EP1798409A2 - Système d'injection de carburant pour un moteur à combustion - Google Patents

Système d'injection de carburant pour un moteur à combustion Download PDF

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Publication number
EP1798409A2
EP1798409A2 EP06125839A EP06125839A EP1798409A2 EP 1798409 A2 EP1798409 A2 EP 1798409A2 EP 06125839 A EP06125839 A EP 06125839A EP 06125839 A EP06125839 A EP 06125839A EP 1798409 A2 EP1798409 A2 EP 1798409A2
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
control valve
injector
pump
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Withdrawn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
EP06125839A
Other languages
German (de)
English (en)
Other versions
EP1798409A3 (fr
Inventor
Uwe Nigrin
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
Continental Automotive 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 Siemens AG, Continental Automotive GmbH filed Critical Siemens AG
Publication of EP1798409A2 publication Critical patent/EP1798409A2/fr
Publication of EP1798409A3 publication Critical patent/EP1798409A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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 relates to an injection system for an internal combustion engine and an injector for an injection system of an internal combustion engine.
  • injection systems are used, which are increasingly designed in recent years as so-called "common rail" - systems.
  • the injectors arranged in the combustion chambers are supplied with fuel from a common fuel reservoir, the common rail.
  • the fuel to be injected is present in the fuel tank under a pressure of up to 2000 bar.
  • an injection system for an internal combustion engine is known, with a prefeed pump, with the fuel from a fuel tank to the suction side of a high pressure pump can be promoted.
  • One of the prefeed pump hydraulically downstream high pressure pump then delivers fuel into a fuel storage, from where it can then be distributed to the hydraulically coupled to the fuel injectors.
  • a control valve is arranged, through which a fuel flow from the fuel tank can be adjusted to the prefeed pump. With suitable control of the control valve can be achieved in the fuel tank a predetermined, dependent on the operating parameters of the engine pressure.
  • the invention has for its object to provide an injection system of the type described above, with a simple way, a precise and reliable metering of fuel for the internal combustion engine and a simple structure of the injection system are possible. Furthermore, the invention has for its object to provide an injector for an injection system of an internal combustion engine, which is easy to assemble.
  • the invention is characterized by an injection system for an internal combustion engine, with a prefeed pump for delivering fuel from a fuel tank, a downstream of the feed pump high-pressure pump for pumping the fuel into a fuel reservoir, a high-pressure pump downstream downstream pressure control valve with the the pressure to be established in the fuel accumulator is adjustable, and at least one injector arranged downstream of the fuel accumulator.
  • the pressure control valve is disposed hydraulically in parallel with the injector downstream of the fuel reservoir.
  • the pressure control valve and the injector are designed as a structural unit.
  • a plurality of injectors are arranged hydraulically in parallel downstream of the fuel reservoir, and downstream of the fuel reservoir, a pressure control valve is arranged hydraulically parallel to each injector. If a pressure control valve is assigned to each of the injectors, individual pressurization of each of the injectors is possible.
  • the invention comprises an injector for an injection system of an internal combustion engine with a pressure control valve, wherein the pressure control valve is arranged hydraulically parallel to the injector, and the injector and the pressure control valve are formed as a structural unit.
  • the pressure control valve is arranged hydraulically parallel to the injector, and the injector and the pressure control valve are formed as a structural unit.
  • FIG. 1 shows an injection system for an internal combustion engine, which has a fuel tank 10. From the fuel tank 10 12 fuel is conveyed by means of a prefeed pump.
  • the feed pump 12 may be mechanically driven by a drive shaft, not shown, wherein the drive shaft may be fixedly coupled to a motor shaft of the internal combustion engine.
  • the prefeed pump 12 is hydraulically coupled on the pressure side with a pre-pressure control valve 28, so that when a predetermined fuel pressure at the pressure side of the prefeed pump 12 is exceeded, part of the fuel delivered by the prefeed pump 12 can be returned to the suction side of the prefeed pump 12. As a result, the fuel pressure at the pressure side of the prefeed pump 12 can be limited.
  • a high-pressure pump 14 Downstream of the pre-feed pump 12, a high-pressure pump 14, which promotes fuel into a fuel reservoir 16 via a fuel storage feed line 44.
  • the high pressure pump 14 may preferably be formed as a radial piston pump or as a series piston pump with a plurality of cylinder units, as is known for use in injection systems of internal combustion engines.
  • the fuel accumulator 16 is coupled via lines to an injector 18 or a plurality of injectors 18.
  • Each of the injectors 18 is associated with a combustion chamber of the internal combustion engine and each injector 18 can be controlled so that fuel is injected into the associated combustion chamber.
  • the high pressure pump 14 the fuel to be injected by means of the injectors 18 in the combustion chambers of the internal combustion engine, a relatively high injection pressure.
  • Excess fuel may be returned to the fuel tank 10 from the injectors 18 via an injector return line 46.
  • a volume flow control valve 22 is arranged, which allows control of the fuel flow, the high-pressure pump 14 to be supplied.
  • the volume control valve 22 can be controlled as a function of the pressure required for the fuel accumulator 16 as well as in dependence on further input variables.
  • the injection system downstream of the fuel reservoir 16 hydraulically parallel to one of the injectors 18, a pressure control valve 20.
  • a pressure control valve 20 Under hydraulic parallel arrangement between one of the injectors 18 and the pressure control valve 20 is to be understood that the pressure control valve 20 and the injector 18 downstream of the fuel reservoir 16 and upstream of the pressure control valve 20 and the injector 18 and the other downstream of the pressure control valve 20 and the injector 18 and upstream of the fuel tank 10 are hydraulically coupled together.
  • the pressure control valve 20 and the injector 18 are formed as a structural unit 26.
  • the assembly 26 of pressure control valve 20 and injector 18 only two hydraulic connection points 27 a, 27 b, which are formed so that the assembly 26 of pressure control valve 20 and the injector 18 upstream of the fuel tank 16 and on the other in the injector return line 46 upstream the fuel tank 10 can be hydraulically connected.
  • the hydraulic coupling between pressure control valve 20 and injector 18 is therefore preferably carried out within the assembly 26 of pressure control valve 20 and injector 18th
  • a predetermined fuel pressure can be adjusted, and the injectors 18 from the fuel reservoir 16 each partial fuel streams of the supplied from the high pressure pump 14 to the fuel reservoir 16 funded fuel flow.
  • a purge line valve 32 and hydraulically in series thereto a purge line throttle 34 is further arranged.
  • the purge line throttle 34 may limit the flow of fuel through the purge line 29.
  • Hydraulically parallel to the purge line valve 32 and the purge line throttle 34 a vent throttle 30 is arranged. By means of the vent throttle 30, it is possible to return any air present in the lines via the purge line 29 and the purge return line 35 into the fuel tank 10.
  • the purge line valve 32 the branching off via the purge line 29 fuel flow can be released when the predetermined fuel pressure at the pressure side of the feed pump 12 is exceeded.
  • the differential pressure in the purge line valve 32 must be greater than the sum of the opening differential pressure of the inlet valves of the high-pressure pump 14 and the differential pressure of the intermediate line, so that the purge of the high-pressure pump 14 only starts when the operating pressure of the high pressure pump 14 is reached. This is necessary because only so can be made sure that does not fuel through the purge line 29 is branched off, as long as the pressure build-up of the suction side of the high pressure pump 14 is not completed. This can be achieved that the pressure build-up of the suction side of the high-pressure pump 14 is not delayed.
  • filters 36, 38 are arranged at suitable points.
  • a first filter 36 is provided to protect the prefeed pump 12 hydraulically between the fuel tank 10 and the prefeed pump 12.
  • a second filter 38 is arranged.
  • the purge return line 35 and the injector return line 46 from the injectors 18 are preferably returned to the fuel tank 10.
  • the pressure control valve 20 is disposed directly on the injector 18 and thus in a relatively large distance from the high pressure pump 14, a backflow of fuel into the high pressure pump 14 can be avoided.
  • the high-pressure pump 14 is exposed only to low loads by pressure and temperature. It is thus possible to achieve a high fatigue strength of the high-pressure pump 14 with respect to pressure and temperature.
  • the assembly 26 of pressure control valve 20 and injector 18 By constructing the assembly 26 of pressure control valve 20 and injector 18, it is possible to arrange the pressure control valve 20 and the injector 18 via a common hydraulic interface with the hydraulic ports 27a, 27b in the conduit located downstream of the fuel reservoir 16 and upstream of the fuel tank 10 Injector return line 46 to assemble. Furthermore, it is possible to equip the pressure control valve 20 and the injector 18 with a single electrical contact, for example, a single electrical connector. Thus, both material for the hydraulic and the electrical coupling can be saved. In addition, the assembly cost can be kept low. The assembly 26 of pressure control valve 20 and injector 18 may thus represent a cost effective solution.
  • the prefeed pump 12 delivers fuel from the fuel tank 10, with impurities in the first filter 36 between the fuel tank 10 and the feed pump 12 can be retained.
  • the pressure at the outlet of the feed pump 12 is adjusted by the admission pressure control valve 28.
  • the fuel then passes via the second filter 38 to the volume flow control valve 22.
  • the volume flow control valve 22 of the high pressure pump 14 is provided as much fuel available, as required by the fuel reservoir 16.
  • the fuel is supplied via the fuel storage supply line 44 to the fuel reservoir 16. From the fuel reservoir 16, the fuel reaches the injectors 18, from which it is injected into the combustion chambers of the internal combustion engine.
  • the fuel pressure required for the injection is set by the pressure control valve 20 downstream of the fuel reservoir 16 and hydraulically in parallel to one of the injectors 18.
  • the fuel reservoir 16 and thus all the injectors 18 can be acted upon by fuel of the same pressure. Excess fuel arising at the injectors 18 is returned via the return line 46 from the injectors 18 into the fuel tank 10.
  • each of a pressure control valve 20 in parallel to each injector 18 allows in injection systems in which the pressure ratios between the fuel reservoir 16 and the individual injectors 18 are each different, a predetermined pressurization for each of the injectors 18 to reach. If, for example, different aggregates are arranged hydraulically between the fuel accumulator 16 and the individual injectors 18, then the possibly occurring pressure losses between the fuel accumulator 16 and the individual injectors 18 can be adjusted to the respective pressure control valves parallel to an injector 18 by appropriate adjustments 20 are eliminated. On the other hand, in this embodiment, if desired, different pressure specifications for the individual injectors 18 can also be realized.
  • FIG. 3 shows a further embodiment of the injection system, which differs from the first embodiment in FIG. 1 in that no volume flow control valve is arranged between the pre-feed pump 12 and the high-pressure pump 14. Since, as already described in detail in the description of the first embodiment, by means of the arrangement of the pressure control valve 20 hydraulically parallel to the injector 18, a highly dynamic control or control of the pressure at the injector 18 is now possible in the case of a dynamic flow on the suction side of the high pressure pump 14, as may occur in the case of a direct fueling of the suction side of the high-pressure pump 14 by the feed pump 12 without the use of the volume flow control valve, the fuel pressure for the injectors 18 by rapid regulation or control of the pressure by the pressure control valve 20 quickly to pressure fluctuations on the injectors 18 will be responded. This makes it possible to achieve a small installation space volume for the injection system without restricting the controllability of the fuel pressure for the injectors 18 by eliminating the volume flow control valve. In addition, by eliminating the flow control valve a cost effective solution for the injection system
  • the pressure control valve 20 and the injector 18 are formed separately, thus optionally also form no assembly.
  • the pressure control valve 20 is arranged hydraulically parallel to the injector 18.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP06125839A 2005-12-14 2006-12-11 Système d'injection de carburant pour un moteur à combustion Withdrawn EP1798409A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510059830 DE102005059830B3 (de) 2005-12-14 2005-12-14 Einspritzanlage für eine Brennkraftmaschine

Publications (2)

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EP1798409A2 true EP1798409A2 (fr) 2007-06-20
EP1798409A3 EP1798409A3 (fr) 2007-12-12

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EP06125839A Withdrawn EP1798409A3 (fr) 2005-12-14 2006-12-11 Système d'injection de carburant pour un moteur à combustion

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DE (1) DE102005059830B3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209377B4 (de) * 2015-05-21 2017-05-11 Mtu Friedrichshafen Gmbh Einspritzsystem für eine Brennkraftmaschine sowie Brennkraftmaschine mit einem solchen Einspritzsystem

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1296060B1 (fr) 2001-09-22 2005-06-08 Robert Bosch Gmbh Système d'injection de carburant pour un moteur à combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19734354A1 (de) * 1997-08-08 1999-02-11 Mtu Friedrichshafen Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine
JP2001041128A (ja) * 1999-07-28 2001-02-13 Toyota Motor Corp 高圧燃料ポンプ
DE10218023A1 (de) * 2002-04-23 2003-11-06 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE102004005451A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffeinspritzsystem für Brennkraftmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1296060B1 (fr) 2001-09-22 2005-06-08 Robert Bosch Gmbh Système d'injection de carburant pour un moteur à combustion interne

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Publication number Publication date
DE102005059830B3 (de) 2007-05-03
EP1798409A3 (fr) 2007-12-12

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