EP0703363B1 - Dispositif d'injection de combustible - Google Patents

Dispositif d'injection de combustible Download PDF

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Publication number
EP0703363B1
EP0703363B1 EP19950306276 EP95306276A EP0703363B1 EP 0703363 B1 EP0703363 B1 EP 0703363B1 EP 19950306276 EP19950306276 EP 19950306276 EP 95306276 A EP95306276 A EP 95306276A EP 0703363 B1 EP0703363 B1 EP 0703363B1
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EP
European Patent Office
Prior art keywords
piezoelectric device
electrode plate
earth plate
fuel injection
nozzle
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 - Lifetime
Application number
EP19950306276
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German (de)
English (en)
Other versions
EP0703363A2 (fr
EP0703363A3 (fr
Inventor
Toshiki c/o Higashimatsuyama Fact. of Sawaki
Akira c/o Higashimatsuyama Fact. of Unozawa
Kazuhisa c/o Higashimatsuyama Fact. of Kasukawa
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.)
Bosch Corp
Original Assignee
Zexel Corp
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Filing date
Publication date
Application filed by Zexel Corp filed Critical Zexel Corp
Publication of EP0703363A2 publication Critical patent/EP0703363A2/fr
Publication of EP0703363A3 publication Critical patent/EP0703363A3/fr
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Publication of EP0703363B1 publication Critical patent/EP0703363B1/fr
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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors

Definitions

  • This invention relates to a fuel injection device capable of detecting a fuel injection time (time point for injecting a fuel) using a piezoelectric device.
  • the fuel injection device includes a body, a needle valve axially slidably received in the body, and a nozzle spring for biasing the needle valve toward a valve seat formed on a lower end portion of the body.
  • a nozzle port is closed during the time the needle valve sits on the valve seat and opened to allow a fuel to be injected therethrough when the needle valve lifts from the valve seat.
  • This means for detecting a fuel injection time includes a piezoelectric device, and an electrode plate and an earth plate which plates are in contact with opposite end faces of the piezoelectric device, respectively.
  • the piezoelectric device and the plates are disposed in an axial direction of the body.
  • the nozzle spring When the needle valve lifts from the valve seat, the nozzle spring is compressed to increase its force for pressing the piezoelectric device. Consequently, an output voltage of the piezoelectric device is increased. The output voltage thus increased is served as a signal for detecting a fuel injection time.
  • the detection means is received in an upper end portion (an end portion away from the valve seat and nozzle port) of a spring receiving hole formed in a body.
  • a nozzle spring is received in the spring receiving hole and interposed between the detection means and the needle valve.
  • an electrode plate, a piezoelectric device, and an earth plate are arranged in order toward the valve seat.
  • the body has a receiving surface disposed at an upper end of the spring receiving hole.
  • An insulating member is interposed between the receiving surface and the electrode plate. Owing to this arrangement, an electrically-insulated state is maintained between the electrode plate and the body.
  • the earth plate is provided with a plurality of tongue pieces radially outwardly projecting from a peripheral edge area thereof. With the tongue pieces slantwise bent, the earth plate is press fitted into the spring receiving hole. The tongue pieces are resiliently contacted with an inner peripheral surface of the spring receiving hole to thereby achieve an electrical connection between the earth plate and the body.
  • an electrode plate, a piezoelectric device and an earth plate are likewise arranged in order toward a valve seat as in the case with the detection means of the above-mentioned patent publication.
  • An insulating member is interposed between the electrode plate and a receiving surface disposed at an upper end of a spring receiving hole.
  • a sleeve portion is formed on a peripheral edge of the earth plate. This sleeve portion contacts an inner peripheral surface of the receiving hole to thereby achieve an electrical connection between the earth plate and the body.
  • an object of the present invention to provide a fuel injection device which is easy to manufacture and easy to assemble and which is capable of detecting a fuel injection time with a high degree of precision.
  • a fuel injection device comprising:
  • US-A-4 662 564 describes a fuel injection device having the features set forth in the preamble of claim 1 herein.
  • a fuel injection device comprises an elongated body 10 which is to be attached to a cylinder head of an engine (not shown).
  • the body 10 includes a nozzle holder 11, a spacer 12, and a nozzle 13, all arranged in order downwardly along an axis of the body.
  • the body 10 further includes a nozzle nut 14 for securing the spacer 12 and nozzle 13 to the nozzle holder 11.
  • the nozzle holder 11 has a spring receiving hole 15 extending axially of the body 10, a vertical hole 16a communicating with an upper end of the spring receiving hole 15 and extending axially of the body 10, and a horizontal hole 16b extending from an upper end of the vertical hole 16a in a perpendicular direction to the axis of the body 10 and opening at an outer peripheral surface of the nozzle holder 11.
  • the spring receiving hole 15 is opened at a lower end face of the nozzle holder 11.
  • the vertical hole 16a is smaller in diameter than the spring receiving hole 15.
  • a conical receiving surface 15a is formed at a boundary area between the vertical hole 16a and the spring receiving hole 15 (i.e., at an upper end of the spring receiving hole 15).
  • the nozzle 13 is provided with a valve receiving hole 17 extending axially of the body 10.
  • a lower end portion of the valve receiving hole 17 is defined by a pressure receiving chamber 17a.
  • a valve seat 18 and a nozzle port 19 are formed in order downwardly at a lower end portion of the nozzle 13.
  • the valve receiving hole 17, the valve seat 18 and the nozzle port 19 are arranged on the axis of the body 10.
  • the body 10 has a high pressure passage 20 extending through the nozzle hole 11, the spacer 12 and the nozzle 13.
  • An upper end of the high pressure passage 20 is opened at an upper end face of the nozzle holder 11, and a high pressure fuel is supplied to this opening.
  • a lower end of the high pressure passage 20 is in communication with the pressure receiving chamber 17a.
  • a needle valve 21 is axially slidably received in the valve receiving hole 17 of the nozzle 13.
  • a compressed nozzle spring 22 is received in the spring receiving hole 15. The nozzle spring 22 biases the needle valve 21 toward the valve seat 18.
  • the nozzle port 19 is in a closed state.
  • a high pressure fuel is supplied from a fuel injection pump (not shown) to the high pressure passage 20
  • the needle valve 21 receives the fuel pressure in the pressure receiving chamber 17a and is lifted from the valve seat 18.
  • the nozzle port 19 is opened to allow the high pressure fuel to be injected to a combustion chamber of the engine therethrough.
  • the needle valve 21 is caused to sit on the valve seat 18 under the effect of the nozzle spring 22 and thus the fuel injection is finished.
  • a detection assembly 30 (detection means) for detecting a fuel injection time is received in the upper end portion of the spring receiving hole 15.
  • the detection assembly 30 is particularly clearly shown in Fig. 2.
  • the nozzle spring 22 presses the detection assembly 30 upwardly through a shim 35.
  • the detection assembly 30 includes an earth plate 31, a piezoelectric device 32, and an electrode plate 33, all arranged in order downwardly. This sequential order of arrangement is reverse to that of the previously described conventional device.
  • a surface of the piezoelectric device 32 on the positive electrode side faces downwardly.
  • the electrode plate 33 is secured to this surface by electrically-conductive adhesive agent (not shown).
  • a surface of the piezoelectric device 32 on the negative electrode side faces upwardly.
  • the earth plate 31 is secured to this surface by electrically-conductive adhesive agent.
  • An acceptable adhesive agent includes those of silver powder compounded epoxy resins, for example.
  • the earth plate 31 has a through-hole 31x formed in the center thereof.
  • the earth plate 31 has a thick circular ring shape.
  • a conical abutment surface 31a having an angle equal to that of the receiving surface 15a of the upper end of the spring receiving hole 15 is formed on an upper surface of the earth plate 31.
  • the receiving surface 15a and the abutment surface 31a are in surface contact with each other under the effect of the nozzle spring 22.
  • the piezoelectric device 32 also has a through-hole 32x formed in the center thereof.
  • the piezoelectric device 32 has a circular ring shape.
  • the electrode plate 33 has a disk-like shape.
  • a rod portion 33a extending upwardly and axially of the body 10 is formed on the center of the electrode plate 33.
  • the rod portion 33a is inserted into the through-hole 32x of the piezoelectric device 32, the through-hole 31x of the earth plate 31 and the vertical hole 16a of the nozzle holder 11.
  • An upper end of the rod portion 33a is disposed at a crossing portion between the vertical hole 16a and the horizontal hole 16b.
  • the detection assembly 30 is formed as a unitary part by enclosing the earth plate 31, the piezoelectric device 32 and the electrode plate 33 with an insulating member 34.
  • the insulating member 34 is constituted of a glass fiber reinforced PA (polyamide) 66, a glass fiber reinforced PPS (polyphenylene sulphide), or the like.
  • PA polyamide
  • PPS polyphenylene sulphide
  • the earth plate 31, the piezoelectric device 32 and the electrode plate 33 which were preliminarily fixed by electrically-conductive adhesive agent, are set in a metal mold and then the insulating resin is injected into the metal mold.
  • the insulating member 34 includes a disk portion 34a covering a lower surface of the electrode plate 33, and a sleeve portion 34b covering outer peripheral surfaces of the earth plate 31, piezoelectric device 32 and electrode plate 33.
  • the disk portion 34a of the insulating member 34 insulates the electrode plate 33 from the shim 35 and the nozzle spring 22, whereas the sleeve portion 34b insulates the piezoelectric device 32 and the electrode plate 33 from the inner peripheral surface of the spring receiving hole 15.
  • a support 40 is secured to the outer peripheral surface of the nozzle holder 11 where the horizontal hole 16b is opened.
  • the support 40 is provided with a connector 41 received in the horizontal hole 16b.
  • a terminal 42 disposed on a distal end of the connector 41 is electrically connected to the upper end portion of the rod portion 33a of the electrode portion 33.
  • the terminal 42 is constituted of a U-shaped metal plate.
  • the rod portion 33a of the electrode plate 33 is held by the U-shaped terminal 42 so as to be connected to the terminal 42.
  • An interface for a micro computer (not shown) for controlling a fuel injection pump is connected to the electrode plate 33 through the connector 41 and also connected to an earth terminal, not shown, secured to the nozzle holder 11.
  • the detection assembly 30 thus constructed, when the needle valve 21 is lifted, the pressing force of the nozzle spring 22 applied to the piezoelectric device 32 is increased because the nozzle spring 22 is compressed. As a consequence, voltage generated in the piezoelectric device 32 is increased.
  • This voltage signal is processed by the interface and input into the micro computer.
  • the micro computer controls the fuel injection pump in accordance with a signal indicative of a fuel injection time.
  • the earth plate 31 since the earth plate 31 is caused to contact the receiving surface 15a of the nozzle holder 11 by the nozzle spring 22, the earth plate 31 can be positively electrically connected to the nozzle holder 11.
  • the pressing force of the nozzle spring 22 acts directly on the piezoelectric device 32. Consequently, accuracy of detection of the piezoelectric device 32 can be increased. It should be noted that since the Young modulus of the insulating member 34 is considerably smaller than that of the piezoelectric device 32, the force of the nozzle spring 22 is hardly applied to the sleeve portion 34b of the insulating member 34 but it is substantially applied to the piezoelectric device 32 alone.
  • the detection assembly 30 can be assembled to the nozzle holder 11 with ease.
  • the receiving surface 15a of the nozzle holder 11 and the abutment surface 31a of the earth plate 31 are conical surfaces, and surface contact therebetween prevents the nozzle holder 11 from moving radially.
  • the detection assembly 30 can be positively held in a predetermined position. Since it is no more required for the insulating member 34 to have the role for prohibiting the detection assembly 30 from moving radially, it becomes possible to provide a clearance A (see Fig. 2) between the outer peripheral surface of the sleeve portion 34b and the inner peripheral surface of the spring receiving hole 15. Owing to this arrangement, the insulating member 34, when rotated by the force of the nozzle spring 22, does not rub the inner peripheral surface of the spring receiving hole 15 and therefore, wear of the insulating member 34 can be prevented.
  • the force of the nozzle spring can be dispersed over the entire area of the two surfaces of the piezoelectric device 32 because an electrically-conductive adhesive agent is interposed between the opposing surfaces as previously mentioned. For this reason, the piezoelectric device 32 can be prevented from cracking by great force locally applied thereto.
  • an insulating material such as resin may be filled in the annular gap formed between the rod portion 33a of the electrode plate 33 and the inner peripheral surfaces of the earth plate 31 and piezoelectric device 32. Owing to this arrangement, there can be prevented a possible deterioration of insulating ability caused by dusts, etc. entered into the annular gap.

Claims (6)

  1. Dispositif d'injection de combustible comprenant :
    (a) un corps allongé (10) ayant un trou de réception de ressort (15) et un trou de réception de soupape (17) placés dans l'ordre vers son extrémité distale et s'étendant axialement audit corps, ledit corps ayant en outre un orifice d'injecteur (19) placé à la partie d'extrémité distale et un siège de soupape (18) communiquant avec ledit orifice d'injecteur, ledit corps ayant en outre une surface de réception (15a) placée à une extrémité de base dudit trou de réception de ressort (15);
    (b) une soupape à pointeau (21) logée axialement de manière coulissante dans ledit trou de réception de soupape dudit corps, ledit orifice d'injecteur étant dans un état fermé lorsque ladite soupape à pointeau est placée sur ledit siège de soupape, ledit orifice d'injecteur étant ouvert pour permettre au combustible d'être injecté au travers lorsque ladite soupape à pointeau est soulevée dudit siège de soupape;
    (c) un ressort d'injecteur (22) logé dans ledit trou de réception de ressort dudit corps et adapté pour orienter ladite soupape à pointeau vers ledit siège de soupape; et
    (d) un moyen de détection (30) logé dans la partie de base dudit trou de réception de ressort et adapté pour détecter un temps d'injection de combustible en détectant une force accrue dudit ressort d'injecteur, la force s'accroissant en fonction du soulèvement de ladite soupape à pointeau, ledit moyen de détection ayant un dispositif piézo-électrique (32), une plaque à électrode (33) et une plaque de masse (31), ladite plaque à électrode et ladite plaque de masse étant respectivement en contact avec des faces d'extrémité axialement opposées dudit dispositif piézo-électrique;
    dans lequel ladite plaque à électrode (33) est placée entre ledit dispositif piézo-électrique (32) et ledit ressort d'injecteur (22), et ladite plaque de masse (31) est placée entre ledit dispositif piézo-électrique (32) et ladite surface de réception (15a) dudit corps (10), ladite plaque de masse étant mise en butée contre ladite surface de réception (15a) dudit corps (10), réalisant ainsi un contact électrique avec ledit corps;
    caractérisé en ce que ledit dispositif piézo-électrique (32) et ladite plaque de masse (31) ont respectivement des configurations en forme d'anneau, et ladite plaque à électrode (33) a une configuration en forme de disque, une partie de tige (33a) étant formée au centre de ladite plaque à électrode, ladite partie de tige s'étendant axialement dudit corps (10) à travers ledit dispositif piézo-électrique et ladite plaque de masse afin d'être en contact avec un connecteur (41) supporté par ledit corps, un intervalle annulaire étant formé entre ladite partie de tige et à la fois ladite plaque de masse et ledit dispositif piézo-électrique.
  2. Dispositif d'injection de combustible selon la revendication 1, dans lequel un matériau isolant est introduit dans ledit intervalle annulaire.
  3. Dispositif d'injection de combustible selon la revendication 1 ou 2, dans lequel ladite surface de réception (15a) dudit corps (10) est une surface conique, et ladite plaque de masse (31) a une surface d'appui conique (31a) qui peut être mise en contact de surface avec ladite surface de réception.
  4. Dispositif d'injection de combustible selon l'une quelconque des revendications 1 à 3, dans lequel ladite plaque de masse (31), le dispositif piézo-électrique (32) et la plaque à électrode (33) sont attachés entre eux par un agent adhésif électriquement conducteur.
  5. Dispositif d'injection de combustible selon l'une quelconque des revendications 1 à 4, dans lequel ladite plaque de masse (31), le dispositif piézo-électrique (32) et la plaque à électrode (33) sont contenus dans un élément isolant (34), ledit élément isolant couvrant une surface de ladite plaque à électrode du côté dudit ressort d'injecteur (22) et couvrant également des surfaces périphériques de ladite plaque à électrode et du dispositif piézo-électrique.
  6. Dispositif d'injection de combustible selon la revendication 5, dans lequel ledit élément isolant (34) est en résine moulée, intégrant ainsi ladite plaque de masse (31), le dispositif piézo-électrique (32) et la plaque à électrode (33).
EP19950306276 1994-09-21 1995-09-07 Dispositif d'injection de combustible Expired - Lifetime EP0703363B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP251599/94 1994-09-21
JP25159994A JP3274294B2 (ja) 1994-09-21 1994-09-21 燃料噴射装置の噴射時期検出装置
JP25159994 1994-09-21

Publications (3)

Publication Number Publication Date
EP0703363A2 EP0703363A2 (fr) 1996-03-27
EP0703363A3 EP0703363A3 (fr) 1996-12-18
EP0703363B1 true EP0703363B1 (fr) 1999-12-01

Family

ID=17225221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950306276 Expired - Lifetime EP0703363B1 (fr) 1994-09-21 1995-09-07 Dispositif d'injection de combustible

Country Status (4)

Country Link
EP (1) EP0703363B1 (fr)
JP (1) JP3274294B2 (fr)
KR (1) KR0168982B1 (fr)
DE (1) DE69513604T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10228353A1 (de) * 2002-06-25 2004-01-15 Daimlerchrysler Ag Piezo-Sensors-System zur Detektion des Nadelhubs einer Einspritzdüse eines Common-Rail-Injektors
DE102007008617A1 (de) * 2007-02-22 2008-08-28 Robert Bosch Gmbh Injektor mit Sensormodul sowie Einspritzsystem
EP2402670B1 (fr) 2009-01-19 2019-08-07 Hochiki Corporation Installation de refroidissement par pulvérisation et procédé de pulvérisation
DE102013225386A1 (de) * 2013-12-10 2015-06-11 Robert Bosch Gmbh Sensoreinrichtung zur Kraft- oder Druckerfassung, Verfahren zum Herstellen einer Sensoreinrichtung und Kraftstoffinjektor mit einer Sensoreinrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56113044A (en) * 1980-02-13 1981-09-05 Nissan Motor Co Ltd Injection timing sensor
US4662564A (en) * 1984-05-15 1987-05-05 Diesel Kiki Co., Ltd. Fuel injection nozzle with timing sensor
JPS6314188A (ja) 1986-07-05 1988-01-21 日立電子エンジニアリング株式会社 情報投影装置
JPH0447163A (ja) 1990-06-13 1992-02-17 Mitsubishi Electric Corp 機関の補助空気制御装置

Also Published As

Publication number Publication date
DE69513604D1 (de) 2000-01-05
DE69513604T2 (de) 2000-07-13
JPH0893602A (ja) 1996-04-09
EP0703363A2 (fr) 1996-03-27
EP0703363A3 (fr) 1996-12-18
JP3274294B2 (ja) 2002-04-15
KR0168982B1 (ko) 1999-01-15

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