EP1715177B1 - Piezoelectric actuator for the operation of an injection pump for internal-combustion engines, and injector-pump assembly employing said actuator - Google Patents

Piezoelectric actuator for the operation of an injection pump for internal-combustion engines, and injector-pump assembly employing said actuator Download PDF

Info

Publication number
EP1715177B1
EP1715177B1 EP20060112774 EP06112774A EP1715177B1 EP 1715177 B1 EP1715177 B1 EP 1715177B1 EP 20060112774 EP20060112774 EP 20060112774 EP 06112774 A EP06112774 A EP 06112774A EP 1715177 B1 EP1715177 B1 EP 1715177B1
Authority
EP
European Patent Office
Prior art keywords
actuator
rigidity
spring
piezoelectric
combustion engines
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.)
Expired - Fee Related
Application number
EP20060112774
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1715177A1 (en
Inventor
Pierluigi Dell'orto
Pasquale Grassia
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.)
Dell Orto SpA
Original Assignee
Dell Orto SpA
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 Dell Orto SpA filed Critical Dell Orto SpA
Publication of EP1715177A1 publication Critical patent/EP1715177A1/en
Application granted granted Critical
Publication of EP1715177B1 publication Critical patent/EP1715177B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • 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 falls in the sector of fuel supply systems in internal combustion engines. More in particular, the present invention refers to a piezoelectric actuator for the operation of an injection pump of internal combustion engines and to the injector-pump assembly employing said actuator.
  • the present invention proposes to identify an injection system alternative to the ones already proposed, based on an actuator of a piezoelectric type, and such as to allow increased injectable flow rates per cycle, over known systems, given equal dimensions of the actuator and an improved reaction to high operation rpm. It is here reminded that three pump-injector systems are compared in the known art: with an actuator acting on a centrally-loaded membrane, or acting on an annular-load membrane, or piston pump-actuator systems.
  • the object of the present invention is hence to obtain an improvement of the performance of a piston pump-injector system with piezoelectric actuator, essentially by adopting means capable of amplifying the useful run of the piezoelectric actuator.
  • a piezoelectric actuator has a linearly decreasing load/deformation feature. That is to say, at a set supply voltage (phantom lines for 0 V., for 80 V. and for 160 V., respectively), this type of actuator is capable of developing large loads with small piston displacements, but loses its thrust capability as the run increases, down to zero thrust when the maximum idle displacement is reached.
  • the actual feature of the piezoelectric actuator does not perfectly suit the application thereof as a hydraulic pumping element, because the latter one requires the exertion of a constant force throughout the entire compression run. Instead, it has not been possible yet to use the full nominal run of the piezoelectric element, because, as seen with respect to the diagram of fig. 2 , in the final part of the run the loading capability necessary to overcome fluid pressure would not be provided.
  • the piezoelectric actuator cannot exert a force which remains constant throughout the entire work run ⁇ L o , it is provided, according to a first aspect of the present invention, to adopt a compromise between run and load, making use of a part only of the actual total work run. In other words, it is provided to use the piezoelectric element with an average run and an average load. It is possible to prove that this is the best solution, i.e. the one which allows to obtain the maximum work per cycle; as a matter of fact, in such solution the largest quantity of energy is delivered between the one available per work cycle.
  • the piezoelectric material of which commercial actuators are made further has the feature - common to all ceramic materials - of displaying an asymmetric mechanical behaviour in the presence of tensile and compressive stresses; in particular, tensile behaviour is poor, whereas the compressive one is acceptable for applications as actuator, both in static and in dynamic conditions.
  • a preload (assumed to be rigidly constant) does not affect the performance of the actuator, determining only a translation of the work cycle in the plane of fig. 2 , i.e. bringing the work cycle inside the positive half-plane (compressive stress) of the load; thereby, a safety margin is accomplished which serves to safeguard the piezoelectric element from the dynamic tensile actions which are generated during fast operation and which must be neutralised precisely by the presence of the preload.
  • a negative-rigidity spring i.e. a spring supplying a decreasing preload as deformation increases.
  • An actuator deficiency is thereby countered by the special feature of the spring, i.e. the capability of providing high loads only at the beginning of the run.
  • the embodiment comprising springs having a negative rigidity of -9.5 N/ ⁇ m, although theoretically possible, is of no practical usefulness.
  • the diagram gradient of fig. 2 albeit limited to the middle portion where the derivative takes up the absolute minimum value, it would be necessary to resort to diameters of 800 mm with thicknesses of 20 mm.
  • These dimensions are evidently not admissible for use in internal combustion engines, in particular those intended for motor bicycles. The problem has therefore arisen of how to manufacture a spring featuring maximum negative rigidity with the smallest dimensions.
  • a spring capable of providing maximum negative rigidity with respect to material resistance, having dimensions compatible with its application in internal combustion engines.
  • the rigidity thus obtained for the spring dimensioned as above is then doubled with two springs arranged packetwise and further amplified arranging in series a conventional spring with a rigidity of 1,15 N/ ⁇ m.
  • a piezoelectric pump-injector particularly suited to small-powered internal combustion engines - having for example a swept volume of 50 cm 3 - can be manufactured, according to the present invention, also employing a small, inexpensive piezoelectric element such as the Epcos one (table of fig. 1 ), in association with a preload spring having a negative rigidity whose modulus is about half that of the piezoelectric element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20060112774 2005-04-21 2006-04-19 Piezoelectric actuator for the operation of an injection pump for internal-combustion engines, and injector-pump assembly employing said actuator Expired - Fee Related EP1715177B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20050719 ITMI20050719A1 (it) 2005-04-21 2005-04-21 Attuatore piezoelettrico per l'azionamento di una pompa d'iniezione per motori a combustione interna e complesso iniettore-pompa con esso realizzato

Publications (2)

Publication Number Publication Date
EP1715177A1 EP1715177A1 (en) 2006-10-25
EP1715177B1 true EP1715177B1 (en) 2009-07-15

Family

ID=35811730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060112774 Expired - Fee Related EP1715177B1 (en) 2005-04-21 2006-04-19 Piezoelectric actuator for the operation of an injection pump for internal-combustion engines, and injector-pump assembly employing said actuator

Country Status (3)

Country Link
EP (1) EP1715177B1 (it)
DE (1) DE602006007746D1 (it)
IT (1) ITMI20050719A1 (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007030043A1 (de) 2007-06-26 2009-01-02 Stefan Barten Piezoelektrisch angetriebene Dosierpumpe
CN101216027B (zh) * 2008-01-11 2010-08-18 吉林大学 压电叠堆泵
EP2450558A1 (en) * 2010-11-03 2012-05-09 Continental Automotive GmbH Injection valve
EP2495428A1 (en) * 2011-03-04 2012-09-05 Continental Automotive GmbH Apparatus for delivering fuel and fuel supply system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60233363A (ja) * 1984-05-03 1985-11-20 Nippon Soken Inc 燃料噴射弁
DE19619319A1 (de) * 1996-05-14 1997-11-20 Ruediger Ufermann Piezoelektrische-Kraftstoff- Einspritzvorrichtung
DE19712921A1 (de) * 1997-03-27 1998-10-01 Bosch Gmbh Robert Brennstoffeinspritzventil mit piezoelektrischem oder magnetostriktivem Aktor
JPH11182446A (ja) * 1997-12-24 1999-07-06 Nissan Motor Co Ltd ポンプ
DE19827293A1 (de) * 1998-06-19 1999-12-23 Ruediger Ufermann Elektrohydraulisches Pump- und Antriebselement mit kurzem Piezo-Aktor
DE10248433B4 (de) * 2002-10-17 2015-01-15 Cummins Ltd. Vorrichtung zum Fördern von Medien, insbesondere Einspritzvorrichtung für Brennkraftmaschinen von Kraftfahrzeugen
WO2004040122A1 (ja) * 2002-10-29 2004-05-13 Bosch Automotive Systems Corporation 大流量燃料用バルブおよびそれを備えた燃料供給用ポンプ

Also Published As

Publication number Publication date
DE602006007746D1 (de) 2009-08-27
EP1715177A1 (en) 2006-10-25
ITMI20050719A1 (it) 2006-10-22

Similar Documents

Publication Publication Date Title
DE112010001987T5 (de) Piezoelektrische direkt wirkende Kraftstoff-E inspritzdüse mit Hydraulikverbindung
US7665445B2 (en) Motion coupler for a piezoelectric actuator
EP1715177B1 (en) Piezoelectric actuator for the operation of an injection pump for internal-combustion engines, and injector-pump assembly employing said actuator
JPS63207185A (ja) 圧電アクチユエ−タ
US7506825B2 (en) Fuel injector control system
CN1488035A (zh) 燃料喷射阀
US6805302B2 (en) Injector for controlling fluids
US20120305666A1 (en) High Pressure Piezoelectric Fuel Injector
CN1511228A (zh) 带有一复合阀针的直接启动式喷射阀
US7699242B2 (en) Injector
US7931211B2 (en) Injector
US6491027B1 (en) Method of driving a capacitive actuator of a fuel injection valve of an internal combustion engine
US8100349B2 (en) Fuel injection device
JP4304895B2 (ja) 油圧制御弁および燃料噴射弁
US7644875B2 (en) Injector
DE102004001505B4 (de) Dosierventil mit Längenkompensationseinheit
EP1431568A2 (de) Brennstoffeinspritzventil
JP2010019147A (ja) 燃料噴射弁
JP4364864B2 (ja) 可変噴孔インジェクタ
EP1452729B1 (de) Brennstoffeinspritzventil
JP4889156B2 (ja) アクチュエータ及び噴射装置
Anzinger et al. A Piezoelectric Driven Microinjector for Dl-Gasoline Applications
JPS62248851A (ja) 燃料噴射弁用電歪式アクチユエ−タの駆動回路
JP4378877B2 (ja) 油圧制御弁および燃料噴射弁
JP6443109B2 (ja) 燃料噴射弁

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20070410

17Q First examination report despatched

Effective date: 20070514

AKX Designation fees paid

Designated state(s): DE FR IT

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR IT

REF Corresponds to:

Ref document number: 602006007746

Country of ref document: DE

Date of ref document: 20090827

Kind code of ref document: P

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20100416

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20101020

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20101021

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20111115

Year of fee payment: 6

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20121228

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602006007746

Country of ref document: DE

Effective date: 20121101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120419

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121101