JPH0111974Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a fuel injection device.

Generally, the fuel metering section of a fuel control actuator having a fuel metering section and the fuel injection valve must be connected through a path as short as possible. In other words, in an automobile engine that accelerates and decelerates rapidly and requires a quick response, even if the fuel control actuator operates, if the distance to the fuel injection valve is long, it will take time for fuel to be injected. The time delay determines the quality of the acceleration feeling. In general, when the engine decelerates, in conventional systems, even if the fuel metering part closes immediately, the fuel remaining in the pipe leading to the fuel injection valve flows out into the intake pipe.
This resulted in a large amount of HC, which was an undesirable drawback in terms of exhaust gas control.

In order to solve the above-mentioned drawbacks, the present invention provides a fuel injection valve directly connected to the fuel metering section of the fuel control actuator, and also integrates the actuator and the fuel injection valve into a common housing to form a fuel supply path. To provide a fuel injection valve that can improve engine response because the fuel path is short even when the pressure inside the intake pipe changes suddenly and it is necessary to change the fuel pressure in a short time.

An embodiment of this invention shown in the figure will be described below.

In the figure, 1 is a body connected to an intake pipe of the engine, and 2 is a pump that supplies fuel from a fuel tank 4 to a fuel control actuator 5 through a filter 3.
6 is a housing to which a permanent magnet 7 is attached. 8 is a movable piece having an electromagnetic coil 9. The electromagnetic coil 9, the movable piece 8, the permanent magnet 7, and a portion of the casing 6 constitute an electromagnet section. The movable piece 8 also has a shaft 11 and a tapered portion 12 at its tip.
has a gap 28 between the opposing portions of the housing 6, and fuel is metered in this gap. This gap 28 and the tapered portion 12 of the shaft 11 constitute a fuel metering portion. Reference numeral 13 denotes a bearing portion that is provided in a part of the housing 6 and supports the shaft 11. The other end of the movable piece 8 has a measuring shaft 14, its bearing 15, and a brush 16 for measuring the position of the movable piece 8, and this brush 16 slides on a resistor 17 to measure the change in resistance value by a computer. It is configured so that it can be sent to 36. 18 is a fuel outlet connected to the fuel tank 4. 10 is a spring that constantly presses the movable piece 8. 19 is a fuel pressure regulator, which has a valve part 22 glued to a diaphragm 20, and a spring 2
1, the valve portion 22 is integrally formed with the housing 6 so as to close the passage 25. This passage 25 forms a bypass path. That is, pump 2
When the discharge pressure of the pump exceeds a specified value or the pressure of the body 1 becomes low, the diaphragm 20 moves upward against the pressure of the spring 21 to open the valve portion 22, and the fuel from the pump 2 flows through the fuel inlet 23. , aisles 24, 25
27 is a passage communicating between the fuel inlet 23 and the fuel metering section, and 29 is attached to the housing 6 so as to be directly connected to the fuel metering section of the actuator 5. The fuel injection valve is composed of a valve part 32 and a spring 31, and the fuel metered in the gap 28 of the actuator 5 enters a chamber 30, which opens the valve part 32 and injects the fuel into the intake pipe. 33 is a throttle valve attached to the intake pipe, 34 is an engine driven by the fuel from the fuel injection device, 35 is an oxygen sensor attached to the exhaust pipe of this engine, and 37 is an upstream side of the intake pipe of the engine. This is an air amount sensor attached to the engine to measure the amount of intake air.

Next, the operation of the embodiment of this invention will be explained. When the engine rotates, the amount of intake air from the air amount sensor 37 is converted into an electrical signal and input to the computer 36. Since the computer 36 flows a current corresponding to the intake air amount to the electromagnetic coil 9 of the fuel control actuator 5, an electromagnetic force is generated between the electromagnetic coil 9 and the permanent magnet 7, and the electromagnetic coil 9 moves to a specified position. This position becomes the position of the brush 16 due to the movement of the measuring shaft 14 and is detected as a change in resistance value, so the computer 36 stops the shaft 11 at a position commensurate with the amount of air.
Therefore, the gap 28 is maintained at a specified value and fuel is injected from the fuel injection valve 29. Since the discharge capacity of the pump 2 is set to be considerably larger than the amount of fuel required by the engine 34, a large amount of fuel is transferred to the passages 24, 25, 2.
6 to the fuel tank 4 from the fuel outlet 18. Considering the state in which the engine accelerates rapidly, the current in the electromagnetic coil 9 increases rapidly, and the taper portion 12 of the shaft 11
moves rapidly to the left. Along with this, the gap 28
Since the opening area becomes larger, a large amount of fuel is injected from the valve portion 32 through the flow chamber 30 into the intake pipe of the engine.

Furthermore, when the throttle valve 33 suddenly opens, the air pressure inside the body 1 temporarily decreases and an unnecessarily large amount of fuel tries to come out from the injection valve 29, but the diaphragm 20 quickly senses this and the passage 24, Bypass fuel is increased through 25 to limit the fuel flowing through the injector 29.

In addition, in this embodiment, the fuel control actuator 5, the fuel injection valve 29, and the fuel pressure regulator 19
Since these are integrally constructed in a common housing 6, each fuel passage can be communicated over the shortest distance, making it compatible with automobile engines with quick response, and yet This solves the problem of large amounts of exhaust gas such as HC being emitted when the engine decelerates.Furthermore, when this fuel injection device is installed on the engine, the fuel piping is compact, so the work is kept to a minimum. You can do it with

Incidentally, in the above example, the fuel control actuator 5, the fuel injection valve 29, and the fuel pressure regulator 19 are each integrally configured in the common housing 6, but
The fuel metering section of the fuel control actuator 5 and the fuel injection valve 29 may be directly connected, and the fuel control actuator 5 and the fuel injection valve 29 may be integrally configured in a common housing 6.

As described above, this invention has a computer that operates according to the output of an air amount sensor that is installed upstream of the engine's intake pipe and emits an electric signal corresponding to the intake air amount, and uses an electric continuous injection method. In an indirect injection type fuel injection device that injects fuel into the intake pipe of an engine, the fuel metering section of the fuel control actuator and the fuel injection valve are directly connected, and the fuel control actuator and the fuel injection valve are integrated in a common housing. Because of this structure, each fuel passage can be made extremely short, so in applications such as automobile engines that have rapid acceleration and deceleration and require a quick response, it is possible to use engines that can quickly change the fuel amount and have a good response. In addition, the device can be made smaller and lighter, and the fuel piping after the engine is installed can be made extremely short, making it possible to improve vehicle safety and reduce assembly man-hours.
Moreover, the fuel pressure is constant regardless of the fuel flow rate, and since it is equipped with an injection valve, the fuel atomization is good even at low speeds with a small amount of intake air.Furthermore, because it uses an electric continuous injection method, the fuel passage can be shortened. As a result, a uniform air-fuel mixture can be obtained, which has advantages such as less variation in the cylinder mixture ratio and improved engine output.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of this invention. In the figure, 1 is the body, 2 is the pump, 4 is the fuel pump, 5 is the fuel control actuator, 7 is the permanent magnet,
8 is a movable piece, 9 is an electromagnetic coil, 11 is a shaft, 12 is a tapered part, 13 is a bearing part, 16 is a brush, 17 is a resistor, 18 is a fuel outlet, 19 is a fuel pressure regulator, 20 is a diaphragm, and 21 is a spring. , 22 is a valve part, 23 is a fuel inlet, 24 and 25 are bypass passages, 26 is a chamber, 28 is a gap, 29 is a fuel injection valve,
33 is a throttle valve, 34 is an engine, 36 is a computer, and 37 is an air amount sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A computer that operates according to the output of an air flow sensor that is installed on the upstream side of the intake pipe of an engine and emits an electrical signal corresponding to the amount of intake air; A fuel control actuator having an electromagnet section that operates and a fuel metering section that is connected to the electromagnet section and controls the amount of fuel discharged by moving a movable body of the electromagnet section, and a fuel supply pressure to the fuel metering section of the actuator. a fuel pressure regulator for controlling the actuator, and a fuel injection valve that is directly connected to the fuel metering section of the actuator and that continuously injects fuel from the fuel metering section into the intake pipe of the engine, the actuator and the fuel injection valve A fuel injection device that is integrated into a common housing. (2) The fuel injection device according to claim (1), characterized in that the fuel pressure regulator is integrally provided in the housing together with the actuator and the fuel injection valve.