EP1348865A2 - Pompe haute pression de combustibe pour un system de combustible d'un moterur à combustion interne - Google Patents

Pompe haute pression de combustibe pour un system de combustible d'un moterur à combustion interne Download PDF

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Publication number
EP1348865A2
EP1348865A2 EP02026059A EP02026059A EP1348865A2 EP 1348865 A2 EP1348865 A2 EP 1348865A2 EP 02026059 A EP02026059 A EP 02026059A EP 02026059 A EP02026059 A EP 02026059A EP 1348865 A2 EP1348865 A2 EP 1348865A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
cylinders
pressure fuel
fuel pump
control 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.)
Withdrawn
Application number
EP02026059A
Other languages
German (de)
English (en)
Other versions
EP1348865A3 (fr
Inventor
Helmut Rembold
Heinz Siegel
Manuel Schoepke
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1348865A2 publication Critical patent/EP1348865A2/fr
Publication of EP1348865A3 publication Critical patent/EP1348865A3/fr
Withdrawn legal-status Critical Current

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M59/08—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 two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • 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 a high-pressure fuel pump for a fuel system of an internal combustion engine, with a A plurality of cylinders with pistons, each one Limit work space with a drive shaft, which at one turn the pistons in a reciprocating motion offset, and with at least one quantity control valve, which at least during a funding cycle Cylinder at least temporarily a delivery room this Can connect cylinders with a pressure relief area.
  • Such a high pressure fuel pump is from the market known. It is used in such fuel systems used, which in internal combustion engines with gasoline or Diesel direct injection can be used. By a such high pressure fuel pump will run on the fuel compressed to a very high pressure and into a fuel rail ("Rail”) promoted and under high pressure there saved. There are several on this fuel rail Injectors connected to the fuel in each Inject combustion chambers.
  • the drive shaft of the well-known high pressure fuel pump is rigid with a camshaft of the internal combustion engine coupled.
  • the Delivery rate of the fuel pump directly from the speed the internal combustion engine.
  • the internal combustion engine in which despite high speed only little fuel is injected into the combustion chambers, so even little fuel from the high pressure fuel pump must be promoted.
  • a volume control valve provided by a Control and regulating device is controlled so that it is against Opens briefly at the end of a funding wing.
  • the under high Pressure in the delivery chamber of the fuel pump compressed Fuel is then not in the fuel rail pumped but into an upstream from the high pressure fuel pump drained low pressure area. ever the flow control valve longer during a delivery cycle is open, the lower it is Quantity of fuel reaching the fuel line.
  • the object of the present invention is this Pressure pulsations in the low pressure range continue to increase reduce so that this is correspondingly inexpensive can be manufactured and / or long life having.
  • the high-pressure fuel pump at least three cylinders, two At least one flow control valve is assigned to cylinders and the pistons of these cylinders to each other about 180 ° are driven out of phase, and being the third Cylinder arranged and the drive shaft designed so is that the piston of the third cylinder is approximately 90 ° driven out of phase with the other two cylinders becomes.
  • a three-cylinder fuel pump created which has a high output has, but also in the low pressure range pressure pulsations occurring are comparatively low can be held.
  • the stroke volume of the third cylinder is smaller than the respective Stroke volumes of the other two cylinders.
  • the design according to the invention ensures that these pressure pulsations are comparatively low.
  • the delivery rate is at least one Cylinder via an associated with the cylinder inlet valve can be adjusted.
  • the volume control valve can in any case required inlet valve must be integrated. This Integration is relatively easy.
  • the advantages according to the invention can be achieved without that additional flow channels in the pump housing required are.
  • At least one of the cylinders via the volume control valve or inlet valve can be switched on and off.
  • valve is not very dynamic required so that it can be made cheaper can. Nevertheless, the delivery rate can be Switch off the cylinder at least in the rough frame can be set.
  • the delivery rooms of the two cylinders with the approximately 180 ° to each other the phase-shifted piston is the same Quantity control valve is assigned. That is why possible, since only one of the two cylinders is always in the Funding cycle is located. Thus, a volume control valve be saved what the manufacturing costs of low pressure fuel pump according to the invention lowers.
  • volume control valve be a is a continuously adjustable valve.
  • a volume control valve with two switch positions conceivable, which has price advantages, since a cheaper power amplifier due to the lower requirements for the switching time can be used.
  • a continuously adjustable valve has the advantage, however, that the amount to be conveyed is very can be set exactly what a reduction in Power consumption of the high pressure fuel pump enables.
  • the quantity control valve has three connections, one connection leading to the outlet of one delivery chamber, an opposite connection leading to the outlet of the other delivery chamber, and a further opposite connection leading to a high-pressure outlet of the high-pressure pump.
  • a hydraulic circuit has the advantage that, in contrast to a valve with only two connections, an additional check valve that is otherwise required can be dispensed with.
  • Such a high-pressure fuel pump is small and inexpensive.
  • an internal combustion engine carries this overall Reference number 10. It comprises a fuel system (without Numbered). This promotes an electrical Low pressure pump 14 fuel from a fuel tank 16. From there, the fuel passes through a low pressure fuel line 18 to a high-pressure fuel pump 20, which is only symbolically dash-dotted in FIG. 1 is shown. It is explained in detail below. At the low pressure fuel line 18 is a Pressure damper 22 connected.
  • the high-pressure fuel pump 20 delivers into a Fuel manifold 24, in the operation of the Fuel is stored under high pressure. To these are several injectors 26 connected, which run the fuel Combustion chambers 28 assigned directly in them inject. A pressure relief valve 30 carries excess Fuel from the fuel rail 24 in the Low pressure fuel line 18 back. A pressure sensor 32 detects the prevailing in the fuel rail 24 Pressure and sends appropriate signals to a control and Control unit 34. This in turn controls the high pressure fuel pump 20 on. Incidentally, this is directly above a clutch, not shown, of one in Figure 1 only symbolically shown camshaft 36 of the Internal combustion engine 10 driven.
  • the high-pressure fuel pump 20 of the internal combustion engine 10 is shown in more detail in Figure 2: After the high pressure fuel pump 20 includes a drive shaft 38 with an eccentric section 40. On this is an in Figure 2 not shown cam ring attached. Over here intermediate elements of no further interest are shown in a rotation of the drive shaft 38 from the eccentric section 40 three radially arranged pistons 42, 44 and 46 in a back and forth Moved here.
  • the pistons 42 to 46 are not closer in one shown housing and limit areas Delivery rooms 48, 50 and 52. Via as an inlet valve acting spring-loaded ball check valves 54 to 58 can the delivery rooms 48 to 52 with the low pressure fuel line 18 are connected. Similar spring-loaded ball check valves 60, 62 and 64 form outlet valves with which the delivery spaces 48 to 52 to be connected to a high pressure fuel line 66 can, which leads to the fuel rail 24.
  • Components 42, 48, 54 and 60 belong to a cylinder 68, the components 44, 50, 56, 62 to form a cylinder 70, and components 46, 52, 58 and 64 to form a cylinder 72.
  • the cylinders 68 to 72 are hydraulic as follows interconnected:
  • Node 74 Guide the exhaust valves 60 and 64 of cylinders 68 and 72 to a node 74. This is over a spring-loaded check valve 76 with the high pressure fuel line 66 connected.
  • the outlet valve 62 of the Cylinder 70 is connected to a node 77 which between the check valve 76 and the high pressure fuel line 66 lies.
  • Node 74 is also via an infinitely adjustable electromagnetic actuated quantity control valve 78 and a node 80 connected to a channel (without reference number), to which in turn all inlet valves 54, 56 and 58 and the Low pressure fuel line 18 are connected.
  • the Cylinder 68 and cylinder 72 are offset from one another by 180 ° arranged. Because pistons 42 and 46 of cylinders 68 and 72 from the same eccentric section 40 of the drive shaft 38 are driven, they turn when the Drive shaft 38 with a phase shift of 180 ° in a back and forth movement. This means that when the piston 42 of the cylinder 68 moves radially moves outward, the piston 46 of the cylinder 42 after moved radially inward, and vice versa.
  • the volume control valve remains 78 in its normally closed position.
  • a Suction stroke of a piston 42, 44 or 46 of a cylinder 68, 70 or 72 one suction stroke corresponds to one radially inward directed movement of a piston 42 to 46
  • the quantity control valve 78 energized and open, opens due to pressure drop in the said area, the exhaust valve 60 so that the 48 existing fuel under high pressure in the delivery chamber can flow out.
  • the piston 46 of the Cylinder 72 has a radially inward movement executes, so this cylinder in one suction cycle and the intake valve 58 of this cylinder 72 is open, the escaping from the delivery chamber 48 flows Fuel via the quantity control valve 78 is not complete in the low pressure fuel line 18, but at least partly through the open inlet valve 58 in the Delivery chamber 52 of the cylinder 72.
  • the volume control valve 78 is described in the above Opened in this way, there is comparatively little Fuel into the low pressure fuel line 18 so that the corresponding pressure surge in the low pressure fuel line 18 is also comparatively low. The components of the low pressure fuel line 18 are therefore spared and the low pressure surge in essentially be absorbed by the pressure damper 22.
  • the conveying capacity of the Cylinder 70 Its outlet valve 62 is as shown in FIG. 2 can be seen via the node 77 directly with the High pressure fuel line 66 connected.
  • the corresponding one Channel thus opens downstream from Check valve 76 into the high pressure fuel line 66.
  • a control of the quantity control valve 78 is therefore open the delivery rate of the cylinder 70 does not affect this promotes with the drive shaft 38 rotating.
  • volume control valve 78 is a switching valve, which goes between two switch positions can be switched down. But it is also possible Use of a continuously adjustable valve. In this The opening pressure of the exhaust valves 60 and 64 may fall continuously adjustable, which is a particularly precise Setting the delivery rate of the high pressure fuel pump 20 allows.
  • valve 82 The difference of the high pressure fuel pump shown in Figure 3 to that shown in Figure 2 the cylinder 70.
  • This is a switchable in the present case Valve 82 assigned, which hydraulically between the Delivery chamber 50 of the cylinder 70 and the low-pressure fuel line 18 is arranged.
  • the valve 82 has two Switch positions: The valve is in switch position 84 82 permeable in both directions. So it's a free one Fluid exchange between the delivery chamber 50 and the Low pressure fuel line 18 possible. In the Switch position 86, the valve 82 works as spring-loaded check valve 56, corresponding to the Inlet valve in Figure 2.
  • the valve 82 is also from the control and regulating device 34 controllable.
  • switch position 84 during a suction stroke of the piston 44 of the cylinder 70 Fuel from the low pressure fuel line 18 in the Delivery chamber 50 sucked in and in the subsequent Delivery stroke straight back into the low pressure fuel line 18 ejected.
  • the valve is located 82, on the other hand, in switch position 56, arrives at one Suction stroke of the piston 44 fuel from the low-pressure fuel line 18 in the delivery room 50, at one Delivery stroke of the piston 44, however, the fuel over exhaust valve 62 and node 77 into FIG High pressure fuel line 66 ejected.
  • the cylinder 70 can therefore move out and in via the valve 82 be switched on. If the valve 82 is in the Switch position 84, it may be due to the movements piston 44 of cylinder 70 in the low pressure fuel line 18 also come to pressure pulsations. In order to keep this as low as possible, the stroke volume of the Cylinder 70 compared to the stroke volumes of the cylinders 68 and 72 relatively small.
  • the high-pressure fuel pump 20 shown in FIG. 4 also has valve 82 with which cylinder 70 can be switched on and off. Beyond that it is Flow control valve 78 designed as a 2/3 way valve, it has two switch positions 86 and 88 and three ports 90, 92 and 94. This has the advantage that between the delivery spaces 48 and 52 of the cylinders 68 and 72 and the high pressure fuel line 66 only two in total Check valves 60 and 64 are required.
  • the delivery spaces 48 and 52 of the cylinders 68 and 72 are directly connected to the volume control valve 78. It is the delivery chamber 52 of the cylinder 72 with the connection 90 and the delivery chamber 48 of the cylinder 68 with the opposite connection 94 of the quantity control valve 78 connected. Parallel to the connection of the delivery room 48 with the connection 94 is the delivery chamber 48 via the spring-loaded check valve 60 also with the node 77 or connected to the high pressure fuel line 66.
  • This node 77 is also spring loaded Check valve 64 with the next to port 94 lying connection 92 of the quantity control valve 78 connected.
  • switch position 86 of the volume control valve 78 can fuel from the delivery chamber 52 through the Ports 90 and 92 of the volume control valve 78 and that Check valve 64 in the high pressure fuel line 66 stream.
  • the branch parallel to this, which ends in connection 94 is blocked.
  • High-pressure fuel pump 20 corresponds to that of Figure 4, with the exception of cylinder 70: this cannot move in and out turned off. Instead it is an inlet valve 56 a normal spring loaded check valve intended.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
EP02026059A 2002-03-27 2002-11-22 Pompe haute pression de combustibe pour un system de combustible d'un moterur à combustion interne Withdrawn EP1348865A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002113626 DE10213626A1 (de) 2002-03-27 2002-03-27 Hochdruck-Kraftstoffpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
DE10213626 2002-03-27

Publications (2)

Publication Number Publication Date
EP1348865A2 true EP1348865A2 (fr) 2003-10-01
EP1348865A3 EP1348865A3 (fr) 2004-09-15

Family

ID=27798198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02026059A Withdrawn EP1348865A3 (fr) 2002-03-27 2002-11-22 Pompe haute pression de combustibe pour un system de combustible d'un moterur à combustion interne

Country Status (2)

Country Link
EP (1) EP1348865A3 (fr)
DE (1) DE10213626A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008042049A1 (fr) * 2006-09-29 2008-04-10 Caterpillar Inc. Pompe de décharge variable présentant une soupape de commande unique
WO2013037481A1 (fr) * 2011-09-13 2013-03-21 L'orange Gmbh Système de pompes haute pression

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011005487A1 (de) 2011-03-14 2012-09-20 Robert Bosch Gmbh Ventileinrichtung, insbesondere Auslassventil einer Kraftstoff-Hochdruckpumpe einer Brennkraftmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1217256B (it) * 1987-08-25 1990-03-22 Weber Srl Pompa di iniezione per impianti di iniezione del combustibile con iniettori comandati per motori a ciclo diesel
US5538403A (en) * 1994-05-06 1996-07-23 Cummins Engine Company, Inc. High pressure pump for fuel injection systems
DE19756087A1 (de) * 1997-12-17 1999-06-24 Bosch Gmbh Robert Hochdruckpumpe zur Kraftstoffversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008042049A1 (fr) * 2006-09-29 2008-04-10 Caterpillar Inc. Pompe de décharge variable présentant une soupape de commande unique
WO2013037481A1 (fr) * 2011-09-13 2013-03-21 L'orange Gmbh Système de pompes haute pression

Also Published As

Publication number Publication date
DE10213626A1 (de) 2003-10-23
EP1348865A3 (fr) 2004-09-15

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