DE2915285A1 - Heating device for Diesel engine - uses direct injection and heating element in wall of combustion chamber coupled to source via sliding contacts - Google Patents

Heating device for Diesel engine - uses direct injection and heating element in wall of combustion chamber coupled to source via sliding contacts

Info

Publication number
DE2915285A1
DE2915285A1 DE19792915285 DE2915285A DE2915285A1 DE 2915285 A1 DE2915285 A1 DE 2915285A1 DE 19792915285 DE19792915285 DE 19792915285 DE 2915285 A DE2915285 A DE 2915285A DE 2915285 A1 DE2915285 A1 DE 2915285A1
Authority
DE
Germany
Prior art keywords
combustion chamber
heating element
piston
heating device
heating
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
DE19792915285
Other languages
German (de)
Other versions
DE2915285C2 (en
Inventor
Hans Dr Ing Hagen
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.)
MAN Truck and Bus SE
Original Assignee
MAN Maschinenfabrik Augsburg Nuernberg AG
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 MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Maschinenfabrik Augsburg Nuernberg AG
Priority to DE19792915285 priority Critical patent/DE2915285A1/en
Publication of DE2915285A1 publication Critical patent/DE2915285A1/en
Application granted granted Critical
Publication of DE2915285C2 publication Critical patent/DE2915285C2/de
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0654—Thermal treatments, e.g. with heating elements or local cooling
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0675—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space being substantially spherical, hemispherical, ellipsoid or parabolic
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0603—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
    • F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The heating device for the engine combustion chamber (2) to aid cold starting comprises an electric heating element (4) embedded in the wall of the spherical combustion chamber (2) formed in the base of the piston. The heating element (4) lies in line with the injected fuel stream (3) and has insulated connection leads (5, 5') connected via sliding contacts (6.7, 6', 7') to a stationary source. Pref. each connection lead (5, 5') is coupled to one of two contacts (6, 6') lying in different planes and behind one another on the inside of the position (1). These contacts (6, 6') co-operate with two spring contact tracks (7, 7') housed within the piston (1).

Description

kr/ba/fr - 4 -kr / ba / fr - 4 -

MASCHINENFABRIK AUGSBURG-NÜRNBERG
AktiengesellschaftMASCHINENFABRIK AUGSBURG-NÜRNBERG
Corporation

München, 5. April 1979Munich, April 5, 1979

Heizvorrichtung für den Brennraum einer Kolbenbrennkraftmaschine mit direkter Einspritzung und Anlagerung des Kraftstoffs an der Wand eines im Kolbenboden ausgebildeten BrennraumsHeating device for the combustion chamber of a piston internal combustion engine with direct injection and deposition of the fuel on the wall of a combustion chamber formed in the piston crown

Bei Kolbenbrennkraftmaschinen mit direkter Einspritzung und Anlagerung des Kraftstoffs an der Wand eines im Kolbenboden ausgebildeten Brennraums, insbesondere zur Anwendung beim M-Verfahren, treten im Kaltstart und im Betrieb mit niedriger Teillast häufig dadurch Zündschwierigkeiten auf, daß der Kraftstoff an dem zu kalten Kolbenboden nicht ausreichend verdampft. Die Folgen sind Anlaßschwierxgkeiten sowie Rauchentwicklung und entsprechende Geruchsbelästigung.In piston internal combustion engines with direct injection and deposition of the fuel on the wall of one in the piston crown trained combustion chamber, especially for use in the M process, occur in cold starts and in operation with lower Partial load often results in ignition difficulties because there is insufficient fuel at the piston head which is too cold evaporates. The consequences are starting difficulties as well as smoke development and corresponding odor nuisance.

Da der Kraftstoff in geschlossenem Strahl in einen im Kolbenboden ausgebildeten Brennraum eingespritzt wird, hilft auch keine Glühkerze, wie sie bei Vorkammermotoren verwendet wird.Because the fuel is in a closed jet in one in the piston crown formed combustion chamber is injected, no glow plug, as used in pre-chamber engines, helps will.

0300Ä3/039S0300Ä3 / 039S

Es ist Aufgabe der Erfindung, eine Vorrichtung aufzuzeigen, durch deren Einbau jene Schwierigkeiten vermieden werden, also keine Zündschwierigkeiten beim Kaltstart oder im Betrieb mit niedriger Teillast auftreten.It is the object of the invention to provide a device which, by installing it, avoids those difficulties so there are no ignition difficulties during a cold start or when operating with a low partial load.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst, während die Ansprüche 2 bis 7 weitere Verbesserungen bzw. Vereinfachungen angeben.This object is achieved with the characterizing features of claim 1, while claims 2 to 7 further Indicate improvements or simplifications.

Die Erfindung wird anhand der Zeichnung mit einem Ausführungsbeispiel erläutert:The invention is based on the drawing with an exemplary embodiment explained:

Im Boden des Kolbens 1 der Brennkraftmaschine ist ein etwa kugeliger Brennraum 2 ausgebildet, in den der Kraftstoffstrahl 3 eingespritzt wird. Im nahen Bereich der Auftreffstelle dieses Strahls am Brennraumboden ist in dessen Wand ein elektrisches Heizelement 4 eingebettet. Dessen beide Anschlußleitungen 5 und 5' sind zu Kontaktstellen 6 bzw. 6' geführt, die an der Kolbeninnenseite hintereinander, also in verschiedenen Ebenen liegend, isoliert angeordnet sind. An diesen Kontaktstellen liegt je eine ortsfeste federnde kontaktfahne 7 bzw. 71 an. Diese Kontaktfahnen sind mit einer nicht eigens gezeichneten ortsfesten elektrischen Heizquelle verbunden und ragen so in den Kolbeninnenraum, daß sie die Kolbenhubbewegung nicht stören. Über Nocken 8In the bottom of the piston 1 of the internal combustion engine, an approximately spherical combustion chamber 2 is formed, into which the fuel jet 3 is injected. In the vicinity of the point of impact of this beam on the combustion chamber floor, an electrical heating element 4 is embedded in its wall. Its two connecting lines 5 and 5 'are led to contact points 6 and 6', which are arranged on the inside of the piston one behind the other, that is to say lying in different planes, in an insulated manner. A stationary resilient contact lug 7 or 7 1 rests on each of these contact points. These contact lugs are connected to a stationary electrical heating source (not specifically drawn) and protrude into the interior of the piston in such a way that they do not interfere with the piston stroke movement. Via cams 8

6.1870
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0300A3/039S0300A3 / 039S

können die Kontaktfahnen von den Kontaktstücken abgehoben werden.the contact lugs can be lifted off the contact pieces.

Im ausgezogen gezeichneten eingeschalteten Betriebszustand gleiten die Kontaktstellen 6 und 6' der Kolben über deren ganzen Hub hinweg an den Kontaktfahnen 7 und 7' stromabschließend vorbei, so daß das Heizelement 4 den Auftreffbereich des Kr aft stoff Strahls 3 an der Wand des Brennraums während der erforderlichen Zeit beheizt; dies kann im Stillstand zum Vorheizen des Kaltstarts und während des Motorlaufs zum Erwärmen bei niedriger Teillast geschehen. Damit werden alle Zündschwierigkeiten behoben.In the switched-on operating state shown in solid lines, the contact points 6 and 6 'of the pistons slide over them the entire stroke on the contact lugs 7 and 7 'downstream over, so that the heating element 4 hits the area of impact of the fuel jet 3 on the wall of the combustion chamber heated for the required time; this can be used to preheat the cold start at a standstill and while the engine is running done for heating at low partial load. This eliminates all ignition problems.

Bei ausreichend warmem Motor werden die Kontaktfahnen 7 und 7' durch Drehung des Nockens 8 von den Kontaktstellen 6 bzw. 6' abgehoben. Zur Automatisierung dieses Abhebvorgangs können Temperaturmeßstellen im Kolbenboden, insbesondere im Brennraum angebracht sein.When the engine is sufficiently warm, the contact lugs 7 and 7 ′ are removed from the contact points 6 by rotating the cam 8 or 6 'lifted. To automate this lifting process, temperature measuring points in the piston crown, in particular be attached in the combustion chamber.

Zur einfachsten Verwirklichung des automatischen Andrückens und Abhebens der Kontaktfahnen 7 und 7' sind diese als Bimetallstreifen ausgebildet, die sich bei ausreichend hoher Temperatur im Kolbeninnenraum von selbst von den Kontaktstellen 6 bzw. 61 abheben; Nocken 8 sind dabei überflüssig.For the simplest implementation of the automatic pressing and lifting of the contact lugs 7 and 7 ', these are designed as bimetallic strips which lift themselves off the contact points 6 and 6 1 at a sufficiently high temperature in the interior of the piston; Cams 8 are superfluous.

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Ö3QÖ43/039SÖ3QÖ43 / 039S

—•7 —- • 7 -

Zur Vereinfachung kann ferner das Heizelement 4 nur eine einzige Anschlußleitung 5, eine einzige Kontaktstelle 6 und eine einzige Kontaktfahne 7 aufweisen, während der zweite Anschluß an die Motormasse gelegt ist.For the sake of simplification, the heating element 4 can also have only a single connection line 5, a single contact point 6 and have a single contact tab 7, while the second connection is connected to the motor ground.

Schließlich kann das Heizelement 4 in den Kolbenboden mit eingegossen sein.Finally, the heating element 4 can be cast into the piston head.

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030043/0396030043/0396

LeerseiteBlank page

Claims (5)

kr/ba/fr MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft München, 5. April 1979 Patentansprüchekr / ba / fr MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Munich, April 5, 1979 Patent claims 1. Heizvorrichtung für den Brennraum einer Ko.lbenbrennkraftmaschine mit direkter Einspritzung und Anlagerung des Kraftstoffs an der Wand eines im Kolbenboden ausgebildeten Brennraums, insbesondere zur Anwendung beim M-Verfahren, dadurch gekennzeichnet, daß im Boden des Kolbens (1) der Brennkraftmaschine, und zwar im Auftreff bereich des KraftstoffStrahls (3) am dort ausgebildeten etwa kugeligen Brennraum (2), ein elektrisches Heizelement (4) eingebettet ist, das mit isolierten Anschlußleitungen (5, 5') versehen ist, die über Schleifkontakte (6, 7 bzw. 61, 7') zu einer ortsfesten elektrischen Heizquelle führen.1. Heating device for the combustion chamber of a Ko.lbenbrennkraftmaschine with direct injection and deposition of the fuel on the wall of a combustion chamber formed in the piston head, in particular for use in the M-method, characterized in that in the bottom of the piston (1) of the internal combustion engine, namely In the area of impact of the fuel jet (3) on the roughly spherical combustion chamber (2) formed there, an electrical heating element (4) is embedded, which is provided with insulated connection lines (5, 5 ') which are connected via sliding contacts (6, 7 or 6 1 , 7 ') lead to a stationary electrical heating source. 2. Heizvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Anschlußleitungen (5, 5") zu je einer2. Heating device according to claim 1, characterized in that that the connecting lines (5, 5 ") to one each 6.18706.1870 030043/0396030043/0396 Kontaktstelle (6, 61) führen, die an der Kolbeninnenseite hintereinander, also in verschiedenen Ebenen liegend, isoliert angeordnet sind und daß die Vorrichtung in den Kolbeninnenraum ragende ortsfeste, auch während des Motorlaufs federnd anliegende Kontaktfahnen (7 bzw. 7') aufweist.Lead contact point (6, 6 1 ), which are arranged on the inside of the piston one behind the other, i.e. lying in different planes, insulated and that the device has stationary contact lugs (7 or 7 ') protruding into the interior of the piston, even when the engine is running. 3. Heizvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Kontaktfahnen (7, 7') vorzugsweise durch einen Nocken (8) abhebbar angeordnet sind.3. Heating device according to claim 2, characterized in that that the contact lugs (7, 7 ') are preferably arranged such that they can be lifted off by a cam (8). 4. Heizvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Nocken (8) selbsttätig, z. B. von einer Temperaturmeßstelle im Kolbenboden, insbesondere am Brennraum, steuerbar ist.4. Heating device according to claim 3, characterized in that that the cam (8) automatically, for. B. from a temperature measuring point in the piston crown, especially on Combustion chamber, is controllable. 5. Heizvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Heizelement (4) eine einzige Anschlußleitung (5), eine einzige Kontaktstelle (6) und eine einzige Kontaktfahne (7) aufweist, während der zweite Anschluß an die Motormasse gelegt ist.5. Heating device according to one of claims 1 to 4, characterized characterized in that the heating element (4) has a single connection line (5), a single contact point (6) and a single contact lug (7), while the second connection is connected to the motor ground. 6. Heizelement nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß die Kontaktfahnen (7, 71) als Bimetallstreifen ausgebildet sind.6. Heating element according to one of claims 2 to 5, characterized in that the contact lugs (7, 7 1 ) are designed as bimetal strips. 6.1870
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04/05/1979 030043/0390030043/0390 7. Heizelement nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Heizelement (4) in den Kolbenboden mit eingegossen ist.7. Heating element according to one of claims 1 to 6, characterized characterized in that the heating element (4) is cast into the piston head. 6.1870
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DE19792915285 1979-04-14 1979-04-14 Heating device for Diesel engine - uses direct injection and heating element in wall of combustion chamber coupled to source via sliding contacts Granted DE2915285A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792915285 DE2915285A1 (en) 1979-04-14 1979-04-14 Heating device for Diesel engine - uses direct injection and heating element in wall of combustion chamber coupled to source via sliding contacts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792915285 DE2915285A1 (en) 1979-04-14 1979-04-14 Heating device for Diesel engine - uses direct injection and heating element in wall of combustion chamber coupled to source via sliding contacts

Publications (2)

Publication Number Publication Date
DE2915285A1 true DE2915285A1 (en) 1980-10-23
DE2915285C2 DE2915285C2 (en) 1987-02-12

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DE19792915285 Granted DE2915285A1 (en) 1979-04-14 1979-04-14 Heating device for Diesel engine - uses direct injection and heating element in wall of combustion chamber coupled to source via sliding contacts

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DE (1) DE2915285A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543084A1 (en) * 1984-12-07 1986-06-12 Toyota Jidosha K.K., Toyota, Aichi CONTROL SYSTEM FOR FUEL EVAPORATION SPEED IN AN ENGINE WITH DIRECT FUEL INJECTION
US5329901A (en) * 1990-06-04 1994-07-19 Nippon Clean Engine Research Institute Co., Ltd. Hot surface impact ignition type internal combustion engine and method of hot surface impact ignition
WO2003036061A1 (en) * 2001-10-04 2003-05-01 Robert Bosch Gmbh Auxiliary starter agent and combustion chamber

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE702346C (en) * 1939-03-29 1941-02-06 Werke Kiel Akt Ges Deutsche others for operation with hard-to-end fuel
DE1023632B (en) * 1954-07-16 1958-01-30 Hans Krug Starting device for an air-compressing self-igniting internal combustion engine
DE1135704B (en) * 1958-11-19 1962-08-30 Kloeckner Humboldt Deutz Ag Pre-chamber diesel engine
DE976295C (en) * 1954-06-20 1963-06-20 Motoren Werke Mannheim Ag Internal combustion engine with fuel injection in a combustion chamber located in the piston, in which an insert is attached

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE702346C (en) * 1939-03-29 1941-02-06 Werke Kiel Akt Ges Deutsche others for operation with hard-to-end fuel
DE976295C (en) * 1954-06-20 1963-06-20 Motoren Werke Mannheim Ag Internal combustion engine with fuel injection in a combustion chamber located in the piston, in which an insert is attached
DE1023632B (en) * 1954-07-16 1958-01-30 Hans Krug Starting device for an air-compressing self-igniting internal combustion engine
DE1135704B (en) * 1958-11-19 1962-08-30 Kloeckner Humboldt Deutz Ag Pre-chamber diesel engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543084A1 (en) * 1984-12-07 1986-06-12 Toyota Jidosha K.K., Toyota, Aichi CONTROL SYSTEM FOR FUEL EVAPORATION SPEED IN AN ENGINE WITH DIRECT FUEL INJECTION
US5329901A (en) * 1990-06-04 1994-07-19 Nippon Clean Engine Research Institute Co., Ltd. Hot surface impact ignition type internal combustion engine and method of hot surface impact ignition
WO2003036061A1 (en) * 2001-10-04 2003-05-01 Robert Bosch Gmbh Auxiliary starter agent and combustion chamber

Also Published As

Publication number Publication date
DE2915285C2 (en) 1987-02-12

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OAM Search report available
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OI Miscellaneous see part 1
8127 New person/name/address of the applicant

Owner name: M.A.N. MASCHINENFABRIK AUGSBURG-NUERNBERG AG, 8000

8110 Request for examination paragraph 44
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Owner name: M A N NUTZFAHRZEUGE GMBH, 8000 MUENCHEN, DE

D2 Grant after examination
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8327 Change in the person/name/address of the patent owner

Owner name: MAN NUTZFAHRZEUGE AG, 8000 MUENCHEN, DE

8339 Ceased/non-payment of the annual fee