending on the inclination angle of the inclined surface on which the air nozzle 40 is provided and the position and relationship of the fuel nozzle 37,
7a can be set to either positive pressure or negative pressure, and the spreading angle of the mixture of fuel and air can be changed. Alternatively, the fuel nozzle 37 may be arranged outside the air nozzle 40.

[Brief explanation of the drawing]

No. xEm is a layout diagram of an engine system equipped with the device of the present invention;
FIG. 2 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 3 is an end view of the nozzle body. 2...Engine, 3...Intake pipe line, 1
1...Electronic control unit), 12...
... Injection valve, 19 ... Injection hole, 25 ...
・Nozzle body, 31... Outer body, 33...
・Air conduit, 35...Air control valve, 37...
...Fuel nozzle, 37a...Fuel nozzle opening, 40...Air nozzle, 40m...
Air nozzle mouth.

Claims (1)

[Claims] A plurality of fuel nozzle ports are arranged corresponding to each of the fuel nozzle ports, and a plurality of fuel nozzle ports are arranged so as to branch and inject the fuel emitted from the injection hole of the injection valve, which is driven to open and close by a pulse signal according to the engine condition. A plurality of air nozzle ports, an air conduit having an air control valve that is driven to open and close in synchronization with the injection valve and connected to the air nozzle ports, the fuel nozzle port and the air nozzle port corresponding to each other. A fuel injection device characterized by having an opening so that injected fuel and air collide with each other.