EP3759336A1 - Injektor zum einspritzen von kraftstoff - Google Patents
Injektor zum einspritzen von kraftstoffInfo
- Publication number
- EP3759336A1 EP3759336A1 EP19715029.5A EP19715029A EP3759336A1 EP 3759336 A1 EP3759336 A1 EP 3759336A1 EP 19715029 A EP19715029 A EP 19715029A EP 3759336 A1 EP3759336 A1 EP 3759336A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- injector
- line
- seat plate
- control 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.)
- 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
- 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
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
-
- 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
- F02M47/025—Hydraulically actuated valves draining the chamber to release the 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
- 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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
- F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
-
- 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
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
Definitions
- the present invention relates to an injector for injecting fuel.
- An injector typically has a nozzle needle (also called an injector needle) that allows a high pressure fuel to escape when an exit hole of the injector is released.
- This nozzle needle acts in conjunction with this outlet opening like a plug, which at a Lifting allows the fuel to escape. Accordingly, it is therefore necessary to lift this needle in relatively short time intervals and to let slide back into the outlet opening after a short time.
- hydraulic servo valves can be used, which control the triggering of this movement. Such valves in turn are controlled by means of an electromagnet.
- so-called servo valves are used instead of the direct control, which control the nozzle needle and are themselves controlled by a solenoid valve.
- a pressure level which acts on the nozzle needle in the closing direction is established in a control space cooperating with the nozzle needle with the aid of the fuel which is available under high pressure.
- This control chamber is typically connected via a supply line to the high-pressure region of the fuel.
- this control chamber also: lower control chamber
- this control chamber has a line to a valve chamber (also: upper control chamber), which has a closable outlet throttle, from which the high-pressure fuel can escape to a low-pressure region.
- the pressure in the valve chamber and the control chamber decreases, whereby the closing force acting on the nozzle needle is reduced because the high-pressure fuel of the valve chamber and the control chamber can drain.
- the outlet throttle in the seat plate of the injector of the valve is thus optionally closed or opened by means of an anchor element.
- the pilot valve and the outlet throttle of the seat plate comprehensive pilot valve in turn can be brought by means of an electromagnet in the desired position.
- the armature element In an energized state of the electromagnet, the armature element is attracted against the force exerted by the spring element spring force, so that there is a compression of the spring, and the flow restrictor releases in the seat plate.
- the high-pressure fuel thus flows via the throttle bore of the seat plate into a low-pressure region.
- the pressure reduction in the control chamber results in the result of raising the nozzle needle from its nozzle seat.
- the injector for injecting fuel comprises a seat plate with a throttle bore, a valve insert which is arranged on one of the flat sides of the seat plate, a valve guide for receiving the valve core, a nozzle needle which is arranged on the side opposite the seat plate of the valve core, a valve space for receiving fuel, wherein the valve space is limited by the seat plate and the valve insert and extends to the throttle bore of the seat plate, a control chamber for receiving fuel, wherein the control chamber is limited by the valve core and the nozzle needle, and a first line, which connects the control room and the valve room.
- the invention is characterized in that the injector has a second conduit which connects the control chamber and the valve chamber with each other.
- the second line also: bypass line
- the second line allows for improved part application in production.
- the stroke progression of the nozzle needle which is decisively influenced by the flow from the control chamber into the valve chamber, is relevant for the precise injection of minute quantities (eg in the case of multiple injection).
- the flow rate of the first line, or the outlet throttle in ml / min must therefore be set exactly to a nominal value with the lowest possible tolerance. Sets the defined flow rate over the sum of the flow rates of the first line, such as, for example, a drain throttle, and second line, for example.
- an emergency operation of the injector is ensured by the presence of a second connecting line between the control room and the valve chamber, with a complete failure of the injector can be bypassed. That for the
- the first line and / or the second line is a bore.
- a particularly simple production of the lines is possible.
- a laser drilling can be used, with which the minimum cross-sectional area of the first line and / or the second line can be defined very accurately.
- the minimum cross-sectional area of the second conduit is smaller than the minimum cross-sectional area of the first conduit.
- the flow rate of fuel for the first conduit 9 is more than twice that of the second conduit 10.
- first line and the second line are identical. It is preferably provided that the first line and the second line permanently connect the control chamber with the valve chamber in each operating state of the injector. This makes it clear that regardless of any Operating conditions of the injector, the first line and the second line connect the control chamber and the valve chamber together.
- the first line is arranged in the valve insert or in the valve guide.
- the second line which can also be arranged in the valve insert or in the valve guide.
- the first line and the second line are arranged in different components.
- the second line is formed by a game of leadership of the valve core in the valve guide.
- the second line is thus implemented by a game in the fit with the valve insert receiving valve guide. Accordingly, in a manufacturing process of the injector according to the invention no separate second bore or the like must take place, since the second line is converted by the guide play. This is done by appropriate dimensioning of the valve guide and the valve core. Instead of a sealing seat of the valve core, there is an intentional leakage flow, which is considered a second line. There are advantages in production.
- the injector has a closure element for closing the throttle bore of the seat plate, wherein the closure element is arranged on the side opposite the valve insert side of the seat plate.
- This closure element is often also called anchor or anchor element and is designed to close the passage throttle. This leads to a closure of the process towards the low pressure area, so that it through an inflow of fuel under high pressure, which takes place via the inlet throttle, leading to an increase in pressure in the valve chamber and in the control chamber.
- the valve insert is movably mounted in the valve guide and migrates at identical pressure conditions in the control chamber and the valve chamber in the direction of the nozzle needle and thereby opens a supply line in the valve guide, which connects a high-pressure region of the fuel with the control chamber.
- the control chamber is flooded even faster with fuel under high pressure, so that the nozzle needle reacts faster.
- valve insert migrates in the direction of the seat plate and thereby closes the supply line in the valve guide.
- the second line is designed to pass the required for a functionality of the injector expiration amount of fuel from the control chamber into the valve chamber.
- the invention further comprises an internal combustion engine with an injector according to one of the preceding claims.
- 1 is a sectional view of an injector for fuel injection
- 2a-d an enlarged detail around the seat plate of the injector in different states of an injector cycle
- 3a-b an enlarged section around the seat plate of an injector according to the invention from different view sides
- Fig. 6 is a table for explaining the improved parts application in an injector according to the invention.
- Fig. 1 shows a sectional view of an injector for injecting fuel.
- the injector 1 comprises a housing 22 which is provided with a closure cap 31 at the end facing away from the nozzle 24.
- the electrical connections 18 for activating the injector 1 extend from the closure cap 31.
- the connections 18 are connected to an electromagnet 19, which in the energized state counter to the spring force of the compression spring 21, the armature 11 from the sealing position of the passage throttle of the seat plate. 2 takes off.
- the compression spring 21 rests against a disc 20 at its end remote from the armature 11.
- the armature 11 is surrounded by the armature guide 29, to which a pressure screw 29 is adjacent.
- the area above the seat plate 2, which extends starting from the passage throttle of the seat plate 2 toward the armature 11 is the low pressure region of the injector 1.
- the Flochtik Colour the injector 1 extends from the throttle bore of the seat plate 2 toward the nozzle 24.
- the armature 11 opposite side of the seat plate 2 adjoins the valve guide 5 and the valve insert 4 received therein.
- the compression spring 27 engages, which serves to Nozzle needle 6 to urge over a laid on a projection of the nozzle needle 6 disc 26 in its closed position.
- the nozzle lock nut 25 and the sealing washer 23 complete the structure of the injector 1.
- the FIGS 2a-d show an enlarged view of an injector in the area around its seat plate 2. It should be noted that these figures do not have the characterizing feature of the present invention. For better understanding, force arrows and flow arrows for the path of the fuel are shown in the figures.
- Fig. 2a shows a state in which the pilot valve (that is, the armature 11 and the passage throttle 3) are closed and no injection takes place.
- the pilot valve that is, the armature 11 and the passage throttle 3
- In the initial state are due to the inflow of high-pressure fuel through the inlet throttle 13 in both the valve chamber 7 and in the control chamber 8 before equal pressure conditions.
- the inflowing via the inlet throttle 13 in the valve chamber 7 fuel is guided via the first line 9 and into the control chamber 8.
- the armature 11 In the de-energized state of the electromagnet 19, the bore 3 of the seat plate 2 by the armature 11, by means of the bias of the compression spring 21, closed. In this case, the armature 11 separates the high-pressure region from the low-pressure region. By driving the electromagnet 19, the armature 11 is attracted and the bore 3 in the seat plate 2 is released. The pressure below the seat plate 2 is lowered so that the valve insert 4 is tightened against the lower edge of the valve guide 5.
- Fig. 2c shows a state in which the pilot valve is closing, but an injection is still present.
- the return spring 21 pushes the armature 11 back into the flat seat on the seat plate 2 and seals the passage throttle 3 from.
- the fuel can no longer escape into the low-pressure region and the pressure in the valve chamber 7 above the valve core 4 increases (due to the continuous inflow of high-pressure fuel via the inlet throttle 13).
- Fig. 2d shows a state in which the pilot valve is closed, the needle 6 closes and thereby the injection is terminated.
- the illustrated sectional plane is rotated relative to the sectional planes of FIGS. 2-c in order to be able to explain elements not previously shown.
- the closure element 11 acts in a known manner with the passage throttle 3 of the seat plate 2 together.
- the valve chamber 7 is connected via an inlet throttle 13 to the high-pressure region. Adjacent to the valve chamber
- first line 9 which connects the valve chamber 7 with the control chamber 8.
- second line 10 also: bypass
- the second line 10 is also advantageous in the manufacture of parts, since thus the total flow rate of fuel from the control chamber 8 in the valve chamber 7, can be specified even more precisely.
- the amount of outflowing fuel is very important for the lifting behavior of the needle from its closed position.
- Fig. 3b shows a sectional view, the sectional plane is rotated in comparison to the view of Fig. 3a by 90 °.
- the valve insert 5 moves in the direction of the needle 6, a gap is created between the lower edge of the valve guide 5 and the feed lines 12 introduce fuel under high pressure via the detour of at least one connecting bore 16 into the control chamber 8.
- the reference numeral 17 indicates the high-pressure region of the fuel. 4 shows the results of a simulation during operation of the injector according to the invention.
- the graph A shows the results for a system pressure of 2200 bar, in which the outlet throttle (corresponding to the first line 9) as well as the bypass (corresponding to the second line 10) is free. So this represents the error-free operation of the injector.
- the graph B shows the results for a system pressure of 2200 bar, in which the outlet throttle (corresponding to the first line 9) clogged and the bypass (corresponding to the second line 10) is free. This therefore represents the faulty operation of the injector. It can be seen that despite the clogged first line, the injector still injects fuel. An emergency operation is therefore guaranteed.
- the graph C shows the results for a system pressure of 350bar, in which the outlet throttle (corresponding to the first line 9) as well as the bypass (corresponding to the second line 10) is free. So this represents the error-free operation of the injector.
- the graph D shows the results for a system pressure of 350 bar, in which the outlet throttle (corresponding to the first line 9) clogged and the bypass (corresponding to the second line 10) is free. So this is the faulty one Operation of the injector. It can be seen that despite the clogged first line of the injector still injects fuel. An emergency operation is therefore guaranteed.
- FIG. 5 shows the improvement of the tolerance in the determined flow rate of fuel from the control chamber into the valve chamber when using the injector according to the invention.
- the bypass 10 allows for improved parts delivery in production.
- the stroke course of the nozzle needle 6, which is decisively influenced by the flow from the control chamber 8 into the valve chamber 7, is relevant for the precise injection of minute quantities (eg in the case of multiple injection).
- the flow rate of the outlet throttle 9 in ml / min must therefore be set exactly to a nominal value with the lowest possible tolerance. Sets the defined flow rate flow over the sum of the flow rates of outlet throttle 9 and 10 bypass, resulting in a lower average scatter of the
- Step 1 the total flow rate of the flow rate of the outlet throttle 9 and the flow of the bypass 10 is composed.
- the standard deviations s and the scattering widths 3s of the discharge flows are as shown in FIG. 6.
- the standard deviation 3s of the total discharge flow rate could be reduced from 3.15 to 2.42 with respect to the conventional series design in the inventive control valve concept ,
- the control valve concept according to the invention therefore results in an improved part application in production.
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 (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018107238.4A DE102018107238A1 (de) | 2018-03-27 | 2018-03-27 | Injektor zum Einspritzen von Kraftstoff |
| PCT/EP2019/057671 WO2019185682A1 (de) | 2018-03-27 | 2019-03-27 | Injektor zum einspritzen von kraftstoff |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3759336A1 true EP3759336A1 (de) | 2021-01-06 |
| EP3759336B1 EP3759336B1 (de) | 2023-03-15 |
Family
ID=66001190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19715029.5A Active EP3759336B1 (de) | 2018-03-27 | 2019-03-27 | Injektor zum einspritzen von kraftstoff |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3759336B1 (de) |
| DE (1) | DE102018107238A1 (de) |
| ES (1) | ES2946084T3 (de) |
| WO (1) | WO2019185682A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19939939A1 (de) * | 1999-08-23 | 2001-04-19 | Bosch Gmbh Robert | Injektor für ein Common-Rail-Einspritzsystem für Brennkraftmaschinen mit kompakter Bauweise |
| WO2005019637A1 (de) * | 2003-08-22 | 2005-03-03 | Ganser-Hydromag Ag | Pilotventil gesteuertes brennstoffeinspritzventil |
| BRPI0708551B1 (pt) * | 2006-03-03 | 2019-07-02 | Ganser-Hydromag Ag | Válvula de injeção de combustível para a injeção intermitente de combustível dentro da câmara de combustão de um motor de combustão interna |
| DE102012220025A1 (de) * | 2012-06-29 | 2014-01-02 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| DE102014211287A1 (de) * | 2014-06-12 | 2015-12-17 | Engineering Center Steyr Gmbh & Co. Kg | Fluid-Einspritzvorrichtung für eine Verbrennungskraftmaschine |
| CH710127A1 (de) * | 2014-09-17 | 2016-03-31 | Ganser Crs Ag | Brennstoffeinspritzventil für Verbrennungskraftmaschinen. |
-
2018
- 2018-03-27 DE DE102018107238.4A patent/DE102018107238A1/de not_active Withdrawn
-
2019
- 2019-03-27 EP EP19715029.5A patent/EP3759336B1/de active Active
- 2019-03-27 WO PCT/EP2019/057671 patent/WO2019185682A1/de not_active Ceased
- 2019-03-27 ES ES19715029T patent/ES2946084T3/es active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019185682A1 (de) | 2019-10-03 |
| ES2946084T3 (es) | 2023-07-12 |
| DE102018107238A1 (de) | 2019-10-02 |
| EP3759336B1 (de) | 2023-03-15 |
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