EP0960275B1 - Hochdruckpumpe zur kraftstoffversorgung bei kraftstoffeinspritzsystemen von brennkraftmaschinen - Google Patents
Hochdruckpumpe zur kraftstoffversorgung bei kraftstoffeinspritzsystemen von brennkraftmaschinen Download PDFInfo
- Publication number
- EP0960275B1 EP0960275B1 EP98966148A EP98966148A EP0960275B1 EP 0960275 B1 EP0960275 B1 EP 0960275B1 EP 98966148 A EP98966148 A EP 98966148A EP 98966148 A EP98966148 A EP 98966148A EP 0960275 B1 EP0960275 B1 EP 0960275B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure pump
- pump
- high pressure
- valve
- 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
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
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
- F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
Definitions
- the invention relates to a high pressure pump according to the Preamble of claim 1.
- the advance described type is usually independent of need a constant fuel flow through the pre-feed pump in Individual elements of the high pressure pump are promoted.
- the individual elements of the high pressure pump can, for example be several cylinders, each with a piston back and forth is moved to suck in the fuel and with To apply high pressure. If regardless of need constant speed-dependent fuel flow from the High pressure pump pumped into the common manifold , it means that the power consumption of the High pressure pump is constant even when demand drops. The affects the overall efficiency of the Internal combustion engine. Furthermore, the excess, fuel quantity compressed to high pressure again from the High pressure pump can be shut down, too Temperature increases in the fuel leads.
- From US 5,626,114 is a radial piston high pressure pump where a high pressure side pressure control for everyone Pump elements through a pressure control valve of a valve unit is made.
- This valve unit consists of a 2/2-way valve with an upstream throttle and a pressure control valve arranged in parallel.
- This valve unit is on the high pressure side Distribution rail (common rail) and a bypass line of Distribution board connected.
- the low pressure side is the Valve unit with an unpressurized return line connected.
- the 2/2-way valve is at the start of the engine opened so that the high pressure area of the Fuel injection system with the pressure of the pre-feed pump is applied. As soon as the internal combustion engine is running, the 2/2-way valve is closed. In closed The state of the 2/2-way valve takes over in parallel switched pressure control valve the pressure control of the Rail. This means that the high pressure pump always against the one prevailing in the distribution strip High pressure promotes what the aforementioned disadvantages in terms of overall efficiency and fuel heating Has.
- EP 0 459 429 A1 describes a high-pressure pump with a Pump element known between the high pressure side and Low pressure side of the pump element a flow valve is provided. This flow valve is controlled so that the desired flow rate to the high pressure side is promoted. The excess fuel is over the Low pressure side returned to the fuel tank.
- the disadvantage of this flow rate regulation is that for each pump element requires a flow valve, and that the excess fuel in the pump element first pressurized and then in the flow valve is relaxed. This leads to undesirable warming of the fuel and deteriorates the efficiency of the High pressure pump.
- a high pressure pump is also included in EP 0 481 964 A2 a pump element has been proposed in which the Filling the pump element and thus also its Flow rate is controlled by a 2/2-way solenoid valve.
- the 2/2-way valve can do the hydraulic connection between the low pressure side of the high pressure pump and the Release or close the pump element and thereby the Set the delivery rate of the high pressure pump.
- This Flow control is only possible on high pressure pumps transferable to several pump elements, if for each Pump element a 2/2-way valve is provided. Thereby the costs for the flow rate regulation increase with the Number of pump elements strongly.
- the invention is therefore based on the problem of a Provide high pressure pump which the above overcomes disadvantages mentioned. In particular, should Damage to the individual elements of the high pressure pump in the Operation can be avoided. In addition, one should be simple built high pressure pump can be created, the high Security requirements met and still inexpensive can be manufactured.
- the directional valve arranged according to the invention allows the Flow control of a high pressure pump with several Pump elements through a directional valve. This will cost saved in the manufacture of the high pressure pump. moreover the space of the high pressure pump is advantageous limited.
- the pressure in the common manifold can regulate to a desired setpoint.
- the high pressure pump serves as an actuator in the pressure control loop.
- the delivery rate control according to the invention also bears to improve overall engine efficiency because the The power consumption of the high-pressure pump drops as a result.
- the Demand quantity control according to the invention of the High-pressure pump-supplied fuel flow delivers about it furthermore the advantage that a partial filling of the individual pump elements of the high pressure pump, as in suction control occurs, is avoided. Thereby the risk of cavitation is reduced.
- the invention is characterized in that the directional valve is a 3/2-way valve which is installed in the common channel and the common channel in a first valve position with the common manifold and in a second Valve position with the low pressure part of the Fuel injection system connects.
- the fuel flow is depressurized again in the low pressure part of the fuel injection system without to be pressurized.
- the fuel flow can either be in the fuel tank or in the Connection line between the pre-feed pump and the High pressure pump can be returned. Because the total fuel flow conveyed through the high pressure pump can be divided into a flow and a Lubrication flow in the low pressure part is eliminated.
- a special embodiment of the invention is characterized in that between the directional valve and the common check manifold arranged a check valve is.
- the common channel is in the first valve position connected to the common manifold.
- Another special embodiment of the invention is characterized in that the directional valve is magnetic can be actuated. By the magnetic actuation of the Directional control valve can achieve short switching times.
- a Radial piston pump is one in a pump housing mounted drive shaft, which is eccentric or has cam-like elevations in the circumferential direction, and preferably several radial with respect to the drive shaft comprises pistons arranged in a respective cylinder space, by rotating the drive shaft in each Cylinder space can be moved back and forth in the radial direction are.
- Such radial piston pumps are especially for Suitable for common rail injection systems.
- the present invention generally has the advantage that it can be implemented simply and inexpensively.
- the basic idea of the present invention can also be found in simple way on conventional high pressure pumps be used because known components conventional high pressure pumps can be used. This increases the development effort and the cost risk kept low.
- Figure 1 shows a schematic representation of a Fuel injection system with an inventive High pressure pump, which is denoted overall by 1.
- a Pre-feed pump 2 delivers fuel 4 from a tank 3 through a fuel line 5 to the high pressure pump 1.
- Die High pressure pump 1 comprises three elements 6, 7, 8. The elements 6, 7, 8 are each formed by a cylinder in which a piston can move back and forth. If the in Figure 1 shown moving piston down Fuel drawn through the fuel line 5. If If the pistons move upwards, the Compressed fuel contained in cylinders and into one joint channel 10 promoted.
- a magnetically controlled 3/2-way valve 12 installed in the common channel 10 in the common channel 10 in the common channel 10 in the common channel 10.
- the fuel passes from the common channel 10 via a return 15 in the Fuel line 5.
- Figure 2 is the same fuel injection system as in Figure 1 shown. The only difference is that the valve is in a different position.
- the valve In the Position of the directional valve 12 shown in Figure 2 arrives the fuel from the common channel 10 into a channel 11, in which a check valve 13 is attached.
- the high-pressure pump 1 will continue to run out of fuel promoted the elements 6, 7, 8 in the channel 11 until the Pressure is so great that the check valve 13 opens. Then the high pressure fuel passes through a Line 14 in a common, not shown Rail.
- the high pressure pump shown in FIG. 3 is a radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines.
- the radial piston pump comprises one in a pump housing 20 mounted drive shaft 21 with an eccentric trained shaft section 22. On the eccentric A shaft 23 is provided opposite the shaft section 22 which the shaft section 22 is rotatable.
- the ring 23 includes several staggered flats against each other one piston 24 is supported.
- the pistons 24 are each in a cylinder space 25 to the drive shaft 21 in a radial Direction back and forth recorded.
- the foot of the Piston 24 is designed as a plate 26 on the ring 23 is present.
- the plate 26 is in each case by a cage 27 attached to the piston 24 and is supported by a spring 28 pressed against the ring 23.
- a check valve 35 ensures that that the fuel is not from the cylinder chamber 25 in the Fuel line 5 is promoted. Accordingly ensures a check valve 36 during the suction stroke for the Do not fuel from the common channel 10 in the Cylinder chamber 25 is sucked.
- the directional control valve 12 has a cylindrical shape Body 41 with a trumpet-shaped closure element 44. Openings 42, 43 are provided in the cylindrical body 41 intended. In the position shown in Figure 3 Directional control valve 12 can fuel from the common Channel 10 through openings 42, 43 in valve body 41 get into a channel 11. In channel 11 is a Check valve 13 attached.
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
- zeigt eine schematische Darstellung eines Kraftstoffeinspritzsystems mit einer Hochdruckpumpe und einem Wegeventil in einer ersten Ventilstellung;
- Figur 2
- zeigt eine schematische Darstellung des Kraftstoffeinspritzsystems aus Figur 1 mit dem Wegeventil in einer zweiten Ventilstellung; und
- Figur 3
- zeigt eine Ausführungsform einer erfindungsgemäßen Hochdruckpumpe.
Claims (4)
- Hochdruckpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, insbesondere ein Common-Rail-Kraftstoffeinspritzsystem, wobei die Hochdruckpumpe (1) Kraftstoff aus einem Niederdruckteil des Kraftstoffeinspritzsystems, der einen Kraftstofftank (3) und eine Vorförderpumpe (2) enthält, in eine gemeinsame Verteilerleiste des Kraftstoffeinspritzsystems fördert, wobei eine Bedarfsmengensteuerung (12) zur Steuerung des von der Hochdruckpumpe (1) geförderten Kraftstoffstroms in die Hochdruckpumpe (1) integriert ist, wobei die Hochdruckpumpe mehrere Pumpenelemente (6, 7, 8) aufweist, die mehreren Pumpenelemente (6, 7, 8) Kraftstoff in einen gemeinsamen Kanal (10) fördern, und die Bedarfsmengensteuerung ein Wegeventil (12) umfaßt, das den von der Hochdruckpumpe (1) geförderten Kraftstoffstrom, je nach Bedarf, entweder zu der gemeinsamen Verteilerleiste oder zu dem Niederdruckteil des Kraftstoffeinspritzsystems liefert, dadurch gekennzeichnet, daß das Wegeventil ein 3/2-Wegeventil (12) ist, das in dem gemeinsamen Kanal (10) angebracht ist und den gemeinsamen Kanal (10) in einer ersten Ventilstellung mit der gemeinsamen Verteilerleiste und in einer zweiten Ventilstellung mit dem Niederdruckteil des Kraftstoffeinspritzsystems verbindet.
- Hochdruckpumpe nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Wegeventil (12) und der gemeinsamen Verteilerleiste ein Rückschlagventil (13) angeordnet ist.
- Hochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Wegeventil (12) magnetisch betätigbar ist.
- Hochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Hochdruckpumpe eine Radialkolbenpumpe ist, die eine in einem Pumpengehäuse (20) gelagerte Antriebswelle (21), die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und vorzugsweise mehrere bezüglich der Antriebswelle (21) radial in einem jeweiligen Zylinderraum (25) angeordnete Kolben (24) umfaßt, die durch Drehen der Antriebswelle (21) in dem jeweiligen Zylinderraum (25) in radialer Richtung hin und her bewegbar sind.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19756087A DE19756087A1 (de) | 1997-12-17 | 1997-12-17 | Hochdruckpumpe zur Kraftstoffversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen |
DE19756087 | 1997-12-17 | ||
PCT/DE1998/003379 WO1999031383A1 (de) | 1997-12-17 | 1998-11-17 | Hochdruckpumpe zur kraftstoffversorgung bei kraftstoffeinspritzsystemen von brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0960275A1 EP0960275A1 (de) | 1999-12-01 |
EP0960275B1 true EP0960275B1 (de) | 2004-08-11 |
Family
ID=7852239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98966148A Expired - Lifetime EP0960275B1 (de) | 1997-12-17 | 1998-11-17 | Hochdruckpumpe zur kraftstoffversorgung bei kraftstoffeinspritzsystemen von brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US6186120B1 (de) |
EP (1) | EP0960275B1 (de) |
JP (1) | JP2001511869A (de) |
DE (2) | DE19756087A1 (de) |
WO (1) | WO1999031383A1 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19848040A1 (de) * | 1998-10-17 | 2000-04-20 | Bosch Gmbh Robert | Kolbenpumpe zur Kraftstoffhochdruckversorgung |
DE19916376A1 (de) * | 1999-04-12 | 2000-10-19 | Mannesmann Rexroth Ag | Pumpengehäuse |
DE19951410A1 (de) * | 1999-10-26 | 2001-05-10 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Variation eines von einer Niederdruckpumpe erzeugten und an einer Hochdruckpumpe anliegenden Vordrucks |
DE19959202C2 (de) * | 1999-12-08 | 2002-01-10 | Hans Schuetz | Überdruckabschaltventil für Hochdruckkolbenpumpen |
JP2001207927A (ja) * | 2000-01-26 | 2001-08-03 | Mitsubishi Electric Corp | 燃料供給装置 |
JP2001221118A (ja) * | 2000-02-07 | 2001-08-17 | Bosch Automotive Systems Corp | 燃料噴射装置 |
DE10023033A1 (de) * | 2000-05-11 | 2001-11-22 | Bosch Gmbh Robert | Verfahren zum Betreiben eines Kraftstoffzumesssystems einer direkteinspritzenden Brennkraftmaschine |
DE10144669C1 (de) * | 2001-09-11 | 2003-04-17 | Siemens Ag | Verfahren und Vorrichtung zur Steuerung eines Kraftstoffdrucks für eine Hochdruckeinspritzung |
DE10157375A1 (de) | 2001-11-22 | 2003-06-05 | Daimler Chrysler Ag | Hochdruckpumpe |
DE10213626A1 (de) * | 2002-03-27 | 2003-10-23 | Bosch Gmbh Robert | Hochdruck-Kraftstoffpumpe für ein Kraftstoffsystem einer Brennkraftmaschine |
DE10229396A1 (de) * | 2002-06-29 | 2004-01-22 | Robert Bosch Gmbh | Radialkolbenpumpe zur Kraftstoffhochdruckversorgung bei Einspritzsystemen von Brennkraftmaschinen mit verbessertem Wirkungsgrad |
WO2006006495A1 (ja) * | 2004-07-12 | 2006-01-19 | Yanmar Co., Ltd. | 蓄圧式燃料噴射装置及びその蓄圧式燃料噴射装置を備えた内燃機関 |
US20080078362A1 (en) * | 2006-09-29 | 2008-04-03 | Caterpillar Inc. | Variable discharge pump having single control valve |
IT1394070B1 (it) * | 2009-05-13 | 2012-05-25 | Bosch Gmbh Robert | Gruppo valvola per controllare l'alimentazione e la mandata di combustibile di una camera di compressione di una pompa a pistoni di alta pressione e pompa a pistoni di alta pressione comprendente tale gruppo valvola |
IT1397725B1 (it) * | 2009-12-22 | 2013-01-24 | Bosch Gmbh Robert | Impianto di alimentazione del carburante da un serbatoio ad un motore a combustione interna. |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0889233A2 (de) * | 1993-05-06 | 1999-01-07 | Cummins Engine Company, Inc. | Kompakte Kraftstoffanlage hoher Leistung mit Speicher |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4838232A (en) * | 1984-08-14 | 1989-06-13 | Ail Corporation | Fuel delivery control system |
US5058553A (en) * | 1988-11-24 | 1991-10-22 | Nippondenso Co., Ltd. | Variable-discharge high pressure pump |
JP2869464B2 (ja) * | 1989-05-30 | 1999-03-10 | 富士重工業株式会社 | 2サイクルエンジンの燃料噴射制御装置 |
JP2712760B2 (ja) * | 1990-05-29 | 1998-02-16 | トヨタ自動車株式会社 | 燃料噴射弁 |
JPH08158971A (ja) * | 1994-12-07 | 1996-06-18 | Zexel Corp | 高圧燃料噴射装置用燃料ポンプ |
IT1281303B1 (it) * | 1995-03-28 | 1998-02-17 | Elasis Sistema Ricerca Fiat | Dispositivo di regolazione della pressione di alimentazione di un fluido in un accumulatore di fluido in pressione, ad esempio per |
JPH08338335A (ja) * | 1995-06-09 | 1996-12-24 | Nippondenso Co Ltd | 内燃機関の燃料供給装置 |
JP3594144B2 (ja) * | 1995-08-30 | 2004-11-24 | 株式会社デンソー | 燃料供給装置 |
DE19549108A1 (de) * | 1995-12-29 | 1997-07-03 | Bosch Gmbh Robert | System zur Kraftstoffhochdruckerzeugung für ein in Brennkraftmaschinen eingesetztes Kraftstoffeinspritzsystem |
JPH09195926A (ja) * | 1996-01-17 | 1997-07-29 | Unisia Jecs Corp | ラジアルプランジャポンプ |
DE19744723A1 (de) * | 1997-10-10 | 1999-04-15 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung |
-
1997
- 1997-12-17 DE DE19756087A patent/DE19756087A1/de not_active Ceased
-
1998
- 1998-11-17 DE DE59811797T patent/DE59811797D1/de not_active Expired - Lifetime
- 1998-11-17 JP JP53187199A patent/JP2001511869A/ja not_active Withdrawn
- 1998-11-17 EP EP98966148A patent/EP0960275B1/de not_active Expired - Lifetime
- 1998-11-17 US US09/355,502 patent/US6186120B1/en not_active Expired - Fee Related
- 1998-11-17 WO PCT/DE1998/003379 patent/WO1999031383A1/de active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0889233A2 (de) * | 1993-05-06 | 1999-01-07 | Cummins Engine Company, Inc. | Kompakte Kraftstoffanlage hoher Leistung mit Speicher |
Also Published As
Publication number | Publication date |
---|---|
DE19756087A1 (de) | 1999-06-24 |
WO1999031383A1 (de) | 1999-06-24 |
US6186120B1 (en) | 2001-02-13 |
DE59811797D1 (de) | 2004-09-16 |
JP2001511869A (ja) | 2001-08-14 |
EP0960275A1 (de) | 1999-12-01 |
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