JP2003065181A - Fuel piping device and port injection system using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel piping device and a port injection system using the same capable of improving a direct hit rate of fuel atomization against an intake valve, and mounting a fuel injection valve. SOLUTION: The fuel injection valve 110 is housed in a holder part 120. An insertion part 122 to be inserted in an engine is provided on a tip end of the holder part 120. Fuel piping 130 is mounted on the holder part 120. A center axis of the holder part 120 is arranged by inclining to an outer diameter center axis of the insertion part 122.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel piping system for accommodating a plurality of fuel injection valves and supplying fuel to the fuel injection valves and a port injection system using the same, and more particularly to a side feed type fuel injection system. The present invention relates to a fuel piping device suitable for use in a valve and a port injection system using the same.

[0002]

2. Description of the Related Art Multipoint injector (MPI)
In a system such as a system including a fuel injection valve for each cylinder of a multi-cylinder internal combustion engine, a fuel piping device is used in advance in order to improve the mountability of the fuel injection valve to the engine. The fuel transfer device is provided with a holder portion for accommodating the fuel injection valve and a pipe for supplying fuel to the fuel injection valve accommodated in the accommodating portion. An insertion portion, which is a portion to be inserted into the engine, is formed at the tip of the holder portion.

Here, in the conventional fuel piping system,
For example, as described in Japanese Patent Application Laid-Open No. 9-32689, the holder portion is arranged coaxially with the outer diameter center axis of the insertion portion. Therefore, the fuel injection valve housed in the holder portion is also arranged coaxially with the outer diameter center axis of the insertion portion.

[0004]

However, in the above-described conventional fuel piping system, since the fuel injection direction is fixed, the fuel intake valve is changed when the engine layout or the like is changed or limited. It has become clear that the direct hit rate to the car may change, and it may not meet the prescribed responsiveness and exhaust gas regulations. Particularly in recent automobiles, the space in the engine room is becoming narrower, while the types of accessories around the engine tend to increase.Therefore, due to the restrictions on the installation space for engine accessories, the installation space for the fuel piping system is also limited. Will be. In a certain automobile, a top-feed type fuel injection valve was used in the past, but when an attempt was made to use a side-feed type fuel injection valve for the purpose of improving durability at the time of a collision, engine auxiliary equipment ( For example, since the alternator has to be arranged in the vicinity of the fuel piping device, there has been a case where the holder and the insertion part have to be arranged so as to be displaced from their original positions. In this case, the fuel spray sprayed from the fuel injection valve attached to the holder portion is originally sprayed toward the center of the intake valve, and the direct hit rate of the fuel spray to the intake valve should be 100%. It has become clear that the direct hit rate against 0 may be unavoidable. It has been found that a decrease in the direct hit rate causes problems such as a decrease in responsiveness, a decrease in acceleration performance, and an increase in the concentration of HC in exhaust gas.

It is an object of the present invention to provide a fuel piping device in which a direct injection rate of fuel spray to an intake valve can be improved and a fuel injection valve can be attached, and a port injection system using the same.

[0006]

(1) In order to achieve the above object, the present invention accommodates a fuel injection valve and
In a fuel piping device having a holder part having an insertion part to be inserted into an engine at its tip, and a fuel pipe supplying fuel to the holder part, the central axis of the holder part is
The insertion portion is arranged so as to be inclined with respect to the central axis of the outer diameter. With this configuration, it is possible to improve the direct impact rate of the fuel spray on the intake valve and attach the fuel injection valve.

(2) In order to achieve the above object, according to the present invention, a fuel injection valve is accommodated, and a holder portion having an insertion portion to be inserted into an engine at its tip and fuel is supplied to the holder portion. And a fuel injection valve housed in the holder part, wherein the center axis of the fuel injection valve is arranged to be inclined with respect to the outer diameter center axis of the insertion part. Is. With this configuration, it is possible to improve the direct impact rate of the fuel spray on the intake valve and attach the fuel injection valve.

(3) In order to achieve the above object, according to the present invention, a fuel injection valve is housed, and a holder portion having an insertion portion to be inserted into an engine at a tip thereof and fuel is supplied to the holder portion. A fuel pipe apparatus having a plurality of holder portions, and a fuel injection valve housed in each of the plurality of holder portions. With respect to the central axis
The central axis of the adjacent fuel injection valve is tilted. With this configuration, it is possible to improve the direct impact rate of the fuel spray on the intake valve and attach the fuel injection valve.

(4) In order to achieve the above object, according to the present invention, a fuel injection valve is housed, and a holder portion having an insertion portion to be inserted into an engine at a tip thereof and fuel is supplied to the holder portion. In the fuel piping device having the fuel pipe, the tip end plane of the fuel injection valve housed in the holder portion and the tip end plane of the holder portion are not parallel to each other. With this configuration, it is possible to improve the direct impact rate of the fuel spray on the intake valve and attach the fuel injection valve.

(5) In order to achieve the above object, according to the present invention, a fuel injection valve is accommodated, and a holder portion having an insertion portion to be inserted into an engine at a tip thereof and fuel is supplied to the holder portion. In the fuel pipe device having a fuel pipe for the fuel injection valve, the holder portion has a tip portion provided with a protrusion portion that protrudes forward of the fuel injection valve housed in the holder portion. It is configured to be non-uniform around the tip of the nozzle. With this configuration, it is possible to improve the direct impact rate of the fuel spray on the intake valve and attach the fuel injection valve.

(6) In order to achieve the above object, according to the present invention, a fuel injection valve is accommodated, and a holder portion having an insertion portion to be inserted into an engine at a tip thereof and fuel is supplied to the holder portion. In a port injection system in which a fuel pipe device having a fuel pipe that is installed is attached to an inserted portion of an engine, a central axis of the fuel injection valve is arranged to be inclined with respect to a central axis of the inserted portion. With this configuration, it is possible to improve the direct impact rate of the fuel spray on the intake valve and attach the fuel injection valve.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The configuration of a fuel piping system according to an embodiment of the present invention will be described below with reference to FIGS. First, the system configuration of an internal combustion engine including the fuel piping device according to the present embodiment will be described with reference to FIG. FIG. 1 is a system configuration diagram of an internal combustion engine including a fuel piping device according to an embodiment of the present invention.

The air sucked from the air cleaner 10 is
It is sucked into the combustion chamber 32 of the engine 30 via the intake passage 20 composed of the throttle body 22, the intake manifold 24 and the like. Cylinder head 3 of engine 30
4, an intake valve 36 and an exhaust valve 38 are provided.

The intake manifold 24 is attached to the cylinder head 34. An injector 110 attached to the fuel piping system 100 is supported on the upper side of the intake manifold 24. Fuel piping device 1
00, the injector 110, and the intake manifold 24 constitute a port injection system for injecting fuel into the intake port.

The fuel stored from the fuel tank is
The fuel is pumped up by the fuel pump, passed through the fuel filter, adjusted to a predetermined pressure by the pressure regulator, and supplied to the fuel piping system 100. As will be described later, a holder portion for accommodating as many injection valves as the number of cylinders of the engine is integrally connected to the fuel piping device. An injector 110 is attached to each holder part, and the fuel supplied to the fuel piping device 100 is distributed to each injector 110. The front end of the injector 110 is the intake manifold 24.
The injector 110 is arranged so that the fuel spray directed toward the intake valve 32 of the cylinder head 30 and sprayed from the injector 110 directly hits the center of the intake valve 36.

The throttle body 22 is provided with a throttle valve 22A which rotates in conjunction with an accelerator pedal. By rotating the slot valve 22A, the amount of air taken into the engine 30 can be changed. The opening of the throttle valve 22A is detected by the throttle sensor 22B, and the control unit 5
It is taken into 0.

Air cleaner 10 and throttle body 2
A hot wire air flow meter 40 is provided in the intake passage between the two. The air flow meter 40 measures the amount of air taken into the engine 30 via the intake passage 20, and the measured amount of air is taken into the control unit 50.

An O 2 sensor 62 for measuring the oxygen concentration in the exhaust gas is attached to the exhaust passage 60 of the engine 30. The oxygen concentration measured by the O2 sensor 62 is taken into the control unit 50. Also,
The engine 30 includes a water temperature sensor 64 for detecting the cooling water temperature.
Is attached. The cooling water temperature detected by the water temperature sensor 64 is taken into the control unit 50.

The control unit 50 controls the intake air amount measured by the air flow meter 22, the throttle opening detected by the throttle sensor 22B, the cooling water temperature detected by the water temperature sensor 64, the cooling water temperature detected by the O2 sensor, The fuel injection amount is obtained based on the engine speed, and the injector 110 is controlled to spray a predetermined fuel. Further, the control unit 50 controls the ISC valve 42 to control the idle speed.

Next, the overall structure of the fuel piping system according to the present embodiment will be described with reference to FIGS. Figure 2
FIG. 1 is a plan view showing the overall configuration of a fuel piping device according to an embodiment of the present invention. FIG. 3 is a side view of a partial cross-section showing a state in which the fuel piping device according to the embodiment of the present invention is attached to the engine.

As shown in FIGS. 2 and 3, the fuel piping system 100 according to this embodiment has holder parts 120A and 120A.
B, 120C, 120D and fuel pipes 130, 130
A, 130AB, 130BC, 130CD. One end of the fuel pipe 130 serves as the fuel inlet Fin, and the other end is fixed to the side wall of the holder 130D. The ends of the fuel pipes 130CD are
It is fixed to the holder parts 120C and 120D. The end portions of the fuel pipes 130BC are respectively attached to the holder portion 120.
It is fixed to B and 120C. Fuel pipe 130AB
The end portions of are fixed to the holder portions 120A and 120B, respectively. One end of the fuel pipe 130A is fixed to the holder 120A, and the other end is fixed to the pressure regulator 180. The pressure regulator 180 has a fuel outlet Fout.
Holder parts 120A, 120B, 120C, 120D,
Fuel pipes 130, 130A, 130AB, 130B
The C and 130CD are fixed by brazing or the like.

The fuel flowing into the fuel pipe 130 through the fuel inlet Fin is held by the holder 120D and the fuel pipe 130C.
D, holder part 120C, fuel pipe 130BC, holder part 120B, fuel pipe 130AB, holder part 120
The pressure is adjusted by A, the fuel pipe 130A, and the pressure regulator 180, flows out from the fuel outlet Fout, and is circulated to the fuel pump.

Holder portions 120A, 120B, 120C,
120D includes injectors 110A,
110B, 110C, 110D are inserted, respectively,
The caps 140A, 140B, 140C, 140D are screwed and fixed.

The fuel pipe 130 has a stay 15 attached to it.
0 is fixed. A stay 150AB is fixed to the fuel pipe 130AB. Fuel pipe 130CD
A stay 150CD is fixed to the. Stay 15
0, 150AB, and 150CD are used to fix the fuel piping device 100 to an engine or the like, respectively. The stay 150AB is also used to hold the fuel pipe 130.

Further, as shown in FIG.
Inserted portions 122A, 122B, 122C and 122D are integrally formed at the respective tips of A, 120B, 120C and 120D. On the other hand, the intake manifold 24 of the engine has a portion to be inserted 24A, 24B, 24.
C and 24D are formed. Insertion part 122A, 122
B, 122C, 122D are inserted parts 24A, 24B, 24C, 24D of the intake manifold 24, respectively.
Inserted in.

Here, in this embodiment, as shown in FIG. 3, the insertion portions 122A, 122B, 122C, 12 are inserted.
With respect to the outer diameter center axis of 2D, the holder parts 120A, 120
If the angles formed by the center axes of the inner diameters of B, 120C, and 120D are θ1, θ2, θ3, and θ4, respectively, θ1 = θ2
= 0 ° and θ3 = θ4 = 8 °. That is,
Holder parts 120A, 120B and insertion parts 130A, 13
2 cylinders composed of 0B are the inserted portion 2 on the engine side.
Since the central axes of 4A and 24B are directed toward the center of the intake valve, the insertion portions 130A and 130B and the holder portion 120
A and 120B are coaxial, and the inserted portion 2 of the engine, respectively.
It coincides with the central axes of 4A and 24B. On the other hand, the inserted portions 24C and 24D have intake valves at positions displaced to the right in the figure because their central axes cannot aim at the intake valve center due to the layout limitation on the engine. On the fuel pipe, the insertion part 122
C and 122D are inserted parts 24C and 24D on the engine side.
The pipes for four cylinders cannot be detached coaxially unless they are coaxial. Therefore, the holder portion 120 above it
In order to direct the central axes of C and 120D and the injector toward the center of the intake valve, the holder parts are fixed at angles θ3 and θ4 formed by the central axis of the inner diameter of the holder parts 120C and 120D with respect to the central axis of the outer diameter of the insertion parts 122C and 122D. It is designed to be tilted at an arbitrary angle with respect to the insertion portion.

The inclination angles θ3 and θ4 are determined as follows. That is, in the example shown in FIG. 3, reference numerals 36A, 36B, 36C and 36D respectively indicate the central position of the intake valve 36. The injectors 110A, 110B, 110 inserted into and supported by the holders 120A, 120B, 120C, 120D, respectively.
C, 110D central axis (this is the holder portion 120A, 1
(Equivalent to the inner diameter center axis of 20B, 120C, 120D)
Is the center position 36A, 36B, 36 of the intake valve 36.
It matches C and 36D. That is, the central positions 36A, 36B, 36C, 36D of the intake valve 36
Injectors 110A, 110B, 11
By spraying fuel from 0C and 110D, the direct hit rate of fuel spray to the intake valve 36 is set to 100%.

Here, for example, in order to set θ4 to 0 °, as shown by the alternate long and short dash line in FIG.
The holder part may be installed at the position. However, because of the engine layout, when the auxiliary machine SM, for example, the alternator has to be installed at the position shown by the broken line in FIG. 3, the auxiliary machine SM and the holder section 120D ′ interfere, so the holder section 120D ′ should be installed. It cannot be done. Therefore, the holder portion 120D is attached at a position where it does not interfere with the auxiliary machine SM, and the holder portion 120D is provided with an inclination θ4, so that the injector 110 supported by the holder portion 120D is supported.
The intake valve direct hit rate of the fuel sprayed from D is set to 100%. The same applies to the holder portion 120C.

Next, with reference to FIG. 4, the structure of the main part of the fuel piping system according to the present embodiment will be explained. FIG. 4 is an enlarged cross-sectional view showing the main configuration of the fuel piping system according to the embodiment of the present invention.

Fuel pipes 130BC and 130CD are fixed to the side wall of the holder portion 120C. Holder part 1
An injector 110C is inserted inside the 20C,
By fixing the cap 140C to the holder 120C, the injector 110C is supported by the holder 120C. The nozzle portion 110C-N at the tip of the injector 110C is inserted inside the insertion portion 122C integrally formed at the tip of the holder portion 120C. The injector 110C is a side-feed type, in which fuel is today curbed from the side. A filter 112F is provided on the side surface of the injector 110C. The fuel flowing from the fuel pipe 130CD along the flow F1 is supplied to the inside through the filter 112F of the injector 110C. Excess fuel is supplied from fuel pipe 130CD to adjacent injectors along flow F2.
Here, in order to direct the central axes of the holder 120C and the injector 110C to the center of the intake valve, the insertion portion 122
The holder portion 120C is inclined with respect to the outer diameter center axis of C by an arbitrary angle θ3 with respect to the insertion portion 122C, such as an angle θ3 formed by the inner diameter center axis of the holder portion 120C. θ3 is, for example, 8 °.

Further, the fuel pipes 130BC and 130CD
Let L4 be the central axis of L1 and L1 be the axis orthogonal to the central axis of the injector 110C, the axes L4 and L1 are substantially parallel. In addition, the nozzle portion 110 of the injector 110C
The line parallel to the tip plane of C-N is L3, and the holder 120
Let L2 be a line parallel to the distal end plane of the insertion portion 122C of C,
Assuming that the inclinations of the axes L4 and L1 are θ14 and the inclinations of the lines L3 and L2 are θ23, the inclination θ23 is almost the same as the inclination θ14. This inclination θ23 is determined by the positional relationship of the intake valves. In addition, as a result of the above configuration, the tip end plane of the insertion portion 122C of the holder 120C and the nozzle portion 110C-N of the injector 110C.
And the tip end planes are not parallel to each other.

Further, the tip end of the holder 120C has a protrusion 122D which protrudes from the tip of the nozzle 110C-N of the injector 110C. Protrusion 122D
Of the nozzle portion 110C-N is
Around the tip of 10C-N, it is non-uniform. That is, at the position on the left side of the drawing, the protrusion 122
The protrusion amount of D with respect to the nozzle portion 110C-N is D1, whereas the protrusion amount of the protrusion portion 122D of the nozzle portion 110C-N is D1.
Is the amount of protrusion D2, the amount of protrusion D1 and the amount of protrusion D
2 is not equal, and the protrusion 122D is formed on the circumference, but the protrusion amount is not uniform.

As described above, in this embodiment, even if the inserted portion on the engine side does not face the intake valve,
The injection valve and the holder portion can face the center of the intake valve, and the valve direct hit rate of spray can be 100%. This makes it possible to obtain a predetermined transient response, improve acceleration, and reduce HC by 50% to satisfy exhaust gas regulations.

Further, even if two of the four cylinders have different directions, the insertion portions of the pipes are all on the same axis, so they can be attached and detached even if they are integrated, and the man-hours and cost are kept low. Is possible. In addition, by changing the angle of the holder according to the pitch of the intake valve of the engine,
There is a cost advantage because it can be installed and the direct hit rate of the valve can be changed, and it can be handled without making other changes.

[0035]

According to the present invention, the direct impact rate of fuel spray on the intake valve can be improved and the fuel injection valve can be attached.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an internal combustion engine including a fuel piping device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the overall configuration of a fuel piping device according to an embodiment of the present invention.

FIG. 3 is a side view of a partial cross section showing a mounting state of the fuel piping system according to the embodiment of the present invention on an engine.

FIG. 4 is an enlarged cross-sectional view showing a configuration of a main part of a fuel piping device according to an embodiment of the present invention.

[Explanation of symbols]

22 ... Throttle body 24 ... Intake manifolds 24A, 24B, 24C, 24D ... Inserted part 30 ... Engine 36 ... Intake valve 100 ... Fuel piping device 110, 110A, 110B, 110C, 110D ... Injectors 120A, 120B, 120C, 120D ... Holder parts 130, 130A, 130AB, 130BC, 130C
D ... Fuel pipes 140A, 140B, 140C, 140D ... Caps 150, 150AB, 150CD ... Stay 180 ... Pressure regulator

Claims (6)

[Claims] 1. A holder part for accommodating a fuel injection valve and having at its tip an insertion part to be inserted into an engine,
A fuel piping device having a fuel pipe for supplying fuel to the holder part, wherein the central axis of the holder part is arranged to be inclined with respect to the central axis of the outer diameter of the insertion part. . 2. A holder part for accommodating a fuel injection valve and having at its tip an insertion part to be inserted into an engine,
In a fuel piping device having a fuel pipe for supplying fuel to the holder portion, a fuel injection valve housed in the holder portion is provided, and a central axis of the fuel injection valve is an outer diameter central axis of the insertion portion. A fuel piping device, which is arranged so as to be inclined with respect to one another. 3. A holder part for accommodating a fuel injection valve and having at its tip an insertion part to be inserted into an engine,
In a fuel piping device having a fuel pipe for supplying fuel to the holder part, the plurality of holder parts and a fuel injection valve housed in each of the plurality of holder parts are provided, and Among them, a fuel piping device, wherein a central axis of an adjacent fuel injection valve is inclined with respect to a central axis of a certain fuel injection valve. 4. A holder part for accommodating a fuel injection valve and having at its tip an insertion part to be inserted into an engine,
In a fuel pipe device having a fuel pipe for supplying fuel to the holder portion, a tip plane of a fuel injection valve housed in the holder portion and a tip plane of the holder portion are not parallel to each other. And fuel piping equipment. 5. A holder part for accommodating the fuel injection valve and having at its tip an insertion part to be inserted into the engine,
In the fuel piping device having a fuel pipe for supplying fuel to the holder portion, the holder portion has a protruding portion at a front end portion thereof that protrudes forward of the fuel injection valve housed in the holder portion, The portion is non-uniformly configured around the tip of the nozzle of the fuel injection valve. 6. A holder part for accommodating a fuel injection valve and having at its tip an insertion part to be inserted into an engine,
In a port injection system in which a fuel pipe device having a fuel pipe for supplying fuel to the holder portion is attached to an inserted portion of an engine, a central axis of the fuel injection valve is tilted with respect to a central axis of the inserted portion. The port injection system is characterized by being arranged as follows.