EP0949416A1 - Fuel supply arrangement to at least one combustion chamber of an internal combustion engine - Google Patents

Fuel supply arrangement to at least one combustion chamber of an internal combustion engine Download PDF

Info

Publication number
EP0949416A1
EP0949416A1 EP99106831A EP99106831A EP0949416A1 EP 0949416 A1 EP0949416 A1 EP 0949416A1 EP 99106831 A EP99106831 A EP 99106831A EP 99106831 A EP99106831 A EP 99106831A EP 0949416 A1 EP0949416 A1 EP 0949416A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pumping unit
supply
pressure
arrangement according
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.)
Withdrawn
Application number
EP99106831A
Other languages
German (de)
English (en)
French (fr)
Inventor
Marcello Cristiani
Massimo Lolli
Paolo Pasquali
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli 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 Magneti Marelli SpA filed Critical Magneti Marelli SpA
Publication of EP0949416A1 publication Critical patent/EP0949416A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators

Definitions

  • the invention relates to a fuel supply arrangement and at least a combustion chamber for an internal combustion engine.
  • arrangements for a fuel supply to combustion chambers at present comprise a fuel manifold, inside which is stored the fuel to be supplied to the combustion chamber; one or several injectors connected to the fuel manifold, and able to supply on demand a specific volume of fuel to each combustion chamber of the said engine; a fuel storage reservoir; and a pumping unit able to draw the fuel from the storage reservoir to supply it at high pressure to the inside of the said fuel manifold.
  • the supply arrangements also comprise a pressure regulator of the proportional type located on the fuel manifold to prevent the fuel pressure inside the fuel manifold from exceeding a given specific threshold value, and a recirculation duct connecting the pressure regulator with the output of the pumping unit to convey upstream of the pumping unit itself the excess fuel collected from the fuel manifold by the pressure regulator.
  • the pumping unit is normally located at a considerable distance from the fuel manifold, in consequence whereof the recirculation duct is of considerable length which makes it difficult to locate inside the engine compartment.
  • the recirculation duct In effect since highly inflammable fuel is passing through it, the recirculation duct must be located in a protected position, away from sources of heat or sharp edged components likely to compromise its structural integrity.
  • a second disadvantage of the supply arrangements described above is that the pumping unit must supply on request a pressure such as to guarantee either the flow of fuel to the fuel manifold or the return of the fuel through the recirculation duct.
  • a third disadvantage of the supply arrangements described above is that the pressure regulator does not manage to adequately damp the pressure peaks occurring cyclically during normal operation of the pumping unit f the latest generation.
  • the present tendency on the market is in effect to use as pumping unit high pressure volumetric pumps which supply a pressure variable in time at high frequency, whereas the speed of response of the pressure regulator is notably low.
  • the purpose of the present invention is to achieve a fuel supply arrangement free from the disadvantages described above.
  • a fuel supply arrangement is achieved with at least one combustion chamber for an internal combustion engine; the supply arrangement comprising a fuel manifold, at least one pumping unit able to supply fuel to the inside of the fuel manifold, and at least one injector group connected to the said fuel manifold to supply on request a specific volume of fuel to the said combustion chamber; the output of the pumping unit being in communication with the fuel manifold, the intake of the pumping unit being in communication with a fuel storage reservoir; the supply arrangement being characterised in that it comprises a recirculation duct, connecting upstream of the fuel manifold, the supply from the pumping unit with the intake of the pumping unit, and means to regulate the fuel flow into the recirculation duct; the said regulating means being able to regulate the pressure of incoming fuel to the fuel manifold.
  • the reference 1 indicates as a whole assembly a fuel supply arrangement to the combustion chambers 2 of an internal combustion engine 3 of known type.
  • the supply arrangement 1 is able to supply on demand a given volume of fuel inside each combustion chamber 2 of the engine 3.
  • the said supply may occur either by atomising the fuel within the intake ducts 4 of the engine 3 which connect the combustion chambers 2 with atmosphere (indirect injection), as illustrated in Figure 1, or atomising the fuel directly inside each combustion chamber 2 of the engine 3 (direct injection).
  • the supply arrangement 1 comprises a fuel manifold 5 around which the fuel is stored before being supplied to the combustion chambers 2; a fuel storage reservoir 6, within which is stored the fuel required for the operation of the engine 3; and a pumping unit 7 able to supply the fuel inside the manifold 5 under a pressure, which will preferably, though not necessarily be comprised between 40 and 120 bars.
  • the pumping unit 7 is a mechanical pump of the volumetric type which supplies to the intake 7a a flow of fuel at cyclically variable pressure between a minimum value and a maximum value.
  • the supply arrangement 1 also comprises one or several injectors 8 of known type interposed between the fuel manifold 5 and the engine 3 to provide on demand a specific volume of fuel into the fuel manifold 5 inside the combustion chambers 2 of the engine 3; and a pilot unit for the injectors able to control the opening and closing of the injectors 8 in accordance with engine operating conditions 3.
  • the number of injectors 8 is equal to the number of combustion chambers 2 present in the engine 3, and the piloting unit for the injectors is integrated in the control unit 9 of the engine 3, to which the whole of the management of the engine 3 is delegated.
  • the supply arrangement 1 finally comprises a recirculation circuit 10, connecting upstream of the fuel manifold 5, the output 7a of the pumping 7 unit with the intake 7b of the pumping unit 7, and a control means 11 for the fuel flow along the recirculation duct 10.
  • the said control arrangement regulating the fuel flow along the recirculation duct 10, is able to regulate the pressure of the fuel within the fuel manifold 5.
  • the recirculation duct 10 can also directly connect the output 7a and the intake 7b of the pumping unit 7 in an indirect manner, for instance bringing in communication the output 7a from the pumping unit 7 with the reservoir 6 which in turn, is connected with the intake 7b of the pumping unit 7 itself.
  • the control arrangement 11 comprises a solenoid valve 12 for controlled opening and closing located along the recirculation duct 10, and a pilot unit for the solenoid valve able to control the opening and closing of the solenoid valve 12 in accordance with the pressure of fuel in the corresponding output 7a of the pumping unit 7, and to the inside of the fuel manifold 5.
  • the pilot unit of the solenoid valve 12 is integrated with the control unit 9 of the engine 3 and can eventually be provided with a pressure sensor (not illustrated) to detect the fuel pressure according to the output 7a of the pumping unit 7; whereas the solenoid valve 12 consists of an injector 12 of known type located with its atomizer jet 12a turned towards the output 7a of the pumping unit 7, and with its closure 12b turned towards the intake 7b of the pumping unit 7.
  • the supply arrangement 1 also comprises an intake pumping unit 13 interposed between the reservoir 6 and the pumping unit 7.
  • the said intake pumping unit 13 is designed to provide fuel to the pumping unit 7, the latter not being able to draw fuel directly from the reservoir 6.
  • the pumping unit 7 is a mechanical pump of the volumetric type supplying to the output a pressure complying with the sinusoidal pattern shown in Figure 2, effecting three outputs for each two engine rotations. It is also assumed that the said mechanical pump, indicated below by number 7, is directly driven by the engine 3, in consequence whereof the pilot unit of the solenoid valve or the control unit 9, is able to follow the pattern in time of fuel pressure at the output 7a knowing the position of the engine shaft 3. Obviously in this case, the pressure sensor detecting the pressure on output 7a from the pump 7 is not necessary.
  • the solenoid valve pilot unit, or the control unit 9 synchronises opening and closing of the injector 12 with the operation in time of pressure of the output from the pump 7, in such a way as to reduce the propagation of pressure peaks within the fuel manifold 5.
  • the solenoid valve pilot unit or the control unit 9 places in communication the output 7a and the intake 7b of the pump 7 when the fuel pressure to the output 7a has reached its maximum value, in such a manner as to discharge the pressure peak upstream of the pump 7, and obtain inside the fuel manifold 5 the timing pattern of pressure illustrated in Figure 4.
  • the pilot unit of the solenoid valve, or the control unit 9, opens the control unit 9, opens the injector 12 at each maximum pressure value for a timed interval Ta of specific magnitude.
  • the time interval Ta is preferably, though not necessarily centred upon the moment at which the pressure assumes its maximum value, and its amplitude is varied by the solenoid valve pilot unit, or the control unit 9, in accordance with the pressure required to be maintained in the fuel manifold 6 and/or other operating parameters of the engine 3.
  • the pattern of fuel average pressure in the fuel manifold 5 according to the amplitude of the time interval Ta is illustrated in Figure 5.
  • the supply arrangement 1 has the notable advantage of reducing considerably the length of the recirculation duct 10, greatly facilitating the positioning within the engine compartment.
  • the reduced length of the recirculation duct 10 also greatly reduces the overall manufacturing costs of the supply arrangement 1.
  • a further advantage of the supply arrangement 1 is that this allows a more accurate regulation of fuel pressure within the fuel manifold 5, thus considerably improving fuel atomising within the combustion chamber 2 or the intake ducts 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP99106831A 1998-04-06 1999-04-06 Fuel supply arrangement to at least one combustion chamber of an internal combustion engine Withdrawn EP0949416A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO980221 1998-04-06
IT98BO000221A IT1299956B1 (it) 1998-04-06 1998-04-06 Dispositivo di alimentazione del carburante ad almeno una camera di combustione di un motore a scoppio.

Publications (1)

Publication Number Publication Date
EP0949416A1 true EP0949416A1 (en) 1999-10-13

Family

ID=11343092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99106831A Withdrawn EP0949416A1 (en) 1998-04-06 1999-04-06 Fuel supply arrangement to at least one combustion chamber of an internal combustion engine

Country Status (3)

Country Link
EP (1) EP0949416A1 (it)
BR (1) BR9901593A (it)
IT (1) IT1299956B1 (it)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459429A1 (en) * 1990-05-29 1991-12-04 Toyota Jidosha Kabushiki Kaisha Fuel injector
EP0474168A1 (en) * 1990-08-31 1992-03-11 Yamaha Hatsudoki Kabushiki Kaisha High pressure fuel injection system for an internal combustion engine
EP0656471A2 (de) * 1993-10-28 1995-06-07 Siemens Aktiengesellschaft Vorrichtung zur Reduzierung der Kraftstofftemperatur im Tank eines Kraftfahrzeuges
US5697343A (en) * 1996-07-08 1997-12-16 Mitsubishi Denki Kabushiki Kaisha Fuel injector system
FR2764003A1 (fr) * 1997-06-02 1998-12-04 Magneti Marelli France Purge d'une rampe d'injecteurs d'un moteur a injection directe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459429A1 (en) * 1990-05-29 1991-12-04 Toyota Jidosha Kabushiki Kaisha Fuel injector
EP0474168A1 (en) * 1990-08-31 1992-03-11 Yamaha Hatsudoki Kabushiki Kaisha High pressure fuel injection system for an internal combustion engine
EP0656471A2 (de) * 1993-10-28 1995-06-07 Siemens Aktiengesellschaft Vorrichtung zur Reduzierung der Kraftstofftemperatur im Tank eines Kraftfahrzeuges
US5697343A (en) * 1996-07-08 1997-12-16 Mitsubishi Denki Kabushiki Kaisha Fuel injector system
FR2764003A1 (fr) * 1997-06-02 1998-12-04 Magneti Marelli France Purge d'une rampe d'injecteurs d'un moteur a injection directe

Also Published As

Publication number Publication date
IT1299956B1 (it) 2000-04-04
ITBO980221A0 (it) 1998-04-06
BR9901593A (pt) 2000-01-04
ITBO980221A1 (it) 1999-10-06

Similar Documents

Publication Publication Date Title
US7784447B2 (en) Fuel injection system comprising a high-pressure variable-delivery pump
JPH09324712A (ja) 船外機の電子制御式燃料供給装置
EP0643801B1 (en) Water introduction in internal combustion engines
RU2104407C1 (ru) Способ управления работой топливной системы, топливная система для двигателя внутреннего сгорания
KR19990083424A (ko) 내연기관의연료공급장치
US6453877B1 (en) Fuel delivery system using two pressure regulators with a single electric fuel pump
US5113829A (en) Two cycle internal combustion engine
US6318344B1 (en) Dead-headed fuel delivery system using a single fuel pump
EP0964150A3 (en) Fuel injection system for internal combustion engine
US9175650B2 (en) High-pressure fuel pump for an internal combustion engine with direct injection
US9903321B2 (en) Apparatus and method for operating a plurality of hydraulic pumps
US4953515A (en) Diesel engine secondary fuel injection system
RU2177078C2 (ru) Способ нагнетания давления в системе впрыска топлива, относящейся по типу к системам газового впрыска
US20190120149A1 (en) Dual-fuel fuel injection system for an internal combustion engine
US7222611B2 (en) Fuel supply apparatus and fuel pressure regulating method for internal combustion engine
EP1865193B1 (en) Fuel injection system for an internal combustion engine
KR100427844B1 (ko) 액화 가스용 연료 시스템
GB2579643A (en) A heat exchanger for a water injection system, a system, a control system, a method and a vehicle
EP0949416A1 (en) Fuel supply arrangement to at least one combustion chamber of an internal combustion engine
US5615643A (en) Fuel pumps for internal combustion engines
US4202308A (en) Internal combustion engine system
EP2038537B1 (en) System for injecting liquid vapour
JP2001115916A (ja) ジメチルエーテル用ディーゼルエンジン
KR20130066008A (ko) Ｌｐｉ 연료 충전 장치
RU2425248C2 (ru) Импульсная система топливоподачи дизеля

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): DE ES FR GB SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19991210

AKX Designation fees paid

Free format text: DE ES FR GB SE

17Q First examination report despatched

Effective date: 20020613

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20021024