EP2172642A1 - Système d'injection pour carburants diesel - Google Patents

Système d'injection pour carburants diesel Download PDF

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Publication number
EP2172642A1
EP2172642A1 EP09011631A EP09011631A EP2172642A1 EP 2172642 A1 EP2172642 A1 EP 2172642A1 EP 09011631 A EP09011631 A EP 09011631A EP 09011631 A EP09011631 A EP 09011631A EP 2172642 A1 EP2172642 A1 EP 2172642A1
Authority
EP
European Patent Office
Prior art keywords
rail
control
pressure
injection system
ecu
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.)
Ceased
Application number
EP09011631A
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German (de)
English (en)
Inventor
Erich Eder
Peter Prinz-Hufnagel
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.)
Motorenfabrik Hatz GmbH and Co KG
Original Assignee
Motorenfabrik Hatz GmbH and Co KG
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 Motorenfabrik Hatz GmbH and Co KG filed Critical Motorenfabrik Hatz GmbH and Co KG
Publication of EP2172642A1 publication Critical patent/EP2172642A1/fr
Ceased 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F02M63/027—More than one high pressure pump feeding a single common rail

Definitions

  • the invention relates to an injection system according to the preamble of patent claim 1.
  • a known injection system of the CR type is in EP 1387079 A1 described. It has a high-pressure pump which supplies a rail with fuel via a flow rate control, to which injectors for the individual cylinders are connected.
  • the high-pressure pump is supplied via a low-pressure feed pump, which draws fuel from a tank and delivers it to the high-pressure pump via a pressure relief valve.
  • the pressure in the rail is regulated by means of an electronic control unit.
  • a common rail (CR) and injectors are provided, via which the injection quantity corresponding to the operating pressure in Rail is controlled.
  • the CR is supplied via tappet-operated monoblock pumps, so that the operating pressure in the rail is the same under almost all operating conditions, for example 1400 bar. This is achieved by providing the plungers of the monobloc pumps with a bottom oblique control edge, which cooperates with a diversion bore, depending on the rotational position of the plunger. In this way, the amount of fuel in the rail is deactivated in accordance with the predetermined rail pressure.
  • the present invention has for its object to avoid the disadvantages of the known injection systems and to reduce their expenditure on equipment.
  • the solution according to the invention requires a low energy consumption as a result of the volume control in the monobloc pumps, in each case on their low-pressure side.
  • the control of the rail pressure only requires a pressure sensor and as a safety device, a pressure relief valve which is connected via a return line to the fuel tank. The time required for the pressure-side shutdown on the rail consuming pressure control valve is eliminated.
  • the monobloc pumps each have a rotatable plunger provided with an overhead control edge, the rotational position of which can be controlled by the ECU, in that the rotational position of the control edge suitable for the operating pressure in the rail can be set according to characteristic map specifications.
  • This embodiment of the monobloc pumps as controllable piston pumps realizes a direct volume control in the monobloc pumps with little effort and with low energy consumption. These promote only as much fuel as is necessary to maintain the respective rail pressure provided in the map.
  • the pump plunger is rotated via a control rod actuated by an actuator, which is translationally reciprocated.
  • the actuator is a solenoid, a linear magnet or a servo motor, the actuator receives its path information via the ECU, which operates on the engine map.
  • one or more monobloc pumps may be provided; Accordingly, one or more pump plungers can be actuated by means of a control rod whose adjustment path can be controlled via the ECU.
  • the determined according to the engine map quantity results accordingly the adjustment of the control rod or the phase position of the control edge, which runs between zero promotion and full promotion obliquely to the plunger axis.
  • the control edge is formed as an overhead control edge, with which the flow rate promotion begins only when a suction hole for the fuel flowing into the pump cylinder fuel is covered by the control edge.
  • the height of the control edge and thus the Pumpennutzhub is determined by the respective rotational position of the pump plunger.
  • the overhead control edge allows the energy-saving control of the amount of fuel on the low pressure side of the plunger, i. only after the quantitative metering the high pressure level is reached.
  • a pressure relief valve is provided, which is connected via a return line to the fuel tank.
  • a pressure sensor is connected to the rail, which communicates with the ECU and allows the control of the operating pressure in the rail according to the specifications of the map.
  • a CR system with high-pressure pumps based on monobloc pumps with discharge on the pressure side can be designed for rail pressure values of approx. 1400 bar. Is it possible from the emission limits forth with e.g. 800 bar of injection pressure, low-cost injectors can be used, which in conjunction with mini high-pressure pumps and pump-side Mengenzufug result in a very cost-effective CR system.
  • Fig. 1 two monobloc pumps 1 are provided for supplying the rail 2.
  • the roller tappet of the monobloc pumps 1 are actuated by means of a camshaft 3.
  • the monobloc pumps 1 convey into the rail 2 a quantity of fuel required according to the engine map, which quantity is metered by an electronic control unit 4 via a signal line 5.
  • the signal line 5 is used to control one Fig. 2 closer actuator described in the form of a solenoid 6, which actuates a control rod 7 translationally.
  • the control rod 7 operates the rotation of the plunger 8 of the monobloc pumps 1, so that the control edge 9 is suitably positioned according to the respective pressure buildup with respect to a suction port 10 in the pump cylinder 11.
  • a metered amount of fuel is compressed and fed to the rail 2 via high-pressure lines 12.
  • Each engine cylinder is associated with an injector 13, which is supplied via a high-pressure line 14 from the rail 2.
  • a connected to the rail pressure relief valve 15 is connected via a return line 16 to the fuel tank 17.
  • a pressure sensor 18 is provided, which is connected via a control line 19 to the ECU. Also, the pressure relief valve 15 is connected via a control line 27 to the ECU, so that it may be possible to respond to pressure fluctuations in the rail.
  • the injectors 13 are each connected via a control line 23 to the ECU 4, so that they are controlled according to the map specifications. The injectors 13 are also connected in each case via a leakage line 26 to the fuel tank 17.
  • the delivery of the fuel from the fuel tank 17 to the monobloc pumps 1 takes place by means of a feed pump 20 via a fuel feed line 21, in which a fuel filter 22 is installed.
  • a feed pump 20 is an electric diaphragm pump or a conventional piston pump.
  • the two piston pumps 1 are supplied with fuel at a pressure on the inlet side of up to 2 bar.
  • the compression of the metered amount of fuel is then via the plunger 8 according to the characteristic map controlled positioning of the control edges 9 of the plunger. 8
  • Both monoblock pumps 1 are connected via leakage lines 25 to the fuel tank 17.
  • Fig. 2 a middle rotational position of the control edge 9 of the plunger 8 is shown, whereby a partially throttled Mengenzuflop is realized. Since it is a so-called overhead control edge, the Nutzhub begins after passing over the suction port 10 by the control edge 9, while the plunger 8 is moved in the axial direction upwards.

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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)
EP09011631A 2008-10-02 2009-09-11 Système d'injection pour carburants diesel Ceased EP2172642A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810050380 DE102008050380A1 (de) 2008-10-02 2008-10-02 Einspritzsystem für Dieselkraftstoffe

Publications (1)

Publication Number Publication Date
EP2172642A1 true EP2172642A1 (fr) 2010-04-07

Family

ID=41650184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09011631A Ceased EP2172642A1 (fr) 2008-10-02 2009-09-11 Système d'injection pour carburants diesel

Country Status (2)

Country Link
EP (1) EP2172642A1 (fr)
DE (1) DE102008050380A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113530735A (zh) * 2021-08-05 2021-10-22 思达耐精密机电（常熟）有限公司 一种共轨压力控制阀特性测试系统及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121689A1 (fr) * 1983-03-05 1984-10-17 Robert Bosch Gmbh Dispositif d'injection du combustible pour moteurs à combustion interne
DE4441113C1 (de) * 1994-11-18 1996-04-04 Bosch Gmbh Robert Kraftstoffhochdruckpumpe für Brennkraftmaschinen
DE19508445A1 (de) 1995-03-09 1996-09-12 Kloeckner Humboldt Deutz Ag Kraftstoffeinspritzvorrichtung für eine selbstzündende Brennkraftmaschine
EP1387079A1 (fr) 2002-07-30 2004-02-04 Magneti Marelli Powertrain S.p.A. Système d'injection de carburant à rampe commune comprenant une pompe à débit variable
EP1865193A1 (fr) * 2006-06-09 2007-12-12 CRF Societa'Consortile per Azioni Dispositif d'injection de carburant pour un moteur à combustion interne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3024883A1 (de) * 1980-07-01 1982-02-11 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und einrichtung zur kraftstoffeinspritzung bei brennkraftmaschinen, insbesondere bei dieselmotoren
DE10354919A1 (de) * 2003-11-25 2005-06-30 Motorenfabrik Hatz Gmbh & Co. Kg Elektromagnetisch gesteuerte Aufschalteinheit für nockenbetätigte Einspritzanlage einer Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121689A1 (fr) * 1983-03-05 1984-10-17 Robert Bosch Gmbh Dispositif d'injection du combustible pour moteurs à combustion interne
DE4441113C1 (de) * 1994-11-18 1996-04-04 Bosch Gmbh Robert Kraftstoffhochdruckpumpe für Brennkraftmaschinen
DE19508445A1 (de) 1995-03-09 1996-09-12 Kloeckner Humboldt Deutz Ag Kraftstoffeinspritzvorrichtung für eine selbstzündende Brennkraftmaschine
EP1387079A1 (fr) 2002-07-30 2004-02-04 Magneti Marelli Powertrain S.p.A. Système d'injection de carburant à rampe commune comprenant une pompe à débit variable
EP1865193A1 (fr) * 2006-06-09 2007-12-12 CRF Societa'Consortile per Azioni Dispositif d'injection de carburant pour un moteur à combustion interne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113530735A (zh) * 2021-08-05 2021-10-22 思达耐精密机电（常熟）有限公司 一种共轨压力控制阀特性测试系统及方法

Also Published As

Publication number Publication date
DE102008050380A1 (de) 2010-04-08

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