WO2007017276A1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant Download PDF

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Publication number
WO2007017276A1
WO2007017276A1 PCT/EP2006/007898 EP2006007898W WO2007017276A1 WO 2007017276 A1 WO2007017276 A1 WO 2007017276A1 EP 2006007898 W EP2006007898 W EP 2006007898W WO 2007017276 A1 WO2007017276 A1 WO 2007017276A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
injection system
polar
sensor
molekülseparator
Prior art date
Application number
PCT/EP2006/007898
Other languages
German (de)
English (en)
Inventor
Giacomo G. Sciortino
Joachim Kiefer
Original Assignee
Delphi Technologies, Inc.
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
Priority claimed from EP05017332A external-priority patent/EP1752651A1/fr
Application filed by Delphi Technologies, Inc. filed Critical Delphi Technologies, Inc.
Priority to JP2008525481A priority Critical patent/JP2009504963A/ja
Publication of WO2007017276A1 publication Critical patent/WO2007017276A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • 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
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/24—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means
    • F02M37/26—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing 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
    • 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
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/36—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements with bypass 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention relates to a fuel injection system comprising an injection valve, a fuel pump disposed in a fuel line upstream of the valve, and a molecular separator disposed in the fuel line upstream of the pump, and more particularly between the pump and a fuel tank, through which prior to introduction of the fuel into the Pump, the amount of a polar component of the fuel is selectively reducible to a non-polar component of the fuel.
  • Such a fuel injection system is basically known, for example, from US Pat. No. 5,149,433 and EP-A-0 311 162.
  • a fuel injection system of the type mentioned is used for example in the automotive field in common-rail diesel engines.
  • the fuel pump of a common rail diesel injection system is a high pressure pump that increases the pressure of the diesel fuel in a pressure accumulator tube upstream of the engine cylinders to 2000 bar or more.
  • injection valves assigned to the engine cylinders the supply of the pressurized fuel to the respective engine cylinder is controlled.
  • the invention has for its object to provide a fuel injection system, which helps to ensure optimum function of the injector permanently.
  • the object is achieved by a fuel injection system having the features of claim 1 and in particular by the fact that a sensor for measuring the amount of the polar constituent of the fuel downstream of the Molekülseparator is arranged.
  • the sensor can be arranged, for example, between the molecule separator and the pump.
  • the sensor allows monitoring of the function of the molecular separator and the efficiency of the separation process and, in the event of insufficient reduction in the amount of polar constituent, may cause appropriate action to protect the injector, such as repeated filtering of the fuel or disconnection of the injector from the fuel supply , As a result, damage to the injector by the polar component of the fuel can be effectively prevented.
  • the senor is continuously active, as soon as the fuel starts to flow, in other words under normal operating conditions of the injection system, in cold start situations and under such conditions in which the amount of a polar fuel component has increased or may increase for environmental reasons, such as eg after a long service life of the vehicle or in case of excessive humidity.
  • the sensor may have a single measuring element or comprise at least two identical measuring elements.
  • a plurality of spaced sensing elements may be disposed downstream of the molecular separator to monitor the amount of polar constituent over a longer flow path of the fuel. This increases the reliability and accuracy of the measurement result.
  • at least two different measuring elements can be arranged downstream of the molecule separator.
  • at least one second measuring element for monitoring the amount of a second polar constituent for example the methanol content
  • the fuel injection system according to the invention is particularly well suited for use with a piezoelectric injection valve, in particular with a piezoelectric injection valve, in which a piezoelectric actuator for actuating the injection valve in the fuel flow path is arranged and directly exposed to the fuel at least when the valve is open.
  • the concentration of water in diesel available in Western Europe is about 200 ppm.
  • Tests carried out at a temperature of 40 ° C. have shown that the permeation of water vapor, which is present in a comparable concentration in helium gas, through the commonly used, a fluoropolymer, such as PVDF, PTFE, ETFE or FEP,
  • the encapsulating material comprised is about 0.833 g-mm / (m 2 -d) and thus substantially greater than the permeation of diesel fuel, which at the same temperature is only 0.014 g-mm / (m 2 -d).
  • hydrophobic substances such as diesel fuel
  • polar substances e.g. Water or alcohol
  • the invention pursues a completely different approach, namely the reduction of the content of a polar component of the fuel, for example, the molecular proportion of undissolved water and / or the alcohol molecule content, by means of a Molekülseparators before the entry of the fuel into the piezoelectric injector.
  • the molecule separator separates the undissolved water molecules or the alcohol molecules from the non-polar constituent of the fuel and separates them.
  • the water or alcohol is filtered out of the fuel, so to speak.
  • the amount of the polar fuel component can be reduced to such an extent that the piezoelectric actuator can be used even for longer periods of time. does not damage the fuel.
  • a durability of the piezoelectric injector and consequently of the fuel injection system as a whole can be achieved, which meets the practical requirements.
  • the molecular separator is designed such that it reduces the proportion of the polar constituent of the fuel and in particular the molecular fraction of undissolved water and / or the alcohol molecule fraction to less than 20 ppm. Experiments have shown that such a low water content in diesel fuel does not adversely affect the functionality of a piezoelectric actuator.
  • a bypass mechanism is provided to redirect fuel once passed through the molecular separator through the molecular separator.
  • the bypass mechanism may be configured to continuously re-introduce a partial flow of the fuel that has flowed through the molecular separator into the molecular separator to thereby achieve continuous multiple filtration of at least a portion of the fuel and thus further reduce the amount of the polar constituent.
  • the bypass mechanism may be configured so that fuel once flowed through the molecular separator is redirected through the molecular separator only when the amount of the polar fuel component measured by a sensor disposed downstream of the molecule separator has a predetermined threshold, e.g. 20 ppm, exceeds. In other words, multiple filtering of the fuel is carried out only until the quantity of the monitored polar constituent falls below the predetermined threshold again.
  • a predetermined threshold e.g. 20 ppm
  • the bypass mechanism may comprise a switching valve coupled to the sensor which is arranged downstream of the sensor and through which fuel which has flowed through the molecular separator can be diverted into a bypass conduit bridging the molecule separator ,
  • the molecule separator may be a multi-stage separator or may comprise a plurality of identical separator elements connected in series.
  • the molecule separator may comprise a fully automatic system for separating water and / or alcohol, which preferably comprises a, e.g. powered by a 24V electrical system of the motor vehicle, has heating, can be prevented by the freezing of the separated water at low outdoor temperatures.
  • the system may include a plurality of sequentially connected separators operating in a cascade mode.
  • the reduction of the amount of the polar fuel component may be due to a chemical and / or physical absorption of molecules of the polar constituent or may be through a selective membrane.
  • the molecular separator has a porous medium which absorbs the polar component but not the non-polar component of the fuel.
  • the porous medium may comprise, for example, a silicate layer system.
  • the molecule separator has a, e.g. planar or tubular, selective membrane.
  • the membrane may comprise a membrane pair consisting of a cation and an anion exchange membrane.
  • injection system shown in the figure is a common rail system for injection of diesel fuel in a motor vehicle diesel engine.
  • the diesel engine of the embodiment shown has four cylinders, but the number of cylinders can also be selected other than s.
  • each cylinder Associated with each cylinder is an injection valve 10 which controls the supply of fuel to the cylinder.
  • the injection valves 10 are piezoelectric injectors, so-called piezo injectors, which are opened or closed by means of a piezoelectric actuator, which is arranged in the flow path of the fuel and thus directly exposed to the fuel.
  • Diesel fuel is supplied from a fuel tank 14 to the injection valves 10 via a fuel line 12.
  • the fuel tank 14 is filled with diesel fuel available in Western Europe which has a comparatively high water content of typically about 200 ppm.
  • a water molecule sleeve separator 16 is arranged in the fuel line 12 which the molecular fraction of undissolved water in the fuel can be reduced to less than 20 ppm. Such a low water content is harmless for the piezoelectric injectors 10.
  • the undissolved water molecules are separated from the non-polar component of the fuel and effectively filtered out of the fuel.
  • the reduction of the water content can be based, for example, on a chemical and / or physical absorption of water molecules or by means of a selective membrane.
  • a sensor 18 Downstream of the water molecule sleeve 16, a sensor 18 is arranged, which monitors the water content of the fuel which has flowed through the separator 16. Exceeds the detected by the sensor 18 water content of the filtered fuel exceeds a predetermined
  • Threshold e.g. of 20 ppm
  • the sensor activates a switching valve 20 located downstream of the sensor 18 in the fuel line 12 to redirect the fuel from the fuel line 12 to a bypass line 22.
  • the bypass line 22 is connected at one end to the switching valve 20 and at its other end upstream of the Molekülseparator 16 to the fuel line 12, in a located between the Molekülseparator 16 and the fuel tank 14 portion of the fuel line 12th
  • Filtered fuel with a water content exceeding the predetermined threshold value is thus returned via the bypass line 22 and passed through the molecular separator 16 again.
  • the water separation process is repeated until it leaves the molecule separator 16 leaking fuel has a water content that falls below the predetermined threshold.
  • filtered fuel whose water content is within a permissible range passes through the switching valve 20 and is supplied through the fuel line 12 of a high-pressure pump 24, through which the pressure of the fuel to 2000 bar or more is increased.
  • the pressurized by the high pressure pump 24 fuel is stored in a pressure accumulator tube 26 and passes from there into the individual injectors 10th
  • the injection system according to the illustrated embodiment is provided for the Western European market and thus for the use of diesel fuel with an increased water content.
  • diesel available in South America typically contains methanol. Similar to an increased water content and an increased methanol content of the fuel affects the function of the piezoelectric actuators and thus the injection valves 10. Accordingly, the arrangement of a proportion of methanol molecule reducing the Molekülparators between the fuel tank and the high-pressure pump is provided for the South American market.
  • the molecule separator can be selected such that it filters out all polar constituents from the fuel, or a separator arrangement comprising a plurality of individual separator elements is produced each filter out one of the harmful components from the fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

L'invention concerne un système d'injection de carburant comprenant une soupape d'injection (10), une pompe de carburant (24) montée en amont de la soupape (10) dans une conduite de carburant (12) et un séparateur de molécules (16) disposé dans la conduite de carburant en amont de la pompe (24), entre la pompe (24) et un réservoir de carburant (14). Avant que le carburant ne pénètre dans la pompe (24), une quantité de composant polaire du carburant est réduite de manière sélective en composant non polaire du carburant.
PCT/EP2006/007898 2005-08-09 2006-08-09 Systeme d'injection de carburant WO2007017276A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008525481A JP2009504963A (ja) 2005-08-09 2006-08-09 燃料噴射システム

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP05017332A EP1752651A1 (fr) 2005-08-09 2005-08-09 Système d'injection de carburant
EP05017332.7 2005-08-09
EP06014945.7 2006-07-18
EP06014945A EP1752652A1 (fr) 2005-08-09 2006-07-18 Système d'injection de carburant

Publications (1)

Publication Number Publication Date
WO2007017276A1 true WO2007017276A1 (fr) 2007-02-15

Family

ID=37027596

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/007898 WO2007017276A1 (fr) 2005-08-09 2006-08-09 Systeme d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1752652A1 (fr)
JP (1) JP2009504963A (fr)
WO (1) WO2007017276A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311162A2 (fr) * 1987-10-09 1989-04-12 Separation Dynamics Inc Système d'alimentation en carburant
US5149433A (en) * 1991-08-05 1992-09-22 Desalination Systems, Inc. Method and apparatus for supply of decontaminated fuel to diesel engine
DE10158547A1 (de) * 2000-11-30 2002-06-06 Denso Corp Brennkraftmaschinen-Kraftstoffeinspritzsystem
US20040004039A1 (en) * 2000-03-30 2004-01-08 Warner Timothy Neal Molecule separation device and method combining multiple filtration media

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11107782A (ja) * 1997-10-02 1999-04-20 Hino Motors Ltd 分配型燃料噴射ポンプの制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311162A2 (fr) * 1987-10-09 1989-04-12 Separation Dynamics Inc Système d'alimentation en carburant
US5149433A (en) * 1991-08-05 1992-09-22 Desalination Systems, Inc. Method and apparatus for supply of decontaminated fuel to diesel engine
US20040004039A1 (en) * 2000-03-30 2004-01-08 Warner Timothy Neal Molecule separation device and method combining multiple filtration media
DE10158547A1 (de) * 2000-11-30 2002-06-06 Denso Corp Brennkraftmaschinen-Kraftstoffeinspritzsystem

Also Published As

Publication number Publication date
EP1752652A1 (fr) 2007-02-14
JP2009504963A (ja) 2009-02-05

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