CN107110102B - Fuel injection unit for internal combustion engine - Google Patents
Fuel injection unit for internal combustion engine Download PDFInfo
- Publication number
- CN107110102B CN107110102B CN201580072714.6A CN201580072714A CN107110102B CN 107110102 B CN107110102 B CN 107110102B CN 201580072714 A CN201580072714 A CN 201580072714A CN 107110102 B CN107110102 B CN 107110102B
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- Prior art keywords
- needle
- fuel
- fuel injection
- injection unit
- flow
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
- F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
- F02M63/022—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by acting on fuel control mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/44—Valves, e.g. injectors, with valve bodies arranged side-by-side
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Present invention discusses a kind of novel fuel injection units for the large combustion engine with common rail fuel system.Fuel injection unit (10) of the invention is connected to the common rail fuel system, the fuel injection unit (10) includes first jet (22) and second nozzle (24), the first jet (22) has the first needle control space (34) connecting by flow channel (48) with the first control valve (16), the first jet (22) and the second nozzle (24) have common needle cavity (30), first needle control space (34) is connected to first control valve (16) by the flow fuse (50) wherein relatively arranged with the flow channel (48).
Description
Technical field
The present invention relates to a kind of for spraying with multiple cylinders and using the fuel of the internal combustion engine of common rail fuel system
Penetrate unit.The invention further relates to a kind of with multiple cylinders with cylinder head and utilizes the internal combustion engine of common rail fuel system,
Each cylinder head is provided with fuel injection unit.
Background technique
In modern internal combustion engines, fuel is directly injected to the cylinder of engine by fuel injection valve or injector
In.Because injection occurs to need sufficiently high pressure in the stage relatively late of compression stroke end to be used to carry out
Injection.In conventional fuel feeder system, each cylinder is provided with the jet pump of oneself, by fuel via eductor pump
It is sent in the combustion chamber of cylinder.However, using and controlling for conventional system has significant limitation.System can not be adjusted easily
Setting.In addition, the pressure of jet pump is alterable, so that the injection into difference cylinder can be sent out at various pressures respectively
It is raw, and thus different amounts of fuel can be provided.In addition, because the injection nozzle of the prior art is mainly hydraulic, that is,
Opened under some intended fuel pressure and below pressure reduction to predetermined value when be closed, thus injection opportunity and it is lasting when
Between control also should be able to be in view of using (i.e. when the engine is running) abrasion of system unit during system.
The scheme of update is so-called " common rail injection " or " pressure injection altogether ", wherein providing pressure and injection fuel in function
Can on be separated from each other.Fuel is fed in common pressure feeding mechanism (that is, track) by least one high pressure fuel pump, combustion
Material is directed into the injector of each cylinder from common pressure feeding mechanism via isolated pipe.In practice, injector
Operation be electronically controlled (such as by solenoid or piezoelectricity control valve), to obtain true injection short and pithy enough.
The most apparent problem domain of many of traditional fuel feeder system is (to be up to about 2200 by using common high pressure
Bar) fuel supply device and electronically controlled fuel injector solve, by electronically controlled fuel injector, such as same
It can repeatedly be injected fuel into cylinder during one compression stroke.In other words, hence it is evident that than the fuel of the prior art
Jet pump preferably controls the fuel quantity on the opportunity of injection, the duration of injection and injection, has also greatly reduced whereby interior
Emission level under the normal operating condition of burn engine.
Nowadays, the operation of fuel injector is controlled by the electronic control valve for being arranged to be connected to Flow in Nozzle.Control
Valve and nozzle work, so that complete fuel rail pressure is provided in the cavity (i.e. needle cavity) around needle, pressure tendency
In the needle for opening nozzle.However, needle is provided with spring, spring pushes needle, is allowed to be resisted against it and is located at the upper of jet nozzle openings
On the base-plates surface of trip.In addition, the end opposite with nozzle opening about needle, so-called needle control space is arranged such that
The pressure in needle control space pushes up needle in side identical with spring.Needle control space and needle cavity be arranged to each other via
The opening or flow communication of one or more excellent dimensions, the opening or flow channel limit between two cavitys
Flowing, that is, limitation speed, needle control space in pressure can increase.The practical control of needle is by electronically opening control
Valve and occur, whereby needle control space in pressurized fuel low-pressure fuel discharge member can be escaped into via control valve so that entirely
Portion's fuel pressure influences injector needle and injector needle is lifted away from its base-plates surface, to open injection nozzle, and starts
Injection.After the desired period, it is assumed that Yao Jinhang fuel injection, control valve closure, and the pressure in needle control space
It increases, whereby the closed-nozzle together with spring of the pressure in needle control space, that is, push needle to be allowed to against pedestal.
So far, it is discharged in view of them in full load, diesel engine is optimised.However, following emission regulation
It is required that emission level is necessarily minimized under all operating conditions.In other words, it is necessary to execute the loaded frequency spectrum of institute and adjust.
For example, the use of even modern common rail fuel system and the electronic control of fuel injector relate to the case where will not bringing expected result
And the operation of engine under a low load, or more generally, substantially away from its design (calculated) load.Final goal is to improve fuel
Injection, so that engine discharge of (that is, from low-load to fully loaded) under the conditions of its whole operation may remain in minimum level.
This effort caused using injection valve or tool there are two injection nozzle injector.For example, US-B2-7,556,
017 discusses the fuel injector with injector body, which, which limits, is configured to receive the hollow of pressurized fuel
It first jet that is internal, being configured to provide the first fuel spray pattern and is configured to provide and sprays pattern different from the first fuel
The second fuel spray pattern second nozzle.First jet and second nozzle can be configured to the fuel that will be supplied from common source
It is ejected into combustion space.Nozzle can be used in the separated stage during the compression stroke of piston, so that first jet is being pressed
The fuel of predetermined amount is sprayed in the early stage of contracting stroke, and second nozzle is sprayed in later phases or in the end of compression stroke
It penetrates.First jet is commonly known as pilot burner, and second nozzle is main burner.
The device known in the art that be arranged to be connected to fuel injector for being referred to as flow fuse or flow-limiting valve,
Fuel is stuck in for handling injector needle can flow out the situation of such position in the cylinder.Flow fuse passes through inspection
Fuel pressure is surveyed to change and work and influence flowing in the case where abnormal pressure drop condition.For example, if injector needle exists
Leak pressure after flow fuse is fallen, then flow fuse stops to injector feed fuel whereby.Floating insurance
The requirement that device is designed and is sized to allow the amount of injection to correspond to cylinder full load fuel quantity before closing injector
Setting, there is naturally some surpluses.
However, using there are two the relevant floating insurances of the injector of nozzle (that is, pilot burner and main burner) to fill to tool
It sets, it is intractable for sharing identical fuel space.If single flow fuse, which is disposed in, introduces spray for pressurized fuel
In the burning line of emitter, then it is necessary for main burner naturally or needle is sized.In other words, if main needle fails, that is, quilt
Opening is blocked, then flow fuse closes introducing of the oil into the fuel space shared by two nozzles.However, because of main needle
The amount of injection (flow fuse is sized thus) it is normal more several ten times larger than the needle that ignites, so the needle that ignites is for any original
The failure of cause will not influence the operation of flow fuse.In other words, because the amount of injection for the needle that ignites is so small, flowing
Safety device cannot detect small variation, and the leakage for the needle that ignites causes fuel pressure.As a result, fuel can flow in fuel space
And cylinder is ejected into without interrupting from nozzle opening.
The needle that ignites may be leaked for two independent reasons.The opening firstly, needle of pilot burner may be stuck, or
Person is secondly, control valve may fail.Consider that latter problem, the prior art not yet discuss that control valve can also be now
The component that may be failed.In other words, for some reason, the pin of control valve may not return to it over time, become
Pedestal on, it is assumed that fuel is sprayed via needle is ignited, but control valve stays open and fuel is allowed to discharge via control valve
Into low-pressure fuel pipeline.In practice, such fuel draining means for normal if control valve is closed in needle control
The pressure of raising is not improved in space processed, the needle that ignites whereby stays open and fuel continues to be ejected into cylinder.
Summary of the invention
It is an object of the invention to solve the above problems.
It is another object of the present invention to increase the safety in common rail fuel injection system.
Another object of the present invention is that excess of fuel is prevented to be ejected into cylinder.
A further object of the present invention is to reduce the discharge created by internal combustion engine.
At least one purpose of the invention is suitable for being assembled into cylinder head and for injecting fuel into internal combustion by a kind of
The fuel injection unit of the cylinder of engine realizes that the internal combustion engine has common rail at least one high pressure fuel pump
Fuel system, the fuel injection unit are connected to the common rail fuel system, and the fuel injection unit includes first jet
And second nozzle, the first jet have the first needle and control by the first needle that flow channel is connect with the first control valve empty
Between, the first jet and the second nozzle have common needle cavity, wherein relatively arrange with the flow channel
First needle control space is connected to first control valve by flow fuse.
At least one purpose of the invention by it is a kind of with multiple cylinders with cylinder head and utilize common rail fuel system
The large combustion engine of system is realized, wherein each cylinder head is provided with fuel injection unit.
When solving at least one above problem, the present invention also brings many advantages in the case where control pin fails,
In several advantages be listed in it is following:
The too high risk of the cylinder pressure that elimination causes because excess of fuel sprays；
Reduce discharge；
Reduce the amount of circulation of fluid；And
Energy needed for reducing pressurized fuel.
Detailed description of the invention
Below, fuel injection unit of the invention is described in more detail with reference to, in which:
Fig. 1 schematically shows the cross-sectional view of fuel injection unit according to the preferred embodiment of the present invention；And
Fig. 2 schematically shows the details of the fuel feeding means of Fig. 1 with the ratio amplified.
Specific embodiment
Fig. 1 schematically shows the cross-sectional view of fuel injection unit of the invention.Fuel injection unit 10 includes it is expected
Pressure received from common track (not shown) the fuel deposition device 12 of fuel, main flow safety device 14, the first control valve 16,
Second control valve 18 and fuel injector 20.Fuel injector 20 include with the first needle 24 first or pilot burner 22 and
Second or main burner 26 with the second needle 28.First jet 22 and second nozzle 26 have common needle cavity 30.Two nozzles
With base-plates surface and nozzle opening (positioned at the end in face of cylinder of injection unit 10).Needle faces engine
The end (i.e. its first end) of cylinder is against base-plates surface, thus closure being in fluid communication from needle cavity 30 to nozzle opening 32.
There are the first needles to control space 34 at the other end (i.e. the end far from cylinder or second end) of the first needle 24, and
There are the second needles to control space 36 at the upper end (i.e. the end far from cylinder or second end) of the second needle 28.Needle control
Space 34 and 36 is arranged to respectively to be in fluid communication via the first restricted flow passage 38 and 40 and common needle cavity 30.First
Needle 26 and the second needle 28 are maintained at it by spring 42 and 44 and the fuel pressure acted in needle control space 34 and 36
In closed position, i.e. being pressed against on its base-plates surface at the first end of cylinder in needle.It describes so far
It is prior art fuel injection unit.
In order to describe how prior art fuel injection unit works, by taking first jet 22 as an example.Starting point is adequately to fire
Material rail pressure is present in accumulator 12 and needle cavity 30, acts on all surface of the first needle 26, including works as and be subjected to firing
Expect to tend to the surface that the first needle 28 is lifted away to its base-plates surface when pressure.However, in the first control valve 16 closure, it is identical
Rail pressure also has an impact in the first needle control space 34, whereby the fuel pressure and compressed spring in needle control space 34
42 power is able to maintain the first needle 26 against its base-plates surface, and first jet 22 is closed whereby.Now, the electronic control of engine
Unit indicates that the first control valve 16 is opened, and controls 48 shape of flow channel between space 34 and the first control valve 16 via the first needle
Direct flow path of the space 34 to low-pressure fuel outlet drain part 46 for pressurized fuel is controlled at from the first needle.Meanwhile the
One needle controls the pressure decline in space 34, and because spring 42 cannot individually keep the first needle 26 against its base-plates surface,
So the first needle 26 is lifted away from its base-plates surface by whole fuel pressures, and high pressure fuel jet stream is arrived via the spray of first jet 22
In cylinder.Next, the electronic control unit of engine indicates the first control valve 16 closure, space is controlled to also be closed from needle
34 arrive the direct flow path of low-pressure fuel outlet drain part 46.Meanwhile the pressure in needle control space 34 starts to improve, whereby
Pressure can push the first needle 26 against its base-plates surface to stop spray movement together with spring 42.The function of second nozzle 24
It is identical.
It however, above-mentioned sprayer unit (especially its first jet 22) has weakness, and is the first control valve 16.Such as
Fruit control valve 16 fails, i.e., can not be closed from the first needle and control space 34 to low-pressure fuel outlet drain part 46 for pressurized fuel
Direct flow path, the pressure in the first needle control space 34 do not improve, and the first needle 26 is maintained at it and is lifted away under state, makes
Fuel is obtained continuously to spray in the cylinder of engine.Meanwhile from needle control space 34 via flow channel 48 and the first control valve
16 have continuous flowing to low-pressure fuel outlet drain part 46.Obvious in sprayer unit in order to solve the problems, such as, the present invention is built
View improves injection unit.
Present invention introduces the improvement to above-mentioned prior art injector unit to see in Fig. 1, wherein sprayer unit
10 are provided with flow fuse 50, and flow fuse 50 is arranged in the control of the first needle at the second end of the first needle 26 space
34 and the first flow channel 48 between control valve 16 in.
Flow fuse 50 discussed in detail is by 52 shape of cylindrical cavity with inner wall 54 and bottom surface 56 in Fig. 2
At flow channel 48 has opening 48 ' wherein.It is controlled by the bottom 60 in face of the first needle control space 34 and far from the first needle
The cup piston 58 that space 34 and the skirt section 62 extended from bottom 60 are formed is arranged in cylindrical cavity 52, so that spring 64 is arranged
In the inside of piston skirt 62, between the bottom of piston 58 60 and the bottom surface 56 of cylindrical cavity 52.The bottom of piston 58
60 and skirt section 62 leave at least one restricted flow passage 66 positioned at itself between the inner wall 54 of cylindrical cavity 52.Flowing is protected
Dangerous device 50 works, so that in normal operation condition, i.e., when the first control valve 16 is opened in a manner of it should work, permitting
Perhaps oil flows to the first control valve 16 from the first needle control space 34, and the piston 58 of flow fuse 50 controls empty far from the first needle
Between 34, i.e. pressure compressed spring 64 in the first needle control space 34 simultaneously keeps piston 58 mobile.The prerequisite of this operation exists
In the flow resistance of the first control valve 16 is lower than the flow resistance of at least one restricted flow passage 66, whereby via control valve
16 volume flow is higher than the volume flow via at least one restricted flow passage 66.To as a result be, the control of the first needle
Pressure in space 34 is released, so that the first needle 26 is lifted away from its base-plates surface, and fuel injection can occur.In the first control
After valve 16 is closed, needle controls space 34 via at least one 38 Fast Filling pressurized fuel of the first restricted flow passage, whereby
First needle 26 is pushed back and against its base-plates surface.Now, when the first control valve 16 is closed, spring 64 is by piston 58 towards needle
It controls space 34 to push, because some fuel in needle control space 34 can make piston 58 along at least one the second restricted flow
Dynamic channel 66 passes through, so that the fuel pressure of 58 two sides of piston is balanced.Piston 58, its skirt section 62 and cylindrical cavity 52 and extremely
Few second restricted flow passage 66 is dimensioned, so that when piston 58 moves on the direction far from needle control space 34
When, the space of release be enough for the pressure in space to be reduced to keep the first pressure needed for its base-plates surface of needle 28 it
Under.In other words, the flow resistance of the first restricted flow passage 38 is higher than the flow resistance of the second restricted flow passage 66.
Under abnormal operating conditions, i.e., when the first control valve 16 is being equal to the certain space for flowing to low-pressure fuel discharge member 46
When being not yet closed but stay open after a predetermined period of time of oil, the piston 58 of flow fuse 50 controls space far from needle
34, until the bottom surface 56 of the skirt section of piston 58 62 and cylindrical cavity 52 meet and prevent to control from the first needle space 34 via
The flowing of flow channel 48 to low-pressure fuel outlet drain part 46 connects.In other words, in flow channel 48 to the inside of skirt section 62
The bottom surface 56 of cylindrical cavity 52 when opening, only prevent to control space with needle via at least one the second restricted flow passage 66
34 connection.Hereafter, the pressure in the first needle control space 34 can be improved, usually as when the first control valve 16 is closed,
So that the first needle 26 will be pushed back and against its base-plates surface.However, fuel pressure in present first needle control space 34 without
Method enters the inside of piston 58, returns to piston 58 towards needle control space 34 without pressure auxiliary on the inside of piston 58, and whereby the
One needle 28 is remained closed until the first control valve 16 is closed.
It should be understood that the above content is only the novelty of internal combustion engine and showing for creative fuel injection unit
Example property description.It should be understood that position is not although above instructions discusses some position of flow fuse
It is the position for limiting the invention to discuss.Be equally applicable to the type of flow fuse, i.e., for example, flow fuse it is detailed
Thin building is only limitted to function as discussed above.Flow fuse can be ball-type, piston type or any other type as a result,
Float trap.Similarly, flow fuse can be positioned on the control space of the first needle at the second end along the first needle and first
Any position of the length of flow channel between control valve.Flow fuse can be not only disposed to and the first needle control as a result,
Space processed is directly connected to, and is arranged into the upstream until control valve.Above description is not construed as in any manner
The limitation present invention, but entire scope of the invention is only limited by the claims that follow.As described above, it should be appreciated that
It is that independent feature of the invention is used in combination with other independent features, even if such combination does not have in description or attached drawing
Body discloses or shows also so.
Claims (12)
1. a kind of fuel injection unit, which is suitable for being assembled into cylinder head and for injecting fuel into internal combustion
The cylinder of engine, the internal combustion engine have the common rail fuel system at least one high pressure fuel pump, the fuel spray
It penetrates unit (10) and is connected to the common rail fuel system, the fuel injection unit (10) includes first jet (22) and the second spray
Mouth (24), the first jet (22) have the first needle (26) and connect with the first control valve (16) by flow channel (48)
First needle controls space (34), and the first jet (22) and the second nozzle (24) have common needle cavity (30),
It is characterized in that, first needle is controlled space by the flow fuse (50) relatively arranged with the flow channel (48)
(34) it is connected to first control valve (16).
2. fuel injection unit according to claim 1, which is characterized in that the flow fuse (50) includes flowing
Closing device is connected, which connects closing device for being closed from first needle control space (34) to first control
The flowing of valve (16) connects.
3. fuel injection unit according to claim 1 or 2, which is characterized in that the flow fuse (50) is ball
Type or piston type float trap.
4. fuel injection unit according to claim 2, which is characterized in that the flowing connection closing device is arranged on
The piston (58) in cylindrical cavity (52) between first needle control space (34) and first control valve (16).
5. fuel injection unit according to claim 4, which is characterized in that the piston (58) has bottom (60) and skirt
Portion (62), the bottom (60) is in face of first needle control space (34), and the skirt section (62) from the bottom (60)
Extend along the direction far from first needle control space (34).
6. fuel injection unit according to claim 5, which is characterized in that the cylindrical cavity (52) has bottom surface
(56) and spring (64), the spring (64) are relatively arranged in the bottom of the piston (58) with the piston (58)
(60) between the bottom surface (56) of the cylindrical cavity (52).
7. fuel injection unit according to claim 6, which is characterized in that the flow channel (48) is located at the column
Opening (48 ') in the bottom surface (56) of shape cavity (52) is sized and positioned to the institute so that the piston (58)
Skirt section (62) is stated to surround the opening (48 ') when being compressed against on the bottom surface (56) and prevent from the piston (58)
The flowing of surrounding to the flow channel (48) connects.
8. fuel injection unit according to claim 4, which is characterized in that the common needle cavity (30) with it is described
At least one first restricted flow passage (38) with the first flow resistance is provided between first needle control space (34).
9. fuel injection unit according to claim 8, which is characterized in that in the piston (58) and the cylindrical cavity
(52) at least one second restricted flow passage (66) with the second flow resistance is provided between side wall (54).
10. fuel injection unit according to claim 9, which is characterized in that first flow resistance is higher than described the
Two flow resistances.
11. fuel injection unit according to claim 9, which is characterized in that first control valve (16) has flowing
Resistance, and the flow resistance of first control valve (16) is lower than second flow resistance.
12. a kind of internal combustion engine with multiple cylinders with cylinder head and utilization common rail fuel system, which is characterized in that
Each cylinder head is provided with according to claim 1 to fuel injection unit described in any one of 11 (10).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2015/050145 WO2016142570A1 (en) | 2015-03-06 | 2015-03-06 | A fuel injection unit for an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107110102A CN107110102A (en) | 2017-08-29 |
| CN107110102B true CN107110102B (en) | 2019-08-06 |
Family
ID=52684246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580072714.6A Active CN107110102B (en) | 2015-03-06 | 2015-03-06 | Fuel injection unit for internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3265668B1 (en) |
| KR (1) | KR101999908B1 (en) |
| CN (1) | CN107110102B (en) |
| WO (1) | WO2016142570A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7556017B2 (en) | 2006-03-31 | 2009-07-07 | Caterpillar Inc. | Twin needle valve dual mode injector |
| FI123513B (en) * | 2010-12-02 | 2013-06-14 | Waertsilae Finland Oy | Fuel supply unit, method for operating it and combustion engine |
| FI20115126L (en) * | 2011-02-09 | 2012-08-10 | Waertsilae Finland Oy | Fuel injection system |
| FI123474B (en) * | 2012-01-19 | 2013-05-31 | Waertsilae Finland Oy | Fuel injection systems |
| EP2669503A1 (en) * | 2012-05-29 | 2013-12-04 | Delphi Technologies Holding S.à.r.l. | Fuel Injector |
| US20140069387A1 (en) * | 2012-09-07 | 2014-03-13 | Caterpillar Inc. | Dual fuel injector and common rail fuel system using same |
-
2015
- 2015-03-06 KR KR1020177021910A patent/KR101999908B1/en active IP Right Grant
- 2015-03-06 WO PCT/FI2015/050145 patent/WO2016142570A1/en active Application Filing
- 2015-03-06 CN CN201580072714.6A patent/CN107110102B/en active Active
- 2015-03-06 EP EP15710221.1A patent/EP3265668B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107110102A (en) | 2017-08-29 |
| KR20170102534A (en) | 2017-09-11 |
| EP3265668B1 (en) | 2018-12-19 |
| EP3265668A1 (en) | 2018-01-10 |
| WO2016142570A1 (en) | 2016-09-15 |
| KR101999908B1 (en) | 2019-07-12 |
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