EP1826396A1 - Système d'Injection Rampe Commune - Google Patents

Système d'Injection Rampe Commune Download PDF

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Publication number
EP1826396A1
EP1826396A1 EP06124129A EP06124129A EP1826396A1 EP 1826396 A1 EP1826396 A1 EP 1826396A1 EP 06124129 A EP06124129 A EP 06124129A EP 06124129 A EP06124129 A EP 06124129A EP 1826396 A1 EP1826396 A1 EP 1826396A1
Authority
EP
European Patent Office
Prior art keywords
rail
fuel
pressure
valve device
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.)
Granted
Application number
EP06124129A
Other languages
German (de)
English (en)
Other versions
EP1826396B1 (fr
Inventor
Martin Kessler
Stephan Tafel
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 EP1826396A1 publication Critical patent/EP1826396A1/fr
Application granted granted Critical
Publication of EP1826396B1 publication Critical patent/EP1826396B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/04—Fuel pressure pulsation in common rails
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M63/0043—Two-way valves

Definitions

  • the invention relates to a common rail fuel system according to the preamble of claim 1.
  • the invention further relates to a method for operating a common rail fuel system according to the preamble of the independent claim.
  • Common rail fuel systems are known from the market, in which the fuel is conveyed from a fuel tank via an electric pre-feed pump to a mechanically driven high-pressure pump. This compresses the fuel to a very high pressure and further promotes it in a high-pressure fuel storage, which is also referred to as a "common rail". To these several injectors are connected, which inject the fuel directly into their associated combustion chambers.
  • the injection processes through the individual injectors are pulsed. This only very brief outflow of fuel from the rail via the injectors can cause significant pressure fluctuations or pressure oscillations in the rail. These pressure oscillations continue in those areas of the common rail fuel system that are directly connected to the rail, for example, to other injectors. In other words, the operation of an injector leads to a pressure oscillation in the rail, which influences the metering accuracy of the other injectors.
  • Object of the present invention is to provide a common rail fuel system, in whose high-pressure region, in particular in the rail, there is a constant possible pressure. This should be possible with simple means and little effort.
  • the inventively provided valve device which is connected to the rail, influence is taken on the dynamic pressure in the rail by the inflow and / or outflow of fuel from the rail is affected.
  • the valve device is controlled for this purpose in such a way that high-frequency pressure oscillations of the fuel stored in the rail are reduced. This can be done, for example, by allowing fuel to flow out of the rail during a pressure peak and / or by reducing or stopping the flow of fuel to the rail. Conversely, in the case of a pressure chamber, an inflow of fuel can be allowed to be increased and / or an outflow can be prevented.
  • a simple realization is, for example, to control the valve device with the frequency of the high-frequency vibrations and optionally with a phase shift with respect to the high-frequency oscillations.
  • the high-frequency vibrations can either be detected by a sensor or calculated by means of a suitable numerical model.
  • the rail itself and the components connected to the rail are relieved in this way, which benefits their life comes.
  • the valve device can also be controlled with a pre-controlled signal, which depends, for example, on a rotational speed and an operating point of the internal combustion engine.
  • the inventively provided valve device can work without burdening an electrical power supply strong.
  • the power loss of such an electric valve device is low, with correspondingly low heat generation.
  • the valve device according to the invention can also build comparatively small. Powerful and therefore costly adjusting device together with associated power output stages are not required. Overall, the smoothing of the pressure oscillations is made possible by the inventively provided valve device and their corresponding control with little effort and low cost.
  • valve device is arranged fluidically in a delivery line between the fuel pump and the rail.
  • a valve device in a return line between the rail and, for example, a low pressure region, but this would considerably reduce the efficiency of the common rail fuel system. This effect is avoided by an arrangement between the fuel pump and rail.
  • valve device is arranged in a bypass line to a delivery line between the fuel pump and rail, and that the bypass line is connected to a hydraulic storage volume.
  • the main supply of the rail so the setting of the prevailing in this mean fuel pressure, directly via the promotion of the fuel from the fuel pump via the delivery line to the rail.
  • the "alternating portion" of the fuel pressure in the rail is reduced by the hydraulic storage volume, which is switched by means of the valve device depending on the high-frequency pressure oscillations more or less (at a pressure relief valve valve device) or digitally (at a switching valve valve device).
  • the valve device may comprise, for example, a pressure relief valve. This is then controlled by a signal which corresponds to the one to be attenuated Pressure oscillations is modulated. In this way, even low-frequency pressure oscillations can be smoothed relatively clean.
  • a simple design variant comprises a valve device with a switching valve.
  • the fuel flow delivered to the rail by the fuel pump is "clocked" in accordance with the pressure vibrations to be damped.
  • a common-rail fuel system as a whole bears the reference numeral 10. It belongs to an internal combustion engine, which, however, is not shown in detail. The internal combustion engine in turn serves to drive a motor vehicle, which is likewise not shown in FIG.
  • the common rail fuel system 10 includes a fuel tank 12 from which an electric feed pump 14 delivers the fuel to a high pressure fuel pump 16 mechanically driven by the engine. This is generally a piston pump. From the high-pressure fuel pump 16, a delivery line 18 leads to a high-pressure fuel accumulator 20, to which a plurality of injectors 22 are connected.
  • the high-pressure fuel accumulator 20 is therefore also referred to as “rail” or “common rail”.
  • the injectors 22 inject the fuel directly into a respective associated combustion chamber (not shown).
  • the pressure of the fuel which prevails in the rail 20 is detected by a pressure sensor 24 in the present exemplary embodiment.
  • the corresponding signal 26 is fed to a control and regulating device 28.
  • a valve device 30 is arranged in the delivery line 18 between the high-pressure fuel pump 16 and rail 20, .
  • this comprises a pressure regulating or pressure limiting valve 32 with a magnetic actuator 34.
  • the latter receives a corresponding control signal 36 from the control and regulating device 28.
  • the injectors 22 are alternately driven in accordance with a firing order of the internal combustion engine to inject the fuel into the combustion chambers.
  • the injection is usually carried out in the form of a comparatively short injection pulse.
  • a pressure p of the fuel in the rail 20 decreases, whereas it rises again between two injections due to the subsequent delivery by the high-pressure fuel pump 16, corresponding to the dashed curve in FIG.
  • the pressure control valve 32 of the valve device 30 is controlled by the control and regulating device 28 with the frequency of the high-frequency oscillations and optionally with a phase shift relative to the high-frequency vibrations of the pressure in the rail 20.
  • a control signal 36 is generated by the control and regulating device 28, which is modulated depending on the signal 26 of the pressure sensor 24.
  • FIG. 10 An alternative embodiment of a common rail fuel system 10 is shown in FIG.
  • elements and regions which have equivalent functions to previously described elements and regions bear the same reference numerals and are not explained again in detail.
  • valve means 30, which is arranged in the delivery line 18 between the high-pressure fuel pump 16 and rail 20, no pressure control valve, but a switching valve in the form of a 2/2-way valve 42.
  • the mean pressure in the rail 20th is set via a separate pressure control valve 44.
  • the volume flow flowing from the high-pressure fuel pump 16 via the delivery line 18 to the rail 20 is "clocked" by means of the switching valve 42.
  • FIG 4 A further modified embodiment is shown in FIG 4: In this fluidly parallel to the delivery line 18, a bypass line 46 is present in the, seen from the high-pressure fuel pump 16 to the rail 20, first a check valve 48, then a hydraulic storage volume 50 and finally the already off Figures 1 and 3 known valve means 30 are arranged in the form of a pressure control valve 32.
  • the check valve 48 shuts off the area between the high-pressure fuel pump 16 and the hydraulic storage volume 50 to the hydraulic storage volume 50.
  • valve means 30 is used with the pressure control valve 32 to reduce pressure oscillations in the rail 20.
  • the setting of the average value of the pressure in the rail 20 substantially via the adjustable delivery of the high-pressure fuel pump 16, whereas the reduction of the actual vibrations, ie the alternating component of the pressure p in the rail 20, through the over the pressure control valve 32 modulated addition of the hydraulic accumulator volume 50 is happening.
  • the pressure regulating valve 32 arranged in the bypass line 46 can also be realized by a switching valve 42.
  • the connection of the rail 20 with the hydraulic storage volume 50 is "clocked".
  • a pressure sensor 24 is at least not suitable for the smoothing function of the pressure curve which is in the foreground here is provided in the rail 20. Instead, a numerical model of the pressure conditions in the rail 20 is used to generate the control signal 36.

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP06124129A 2005-12-27 2006-11-15 Système d'Injection Rampe Commune Not-in-force EP1826396B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005062548A DE102005062548A1 (de) 2005-12-27 2005-12-27 Common-Rail-Kraftstoffsystem

Publications (2)

Publication Number Publication Date
EP1826396A1 true EP1826396A1 (fr) 2007-08-29
EP1826396B1 EP1826396B1 (fr) 2009-08-12

Family

ID=38135705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06124129A Not-in-force EP1826396B1 (fr) 2005-12-27 2006-11-15 Système d'Injection Rampe Commune

Country Status (3)

Country Link
EP (1) EP1826396B1 (fr)
AT (1) ATE439516T1 (fr)
DE (2) DE102005062548A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015167883A1 (fr) * 2014-04-28 2015-11-05 Fca Us Llc Techniques d'annulation active des impulsions de pression de carburant d'un moteur
WO2016066407A1 (fr) * 2014-10-30 2016-05-06 Robert Bosch Gmbh Procédé d'exploitation d'un système d'alimentation en carburant de moteur à combustion interne et système d'alimentation en carburant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4404111B2 (ja) * 2007-07-19 2010-01-27 トヨタ自動車株式会社 内燃機関の燃料噴射制御装置
DE102007053403B4 (de) * 2007-11-09 2016-06-09 Continental Automotive Gmbh Verfahren und Vorrichtung zum Bestimmen einer schwingungsoptimierten Einstellung einer Einspritzvorrichtung
JP2013092071A (ja) * 2011-10-24 2013-05-16 Toyota Motor Corp 内燃機関制御装置及び内燃機関
GB201316439D0 (en) * 2013-09-16 2013-10-30 Delphi Tech Holding Sarl Hybrid fuel injection equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753072A1 (de) * 1997-11-29 1999-06-02 Bosch Gmbh Robert Kraftstoffversorgungssystem für eine Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE19841329A1 (de) * 1998-09-10 2000-03-23 Daimler Chrysler Ag Einspritzanlage für einen Verbrennungsmotor und Betriebsverfahren hierfür
EP1403509A2 (fr) * 2002-09-27 2004-03-31 Robert Bosch Gmbh Dispositif de limitation de pression et système de combustible avec tel dispositif de limitation de pression
GB2402233A (en) * 2003-05-30 2004-12-01 Ford Global Tech Llc A method for controlling pressure fluctuations in high pressure fuel injector supply lines
DE10328789A1 (de) * 2003-06-26 2005-01-27 Robert Bosch Gmbh Verfahren und Vorrichtung zur druckwellenkompensierenden Steuerung eines Einspritzsystems einer Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753072A1 (de) * 1997-11-29 1999-06-02 Bosch Gmbh Robert Kraftstoffversorgungssystem für eine Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE19841329A1 (de) * 1998-09-10 2000-03-23 Daimler Chrysler Ag Einspritzanlage für einen Verbrennungsmotor und Betriebsverfahren hierfür
EP1403509A2 (fr) * 2002-09-27 2004-03-31 Robert Bosch Gmbh Dispositif de limitation de pression et système de combustible avec tel dispositif de limitation de pression
GB2402233A (en) * 2003-05-30 2004-12-01 Ford Global Tech Llc A method for controlling pressure fluctuations in high pressure fuel injector supply lines
DE10328789A1 (de) * 2003-06-26 2005-01-27 Robert Bosch Gmbh Verfahren und Vorrichtung zur druckwellenkompensierenden Steuerung eines Einspritzsystems einer Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015167883A1 (fr) * 2014-04-28 2015-11-05 Fca Us Llc Techniques d'annulation active des impulsions de pression de carburant d'un moteur
WO2016066407A1 (fr) * 2014-10-30 2016-05-06 Robert Bosch Gmbh Procédé d'exploitation d'un système d'alimentation en carburant de moteur à combustion interne et système d'alimentation en carburant

Also Published As

Publication number Publication date
DE502006004505D1 (de) 2009-09-24
ATE439516T1 (de) 2009-08-15
EP1826396B1 (fr) 2009-08-12
DE102005062548A1 (de) 2007-07-05

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