EP1546544A1 - Systeme d'injection de carburant pour moteur a combustion interne - Google Patents

Systeme d'injection de carburant pour moteur a combustion interne

Info

Publication number
EP1546544A1
EP1546544A1 EP03724838A EP03724838A EP1546544A1 EP 1546544 A1 EP1546544 A1 EP 1546544A1 EP 03724838 A EP03724838 A EP 03724838A EP 03724838 A EP03724838 A EP 03724838A EP 1546544 A1 EP1546544 A1 EP 1546544A1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure pump
opening
fuel
connection
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.)
Withdrawn
Application number
EP03724838A
Other languages
German (de)
English (en)
Inventor
Andreas Holl
Achim Koehler
Sascha Ambrock
Martin Klander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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
Publication of EP1546544A1 publication Critical patent/EP1546544A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/028—Returnless common rail system
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way 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
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief 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
    • 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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is known from DE 198 53 103 AI.
  • This fuel injection device has a delivery pump, through which fuel is delivered to at least one high-pressure pump, the high-pressure pump delivering fuel under high pressure to a reservoir. Furthermore, a fuel metering device is provided, which is arranged between the feed pump and the high-pressure pump.
  • Fuel metering device is used to control the amount of fuel delivered by the high-pressure pump into the memory depending on the operating parameters of the internal combustion engine.
  • the fuel metering device comprises an actuator in the form of an electromagnet and a control valve actuated by it, which has a slide-shaped valve member which is guided in a cylinder bore of a valve housing and can be displaced by an armature of the electromagnet against a return spring. In cooperation with a drain opening, the valve member controls the valve housing via its
  • the outer jacket has a flow cross-section from the feed pump to the high-pressure pump.
  • this is with its outer jacket in Cover with the drain opening so that the flow cross-section is completely closed.
  • the valve member since the valve member must be displaceable in the cylinder bore of the valve housing, there is a small gap between the outer casing and the cylinder bore through which a leakage amount of fuel can pass and reach the high-pressure pump via the drain opening, even if due to the operating parameters of the internal combustion engine, for example in the Thrust operation, through which the high-pressure pump is not allowed to deliver fuel, with a so-called zero delivery.
  • a throttled connection to a relief area can be provided, but then fuel constantly flows into the relief area after the fuel metering device and there is also an increased pressure level between the fuel metering device and the high-pressure pump.
  • the opening pressure of at least one suction valve of the high-pressure pump must be set correspondingly high, but this has an adverse effect on the delivery rate of the high-pressure pump.
  • a complex structure and a complex production of the fuel injection device are therefore required.
  • the fuel injection device with the features according to claim 1 has the advantage that the valve member, when this closes the flow cross-section between the feed pump and the high-pressure pump for zero delivery, opens a connection to a relief region into which the fuel delivered by the delivery pump or as a result a leak in the fuel metering device High pressure pump fuel can drain. Fuel therefore only flows into the relief area at zero delivery if no fuel is to be delivered by the high-pressure pump. Thus, especially when starting the internal combustion engine, when a large amount of fuel has to be delivered by the high-pressure pump, a loss of fuel is narrowly avoided.
  • Delivery pump and the fuel metering the delivery pressure of the delivery pump is maintained, which causes discontinuities in the pressure curve before
  • Fuel metering device are avoided and thereby an improved setting of the pressure in the memory is made possible by means of the fuel metering device.
  • the structure and manufacture of the fuel injection device are correspondingly simplified by the features of claim 1, since no additional measures for zero delivery are required.
  • Fuel injection device for an internal combustion engine in a schematic representation, Figure 2 in an enlarged view a fuel metering device
  • Fuel injection device according to a first embodiment with a valve member in a first position
  • Figure 3 shows the fuel metering device with the valve member in a second position
  • Figure 4 shows the fuel metering device according to a second embodiment
  • Figure 5 shows the fuel metering device according to a third embodiment.
  • FIG. 1 shows a fuel injection device for an internal combustion engine, for example of a motor vehicle.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has one or more cylinders.
  • the motor vehicle has a fuel reservoir 10 in which fuel is stored for the operation of the internal combustion engine.
  • the fuel injection device has a feed pump 12, through which fuel is fed from the fuel tank 10 to at least one high-pressure pump 14.
  • the high-pressure pump 14 pumps fuel into a reservoir 16, which can be tubular, for example, or in any other form.
  • Lines 18 lead from the store 16 to injectors 20 arranged on the cylinders of the internal combustion engine. There is one on each of the injectors 20 electrical .
  • Control valve 22 is arranged, through which an opening of the injectors is controlled so as to effect fuel injection by the respective injector 20 or to prevent fuel injection.
  • the control valves.-22 are controlled by an electronic
  • Control device 23 is controlled by which the time and duration of the fuel injection by the injectors 20 is determined as a function of operating parameters of the internal combustion engine, such as speed, load, temperature and others.
  • a return for unused fuel leads from the injectors 20, at least indirectly, for example via a line 24 common to all injectors, into a return leading to the fuel reservoir 10.
  • a line 26 can also return from the reservoir 16 as a return to the fuel reservoir 10, in which a pressure limiting valve 28 is arranged in order to prevent an inadmissibly high pressure from building up in the reservoir 16.
  • the high pressure pump 14 is mechanically by the
  • the feed pump 12 can also be driven mechanically by the internal combustion engine, wherein a common drive shaft can be provided for the high pressure pump 14 and the feed pump 12.
  • the feed pump 12 may alternatively also have an electric motor drive, for example.
  • the high-pressure pump 14 can be designed as a radial piston pump and has at least one, preferably a plurality of pump elements 30 arranged at a uniform angular distance from one another, each of which has a pump piston 34 driven in a stroke movement by a polygon 32 in connection with an eccentric shaft and guided in a cylinder bore 33, the one
  • a check valve 38 opening towards the accumulator 16 is arranged as an outlet valve, by means of which the separation between the pump work chamber 36 and the accumulator 16 takes place during the suction stroke of the pump piston 34.
  • Pump work chamber 36 with the feed pump 12 is a check valve 39 opening towards the pump work chamber 36 as a suction valve, through which the separation between the pump work chamber 36 and the feed pump 12 takes place during the delivery stroke of the pump piston 34.
  • Fuel reservoir 10 are preferably arranged one or more filters.
  • a coarse filter 40 can be provided first, followed by a fine filter 42, whereby the fine filter 42 or the coarse filter 40 can additionally have a water separator.
  • the return line 24 of the injectors 20 can also lead into the line between the filter 40 and the feed pump 12.
  • a fuel metering device 44 is arranged between the feed pump 12 and the high pressure pump 14.
  • the fuel metering device 44 has, for example, an electrical actuator 45, preferably one
  • Electromagnets or a piezo actuator, operated Control valve 46 through which the flow from the feed pump 12 to the high pressure pump 14 is continuously adjustable.
  • the fuel metering device 44 is also controlled by the control device 23, in such a way that a fuel quantity is supplied to the high-pressure pump 14 by the feed pump 12, which in turn is then pumped under high pressure into the memory 16 by the high-pressure pump 14 in order to have a predetermined value in the memory 16 to maintain pressure dependent on operating parameters of the internal combustion engine.
  • a pressure sensor 17 is arranged on the accumulator 16, which is connected to the control device 23 and which supplies a signal for the actual pressure in the accumulator 16.
  • the fuel metering device 44 is shown enlarged according to a first embodiment.
  • the fuel metering device 44 has a valve housing 50, in which a valve member 54 designed as a hollow piston is displaceably guided in a cylinder bore 52.
  • the valve member 54 is cup-shaped, the bottom 55 and the jacket of which may also be separate components which are connected to one another.
  • the bottom 55 of the valve member 54 can also form a magnet armature of the actuator 45.
  • the bottom 55 of the valve member 54 has at least one opening 57.
  • an opening 56 of an outlet leading to the high-pressure pump 14 opens into the cylinder bore 52 in the valve housing 50 at least approximately axially.
  • the valve member 54 faces the opening 56 with its open side.
  • the valve member is through the at least one opening 57 in the base 55
  • the actuator 45 engages it.
  • a support disk 58 is inserted, for example pressed in, into the cylinder bore 52, between which and the bottom of the valve member 54 a spring 60 is clamped, which plunges into the valve member 54.
  • the position of the support disk 58 can be adjustable in the direction of the longitudinal axis 53 of the cylinder bore 52 so as to enable the prestressing of the spring 60 to be adjusted.
  • the support disk 58 has an opening for the passage of the fuel escaping through the opening 56.
  • An inlet from the pressure side of the feed pump 12 opens into the jacket of the cylinder bore 52 with at least one opening 62.
  • a plurality of openings 62 can also be provided, which are arranged distributed over the circumference of the cylinder bore 52.
  • the opening 62 can be formed as a slot extending over part of the circumference of the cylinder bore 52.
  • the valve member 54 has in its jacket according to the arrangement and number of openings 62 of the cylinder bore 52 at least one opening 64, which can also be formed as a slot extending over part of the circumference of the valve member 54. Through the valve member 54 with its at least one opening 64 in cooperation with the at least one
  • Opening 62 of the cylinder bore 52 controls the size of a flow cross section in the connection between the feed pump 12 and the high pressure pump 14.
  • a flow cross section of different sizes is released.
  • the size of the flow cross section is changed by the valve member 54 depending on its position in the direction of the longitudinal axis 53 of the cylinder bore 52.
  • the valve member 54 is shown in an axial position in which its opening 64 completely overlaps with the opening 62 of the cylinder bore 52 and thus the maximum flow cross-section is released.
  • the valve member 54 is shown in an axial position in which it is displaced to the left by the actuator 45 against the spring 60 and the opening 64 is no longer in Overlap with the opening 62 of the cylinder bore 52, so that the flow cross section is closed.
  • At least one further opening 66 from which a connection leads to a relief area, opens out on the jacket of the cylinder bore 52 in the direction of the longitudinal axis 53 of the cylinder bore 52 to the opening 62, offset from the support disk 58.
  • a return line 24 to the fuel storage container 10 or, as shown in broken lines in FIG. 1, the suction side of the feed pump 12 can serve as the relief region.
  • the valve member 54 has at least one further opening 68 offset in its jacket in the direction of the longitudinal axis 53 toward the opening 64 towards the bottom. Through the valve member 54, the connection to the relief region is controlled with its opening 68.
  • the openings 66, 68 in the cylinder bore 52 and in the valve member 54 are arranged such that the opening 68 is not in register with the opening 66 when the valve member 54 is in axial positions, in which a flow cross-section at the openings 62, 64 is released as shown in Figure 2. In this position of the valve member 54, the connection to the relief region is closed thereby, so that fuel delivered by the feed pump 12 can only reach the high-pressure pump 14.
  • Flow cross-section is released while the connection to the relief area remains closed.
  • the fuel metering device 44 maintains the delivery pressure of the delivery pump 12. This ensures a reliable setting of the pressure in the accumulator 16 by the fuel metering device 44, since only a small amount in the feed from the feed pump 12 to the latter
  • the inlet from the feed pump 12 and the outlet to the high pressure pump 14 are interchanged.
  • the inlet from the feed pump 12 then opens axially into the cylinder bore 52 in the opening 56 and the outlet to the high-pressure pump 14 opens into the cylinder bore 52 in the openings 62.
  • the inlet from the feed pump 12 is thus through the valve member 54 connected to the relief area.
  • FIG. 4 shows the fuel metering device according to a second exemplary embodiment, in which the structure is essentially the same as in the first exemplary embodiment.
  • the valve member 54 in the second exemplary embodiment has only the at least one opening 64 through which the size of the flow cross section between the feed pump 12 and the high-pressure pump 14 is controlled.
  • the cylinder bore 52 has in its jacket the at least one opening 62 and the at least one further opening 66 which is arranged at a relatively large axial distance therefrom and which forms the connection to the relief region.
  • the opening of the opening 66 and thus the connection to the relief area is controlled by the valve member 54 with its jacket such that the opening 66 is closed when the valve member 54 completely overlaps the opening 66 and that the opening 66 is opened when the valve member 54 does not or only partially covers the opening 66.
  • the opening 66 and thus the connection to the relief region is closed by the valve member 54 as long as a flow cross-section is released by the valve member 54 with the openings 62, 64. Only when the flow cross-section at the openings 62, 64 is at least approximately closed by the valve member 54, is the opening 66 and thus the connection to the relief region released.
  • the inlet from the feed pump 12 and the outlet to the high-pressure pump 14 can also be interchanged in the second embodiment, so that the inlet in the opening 56 and the outlet in the openings 62 open into the cylinder bore 52.
  • FIG. 5 shows the fuel metering device according to a third exemplary embodiment, in which the structure is again essentially the same as in the first exemplary embodiment. Different from the first
  • Embodiment opens the inlet of the Delivery pump 12 forth in an axially arranged opening 156, for example, into the cylinder bore 152 and at least one opening 162 of the outlet to the high-pressure pump 14 opens out at the jacket of the cylinder bore 152.
  • At the jacket of the cylinder bore 152 at least one further opening opens in the axial direction to the opening 162 166, which connects to a relief area.
  • the valve member 154 ' has at least one opening 164 in its jacket, which in cooperation with the opening 162 controls the flow cross section of the connection between the feed pump 12 and the high pressure pump 14.
  • the valve member 154 has in its jacket at least one groove 168 running in the direction of the longitudinal axis 153 and over part of the circumference, through which a connection between the opening 162 and the opening 166 is controlled. If a flow cross-section is released through the valve member 154 at the openings 162, 164, the groove 168 is not in register with the opening 162, so that fuel can only reach the high-pressure pump 14 from the feed pump 12 through the openings 162, 164. If through that
  • Valve member 154 of the flow cross-section is at least approximately completely closed, since the opening 164 no longer or almost no longer overlaps the opening 162, the groove 168 is in overlap with the opening 162 and establishes a connection to the opening 166. Fuel then flows from port 162 directly to port 166 and into the relief area.
  • the inlet from the feed pump 12 and the outlet to the high-pressure pump 14 can be interchanged, so that the inlet from the feed pump 12 in the openings 162 and the outlet in the opening 156 in the Cylinder bore 152 opens.
  • the actuator 45 of the fuel metering device 44 is controlled by the control device 23 such that the valve member 54 or 154 the flow cross-section of the connection between the feed pump 12 and the high-pressure pump 14 closes completely and the sequence of the
  • Fuel metering device 44 to the high pressure pump 14 is connected to the relief area. There is therefore only a low pressure on the suction side of the high-pressure pump 14 with zero delivery. Only a small amount of fuel passes through the fuel metering device 44 as a result of a possible leakage between the valve member 54 or 154 and the cylinder bore 52 or 152, which can flow off to the relief area. This enables a low opening pressure of the suction valve 39 of the at least one pump element of the high-pressure pump 14 to be set. This in turn enables a good filling of the pump working space 36 and a good pump delivery rate when the fuel is pumped by the high-pressure pump 14.
  • the spring 60 can be designed with a relatively high rigidity, as a result of which an advantageous characteristic curve of the fuel metering device 44 and thus of the high-pressure pump 14 can be achieved.
  • a large opening 64 or 164 can be opened
  • connection between the feed pump 12 and the high pressure pump 14 can be upstream of the
  • Fuel metering device 44 discharges a bypass connection 70 into a drive area of high-pressure pump 14, in which a throttle point 72 and a pressure valve 74 are arranged. If there is a sufficiently high pressure downstream of the feed pump 12, the pressure valve 74 opens and releases the bypass connection 70. About the Bypass connection 70 is supplied to the drive area of high-pressure pump 14 for lubrication thereof. The throttle point 72 limits the amount of fuel that flows through the bypass connection 70. Fuel flows from the drive area to the return
  • Fuel tank 10 from. It can be provided that a pressure-increasing device 76 is arranged between the accumulator 16 and the injectors 20, by means of which the pressure prevailing in the accumulator 16 is increased, so that fuel injection by the injectors 20 is higher
  • a return line 78 can lead away from the pressure increasing device 76 and opens into the connection between the feed pump 12 and the high pressure pump 14 upstream of the fuel metering device 44.
  • a check valve 80 which opens towards the connection is arranged in the return 78.
  • a further bypass connection 82 may be located upstream dissipate with a restrictor 83 to a return to the fuel reservoir 10, which allows venting before the fuel metering 44th
  • a further bypass connection 84 can lead away from the connection between the feed pump 12 and the high-pressure pump 14 upstream of the fuel metering device 44, which leads to the suction side of the feed pump 12 or into the return line 24 and into which one leads to the suction side of the feed pump 12 or to the return line 24 towards opening pressure valve 85 is arranged.
  • the bypass connection 84 with the pressure valve 85 limits the pressure prevailing in the connection between the delivery pump 12 and the high-pressure pump 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un système d'injection de carburant comportant une pompe de refoulement (12), à l'aide de laquelle du carburant est refoulé vers le côté admission d'une pompe haute pression (14). Ladite pompe haute pression (14) refoule du carburant dans un réservoir (16), en fonction de paramètres de fonctionnement du moteur à combustion interne. Ledit système comprend un dispositif de dosage du carburant (44) pour ajuster la quantité de carburant refoulée par la pompe haute pression (14) dans le réservoir (16). Ledit dispositif de dosage du carburant présente un actionneur (45) et une soupape de régulation (46) qu'il actionne. La soupape de régulation (46) présente un élément de soupape (54) guidé dans un alésage cylindrique (52) d'une cage de soupape (50), qui peut être déplacé par l'actionneur (45) à l'encontre d'une force de rappel (60) et régule, de manière concourante avec une ouverture (62) d'une conduite d'amenée partant de la pompe de refoulement (12) ou d'un orifice de sortie en direction de la pompe haute pression (14), ladite ouverture débouchant au niveau de l'enveloppe extérieure de l'alésage cylindrique (52), une section transversale d'écoulement, dans la jonction entre la pompe de refoulement (129 et la pompe haute pression (14).
EP03724838A 2002-09-25 2003-03-18 Systeme d'injection de carburant pour moteur a combustion interne Withdrawn EP1546544A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10244551 2002-09-25
DE10244551A DE10244551A1 (de) 2002-09-25 2002-09-25 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
PCT/DE2003/000883 WO2004029447A1 (fr) 2002-09-25 2003-03-18 Systeme d'injection de carburant pour moteur a combustion interne

Publications (1)

Publication Number Publication Date
EP1546544A1 true EP1546544A1 (fr) 2005-06-29

Family

ID=31984042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03724838A Withdrawn EP1546544A1 (fr) 2002-09-25 2003-03-18 Systeme d'injection de carburant pour moteur a combustion interne

Country Status (5)

Country Link
US (1) US7156076B2 (fr)
EP (1) EP1546544A1 (fr)
JP (1) JP2006500504A (fr)
DE (1) DE10244551A1 (fr)
WO (1) WO2004029447A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343480A1 (de) * 2003-09-19 2005-04-14 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
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US20050241616A1 (en) 2005-11-03
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JP2006500504A (ja) 2006-01-05
US7156076B2 (en) 2007-01-02

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