EP2032832A1 - Dispositif d'injection de carburant pour un moteur à combustion interne - Google Patents

Dispositif d'injection de carburant pour un moteur à combustion interne

Info

Publication number
EP2032832A1
EP2032832A1 EP07728522A EP07728522A EP2032832A1 EP 2032832 A1 EP2032832 A1 EP 2032832A1 EP 07728522 A EP07728522 A EP 07728522A EP 07728522 A EP07728522 A EP 07728522A EP 2032832 A1 EP2032832 A1 EP 2032832A1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
forderpumpe
low
fuel injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07728522A
Other languages
German (de)
English (en)
Other versions
EP2032832B1 (fr
Inventor
Stefan Kieferle
Dorothee Sommer
Oliver Becker
Bjoern Noack
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 EP2032832A1 publication Critical patent/EP2032832A1/fr
Application granted granted Critical
Publication of EP2032832B1 publication Critical patent/EP2032832B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators

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 103 43 482 Al.
  • This fuel injection device has a Forderpumpe with an electric drive, is required by the fuel from a Kraftstoffvorratsbehalter to the suction side of a high-pressure pump.
  • the high-pressure pump fuel is required in a high pressure area, wherein in the high pressure area at least one of the
  • the fuel injection device also has an electronic control device, by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine.
  • the fuel injection device also has an electronic control device, by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine.
  • an electronic control device by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine.
  • Between the Forderpumpe and the suction side of the high-pressure pump KraftstoffZumess adopted is provided, through which the fuel supply to the suction side of the high-pressure pump and thus the required by the high-pressure pump in the high-pressure region amount of fuel can be varied and is controlled by the electronic control device.
  • a pressure sensor is arranged, by which the pressure in the high-pressure region is detected and which is connected to the electronic control device, wherein by the control device
  • Fuel metering device is driven such that the high-pressure pump requires such an amount of fuel in the high pressure area, which is required to maintain a predetermined pressure in the high pressure region.
  • the Forderpumpe is operated at a substantially constant speed, so that by this a substantially constant amount of fuel is required, which must be such that the maximum fuel demand of the engine is provided. This means that the Fordermenge the Forderpumpe is in most operating conditions of the internal combustion engine outside the full load too large.
  • the excess Fordermenge the Forderpumpe is characterized by a between the Forderpumpe and the
  • the fuel injection device with the features according to claim 1 has the advantage that the Forderpumpe is operated dependent demand, whereby these can be designed in their dimensions for a lower average continuous load and the electrical power consumption for the drive over all operating conditions of the internal combustion engine averaged much lower ,
  • the operation of the Forderpumpe can be optimized for example to improve the operating conditions of the high-pressure pump.
  • the embodiment according to claim 4 has the advantage that a possible pressure drop in the passage through the fuel filter has no influence on the pressure detection in the low-pressure region.
  • the embodiment according to claims 7 and 8 has the advantage that the lubrication and / or cooling of the drive region of the high-pressure pump is improved under high load.
  • the embodiment according to claim 9 has the advantage that the lubrication and / or cooling of the drive region of the high-pressure pump at high
  • the embodiment according to claim 10 and 11 has the advantage that required by the Forderpumpe fuel, which is not sucked by the high pressure pump, can be removed from the low pressure region.
  • the embodiment according to claim 12 has the advantage that the total amount of fuel demanded by the forwarder pump is available for lubrication and / or cooling of the drive region of the high-pressure pump.
  • FIG. 1 shows a fuel injection device for an internal combustion engine in a schematic representation according to a first
  • FIG. 2 shows a diagram in which the Fordermenge a Forderpumpe and the Uberstrommenge an overflow valve is applied over the pressure prevailing in a low pressure region
  • Figure 3 shows the fuel injection device in a schematic representation according to a second exemplary embodiment. Description of the exemplary embodiments
  • Fuel injection device for an internal combustion engine for example, a motor vehicle shown.
  • the fuel injection device has a Forderpumpe 10, is sucked through the fuel from a Kraftstoffvorratsbehalter 12.
  • the Forderpumpe 10 has an electric drive 14 in the form of an electric motor and the Forderpumpe 10 may be arranged outside or as shown in Figures 1 and 3 within the Kraftstoffvorratsbehalters 12.
  • a jam or swirl pot 16 may be arranged, from which the Forderpumpe 10 sucks and is ensured by the fact that the Forderpumpe 10 even at low level in the
  • Fuel storage tank 12 can suck fuel.
  • fuel is required for example by at least one jet pump 18.
  • fuel is required to the suction side of a high-pressure pump 20 of the fuel injection device is required.
  • a fuel filter 22 is provided, through which the fuel required by the Forderpumpe 10 is cleaned before it flows to the high-pressure pump 20.
  • the high-pressure pump 20 has one or more pump elements 24, which in turn each have a guided in a cylinder bore 26 pump piston 28. By the respective pump piston 28 is in the respective
  • Cylinder bore 26 a pump working space 30 limited.
  • the respective pump pistons 28 is at least indirectly driven in a reciprocating motion by a drive shaft 32 driven in rotation by the internal combustion engine.
  • the drive shaft 32 is rotatably supported, for example, via two bearing points of a housing 34 of the high-pressure pump 14 which are spaced apart from one another in the direction of the axis of rotation of the drive shaft 32.
  • the bearings can be arranged in different parts of the Pumpengehauses 34, for example, a first bearing in a Grundkorper the Pumpengehauses 34 and a second
  • the drive shaft 32 In a region lying between the two bearing points, the drive shaft 32 has at least one cam 36 or an eccentric to its axis of rotation formed portion, wherein the cam 36 may be formed as a multiple cam.
  • the drive shaft 32 of the high-pressure pump 20 is driven by the internal combustion engine, for example, by the crankshaft or camshaft.
  • the coupling of the drive shaft 32 with the internal combustion engine can be done for example via a belt (timing belt), a chain or gears. Due to the drive of the high-pressure pump 20 by the internal combustion engine, the rotational speed of the drive shaft 32 of the high-pressure pump 20 is proportional to the rotational speed of the internal combustion engine.
  • the respective pump piston 28 can be supported directly or via a plunger 29 on the cam 36 or eccentric of the drive shaft 32.
  • Each pumping element 24 has an inlet valve 38 which opens into the pump working space 30 and through which the pump working space 30 is filled with fuel when the suction stroke of the pump piston 28 directed radially inwards towards the drive shaft 32 is filled with fuel.
  • Each pump element 24 also has an outlet valve 40 which opens out of the pump working chamber 30 and over which the Forderhub of the radially outward Forderhub Pump piston 28 compressed fuel from the pump chamber 30 is displaced.
  • the inlet valve 38 and the outlet valve 40 are each designed as spring-loaded check valves.
  • the drive shaft 32 with the cam 36 or eccentric and the Abstutzung the at least one pump piston 28 forms a arranged in the interior of the Pumpengehauses 34 drive portion 37 of the high-pressure pump 20th
  • the high-pressure pump 14 is at least one
  • a memory 42 At least one arranged on a cylinder of the internal combustion engine injector 44 is connected, is injected through the fuel into the combustion chamber of the cylinder.
  • the injectors 44 are connected directly or indirectly via hydraulic lines to the high pressure pump 14, wherein the separate memory 42 can be omitted.
  • the injector 44 has a fuel injection valve and, for example, an electrically actuated control valve, by which the opening and closing function of
  • Fuel injection valve is controlled. It can also be provided that the fuel injection valve is controlled directly by an electric actuator, for example a piezoelectric actuator.
  • the fuel injector also includes an electronic controller 46 that controls fuel injection.
  • Control device 46 the injector 44 is driven so that a predetermined amount of fuel is injected through this at a given time.
  • a pressure sensor 48 is arranged, by means of which the pressure in the high-pressure region is detected and which is connected to the control device 46. From the memory 42 For example, a connection to a relief region, for example a return to the fuel storage container 12, can be discharged, which is controlled by a pressure limiting or pressure regulating valve 43.
  • a fuel metering device 50 is provided between the feed pump 10 and the suction side of the high-pressure pump 20, which is preferably arranged between the fuel filter 22 and the suction side of the high-pressure pump 20.
  • the area between the Forderpumpe 10 and the suction side of the high pressure pump 20 is referred to below as a low pressure area.
  • the fuel metering device 50 may be designed such that a flow cross-section of different size in the connection between the Forderpumpe 10 and the suction side of the high-pressure pump 20 is adjusted by these continuously or stepwise.
  • the fuel metering device 50 may also be formed by a clocked valve which is opened and closed at a specific frequency, this releasing a certain averaged flow area in accordance with its opening duration.
  • the fuel metering device 50 may include an electric actuator 51, which may be, for example, an electromagnet or a piezoactuator, and which is controlled by the control device 46.
  • the fuel metering device 50 may also be hydraulically controlled.
  • the flow cross section is determined by a piston which is acted upon by a hydraulic pressure movable. The hydraulic pressure can be generated, for example, by the passage of the pressure control valve 43.
  • the Pressure control valve 43 can be controlled by the control device 46, so that the fuel metering device 50 is controlled indirectly via the Abêtmenge of the pressure control valve 43 by the control device 46.
  • the fuel injection device further comprises a between the Forderpumpe 10 and the
  • Kraftstoffumuminiques 50 arranged overflow valve 52, by which a connection of the low-pressure region is controlled with a discharge area.
  • Relief area is, for example, a return 53 to Kraftstoffvorratsbehalter 12, wherein in the discharge area, a lower pressure prevails than in the low pressure area.
  • the overflow valve 52 is designed as a pressure valve, which opens upon reaching a predetermined pressure in the low pressure region and let fuel flow out of the low pressure region in the discharge area.
  • the opening pressure of the overflow valve 52 is determined by a spring 54, which acts on a valve member 55 of the spill valve 52 in a closing direction.
  • the spill valve 52 is disposed downstream of the drive section 37 between it and the fuel meter 50.
  • connection upstream of the fuel metering device 50 dissipates a connection in the drive range of the high-pressure pump 20.
  • the part of the amount of fuel required by the feed pump 10 is available for the lubrication of the drive region of the high pressure pump 20, which is not supplied to the suction side of the high pressure pump 20 by the fuel metering device 50.
  • the pressure prevailing in the low-pressure region between the fuel filter 22 and the suction side of the high-pressure pump 20 is detected by a pressure sensor 56, which is connected to the control device 46.
  • the pressure sensor 56 is arranged in the low-pressure region between the fuel filter 22 and the drive region of the high-pressure pump 20, so that a possible
  • Pressure drop is considered in the flow through the fuel filter 22 in the pressure detection in the low pressure range.
  • the high-pressure pump 20 As an operating parameter in particular the Fordermenge the high-pressure pump 20 is taken into account, which corresponds to the load of the internal combustion engine.
  • the high pressure pump 20 may be to maintain a predetermined pressure in the memory 42, as more fuel is removed through the injectors 44 from the memory 42 and injected into the internal combustion engine.
  • the speed of the internal combustion engine which is proportional to the speed of the High pressure pump 20 is to be considered.
  • the fuel temperature can be taken into account by means of a
  • Fuel temperature sensor 58 is detected, which is connected to the control device 46.
  • the drive 14 of the Forderpumpe 10 is driven such that required by the Forderpumpe 10 in the low pressure range at high load, and thus large Fordermenge the high pressure pump 20, and / or high speed of the engine and the high pressure pump 20, a larger amount of fuel and so that a higher pressure is generated than at low load and Fordermenge and / or low speed. It can be provided that with increasing load of
  • the high-pressure pump 20 Internal combustion engine and thus increasing Fordermenge the high-pressure pump 20 is controlled by the controller 46 of the electric drive 14 of the Forderpumpe 10 such that demanded by the Forderpumpe 10 an increasingly larger amount of fuel and thus an increasingly higher pressure in the low pressure region is generated.
  • the demanded by the Forderpumpe 10 amount of fuel that is not sucked by the high pressure pump 20 and required in the memory 42 is controlled by the spill valve 52 in the discharge area 53. It may be provided that the amount of fuel required by the Forderpumpe 10 is increased by the control device 46 disproportionate to the fuel quantity to be demanded by the high-pressure pump 20 in order to ensure adequate lubrication and / or cooling
  • Fuel temperature required by the Forderpumpe 10 a larger amount of fuel and thus a higher pressure in the low pressure region is generated than at low fuel temperature. It may be provided that with increasing fuel temperature of the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that required by the Forderpumpe 10 an increasing amount of fuel in the low pressure region and thus a higher pressure in the low pressure region is generated. As a result, a sufficient lubrication and / or cooling of the drive portion 37 of the high-pressure pump 20 is also ensured, since with increasing
  • Fuel temperature, the lubricating effect of the fuel is worse.
  • setpoint values for the pressure in the low-pressure region are stored in the control device 46 in a characteristic diagram, in which case the electrical drive 14 of the Forderpumpe 10 is controlled by the control device 46 such that the Forderpumpe 10 such a fuel quantity is required in the low-pressure region, like this to
  • the characteristic of the overflow valve 52 is determined so that an increasing amount of fuel is diverted into the discharge area by this with increasing pressure in the low pressure region.
  • the overflow valve 52 may, for example, have an at least approximately linear characteristic, so that, proportional to the pressure in the low-pressure region, the amount of fuel diverted by the overflow valve 52 increases.
  • FIG. 2 shows a diagram in which, by way of example, the region A is shown, in which the volume required by the delivery pump 10 Fuel quantity V is plotted against the pressure prevailing in the low pressure range pND.
  • the characteristic curve of the overflow valve 52 is shown by way of example in the diagram according to FIG. 2 with B.
  • the spill valve 52 is designed such that regardless of the setting of the
  • KraftstoffZumess Road 50 required by the Forderpumpe 10 fuel from the low pressure range can be controlled.
  • the spill valve 52 thus a variable adjustment of the pressure in the low pressure region and thus the Fordermenge the Forderpumpe 10 is made possible regardless of the demand of the high-pressure pump 20 fuel quantity.
  • the lubrication and / or cooling of the drive range of the high-pressure pump 20 can be improved as required, independently of the fuel quantity to be demanded by the high-pressure pump 20.
  • Fuel temperature, the pressure generated by the Forderpumpe 10 in the low pressure range can be kept low, what the Forderpumpe 10 requires only a small amount of fuel needs, whereby the burden of Forderpumpe 10, in particular of the electric drive 14, and thus the need for electrical energy its supply can be kept low.
  • the Forderpumpe 10 with the electric drive 14 can therefore be designed for a lower average load, wherein the Design compared to a design with a constant Fordermenge can be simplified or compared to this design an increased life can be achieved. Alternatively, even without restrictions in the life of the Forderpumpe 10 increased
  • the load of the fuel filter 22 is reduced in the variable Fordermenge the Forderpumpe 10, since it is not constantly flowed through by the maximum Fordermenge the Forderpumpe 10 but only from the actual required Fordermenge the Forderpumpe 10.
  • the fuel filter 22 can therefore compared to a conventional design for constant Fordermenge the Forderpumpe 10 are smaller or can achieve a longer life with the same dimensions.
  • the fuel injection device is shown according to a second exemplary embodiment, in which compared to the first exemplary embodiment, the fuel metering device and optionally the spill valve can be omitted.
  • the Forderpumpe 10 has the electric drive 14, by the
  • Control device 46 is driven. Between the Forderpumpe 10 and the suction side of the high pressure pump 20, the fuel filter 22 is arranged and in the low pressure region between the fuel filter 22 and the suction side of the high-pressure pump 20, the pressure sensor 56 is arranged, which is connected to the control device 46, wherein the pressure detected by the pressure sensor 56 in the low-pressure region serves as a controlled variable for the control device 46 in the control of the drive 14 of the Forderpumpe 10.
  • the pressure sensor 48 can be arranged in the high-pressure region, by which the pressure in the high-pressure region is detected and which is connected to the control device 46. In the high pressure area, the pressure regulating or pressure limiting valve 43 can also be provided. Between the Forderpumpe 10 and the fuel filter 22, a pressure limiting valve 60 is arranged to prevent damage to the Forderpumpe 10 and / or the fuel filter 22 at too high pressure.
  • fuel injection device required by the Forderpumpe 10 amount of fuel for variable adjustment of the sucked by the high pressure pump 20 and required in the high pressure area fuel quantity can be variably adjusted.
  • the pressure generated by the Forderpumpe 10 in the low pressure region can be kept substantially constant within predetermined limits.
  • the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that the Forderpumpe 10 such a large Fordermenge to the suction side of the high-pressure pump 20 is required and by the
  • High pressure pump 20 is required in the memory 42, which is required to maintain a predetermined pressure in the memory 42.
  • an increasing amount of fuel in the memory 42 and accordingly by the Forderpumpe 10 an increasing amount of fuel to the suction side of the high-pressure pump 20 are required to maintain the predetermined pressure in the low pressure range.
  • the fuel metering device 50 can be omitted.
  • an operating parameter of the internal combustion engine and the high-pressure pump 20 may preferably be taken into account by the control device 46 and a pilot control of the pressure in the low pressure region carried out such that with increasing speed through the
  • Forderpumpe 10 requires a larger amount of fuel and a higher pressure in the low pressure range is generated. In particular, when idling the internal combustion engine, the demanded by the Froderpumpe 10 amount of fuel and thus the pressure in the low pressure region can be kept low, whereby the required drive power for the Forderpumpe 10 is kept low.
  • the high-pressure pump 20 may be provided as in the first exemplary embodiment, the fuel metering device 50.
  • At least a portion of the amount of fuel required by the Forderpumpe 10 in the low pressure range is supplied to the drive portion 37 of the high-pressure pump 20 for lubrication and / or cooling.
  • the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that by the Forderpumpe 10 always a minimum amount of fuel is required, which is necessary to ensure adequate lubrication and / or cooling of the drive portion 37 of the high-pressure pump 20.
  • monitoring of the low-pressure region for leakage can also be realized since a leak can be concluded from a rapid pressure drop in the low-pressure region.
  • variable leakage at the high pressure pump due to wear only slow pressure drops in the low pressure region occur, so that here a clear distinction is possible. If a leakage is detected by the control device 46, so for example, the further operation of the internal combustion engine can be prevented or a warning to be given to the vehicle driver.
EP07728522A 2006-06-14 2007-04-25 Dispositif d'injection de carburant pour un moteur à combustion interne Active EP2032832B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006027486A DE102006027486A1 (de) 2006-06-14 2006-06-14 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
PCT/EP2007/054067 WO2007144227A1 (fr) 2006-06-14 2007-04-25 Dispositif d'injection de carburant pour un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2032832A1 true EP2032832A1 (fr) 2009-03-11
EP2032832B1 EP2032832B1 (fr) 2010-12-15

Family

ID=38282879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728522A Active EP2032832B1 (fr) 2006-06-14 2007-04-25 Dispositif d'injection de carburant pour un moteur à combustion interne

Country Status (7)

Country Link
US (1) US8205596B2 (fr)
EP (1) EP2032832B1 (fr)
JP (1) JP4909406B2 (fr)
KR (1) KR101087430B1 (fr)
AT (1) ATE491879T1 (fr)
DE (2) DE102006027486A1 (fr)
WO (1) WO2007144227A1 (fr)

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ATE491879T1 (de) 2011-01-15
KR101087430B1 (ko) 2011-11-25
DE102006027486A1 (de) 2007-12-20
EP2032832B1 (fr) 2010-12-15
US20100012096A1 (en) 2010-01-21
JP2009540205A (ja) 2009-11-19
KR20090007644A (ko) 2009-01-19
WO2007144227A1 (fr) 2007-12-21
US8205596B2 (en) 2012-06-26
JP4909406B2 (ja) 2012-04-04
DE502007005964D1 (de) 2011-01-27

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