EP0752061B1 - Anordnung zur einspritzung von kraftstoff in die zylinder einer brennkraftmaschine - Google Patents
Anordnung zur einspritzung von kraftstoff in die zylinder einer brennkraftmaschine Download PDFInfo
- 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
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
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims (6)
- Anordnung zur Einspritzung von Kraftstoff in die Zylinder einer Brennkraftmaschine mit Hilfe von Einspritzventilen,mit einem Hochdruckspeicher für den Kraftstoff, an den die Einspritzventile angeschlossen sind und der über eine Hochdruckpumpe (9, 10) mit Kolben (11, 12), mit einem saugseitigen und einem druckseitigen Rückschlagventil (7,17; 8, 18) sowie über eine Niederdruckpumpe (1) an einen Kraftstoffbehälter (2) angeschlossen ist,mit einer Steuereinheit (21) zur Einstellung des Krafstoffstromes vor dem saugseitigen Rückschlagventil (7, 8) der Hochdruckpumpe abhängig von Parametern der Brennkraftmaschine, wobei die Hochdruckpumpe (9, 10) ungesteuert ausgebildet ist und deren Kolben (11, 12) federbelastet ist,
daß das saugseitige Rückschlagventil (7, 8) als
Differenzdruckventil ausgebildet ist, daß das Differenzdruckventil(7, 8) so gewählt ist, daß es bei einer vorgegebenen Druckdifferenz von 0,5 bar öffnet, so daß eine Hohlraumbildung über dem Kolben (11, 12) in dem Kompressionsraum (15, 16) und nicht in der saugseitigen Leitung (6), die zur Hochdruckpumpe (9) geführt ist, erfolgt. - Anordnung nach Anspruch 1,
gekennzeichnet durch eine von der Steuereinheit (21) steuerbare Niederdruckpumpe. - Anordnung nach Anspruch 1,
dadurch gekennzeichnet, daß zwischen dem saugseitigen Rückschlagventil (7, 8) der Hochdruckpumpe (9, 10) und der einen annähernd konstanten Ausgangsdruck liefernden Niederdruckpumpe (1) ein durch die Steuereinheit (21) steuerbares Steuerventil (4) liegt. - Anordnung nach Anspruch 1,
dadurch gekennzeichnet, daß als saugseitiges Rückschlagventil eine Ventilscheibe (28) in Verbindung mit einem Ventilsitz (29) und einer Tellerfeder (27) dient, die den saugseitigen Zulauf zur Kompressionskammer der Hochdruckpumpe unter der Vorspannung der Tellerfeder (27) abschließt. - Anordnung nach Anspruch 1,
dadurch gekennzeichnet, daß die Hochdruckpumpe mindestens zwei Kolben (11, 12) hat, deren Bewegungsabläufe so gesteuert werden, daß sich jeweils nur ein Kolben in der Ansaugphase befindet. - Verfahren zur Einspritzung von Kraftstoff in die Zylinder einer Brennkraftmaschine mit Hilfe von Einspritzventilen, mit einem Hochdruckspeicher für den Kraftstoff, an dem die Einspritzventile angeschlossen sind und der über eine Hochdruckpumpe (9, 10) mit Kolben (11, 12) mit einem saugseitigen und einem druckseitigen Rückschlagventil (7, 17; 8, 18) sowie über eine Niederdruckpumpe (1) an einen Kraftstoffbehälter (2) angeschlossen ist, mit einer Steuereinheit zur Einstellung des Kraftstoffstromes vor dem saugseitigen Rückschlagventil (7, 8) der Hochdruckpumpe abhängig von Parametern der Brennkraftmaschine, wobei die Hochdruckpumpe (9, 10) ungesteuert ausgebildet ist und deren Kolben (11, 12) federbelastet ist, dadurch gekennzeichnet, daß als saugseitiges Rückschlagventil (7, 8) ein Differenzdruckventil verwendet wird, daß das Differenzdruckventil (7, 8) geöffnet wird, wenn eine vorgegebene Druckdifferenz von 0,5 bar zwischen der saugseitigen Leitung (6), die zur Hochdruckpumpe (9) geführt ist, und dem Kompressionsraum (15, 16) der Hochdruckpumpe (9) auftritt, so daß eine Hohlraumbildung nur über dem Kolben (11, 12) im Kompressionsraum (15, 16) der Hochdruckpumpe (9) erzeugt wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4410024 | 1994-03-23 | ||
DE4410024 | 1994-03-23 | ||
PCT/DE1995/000286 WO1995025887A1 (de) | 1994-03-23 | 1995-03-03 | Anordnung zur einspritzung von kraftstoff in die zylinder einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0752061A1 EP0752061A1 (de) | 1997-01-08 |
EP0752061B1 true EP0752061B1 (de) | 1999-01-27 |
Family
ID=6513623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95911205A Expired - Lifetime EP0752061B1 (de) | 1994-03-23 | 1995-03-03 | Anordnung zur einspritzung von kraftstoff in die zylinder einer brennkraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0752061B1 (de) |
DE (1) | DE59504990D1 (de) |
WO (1) | WO1995025887A1 (de) |
Cited By (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19541507A1 (de) * | 1995-11-08 | 1997-05-15 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
WO2000011342A1 (de) * | 1998-08-25 | 2000-03-02 | Siemens Aktiengesellschaft | 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 (de) * | 2001-12-19 | 2003-07-02 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0270720A1 (de) * | 1986-12-12 | 1988-06-15 | Regie Nationale Des Usines Renault | Pumpe mit variablem Durchfluss |
CH674243A5 (de) * | 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. |
-
1995
- 1995-03-03 DE DE59504990T patent/DE59504990D1/de not_active Expired - Lifetime
- 1995-03-03 EP EP95911205A patent/EP0752061B1/de not_active Expired - Lifetime
- 1995-03-03 WO PCT/DE1995/000286 patent/WO1995025887A1/de active IP Right Grant
Cited By (2)
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 |
---|---|
DE59504990D1 (de) | 1999-03-11 |
WO1995025887A1 (de) | 1995-09-28 |
EP0752061A1 (de) | 1997-01-08 |
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