EP2205855A1 - Compact injection device - Google Patents
Compact injection deviceInfo
- Publication number
- EP2205855A1 EP2205855A1 EP08804690A EP08804690A EP2205855A1 EP 2205855 A1 EP2205855 A1 EP 2205855A1 EP 08804690 A EP08804690 A EP 08804690A EP 08804690 A EP08804690 A EP 08804690A EP 2205855 A1 EP2205855 A1 EP 2205855A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection device
- fuel
- piston
- pump
- suction jet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0041—Means for damping pressure pulsations
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
- F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
- F02M37/025—Feeding by means of a liquid fuel-driven jet pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
Definitions
- the present invention relates to an injection device with a fuel pump, a pressure regulator, an injector, an aerator and a suction jet pump in a compact design.
- Injectors are known in the prior art in various configurations. Especially for cost and space reasons require small internal combustion engines, which have only one or only two cylinders and a small displacement, independent solutions. Areas of use of such small internal combustion engines are, for example, two-wheelers, tricycles or lawnmowers, etc.
- Known injection devices usually comprise in a tank a high-pressure pump with a pressure regulator, wherein the high-pressure pump injects fuel at a predetermined pressure into a duct, e.g. a rail o.a., promotes.
- an injector is arranged, which injects controlled by a control device fuel into a suction pipe or directly into a combustion chamber.
- injectors are very expensive and especially expensive, so that they also make small internal combustion engines very expensive.
- a fuel injection device with electronic control in which an injector is arranged close to a pump piston. Further, in this case, a pre-pressure valve is provided for exerting an admission pressure on the fuel in an initial phase of a pressure stroke of the piston in the return line of the fuel to the tank.
- the admission valve evacuates a part of the fuel located in a pressure chamber in the return line. In this way, in particular the formation of vapor bubbles in the injector can be reduced.
- the structure is relatively complicated and the device takes up a large amount of space.
- suction jet pump for filling a pot, which is connected upstream of a fuel pump.
- the fuel by means of
- Suction jet pump from the tank into the pot.
- the suction jet pump is driven by a outgoing from the pressure side of the fuel pump return flow.
- the Liquid level in the pot raised to a liquid level in the tank, so that when sucking the fuel from the pot, there is a higher inlet pressure in the intake pipe. This reduces the risk of vapor bubble formation in the supply line to the fuel pump.
- this solution is also very expensive and expensive.
- the injection device according to the invention with the features of claim 1 has the advantage that it has a very compact structure. Furthermore, the injection device according to the invention can be produced in a particularly simple and cost-effective manner and the formation of vapor bubbles in the fuel supply line can be avoided. As a result, the injection device according to the invention can be used in particular in small internal combustion engines, e.g. at
- the injection device comprises a fuel pump, a pressure regulator for controlling an injection pressure, an injector, an aerator and a suction jet pump, consisting of a motive nozzle and a diffuser.
- the fuel pump, the pressure regulator, the injector and the air actuator are an integral part of an injection module.
- the injection module is very compact and physically small and can be completely pre-assembled.
- the suction jet pump only has to be connected to the corresponding connection of the injection module.
- the four integral components of the injection module are preferably arranged in a common housing of the injection module.
- the suction jet pump ensures that in the injection module, the formation of vapor bubbles is prevented, so that damage to the injection module and the metering of incorrect amounts of fuel can be avoided.
- the injection device according to the invention has a compact injection module and in addition an ejector pump, so that a trouble-free operation of the fuel-conveying components is ensured and the formation of vapor bubbles can be avoided.
- the suction jet pump is also an integral part of the injection module.
- the compact injection module comprises five components, namely the fuel pump, the pressure regulator, the injector, the aerator and the ejector.
- the suction jet pump can be particularly easily integrated be that the diffuser and the motive nozzle are arranged completely in the housing of the injector.
- the injection device comprises exactly one actuator, which simultaneously actuates the fuel pump and the aerator.
- a separate actuator for the aerator or the fuel pump can be dispensed with, so that the number of components is significantly reduced.
- this also results in a cost reduction.
- the only actuator of the injector assumes the function of the pump drive and, secondly, the function of the actuator for the air actuator.
- the only actuator of the injection device is preferably a magnetic actuator with exactly one coil and exactly one armature. This allows a particularly simple and inexpensive construction can be realized.
- the tank is disposed in the vehicle at a higher position than the suction jet pump.
- a higher pressure level in the suction jet pump can also be realized.
- the injection device comprises a return line which recirculates pressurized fuel from a pressure space to the ejector pump, more precisely to the motive nozzle.
- the pressure chamber may be a pumping chamber of the piston pump or a pre-pressure chamber.
- the fuel pump comprises an antechamber, which is arranged after the suction jet pump.
- the fuel is pressurizable to a predetermined value.
- a check valve is arranged between the admission pressure chamber and the suction jet pump.
- the check valve opens only when a predetermined opening pressure is reached by the suction jet pump. Furthermore, the check valve ensures that fuel can not flow from the admission pressure chamber back into the suction jet pump.
- the fuel pump comprises a piston, which is designed as a stepped piston with a first piston surface and a second piston surface.
- the first piston area is larger than the second
- the first piston surface is arranged in the pre-chamber and the second piston surface is arranged in the pumping chamber.
- a through hole is arranged in the piston of the fuel pump, which connects the front pressure chamber with the pumping chamber.
- a check valve is arranged, which prevents backflow of the fuel from the pumping chamber into the admission pressure chamber.
- the fuel pump comprises a first piston member, a second piston member and a diaphragm.
- the membrane is arranged in the direction of movement of the piston elements between the first and second piston element.
- the two piston elements are arranged on a common axis.
- the membrane forms a wall region of the admission pressure chamber. This allows a simple structure.
- the suction jet pump is preferably made of a plastic material.
- the suction jet pump can be produced for example by means of injection molding and also simultaneously with other components of the injection device, e.g. the housing by injection molding, are produced.
- a compressible pressure buffer device for example a bubble filled with gas, is arranged in the admission pressure chamber.
- a pressure buffer medium for example, a compressible medium disposed in the bubble, e.g. Air, serve.
- Figure 1 is a schematic view of a small motor with an injection device according to a first embodiment of the invention
- Figure 2 is a schematic sectional view of an injection module with a Saugstrahlpumpe according to the first embodiment
- Figure 3 is a schematic sectional view of an injection module with a suction jet pump according to a second embodiment of the invention.
- FIG. 1 shows schematically the structure of the small motor 1, which is designed as a single-cylinder engine.
- the small engine 1 comprises a cylinder 3, a reciprocating piston 4, a control unit 5 and a tank 6.
- the tank 6 is connected to an injection module 2 via a fuel supply line 6a.
- a suction jet pump 40 is arranged directly on the injection module 2.
- a return line 32 goes from the injection module 2 back to the suction jet pump 40.
- the tank 6 is arranged above the injection module 2.
- the injection module 2 is shown very schematically and comprises a fuel pump, a pressure regulator, an injector and an air actuator, so that the injection module 2 is constructed very compact.
- the small engine 1 further comprises a throttle valve 7, which is arranged in a suction pipe 8.
- a spark plug 9 On the cylinder 3, a spark plug 9, an intake valve 10 and an exhaust valve 11 is further arranged.
- the reference numeral 12 designates a bypass line for air, which branches off from the intake manifold 8 air from a region in the flow direction of the air in front of the throttle valve 7 and leads directly to the integrated into the injection module 2 aerator. An outlet of the bypass line 12 lies directly adjacent to the injector of the injection module. 2
- the small engine 1 further comprises an exhaust pipe 13, which is released or closed by the exhaust valve 11. Further, an oxygen sensor 14 is provided on the exhaust pipe 13 which is connected to the control unit 5 and the control unit 5 is further provided with a
- the control unit 5 controls the injection device 2 on the basis of the received signals.
- the injector according to the invention thus comprises, as shown in Figure 2, an injection module 2 with a fuel pump 20a, a pressure regulator 20b, an injector 20c and an aerator 2Od, which are arranged in a common housing 25, and can be designed to be particularly compact and physically small. Furthermore, the injection device according to the invention can be produced very inexpensively and in particular be pre-assembled in advance as a complete injection module 2, so that it only needs to be installed in the small engine 1 as a compact assembly. By integrating the four parts
- Fuel pump, pressure regulator, injector and air actuator is thus a simple and inexpensive manufacturability guaranteed.
- the fuel pump and the air actuator are actuated by a common actuator.
- a suction jet pump 40 is provided.
- the injection device 2 according to the invention can be used, for example, in small motors for two-wheelers or lawn mowers.
- the injection module comprises a coil 21 and an armature 22 cooperating with the coil 21.
- the armature 22 is fixedly connected to a first piston part 23 and a second piston part 24.
- the first piston part 23 is assigned to the air actuator 2Od and releases a cross section of the bypass line 12 at a seat 12a or closes the bypass line 12.
- the injection module 2 comprises a housing 25, which is manufactured from a plurality of individual parts 25a, 25b, 25c, 25d.
- the individual parts of the housing take on different functions.
- the seat 12a is formed on the item 25 of the housing.
- the injection module comprises a first admission pressure chamber 26, a second admission pressure chamber 27 and a pumping chamber 28.
- the first admission pressure chamber 26 and the pumping chamber 28 are in contact with the second piston part 24.
- the second piston part 24 forms a part of the fuel pump 20a.
- the second piston part 24 is designed as a stepped piston and has a first piston surface 24a and a second piston surface 24b.
- the first piston surface 24a is in contact with the fuel in the first admission pressure chamber 26 and the second piston surface is in contact with the fuel in the pumping chamber 28.
- the second piston part 24 is guided by guide areas, which are formed on the housing parts 25 c and 25 d.
- the first admission pressure chamber 26 is connected via a line 30 to the second admission pressure chamber 27, wherein a first check valve 29 is arranged in the line.
- the second admission pressure chamber 27 is connected to the pumping chamber 28 via a second check valve 31.
- fuel can then be injected into the suction pipe 8 from the pumping chamber 28 via a check valve of the injector 20c.
- the second pre-return chamber 27 is further connected via a line 32 to the suction jet pump 40.
- the pressure regulator 20b is arranged in the line 32.
- the pressure regulator 20b of this embodiment includes a throttle 35.
- a check valve may be provided instead of the throttle and a check valve.
- the suction jet pump 40 is arranged in the supply line 6a from the tank 6. As can be seen from FIG. 2, the suction jet pump 40 comprises only one motive nozzle 41 and one diffuser 42. As a result, the ejector pump 40 can be provided very simply and cost-effectively, for example as a plastic injection-molded part.
- the suction jet pump 40 is arranged in a curved line section 6a ', so that the fuel emerging from the motive nozzle 41 exits the tank 6 parallel to the flow direction of the fuel.
- the end of the diffuser 42 is connected to the first pre-pressure chamber 26, wherein between the first pre-pressure chamber 26 and the diffuser 42 is still a third check valve 43 is arranged.
- the suction jet pump 40 is arranged directly on the housing.
- the second piston part 24 is reset by means of a return spring 34, which is supported on a chamber wall 33 of the first admission pressure chamber 32 and presses against the first piston surface 24a.
- reference numeral 36 denotes an air-filled cavity. It should be noted that the cavity 36 need not necessarily be provided, but it is also possible that, for example, the return element for the second piston member 24 may be disposed in the cavity, so that the return element is not located in the fuel.
- the function of the injection device according to the invention according to the first embodiment is as follows.
- the coil 21 is energized, so that the armature 22 moves in the direction of the arrow A. Since the armature 22 is fixedly connected to the first piston part 23 and the second piston part 24, the two move
- Piston parts simultaneously with the armature 22 in the direction of arrow A. This opens the air actuator 2Od.
- an increase in pressure takes place in the first admission pressure chamber 26, since the first piston surface 24a is moved further into the first admission pressure chamber 26. Due to this increase in pressure, the first check valve 29 opens so that pressurized fuel flows into the second admission pressure chamber 27.
- the fuel located in the pumping chamber 28 is pressurized via the second piston surface 24b, with the injector 20c automatically opening from a predetermined pressure level and injecting fuel into the intake manifold 8.
- the second pre-pressure chamber 27 is connected via the line 32 to the suction jet pump 40, fuel is at a predetermined pressure to the suction jet pump 40 at.
- the suction jet pump 40 provides the drive of the suction jet pump via the drive nozzle 41.
- the propulsion jet from the motive nozzle 41 serves as the drive.
- an additional volume flow via the motive nozzle 41 still arrives at the volume flow of the fuel coming from the tank.
- the motive nozzle 41 is thereby submerged
- the drive nozzle 41, the diffuser 42 and the 90 ° curved line section 6a ' can be made of a plastic material in one step, for example by plastic injection molding.
- the suction jet pump 40 can be provided in a particularly cost-effective manner.
- the injection valve additionally has to circulate the volume flow necessary for driving the suction jet pump 40 via the line 32.
- the pressure energy transferred to this additional volume flow is then used to raise the pressure in the intake area above the tank pressure so that the formation of vapor bubbles in the intake area can be avoided with certainty.
- the tank 6 is additionally arranged slightly above the injection module 2, so that this also results in a certain pressure increase in the intake area.
- a particularly high pressure in the first admission pressure chamber 26 is achieved if a ratio of the injected volume flow to the intake volume flow (circulated volume flow plus injected volume flow) is relatively small. That is, the recirculated volume flow is much larger than the injected volume flow.
- a diameter in the driving nozzle 41 can be selected to be relatively small in order to achieve a high pressure in the first admission pressure chamber.
- Injection module 2 according to a second embodiment described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
- the injection module of the second embodiment is even more compact.
- the fuel pump 20 a of the second embodiment comprises a diaphragm 50 and a piston 51 exposed in a cylinder.
- a first check valve 29 is arranged in the through hole 52.
- the membrane 50 is firmly fixed to the housing 25 of the injection module and forms a chamber wall of the pre-chamber 26.
- the fuel pump 20a of the second embodiment comprises a plunger 53 which is fixedly connected to the armature 22.
- the plunger 23 and a piston part 23 of the Lucasstellers 2Od are firmly connected to the armature 22 and therefore move together.
- a return spring 54 is also provided.
- the function of the injection module 2 according to the second embodiment is as follows. If an injection of fuel to be made, the coil 21 is energized, so that the armature 22 moves together with the plunger 53 and the piston member 23 in the direction of arrow A. As a result, the plunger 53 comes into contact with the diaphragm 50, which is pressed into the admission pressure chamber 26. This results in an increase in pressure in the pre-pressure chamber 26, wherein an upper limit of the pressure is defined by the first check valve 29. When the diaphragm 50 has traveled a small distance in the direction of the arrow A, it comes into contact with a contact region 51a on the exposed piston 51, so that the membrane is moved together with the exposed piston 51.
- the piston 51 is moved against the spring force of the return spring 34, and the pressure in the pumping chamber 28 increases.
- the injector 20 c opens, so that fuel can be injected into the suction pipe 8, as indicated by the arrow B.
- a part of the volume flow is not injected into the suction tube, but guided via the line 23 to the suction jet pump 40.
- the suction jet pump 40 functions as in the first embodiment, so that by the pressure return and the suction jet pump formation steam bubbles in the intake of the fuel pump is avoided.
- the second embodiment thus has a reduced number of parts and can be provided very compact and small-sized. This makes it particularly suitable for small machines.
- a common actuator simultaneously actuates both the fuel pump 20a and the aerator 2Od.
- only one electrical connection for the actuator must be provided, which according to the invention always simultaneously actuates the air actuator 2Od and the fuel pump 20a.
- an additional air supply via the bypass line 12 is always achieved simultaneously with the fuel injection, so that a better mixing of the fuel in the supplied air is achieved in the mixture preparation in the intake manifold 8.
- the provision of the suction jet pump 40 surely allows the occurrence of vapor bubbles in the suction region of the fuel pump in operation.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007050547A DE102007050547A1 (en) | 2007-10-23 | 2007-10-23 | Compact injector |
PCT/EP2008/062786 WO2009053201A1 (en) | 2007-10-23 | 2008-09-24 | Compact injection device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2205855A1 true EP2205855A1 (en) | 2010-07-14 |
EP2205855B1 EP2205855B1 (en) | 2011-06-15 |
Family
ID=40262716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08804690A Not-in-force EP2205855B1 (en) | 2007-10-23 | 2008-09-24 | Compact injection device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2205855B1 (en) |
CN (1) | CN101835971A (en) |
AT (1) | ATE513124T1 (en) |
DE (1) | DE102007050547A1 (en) |
WO (1) | WO2009053201A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009003081A1 (en) * | 2009-05-13 | 2010-11-18 | Robert Bosch Gmbh | Compact injector with inward opening injector |
JP6421767B2 (en) * | 2016-02-12 | 2018-11-14 | 株式会社デンソー | Fuel pump control device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4431268B2 (en) | 2000-11-17 | 2010-03-10 | 株式会社ミクニ | Electronically controlled fuel injection device |
CN100439700C (en) * | 2004-12-08 | 2008-12-03 | 浙江飞亚电子有限公司 | Integrated type oil supplying unit |
US7458364B2 (en) * | 2005-08-05 | 2008-12-02 | Scion-Sprays Limited | Internal combustion engine having a fuel injection system |
-
2007
- 2007-10-23 DE DE102007050547A patent/DE102007050547A1/en not_active Withdrawn
-
2008
- 2008-09-24 CN CN200880112739A patent/CN101835971A/en active Pending
- 2008-09-24 AT AT08804690T patent/ATE513124T1/en active
- 2008-09-24 WO PCT/EP2008/062786 patent/WO2009053201A1/en active Application Filing
- 2008-09-24 EP EP08804690A patent/EP2205855B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2009053201A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2205855B1 (en) | 2011-06-15 |
DE102007050547A1 (en) | 2009-04-30 |
ATE513124T1 (en) | 2011-07-15 |
WO2009053201A1 (en) | 2009-04-30 |
CN101835971A (en) | 2010-09-15 |
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