EP1177374A1 - Kraftstoffeinspritzventil - Google Patents
KraftstoffeinspritzventilInfo
- Publication number
- EP1177374A1 EP1177374A1 EP01913577A EP01913577A EP1177374A1 EP 1177374 A1 EP1177374 A1 EP 1177374A1 EP 01913577 A EP01913577 A EP 01913577A EP 01913577 A EP01913577 A EP 01913577A EP 1177374 A1 EP1177374 A1 EP 1177374A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure chamber
- control pressure
- nozzle needle
- throttle piston
- injection 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.)
- Granted
Links
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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/161—Means for adjusting injection-valve lift
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- 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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
Definitions
- the invention relates to a fuel injection valve with a valve body, a control pressure chamber then formed, which is closed on one side by an actuating part for a nozzle needle which, controlled by the actuating part, can be displaced between a closed position and an open position, an inlet to the control pressure chamber and with one Outflow from the control pressure chamber, which is controlled by a control valve
- Such a control valve is known, for example, from DE 197 27 896 A1 and serves to open a nozzle needle of the injection valve in order to inject fuel into a cylinder of an internal combustion engine
- An opening pressure is constantly applied to the nozzle needle, which tries to lift the nozzle needle from the assigned valve seat.
- This opening force counteracts a closing force which is exerted on the actuating part in the control pressure chamber.
- the closing force generated there higher than the opening force acting on the nozzle needle, so that the actuating part remains closed in the shooting position and consequently the nozzle needle.
- the opening force manages to actuate the actuating part into the open position move, allowing the nozzle needle to lift off the valve seat. Fuel can now be injected
- the pressure in the control pressure chamber is controlled by the control valve by closing or opening the outlet.When closing the outlet, the medium supplied to the control pressure chamber, usually fuel, is accumulated, a high pressure is generated in the control pressure chamber which keeps the nozzle needle in a closed state the control valve opens the drain, the pressure in the control pressure chamber drops so that the nozzle needle can open
- the nozzle needle In order to be able to inject different amounts of fuel depending on the respective operating conditions, it is desirable for the nozzle needle to be able to carry out a controlled partial opening stroke, that is to say a stroke which is smaller than a complete opening stroke from the closed position to the open position.
- a controlled partial opening stroke that is to say a stroke which is smaller than a complete opening stroke from the closed position to the open position.
- the course and size of such a stroke Partial opening stroke depends in particular on the throttling effect of the inlet to the control pressure chamber and the outlet from the control pressure chamber, on the pressure build-up at the various points of the nozzle, the temperature of the moving masses and, above all, the friction on the moving parts Partial opening stroke usually a comparatively large spread of the injection quantity
- the object of the invention is then to further develop a fuel injection valve of the type mentioned at the outset such that the injection quantity can be controlled more precisely during a partial opening stroke of the nozzle needle
- control valve according to the invention with the features of the characterizing part of claim 1 has the advantage that at the end of the partial opening stroke of the nozzle needle there is a considerable increase in resistance, which Counteracts further opening of the nozzle needle. This results in a striking threshold between a lower opening force which only leads to a partial opening stroke of the nozzle needle and a higher opening force which leads to a complete opening stroke of the nozzle needle, which enables a precise, partially open state of the nozzle needle
- the throttle piston is arranged in the outlet from the control pressure chamber and is provided with a throttle bore, the transition of the throttle piston from the first to the second position being defined in that the throttle piston comes into contact with a stop
- the throttle piston is displaced by the fluid flowing out of the control pressure chamber during the partial opening stroke.
- a comparatively low resistance is opposed to the fluid flowing out of the control pressure chamber only after the throttle piston touches the stop the fluid that leaves the control pressure chamber is forced to flow through the throttle bore.
- a further opening stroke of the nozzle needle is opposed by a higher resistance.
- the size of the partial opening stroke of the nozzle needle can be carried out with little effort in this embodiment d can be set by suitable selection of the cross-section of the throttle piston and the possible stroke up to the stop
- the throttle piston is arranged between the actuating part and the nozzle needle and is provided with a groove which interacts with a control edge, the transition of the throttle piston from the first to the second position being defined in that the control edge overlaps with the groove
- the throttle piston forms a slide which, by closing the groove, closes a drain from a space into which the nozzle needle protrudes and from which it has to displace fluid when the fluid is opened again be determined directly by the When the nozzle needle is closed, there is a distance between the end of the groove and the control edge
- FIG. 1 shows a schematic view of a fuel injection valve according to the prior art
- FIG. 2 shows an enlarged view of part of the fuel injection valve from FIG. 1,
- FIG. 3 in a view corresponding to that of Figure 2 shows a section of a fuel injection valve according to a first embodiment of the invention
- FIG. 1 shows a conventional fuel injection valve with control valve (see FIG. 2).
- the fuel injection valve has a valve body 10, in which a nozzle needle 12 is slidably attached.
- the nozzle needle 12 controls the injection of the fuel into a cylinder of an internal combustion engine (not shown)
- Fuel exerts an opening force on the nozzle needle 12 which the nozzle needle and an actuating part 14, on which the nozzle needle 12 is supported, seeks to adjust to a control pressure chamber 16
- the control pressure chamber 16 is also supplied with fuel which, due to the pressure prevailing in the control pressure chamber 16, exerts a closing force on the actuating part 14.
- the fuel is provided via an inlet 18 and an outlet 20 leads from the control pressure chamber 16, which leads to a control chamber 22 of a control valve 24 for the control valve 24 represents the outlet 20, in turn, the inlet, and an outlet 26 is provided through which the fuel can flow out of the control pressure chamber 16 and the control chamber 22
- the control valve 24 has a valve needle 28 in the control chamber 22, which cooperates with a valve seat 30.
- the control valve 24 is closed, so that the fuel supplied via the inlet 18 to the control pressure chamber 16 is accumulated therein
- the high pressure generated in this way exerts a closing force on the actuating part 14 which is greater than the opening force acting on the nozzle needle 12.
- the actuating part 14 is thus in the closed position and the fuel is closed spontaneously Valve seat 30 is lifted off, the fuel can flow out of the control pressure chamber 16 via the control chamber 22 and the outlet 26, so that the pressure in the control pressure chamber drops
- the then reduced closing force enables the actuating part to move from the closed position into the open position, so that the nozzle needle opens. It is now fuel injected
- a fuel injection valve according to a first embodiment of the invention is described below with reference to FIG. 3.
- a throttle piston 32 which is provided with a throttle bore 34, is arranged in the outlet from the control pressure chamber 16.
- the throttle piston is driven by a spring 36 in the starting position shown in the figure is acted upon in the direction of the actuating part 14.
- the throttle piston 32 can be displaced in the outlet 20 against the action of the spring 36 by a distance s, after a displacement by the stroke s the throttle piston 32 comes to a stop 38 in investment
- the injection valve described works in the following manner. When the valve needle (not shown in FIG. 3) is lifted off the valve seat 30, the fluid provided via the inlet 18 can flow out of the control pressure chamber 16.
- the throttle piston 32 is countered from its first position shown in FIG the effect of the spring 36, since the flow through the throttle bore 34 can initially be neglected.
- the fluid flowing out of the control pressure chamber 16 enables the actuating part 14 to move upward with respect to FIG. 3, so that the nozzle needle opens
- a fuel injection valve according to a second embodiment of the invention is described below with reference to FIG. 4.
- the same reference numerals are used for the components which are known from the preceding description, and reference is made to the above explanations
- the throttle piston 32 is displaceably arranged in a guide sleeve 44 which is pressed into the valve body 10 between the actuating part 14 and the nozzle needle 12.
- the throttle piston 32 lies with its lower end with respect to FIG. 4 directly on the nozzle needle 12 while on its 4, the actuating part 14 is supported on the upper end.
- a nozzle spring 42 is also supported on the throttle piston 32 and acts on the nozzle needle 12 in its closed position. Since the actuating part is not supported directly on the nozzle needle, no lateral forces can be transmitted from the actuating part to the nozzle needle
- the throttle piston 32 is provided with a groove 44 which is designed as a ground, flat surface on the outer wall of the throttle piston 32.
- the groove 44 interacts with a control edge 46 which is formed by the edge of the guide sleeve 40 facing the nozzle needle 12 between the nozzle needle and a leakage collecting space 48, into which the throttle piston projects, is arranged at the edge of the guide sleeve 40
- the described valve operates in the following manner.
- the fluid present in the leakage collecting space 48 can escape through the groove 44 as long as the lower end of the groove 44 lies below the control edge. As soon as the throttle piston 32 is displaced by the stroke s, the control edge 46 closes the groove 44 in this way that the fluid in the leakage collecting space 48 can only escape through the play between the throttle piston 32 and the guide sleeve 40
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10006111A DE10006111A1 (de) | 2000-02-11 | 2000-02-11 | Kraftstoffeinspritzventil |
DE10006111 | 2000-02-11 | ||
PCT/DE2001/000449 WO2001059289A2 (de) | 2000-02-11 | 2001-02-06 | Kraftstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1177374A1 true EP1177374A1 (de) | 2002-02-06 |
EP1177374B1 EP1177374B1 (de) | 2005-04-27 |
Family
ID=7630600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01913577A Expired - Lifetime EP1177374B1 (de) | 2000-02-11 | 2001-02-06 | Kraftstoffeinspritzventil |
Country Status (7)
Country | Link |
---|---|
US (1) | US20020134852A1 (de) |
EP (1) | EP1177374B1 (de) |
JP (1) | JP2003522881A (de) |
BR (1) | BR0104462A (de) |
CZ (1) | CZ20013656A3 (de) |
DE (2) | DE10006111A1 (de) |
WO (1) | WO2001059289A2 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10132450B4 (de) * | 2001-07-04 | 2010-02-11 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE10160264A1 (de) * | 2001-12-07 | 2003-06-18 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
DE102006008648A1 (de) * | 2006-02-24 | 2007-08-30 | Robert Bosch Gmbh | Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine |
DE102007035739A1 (de) | 2007-07-30 | 2009-02-05 | Robert Bosch Gmbh | Kraftstoffeinspritzventileinrichtung |
DE102009007095A1 (de) * | 2009-02-02 | 2010-08-05 | Continental Automotive Gmbh | Einspritzventil |
DE102011051861A1 (de) | 2011-07-15 | 2012-12-27 | L'orange Gmbh | Kraftstoff-Einspritzinjektor |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3952711A (en) * | 1975-03-04 | 1976-04-27 | Ambac Industries, Inc. | Diesel injection nozzle with independent opening and closing control |
DE3220398A1 (de) * | 1982-01-26 | 1983-07-28 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
DE3221442A1 (de) * | 1982-06-07 | 1983-12-08 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einssritzduese fuer brennkraftmaschinen |
DE3318887A1 (de) * | 1983-05-25 | 1984-11-29 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
DE3405161A1 (de) * | 1984-02-14 | 1985-08-22 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
US4986472A (en) * | 1989-09-05 | 1991-01-22 | Cummins Engine Company, Inc. | High pressure unit fuel injector with timing chamber pressure control |
US5779149A (en) * | 1996-07-02 | 1998-07-14 | Siemens Automotive Corporation | Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke |
DE19727896A1 (de) | 1997-07-01 | 1999-01-07 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
-
2000
- 2000-02-11 DE DE10006111A patent/DE10006111A1/de not_active Ceased
-
2001
- 2001-02-06 US US09/958,695 patent/US20020134852A1/en not_active Abandoned
- 2001-02-06 EP EP01913577A patent/EP1177374B1/de not_active Expired - Lifetime
- 2001-02-06 WO PCT/DE2001/000449 patent/WO2001059289A2/de active IP Right Grant
- 2001-02-06 BR BR0104462-1A patent/BR0104462A/pt not_active Application Discontinuation
- 2001-02-06 JP JP2001558601A patent/JP2003522881A/ja active Pending
- 2001-02-06 CZ CZ20013656A patent/CZ20013656A3/cs unknown
- 2001-02-06 DE DE50106008T patent/DE50106008D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0159289A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20020134852A1 (en) | 2002-09-26 |
DE50106008D1 (de) | 2005-06-02 |
JP2003522881A (ja) | 2003-07-29 |
WO2001059289A3 (de) | 2001-12-06 |
WO2001059289A2 (de) | 2001-08-16 |
BR0104462A (pt) | 2002-01-08 |
CZ20013656A3 (cs) | 2003-02-12 |
EP1177374B1 (de) | 2005-04-27 |
DE10006111A1 (de) | 2001-08-30 |
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