EP0598650B1 - Brennstoffzufuhrvorrichtung mit belüfteten Einspritzdüsen - Google Patents

Brennstoffzufuhrvorrichtung mit belüfteten Einspritzdüsen Download PDF

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Publication number
EP0598650B1
EP0598650B1 EP93402759A EP93402759A EP0598650B1 EP 0598650 B1 EP0598650 B1 EP 0598650B1 EP 93402759 A EP93402759 A EP 93402759A EP 93402759 A EP93402759 A EP 93402759A EP 0598650 B1 EP0598650 B1 EP 0598650B1
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EP
European Patent Office
Prior art keywords
air
injectors
electrically controlled
valve
engine
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
EP93402759A
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English (en)
French (fr)
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EP0598650A1 (de
Inventor
Michael Pontoppidan
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Marelli France SAS
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Magneti Marelli France SAS
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Application filed by Magneti Marelli France SAS filed Critical Magneti Marelli France SAS
Publication of EP0598650A1 publication Critical patent/EP0598650A1/de
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    • 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
    • F02M69/30—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines
    • F02M69/32—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines with an air by-pass around the air throttle valve or with an auxiliary air passage, e.g. with a variably controlled valve therein
    • 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
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M69/30—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines

Definitions

  • the invention relates to electronically controlled fuel injection supply devices for an internal combustion engine, comprising electrically controlled injectors.
  • each engine combustion chamber is provided with an injector which opens into the manifold in the vicinity of the corresponding intake valve.
  • the invention relates more particularly to supply devices of the type comprising electrically controlled injectors, an electronic unit controlling the injectors as a function of engine operating parameters, and a throttle body whose throttle is controlled by the driver, each injector comprising a body provided with fixing means in a housing opening into the tubing and a nose pierced with at least one fuel outlet passage, delimiting a mixing chamber connected to a supply of aeration air.
  • EP-A-0 357 4908 injection devices, the injector of which includes a chamber provided with an aeration air inlet. Generally, the air supplied to the injectors is drawn from the air inlet of the supply device. Aeration improves the spraying of the fuel supplied by the injector.
  • a variant is also known (EP-A-0 409 170) where the flow of additional air taken upstream of the throttle valve and delivered to each injector is controlled by a three-way idle solenoid valve also acting as idle speed regulator.
  • document JP-A-57 157 058 describes a supply device according to the preamble of claim 1, comprising an additional air duct branched so as to supply the air necessary for spraying the fuel from each of the injectors, namely the normal running injectors and a cold start injector.
  • the connection to the starter injector is only open when the starter injector is operating.
  • injection fueling devices are known, the butterfly of which makes it possible to close the intake duct almost completely, having an additional air duct whose inlet is located upstream of the butterfly and where the flow rate is adjustable. by a solenoid valve.
  • the air solenoid valve is controlled by the electronic unit according to engine operating parameters, for example the throttle opening and the engine speed for regulating the idle speed, the water temperature and the speed of the engine. engine for cold start.
  • the box thus makes it possible to facilitate the cold starting of the engine, to regulate the idling speed and to facilitate the transitions in deceleration.
  • the present invention aims to provide a fuel supply device for ensuring better spraying when the engine is operating in modes other than full load, and in particular when actuated at very low temperature (running at cold), decelerating at high speed and during reduced loads.
  • the invention proposes to use for this purpose additional air at a regulated flow rate. It therefore proposes a supply device according to the characterizing part of claim 1.
  • the device does not include an additional injector intended to supply fuel during cold departures.
  • the additional solenoid valve will generally also be controlled by the electronic unit, often all or nothing.
  • the additional solenoid valve can in particular be opened during the cold start of the engine at very low temperature, which requires a much greater air flow than that which is capable of providing the ventilation network comprising the distributor, the channels air supply to injectors and mixing chambers.
  • the additional solenoid valve will also be open when the engine is hot, its speed is high and the engine acts as a brake, throttle closed.
  • a high air flow rate often around 60 to 70 kg per hour in the case of a medium-displacement vehicle, is therefore then necessary to avoid damaging the catalyst. This flow rate is much higher than that which can pass through the spray diaphragm generally provided in the injectors.
  • the additional solenoid valve will be dimensioned so that the maximum flow that can pass through it is between 2.5 and 4 times the maximum flow (limited by a sonic neck effect) that can pass through the injectors mixing chamber. .
  • the maximum flow rate of the additional solenoid valve will be approximately three times the maximum flow rate of the four injectors.
  • the serial arrangement of the additional air solenoid valve and the additional solenoid valve on the upstream path downstream of the butterfly valve eliminates the problems that would arise from the installation of two separate circuits, one supplying the injectors and provided with the additional air solenoid valve, the other going directly from upstream to downstream and comprising only the additional valve.
  • the additional solenoid valve should be provided so as to have only minimal leaks in the closed position. so as not to disturb the operation of the engine at idle or at low load.
  • the invention also aims to provide a device limiting the pumping effects and the accumulation of fuel in the injectors mixing chamber, during an operation characterized by a pressure gradient between the intake manifold and the mixing chamber. below the sonic value.
  • the mixing chamber comprises a half-ring supplied in its central part by the air inlet and a diametral passage crossed by the jet or the jets. of fuel.
  • the jets will generally be thin and will have little divergence, at least outside of the air spray regime.
  • the injection is with two jets of divergent axes, placed in the median plane of said diametrical passage. In all cases where the injection is with several jets, these jets are each contained in a plane including the axis of the respective valve.
  • the system whose general constitution is shown in Figure 1 is of the kind described in patent FR 89 04 287 to which reference may be made.
  • This device comprises an air supply circuit on which is interposed a throttle body 8.
  • a throttle valve 10 controlled by the conductor and provided with an opening sensor 12 providing an output signal representative of the opening angle.
  • the butterfly body 8 shown is double and includes two butterflies controlled simultaneously, but this arrangement is not exclusive.
  • the engine air supply circuit comprises, downstream of the body 8, a manifold 14 with several branches each opening upstream of the intake valve 16 of a combustion chamber of the engine.
  • An additional air duct 18 provided with an electrically controlled valve 20 makes it possible, during certain phases of operation, and in particular at start-up, while the butterfly 10 (or each of the butterflies 10) is closed, to bring towards the air motor which bypasses the throttle body 8.
  • the butterfly valve 10 is intended to close the intake duct almost completely when it is in its minimum open position.
  • a fuel supply circuit includes an electric pump 26 which supplies, via a filter 30 and a ramp 32, injectors 34 of which only one is shown. These injectors are arranged immediately upstream of the intake valves 16. The injectors 34 are controlled by an electronic unit 46 supplied by the storage battery 48 as soon as the ignition contact 50 is closed.
  • the air pressure sensors in the manifold and the throttle opening enable the air flow admitted to the engine to be calculated: they can be replaced by a direct air flow measurement element.
  • the electronic unit 46 supplies the injector 34 or each injector with opening pulses synchronized with the control of the corresponding intake valve 16 and the duration of which depends on the operating parameters.
  • each injector 34 has an aeration chamber.
  • the injector 34 comprises a rear body 46 connected to the fuel supply rail 32 and a nose 50.
  • O-rings 52 carried by the noses bear against the wall of the passage formed in the tubing 14 and separate the tubing from the ambient atmosphere.
  • In the nose is provided at least one fuel spouting channel closable by a valve whose movements are controlled by an electromagnetic coil housed in the body and supplied by the housing 46.
  • the nozzle 50 of the injector is also pierced with one or more air / fuel mixture outlet openings coming from a mixing chamber 58 placed downstream of the channel or spouting channels.
  • This chamber is supplied with air through a passage 56 of the tubing, opening between the two O-rings.
  • the chamber consists of an annular channel 60, semi-circular, placed so as to receive the air in the middle and of a diametral channel 62.
  • the passage 56 communicates with the outlet 48 of the solenoid valve 20 via a line 70 and the distributor 68 and a general line 66.
  • the electronic unit 46 can be programmed so as to allow an air flow to remain towards the aeration chambers of the injectors even when the butterfly valve is at full opening, so as to maintain a flow of fresh air which sweeps the nose of injector and cools it.
  • the injector is designed to supply two divergent fuel jets, each passing through a hole 72 in a transverse partition of the diaphragm body, these two jets will generally be formed so as to place themselves in the median plane of the diametral channel 62, which also contains the axis of the injector.
  • valves It is possible to provide one and / or the other of the valves with a progressive effect actuator instead of an all or nothing actuator.
  • actuators can in particular be inductive or of the stepping motor type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (6)

  1. Brennstoff-Einspritzvorrichtung für einen Verbrennungsmotor mit mehreren elektrisch gesteuerten Einspritzdüsen (34), die mehrere Verbrennungskammern versorgen, einem Elektronikgehäuse (46), das die Einspritzdüsen als Funktion von Funktionsparametern des Motors steuert, einem Stellklappenkörper (8), dessen Stellklappe (10) durch den Leiter gesteuert ist, wobei jede Einspritzdüse einen Körper aufweist, der mit einer Halterungseinrichtung in einer Aufnahme versehen ist, die in den Rohrstutzen mündet, und mit einer Nase, die von wenigstens einem Brennstoffauslaß durchsetzt ist, und eine Mischkammer begrenzt, die mit einem Belüftungseinlaß verbunden ist, und einer Zusatzluftleitung (18), deren Einlaß stromauf von der Stellklappe angeordnet ist, wo der Durchsatz durch ein Elektroventil (20) steuerbar ist, und die Luft, die das Elektroventil für die Zusatzluft durchströmt hat, zu der Mischkammer von jeder der Einspritzdüsen und zu einem Hilfselektroventil (74) leitet, das stromab von der Stellklappe (10) mündet, wobei das Hilfselektroventil durch das elektronische Gehäuse gesteuert wird, das beim Kaltstart des Motors bei sehr niedriger Temperatur öffnet,
    dadurch gekennzeichnet, daß der Stellklappenkörper dazu vorgesehen ist, daß die Stellklappe die Zuströmleitung in ihrer Position minimaler Öffnung praktisch vollständig verschließt, und daß das Gehäuse außerdem das Hilfselektroventil öffnet, wenn der Motor warm ist, sich mit hoher Drehzahl dreht und bei geschlossener Stellklappe als Bremse wirkt.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie einen Verteiler (68) aufweist, der es erlaubt, daß Luft verteilt wird, die das Elektroventil zwischen den Einspritzdüsen (34) durchströmt hat.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Mischkammer eine Ringhälfte (60) aufweist, die in ihrem zentralen Teil durch den Lufteinlaß gespeist wird, und einen diametralen Durchlaß (62), der durch den Brennstoffstrahl oder die Brennstoffstrahlen durchsetzt ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Einspritzung mit zwei dünnen Strahlen erfolgt, deren Achsen fächerförmig auseinanderlaufen, und die in der Medianebene des diametralen Durchlasses angeordnet sind.
  5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Einspritzung mit mehreren Strahlen erfolgt, die jeweils in einer Ebene enthalten sind, welche die Achse eines jeweiligen Ventils einschließt.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Hilfselektroventil derart bemessen ist, daß es einen Durchsatz erlaubt, der zwischen dem 2,5- und dem 4-fachen des Maximaldurchsatzes liegt, der die Mischkammern der Einspritzdüsen durchströmen kann.
EP93402759A 1992-11-16 1993-11-12 Brennstoffzufuhrvorrichtung mit belüfteten Einspritzdüsen Expired - Lifetime EP0598650B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9213750 1992-11-16
FR9213750A FR2698128B1 (fr) 1992-11-16 1992-11-16 Dispositif d'alimentation en combustible à injecteurs aérés.

Publications (2)

Publication Number Publication Date
EP0598650A1 EP0598650A1 (de) 1994-05-25
EP0598650B1 true EP0598650B1 (de) 1997-02-12

Family

ID=9435572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402759A Expired - Lifetime EP0598650B1 (de) 1992-11-16 1993-11-12 Brennstoffzufuhrvorrichtung mit belüfteten Einspritzdüsen

Country Status (6)

Country Link
US (1) US5392746A (de)
EP (1) EP0598650B1 (de)
JP (1) JPH06235370A (de)
DE (1) DE69308106T2 (de)
ES (1) ES2097473T3 (de)
FR (1) FR2698128B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3353416B2 (ja) * 1993-11-01 2002-12-03 株式会社デンソー 内燃機関の燃料制御装置
US5722375A (en) * 1995-05-10 1998-03-03 Nally; Debora Extended tip air assist fuel injector
GB2305215A (en) * 1995-09-13 1997-04-02 Rover Group Spark ignition engine air induction and fuel injection system
US5666927A (en) * 1996-07-26 1997-09-16 Siemens Automotive Corporation Fuel/air supply system for a fuel injector and methods of operation
JP3896813B2 (ja) * 2001-08-31 2007-03-22 トヨタ自動車株式会社 筒内噴射式内燃機関の燃料噴射装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57157058A (en) * 1981-03-23 1982-09-28 Toyota Motor Corp Air assisting device for electronically controlled fuel injection type internal-combustion engine
JPS58190562A (ja) * 1982-04-30 1983-11-07 Toyota Motor Corp 内燃機関の燃料供給装置
JPS59119053A (ja) * 1982-12-25 1984-07-10 Nippon Soken Inc 燃料霧化用二次空気の供給装置
JPS59131575U (ja) * 1983-02-23 1984-09-04 トヨタ自動車株式会社 電子制御機関用燃料噴射弁
US4700679A (en) * 1985-05-29 1987-10-20 Honda Giken Kogyo K.K. Intake air quantity control method for internal combustion engines
IT1184957B (it) * 1985-06-04 1987-10-28 Weber Spa Sistema di alimentazione di carburante all avviamento di un motore endotermico comprendente un sistema di iniezione elettronica
JP2632380B2 (ja) * 1988-08-03 1997-07-23 本田技研工業株式会社 内燃エンジンのバイパス空気量制御装置
US5035358A (en) * 1989-03-22 1991-07-30 Toyota Jidosha Kabushiki Kaisha Fuel injector for use in an engine
DE4041628A1 (de) * 1990-12-22 1992-07-02 Daimler Benz Ag Gemischverdichtende brennkraftmaschine mit sekundaerlufteinblasung und mit luftmassenmessung im saugrohr
US5220900A (en) * 1991-02-07 1993-06-22 Siemens Automotive L.P. Air assist atomizer for fuel injector
JP2727780B2 (ja) * 1991-03-26 1998-03-18 トヨタ自動車株式会社 内燃機関の吸気制御装置
JP3053934B2 (ja) * 1991-10-31 2000-06-19 愛三工業株式会社 多孔式インジェクタ

Also Published As

Publication number Publication date
EP0598650A1 (de) 1994-05-25
FR2698128B1 (fr) 1995-01-27
DE69308106T2 (de) 1997-08-28
DE69308106D1 (de) 1997-03-27
US5392746A (en) 1995-02-28
ES2097473T3 (es) 1997-04-01
FR2698128A1 (fr) 1994-05-20
JPH06235370A (ja) 1994-08-23

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