EP3385533A1 - Piezogesteuertes einlassventil - Google Patents

Piezogesteuertes einlassventil Download PDF

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Publication number
EP3385533A1
EP3385533A1 EP18165539.0A EP18165539A EP3385533A1 EP 3385533 A1 EP3385533 A1 EP 3385533A1 EP 18165539 A EP18165539 A EP 18165539A EP 3385533 A1 EP3385533 A1 EP 3385533A1
Authority
EP
European Patent Office
Prior art keywords
inlet valve
piezoceramic
pumping head
disc
head
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
EP18165539.0A
Other languages
English (en)
French (fr)
Other versions
EP3385533B1 (de
Inventor
Stephen Joseph MACLANE
Stephen Hutchins
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.)
Delphi Technologies IP Ltd
Original Assignee
Delphi Technologies IP Ltd
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 Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3385533A1 publication Critical patent/EP3385533A1/de
Application granted granted Critical
Publication of EP3385533B1 publication Critical patent/EP3385533B1/de
Active 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
    • 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
    • F02M59/367—Pump inlet valves of the check valve type being open when actuated
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the present invention relates to an inlet valve assembly of a high pressure fuel pump, said assembly having a piezo-controlled direct acting valve member.
  • a direct injection equipment comprises a high pressure pump in which fuel received from a low pressure tank is pressurised prior to be delivered to a common rail and to injectors.
  • the fuel in pressurised in a compression chamber which inlet is controlled by an inlet valve member that opens or closes under the influence of pressure difference between the upstream inlet conduit and said downstream compression chamber.
  • Digital inlet valve (DIV) are added to limit the fuel entry in the compression chamber to the necessary volume demanded to be pressurised by the engine.
  • a solenoid actuator may be added so that a magnetic armature cooperates with the valve member either to fully control the operation of the valve member or simply to speed-up the opening or to retard the closing, the valve member remaining generally passive.
  • Such electro-valve are structurally large, complex and difficult to pilot.
  • a pumping head of a fuel injection equipment high pressure pump comprising a body provided with a main bore extending along a main axis from a lower opening to an upper end partially defining a compression chamber wherein are arranged an outlet opening and an inlet opening forming an axial guiding bore extending through said body from a seat face surrounding the inlet opening in the bore to a top face of the body.
  • the pumping head further comprises an inlet valve assembly controlling said inlet opening an comprising an inlet valve body fixed atop the pumping head body thus defining an inner space, an inlet valve member having a head member defining a closing face cooperating with said seat face and, a stem member axially guided in said guiding bore and extending from said head member to an upper end protruding in said inner space and, a piezoceramic actuator fixed in said body and to said stem upper end.
  • an inlet valve assembly controlling said inlet opening an comprising an inlet valve body fixed atop the pumping head body thus defining an inner space, an inlet valve member having a head member defining a closing face cooperating with said seat face and, a stem member axially guided in said guiding bore and extending from said head member to an upper end protruding in said inner space and, a piezoceramic actuator fixed in said body and to said stem upper end.
  • said piezoceramic actuator is a disc-like member provided with a central orifice, the outer edge of said disc-like member being fixed in the inlet valve body and, the stem upper end being fixed into the central orifice.
  • the pumping head further comprises a stem upper end cap member arranged atop the stem upper end and inside the central orifice of the piezoceramic member. It also comprises a flexible sealing membrane arranged in the inlet body inner space and preventing, in use, fuel to contact the piezoceramic disc.
  • said membrane has an outer edge pinched between a face of the inlet valve body and the outer edge of the piezoceramic disc and, a central opening pinched between the stem upper end cap member and the piezoceramic disc.
  • the inlet valve body comprises an annular member fixed on the pumping head body and defining the peripheral wall of the inner space and, a valve body cap member fixed on said annular member and closing said inner space.
  • the disc membrane is arranged so its outer edge is against a top annular face of the annular member and the outer edge of said piezoceramic disc-like member, the valve body cap member covering the piezoceramic disc and being firmly tightened to the body annular member, thus pinching the piezoceramic disc and the membrane between the cover and the annular body member.
  • the pumping head further comprises electrical wires connected to the piezoceramic disc and extending outside the inlet valve body so that, in use, command signals may be sent from a command unit to said piezoceramic actuator.
  • the invention also extends to a high pressure fuel pump comprising a cambox and a pumping head as described above and wherein, in use, a camshaft rotates in the cambox imparting reciprocal displacements to a plunger guided in the main bore and varying the volume of the compression chamber.
  • a fuel injection equipment comprising a high pressure pump as here above mentioned and a command unit connected to the inlet valve piezoceramic disc and adapted to send command signal for operating the inlet valve member.
  • the invention also extends to a method of controlling such fuel injection equipment, the method comprising the step of:
  • figure 1 is an axial section of a pumping head of a HP pump as per the invention.
  • a fuel injection equipment comprises a high pressure pump 10 that receives fuel at low pressure, pressurises it and delivers it to a common rail.
  • the pump 10 has a pumping head 12 fixed on a cambox, not shown, the head 12 having a body 14 provided with a blind bore 16 which extends along a pumping axis X and in which, in use, reciprocates a plunger, not shown, that cooperates with a camshaft rotating in the cambox.
  • Said bore 16 is open at a lower end of the head 12 to enable the plunger to extend in the cambox and, at the upper blind end, said bore 16 partially defines a compression chamber 18 in which radially opens an outlet channel 20 controlled by an outlet check valve 22 and, axially opens an inlet valve guiding bore 24 controlled by an inlet valve assembly 26.
  • the inlet valve guiding bore 24 is coaxial to the bore 16 and it upwardly extends from a lower end opening in the blind end of the bore 16, said lower opening being surrounded by a seat face 28 defined on said end face of the bore to, an upper end opening on a top face 30 of the head body.
  • the pumping head top face 30 From said pumping head top face 30 upwardly protrudes a cylindrical wall 32 having a right-angled triangle wall section defining an cylindrical outer face 34 and, a frustoconical inner face 36 downwardly pointing toward the head body 14, said cylindrical wall 32 axially extending about the pumping axis X.
  • the pumping head top face 30 further comprises a conical member 38 axially upwardly protruding in the middle of said cylindrical wall 32, the inlet valve guiding bore 24 axially extending in said conical member 38 and opening at the top of it.
  • the pumping head body 14 is further provided with a fuel inlet channel 40 drilled in said conical member 38 and extending from the top face 30 of the pumping head, in an area close to the base of said conical member 38, to an annular chamber defined in the inlet valve guiding bore 24 above said seat face 28.
  • the inlet valve assembly 26 has a body 42 comprising a main member 44 and a cap member 46, said main member 44 having a base 48, fixed on the top face 30 of the pumping head body and, an annular tubular portion 50 axially protruding from said base 48 and adjusted onto the outer face 34 of the cylindrical wall. Said tubular portion 40 is covered by the cap member 46 having a transverse wall 52 closing the inlet body tubular portion 50 and a peripheral wall 54 internally threaded and complementary engaged and tightened onto a male thread provided on the outer face of the inlet body tubular portion 50.
  • the inlet valve body 42 and the top face 30 of the pumping head together define an inner space S in which opens the inlet valve guiding bore 24 and the fuel inlet channel 40.
  • Said inlet valve assembly 26 further comprises a poppet inlet valve member 56 having a stem 58 axially guided in the guiding bore 24 and extending between an upper end 60 protruding in the inner space S and a lower end protruding in the compression chamber 18, said lower end enlarging to form a head member 62 defining a closing face adapted to cooperate with the seat face 28 to seal said blind end of the bore.
  • the upper end 60 of the stem is covered by a cap member 64 defining a closed cylindrical portion 66 wherein said stem upper end 60 is inserted and, a crimping annular member 68 enabling to crimp said cap member 64 on the stem.
  • the stem upper end 60 covered by said closed portion 66 of the cap are inserted in an orifice 70 centrally provided in a disc-like piezoceramic member 72 that transversally extends parallel to the transverse wall 52 of the cap toward an outer circular edge 74 that is between said body cap member 46 and the inlet body tubular portion 50.
  • a sealing flexible membrane 76 adapted to prevent fuel contact to the piezoceramic disc 72 is arranged in the inner space S, lying against the under face of said disc member 72, the membrane 76 having a peripheral area sandwiched between the disc member 72 and the inlet body tubular portion 50. Centrally, the membrane 76 is holed and fixed to the crimping annular member 68.
  • the pumping head 12 and the inlet valve assembly 26 further comprise a fuel inlet conduit opening in the inner space S and enabling, in use, fuel to flow from a low pressure tank and to fill said inner space S and, electrical connection means, such as cables, wires and connectors, enabling to electrically connect said piezoceramic disc member 72 to an external command unit that will deliver relevant electrical command signals.
  • electrical connection means such as cables, wires and connectors, enabling to electrically connect said piezoceramic disc member 72 to an external command unit that will deliver relevant electrical command signals.
  • the piezoceramic disc 72 In a first step the piezoceramic disc 72 is not energised, it does not receive electrical signals, and it remains in a neutral planar position. In said neutral position the inlet valve member is upwardly pulled sealing the fluid communication between the inlet channel and the compression chamber 18.
  • the piezoceramic disc 72 is energized and, upon receiving such electrical signal, the disc deforms and centrally balloons, the outer edge 74 of the disc remaining pinched. As the disc 72 balloons, the disc central area downwardly moves pushing the inlet valve member 56 in an open position where the closing face of the head lifts away from the seat face 28 of the bore, enabling fuel passage in and out the compression chamber.
  • the opening and closing of the inlet is directly controlled, therefore, the inlet valve member can be opened or closed, earlier or later than it would naturally do under the sole influence of the pressure differences in the inner space S and in the compression chamber 18, this to optimise the filling of the compression chamber to the necessary quantity demanded by an engine.

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)
EP18165539.0A 2017-04-04 2018-04-03 Piezogesteuertes einlassventil Active EP3385533B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1705399.2A GB2561189A (en) 2017-04-04 2017-04-04 Piezo controlled inlet valve

Publications (2)

Publication Number Publication Date
EP3385533A1 true EP3385533A1 (de) 2018-10-10
EP3385533B1 EP3385533B1 (de) 2020-07-29

Family

ID=58682590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18165539.0A Active EP3385533B1 (de) 2017-04-04 2018-04-03 Piezogesteuertes einlassventil

Country Status (2)

Country Link
EP (1) EP3385533B1 (de)
GB (1) GB2561189A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008018018A1 (de) * 2008-04-09 2009-10-15 Continental Automotive Gmbh Pumpe zur Förderung eines Fluids
DE102012210087A1 (de) * 2012-06-15 2013-12-19 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung, und Kraftstoffeinspritzeinrichtung
DE102012218552A1 (de) * 2012-10-11 2014-04-17 Continental Automotive Gmbh Pumpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1296061A3 (de) * 2001-09-21 2005-03-16 Hitachi, Ltd. Hochdruckkraftstoffpumpe
HUE025798T2 (en) * 2012-07-19 2016-05-30 Delphi Int Operations Luxembourg Sarl valve Layout
DE102012217032A1 (de) * 2012-09-21 2014-04-17 Robert Bosch Gmbh Hochdruckpumpe, insbesondere für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008018018A1 (de) * 2008-04-09 2009-10-15 Continental Automotive Gmbh Pumpe zur Förderung eines Fluids
DE102012210087A1 (de) * 2012-06-15 2013-12-19 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung, und Kraftstoffeinspritzeinrichtung
DE102012218552A1 (de) * 2012-10-11 2014-04-17 Continental Automotive Gmbh Pumpe

Also Published As

Publication number Publication date
EP3385533B1 (de) 2020-07-29
GB2561189A (en) 2018-10-10
GB201705399D0 (en) 2017-05-17
GB2561189A8 (en) 2018-11-28

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