EP0158739A2 - Dispositif destiné à l'injection du combustible dans les chambres de combustion - Google Patents

Dispositif destiné à l'injection du combustible dans les chambres de combustion Download PDF

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Publication number
EP0158739A2
EP0158739A2 EP84116262A EP84116262A EP0158739A2 EP 0158739 A2 EP0158739 A2 EP 0158739A2 EP 84116262 A EP84116262 A EP 84116262A EP 84116262 A EP84116262 A EP 84116262A EP 0158739 A2 EP0158739 A2 EP 0158739A2
Authority
EP
European Patent Office
Prior art keywords
combustion chambers
injecting fuel
chambers according
fuel
central region
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
EP84116262A
Other languages
German (de)
English (en)
Other versions
EP0158739A3 (en
EP0158739B1 (fr
Inventor
Werner Dr. Dipl.-Phys. Grünwald
Ernst Imhof
Iwan Komaroff
Rolf Dipl.-Ing. Mayer
Günther Schmid
Helmut Reum
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0158739A2 publication Critical patent/EP0158739A2/fr
Publication of EP0158739A3 publication Critical patent/EP0158739A3/de
Application granted granted Critical
Publication of EP0158739B1 publication Critical patent/EP0158739B1/fr
Expired 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines

Definitions

  • the invention relates to a device for injecting fuel into combustion chambers according to the preamble of the main claim.
  • a known device of this type DE-PS 834 467
  • the heating coil of a glow plug encloses the fuel jet emerging from an injection nozzle.
  • fresh air is blown out of the cylinder perpendicularly to the injected jet at one point on the injection channel, asymmetrically.
  • Fuel parts that were previously heated up are transported accelerated into the cylinder.
  • There is no optimal combustion which is disadvantageous in terms of efficiency and exhaust gas composition.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the heating element meets the different requirements of short heating-up time and good quality of annealing.
  • An advantageous embodiment of the invention results from the fact that the temperature of the heating element is higher in its central region than in its outer regions. The middle, much hotter area enables short heating-up times and, due to the higher temperature difference to the fuel jet flowing in the air jacket, better heat transfer.
  • the heating element heats the fuel jet without contact.
  • the intense infrared radiation heats up the fuel droplets of the air-fuel swirling, while the air is heated by convection where it flows past the heating element.
  • the fuel-air mixture is thus effectively preheated for its easy flammability without the heating element coming into contact with fuel.
  • the mechanical holder is located in the areas where the heating element has a lower temperature. This bracket is much more reliable at lower temperatures.
  • the heating element is designed as a resistance heating element through which electric current flows, the heating resistance of which is higher in its central region than in FIG outer areas.
  • a temperature profile desired on the heating element can thus be designed very precisely.
  • a resistance heating element must be contacted in a very reliable manner, which is easy to control in the areas with a lower temperature, without having to forego the advantages of good heat transfer and a short heating-up time.
  • the resistance heating element is designed as a cylindrical incandescent body which can be contacted on its two end faces. It may be favorable that the diameter of the cylindrical filament is increased towards the end faces.
  • the incandescent body can be the carrier of the heating resistor and provide the necessary mechanical strength.
  • the larger diameter of the end faces enables a larger electrically effective cross section and a particularly reliable contact.
  • the heating resistor is advantageously supplied with feed current in that contacting disks are attached to the end faces of the incandescent body by means of suitable solders.
  • the incandescent body is designed at least in its central region as a helical heating resistor, the resistance coils of which have a smaller cross section in its central region than in its outer regions. This feature makes it easy to determine the temperature profile over the cross section of the resistance coil, because the electrical resistance per unit length of the helical heating resistor causes the electrical heating power generated.
  • the helical heating resistor consists of the material molybdenum disilicide (MoSi 2 ).
  • MoSi 2 molybdenum disilicide
  • the helical heating resistor is made of the material M O Si 2 , and 'milled out of a tube of this material, it can be advantageous to improve the mechanical strength that support means are present between at least a few turns of the helical heating resistor in the manner of webs.
  • These support means can consist of axially attached layers of electrically insulating ceramic paste, so that the advantages of the desired temperature profile of the incandescent body can be combined with the advantages of the resistance material MoSi 2 .
  • An advantage of the M O Si 2 is that it has a so-called PTC effect (increase in resistance when the temperature rises), so that the heating-up times are very short, and that the electrical power consumed automatically adapts to changing load conditions without an external control device.
  • a mecha nisch particularly stable incandescent body is characterized in that an electrically insulating cylinder is present as a support means, which includes the helical heating resistor.
  • the cylindrical incandescent body has holes in the manner of a perforation on its outer surface and that the density of the holes is higher in its central regions than in its outer regions.
  • the perforation may be present only in central regions of the cylindrical incandescent body.
  • a structure equivalent to the perforation can also be achieved in that the cylindrical incandescent body is at least partially constructed in the manner of a cell structure, the effective electrical resistance in the central region, due to the cell structure, being higher than in the outer regions.
  • FIG. 1 shows an embodiment of the device according to the invention on an injection nozzle.
  • Fig. 2 shows a helical heating resistor which is designed as a cylindrical incandescent body.
  • Fig. 3 shows a helical heating resistor with contacting washers.
  • FIG. 4 shows two configurations of the incandescent body and
  • FIG. 5 shows an exemplary embodiment with a incandescent body which is enclosed by a ceramic protective tube.
  • a fuel injection nozzle 12 is inserted in an engine block 10 above a spacer ring 11 by means of a nozzle clamping nut 13.
  • the fuel injection nozzle 12 has a valve needle 15 working in a nozzle body 14.
  • the nozzle body 14 is clamped to a nozzle holder (not shown in FIG. 1) with the nozzle clamping nut 13.
  • a housing 17 of a heating device is fastened in a screwed-in groove 16 at the end of the nozzle clamping nut 13 on the combustion chamber side.
  • the bottom of the nozzle body 14 is supported via a support plate 18 against the housing 17 of the heating device.
  • the housing 17 is closed with a cover 19 on the combustion chamber side.
  • Support plate 18 and cover 19 are designed as concentric elements, so that the fuel jet 2o can freely enter the combustion chamber, which is not shown in the figure.
  • a contacting disk 21 and the cover 19 used for contacting there is a cylindrical incandescent body 22, the mechanical strength of which is improved by one or more support webs 23.
  • a contact web 24 can be provided between the support plate 18 and the cover 19.
  • the operating voltage is supplied to the incandescent body 22 via the contacting disk 21 connected to it, which is connected to a lead 27 via a wire bracket 25 and a contact pin 26.
  • the contact pin 26 is part of a temperature and pressure-tight soldered electrical feedthrough 28 in the housing 17.
  • the housing 17 has openings 29 through which the wire bracket 25 is guided to the contacting disk 21 and through which, on the other hand, an air flow can get from the combustion chamber to the bottom of the nozzle body 14, precisely to the point where the fuel jet 2o arises between the nozzle body 14 and the valve needle 15.
  • the fuel jet draws in air according to the jet pump principle, which surrounds it in a jacket-like manner and thus passes through the cylindrical filament that it does not come into contact with the fuel, but rather heats up the air jacket, which then in turn heats up the fuel jacket. However, it is heated not only the passing air jacket from the heating element, but the infrared radiation of the heating element acts on the fuel droplets of the injected fuel jet 'and heats it. Because the nozzle base is flushed with fresh air, the nozzle cannot become clogged with soot and the quality with regard to the quantity and droplet size of the fuel jet remains constant over long operating times.
  • the cylindrical incandescent body 22 shows a cylindrical incandescent body designed as a helical heating resistor without contacting disks.
  • the cylindrical incandescent body 22 consists of a helical heating resistor 36, the cross section of which is lower in a central region 37 of the incandescent body 22 and thus the resistance is higher than in its outer regions 38.
  • the region 37 thus acts as a high-temperature region, because of its length of the heating resistor-related resistance is higher than in the outer regions 38.
  • the outer regions 38 become a low-temperature region, the lower electrical resistance results in lower current heat, so that a durable contact and fastening is possible here.
  • the helical heating resistor 36 which is fastened between two contacting disks 21, is mechanically solidified between its coils with axially attached layers 41 of ceramic paste.
  • FIG. 4 The embodiment of a cylindrical incandescent body 22 shown in FIG. 4 is shown in the two variants A and B. Both variants contain end collars 42 for holding and contacting.
  • the central region 37 working as a high-temperature region is formed by a cell-like perforation 40 which reduces the cross section of the resistance material and thus brings about an increase in resistance.
  • the helical heating resistor 36 is shown, which has the same cross section due to the uniform pitch in the entire coil area. The desired lowering of the temperature in the contact area results in the strongly formed end collars 42 due to their low electrical resistance.
  • the spiral 36 can, as shown in Fig. 3, be supported.
  • the heating element shown in FIG. 5 shows the cylindrical incandescent body 22 within a ceramic support tube 43.
  • the incandescent body has only one end collar 42. As indicated in the figure, it is designed as a helical heating resistor, which is now not constructed at the same time according to mechanical skill criteria, since the ceramic support tube 43 ensures mechanical strength.
  • the incandescent body lies between the two contacting disks (21) and is supplied with operating voltage from there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Fuel-Injection Apparatus (AREA)
EP84116262A 1984-04-14 1984-12-22 Dispositif destiné à l'injection du combustible dans les chambres de combustion Expired EP0158739B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843414201 DE3414201A1 (de) 1984-04-14 1984-04-14 Einrichtung zum einspritzen von kraftstoff in brennraeumen
DE3414201 1984-04-14

Publications (3)

Publication Number Publication Date
EP0158739A2 true EP0158739A2 (fr) 1985-10-23
EP0158739A3 EP0158739A3 (en) 1986-11-26
EP0158739B1 EP0158739B1 (fr) 1988-06-01

Family

ID=6233634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116262A Expired EP0158739B1 (fr) 1984-04-14 1984-12-22 Dispositif destiné à l'injection du combustible dans les chambres de combustion

Country Status (4)

Country Link
US (1) US4572146A (fr)
EP (1) EP0158739B1 (fr)
JP (1) JPS60219450A (fr)
DE (2) DE3414201A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006977A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion
WO1987006978A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne
DE3805933A1 (de) * 1988-02-25 1989-09-07 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff
FR2636676A1 (fr) * 1988-09-21 1990-03-23 Bosch Gmbh Robert Dispositif pour l'injection de carburant dans la chambre a explosion d'un moteur a combustion interne a auto-allumage, comprenant un diaphragme regulant et dirigeant les jets de carburants et l'air aspire
EP0423108B1 (fr) * 1986-12-16 1993-04-07 Siemens Aktiengesellschaft Injecteur de phase vapeur
EP0302637B1 (fr) * 1987-08-07 1993-12-08 LUCAS INDUSTRIES public limited company Injecteur de combustible

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614226A1 (de) * 1986-04-26 1987-10-29 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen
DE3617353A1 (de) * 1986-05-23 1987-11-26 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE3631473A1 (de) * 1986-09-16 1988-03-24 Pischinger Franz Prof Dipl Ing Zuendvorrichtung fuer eine luftverdichtende brennkraftmaschine
US4886032A (en) * 1988-11-22 1989-12-12 Chrysler Motors Corporation Fuel injector heating method
JPH02206690A (ja) * 1989-02-06 1990-08-16 Hideyo Tada 燃料の活性化方法及び燃料の活性化装置
US5288025A (en) * 1992-12-18 1994-02-22 Chrysler Corporation Fuel injector with a hydraulically cushioned valve
US5271565A (en) * 1992-12-18 1993-12-21 Chrysler Corporation Fuel injector with valve bounce inhibiting means
US5331930A (en) * 1993-04-05 1994-07-26 Mcwhorter Edward M Univalve engine
US5401935A (en) * 1993-05-28 1995-03-28 Heaters Engineering, Inc. Fuel heating assembly
ES2100753T3 (es) * 1994-04-12 1997-06-16 Ulev Gmbh Dispositivo para nebulizacion de combustible.
DE4446242A1 (de) * 1994-12-23 1996-06-27 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für einen Verbrennungsmotor
GB2300224B (en) * 1995-04-28 1999-04-07 Perkins Ltd An internal combustion engine including a fuel vaporising chamber
US6102303A (en) 1996-03-29 2000-08-15 Siemens Automotive Corporation Fuel injector with internal heater
US6109543A (en) * 1996-03-29 2000-08-29 Siemens Automotive Corporation Method of preheating fuel with an internal heater
US5758826A (en) * 1996-03-29 1998-06-02 Siemens Automotive Corporation Fuel injector with internal heater
US5836289A (en) * 1997-06-10 1998-11-17 Southwest Research Institute Porous element fuel vaporizer
DE19733803A1 (de) * 1997-08-05 1999-02-11 Markus Kalla Vorrichtung zur Kraftstoffvorheizung für eine Kolben-Brennkraftmaschine mit Kraftstoffheißverdampfung
US6422481B2 (en) 1998-06-01 2002-07-23 Siemens Automotive Corporation Method of enhancing heat transfer in a heated tip fuel injector
US6135360A (en) * 1998-06-01 2000-10-24 Siemens Automotive Corporation Heated tip fuel injector with enhanced heat transfer
KR200178341Y1 (ko) * 1999-11-22 2000-04-15 박재승 연료 미세분사장치
US20070295314A1 (en) * 2000-08-23 2007-12-27 Naiqiang Dong Fuel saving heater for internal combustion engine
AU2003201184B2 (en) * 2002-01-04 2008-07-17 Glew Technologies Pty Ltd Fuel supply system for an internal combustion engine
AUPR983202A0 (en) * 2002-01-04 2002-01-31 Glew, Wayne Kenneth Fuel supply system for an internal combustion engine
US7481376B2 (en) * 2006-03-17 2009-01-27 Continental Automotive Systems Us, Inc. Variable inductive heated injector
US7992549B2 (en) * 2007-05-21 2011-08-09 Casey Loyd Method of fueling an internal combustion engine using pressurized and heated fuel

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DE834467C (de) * 1949-08-14 1954-08-16 Wehrmann Motoren Ing Zimmer & Brennkraftmaschine mit Brennstoffeinspritzung und Selbstzuendung
DE2843534A1 (de) * 1977-10-06 1979-04-19 Aisan Ind Kraftstoffliefereinrichtung fuer eine brennkraftmaschine
JPS58106326A (ja) * 1981-12-19 1983-06-24 Ngk Spark Plug Co Ltd セラミツクグロ−プラグ
EP0102507A2 (fr) * 1982-08-14 1984-03-14 Robert Bosch Gmbh Dispositif destiné à l'injection du combustible dans les chambres de combustion des moteurs à combustion interne du type à auto-allumage
GB2130706A (en) * 1982-09-30 1984-06-06 Kyocera Corp Intake burner
WO1984004567A1 (fr) * 1983-05-13 1984-11-22 Bosch Gmbh Robert Dispositif d'injection de carburant dans des chambres de combustion

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE834467C (de) * 1949-08-14 1954-08-16 Wehrmann Motoren Ing Zimmer & Brennkraftmaschine mit Brennstoffeinspritzung und Selbstzuendung
DE2843534A1 (de) * 1977-10-06 1979-04-19 Aisan Ind Kraftstoffliefereinrichtung fuer eine brennkraftmaschine
JPS58106326A (ja) * 1981-12-19 1983-06-24 Ngk Spark Plug Co Ltd セラミツクグロ−プラグ
EP0102507A2 (fr) * 1982-08-14 1984-03-14 Robert Bosch Gmbh Dispositif destiné à l'injection du combustible dans les chambres de combustion des moteurs à combustion interne du type à auto-allumage
GB2130706A (en) * 1982-09-30 1984-06-06 Kyocera Corp Intake burner
WO1984004567A1 (fr) * 1983-05-13 1984-11-22 Bosch Gmbh Robert Dispositif d'injection de carburant dans des chambres de combustion

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006977A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion
WO1987006978A1 (fr) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Dispositif d'injection de carburant dans la chambre de combustion d'un moteur a combustion interne
US4788953A (en) * 1986-05-09 1988-12-06 Robert Bosch Gmbh Device for injecting fuel into a combustion chamber of an internal combustion engine
US4821696A (en) * 1986-05-09 1989-04-18 Robert Bosch Gmbh Device for injecting fuel into a combustion chamber of an internal combustion engine
EP0423108B1 (fr) * 1986-12-16 1993-04-07 Siemens Aktiengesellschaft Injecteur de phase vapeur
EP0302637B1 (fr) * 1987-08-07 1993-12-08 LUCAS INDUSTRIES public limited company Injecteur de combustible
DE3805933A1 (de) * 1988-02-25 1989-09-07 Bosch Gmbh Robert Einrichtung zum einspritzen von kraftstoff
DE3805933C2 (de) * 1988-02-25 1998-04-23 Bosch Gmbh Robert Einrichtung zum Einspritzen von Kraftstoff
FR2636676A1 (fr) * 1988-09-21 1990-03-23 Bosch Gmbh Robert Dispositif pour l'injection de carburant dans la chambre a explosion d'un moteur a combustion interne a auto-allumage, comprenant un diaphragme regulant et dirigeant les jets de carburants et l'air aspire

Also Published As

Publication number Publication date
EP0158739A3 (en) 1986-11-26
JPS60219450A (ja) 1985-11-02
DE3471718D1 (en) 1988-07-07
US4572146A (en) 1986-02-25
DE3414201A1 (de) 1985-10-17
EP0158739B1 (fr) 1988-06-01

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