EP0752061B1 - Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne - Google Patents

Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne Download PDF

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Publication number
EP0752061B1
EP0752061B1 EP95911205A EP95911205A EP0752061B1 EP 0752061 B1 EP0752061 B1 EP 0752061B1 EP 95911205 A EP95911205 A EP 95911205A EP 95911205 A EP95911205 A EP 95911205A EP 0752061 B1 EP0752061 B1 EP 0752061B1
Authority
EP
European Patent Office
Prior art keywords
pressure pump
pressure
valve
suction
piston
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
EP95911205A
Other languages
German (de)
English (en)
Other versions
EP0752061A1 (fr
Inventor
Wendelin KLÜGL
Detlev SCHÖPPE
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.)
Siemens AG
Original Assignee
Siemens AG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6513623&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0752061(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0752061A1 publication Critical patent/EP0752061A1/fr
Application granted granted Critical
Publication of EP0752061B1 publication Critical patent/EP0752061B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M59/34—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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type

Definitions

  • the invention relates to an arrangement according to the preamble of claim 1.
  • the invention has for its object in an arrangement according to the generic term to control the flow simplify.
  • the basic idea of the invention according to claim 1 is that Control of fuel flow to the low pressure side embarrassed. You then come with a single actuator for the fuel flow, even when using a high pressure pump multiple pistons is used; and can be done with a simple, non-adjustable high pressure pump.
  • a low-pressure pump 1 conveys fuel a predetermined pressure (for example 2 bar) from a Tank 2.
  • a pressure relief valve 3 regulates the fuel delivery pressure to the specified value.
  • a control valve 4 provided between a line 5 and 6 is arranged.
  • the line 6 is with two differential pressure valves 7 and 8 in connection leading to the high pressure pump.
  • the high pressure pump essentially has one in a housing 9, 10 arranged pistons 11, 12 on the each can be driven by a cam 13, 14. Between Piston 11, 12 and the housings 9, 10 are each a space 15, 16 indicated, each with one of the differential pressure valves 7, 8 and on the other hand each with a check valve 17, 18 is connected.
  • the check valves 17, 18 are connected to a high pressure line 19, which leads to a high pressure accumulator, not shown.
  • a pressure sensor 42 is connected to the high-pressure line 19, which determines the pressure in the high pressure line 19 and delivers the determined value to a control unit 21 which in turn a control command based on engine-specific data to the control valve 4 supplies.
  • the low pressure pump 1 delivers fuel from the tank 2 and brings the fuel to a predetermined pressure of, for example 2 bar.
  • the control valve 4 regulates the fuel flow in line 6 so that it The demand of the internal combustion engine corresponds.
  • the differential pressure valves 7, 8 are chosen so that they are at a pressure difference open from 0.5 bar. In the situation shown, the Piston 12 due to the movement of the cam 14 (arrow B) moved down (the pistons 11, 12 are through in this direction biased a spring, not shown), so that the compression space 16 via the differential pressure valve 8 with fuel is filled.
  • the other cam 13 moves in the direction to its top dead center, so that in the compression space 15 located fuel via the check valve 17 in the High pressure line 19 and the high pressure accumulator is pressed.
  • the cams 13, 14 are positioned so that in each phase only one plunger sucks for even filling to ensure the compression spaces 15, 16.
  • Figure 2 shows an embodiment with which a uniform Filling the compression spaces 15, 16 can be achieved can.
  • the differential pressure valves shown in Figure 1 7, 8 arranged in the housings 9, 10.
  • a housing 9 is shown in FIG a cylinder 22 and a pump head 23.
  • One in Pump head 23 arranged inlet bore 24 leads to a Compression chamber 25 to which a cylinder 22 is displaceable arranged piston 26 connects.
  • a differential pressure valve 32 is arranged in the inlet bore 24, that from a plate spring 27 and a valve disk 28 there, the valve disc 28 on an annular Valve seat 29 of the pump head 23 creates and the valve seat 29 forms a sealing edge.
  • a Check valve 31 is arranged, the check valve 17th in Figure 1 corresponds.
  • the upper part of the high pressure pump corresponds to that in FIG. 2 shown arrangement and is therefore with the same reference numerals Mistake.
  • a camshaft 34 In the lower part of the high pressure pump is in a camshaft housing 33 a camshaft 34 is supported with a cam 35.
  • the cam 35 is connected to a tappet roller 36, which is rotatably mounted in a plunger 37.
  • the plunger 37 is provided by a plunger spring 39 arranged in a space 38 always pressed towards the camshaft 34 so that the Tappet roller 36 rolls on cam 35.
  • the room 38 stands with a camshaft space 40 via a relief bore 41 in Connection in which the camshaft 34 is mounted.
  • the piston 26 is not a Spring biased towards the camshaft. This means, that the piston 26 is guided freely floating in the cylinder. Becomes now with a downward movement of the plunger 37 via the control valve 4 ( Figure 1) a defined volume of fuel pressed into the compression chamber 25 via the valve 32, so the piston 26 makes a corresponding downward movement. At the upward movement of the plunger 37 over the plunger roller 36 is driven by the cam 35, the plunger 37 first back a certain idle stroke until it hits the piston at its Bottom comes to mind. With further upward movement the plunger 37 and the piston 26 is at high pressure compressed fuel via the check valve 31 and the Exit bore 30 pressed into the high pressure accumulator.
  • the arrangement of Figure 3 has compared to the arrangement of Figure 2 has the advantage that there is no compression space Cavity can flow in at a given The amount of fuel in the pistons stops. So that needs further the valve 32 is not a complex differential pressure valve to be trained. The spring force of the valve 32 must then not be too precise, so a cheaper valve can be used.
  • piston 26 and plunger 37 are separated the advantage that the filling pressure only the small mass of the Piston must move. The filling pressure can therefore be relative be kept small, the piston 26 gives way quickly enough and there is enough time for the filling process Available.

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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)

Abstract

L'invention vise à obtenir une commande simple et fonctionnant à la demande, du courant de carburant, et par conséquent de la pression régnant dans la partie haute pression d'un système d'injection (de type injection par accumulation de pression), à l'aide d'une pompe haute pression non pilotable comportant des clapets anti-retour situés côté aspiration et refoulement. A cet effet, le courant de carburant est établi coté basse pression par une pompe basse pression pilotable ou par une soupape de commande montée en aval. Si le courant de carburant établi est inférieur à la valeur maximale déterminée par le volume d'aspiration de la pompe haute pression, un piston 'flottant', en association avec un clapet anti-retour (17, 18) classique monté côté aspiration, ou un piston commandé par ressort et un clapet anti-retour se présentant sous forme de soupape de pression différentielle (7, 8), permettent d'éviter un dosage erroné.

Claims (6)

  1. Dispositif d'injection de carburant dans les cylindres d'un moteur à combustion interne à l'aide de soupapes d'injection, comportant,
    un accumulateur à haute pression pour le carburant, auquel sont reliées les soupapes d'injection et qui est relié à un réservoir de carburant (2) par une pompe à haute pression (9, 10) comportant des pistons (11, 12), un clapet anti-retour du côté aspiration et un clapet anti-retour du côté pression (7,17; 8, 18), ainsi que par une pompe à basse pression (1),
    un dispositif de réglage (21) pour le réglage du débit de carburant avant le clapet anti-retour (7, 8) du côté aspiration de la pompe haute pression en fonction de paramètres du moteur à combustion interne, la pompe à haute pression (9, 10) étant du type non régulée et ses pistons (11, 12) étant chargés par des ressorts,
    caractérisé en ce que
    le clapet anti-retour (7, 8) du côté aspiration est constitué par une soupape de pression différentielle, en ce que la soupape de pression différentielle (7, 8) est choisie de telle manière qu'elle s'ouvre pour une différence de pression donnée de 0,5 bar, de sorte qu'une formation de vide se produit au-dessus du piston (11, 12) dans la chambre de compression (15, 16), et non dans la canalisation du côté aspiration (6) qui mène à la pompe à haute pression (9).
  2. Dispositif selon la revendication 1, caractérisé par une pompe à basse pression réglable par le dispositif de réglage (21).
  3. Dispositif selon la revendication 1, caractérisé en ce que, entre le clapet anti-retour (7, 8) du côté aspiration de la pompe à haute pression (9, 10) et la pompe à basse pression (1) fournissant une pression de sortie à peu près constante, se trouve une soupape-pilote (4) réglable par le dispositif de réglage (21).
  4. Dispositif selon la revendication 1, caractérisé en ce qu'on utilise comme clapet anti-retour du côté aspiration un disque de soupape (28) en liaison avec un siège de soupape (29) et une rondelle-ressort (27), qui ferme l'arrivée du côté aspiration vers la chambre de compression de la pompe à haute pression sous la précontrainte de la rondelle-ressort (27).
  5. Dispositif selon la revendication 1, caractérisé en ce que la pompe à haute pression a au moins deux pistons (11, 12), dont les déplacements sont commandés de telle manière qu'un seul piston se trouve respectivement dans la phase d'aspiration.
  6. Dispositif d'injection de carburant dans les cylindres d'un moteur à combustion interne à l'aide de soupapes d'injection, comportant un accumulateur à haute pression pour le carburant, auquel sont reliées les soupapes d'injection et qui est relié à un réservoir de carburant (2) par une pompe à haute pression (9, 10) comportant des pistons (11, 12), un clapet anti-retour du côté aspiration et un clapet anti-retour du côté pression (7, 17; 8, 18), ainsi que par une pompe à basse pression (1), comportant un dispositif de réglage (21) pour le réglage du débit de carburant avant le clapet anti-retour (7, 8) du côté aspiration de la pompe à haute pression en fonction de paramètres du moteur à combustion interne, la pompe à haute pression (9, 10) étant du type non régulée et ses pistons (11, 12) étant chargés par des ressorts,
       caractérisé en ce que, comme clapet anti-retour (7, 8) du côté aspiration, on utilise une soupape de pression différentielle, en ce que la soupape de pression différentielle (7, 8) s'ouvre pour une différence de pression donnée de 0,5 bar entre la canalisation du côté aspiration (6), qui mène à la pompe à haute pression (9), et la chambre de compression (15, 16) de la pompe haute pression (9), de sorte qu'il ne se produit une formation de vide qu'au-dessus du piston (11, 12), dans la chambre de compression (15, 16) de la pompe à haute pression (9).
EP95911205A 1994-03-23 1995-03-03 Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne Expired - Lifetime EP0752061B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4410024 1994-03-23
DE4410024 1994-03-23
PCT/DE1995/000286 WO1995025887A1 (fr) 1994-03-23 1995-03-03 Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0752061A1 EP0752061A1 (fr) 1997-01-08
EP0752061B1 true EP0752061B1 (fr) 1999-01-27

Family

ID=6513623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95911205A Expired - Lifetime EP0752061B1 (fr) 1994-03-23 1995-03-03 Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne

Country Status (3)

Country Link
EP (1) EP0752061B1 (fr)
DE (1) DE59504990D1 (fr)
WO (1) WO1995025887A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102654091A (zh) * 2011-03-04 2012-09-05 Omt都灵机械车间有限公司 特别是燃料泵的液压泵

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19541507A1 (de) * 1995-11-08 1997-05-15 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE59901316D1 (de) * 1998-08-25 2002-05-29 Siemens Ag Verfahren zum schnellen aufbau des kraftstoffdruckes in einem kraftstoffspeicher
DE19902259B4 (de) * 1999-01-21 2006-02-23 Siemens Ag Montageverfahren
DE19937673A1 (de) * 1999-08-10 2001-02-22 Siemens Ag Einspritzanlage für eine Brennkraftmaschine
DE19951999B4 (de) * 1999-10-28 2004-11-18 Siemens Ag Einspritzanlage für eine Brennkraftmaschine
DE10029420B4 (de) * 2000-06-15 2006-05-04 Siemens Ag Vorrichtung zum Zuführen von Fluid zu einer Pumpe
EP1321663A3 (fr) * 2001-12-19 2003-07-02 Robert Bosch Gmbh Dispositif d'injection de combustible pour moteur à combustion interne
DE10218022A1 (de) 2002-04-23 2003-11-06 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
US20080078362A1 (en) * 2006-09-29 2008-04-03 Caterpillar Inc. Variable discharge pump having single control valve
DE102012107596B4 (de) * 2012-08-20 2016-05-04 Denso Corporation Hochdruckpumpe und Verfahren zum Betrieb einer Hochdruckpumpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0270720A1 (fr) * 1986-12-12 1988-06-15 Regie Nationale Des Usines Renault Pompe à débit variable
CH674243A5 (fr) * 1987-07-08 1990-05-15 Dereco Dieselmotoren Forschung
MX9403372A (es) * 1993-05-06 1995-01-31 Cummins Engine Co Inc Bomba de alta presion de desplazamiento variable para sistemas deinyeccion de combustible a deposito comun.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102654091A (zh) * 2011-03-04 2012-09-05 Omt都灵机械车间有限公司 特别是燃料泵的液压泵
CN102654091B (zh) * 2011-03-04 2016-07-06 Omt都灵机械车间有限公司 特别是燃料泵的液压泵

Also Published As

Publication number Publication date
WO1995025887A1 (fr) 1995-09-28
DE59504990D1 (de) 1999-03-11
EP0752061A1 (fr) 1997-01-08

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