EP1077327B1 - Einspritzanlage für eine Brennkraftmaschine, insbesondere für eine Common-Rail-Einspritzanlage - Google Patents
Einspritzanlage für eine Brennkraftmaschine, insbesondere für eine Common-Rail-Einspritzanlage Download PDFInfo
- Publication number
- EP1077327B1 EP1077327B1 EP00117170A EP00117170A EP1077327B1 EP 1077327 B1 EP1077327 B1 EP 1077327B1 EP 00117170 A EP00117170 A EP 00117170A EP 00117170 A EP00117170 A EP 00117170A EP 1077327 B1 EP1077327 B1 EP 1077327B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- injection system
- pressure pump
- distribution element
- cylinders
- 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
Links
- 238000002347 injection Methods 0.000 title claims description 35
- 239000007924 injection Substances 0.000 title claims description 35
- 238000002485 combustion reaction Methods 0.000 title claims description 11
- 239000000446 fuel Substances 0.000 claims description 38
- 239000002828 fuel tank Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Images
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
- 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
Definitions
- the invention relates to an injection system for an internal combustion engine, especially for a common rail injection system, with a pre-feed pump for conveying Fuel from a fuel tank; one downstream behind the pre-feed pump arranged high pressure pump for generation that is required to supply at least one injector Injection pressure and one between the pre-feed pump and the controllable valve arranged for the high pressure pump Control of the fuel flow supplied to the high pressure pump; the controllable valve to avoid throttling effects between an open position and a closed position Position essentially switchable seamlessly is; the high pressure pump has several pump cylinders.
- Generic injection systems are, for example, from the WO 95/13474 A known.
- the disadvantage was that a throttling between the Prefeed pump and the high pressure pump a pronounced speed dependency had, so that the servo valve depending of the speed had to be readjusted.
- the throttling required a larger form of the Pre-feed pump, so that a relatively large pre-feed pump is necessary was.
- WO 96/13474 known, instead of a continuously controllable servo valve an essentially seamless 2/2-way valve to use. Such an injection system sets however, a relatively high pre-delivery pressure ahead.
- the present invention has for its object a To create injection system in which to control the Injection pressure as little fuel as possible from the outlet of the High pressure pump must be recycled and beyond the lowest possible form is required.
- the task is based on that described above known injection system, by the features of claim 1 solved.
- the invention builds on the generic injection system characterized in that between the controllable valve (7) and the High pressure pump (4) a continuously switchable distributor element (10) is arranged, that of the pre-feed pump (1) Fuel flow to the individual pump cylinders (4.1 to 4.3) of the high pressure pump (4).
- the distributor element from several switchable valves, each upstream of one of the pump cylinders of the high pressure pump are to fuel the individual pump cylinders to supply; preferably the switchable valves of the Distribution element, the inlet valves of the pump cylinder High pressure pump.
- the switchable valves of the distributor element also take over the function of the inlet valves of the pump cylinders, can advantageously dispense with separate inlet valves become.
- the invention advantageously includes the general technical Teach in between the pre-feed pump and the high pressure pump instead of a continuously controllable servo valve, for example to arrange a 2/2-way valve, which is a throttle-free Control of fuel flow with a correspondingly low Form enables.
- the distributor element is designed as a rotary valve which is, for example, firmly connected to the drive shaft is and the fuel flow speed synchronized to the individual pump cylinder distributed.
- the common rail injection system shown in Figure 1 has a pre-feed pump 1 on the fuel via a Fuel filter 2 from a fuel tank 3 promotes and on a high-pressure pump 4, which for fuel injection required in the combustion chamber of an internal combustion engine Injection pressure generated.
- the high pressure pump 4 is here as a radial piston pump with three pistons and three pump cylinders 4.1, 4.2, 4.3 executed and is via a drive shaft 5 driven, which is fixed to the drive shaft of the Internal combustion engine is coupled.
- the high-pressure pump 4 with a pressure accumulator is on the output side 6 (English Common Rail) connected, from the four injectors are supplied with fuel, the four injectors for Simplification are not shown.
- the minimum duration is one Switching cycle of the 2/2-way valve 7 is small enough for that 2/2-way valve 7 the duration of the suction periods of each Pump cylinder 4.1-4.3 can affect.
- Switching cycle is the time interval between opening and understanding the 2/2-way valve 7 to understand.
- the mechanical Control of the 2/2-way valve 7 is therefore preferably carried out by a fast piezoelectric actuator 9, however, an appropriately sized electromagnetic can also be used Use the actuator.
- a distributor element 10 is arranged, which from the prefeed pump 1 delivered fuel flow to the three pump cylinders 4.1 to 4.3 of the high pressure pump 4 distributed, the Distributor element 10 from three switchable valves 10.1 to 10.3, each of one of the pump cylinders 4.1 to 4.3 are upstream.
- the valves 10.1 to 10.3 are here coupled switchable, so that only one of the valves 10.1 to 10.3 opens while the other two valves are closed are. Instead, there is also the option of to use three independently switchable valves.
- valves 10.1 to 10.3 of the distributor element 10 at the same time as inlet valves the high pressure pump 4 act, so that on separate inlet valves can be dispensed with.
- They are preferred Valves 10.1 to 10.3 of the distributor element also as 2/2-way valves formed between an open and a closed position essentially seamless are switchable. Alternatively, however, can also be controlled continuously Servo valves are used for the distributor element.
- the control of the valves 10.1 to 10.3 of the distributor element 10 also takes place in this exemplary embodiment by the electronic control unit 8 as follows is described in detail.
- the electronic control unit 8 is also on the input side a tachometer 11 connected to the speed n of the drive shaft 5 measures so that the 2/2-way valve 7 and the valves 10.1 to 10.3 of the distributor element 10 depending driven by the speed n of the drive shaft 5 can.
- the electronic control unit 8 is on the input side connected to a phase detector 12 which detects the angle of rotation ⁇ the drive shaft 5 of the high pressure pump 4 is detected by a phase-dependent control of the 2/2-way valve 7 and the valves 10.1 to 10.3 of the distributor element 10.
- the Tachometer 11 or the phase detector 12 also with the drive shaft the internal combustion engine or with another Be connected to the wave, which has a unique phase relationship the drive shaft 5 of the high pressure pump 4.
- this Fall is the speed or phase of the drive shaft 5 of the high pressure pump 4 from the measured values of the tachometer 11 and the phase detector 12 is calculated.
- control unit 8 opens the 2/2-way valve 7, so that the delivered by the pre-feed pump 1 Fuel flow reaches the high-pressure pump 4 unhindered.
- control unit 8 closes the 2/2-way valve 7 at predetermined time intervals T for each a predetermined period of time ⁇ T, resulting in less fuel comes to the high pressure pump 4.
- the time intervals T and the The closing time ⁇ T can be varied.
- control unit 8 also controls the valves 10.1 to 10.3 of the distributor element 10, wherein the control of the valves 10.1 to 10.3 so that any manufacturing-related differences in delivery performance between the individual pump cylinders 4.1 to 4.3 are compensated. If, for example, the pump cylinder 4.1 is due to production has a lower pumping capacity than the pump cylinders 4.2 and 4.3, the associated valve of the pump cylinder 4.1 open for a longer period of time, causing the Suction phase of the pump cylinder 4.1 extended and the pumping power is improved accordingly. Leave this way through a suitable control of the valves 10.1 to 10.3 achieve extremely even fuel delivery and reduce pressure pulsations in the pressure accumulator 6.
- FIG. 2 The exemplary embodiment shown in FIG. 2 is largely correct with the embodiment described above agree, so that in the following largely the same reference numerals be used and to avoid repetitions will refer to the description above.
- the difference compared to the embodiment shown in Figure 1 consists essentially in the execution of the distributor element 10, which in this case consists of a rotary valve consists of the drive shaft 5 of the internal combustion engine is driven and that promoted by the prefeed pump 1 Fuel flow synchronous to speed and evenly on the three Pump cylinder 4.1 to 4.3 distributed.
- the distributor element 10 which in this case consists of a rotary valve consists of the drive shaft 5 of the internal combustion engine is driven and that promoted by the prefeed pump 1 Fuel flow synchronous to speed and evenly on the three Pump cylinder 4.1 to 4.3 distributed.
- the invention is not limited in its implementation the preferred embodiments given above. Rather, a number of variants are conceivable, which of the solution shown, even if fundamentally different Makes use of explanations.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- Figur 1
- als bevorzugtes Ausführungsbeispiel der Erfindung eine Einspritzanlage mit einem 2/2-Wegeventil zwischen Vorförderpumpe und Hochdruckpumpe und einem Verteilerelement mit drei schaltbaren Ventilen zur Verteilung des Kraftstoffstroms auf die Pumpzylinder der Hochdruckpumpe; sowie
- Figur 2
- ein weiteres Ausführungsbeispiel einer Einspritzanlage mit einem mechanisch betriebenen Drehschieber zur Verteilung des Kraftstoffstroms auf die Pumpzylinder.
Claims (11)
- Einspritzanlage für eine Brennkraftmaschine, insbesondere für eine Common-Rail-Einspritzanlage, mitdadurch gekennzeichnet, dasseiner Vorförderpumpe (1) zur Förderung von Kraftstoff aus einem Kraftstofftank (3),einer stromabwärts hinter der Vorförderpumpe (1) angeordneten Hochdruckpumpe (4) zur Erzeugung des zur Speisung von mindestens einem Injektor erforderlichen Einspritzdrucks undeinem zwischen der Vorförderpumpe (1) und der Hochdruckpumpe (4) angeordneten steuerbaren Ventil (7) zur Steuerung des der Hochdruckpumpe (4) zugeführten Kraftstoffstroms, wobeidas steuerbare Ventil (7) zur Vermeidung von Drosseleffekten zwischen einer geöffneten Stellung und einer geschlossenen Stellung im wesentlichen übergangslos schaltbar ist; und wobeidie Hochdruckpumpe (4) mehrere Pumpzylinder (4.1 bis 4.3) aufweist;
zwischen dem steuerbaren Ventil (7) und der Hochdruckpumpe (4) ein stufenlos schaltbares Verteilerelement (10) angeordnet ist, das den von der Vorförderpumpe (1) geförderten Kraftstoffstrom auf die einzelnen Pumpzylinder (4.1 bis 4.3) der Hochdruckpumpe (4) verteilt. - Einspritzanlage nach Anspruch 1,
dadurch gekennzeichnet, daß das Verteilerelement (10) aus mehreren schaltbaren Ventilen (10.1 bis 10.3) besteht, die jeweils einem der Pumpzylinder (4.1 bis 4.3) der Hochdruckpumpe (4) stromaufwärts vorgeschaltet sind, um die einzelnen Pumpzylinder (4.1 bis 4.3) mit Kraftstoff zu versorgen. - Einspritzanlage nach Anspruch 1 oder 2
dadurch gekennzeichnet, daß die schaltbaren Ventile (10.1 bis 10.3) des Verteilerelements (10) die Einlaßventile der Pumpzylinder (4.1 bis 4.3) der Hochdruckpumpe (4) sind. - Einspritzanlage nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die einzelnen schaltbaren Ventile (10.1 bis 10.3) des Verteilerelements (10) unabhängig voneinander schaltbar sind, um fertigungsbedingte Ungleichheiten der Förderleistung der einzelnen Pumpzylinder (4.1 bis 4.3) kompensieren zu können. - Einspritzanlage nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, daß der minimale Schaltzyklus der schaltbaren Ventile (10.1 bis 10.3) des Verteilerelements (10) hinreichend kurz ist, um die Dauer der Saugphase der einzelnen Pumpzylinder (4.1 bis 4.3) beeinflussen zu können. - Einspritzanlage nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß der minimale Schaltzyklus des zwischen der Vorförderpumpe (1) und der Hochdruckpumpe (4) angeordneten steuerbaren Ventils (7) hinreichend kurz ist, um den Kraftstoffstrom jeweils selektiv und zeitlich begrenzt während der Saugphase der einzelnen Pumpzylinder (4.1 bis 4.3) freizugeben und dadurch fertigungsbedingte Ungleichheiten der Förderleistung der einzelnen Pumpzylinder (4.1 bis 4.3) zu kompensieren. - Einspritzanlage nach Anspruch 1,
dadurch gekennzeichnet, daß das Verteilerelement (10) ein Drehschieber ist. - Einspritzanlage nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß das steuerbare Ventil (7) und/oder das Verteilerelement (10) eingangsseitig mit einer elektronischen Steuereinheit (8) verbunden sind. - Einspritzanlage nach Anspruch 8,
dadurch gekennzeichnet, daß zur Bestimmung der Drehzahl der Hochdruckpumpe (4) ein Drehzahlmesser (11) vorgesehen ist, wobei der Drehzahlmesser (11) ausgangsseitig mit der elektronischen Steuereinheit (8) verbunden ist, die das steuerbare Ventil (7) und/oder das Verteilerelement (10) drehzahlabhängig ansteuert. - Einspritzanlage nach Anspruch 8 oder 9,
dadurch gekennzeichnet, daß zur Bestimmung der Phasenlage der Hochdruckpumpe (4) ein Phasendetektor (12) vorgesehen ist, wobei der Phasendetektor (12) ausgangsseitig mit der elektronischen Steuereinheit (8) verbunden ist, die das steuerbare Ventil (7) und/oder das Verteilerelement (10) phasenabhängig ansteuert. - Einspritzanlage nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß zur mechanischen Ansteuerung des steuerbaren Ventils (7) ein piezoelektrisches Stellglied (9) vorgesehen ist, um einen kurzen Schaltzyklus zu ermöglichen.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19938751A DE19938751A1 (de) | 1999-08-16 | 1999-08-16 | Einspritzanlage für eine Brennkraftmaschine, insbesondere für eine Common-Rail-Einspritzanlage |
| DE19938751 | 1999-08-16 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1077327A2 EP1077327A2 (de) | 2001-02-21 |
| EP1077327A3 EP1077327A3 (de) | 2003-05-14 |
| EP1077327B1 true EP1077327B1 (de) | 2004-10-20 |
Family
ID=7918525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00117170A Expired - Lifetime EP1077327B1 (de) | 1999-08-16 | 2000-08-10 | Einspritzanlage für eine Brennkraftmaschine, insbesondere für eine Common-Rail-Einspritzanlage |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1077327B1 (de) |
| DE (2) | DE19938751A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5701873A (en) * | 1993-11-08 | 1997-12-30 | Eidgenoessische Technische Hochschule Laboratorium Fuer Verbrennungsmotoren Und Verbrennungstechnik | Control device for a filling-ratio adjusting pump |
| DE19652831B4 (de) * | 1996-12-18 | 2011-02-24 | Continental Automotive Gmbh | Druckfluid-Speisesystem für die Versorgung von Hochdruck-Sammelleitungen |
| DE19742180C2 (de) * | 1997-09-24 | 1999-07-08 | Siemens Ag | Einspritzsystem für eine Brennkraftmaschine und Verfahren zum Regeln eines Einspritzsystems |
-
1999
- 1999-08-16 DE DE19938751A patent/DE19938751A1/de not_active Withdrawn
-
2000
- 2000-08-10 DE DE50008303T patent/DE50008303D1/de not_active Expired - Fee Related
- 2000-08-10 EP EP00117170A patent/EP1077327B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1077327A3 (de) | 2003-05-14 |
| DE19938751A1 (de) | 2001-03-01 |
| EP1077327A2 (de) | 2001-02-21 |
| DE50008303D1 (de) | 2004-11-25 |
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