WO2010012315A1 - Dispositif compact d'injection - Google Patents

Dispositif compact d'injection Download PDF

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Publication number
WO2010012315A1
WO2010012315A1 PCT/EP2008/060315 EP2008060315W WO2010012315A1 WO 2010012315 A1 WO2010012315 A1 WO 2010012315A1 EP 2008060315 W EP2008060315 W EP 2008060315W WO 2010012315 A1 WO2010012315 A1 WO 2010012315A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection device
fuel
injection
injector
actuator
Prior art date
Application number
PCT/EP2008/060315
Other languages
German (de)
English (en)
Inventor
Hans Schlembach
Joerg Heyse
Christian Bayer
Helmut Schneider
Udo Sieber
Rene Deponte
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN2008801027682A priority Critical patent/CN101779032B/zh
Publication of WO2010012315A1 publication Critical patent/WO2010012315A1/fr

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
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/006—Valves specially shaped for supplying secondary air
    • 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
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/12—Apparatus for adding secondary air to fuel-air mixture characterised by being combined with device for, or by secondary air effecting, re-atomising of condensed fuel
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • 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
    • F02M57/04—Fuel-injectors combined or associated with other devices the devices being combustion-air intake or exhaust valves
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/005—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by control of air admission to the engine according to the fuel injected
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an injection device with a fuel pump, a pressure regulator, an injector and an air actuator 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
  • injectors usually comprise in a tank a fuel pump with a pressure regulator, the fuel pump injecting fuel at a predetermined pressure into a duct, e.g. a rail o.a., promotes.
  • 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.
  • 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 are made particularly simple and inexpensive. As a result, the injection device according to the invention can be used in particular in small internal combustion engines, for example in two-wheeled vehicles or lawn mowers or the like.
  • the injection device comprises a fuel pump, a pressure regulator for controlling an injection pressure, an injector and an air actuator, which are integral components of an injection module.
  • the injection module is a compact, small-sized component, in which the fuel pump, the pressure regulator, the injector and the air actuator are arranged.
  • the injection module can be completely pre-assembled so that it only needs to be connected to the necessary connections and can be installed directly into a vehicle.
  • the four components of the injection module are preferably arranged in a common housing of the injection module. In addition to the compactness of the injection module is another great advantage that other components for the injection module can be minimized.
  • 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 armature is designed as a plunger, wherein the plunger has a first end portion and a second end portion.
  • the first end region is assigned to the fuel pump and the second end region is assigned to the air actuator.
  • the fuel pump preferably comprises a diaphragm for generating pressure.
  • the fuel pump includes a bellows.
  • the diaphragm is connected to the first end portion of the plunger.
  • the fuel pump comprises a pumping chamber, in which the fuel is sucked in, and a separate pressure chamber, into which the pressurized fuel is supplied.
  • a pumping chamber in which the fuel is sucked in
  • a separate pressure chamber into which the pressurized fuel is supplied.
  • an aperture and / or a check valve is arranged for connection. In this way, a pressure control of the pressure between the pumping chamber and the pressure chamber can take place.
  • the pumping chamber preferably has a volume which corresponds to a volume of a maximum injectable amount of fuel at a maximum injection pressure.
  • the actuator is angular synchronous according to a position of a piston or a crankshaft of the internal combustion engine operable. As a result, an improved accuracy of injection timing is achieved.
  • the injection device further comprises a control unit which controls the injector and the actuator, wherein the control unit is designed to hold the air actuator in its open position during an injection phase. This ensures that sufficient air is available for the combustion of the injected fuel via the aerator.
  • the control unit is also integrated in the injection module.
  • the injection device comprises a fuel pump, which has a common suction-pressure chamber with a fuel inlet port, a fuel return port and an injector port.
  • a valve in particular a check valve, is arranged in the fuel inlet connection, in the fuel return connection and in the injector connection. This allows the injector to have a particularly compact and inexpensive construction.
  • the actuator comprises a separate armature which is connected to a piston via a spring element arranged between the armature and the piston.
  • the spring element thereby biases the armature and the piston in opposite directions from each other.
  • the present invention relates to an internal combustion engine which comprises exactly one cylinder or exactly two cylinders and a fuel injection device according to the invention.
  • the internal combustion engine comprises a fuel tank, which is arranged above the injection module.
  • the fuel pump can be designed very small.
  • FIG. 1 shows a schematic view of a small motor with an injection device according to a first embodiment of the invention
  • FIG. 2 shows a schematic view of a small motor with an injection device according to a second exemplary embodiment of the invention
  • FIG. 3 shows a schematic view of an injection device similar to FIG. 2, in which an injection takes place
  • FIG. 4 shows a schematic sectional view of an injection device according to a third exemplary embodiment of the present invention in a state in which no injection takes place
  • FIG. 5 shows a schematic sectional view of an injection device according to a fourth exemplary embodiment of the invention
  • FIG. 6 shows a schematic sectional view of an injection device according to a fifth exemplary embodiment of the invention
  • Figures 7 to 9 are sectional views of an injection device according to a sixth
  • Figures 10 and 11 are schematic views of an injection device according to a seventh
  • 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 fuel return line 6b goes from the injection module 2 back to the tank 6.
  • the tank 6 is arranged above the injection module 2.
  • the injection module 2 is shown very schematically and includes a fuel pump, a pressure regulator, an injector and an air actuator, so that the injection module 2 is 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 are further arranged.
  • the reference numeral 12 denotes a bypass line for air, which branches off from the intake manifold 8 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 air actuator. 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 comprising a cooling water sensor 15, an oil temperature sensor 16 and a sensor unit 17 for detecting a throttle position, a temperature in the intake manifold 8 and a Pressure in the suction pipe 8 connected.
  • the control unit 5 controls the injection module 2 on the basis of the received signals.
  • the injection device according to the invention is thus provided as an injection module 2 with a fuel pump, a pressure regulator, an injector and an air plate, which are arranged in a common housing, 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 pre-assembled in advance as a complete injection module be so that it only needs to be installed in the small engine 1 as a compact assembly. The integration of the four items fuel pump, pressure regulator, injector and air actuator thus a simple and inexpensive manufacturability is guaranteed. The fuel pump and the air actuator are actuated by a common actuator. As a result, the injection device 2 according to the invention can be used, for example, in small motors for two-wheelers or lawn mowers.
  • FIGS. 2 and 3 show schematic views of an injection device designed as an injection module 2 in section.
  • FIG. 2 shows a state in which no injection of fuel into a suction pipe 8 takes place
  • FIG. 3 shows a state in which an injection into the suction pipe 8 is carried out.
  • the injection module 2 comprises a fuel pump 20a which comprises a piston 23, an armature 22 fixedly connected to the piston, a coil 21 and a membrane 26.
  • the diaphragm 26 is disposed at a first end 23 a of the piston 23.
  • the armature 22 is fixedly connected to the piston 23 at a second end 23 b of the piston 23.
  • a return spring 24 is arranged between a housing part 25 and the armature 22 and biases the armature 22 against a valve seat 12a in the bypass line 12.
  • the armature 22 is conically formed at its end directed to the bypass line 12 end 22a and thus forms an aerator 2Od.
  • the injection module 2 comprises a pump chamber 27 and a pressure chamber 28.
  • the diaphragm 26 forms a wall region of the pump chamber 27.
  • the pump chamber 27 and the pressure chamber 28 are separated from each other, wherein a first check valve 29 at the separation area between the pump chamber 27 and the pressure chamber 28 is arranged.
  • the first check valve 29 opens in the direction of the pump chamber 27 to the pressure chamber 28.
  • the pump chamber 27 is connected via a second check valve 30 to the fuel supply line 6a, wherein a suction of fuel through the second
  • the injection module 2 comprises a pressure regulator 20b, which regulates an injection pressure in the pressure chamber 28.
  • the pressure regulator 20b comprises a third check valve 31, which opens at too high a pressure in the pressure chamber 28 to the pressureless fuel supply line 6a and degrades a possibly too high pressure in the pressure chamber 28 in the fuel supply line 6a.
  • the pressure chamber 28 is connected to an injector 20c, which in this embodiment is an outwardly opening valve which opens above a predetermined pressure level and makes an injection into the intake manifold 8.
  • An orifice 12b of the bypass line 12 is arranged directly adjacent to the ejection opening of the injector 20c. According to the invention, the term "immediately adjacent" here means a distance of a few 10 1 mm to 1 cm from the ejection opening of the injector 20c.
  • Figure 2 shows the intake of the injection module 2, the piston 22 is pressed due to the restoring force of the return spring 24 via the armature 22 upwards in the direction of the bypass line 12.
  • the bypass line 12 is closed at the valve seat 12a by the end 22a of the armature 22.
  • a suction of fuel via the second check valve 30 from the fuel supply line 6 a as indicated by the arrow A.
  • the control unit 5 controls the common actuator for the fuel pump 20a and the air actuator 2Od consisting of the coil 28 and the armature 22, so that the coil 21 is energized and the armature 22 against the spring force the return spring 24 is pulled in the direction of arrow B, as shown in Figure 3.
  • the bypass line 12 is opened at the valve seat 12a, so that air can flow via the bypass line 12, which is indicated by the arrow C in FIG.
  • the diaphragm 26 presses against the sucked in the pump chamber 27 fuel.
  • the common actuator comprising the piston 23 and the armature 22 simultaneously actuates both the fuel pump 20a and the air actuator 20d formed by the end 22a of the armature 22 and the valve seat 12a in the bypass passage 12.
  • 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 during the mixture preparation in the intake manifold 8, a swirl amplification and thus a better mixing of the fuel in the supplied air is achieved.
  • the injector 20c may on the one hand be designed as an electromagnetically driven injection valve.
  • the check valve is designed as a pressure regulator 20b, which regulates the injection pressure to a desired value.
  • the injector 20c may also be designed as an outwardly opening valve which is biased by a spring and opens at a certain pressure.
  • the check valve has only a safety function as
  • the ⁇ ffhungstik this pressure relief valve must be higher than the ⁇ ffhungstik the injector 20c in any case.
  • a housing of the injection module 2 is preferably made of as few parts as possible, preferably in two parts, and more preferably made of a metallic material.
  • the injection module 2 which integrally includes the injector 20c, the fuel pump 20a, the pressure regulator 20b and the air plate 2Od, very compact.
  • the number of components can be kept low, so that the injection module 2 according to the invention can be provided very inexpensively.
  • the volume of the pumping chamber 27 is dimensioned in such a way that it stores the maximum amount that can be injected per stroke into the intake manifold 8 at a predetermined pressure. Furthermore, a control of the air actuator 2Od takes place synchronously. That is, at a certain angle at the beginning of the intake stroke of the internal combustion engine, the coil 21 is energized. This can be done during this
  • Phase of the energization of the coil 21 are actuated at a suitable injection timing of the injector 20c and carried out the injection.
  • the flow through the bypass channel 12 is particularly preferably dimensioned such that the air distributor 2Od is in any case still open after a fuel injection by means of the injector 20c. This and due to the sufficiently sized volume of the pump chamber 27 ensures that the required target fuel pressure in the pressure chamber is maintained despite the injection.
  • the aerator 2Od is closed as soon as a desired amount of air has passed the bypass channel 12.
  • the closing time of the air regulator 2Od is determined primarily by the end of injection. For closing the air regulator 2Od only the energization of the coil 21 is interrupted, so that the armature 22 is brought by the restoring force of the return spring 24 in the closed position. Since at the same time the diaphragm 26 is returned to the top, there is a new intake stroke of the pump chamber 27. In this case prevents the first check valve 29 between the pump chamber 27 and the pressure chamber 28 a
  • the injection module 2 of the third embodiment substantially corresponds to that of the second embodiment, in contrast to the pumping chamber and the pressure chamber are replaced by a common pump chamber 37.
  • a return element 38 is arranged, which presses against a membrane 26.
  • the membrane 26 is fixedly connected to the piston 23 as in the second embodiment.
  • the pump chamber 37 is bounded on the one hand by the membrane 26 and three check valves 34, 35, 36.
  • the check valve 34 is arranged in a fuel supply line 6a and the check valve 36 is in a
  • Fuel return line 6b arranged.
  • the check valve 35 locks or releases the path to the injector 20c in an injector port 6c.
  • Reference numeral 2Oe denotes a male terminal of the injector 20c.
  • the two check valves 35 and 36 are closed and the check valve 34 is opened, so that fuel from the conduit 6a can flow into the pump chamber 37.
  • the air actuator 2Od is closed as in the second embodiment.
  • the membrane 26 is pressed down by the energization of the coil 21 and the movement of the armature to build up pressure in the pressure chamber 37.
  • the aerator 2Od is opened.
  • valve 36 is designed as a pressure relief valve, which opens the way to the fuel return line 6b at too high a pressure.
  • Figure 4 the energized state of the coil 21 is shown, wherein the return spring 38 has brought the diaphragm 26 in its normal position, so that the intake stroke of the fuel pump is just finished.
  • FIG. 4 also shows a plug connection 21a of the coil 21. Otherwise, this embodiment corresponds to the second embodiment, so that reference can be made to the description given there.
  • the fourth embodiment substantially corresponds to the third embodiment, wherein in contrast to the third embodiment in the fourth embodiment additionally an intermediate piece 39 between the membrane 26 and a housing part 25 is arranged.
  • the additional intermediate piece 39 in particular improves a seal between the membrane 26 and the housing of the injection device.
  • a larger contact surface of the membrane 26 can be achieved on a housing component (see Figure 5 in the area above the check valves 34 and 36).
  • this embodiment corresponds to the third embodiment, so that reference can be made to the description given there.
  • FIG. 6 shows an injection device according to a fifth exemplary embodiment of the present invention, wherein again identical or functionally identical parts are designated by the same reference numerals as in the preceding exemplary embodiments.
  • the injection module 2 according to the fifth embodiment comprises a bellows 40 which is fixedly fixed to the piston 23 of the fuel pump.
  • the bellows 40 is hollow inside and open to a single pumping chamber 37 out.
  • the bellows 40 has an independent reset function due to its inherent elasticity.
  • FIG. 6 again shows the intake state of the fuel pump 20a. When the coil 21 is energized, the armature 22 moves together with the piston 23 fixed thereto, down, so that the bellows 40 is compressed.
  • the injection module 2 comprises an alternative connection between the armature 22 and a membrane 26. More specifically, a connection mechanism 50 with a bracket element 51 and a hook element 52 is provided for this purpose.
  • the stirrup element 51 is connected to the membrane 26 and, in this embodiment, is a cylindrical element with a passage opening at the bottom.
  • the hook member 52 is passed, which is formed of a connected to the armature 22 stem 52a and a handle-mounted plate 52b, wherein the plate 52b is disposed in the interior of the yoke member 51.
  • connection mechanism 50 allows the armature force of the armature 22 to be transmitted only in one direction, namely, in the upward direction.
  • a prestressed spring element 53 is provided between a housing component 25 and the membrane 26. This biased spring element 53 provides in a Bestromungsphase the coil 21 alone a force to change the position of the diaphragm 26 and thus to generate pressure in the single pump chamber 37 ready. The spring force of the spring element 53 thus determines the pressure increase in the pump chamber 37. In addition to the generation of pressure, the spring element 53 also takes over the function of a pressure setting at the same time.
  • FIG. 7 shows the intake state of the fuel pump.
  • the coil 21 is not energized and the armature 22 is pressed against the valve seat 12a in the bypass line 12 due to the restoring force of the return spring 24. Since the hook member 52 is fixedly connected to the armature 22, the plate 52 b of the hook member 52 pulls the bracket member 51 also upwards, whereby the diaphragm 26, which is fixedly connected to the bracket member 51 is pulled into the upper position shown in Figure 7 , As a result, fuel is sucked through the line 6a via the open check valve 34. This is indicated in Figure 7 by the arrow A. Furthermore, thereby the spring element 53 is biased.
  • the armature 22 opens the air actuator 2Od, as shown in Figure 8.
  • the armature 22 is moved against the restoring force of the return spring 24.
  • the hook element 52 is moved down, without thereby the bracket member 51 would be carried.
  • the force of the armature 22 is lifted onto the bracket member 51.
  • the spring element 53 can relax, so that, as shown in FIG. 9, the spring element 53 moves the diaphragm 26 into the pump chamber 37, as a result of which the pressure in the pump chamber 37 is increased (see FIG 9).
  • the injector 20 is at a sufficient pressure, so that an injection can be started, at the same time already the air channel 12 is open.
  • FIGS. 10 and 11 show an injection apparatus according to a seventh embodiment of the present invention, wherein again the same or functionally identical parts are designated by the same reference numerals as in the preceding embodiments.
  • the injection device 2 comprises an armature 22 and a piston 60 which is separate therefrom.
  • the piston 60 is fastened at one end to a diaphragm 66 and has a plate 62 at its other end.
  • the plate 62 serves as a support for a spring element 61, which is arranged between the piston 60 and the armature 22.
  • the plate 62 also serves as a support for a return element 24, which is supported at its other end to a housing member 25.
  • FIG. 10 shows the intake phase of the fuel pump 20 a of the injection device 2.
  • the check valve 30 is opened and draws fuel from the line 6 a into the pump chamber 27.
  • the fuel pump in turn comprises a pump chamber 27 and a pressure chamber 28, as shown in the second embodiment.
  • the coil 21 is not energized, so that the armature 22 is pressed by the force of the spring element 61 against the valve seat 12a in the bypass line 12.
  • the armature 22 moves, as indicated in Figure 11 by the arrow F, down against the spring force of the spring member 61. Since the spring force of the spring member 61 is smaller than the spring force of the return spring 24, which remains Piston 60 in its position, whereby the diaphragm 26 is not moved.
  • the piston 60 moves together with the armature 22.
  • the pressure build-up in the pump chamber 27 begins in the manner described in the second embodiment, until the check valve 29 opens and the fuel flows into the pressure chamber 28.
  • the design of the injection module 2 of the seventh embodiment has the advantage that a delayed movement of the piston 60 is achieved. This ensures that the bypass line 12 is opened via the aerator 2Od, before an injection of fuel can take place via the injector 20c. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.
  • the injection device is constructed very compact and inexpensive and the injection module 2 each comprise as integral components a fuel pump 20a, a pressure regulator 20b, an injector 20c and an aerator 2Od.
  • the injection module 2 each comprise as integral components a fuel pump 20a, a pressure regulator 20b, an injector 20c and an aerator 2Od.
  • a common actuator for the aerator 2Od and the fuel pump 20a is provided.
  • a magnetic actuator by energizing a coil has been described as an actuator.
  • other possible actuators may be used, e.g. a piezoactuator. It should also be noted that this is described in the exemplary embodiments
  • Closing element of the air actuator 2Od which is designed as a conical end portion 22a of the armature 22, also in any other way, for example, as a ball or part ball, or may be formed in other ways as a tapered surface.

Abstract

La présente invention concerne un dispositif d'injection qui comprend une pompe à carburant (20a), un régulateur de pression (20b), un injecteur (20c) et un dispositif (20d) de réglage d'air, caractérisé en ce que la pompe à carburant (20a), le régulateur de pression (20b), l'injecteur (20c) et le dispositif (20d) de réglage d'air font partie intégrante d'un module d'injection (2).
PCT/EP2008/060315 2007-08-10 2008-08-06 Dispositif compact d'injection WO2010012315A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008801027682A CN101779032B (zh) 2007-08-10 2008-08-06 紧凑的喷射装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102007037870 2007-08-10
DE102007037870.1 2007-08-10
DE102008040881.6 2008-07-31
DE102008040881A DE102008040881A1 (de) 2007-08-10 2008-07-31 Kompakte Einspritzvorrichtung

Publications (1)

Publication Number Publication Date
WO2010012315A1 true WO2010012315A1 (fr) 2010-02-04

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Application Number Title Priority Date Filing Date
PCT/EP2008/060315 WO2010012315A1 (fr) 2007-08-10 2008-08-06 Dispositif compact d'injection

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Country Link
CN (1) CN101779032B (fr)
DE (1) DE102008040881A1 (fr)
WO (1) WO2010012315A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008007203A1 (de) * 2008-02-01 2009-08-06 Robert Bosch Gmbh Kompakte Einspritzvorrichtung mit druckgesteuerter Düse
DE102009045140B4 (de) 2009-09-30 2022-03-31 Robert Bosch Gmbh Kompakte Einspritzvorrichtung mit reduzierter Bauteileanzahl

Citations (5)

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EP1340906B1 (fr) * 2000-11-17 2006-01-18 Mikuni Corporation Dispositif d'injection de carburant a commande electronique
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