EP0270720A1 - Pumpe mit variablem Durchfluss - Google Patents

Pumpe mit variablem Durchfluss Download PDF

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Publication number
EP0270720A1
EP0270720A1 EP86402785A EP86402785A EP0270720A1 EP 0270720 A1 EP0270720 A1 EP 0270720A1 EP 86402785 A EP86402785 A EP 86402785A EP 86402785 A EP86402785 A EP 86402785A EP 0270720 A1 EP0270720 A1 EP 0270720A1
Authority
EP
European Patent Office
Prior art keywords
piston
variable
pump
control system
chamber
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Withdrawn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
EP86402785A
Other languages
English (en)
French (fr)
Inventor
Jean-Pierre Jourde
Marc Miettaux
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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
Priority to FR8510860A priority Critical patent/FR2585077B1/fr
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Priority to EP86402785A priority patent/EP0270720A1/de
Publication of EP0270720A1 publication Critical patent/EP0270720A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F02M59/30—Varying fuel delivery in quantity or timing with variable-length-stroke pistons
    • 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
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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

Definitions

  • the present invention relates to a flow generation system of the variable flow pump type, which applies in particular to the fuel supply of the engines.
  • High pressure variable flow generation devices generally use piston pumps. In these types of pump, the piston stroke is varied mechanically.
  • the object of the present invention is to provide a flow generation system, of the high-efficiency variable flow pump type, which is free from any continuous mechanical connection with the power take-off.
  • variable flow pump which comprises at least one piston associated with a chamber; said piston cooperating with a surface driven by a reciprocating movement with constant displacement.
  • the piston is free from any continuous mechanical connection with said surface.
  • the chamber is associated with a flow control system, which is arranged upstream of this chamber.
  • the chamber is provided with a valve on its supply, and it is provided with a valve on its outlet.
  • the adjustment system is supplied by a booster pump.
  • the chamber is formed directly by the piston, which slides in the body of the pump.
  • the chamber is limited by the bottom of the pump body, and by the upper face of the piston.
  • the surface consists of the upper part of a pusher, which cooperates via its lower face with a cam linked to the power take-off.
  • the pusher slides in a guide, and said pusher is kept in contact with the cam by a spring.
  • the flow control system consists of a fixed throttle, which is associated with an adjustable pressure relief valve provided with a control.
  • the flow control system consists of a variable throttle provided with a control and associated with a pressure limiter.
  • the flow control system consists of a proportional distributor provided with a control and associated with a pressure limiter.
  • the adjustment system consists of a distributor provided with a control, and associated with a pressure limiter.
  • variable flow pump thus has the advantage of not requiring a mechanical connection between the piston and the power take-off. Therefore it can be easily adapted to an electrical control, because it avoids interface problems. In addition, the assembly has a very good yield, and the simplicity of the device results in a low cost price.
  • variable flow pump proper which consists of a piston 1, which slides in a bore 20 arranged in the pump body 17.
  • the piston 1 cooperates with a surface 3 which is driven by an alternating movement with constant displacement. This surface 3 is linked to the power take-off.
  • the piston 1 is free from any continuous connection with this surface 3.
  • the chamber 2 is formed directly by the movement of the piston 1 in the bore 20.
  • the chamber 2 is limited by the bottom 18 of the pump body 17 and by the upper face 22 of the piston 1.
  • the underside 21 of the piston 1 cooperates with the surface 3, which belongs to a pusher 4.
  • This pusher 4 slides freely in a guide 23.
  • the underside 19 of the pusher 4 is associated with a cam 5 which is linked to the grip of movement materialized by a tree 6.
  • Chamber 2 is provided on the supply of a valve 7 and on the discharge of a valve 8; the chamber 2 being associated with a flow control system 9 arranged upstream of the valve 7.
  • the supply circuit includes a reservoir 11 into which a booster pump 10 is drawn via a channel 12.
  • This booster pump 10 delivers into a channel 13, which feeds the flow control system 9.
  • the flow control system 9 directly feeds a booster channel 14 in which the booster pressure P14 prevails.
  • the booster channel 14 thus connects the flow control system 9 with the supply valve 7.
  • the discharge valve 8 is connected directly to a discharge channel 15 connected to the use.
  • variable flow pump thus comprises a surface 3, which is driven by an alternating movement provided by a cam 5. It should be noted that this alternating movement can be provided by any other means, and that the displacement of the surface 3 is constant whatever the cubic capacity desired for the pump. The maximum amplitude of this displacement of the surface 3 defines a stroke C3.
  • the stroke of the piston 1 is then equal to the difference between C3 and C m, that is to say the value C1.
  • the product of the stroke C1 of the piston 1 by the surface of the said piston 1 defines the quantity of liquid discharged by the piston 1 through the discharge valve 8. This product is the displacement of the pump at this given moment, and it is a function of the value set by the flow control system 9.
  • FIG. 2 shows an embodiment of the variable flow pump according to the invention.
  • the shaft 6 which carries the cam 5 is directly supported by two bearings 35 mounted in the guide 23 of the pusher 4.
  • a spring 24 is mounted between the surface 3 of the pusher 4 and the lower part of the body 17 of the pump .
  • FIG. 3 A first embodiment of the flow control system 9 is shown in FIG. 3.
  • the flow control system 9 comprises a fixed throttle 25 mounted on the channel 13 and supplying the channel 14.
  • An adjustable pressure relief valve 36 is mounted in bypass upstream of the fixed choke 25, and it is controlled by a control 31.
  • This first embodiment makes it possible to adjust the displacement of the chamber 2 by adjusting the supply pressure P13 which is established in channel 13.
  • the control 31, by acting on the pressure limiter 26, makes it possible to adjust the supply pressure P13, and as we have just seen, thus to regulate the displacement of the pump for a given speed.
  • the flow control system 9 comprises a variable restrictor 28 mounted on the channel 13 and supplying the channel 14; this variable choke 28 is controlled by a control 32.
  • a pressure limiter 27 is mounted in bypass in front of the variable choke 28.
  • This embodiment makes it possible to adjust the displacement of the chamber 2 by adjusting the feed rate Q13 with a constant feed pressure P13.
  • FIG. 5 Another embodiment of the flow control system 9 is shown in FIG. 5.
  • the flow control system 9 comprises a proportional distributor 29 mounted on the channel 13 and supplying the channel 14; this proportional distributor 29 is controlled by a command 33.
  • a pressure limiter 27 is mounted in bypass upstream of the proportional distributor 29. This embodiment makes it possible to adjust the displacement of the chamber 2 by dividing the feed rate Q13.
  • the flow rate Q13 of the garage pump 10 is divided between the need for boosting Q14 and the excess flow rate or leakage flow rate Q f .
  • the proportion between the leakage rate Q f is produced by the proportional distributor 29, which is controlled by the control 33.
  • the supply pressure P13 adjusts itself, however a pressure limiter 27 is provided for safety and to limit the pressure at the start or during regime changes.
  • the flow control system 9 comprises a distributor 30 mounted on the channel 13 and supplying the channel 14; this distributor 30 is controlled by a control 34.
  • a pressure limiter 27 is mounted in bypass upstream of the distributor 30.
  • This embodiment makes it possible to adjust the displacement of the chamber 2 by a sequential control.
  • the two-position distributor 30 is placed on the booster channel 14. This distributor 30 is controlled by the control 34 synchronously with the rotation of the variable flow pump. Therefore it is the opening time of the distributor 30 which determines the feeding rate Q14.
  • variable flow pump only discharging during half of its rotation, the discharge flow Q15 will be: or the effective displacement:
  • the period T in seconds is indeed the speed N in revolutions per second by the relation:
  • the adjustment of the time t for the command 34 therefore makes it possible to fix the displacement independently of the speed.
  • the various commands 31, 32, 33 and 34 make it possible to develop a control signal by mechanical or electrical fluid.
  • This signal maintains the displacement at the desired value according to external parameters, such as pressure, flow, power or any other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP86402785A 1985-07-16 1986-12-12 Pumpe mit variablem Durchfluss Withdrawn EP0270720A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8510860A FR2585077B1 (fr) 1985-07-16 1985-07-16 Pompe a debit variable
EP86402785A EP0270720A1 (de) 1986-12-12 1986-12-12 Pumpe mit variablem Durchfluss

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86402785A EP0270720A1 (de) 1986-12-12 1986-12-12 Pumpe mit variablem Durchfluss

Publications (1)

Publication Number Publication Date
EP0270720A1 true EP0270720A1 (de) 1988-06-15

Family

ID=8196367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402785A Withdrawn EP0270720A1 (de) 1985-07-16 1986-12-12 Pumpe mit variablem Durchfluss

Country Status (1)

Country Link
EP (1) EP0270720A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025887A1 (de) * 1994-03-23 1995-09-28 Siemens Aktiengesellschaft Anordnung zur einspritzung von kraftstoff in die zylinder einer brennkraftmaschine
WO1997024526A1 (de) * 1995-12-29 1997-07-10 Robert Bosch Gmbh System zur kraftstoffhochdruckerzeugung für ein in brennkraftmaschinen eingesetztes kraftstoffeinspritzsystem
JPH1194097A (ja) * 1997-06-30 1999-04-09 Robert Bosch Gmbh 液体の制御のための流量調整弁
WO1999061796A1 (en) * 1998-05-26 1999-12-02 Caterpillar Inc. Hydraulic system having a variable delivery pump
DE19904341A1 (de) * 1999-02-03 2000-08-10 Mannesmann Rexroth Ag Steuerungsverfahren
EP1296060A3 (de) * 2001-09-22 2004-05-12 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
EP1612402A1 (de) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Hochdruckpumpe mit variabler Förderrate für ein Brennstoffeinspritzsystem
WO2011067008A1 (de) * 2009-12-02 2011-06-09 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit differenzmengenregelung bei elektrischer vorförderpumpe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2252497A1 (de) * 1973-11-23 1975-06-20 Cav Ltd
US4134549A (en) * 1974-05-30 1979-01-16 Cummins Engine Company, Inc. Injectors of a fuel supply system for an internal combustion engine
DE2823276A1 (de) * 1978-05-27 1979-11-29 Bosch Gmbh Robert Kraftstoffeinspritzanlage
FR2434277A1 (fr) * 1978-08-23 1980-03-21 Lucas Industries Ltd Systeme d'alimentation en carburant pour moteur a combustion interne
GB2111133A (en) * 1981-12-09 1983-06-29 Bosch Gmbh Robert Fuel injection apparatus for combustion engines especially for diesel engines
FR2585077A1 (fr) * 1985-07-16 1987-01-23 Renault Pompe a debit variable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2252497A1 (de) * 1973-11-23 1975-06-20 Cav Ltd
US4134549A (en) * 1974-05-30 1979-01-16 Cummins Engine Company, Inc. Injectors of a fuel supply system for an internal combustion engine
DE2823276A1 (de) * 1978-05-27 1979-11-29 Bosch Gmbh Robert Kraftstoffeinspritzanlage
FR2434277A1 (fr) * 1978-08-23 1980-03-21 Lucas Industries Ltd Systeme d'alimentation en carburant pour moteur a combustion interne
GB2111133A (en) * 1981-12-09 1983-06-29 Bosch Gmbh Robert Fuel injection apparatus for combustion engines especially for diesel engines
FR2585077A1 (fr) * 1985-07-16 1987-01-23 Renault Pompe a debit variable

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025887A1 (de) * 1994-03-23 1995-09-28 Siemens Aktiengesellschaft Anordnung zur einspritzung von kraftstoff in die zylinder einer brennkraftmaschine
CN1072312C (zh) * 1995-12-29 2001-10-03 罗伯特·博施有限公司 内燃机的燃料入喷系统中燃料高压产生系统
WO1997024526A1 (de) * 1995-12-29 1997-07-10 Robert Bosch Gmbh System zur kraftstoffhochdruckerzeugung für ein in brennkraftmaschinen eingesetztes kraftstoffeinspritzsystem
JPH1194097A (ja) * 1997-06-30 1999-04-09 Robert Bosch Gmbh 液体の制御のための流量調整弁
WO1999061796A1 (en) * 1998-05-26 1999-12-02 Caterpillar Inc. Hydraulic system having a variable delivery pump
US6162022A (en) * 1998-05-26 2000-12-19 Caterpillar Inc. Hydraulic system having a variable delivery pump
DE19904341A1 (de) * 1999-02-03 2000-08-10 Mannesmann Rexroth Ag Steuerungsverfahren
EP1296060A3 (de) * 2001-09-22 2004-05-12 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
US6848423B2 (en) 2001-09-22 2005-02-01 Robert Bosch Gmbh Fuel injection system for an internal combustion engine
EP1612402A1 (de) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Hochdruckpumpe mit variabler Förderrate für ein Brennstoffeinspritzsystem
US7261087B2 (en) 2004-06-30 2007-08-28 C.R.F. Societa Consortile Per Azioni High-pressure variable-flow-rate pump for a fuel-injection system
WO2011067008A1 (de) * 2009-12-02 2011-06-09 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit differenzmengenregelung bei elektrischer vorförderpumpe
CN102770658A (zh) * 2009-12-02 2012-11-07 罗伯特·博世有限公司 具有用于电动预输送泵的量差控制的燃料喷射装置
CN102770658B (zh) * 2009-12-02 2015-01-28 罗伯特·博世有限公司 具有用于电动预输送泵的量差控制的燃料喷射装置

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Inventor name: JOURDE, JEAN-PIERRE

Inventor name: MIETTAUX, MARC