WO2013045502A1 - Système d'injection à accumulation et procédé de régulation de la pression d'un système d'injection à accumulation - Google Patents

Système d'injection à accumulation et procédé de régulation de la pression d'un système d'injection à accumulation Download PDF

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Publication number
WO2013045502A1
WO2013045502A1 PCT/EP2012/068980 EP2012068980W WO2013045502A1 WO 2013045502 A1 WO2013045502 A1 WO 2013045502A1 EP 2012068980 W EP2012068980 W EP 2012068980W WO 2013045502 A1 WO2013045502 A1 WO 2013045502A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
valve
injection system
accumulator
relief valve
Prior art date
Application number
PCT/EP2012/068980
Other languages
German (de)
English (en)
Inventor
Thomas Kraft
Original Assignee
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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2013045502A1 publication Critical patent/WO2013045502A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves
    • F02M63/0052—Pressure relief valves with means for adjusting the opening pressure, e.g. electrically controlled

Definitions

  • the present invention relates to a storage injection system of a motor vehicle with a high-pressure pump, a high ⁇ pressure accumulator, injectors and a control unit in which a volume flow-based pressure regulator via a volume flow valve, the fuel delivery amount of the high-pressure pump is discharged high-pressure ⁇ discharge valve fuel from the high-pressure accumulator.
  • Such a storage injection system (common rail system) is known.
  • the high-pressure pump delivers fuel into the high ⁇ pressure accumulator from which the injectors take fuel and meter the combustion chamber.
  • a different pressure level is required in the accumulator, which is regulated by the high-pressure pump.
  • the pressure in the high-pressure accumulator is regulated by the delivery quantity of the high-pressure pump.
  • a flow valve is used. If the high-pressure pump delivers the quantity which corresponds to the injector consumption, the pressure in the high-pressure accumulator remains constant. To build up pressure, the high pressure pump must deliver more fuel into the high pressure accumulator than is taken from the injectors. When pressure is reduced, more fuel must be withdrawn from the high-pressure accumulator than the high-pressure pump supplies. Since the injectors do not inject during the engine's overrun phase and they only have very little to no leakage in modern injection systems, the pressure must be reduced with an additional high-pressure relief valve.
  • PCV Pressure Control Valve
  • the present invention has for its object to provide a storage injection system of the type described above, which is characterized by a particularly simple structure.
  • This object is solved by the invention with a spoke pure ⁇ injection system of the type indicated, that the system comprises a single volume-flow-based pressure regulator for both the volume flow control valve and for the high-pressure relief valve and that the high-pressure relief valve is designed as a switchable high-pressure flow valve whose valve ⁇ body by driving the single Pressure regulator between a closed and open position back and forth.
  • a single volume flow-based pressure regulator is used. To regulate the high pressure, it is no longer necessary, as in the previous storage injection systems, between two physically different control principles back and forth. The uniform control concept results in improved pressure control performance.
  • valve body can take only two positions, namely a
  • the high-pressure relief valve opens, and the pressure difference (high-pressure - ambient pressure) above the drainage hole determines the outflowing volume flow.
  • the drain hole here is the throttle point, and there is no
  • the high pressure relief valve is a digital high pressure relief valve. This can be opened and closed by the drain hole of the high-pressure accumulator open and close, so that by controlling the valve required by the regulator discharge amount can be precisely dissipated.
  • a drainage hole is arranged in the housing of the high pressure accumulator, which is opened or closed by the valve body of the high pressure relief valve.
  • the high-pressure relief valve is arranged directly on the high pressure accumulator, so that there is a simple and space-saving design.
  • the open and closed drain hole from the valve body is arranged as a throttle in the valve itself, for example in a plate arranged in the valve body.
  • the present invention further relates to a method for pressure control of a storage injection system of a motor ⁇ vehicle, which has a high-pressure pump, a high-pressure accumulator, injectors and a control unit, in which a volumetric flow-based pressure regulator via a volume flow valve, the fuel delivery amount of the high pressure pump and thus regulates the pressure in the high pressure accumulator and in which fuel is discharged from the high-pressure accumulator via a high-pressure discharge valve.
  • a volumetric flow valve (VCV) and a force-based high-pressure valve (PCV) are used, which operate according to physically different principles, so that two different regulators are required for the two valves, between which must be switched back and forth.
  • the present invention proposes that the volume-flow-based pressure regulator controls the high-pressure relief valve in addition to the volume flow valve that is set at a required pressure reduction in the high-pressure accumulator over the drive time to open the high-pressure relief valve exactly the required by the pressure regulator fuel drainage.
  • the volume flow-based pressure regulator controls a digital high-pressure relief valve.
  • the actuation time of the high-pressure relief valve is dependent on the high pressure in the high-pressure accumulator and is preferably stored in a map, which is accessed by the pressure regulator.
  • the control of the Hoch Kunststoffab ⁇ lassventils takes place according to the controller cycle time in small time ⁇ intervals.
  • the process according to the invention proceeds in the following manner.
  • the volume flow-based pressure regulator outputs a negative volume flow.
  • the flow control valve (VCV) then supplies less by that amount into the high-pressure accumulator than the system consumes (injectors). If now in the
  • the volume-flow-based pressure regulator (volumetric flow controller) still requires a negative volume flow in order to achieve the desired pressure reduction.
  • DPDV Digital Pressure Decay Valve
  • the DPDV opens, and the pressure difference (high pressure - ambient pressure) above the drainage hole determines the outgoing flow rate.
  • the discharge quantity required by the regulator is then set via the actuation time of the DPDV.
  • the actuation time of the DPDV for the discharge amount is dependent on the high pressure and the fuel temperature and is preferably stored in a map.
  • the control of the DPDV takes place in small time intervals in accordance with the controller cycle time (in this case, for example, it makes sense segment ⁇ synchronously with the engine) to produce the most uniform possible pressure reduction.
  • the inventive method thus energy can be saved once, since only the necessary amount from the high ⁇ accumulator to achieve the reduction in pressure is released while the engine overrun phase. There is no additional amount drained as when using a PCV. To regulate the high pressure, it is no longer necessary with the inventive method, as in the previous storage injection systems between two physically different control principles back and forth. Furthermore, a cost saving by using a simple valve (digital valve), achieved by a simplified controller calibration and by a simplified control concept in the function ⁇ development.
  • the valve can only close completely or open completely, ie the valve body can not assume an intermediate position.
  • the discharge of the prescribed by the pressure regulator drainage is therefore only by setting a certain opening time, during which the valve is in the fully open state. Therefore, the driving time of the high pressure relief valve determines the volume flow to be drained Vo ⁇ .
  • the valve is preferably cyclically driven, ie cyclically opened and closed, to dissipate the corresponding discharge amount.
  • Figure 1 is a schematic representation of a high-pressure pump according to the prior art
  • Figure 2 is a schematic representation of a digital signal
  • FIG. 3 is a schematic section through another
  • Embodiment of a high-pressure discharge valve Embodiment of a high-pressure discharge valve.
  • FIG. 1 shows a schematic representation of a high-pressure pump of a storage injection system of a motor vehicle according to the prior art.
  • the high pressure pump has a pump piston ⁇ , with the fuel from a low pressure side 3 to a high pressure side 4, which is a high-pressure accumulator is promoted.
  • an inlet valve 7 and an outlet valve 8 are provided in the corresponding fuel line.
  • a volume ⁇ flow valve 2 On the low pressure side 3 of the pump is a volume ⁇ flow valve 2, by means of which the fuel delivery amount of the high pressure pump by variable opening of the
  • the high-pressure valve 6 is a force-based high-pressure valve, via the electromagnet, a force is set, which leads to a certain high pressure in the high-pressure accumulator.
  • the resulting back pressure on the valve body or closing body of the high-pressure valve, caused by the outflow Volu ⁇ menstrom, is in equilibrium with the magnetic force, so that the force used is equivalent to the pressure.
  • the volume flow valve 2 and the high pressure valve 6 each have their own controller (not shown) assigned, between which must be switched back and forth during operation of the system. Each of these switching operations causes pressure fluctuations in the
  • the high-pressure valve or high-pressure discharge valve used is the digital high-pressure relief valve shown in FIG. 2, which is shown in the upper illustration in the closed and in the lower depiction of FIG. 2 in the open state.
  • This digital high-pressure relief valve (DPDV) 10 is arranged directly on the high ⁇ pressure accumulator 11 of the storage injection system and opens and closes a drain hole 12 of the high-pressure accumulator 11. The valve is from an open position into a
  • valve body or closing body can occupy only two positions, namely the closed position shown in Figure 2 above and the open position shown in Figure 2 below. In the above shown
  • the drain hole 12 is locked so that no fuel can be discharged from the high-pressure accumulator.
  • the closing body releases the drain hole 12, so that fuel can be discharged downwards via the line 13, as indicated at 14. The drained amount of fuel is thereby through the Activation time of the high-pressure relief valve, over which the
  • Closing body is opened, set.
  • This activation time for the amount of discharge is dependent on the high pressure and the force ⁇ fuel temperature and is stored in a characteristic diagram.
  • the control of the high-pressure discharge valve takes place in accordance with the controller cycle time in small time intervals in order to produce the most uniform possible pressure reduction.
  • the high-pressure relief valve is no longer activated and closed.
  • the volume flow control valve 2 then takes over again the pressure control alone.
  • FIG. 3 shows a further embodiment of a high-pressure discharge valve in a schematic longitudinal section.
  • Guide die in this off the open and by a valve body 20 closed throttled discharge hole 21 is arranged in the valve itself, in a 23 in the valve housing 22 are ⁇ translated platelets
  • the valve is substantially conventional and has a pole core 25 , a magnet 26, an armature 27 and a spring 28. If the
  • Valve body 20 the drain hole 21 opens, fuel flows from the high-pressure accumulator via the valve housing 22 provided in the drain hole 21 and outlet hole 24 from.

Landscapes

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

Abstract

L'invention concerne un système d'injection à accumulation d'un véhicule automobile, ainsi qu'un procédé permettant de réguler la pression dudit système d'injection à accumulation. Le système comporte un unique régulateur de pression basé sur le flux volumique à la fois pour une soupape de flux volumique et pour une soupape d'évacuation haute pression (10). La soupape d'évacuation haute pression (10) est réalisée sous la forme d'une soupape de flux volumique haute pression commutable, dont le corps de soupape peut être déplacé en va-et-vient entre une position d'ouverture et une position de fermeture par l'activation de l'unique régulateur de pression. Le procédé de régulation de la pression consiste à réguler la soupape d'évacuation haute pression (10) de telle manière qu'elle évacue exactement la quantité de carburant requise par le régulateur de pression.
PCT/EP2012/068980 2011-09-28 2012-09-26 Système d'injection à accumulation et procédé de régulation de la pression d'un système d'injection à accumulation WO2013045502A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011083628.4 2011-09-28
DE201110083628 DE102011083628A1 (de) 2011-09-28 2011-09-28 Speichereinspritzsystem und Verfahren zur Druckregelung eines Speichereinspritzsystems

Publications (1)

Publication Number Publication Date
WO2013045502A1 true WO2013045502A1 (fr) 2013-04-04

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Application Number Title Priority Date Filing Date
PCT/EP2012/068980 WO2013045502A1 (fr) 2011-09-28 2012-09-26 Système d'injection à accumulation et procédé de régulation de la pression d'un système d'injection à accumulation

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Country Link
DE (1) DE102011083628A1 (fr)
WO (1) WO2013045502A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013220816A1 (de) 2013-10-15 2015-04-16 Continental Automotive Gmbh Druckbegrenzungsventil für ein Kraftstoffeinspritzsystem und Kraftstoffeinspritzsystem
DE102016207521B4 (de) * 2016-05-02 2023-06-29 Vitesco Technologies GmbH Druckregelventil und Kraftstoffeinspritzsystem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100247A1 (fr) * 2002-05-23 2003-12-04 Robert Bosch Gmbh Accumulateur haute pression pour systemes d'injection de carburant avec soupape de regulation de pression integree
JP2005155421A (ja) * 2003-11-25 2005-06-16 Toyota Motor Corp 内燃機関の燃料噴射装置
DE102007026834A1 (de) * 2007-06-06 2008-12-11 Hydraulik-Ring Gmbh Elektromagnetisches Regelventil und Einspritzanlage für eine Brennkraftmaschine
US20110125387A1 (en) * 2009-11-26 2011-05-26 Denso Corporation Fuel supply system having pressure control valve

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10003298A1 (de) * 2000-01-27 2001-08-02 Bosch Gmbh Robert Verfahren und Vorrichtung zur Druckregelung
DE102007054496B4 (de) * 2006-11-14 2013-03-14 Hydraulik-Ring Gmbh Hochdruckventil für Dieseleinspritzanlagen mit Gleichdruckverhalten
DE102007059352B3 (de) * 2007-12-10 2009-06-18 Continental Automotive Gmbh Kraftstoffdruckregelsystem und Kraftstoffdruckregelverfahren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100247A1 (fr) * 2002-05-23 2003-12-04 Robert Bosch Gmbh Accumulateur haute pression pour systemes d'injection de carburant avec soupape de regulation de pression integree
JP2005155421A (ja) * 2003-11-25 2005-06-16 Toyota Motor Corp 内燃機関の燃料噴射装置
DE102007026834A1 (de) * 2007-06-06 2008-12-11 Hydraulik-Ring Gmbh Elektromagnetisches Regelventil und Einspritzanlage für eine Brennkraftmaschine
US20110125387A1 (en) * 2009-11-26 2011-05-26 Denso Corporation Fuel supply system having pressure control valve

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Publication number Publication date
DE102011083628A1 (de) 2013-03-28

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