EP1357285A2 - Fuel injection system for internal combustion engine - Google Patents

Fuel injection system for internal combustion engine Download PDF

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Publication number
EP1357285A2
EP1357285A2 EP03004641A EP03004641A EP1357285A2 EP 1357285 A2 EP1357285 A2 EP 1357285A2 EP 03004641 A EP03004641 A EP 03004641A EP 03004641 A EP03004641 A EP 03004641A EP 1357285 A2 EP1357285 A2 EP 1357285A2
Authority
EP
European Patent Office
Prior art keywords
pump
fuel
pressure pump
high pressure
valve
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Withdrawn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
EP03004641A
Other languages
German (de)
French (fr)
Other versions
EP1357285A3 (en
Inventor
Burkhard Boos
Stefan Kieferle
Mattias Distel
Achim Koehler
Sascha Ambrock
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 EP1357285A2 publication Critical patent/EP1357285A2/en
Publication of EP1357285A3 publication Critical patent/EP1357285A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • 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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/08—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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

Definitions

  • the invention is based on one Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is by DE 198 53 103 A1 known.
  • This fuel injector has a high pressure pump through which fuel is submerged High pressure is pumped into a store. With the store are arranged on cylinders of the internal combustion engine Connected injectors. A feed pump is provided through the fuel from a fuel tank Suction side of the high pressure pump is promoted. Still is one controlled by an electronic control device Fuel metering device provided in the connection between the delivery side of the delivery pump and the suction side of the High pressure pump is arranged. The Fuel metering device is used to control the through the High-pressure pump fuel quantity pumped into the store depending on the operating parameters of the internal combustion engine.
  • the Fuel metering device has a control valve that has a slide-shaped valve member, which by a Electromagnet is movable against a return spring.
  • the Valve element controls in cooperation with one Drain opening of the valve housing via its outer jacket a flow cross-section in the connection of the feed pump to the high pressure pump. This results in a Throttling of the inflow to the high pressure pump Fuel flow.
  • the pressure generated by the feed pump falls off, so that the high pressure pump only partially is filled.
  • the high pressure pump thereby has one bad delivery rate. Under certain Operating conditions of the internal combustion engine, for example in overrun, the high pressure pump must not Fuel can be pumped into the memory, this State is referred to as zero funding.
  • the fuel injection device with the Features according to claim 1 has the advantage that through the design of the control valve as a timing valve none Throttling of the suction side of the high pressure pump Fuel occurs, causing the filling and the degree of delivery the high pressure pump are improved.
  • the Clock valve of the feed from the feed pump to the suction side of the High pressure pump completely closed in a simple manner are, as indicated in claim 2, so that none additional measures are required to Ensure zero delivery of the high pressure pump the structure of the fuel injector is simplified and their efficiency is improved.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation
  • Figure 2 is a diagram of timing of a clock valve Fuel injector.
  • FIG. 1 is a fuel injection device for a Internal combustion engine, for example of a motor vehicle shown.
  • the internal combustion engine is preferably one self-igniting internal combustion engine and has one or several cylinders.
  • the motor vehicle has one Fuel tank 10 in which fuel for the Operation of the internal combustion engine is stored.
  • the Fuel injection device has a feed pump 12 on, through the fuel from the fuel tank 10 via a connection 13 to the suction side of a High pressure pump 14 is promoted.
  • the high pressure pump 14 delivers fuel to a memory 16, for example be tubular or in any other form can. Lines 18 lead from memory 16 to the Injectors 20 arranged in cylinders of the internal combustion engine from.
  • Control valve 22 arranged through an opening of the Injectors are controlled so as to fuel injection to effect by the respective injector 20 or To prevent fuel injection.
  • the control valves 22 are controlled by an electronic control device 23 controlled by the depending on Operating parameters of the internal combustion engine, such as for example speed, load, temperature and other, the Time and duration of fuel injection by the Injectors 20 is determined.
  • the high pressure pump 14 is mechanically by the Internal combustion engine and therefore proportional to the speed of the Internal combustion engine driven.
  • the feed pump 12 can also mechanically by the internal combustion engine are driven, being for the high pressure pump 14 and Feed pump 12, a common drive shaft can be provided can.
  • the feed pump 12 can alternatively also, for example have an electric motor drive.
  • the high pressure pump 14 can be designed as a radial piston pump be and has several, for example three evenly spaced from each other Pump elements 30, each one by one common drive 32 driven in one stroke
  • the Drive 32 can be, for example, an eccentric shaft and a through this move polygon on which the Support pump piston 34 of pump elements 30.
  • an outlet valve 38 In the Connections of the pump work rooms 36 to the reservoir 16 is an outlet valve 38 in the form of a to the memory 16 arranged opening check valve through which the Separation between the pump work rooms 36 and the Storage 16 takes place during the suction stroke of the pump piston 34.
  • the feed pump 12 In the Connections of the pump work rooms 36 to the pressure side the feed pump 12 is an inlet valve 39 in the form one opening to the pump work rooms 36 Check valve arranged through which the separation between the pump work rooms 36 and the feed pump 12 during the delivery stroke of the pump piston 34.
  • the pump pistons 34 During one respective suction strokes of the pump pistons 34, if these are moving radially inward are the pump work spaces 36 when the inlet valves 39 are open with the outlet of the Feed pump 12 connected and are filled with fuel, the pump work spaces 36 through the closed Exhaust valves 38 are separated from the memory 16. While a respective delivery stroke of the pump piston 34, if this the pump work rooms are moving radially outwards 36 with the outlet 16 when the outlet valves 38 are open connected and through the closed inlet valves 39 of the pressure side of the feed pump 12 separated.
  • the fuel injector also has one Fuel meter 44 on between the Pressure side of the feed pump 12 and the suction side of the High pressure pump 14 is arranged.
  • the Fuel metering device 44 is electric actuated clock valve formed, the actuator 45, for example an electromagnet or a piezo actuator, having.
  • the clock valve 44 can be used as a 2/2-way valve be trained.
  • the actuator 45 is by the Control device 23 controlled, the clock valve 44 between an open switch position in which the Connection between the pressure side of the feed pump 12 and the suction side of the high pressure pump 14 is fully open, and a closed switch position in which the connection between the pressure side of the feed pump 12 and the suction side the high pressure pump 14 is completely separate, switchable is.
  • the fuel metering device 44 is operated by the Control device 23 controlled pulse width modulated in the Way that the opening duration of the clock valve 44 is so long that the high pressure pump 14 a defined amount of fuel is fed, which in turn by the high pressure pump 14 is promoted under high pressure in the memory 16 to in Memory 16 a predetermined, of operating parameters Maintain internal combustion engine dependent pressure.
  • a pressure sensor 17 is arranged, which with is connected to the control device 23, which thus signals receives about the actual pressure in the memory 16 and the Setting the duration of the clock valve 44 so that the Flow of fuel to the high pressure pump 14 so is set so that the predetermined pressure in the memory 16 is achieved.
  • the timing valve 44 is controlled by the control device 23 preferably as shown in Figure 2 in synchronism with the suction stroke h the pump piston 34 of the pump elements 30 is activated, such that the opening duration D of the clock valve 44 during of the suction stroke h of the pump piston 34 of a respective one Pump element 30 is so large that the pump piston 34 a Sucks amount of fuel into the pump workspace 36, the in the subsequent delivery stroke of the pump piston 34 in the Memory 16 is promoted to 16 in the memory maintain predetermined pressure.
  • the bigger the Amount of fuel that is by the high pressure pump 14 or whose pump elements 30 are conveyed into the memory 16 the longer the opening period D of the cycle valve becomes 44 set by the control device 23.
  • Cycle valve 44 at the beginning of each suction stroke Pump element 30 is initially closed and during the Suction strokes are opened so that the required Amount of fuel is sucked through the pump element 30.
  • the frequency of the pulse width modulation of the clock valve 44 is thereby synchronous with the speed of the high pressure pump 14 set.
  • the high pressure pump 14 required opening time of the clock valve 44 when controlled is so short for each pump element 30 that it is due to the inertia of the clock valve 44 no longer correct can be set, it can be provided that how shown at C in Figure 2 only for every second Pump element 30, the clock valve 44 is opened. in this connection the timing valve 44 remains for a pump element 30 completely closed and will for a following Pump element 30 opened.
  • the period of the control of the clock valve 44 is in Figure 2 at C again with T designated.
  • the frequency of the Pulse width modulation of the clock valve 44 in synchronism with one Multiples of the speed of the high pressure pump 14 are set.
  • the timing valve 44 is not in controlled by the control device 23, the means in a de-energized state, in its open state Switch position and when activated by the Control device 23, that is, in the voltage-loaded State is brought into its closed switching position.
  • the Clock valve 44 in not by the control device 23 controlled state, that is in a de-energized state, is in its closed switching position and at Control by the control device 23, that is in stressed state, in its open Switch position is brought.
  • the pulse duty factor for pulse width modulated control of the clock valve 44 that is the ratio of the actuated Time period for the uncontrolled time period and thus that Ratio of the open period to the closed one Duration of the suction stroke of the pump elements 30 can be in Shape of a map as a function of the High pressure pump 14 to be promoted in the memory 16 Fuel quantity can be stored in the control device 23.
  • bypass connection 48 leading to a relief area leads, for example, the suction side of the feed pump 12 can serve.
  • a Relief area opening pressure valve 50 is arranged in the bypass connection 48. If no full delivery by the high pressure pump 14 should take place and the clock valve 44 is not constantly open becomes, the pressure between the feed pump 12 and the timing valve 44 and when the opening pressure of the Pressure valve 50 is exceeded, fuel flows to Suction side of the feed pump 12 back.
  • a further bypass connection 52 to one Low pressure range than, for example, a return 54 can serve in the fuel tank 10.
  • a throttle point 56 intended in the further bypass connection 52 is one Venting the connection 13 between the feed pump 12 and the high pressure pump 14 allows.
  • a lubrication connection 58 to the drive 32 of the high pressure pump 14, through which the drive 32 fuel for lubrication is fed.
  • a Pressure valve 60 arranged, which only when a predetermined pressure opens and the lubrication connection 58th releases. This ensures that in particular when starting the internal combustion engine, if by the Feed pump 12 must first be built up pressure fuel delivered by the high-pressure pump 14 is supplied and not via the lubrication connection 58 Fuel is diverted.
  • a throttle point 62 through which the Drive 32 supplied amount of fuel is limited. from Guide drive 32 of high pressure pump 14 Relief connections 64 to the return 54 in which each a throttle point 66 or one to the return 54 opening pressure valve 68 is arranged.
  • the fuel injector can also at least have a pressure booster 70 which between the memory 16 and the injectors 20 is arranged and through which the pressure of the injectors 20 and for fuel injection compared to that in Memory 16 prevailing pressure is increased again. It can a separate one for each injector 20 Pressure increasing device 70 may be provided, which in the Injector 20 can be integrated.

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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)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The device has a high pressure pump, a storage device connected to injectors, a delivery pump and a clock valve fuel dosing device opened and closed under pulse width control. The fuel quantity fed to the high pressure pump suction side is proportional to the valve's opening duration and the pulse width modulation frequency is adjusted preferably in synchronism with the high pressure pump revolution rate or a multiple of the revolution rate. The device has a high pressure pump (14) feeding fuel under high pressure to a storage device (16) connected to injectors (20), a delivery pump (12) feeding fuel to the high pressure pump from a tank (10), a fuel dosing device controlled by a controller to set the fuel feed rate to the suction side of the high pressure pump. The dosing device is a clock valve opened and closed under pulse width control. The fuel quantity fed to the suction side of the high pressure pump is proportional to the valve's opening duration and the pulse width modulation frequency is adjusted preferably in synchronism with the high pressure pump revolution rate or a multiple of the revolution rate.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention is based on one Fuel injection device for an internal combustion engine according to the preamble of claim 1.

Eine solche Kraftstoffeinspritzeinrichtung ist durch die DE 198 53 103 A1 bekannt. Diese Kraftstoffeinspritzeinrichtung weist eine Hochdruckpumpe auf, durch die Kraftstoff unter Hochdruck in einen Speicher gefördert wird. Mit dem Speicher sind an Zylindern der Brennkraftmaschine angeordnete Injektoren verbunden. Es ist eine Förderpumpe vorgesehen, durch die Kraftstoff aus einem Kraftstoffvorratsbehälter zur Saugseite der Hochdruckpumpe gefördert wird. Weiterhin ist eine durch eine elektronische Steuereinrichtung angesteuerte Kraftstoffzumeßeinrichtung vorgesehen, die in der Verbindung zwischen der Druckseite Förderpumpe und der Saugseite der Hochdruckpumpe angeordnet ist. Die Kraftstoffzumeßeinrichtung dient zur Steuerung der durch die Hochdruckpumpe in den Speicher geförderten Kraftstoffmenge abhängig von Betriebsparametern der Brennkraftmaschine. Die Kraftstoffzumeßeinrichtung weist ein Regelventil auf, das ein schieberförmiges Ventilglied aufweist, das durch einen Elektromagneten gegen eine Rückstellfeder bewegbar ist. Das Ventilglied steuert in Zusammenwirkung mit einer Ablauföffnung des Ventilgehäuses über seinen Außenmantel hubabhängig einen Durchflußquerschnitt in der Verbindung von der Förderpumpe zur Hochdruckpumpe. Hierdurch erfolgt eine Drosselung des der Hochdruckpumpe zufließenden Kraftstoffstroms. Der von der Förderpumpe erzeugte Druck fällt dabei ab, so daß die Hochdruckpumpe nur teilweise befüllt wird. Die Hochdruckpumpe weist hierdurch einen schlechten Liefergrad auf. Unter bestimmten Betriebsbedingungen der Brennkraftmaschine, beispielsweise im Schubbetrieb, darf durch die Hochdruckpumpe kein Kraftstoff in den Speicher gefördert werden, wobei dieser Zustand als Nullförderung bezeichnet wird. Es kann jedoch nicht sichergestellt werden, daß durch das Regelventil der Zulauf von Kraftstoff von der Förderpumpe zur Hochdruckpumpe vollständig verschlossen wird, so daß zusätzliche Maßnahmen erforderlich sind, um den von der Förderpumpe geförderten und durch das Regelventil hindurchtretenden Kraftstoff abzuführen, damit dieser nicht durch die Hochdruckpumpe in den Speicher gefördert wird und die Nullförderung erreicht wird. Durch diese zusätzlichen Maßnahmen wird wiederum der Wirkungsgrad der Kraftstoffeinspritzeinrichtung verschlechtert, da ständig ein Teil des durch die Förderpumpe geförderten Kraftstoffs als Leckagestrom abfließt.Such a fuel injection device is by DE 198 53 103 A1 known. This fuel injector has a high pressure pump through which fuel is submerged High pressure is pumped into a store. With the store are arranged on cylinders of the internal combustion engine Connected injectors. A feed pump is provided through the fuel from a fuel tank Suction side of the high pressure pump is promoted. Still is one controlled by an electronic control device Fuel metering device provided in the connection between the delivery side of the delivery pump and the suction side of the High pressure pump is arranged. The Fuel metering device is used to control the through the High-pressure pump fuel quantity pumped into the store depending on the operating parameters of the internal combustion engine. The Fuel metering device has a control valve that has a slide-shaped valve member, which by a Electromagnet is movable against a return spring. The Valve element controls in cooperation with one Drain opening of the valve housing via its outer jacket a flow cross-section in the connection of the feed pump to the high pressure pump. This results in a Throttling of the inflow to the high pressure pump Fuel flow. The pressure generated by the feed pump falls off, so that the high pressure pump only partially is filled. The high pressure pump thereby has one bad delivery rate. Under certain Operating conditions of the internal combustion engine, for example in overrun, the high pressure pump must not Fuel can be pumped into the memory, this State is referred to as zero funding. However, it can not be ensured that the control valve Fuel feed from the feed pump to the high pressure pump is completely closed, so that additional measures are required to be the one pumped by the feed pump and fuel passing through the control valve dissipate so that it is not in storage is promoted and zero funding is achieved becomes. Through these additional measures, the Efficiency of the fuel injector deteriorated because part of the constant through the Delivery pump of fuel delivered as a leakage flow flows.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzeinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, daß durch die Ausbildung des Steuerventils als Taktventil keine Drosselung des der Saugseite der Hochdruckpumpe zugeführten Kraftstoffs auftritt, wodurch die Füllung und der Liefergrad der Hochdruckpumpe verbessert sind. Außerdem kann durch das Taktventil der Zulauf von der Förderpumpe zur Saugseite der Hochdruckpumpe auf einfache Weise vollständig verschlossen werden, wie dies im Anspruch 2 angegeben ist, so daß keine zusätzlichen Maßnahmen erforderlich sind, um die Nullförderung der Hochdruckpumpe sicherzustellen, wodurch der Aufbau der Kraftstoffeinspritzeinrichtung vereinfacht und deren Wirkungsgrad verbessert ist.The fuel injection device according to the invention with the Features according to claim 1 has the advantage that through the design of the control valve as a timing valve none Throttling of the suction side of the high pressure pump Fuel occurs, causing the filling and the degree of delivery the high pressure pump are improved. In addition, through the Clock valve of the feed from the feed pump to the suction side of the High pressure pump completely closed in a simple manner are, as indicated in claim 2, so that none additional measures are required to Ensure zero delivery of the high pressure pump the structure of the fuel injector is simplified and their efficiency is improved.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffeinspritzeinrichtung angegeben. Durch die Ausbildung gemäß Anspruch 3 ist sichergestellt, daß von der Förderpumpe zu viel geförderter Kraftstoff, der nicht der Saugseite der Hochdruckpumpe zugeführt wird, abgeführt werden kann. Durch die Ausbildung gemäß Anspruch 4 ist eine ausreichende Schmierung des Antriebs der Hochdruckpumpe sichergestellt auch wenn diese keinen Kraftstoff fördert. Die Ausbildung gemäß Anspruch 5 ermöglicht eine Entlüftung der Verbindung zwischen der Förderpumpe und der Saugseite der Hochdruckpumpe.In the dependent claims are advantageous Refinements and developments of the invention Fuel injector specified. Through the Training according to claim 3 ensures that the Delivery pump too much fuel delivered, which is not the Suction side of the high pressure pump is fed, discharged can be. By training according to claim 4 is a adequate lubrication of the drive of the high pressure pump ensured even if it does not deliver fuel. The training according to claim 5 enables ventilation the connection between the feed pump and the suction side the high pressure pump.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung und Figur 2 ein Diagramm der zeitlichen Ansteuerung eines Taktventils der Kraftstoffeinspritzeinrichtung.An embodiment of the invention is in the drawing shown and in the description below explained. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation and Figure 2 is a diagram of timing of a clock valve Fuel injector.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine beispielsweise eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine ist vorzugsweise eine selbstzündende Brennkraftmaschine und weist einen oder mehrere Zylinder auf. Das Kraftfahrzeug weist einen Kraftstoffvorratsbehälter 10 auf, in dem Kraftstoff für den Betrieb der Brennkraftmaschine bevorratet ist. Die Kraftstoffeinspritzeinrichtung weist eine Förderpumpe 12 auf, durch die Kraftstoff aus dem Kraftstoffvorratsbehälter 10 über eine Verbindung 13 zur Saugseite einer Hochdruckpumpe 14 gefördert wird. Die Hochdruckpumpe 14 fördert Kraftstoff in einen Speicher 16, der beispielsweise rohrförmig oder in beliebiger anderer Form ausgebildet sein kann. Vom Speicher 16 führen Leitungen 18 zu an den Zylindern der Brennkraftmaschine angeordneten Injektoren 20 ab. An den Injektoren 20 ist jeweils ein elektrisches Steuerventil 22 angeordnet, durch das eine Öffnung der Injektoren gesteuert wird, um so eine Kraftstoffeinspritzung durch den jeweiligen Injektor 20 zu bewirken oder eine Kraftstoffeinspritzung zu verhindern. Die Steuerventile 22 werden durch eine elektronische Steuereinrichtung 23 angesteuert, durch die in Abhängigkeit von Betriebsparametern der Brennkraftmaschine, wie beispielsweise Drehzahl, Last, Temperatur und weiteren, der Zeitpunkt und die Dauer der Kraftstoffeinspritzung durch die Injektoren 20 bestimmt wird.In Figure 1 is a fuel injection device for a Internal combustion engine, for example of a motor vehicle shown. The internal combustion engine is preferably one self-igniting internal combustion engine and has one or several cylinders. The motor vehicle has one Fuel tank 10 in which fuel for the Operation of the internal combustion engine is stored. The Fuel injection device has a feed pump 12 on, through the fuel from the fuel tank 10 via a connection 13 to the suction side of a High pressure pump 14 is promoted. The high pressure pump 14 delivers fuel to a memory 16, for example be tubular or in any other form can. Lines 18 lead from memory 16 to the Injectors 20 arranged in cylinders of the internal combustion engine from. There is an electrical one at each of the injectors 20 Control valve 22 arranged through an opening of the Injectors are controlled so as to fuel injection to effect by the respective injector 20 or To prevent fuel injection. The control valves 22 are controlled by an electronic control device 23 controlled by the depending on Operating parameters of the internal combustion engine, such as for example speed, load, temperature and other, the Time and duration of fuel injection by the Injectors 20 is determined.

Die Hochdruckpumpe 14 wird mechanisch durch die Brennkraftmaschine und damit proportional zur Drehzahl der Brennkraftmaschine angetrieben. Die Förderpumpe 12 kann ebenfalls mechanisch durch die Brennkraftmaschine angetrieben werden, wobei für die Hochdruckpumpe 14 und die Förderpumpe 12 eine gemeinsame Antriebswelle vorgesehen sein kann. Die Förderpumpe 12 kann alternativ auch beispielsweise einen elektromotorischen Antrieb aufweisen.The high pressure pump 14 is mechanically by the Internal combustion engine and therefore proportional to the speed of the Internal combustion engine driven. The feed pump 12 can also mechanically by the internal combustion engine are driven, being for the high pressure pump 14 and Feed pump 12, a common drive shaft can be provided can. The feed pump 12 can alternatively also, for example have an electric motor drive.

Die Hochdruckpumpe 14 kann als Radialkolbenpumpe ausgebildet sein und weist mehrere, beispielsweise drei mit gleichmäßigem Winkelabstand voneinander angeordnete Pumpenelemente 30 auf, die jeweils einen durch einen gemeinsamen Antrieb 32 in einer Hubbewegung angetriebenen Pumpenkolben 34 aufweisen, der jeweils in einer Zylinderbohrung 35 einen Pumpenarbeitsraum 36 begrenzt. Der Antrieb 32 kann beispielsweise eine Exzenterwelle und ein durch diese bewegtes Polygon aufweisen, auf dem sich die Pumpenkolben 34 der Pumpenelemente 30 abstützen. In den Verbindungen der Pumpenarbeitsräume 36 mit dem Speicher 16 ist jeweils ein Auslaßventil 38 in Form eines zum Speicher 16 hin öffnenden Rückschlagventils angeordnet, durch das die Trennung zwischen den Pumpenarbeitsräumen 36 und dem Speicher 16 beim Saughub der Pumpenkolben 34 erfolgt. In den Verbindungen der Pumpenarbeitsräume 36 mit der Druckseite der Förderpumpe 12 ist jeweils ein Einlaßventil 39 in Form eines zu den Pumpenarbeitsräumen 36 hin öffnenden Rückschlagventils angeordnet, durch das die Trennung zwischen den Pumpenarbeitsräumen 36 und der Förderpumpe 12 beim Förderhub der Pumpenkolben 34 erfolgt. Während eines jeweiligen Saughubs der Pumpenkolben 34, wenn diese sich radial nach innen bewegen, sind die Pumpenarbeitsräume 36 bei geöffneten Einlaßventilen 39 mit dem Auslaß der Förderpumpe 12 verbunden und werden mit Kraftstoff befüllt, wobei die Pumpenarbeitsräume 36 durch die geschlossenen Auslaßventile 38 vom Speicher 16 getrennt sind. Während eines jeweiligen Förderhubs der Pumpenkolben 34, wenn diese sich radial nach außen bewegen, sind die Pumpenarbeitsräume 36 bei geöffneten Auslaßventilen 38 mit dem Speicher 16 verbunden und durch die geschlossenen Einlaßventile 39 von der Druckseite der Förderpumpe 12 getrennt.The high pressure pump 14 can be designed as a radial piston pump be and has several, for example three evenly spaced from each other Pump elements 30, each one by one common drive 32 driven in one stroke Have pump piston 34, each in a Cylinder bore 35 delimits a pump working space 36. The Drive 32 can be, for example, an eccentric shaft and a through this move polygon on which the Support pump piston 34 of pump elements 30. In the Connections of the pump work rooms 36 to the reservoir 16 is an outlet valve 38 in the form of a to the memory 16 arranged opening check valve through which the Separation between the pump work rooms 36 and the Storage 16 takes place during the suction stroke of the pump piston 34. In the Connections of the pump work rooms 36 to the pressure side the feed pump 12 is an inlet valve 39 in the form one opening to the pump work rooms 36 Check valve arranged through which the separation between the pump work rooms 36 and the feed pump 12 during the delivery stroke of the pump piston 34. During one respective suction strokes of the pump pistons 34, if these are moving radially inward are the pump work spaces 36 when the inlet valves 39 are open with the outlet of the Feed pump 12 connected and are filled with fuel, the pump work spaces 36 through the closed Exhaust valves 38 are separated from the memory 16. While a respective delivery stroke of the pump piston 34, if this the pump work rooms are moving radially outwards 36 with the outlet 16 when the outlet valves 38 are open connected and through the closed inlet valves 39 of the pressure side of the feed pump 12 separated.

Die Kraftstoffeinspritzeinrichtung weist außerdem eine Kraftstoffzumeßeinrichtung 44 auf, die zwischen der Druckseite der Förderpumpe 12 und der Saugseite der Hochdruckpumpe 14 angeordnet ist. Die Kraftstoffzumeßeinrichtung 44 ist durch ein elektrisch betätigtes Taktventil gebildet, das einen Aktor 45, beispielsweise einen Elektromagneten oder einen Piezoaktor, aufweist. Das Taktventil 44 kann als 2/2-Wegeventil ausgebildet sein. Der Aktor 45 wird durch die Steuereinrichtung 23 angesteuert, wobei das Taktventil 44 zwischen einer geöffneten Schaltstellung, in der die Verbindung zwischen der Druckseite der Förderpumpe 12 und der Saugseite der Hochdruckpumpe 14 ganz geöffnet ist, und einer geschlossenen Schaltstellung, in der die Verbindung zwischen der Druckseite der Förderpumpe 12 und der Saugseite der Hochdruckpumpe 14 vollständig getrennt ist, umschaltbar ist. Die Kraftstoffzumeßeinrichtung 44 wird durch die Steuereinrichtung 23 pulsweitenmoduliert angesteuert, in der Weise, daß die Öffnungsdauer des Taktventils 44 so groß ist, daß der Hochdruckpumpe 14 eine definierte Kraftstoffmenge zugeführt wird, die dann wiederum durch die Hochdruckpumpe 14 unter Hochdruck in den Speicher 16 gefördert wird, um im Speicher 16 einen vorgegebenen, von Betriebsparametern der Brennkraftmaschine abhängigen Druck aufrechtzuerhalten. Am Speicher 16 ist dabei ein Drucksensor 17 angeordnet, der mit der Steuereinrichtung 23 verbunden ist, die somit Signale über den tatsächlichen Druck im Speicher 16 erhält und die Öffnungsdauer des Taktventils 44 derart einstellt, daß der Durchfluß von Kraftstoff zur Hochdruckpumpe 14 so eingestellt wird, daß der vorgegebene Druck im Speicher 16 erreicht wird.The fuel injector also has one Fuel meter 44 on between the Pressure side of the feed pump 12 and the suction side of the High pressure pump 14 is arranged. The Fuel metering device 44 is electric actuated clock valve formed, the actuator 45, for example an electromagnet or a piezo actuator, having. The clock valve 44 can be used as a 2/2-way valve be trained. The actuator 45 is by the Control device 23 controlled, the clock valve 44 between an open switch position in which the Connection between the pressure side of the feed pump 12 and the suction side of the high pressure pump 14 is fully open, and a closed switch position in which the connection between the pressure side of the feed pump 12 and the suction side the high pressure pump 14 is completely separate, switchable is. The fuel metering device 44 is operated by the Control device 23 controlled pulse width modulated in the Way that the opening duration of the clock valve 44 is so long that the high pressure pump 14 a defined amount of fuel is fed, which in turn by the high pressure pump 14 is promoted under high pressure in the memory 16 to in Memory 16 a predetermined, of operating parameters Maintain internal combustion engine dependent pressure. At the In the memory 16, a pressure sensor 17 is arranged, which with is connected to the control device 23, which thus signals receives about the actual pressure in the memory 16 and the Setting the duration of the clock valve 44 so that the Flow of fuel to the high pressure pump 14 so is set so that the predetermined pressure in the memory 16 is achieved.

Das Taktventil 44 wird durch die Steuereinrichtung 23 vorzugsweise wie in Figur 2 dargestellt synchron zum Saughub h der Pumpenkolben 34 der Pumpenelemente 30 angesteuert, derart, daß die Öffnungsdauer D des Taktventils 44 während des Saughubs h des Pumpenkolbens 34 eines jeweiligen Pumpenelements 30 so groß ist, daß der Pumpenkolben 34 eine Kraftstoffmenge in den Pumpenarbeitsraum 36 ansaugt, die beim darauffolgenden Förderhub des Pumpenkolbens 34 in den Speicher 16 gefördert wird, um im Speicher 16 den vorgegebenen Druck aufrechtzuerhalten. Je größer die Kraftstoffmenge ist, die durch die Hochdruckpumpe 14 bzw. deren Pumpenelemente 30 in den Speicher 16 gefördert werden soll, umso größer wird die Öffnungsdauer D des Taktventils 44 durch die Steuereinrichtung 23 eingestellt. In Figur 2 ist oben der über der Zeit t nacheinander erfolgende Saughub h für die verschiedenen Pumpenelemente 30 dargestellt. Bei A ist die Ansteuerung des Taktventils 44 mit einer Öffnungsdauer D für Vollförderung dargestellt, bei der das Taktventil 44 über den gesamten Saughub der Pumpenelemente 30 geöffnet ist. Bei B ist die Ansteuerung des Taktventils 44 mit einer Öffnungsdauer D bei Teilförderung, beispielsweise 50%-Förderung dargestellt. Die Periodendauer der Ansteuerung des Taktventils 44 ist in Figur 2 mit T bezeichnet. Es kann dabei vorgesehen sein, daß das Taktventil 44 wie in Figur 2 bei B dargestellt zu Beginn des Saughubs eines jeweiligen Pumpenelements 30 zunächst geöffnet ist und während des Saughubs geschlossen wird, wenn die erforderliche Kraftstoffmenge durch das Pumpenelement 30 angesaugt ist. Alternativ kann auch vorgesehen sein, daß das Taktventil 44 zu Beginn des Saughubs eines jeweiligen Pumpenelements 30 zunächst geschlossen ist und während des Saughubs geöffnet wird, so daß die erforderliche Kraftstoffmenge durch das Pumpenelement 30 angesaugt wird. Die Frequenz der Pulsweitenmodulation des Taktventils 44 ist dabei synchron zur Drehzahl der Hochdruckpumpe 14 eingestellt.The timing valve 44 is controlled by the control device 23 preferably as shown in Figure 2 in synchronism with the suction stroke h the pump piston 34 of the pump elements 30 is activated, such that the opening duration D of the clock valve 44 during of the suction stroke h of the pump piston 34 of a respective one Pump element 30 is so large that the pump piston 34 a Sucks amount of fuel into the pump workspace 36, the in the subsequent delivery stroke of the pump piston 34 in the Memory 16 is promoted to 16 in the memory maintain predetermined pressure. The bigger the Amount of fuel that is by the high pressure pump 14 or whose pump elements 30 are conveyed into the memory 16 the longer the opening period D of the cycle valve becomes 44 set by the control device 23. In Figure 2 above is the suction stroke taking place successively over time t h shown for the various pump elements 30. At a is the control of the clock valve 44 with a Opening time D shown for full funding, at which Cycle valve 44 over the entire suction stroke of the pump elements 30 is open. At B is the control of the clock valve 44 with an opening time D for partial funding, for example, 50% funding is shown. The period the control of the clock valve 44 is shown in Figure 2 with T designated. It can be provided that the Clock valve 44 as shown in Figure 2 at B at the beginning of Suction strokes of a respective pump element 30 initially is open and is closed during the suction stroke if the required amount of fuel by the pump element 30 is sucked in. Alternatively, it can also be provided that the Cycle valve 44 at the beginning of each suction stroke Pump element 30 is initially closed and during the Suction strokes are opened so that the required Amount of fuel is sucked through the pump element 30. The frequency of the pulse width modulation of the clock valve 44 is thereby synchronous with the speed of the high pressure pump 14 set.

Wenn bei hoher Drehzahl der Hochdruckpumpe 14 die erforderliche Öffnungsdauer des Taktventils 44 bei Steuerung für jedes Pumpenelement 30 separat so kurz ist, daß diese aufgrund der Trägheit des Taktventils 44 nicht mehr korrekt eingestellt werden kann, so kann vorgesehen sein, daß wie bei C in Figur 2 dargestellt nur für jedes zweite Pumpenelement 30 das Taktventil 44 geöffnet wird. Hierbei bleibt das Taktventil 44 für ein Pumpenelement 30 vollständig geschlossen und wird für ein folgendes Pumpenelement 30 geöffnet. Die Periodendauer der Ansteuerung des Taktventils 44 ist in Figur 2 bei C wiederum mit T bezeichnet. Hierbei wird die Frequenz der Pulsweitenmodulation des Taktventils 44 synchron zu einem Vielfachen der Drehzahl der Hochdruckpumpe 14 eingestellt.If at high speed the high pressure pump 14 required opening time of the clock valve 44 when controlled is so short for each pump element 30 that it is due to the inertia of the clock valve 44 no longer correct can be set, it can be provided that how shown at C in Figure 2 only for every second Pump element 30, the clock valve 44 is opened. in this connection the timing valve 44 remains for a pump element 30 completely closed and will for a following Pump element 30 opened. The period of the control of the clock valve 44 is in Figure 2 at C again with T designated. Here the frequency of the Pulse width modulation of the clock valve 44 in synchronism with one Multiples of the speed of the high pressure pump 14 are set.

Wenn durch die Hochdruckpumpe 14 kein Kraftstoff in den Speicher 16 gefördert werden darf, beispielsweise im Schubbetrieb der Brennkraftmaschine, so wird durch die Steuereinrichtung 23 das Taktventil 44 geschlossen gehalten, so daß kein Kraftstoff von der Hochdruckpumpe 14 angesaugt wird. Eine vollständige Dichtheit des Taktventils 44 und damit die vollständige Trennung der Saugseite der Hochdruckpumpe 14 von der Druckseite der Förderpumpe 10 durch das Taktventil 44 kann auf einfache Weise erreicht werden.If no fuel in the by the high pressure pump 14 Memory 16 may be promoted, for example in Thrust operation of the internal combustion engine, so is by the Control device 23 keeps the clock valve 44 closed, so that no fuel is sucked in by the high pressure pump 14 becomes. Complete tightness of the timing valve 44 and thus the complete separation of the suction side of the High pressure pump 14 from the pressure side of the feed pump 10 through the clock valve 44 can be achieved in a simple manner become.

Es kann vorgesehen sein, daß sich das Taktventil 44 in nicht durch die Steuereinrichtung 23 angesteuertem Zustand, das heißt in spannungslosem Zustand, in seiner geöffneten Schaltstellung befindet und bei Ansteuerung durch die Steuereinrichtung 23, das heißt in spannungsbeaufschlagtem Zustand, in seine geschlossene Schaltstellung gebracht wird. Alternativ kann auch vorgesehen sein, daß sich das Taktventil 44 in nicht durch die Steuereinrichtung 23 angesteuertem Zustand, das heißt in spannungslosem Zustand, in seiner geschlossenen Schaltstellung befindet und bei Ansteuerung durch die Steuereinrichtung 23, das heißt in spannungsbeaufschlagtem Zustand, in seine geöffnete Schaltstellung gebracht wird.It can be provided that the timing valve 44 is not in controlled by the control device 23, the means in a de-energized state, in its open state Switch position and when activated by the Control device 23, that is, in the voltage-loaded State is brought into its closed switching position. Alternatively, it can also be provided that the Clock valve 44 in not by the control device 23 controlled state, that is in a de-energized state, is in its closed switching position and at Control by the control device 23, that is in stressed state, in its open Switch position is brought.

Das Tastverhältnis für die pulsweitenmodulierte Ansteuerung des Taktventils 44, das ist das Verhältnis der angesteuerten Zeitdauer zur nicht angesteuerten Zeitdauer und damit das Verhältnis der geöffneten Zeitdauer zur geschlossenen Zeitdauer für den Saughub der Pumpenelemente 30, kann in Form eines Kennfeldes als Funktion der durch die Hochdruckpumpe 14 in den Speicher 16 zu fördernden Kraftstoffmenge in der Steuereinrichtung 23 abgelegt sein.The pulse duty factor for pulse width modulated control of the clock valve 44, that is the ratio of the actuated Time period for the uncontrolled time period and thus that Ratio of the open period to the closed one Duration of the suction stroke of the pump elements 30 can be in Shape of a map as a function of the High pressure pump 14 to be promoted in the memory 16 Fuel quantity can be stored in the control device 23.

Von der Verbindung 13 zwischen der Förderpumpe 12 und der Hochdruckpumpe 14 zweigt stromaufwärts vor dem Taktventil 44 eine Bypassverbindung 48 ab, die zu einem Entlastungsbereich führt, als der beispielsweise die Saugseite der Förderpumpe 12 dienen kann. In der Bypassverbindung 48 ist ein zum Entlastungsbereich hin öffnendes Druckventil 50 angeordnet. Wenn durch die Hochdruckpumpe 14 keine Vollförderung erfolgen soll und das Taktventil 44 nicht ständig geöffnet wird, so steigt der Druck zwischen der Förderpumpe 12 und dem Taktventil 44 an und wenn der Öffnungsdruck des Druckventils 50 überschritten wird, so fließt Kraftstoff zur Saugseite der Förderpumpe 12 zurück.From the connection 13 between the feed pump 12 and the High-pressure pump 14 branches upstream of the clock valve 44 a bypass connection 48 leading to a relief area leads, for example, the suction side of the feed pump 12 can serve. In the bypass connection 48 is a Relief area opening pressure valve 50 is arranged. If no full delivery by the high pressure pump 14 should take place and the clock valve 44 is not constantly open becomes, the pressure between the feed pump 12 and the timing valve 44 and when the opening pressure of the Pressure valve 50 is exceeded, fuel flows to Suction side of the feed pump 12 back.

Von der Verbindung 13 zwischen der Förderpumpe 12 und der Hochdruckpumpe 14 zweigt stromaufwärts vor dem Taktventil 44 außerdem eine weitere Bypassverbindung 52 zu einem Niederdruckbereich ab, als der beispielsweise ein Rücklauf 54 in den Kraftstoffvorratsbehälter 10 dienen kann. In der weiteren Bypassverbindung 52 ist eine Drosselstelle 56 vorgesehen. Durch die weitere Bypassverbindung 52 ist eine Entlüftung der Verbindung 13 zwischen der Förderpumpe 12 und der Hochdruckpumpe 14 ermöglicht.From the connection 13 between the feed pump 12 and the High-pressure pump 14 branches upstream of the clock valve 44 also a further bypass connection 52 to one Low pressure range than, for example, a return 54 can serve in the fuel tank 10. In the Another bypass connection 52 is a throttle point 56 intended. Through the further bypass connection 52 is one Venting the connection 13 between the feed pump 12 and the high pressure pump 14 allows.

Von der Verbindung 13 zwischen der Förderpumpe 12 und der Hochdruckpumpe 14 zweigt stromaufwärts vor dem Taktventil 44 eine Schmierverbindung 58 zum Antrieb 32 der Hochdruckpumpe 14 ab, durch die dem Antrieb 32 Kraftstoff zur Schmierung zugeführt wird. In der Schmierverbindung 58 ist ein Druckventil 60 angeordnet, das erst bei Überschreiten eines vorgegebenen Druckes öffnet und die Schmierverbindung 58 freigibt. Hierdurch ist sichergestellt, daß insbesondere beim Starten der Brennkraftmaschine, wenn durch die Förderpumpe 12 zunächst Druck aufgebaut werden muß, der durch diese geförderte Kraftstoff der Hochdruckpumpe 14 zugeführt wird und nicht über die Schmierverbindung 58 Kraftstoff abgezweigt wird. In der Schmierverbindung 58 ist außerdem eine Drosselstelle 62 vorgesehen, durch die die dem Antrieb 32 zugeführte Kraftstoffmenge begrenzt wird. Vom Antrieb 32 der Hochdruckpumpe 14 führen Entlastungsverbindungen 64 zum Rücklauf 54 ab, in denen jeweils eine Drosselstelle 66 oder ein zum Rücklauf 54 hin öffnendes Druckventil 68 angeordnet ist.From the connection 13 between the feed pump 12 and the High-pressure pump 14 branches upstream of the clock valve 44 a lubrication connection 58 to the drive 32 of the high pressure pump 14, through which the drive 32 fuel for lubrication is fed. In the lubrication connection 58 is a Pressure valve 60 arranged, which only when a predetermined pressure opens and the lubrication connection 58th releases. This ensures that in particular when starting the internal combustion engine, if by the Feed pump 12 must first be built up pressure fuel delivered by the high-pressure pump 14 is supplied and not via the lubrication connection 58 Fuel is diverted. In the lubrication connection 58 is also provided a throttle point 62 through which the Drive 32 supplied amount of fuel is limited. from Guide drive 32 of high pressure pump 14 Relief connections 64 to the return 54 in which each a throttle point 66 or one to the return 54 opening pressure valve 68 is arranged.

Die Kraftstoffeinspritzeinrichtung kann außerdem wenigstens eine Druckerhöhungseinrichtung 70 aufweisen, die zwischen dem Speicher 16 und den Injektoren 20 angeordnet ist und durch die der Druck des den Injektoren 20 zugeführten und zur Einspritzung gelangenden Kraftstoffs gegenüber dem im Speicher 16 herrschenden Druck nochmals erhöht wird. Es kann dabei für jeden Injektor 20 eine eigene Druckerhöhungseinrichtung 70 vorgesehen sein, die im Injektor 20 integriert sein kann.The fuel injector can also at least have a pressure booster 70 which between the memory 16 and the injectors 20 is arranged and through which the pressure of the injectors 20 and for fuel injection compared to that in Memory 16 prevailing pressure is increased again. It can a separate one for each injector 20 Pressure increasing device 70 may be provided, which in the Injector 20 can be integrated.

Claims (7)

Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine mit einer Hochdruckpumpe (14), durch die Kraftstoff in einen Speicher (16) gefördert wird, mit dem an Zylindern der Brennkraftmaschine angeordnete Injektoren (20) verbunden sind, mit einer Förderpumpe (12), durch die Kraftstoff aus einem Kraftstoffvorratsbehälter (10) zur Saugseite der Hochdruckpumpe (14) gefördert wird, und mit einer durch eine Steuereinrichtung (23) angesteuerten Kraftstoffzumeßeinrichtung (44), die zwischen der Druckseite der Förderpumpe (12) und der Saugseite der Hochdruckpumpe (14) angeordnet ist und durch die die der Saugseite der Hochdruckpumpe (14) zugeführte Kraftstoffmenge eingestellt wird, dadurch gekennzeichnet, daß die Kraftstoffzumeßeinrichtung durch ein Taktventil (44) gebildet ist, das durch die Steuereinrichtung (23) pulsweitenmoduliert geöffnet und geschlossen wird, wobei die der Saugseite der Hochdruckpumpe (14) zugeführte Kraftstoffmenge proportional zur Öffnungsdauer des Taktventils (44) ist und daß die Frequenz der Pulsweitenmodulation des Taktventils (44) vorzugsweise synchron zur Drehzahl oder zu einem Vielfachen der Drehzahl der Hochdruckpumpe (14) eingestellt wird.Fuel injection device for an internal combustion engine with a high-pressure pump (14), through which fuel is conveyed into a memory (16), to which injectors (20) arranged on cylinders of the internal combustion engine are connected, with a feed pump (12), through which fuel from a fuel reservoir (10) is conveyed to the suction side of the high pressure pump (14), and with a fuel metering device (44) controlled by a control device (23), which is arranged between the pressure side of the feed pump (12) and the suction side of the high pressure pump (14) and by which the amount of fuel supplied to the suction side of the high-pressure pump (14) is set, characterized in that the fuel metering device is formed by a timing valve (44) which is opened and closed in a pulse-width-modulated manner by the control device (23), the one on the suction side of the high-pressure pump (14) amount of fuel supplied proportional to the opening time of the Taktve ntils (44) and that the frequency of the pulse width modulation of the clock valve (44) is preferably set synchronously with the speed or to a multiple of the speed of the high pressure pump (14). Kraftstoffeinspritzeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei geschlossenem Taktventil (44) die Saugseite der Hochdruckpumpe (14) vollständig von der Druckseite der Förderpumpe (12) getrennt ist.Fuel injection device according to Claim 1, characterized in that when the clock valve (44) is closed, the suction side of the high-pressure pump (14) is completely separated from the pressure side of the feed pump (12). Kraftstoffeinspritzeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß von der Verbindung (13) der Druckseite der Förderpumpe (12) mit der Saugseite der Hochdruckpumpe (14) stromaufwärts vor dem Taktventil (44) eine Bypassverbindung (48) zu einem Entlastungsbereich abführt, in der ein zum Entlastungsbereich hin öffnendes Druckventil (50) angeordnet ist.Fuel injection device according to Claim 1 or 2, characterized in that a bypass connection (48) leads from the connection (13) on the pressure side of the feed pump (12) to the suction side of the high pressure pump (14) upstream of the clock valve (44) to a relief area, in which is arranged a pressure valve (50) opening towards the relief area. Kraftstoffeinspritzeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß von der Verbindung (13) der Druckseite der Förderpumpe (12) mit der Saugseite der Hochdruckpumpe (14) stromaufwärts vor dem Taktventil (44) eine Schmierverbindung (58) zu einem Antrieb (32) der Hochdruckpumpe (14) abführt, in der vorzugsweise ein zum Antrieb (32) hin öffnendes Druckventil (60) und vorzugsweise eine Drosselstelle (62) angeordnet ist.Fuel injection device according to one of Claims 1 to 3, characterized in that a lubrication connection (58) to a drive (58) from the connection (13) on the pressure side of the feed pump (12) to the suction side of the high pressure pump (14) upstream of the clock valve (44). 32) of the high pressure pump (14), in which a pressure valve (60) opening towards the drive (32) and preferably a throttle point (62) is preferably arranged. Kraftstoffeinspritzeinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß von der Verbindung (13) der Druckseite der Förderpumpe (12) mit der Saugseite der Hochdruckpumpe (14) stromaufwärts vor dem Taktventil (44) eine ständig geöffnete Verbindung (52) zu einem Entlastungsbereich abführt, in der eine Drosselstelle (56) angeordnet ist.Fuel injection device according to one of the preceding claims, characterized in that from the connection (13) on the pressure side of the feed pump (12) to the suction side of the high-pressure pump (14) upstream in front of the clock valve (44), a constantly open connection (52) leads to a relief area , in which a throttle point (56) is arranged. Kraftstoffeinspritzeinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Hochdruckpumpe (14) wenigstens ein Pumpenelement (30) mit einem in einer Hubbewegung angetriebenen Pumpenkolben (34) aufweist, der einen Pumpenarbeitsraum (36) begrenzt, wobei der Pumpenkolben (34) abwechselnd einen Saughub, während dem Kraftstoff in den Pumpenarbeitsraum (36) angesaugt wird, und einen Förderhub ausführt, während dem Kraftstoff aus dem Pumpenarbeitsraum (36) in den Speicher (16) gefördert wird, und daß das Taktventil (44) durch die Steuereinrichtung (23) während des jeweiligen Saughubs des Pumpenkolbens (34) angesteuert wird.Fuel injection device according to one of the preceding claims, characterized in that the high-pressure pump (14) has at least one pump element (30) with a pump piston (34) which is driven in a stroke movement and which delimits a pump working space (36), the pump piston (34) alternatingly one Suction stroke while the fuel is sucked into the pump work space (36) and executes a delivery stroke while the fuel is conveyed from the pump work space (36) into the accumulator (16), and that the timing valve (44) is controlled by the control device (23) is controlled during the respective suction stroke of the pump piston (34). Kraftstoffeinspritzeinrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Hochdruckpumpe (14) mehrere Pumpenelemente (30) aufweist, deren Pumpenkolben (34) zeitlich versetzt zueinander ihren jeweiligen Saughub und Förderhub ausführen und daß das Taktventil (44) durch die Steuereinrichtung (23) jeweils während des Saughubs des Pumpenkolbens (34) eines Pumpenelements (30) angesteuert wird.Fuel injection device according to Claim 6, characterized in that the high-pressure pump (14) has a plurality of pump elements (30), the pump pistons (34) of which execute their respective suction and delivery strokes at different times from one another, and in that the timing valve (44) is controlled by the control device (23) each time of the suction stroke of the pump piston (34) of a pump element (30).
EP03004641A 2002-04-23 2003-03-03 Fuel injection system for internal combustion engine Withdrawn EP1357285A3 (en)

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DE10218021A DE10218021A1 (en) 2002-04-23 2002-04-23 Fuel injection device for an internal combustion engine

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741912A3 (en) * 2005-07-05 2007-06-27 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Method and device for controlling a fuel injection system for an internal combustion engine of a vehicle
WO2007107411A2 (en) * 2006-03-22 2007-09-27 Robert Bosch Gmbh High-pressure fuel pump and fuel injection system for an internal combustion engine
EP2037117A1 (en) * 2007-09-11 2009-03-18 C.R.F. Società Consortile per Azioni Fuel injection system comprising a variable flow rate high-pressure pump
EP2037111A1 (en) * 2007-09-13 2009-03-18 Magneti Marelli Powertrain S.p.A. Control method for a direct injection system of the Common-Rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump
ITMI20091138A1 (en) * 2009-06-26 2010-12-27 Bosch Gmbh Robert FUEL SUPPLY SYSTEM TO AN INTERNAL COMBUSTION ENGINE
WO2015007446A1 (en) * 2013-07-18 2015-01-22 Continental Automotive Gmbh Method for operating a fuel injection system of an internal combustion engine

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239429A1 (en) * 2002-08-28 2004-03-11 Robert Bosch Gmbh Fuel injection device for an internal combustion engine
DE10343480A1 (en) * 2003-09-19 2005-04-14 Robert Bosch Gmbh Fuel injection device for a combustion engine has high pressure pump store and small transfer pump with fuel only being sucked from return line if mixture is weak
DE102004045738B4 (en) * 2004-09-21 2013-05-29 Continental Automotive Gmbh Method and device for controlling an internal combustion engine
ES2280931T3 (en) * 2004-11-12 2007-09-16 C.R.F. Societa' Consortile Per Azioni HIGH PRESSURE PUMP WITH A FLOW REGULATION DEVICE FOR A FUEL INJECTION SYSTEM.
DE102004059330A1 (en) * 2004-12-09 2006-06-14 Robert Bosch Gmbh Method for operating a fuel system of an internal combustion engine
ATE356930T1 (en) * 2004-12-23 2007-04-15 Fiat Ricerche STORAGE INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
ATE491885T1 (en) * 2004-12-23 2011-01-15 Fiat Ricerche FUEL INJECTION DEVICE WITH VARIABLE FLOW HIGH PRESSURE FUEL PUMP
JP4000159B2 (en) * 2005-10-07 2007-10-31 三菱電機株式会社 High pressure fuel pump control device for engine
EP1865193B1 (en) * 2006-06-09 2010-11-03 C.R.F. Società Consortile per Azioni Fuel injection system for an internal combustion engine
DE102007000855B4 (en) * 2006-12-27 2020-06-10 Denso Corporation Fuel delivery device and storage fuel injection system having this
DE602007009109D1 (en) * 2007-09-21 2010-10-21 Magneti Marelli Spa Control method for a common-rail injection system with a shut-off valve for controlling the flow of a high-pressure fuel pump
DE102009031527B3 (en) * 2009-07-02 2010-11-18 Mtu Friedrichshafen Gmbh Method for controlling and regulating an internal combustion engine
DE102009028023A1 (en) * 2009-07-27 2011-02-03 Robert Bosch Gmbh High pressure injection system with fuel cooling from low pressure range
US9753443B2 (en) 2014-04-21 2017-09-05 Synerject Llc Solenoid systems and methods for detecting length of travel
US9997287B2 (en) 2014-06-06 2018-06-12 Synerject Llc Electromagnetic solenoids having controlled reluctance
CN107076127B (en) 2014-06-09 2019-11-12 新尼杰特公司 Method and apparatus for cooling down the solenoid coil of solenoid pump
CN106640449B (en) * 2016-12-27 2018-05-29 清华大学 For the self-priming electronic control low-pressure fuel gauge of internal combustion engine
JP6988352B2 (en) 2017-10-11 2022-01-05 株式会社デンソー Fuel pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853103A1 (en) 1998-11-18 2000-05-25 Bosch Gmbh Robert Fuel injection system for internal combustion engines

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643155A (en) * 1984-10-05 1987-02-17 Olin Corporation Variable stroke, electronically controlled fuel injection control system
CH674243A5 (en) * 1987-07-08 1990-05-15 Dereco Dieselmotoren Forschung
CH689281A5 (en) * 1994-02-03 1999-01-29 Christian Dipl-Ing Eth Mathis Fuel injection system for an internal combustion engine, especially for a diesel engine, and a method for monitoring the same.
DE19549108A1 (en) * 1995-12-29 1997-07-03 Bosch Gmbh Robert High-pressure fuel generation system for a fuel injection system used in internal combustion engines
DE19618707C2 (en) * 1996-05-09 1998-12-17 Siemens Ag Method and device for regulating a fuel volume flow
DE19625698B4 (en) * 1996-06-27 2005-09-22 Robert Bosch Gmbh Injection device for the combined injection of fuel and additional fluid
DE19727785B4 (en) * 1997-06-30 2006-04-13 Robert Bosch Gmbh Flow control valve for controlling liquids
DE19810867C2 (en) * 1998-03-13 2000-02-24 Bosch Gmbh Robert Fuel pump arrangement
EP0964150B1 (en) * 1998-04-15 2005-06-15 Denso Corporation Fuel injection system for internal combustion engine
DE19834120A1 (en) * 1998-07-29 2000-02-03 Bosch Gmbh Robert Fuel supply system of an internal combustion engine
JP4206563B2 (en) * 1999-06-18 2009-01-14 株式会社デンソー Fuel injection device
DE19956093B4 (en) * 1999-11-22 2005-03-31 Siemens Ag Fuel delivery device for a common rail injection system
JP4841772B2 (en) * 2001-09-28 2011-12-21 いすゞ自動車株式会社 Common rail fuel injection control device
EP1321663A3 (en) * 2001-12-19 2003-07-02 Robert Bosch Gmbh Fuel injection device for an internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853103A1 (en) 1998-11-18 2000-05-25 Bosch Gmbh Robert Fuel injection system for internal combustion engines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741912A3 (en) * 2005-07-05 2007-06-27 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Method and device for controlling a fuel injection system for an internal combustion engine of a vehicle
US7422002B2 (en) 2005-07-05 2008-09-09 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Method and apparatus for controlling a fuel injection system for an internal combustion engine in a vehicle
WO2007107411A2 (en) * 2006-03-22 2007-09-27 Robert Bosch Gmbh High-pressure fuel pump and fuel injection system for an internal combustion engine
WO2007107411A3 (en) * 2006-03-22 2007-11-08 Bosch Gmbh Robert High-pressure fuel pump and fuel injection system for an internal combustion engine
EP2037117A1 (en) * 2007-09-11 2009-03-18 C.R.F. Società Consortile per Azioni Fuel injection system comprising a variable flow rate high-pressure pump
KR100955391B1 (en) * 2007-09-11 2010-05-03 씨.알.에프. 쏘시에타 컨서틸 퍼 아지오니 Fuel injection system comprising a variable flow rate high-pressure pump
US7779815B2 (en) 2007-09-11 2010-08-24 C.R.F. Societa Consortile Per Azioni Fuel injection system comprising a variable flow rate high-pressure pump
EP2037111A1 (en) * 2007-09-13 2009-03-18 Magneti Marelli Powertrain S.p.A. Control method for a direct injection system of the Common-Rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump
US7699040B2 (en) 2007-09-13 2010-04-20 Magneti Marelli Powertrain S.P.A. Control method for a direct injection system of the common-rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump
ITMI20091138A1 (en) * 2009-06-26 2010-12-27 Bosch Gmbh Robert FUEL SUPPLY SYSTEM TO AN INTERNAL COMBUSTION ENGINE
WO2015007446A1 (en) * 2013-07-18 2015-01-22 Continental Automotive Gmbh Method for operating a fuel injection system of an internal combustion engine
US9739209B2 (en) 2013-07-18 2017-08-22 Continental Automotive Gmbh Method for operating a fuel injection system of an internal combustion engine

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DE10218021A1 (en) 2003-11-06
EP1357285A3 (en) 2004-09-22
US20040016830A1 (en) 2004-01-29
US6976473B2 (en) 2005-12-20
JP2003314394A (en) 2003-11-06

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