EP1302632B1 - Dispositif d'alimentation en carburant pour moteur à injection - Google Patents

Dispositif d'alimentation en carburant pour moteur à injection Download PDF

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Publication number
EP1302632B1
EP1302632B1 EP02022896A EP02022896A EP1302632B1 EP 1302632 B1 EP1302632 B1 EP 1302632B1 EP 02022896 A EP02022896 A EP 02022896A EP 02022896 A EP02022896 A EP 02022896A EP 1302632 B1 EP1302632 B1 EP 1302632B1
Authority
EP
European Patent Office
Prior art keywords
fuel
supply system
engine
outlet
fuel supply
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
EP02022896A
Other languages
German (de)
English (en)
Other versions
EP1302632A1 (fr
Inventor
Gianni Borghi
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.)
Lombardini SRL
Original Assignee
Lombardini SRL
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Filing date
Publication date
Application filed by Lombardini SRL filed Critical Lombardini SRL
Publication of EP1302632A1 publication Critical patent/EP1302632A1/fr
Application granted granted Critical
Publication of EP1302632B1 publication Critical patent/EP1302632B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/18—Indicating or safety devices
    • F01M1/20—Indicating or safety devices concerning lubricant pressure
    • F01M1/22—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure
    • F01M1/24—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure acting on engine fuel system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M11/12—Indicating devices; Other safety devices concerning lubricant level

Definitions

  • the present invention relates to an injection engine fuel supply system.
  • the present invention may be used to advantage, though not exclusively, in hand-start injection engines with no electric system, such as the type used in agricultural or industrial machines in general, to which the following description refers purely by way of example.
  • One solution to the problem adopted in other types of injection engines, e.g. automotive engines, is to indicate - typically by means of an indicator light - when the oil level falls below a minimum value, on the basis of an electric signal supplied by an oil level or oil pressure sensor in the oil sump.
  • an injection engine supply system as defined in Claim 1.
  • Numeral 1 in Figure 1 indicates as a whole a fuel supply system for an injection engine 2, in particular a one-cylinder diesel engine (shown schematically).
  • Fuel supply system 1 substantially comprises a fuel tank 3; a fuel injector 4; a one-way-flow injection pump 5 connected to fuel tank 3 by an intake line 6, and to fuel injector 4 by a delivery line 7; and a fuel filter 8 along intake line 6.
  • fuel filter 8 is a cartridge type, and comprises a fuel inlet 8a connected to the bottom of fuel tank 3; an air inlet 8b; an outlet 8c connected to the inlet 5a of injection pump 5; and a vent outlet 8d connected to the top of fuel tank 3 by a vent conduit 9 to feed any air in fuel filter 8 back into the tank.
  • Injection pump 5 also comprises an outlet 5b connected to fuel injector 4 by delivery line 7; and a recirculating outlet 5c connected to fuel tank 3 by a recirculating conduit 10 connected to vent conduit 9.
  • injection pump 5 conveniently has a high intake flow, much higher than - preferably three times - the injection flow of fuel injector 4, and the surplus fuel drawn from fuel tank 3 is fed back into fuel tank 3 along recirculating conduit 10 and vent conduit 9.
  • Fuel injector 4 is connected to fuel tank 3 by a recirculating conduit 11, which feeds back into fuel tank 3 part of the fuel used in known manner by and for operation of fuel injector 4.
  • Fuel supply system 1 also comprises an engine cut-off device for turning off engine 2 when the lubricating oil level in the oil sump 17 falls below a desired minimum.
  • the engine cut-off device substantially comprises a pulse-operated pump 12 having an excitation chamber 13 and a pumping chamber 14 separated by a diaphragm 15 on which acts a contrast spring 16 housed in excitation chamber 13.
  • excitation chamber 13 has an excitation port 13a communicating with oil sump 17 of engine 2 along an excitation conduit 18, the outlet section 18a of which is located substantially at the minimum lubricating oil level (shown by the dash line); and excitation conduit 18 is so positioned that the incoming lubricating oil can flow back into oil sump 17.
  • Pumping chamber 14 has an inlet 14a communicating with the top of fuel tank 3 along an intake conduit 19 to draw in air from the tank; and an outlet 14b communicating with the air inlet 8b of fuel filter 8 along a delivery conduit 20.
  • Inlet 14a and outlet 14b of pulse-operated pump 12 have respective non-return valves 21 and 22 permitting one-way airflow from the top of fuel tank 3 to pumping chamber 14, and from pumping chamber 14 to fuel filter 8 respectively.
  • Fuel supply system 1 cuts off engine 2 by supplying air into fuel filter 8, which therefore supplies no fuel to injection pump 5 or, consequently, to fuel injector 4.
  • pulse-operated pump 12 operation of which is governed by the pressure pulses generated inside the block of engine 2 by movement of the piston.
  • outlet section 18a of excitation conduit 18 is located, outlet section 18a is no longer immersed in the lubricating oil, so that the pressure pulses generated by movement of the piston reach excitation chamber 13 of pulse-operated pump 12, which thus comes into operation to supply air from fuel tank 3 into fuel filter 8, which is consequently emptied of fuel.
  • the air in fuel filter 8 is fed by injection pump 5 to fuel injector 4 which, no longer supplying fuel to engine 2, rapidly cuts off the engine.
  • fuel filter 8 is emptied, and therefore engine 2 cut off, extremely quickly, by injection pump 5 drawing much more fuel than required by fuel injector 4, so that air is fed rapidly from fuel filter 8 to injection pump 5.
  • pulse-operated air pump 12 drawing air from fuel tank 3 as opposed to the outside, operation of the pump is unaffected by the difference in pressure between the inside of fuel tank 3 and the outside atmosphere, and any fuel leakage from pulse-operated air pump 12 does not leak to the outside.
  • Numeral 25 in Figure 2 indicates as a whole a fuel supply system according to a second embodiment of the present invention. Like numerals indicate corresponding parts already described with reference to Figure 1.
  • Fuel supply system 25 differs from fuel supply system 1 in that intake conduit 19, which supplies air to port 14a, is connected to an air suction duct 26 of engine 2, downstream from an air filter 27, rather than to fuel tank 3.
  • the present invention provides for acting on the engine in the event of poor lubrication without requiring an electric system or oil level or pressure sensors, and by simply adding a straightforward, low-cost, pulse-operated air pump.
  • the present invention also provides for fast cut-off and start-up of the engine, by the injection pump drawing large amounts of air and fuel from the fuel tank, so that air is fed and exhausted rapidly to and from the fuel filter. This is particularly important in the case of injection engines with no electric system, which, being hand-started, must permit fairly fast start-up.
  • the pulse-operated pump inlet may communicate directly with the outside as opposed to the top of the fuel tank or air suction duct; and the fuel filter may be other than as described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Claims (9)

  1. Dispositif d'alimentation en carburant (1) pour un moteur à injection (2) comprenant un carter d'huile (17), le système comprenant un réservoir à carburant (3), un injecteur de carburant (4), et une pompe à injection (5) ayant une entrée (5a) reliée au réservoir à carburant (3) par une conduite d'entrée (6), et une sortie (5b) reliée à l'injecteur de carburant (4) par une conduite de distribution (7), et comprenant un dispositif de coupure de moteur (12) pour arrêter ledit moteur (2) lorsque l'huile de lubrification dans ledit carter d'huile (17) est inférieure à un niveau minimal, caractérisé en ce que ledit dispositif de coupure de moteur comprenant une pompe actionnée par impulsion (12) ayant une entrée (14a) en communication avec un environnement contenant de l'air (3, 26), un orifice d'excitation (13a) en communication avec ledit carter d'huile (17) le long d'un conduit d'excitation (18) ayant une section de sortie (18a) située sensiblement audit niveau minimal d'huile de lubrification, et une sortie (14b) en communication avec ledit conduite d'entrée (6).
  2. Dispositif d'alimentation en carburant (1) selon la revendication 1, caractérisé en ce que ledit environnement contenant de l'air est ledit réservoir à carburant (3).
  3. Dispositif d'alimentation en carburant (1) selon la revendication 1, caractérisé en ce que ledit environnement contenant de l'air est un conduit d'aspiration d'air dudit moteur (2).
  4. Dispositif d'alimentation en carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend également un filtre à carburant (8) situé le long de ladite conduite d'entrée (6) et ayant une entrée de carburant (8a) reliée audit réservoir à carburant (3), une entrée d'air (8b) reliée à ladite sortie (14b) de ladite pompe actionnée par impulsion (12), et une sortie (8c) reliée à ladite entrée (5a) de ladite pompe à injection (5).
  5. Dispositif d'alimentation en carburant (1) selon la revendication 4, caractérisé en ce que ledit filtre à carburant (8) a également une sortie de ventilation (8d) reliée audit réservoir à carburant (3) par un conduit de ventilation (9) pour évacuer l'air dans le filtre à carburant (8) dans le réservoir à carburant (3).
  6. Dispositif d'alimentation en carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite pompe à injection (5) a un flux d'entrée supérieur au flux d'injection dudit injecteur de carburant (4).
  7. Dispositif d'alimentation en carburant (1) selon la revendication 6, caractérisé en ce que ladite pompe à injection (5) a également une sortie de recirculation (5c) reliée audit réservoir à carburant (3) par un conduit de recirculation (10) pour renvoyer le carburant en surplus dans le réservoir à carburant (3).
  8. Dispositif d'alimentation en carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite entrée (14a) et ladite sortie (14b) de ladite pompe actionnée par impulsion (12) ont des clapets de retenue respectifs (21, 22).
  9. Dispositif d'alimentation en carburant (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite pompe actionnée par impulsion (12) a une chambre d'excitation (13) et une chambre de pompage (14) séparées par une membrane (15).
EP02022896A 2001-10-16 2002-10-14 Dispositif d'alimentation en carburant pour moteur à injection Expired - Lifetime EP1302632B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20010980 2001-10-16
IT2001TO000980A ITTO20010980A1 (it) 2001-10-16 2001-10-16 Impianto di alimentazione del combustibile per un motore ad iniezione.

Publications (2)

Publication Number Publication Date
EP1302632A1 EP1302632A1 (fr) 2003-04-16
EP1302632B1 true EP1302632B1 (fr) 2005-07-20

Family

ID=11459262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02022896A Expired - Lifetime EP1302632B1 (fr) 2001-10-16 2002-10-14 Dispositif d'alimentation en carburant pour moteur à injection

Country Status (5)

Country Link
EP (1) EP1302632B1 (fr)
AT (1) ATE299988T1 (fr)
DE (1) DE60205073T2 (fr)
ES (1) ES2244710T3 (fr)
IT (1) ITTO20010980A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010010749B4 (de) * 2010-03-09 2016-12-22 Wacker Neuson Produktion GmbH & Co. KG Antriebssystem mit Vorrichtung zur Unterbrechung des Betriebs bei drohendem Betriebsstoffmangel sowie Arbeitsgerät und Verfahren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203408A (en) * 1978-11-15 1980-05-20 Honda Giken Kogyo Kabushiki Kaisha Lubricating oil detector for an internal combustion engine
US4622935A (en) * 1985-11-13 1986-11-18 Briggs & Stratton Corp. Low level lubricating oil detector
US4911121A (en) * 1989-01-27 1990-03-27 Barnes Richard W Engine protection device
JP2785904B2 (ja) * 1993-08-30 1998-08-13 本田技研工業株式会社 ディーゼルエンジンの停止装置
DE19631652A1 (de) * 1996-08-05 1998-02-12 Hatz Motoren Automatische Unterbrechung der Kraftstoffversorgung
US5878710A (en) * 1998-07-20 1999-03-09 Caterpillar Inc. Fuel injection shutdown system

Also Published As

Publication number Publication date
ITTO20010980A1 (it) 2003-04-16
ATE299988T1 (de) 2005-08-15
DE60205073T2 (de) 2006-03-30
EP1302632A1 (fr) 2003-04-16
DE60205073D1 (de) 2005-08-25
ES2244710T3 (es) 2005-12-16

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