EP0351631A1 - Dispositif de commande pour un injecteur de combustible - Google Patents

Dispositif de commande pour un injecteur de combustible Download PDF

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Publication number
EP0351631A1
EP0351631A1 EP89112156A EP89112156A EP0351631A1 EP 0351631 A1 EP0351631 A1 EP 0351631A1 EP 89112156 A EP89112156 A EP 89112156A EP 89112156 A EP89112156 A EP 89112156A EP 0351631 A1 EP0351631 A1 EP 0351631A1
Authority
EP
European Patent Office
Prior art keywords
valve seat
valve body
control device
pressure
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
EP89112156A
Other languages
German (de)
English (en)
Other versions
EP0351631B1 (fr
Inventor
Michael Dipl.-Ing. Zipprath
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.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager Schaeffler OHG
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 INA Waelzlager Schaeffler OHG filed Critical INA Waelzlager Schaeffler OHG
Publication of EP0351631A1 publication Critical patent/EP0351631A1/fr
Application granted granted Critical
Publication of EP0351631B1 publication Critical patent/EP0351631B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using 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
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/502—Springs biasing the valve member to the open position
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a control device for a fuel injection nozzle of an internal combustion engine, in particular a diesel engine, with a displaceably guided valve body controlled by a drive element, which forms a valve seat and has an interior, and with a pressure space between an inlet and the valve seat, wherein at closed valve seat in the pressure chamber builds up an injection pressure for the injection nozzle and when the valve seat is open there is pressure equalization between the pressure chamber and an outlet.
  • the drive element for example electronically controlled, emits a force-displacement pulse with which the valve seat is closed. This is in a fuel return line. By closing the valve seat, a desired, high injection pressure builds up on the injection nozzle of the relevant cylinder of the internal combustion engine.
  • valve seat is provided at the end of the valve body near the drain.
  • the volume of the pressure chamber is correspondingly large.
  • a large-volume pressure chamber is unfavorable, however, since a correspondingly large fuel volume must be pressurized when the valve seat is closed.
  • the valve seat is opened, the fuel must flow outside the valve body. A comparatively high flow resistance is to be expected, which delays the pressure equalization.
  • the object of the invention is to improve a control device of the type mentioned in such a way that, on the one hand, the pressure build-up takes place quickly when the valve seat is closed and, on the other hand, the pressure equalization takes place quickly when the valve seat is open.
  • the above object is achieved in a control device of the type mentioned at the outset in that the valve seat is formed by the end of the valve body which is close to the inlet, that when the valve seat is open, the pressure chamber communicates with the interior of the valve body via the valve seat and that the interior is connected to the valve body Process is open.
  • the volume of the pressure chamber which lies between the inlet and the valve seat, is comparatively small. Accordingly, only a small volume of fuel needs to be pressurized to open the injector. This accelerates the pressure build-up.
  • the pressure chamber communicates with the comparatively large-volume interior of the valve body.
  • the flow resistance during pressure equalization is low, so that pressure equalization takes place quickly.
  • valve body has a comparatively small, moving mass. It has a tubular shape and does not need any outside Area where the fuel flows out when the pressure is equalized. Overall, the control characteristic of the control device is improved by the measures described.
  • valve seat diameter on the valve body is smaller than its guide diameter.
  • a tubular valve body (2) is slidably mounted in a valve housing (1).
  • the guide diameter of the valve body (2) in the valve housing (1) is designated D1.
  • a valve seat (4) is formed between one end edge (3) of the valve body (2) and the valve housing (1).
  • the valve seat diameter is designated D2. This is slightly smaller than the guide diameter D1.
  • the valve body (2) forms an interior (5).
  • the valve seat (4) is shown in its open position in the figure.
  • the compression spring (7) presses the valve body (2) with its end edge (8) facing away from the end edge (3) against a stop ring (9) via the snap ring (6).
  • cup part (10) On the front edge (8) there is a cup part (10) which is connected to a membrane (11).
  • the cup part (10) is provided with openings (12) which lead to an outlet (13) to lead.
  • the interior (5) is thus open to the drain (13).
  • a play compensation element (15) is arranged in an upper part (14) of the valve housing (1), which on the one hand abuts the cup part (10) and on the other hand is acted upon by a drive element (16).
  • An inlet (17) is provided on the valve body (2).
  • An annular pressure chamber (18) is formed between this and the valve seat (4).
  • the valve housing (1) is inserted into a base body (19). It is held in this by means of a screw sleeve (20).
  • the sequence (13) continues in the base body (19).
  • a further outlet (21) is provided on the valve body (2) in the area of the interior (5). This is assigned to a corresponding opening (22) in the base body (19).
  • the base body (19) is designed so that only one of the processes (13, 21) is effective.
  • the drain (13 or 21) is connected to the low pressure side of an injection pump, not shown.
  • An injection nozzle, not shown, and the inlet (17) are located on the high-pressure side thereof.
  • Fuel is supplied by the injection pump through the inlet (17), the pressure chamber (18), the valve seat (4), the interior (5) and the outlet (13 or 21) connected in each case. No pressure builds up in the pressure chamber (18), so that the injection nozzle is closed.
  • the compression spring (7) keeps the valve seat (4) open.
  • the drive element (16) If the drive element (16) is actuated, for example electronically controlled, then it presses the cup part (10) onto the valve body (2) via the play compensation element (15) so that the valve seat (4) counteracts the force of the compression spring (7). closes.
  • a high pressure for example 1000 bar, builds up in the pressure chamber (18) and opens the injection nozzle.
  • the locking force to be transmitted to the valve seat (4) is comparatively low, since the valve seat diameter (D2) and the guide diameter (D1) are essentially the same size.
  • valve body (2) moves under the action of the compression spring (7).
  • the opening effect is supported by the fact that the valve seat diameter (D2) is slightly smaller than the guide diameter (D1).

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)
EP89112156A 1988-07-20 1989-07-04 Dispositif de commande pour un injecteur de combustible Expired - Lifetime EP0351631B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824644 1988-07-20
DE3824644A DE3824644A1 (de) 1988-07-20 1988-07-20 Steuereinrichtung fuer eine kraftstoff-einspritzduese

Publications (2)

Publication Number Publication Date
EP0351631A1 true EP0351631A1 (fr) 1990-01-24
EP0351631B1 EP0351631B1 (fr) 1992-11-11

Family

ID=6359152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112156A Expired - Lifetime EP0351631B1 (fr) 1988-07-20 1989-07-04 Dispositif de commande pour un injecteur de combustible

Country Status (4)

Country Link
US (1) US5137256A (fr)
EP (1) EP0351631B1 (fr)
JP (1) JPH0267457A (fr)
DE (2) DE3824644A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8967591B2 (en) * 2011-02-24 2015-03-03 Wabtec Holding Corp. Trip cock fault detector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328853A1 (fr) * 1975-10-24 1977-05-20 Karl Marx Stadt Automobilbau Soupape electromagnetique d'injection pour moteurs a combustion interne avec une soupape a plusieurs voies commandee electromagnetiquement pour la charge et la decharge du cote arriere de l'aiguille d'injection
US4392612A (en) * 1982-02-19 1983-07-12 General Motors Corporation Electromagnetic unit fuel injector
GB2133479A (en) * 1983-01-12 1984-07-25 Gen Motors Corp Electromagnetic unit fuel injector
US4550875A (en) * 1984-08-06 1985-11-05 General Motors Corporation Electromagnetic unit fuel injector with piston assist solenoid actuated control valve
DE3704739A1 (de) * 1987-02-14 1988-06-09 Daimler Benz Ag Piezosteuerventil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633857A (en) * 1949-07-06 1953-04-07 Worthington Corp Governor steam control and emergency valve for steam turbines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328853A1 (fr) * 1975-10-24 1977-05-20 Karl Marx Stadt Automobilbau Soupape electromagnetique d'injection pour moteurs a combustion interne avec une soupape a plusieurs voies commandee electromagnetiquement pour la charge et la decharge du cote arriere de l'aiguille d'injection
US4392612A (en) * 1982-02-19 1983-07-12 General Motors Corporation Electromagnetic unit fuel injector
GB2133479A (en) * 1983-01-12 1984-07-25 Gen Motors Corp Electromagnetic unit fuel injector
US4550875A (en) * 1984-08-06 1985-11-05 General Motors Corporation Electromagnetic unit fuel injector with piston assist solenoid actuated control valve
DE3704739A1 (de) * 1987-02-14 1988-06-09 Daimler Benz Ag Piezosteuerventil

Also Published As

Publication number Publication date
US5137256A (en) 1992-08-11
DE3824644A1 (de) 1990-01-25
JPH0267457A (ja) 1990-03-07
DE58902666D1 (de) 1992-12-17
EP0351631B1 (fr) 1992-11-11

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