EP2205852A2 - Kraftstoffeinspritzventil für eine brennkraftmaschine - Google Patents
Kraftstoffeinspritzventil für eine brennkraftmaschineInfo
- Publication number
- EP2205852A2 EP2205852A2 EP08804376A EP08804376A EP2205852A2 EP 2205852 A2 EP2205852 A2 EP 2205852A2 EP 08804376 A EP08804376 A EP 08804376A EP 08804376 A EP08804376 A EP 08804376A EP 2205852 A2 EP2205852 A2 EP 2205852A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- injection valve
- fuel
- sleeve
- valve member
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 92
- 239000007924 injection Substances 0.000 title claims abstract description 92
- 239000000446 fuel Substances 0.000 title claims abstract description 67
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 10
- 230000007423 decrease Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
- F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion
Definitions
- the invention is based on a fuel injection valve for an internal combustion engine according to the preamble of claim 1.
- Such a fuel injection valve is known from DE 103 52 736 Al.
- the actuator is in hydraulic operative connection via a pressure chamber with an injection valve member, which is also referred to as a nozzle needle.
- a control valve which controls the pressure in a control chamber by pressure relief to the low pressure area in otherwise conventional manner is not provided in this embodiment.
- the known from DE 103 52 736 type of actuation of the nozzle needle is referred to as a direct needle control.
- Injection is then initially reduced only the pressure in the pressure chamber, so that then not the full voltage level for actuating the nozzle needle is available.
- the pressure chamber with the high-pressure fuel area via a pressure relief valve.
- the pressure relief valve is dimensioned so that it can reduce the pressure peaks occurring as a result of the rapid increase in voltage to stand under system pressure high-pressure fuel area. This is before the injection of a lower pressure in the pressure chamber.
- the existing voltage level can then be used more effectively for actuating the nozzle needle, since then a lower pressure drop is required until reaching the opening pressure of the nozzle needle.
- FIG. 1 shows a longitudinal sectional view of a fuel injection valve according to the invention according to a first embodiment
- FIG. 2 shows a longitudinal sectional illustration of a fuel injection valve according to the invention in accordance with a second exemplary embodiment
- Figure 3 is a longitudinal sectional view of a fuel injection valve according to the invention according to a third embodiment.
- fuel injection valve 1 of Figure 1 first passes fuel from a fuel tank 2 by means of a high-pressure pump 3 via a high-pressure line 4 in a high-pressure fuel storage 5.
- terminals 6 are arranged, each leading to a cylinder of the internal combustion engine.
- Each of the terminals 6 is connected via a fuel supply line 7 with a fuel injection valve 1 designed according to the invention.
- the fuel injection valve 1 comprises a piston 8 designed as a piston, which is guided in a coupler housing 9, and an injection valve member 10, which may also be referred to as a nozzle needle.
- the injection valve member 10 is divided in a preferred embodiment of the fuel injection valve 1 into a translator section 11, a guide section 12 and a needle section 13.
- the piston 8, the coupler housing 9 and the injection valve member 10 are accommodated in a housing.
- the housing is divided into an injector housing part 14 and a nozzle housing part 15.
- the connection of the Injektorgepuruseteils 14 and the nozzle housing part 15 is preferably non-positively by means of a not shown here
- Nozzle clamping nut
- the fuel injection valve 1 comprises at least one injection opening 16, which can be closed by the needle portion 13 of the injection valve member 10. To close the
- Injection opening 16 the needle portion 13 of the injection valve member 10 is placed on a disposed above the injection port 16 seat 17. An axial movement for opening and closing the at least one injection opening 16 is ensured by the injection valve member 10 with its guide section 12 arranged in a nozzle housing part 15
- Needle guide 18 is guided.
- the translator section 11 of the injection valve member 10 is enclosed by a sleeve 19.
- the sleeve 19 serves as a lateral boundary of a pressure chamber 20.
- the sleeve 19 is provided with a sealing edge 21 which is pressed against a serving as a sealing seat shoulder 22 of the coupler housing 9 or as shown in Fig. 2 against an interposed throttle plate.
- the pressure chamber 20 is divided into a coupler space 20a and a control chamber 20b, wherein the piston 8, the coupler space 20a and the translator section 11 limit the control chamber 20b.
- a spring element 24 is supported.
- the spring element 24 is annular and surrounds the translator portion 11 of the injection valve member 10.
- spring elements 24 are suitable, for example
- the coupler housing 9 is fixed on a shoulder 31 on the nozzle housing part 15.
- the spring element 27 is accommodated in a first spring chamber 32, which is arranged between the coupler housing 9 and the inner wall 33 of the injector housing part 14.
- Coupler housing 9 is at least one groove 34, which is preferably axially aligned, added.
- the at least one groove 34, formed in paragraph 31 on the nozzle housing part 15 grooves 35 and at least one annular gap 36 which is formed between the outer wall 37 of the sleeve 19 and the inner wall 38 of the nozzle housing part 15, the first spring chamber 32 with a the translator section 11 of the injection valve member 10 surrounding the second spring chamber 39 in hydraulic communication.
- the at least one groove 34 and the grooves 35 in paragraph 31 of the nozzle housing part 15 are preferably aligned so that their positions coincide radially and axially.
- the second spring chamber 39 is connected via at least one channel, which is formed between at least one bevel 40 in the guide portion 12 of the injection valve member 10 and the needle guide 18, in hydraulic communication with a nozzle chamber 41st
- actuator which acts on an upper end face 42 of the piston 8.
- a piezoelectric actuator 43 is preferably used. But there are also electromagnet or hydraulic / mechanical actuator.
- the operation of the fuel injection valve 1 is hydraulically with under
- the fuel is provided by the fuel high pressure accumulator 5. Via the fuel supply line 7, the fuel flows into an annular space 44, which surrounds the piezoelectric actuator 43. Via a gap 45 between the piston 8 and the inner wall 33 of the injector housing part 14, the fuel under system pressure passes into the first spring chamber 32. On the at least one groove 34, the grooves 35 in paragraph 31 of the nozzle housing part 15 and the annular gap 36, the fuel flows into the second spring chamber 39. From there, the fuel passes along the at least one bevel 40 in the nozzle chamber 41. Due to the hydraulic Connections between the annular space 44, the first spring chamber 32, the second spring chamber
- the said channels of the fuel supply line 7 to the nozzle chamber 41 thus form a total of a high-pressure fuel area in the fuel injection valve 1, prevails in the system pressure.
- the piezoelectric actuator 43 is charged with a current (I), wherein a corresponding voltage (U) is applied.
- a change in length of the piezo actuator acts as follows:
- the piezoelectric actuator 43 For injecting fuel into the combustion chamber 52 of the internal combustion engine, the piezoelectric actuator 43 is discharged and the voltage U applied to the piezoelectric actuator 43 is lowered. As a result, the piezocrystals contract and the piezoactuator 43 contracts. Supported by the force exerted by the spring element 27 spring force, the piston 8 moves in the with the arrow 46 marked direction of movement. As a result, the lower end face 47 of the piston 8 moves out of the pressure chamber 20, which increases its volume. Due to the increasing volume of the pressure chamber 20, the pressure in the pressure chamber 20 decreases. Since the pressure in the pressure chamber 20 in this case drops below the system pressure, it is necessary that the
- connection between the sleeve 19 and the shoulder 22 in the coupler housing 9 is pressure-tight.
- the filling of the pressure chamber 20 takes place by guide leakage between the coupler housing 9 and the piston 8 and between the inside 43 of the sleeve 19 and the translator section 11 of the injection valve member 10th
- the piezoelectric actuator 43 For closing the at least one injection opening 16, the piezoelectric actuator 43 is energized again. The piezocrystals thereby expand and the piezoactuator 43 lengthens. As a result, the piston 8 again moves against the direction of movement indicated by the arrow 46 into the pressure chamber 20, whereby the volume of the pressure chamber 20 is reduced. This in turn increases the pressure in the pressure chamber 20 and thus the force acting on the end face 48 of the translator portion 11 of the injection valve member 10 hydraulic force. Once the force acting on the ring 25 spring force of the spring element 24 and the hydraulic force acting on the end face 48 on the translator portion 11 of the injection valve member 10 is greater than that on the pressure stages 50 and
- the injection valve member 10 moves toward the at least one injection port 16 and is placed on the seat 17.
- the at least one injection opening 16 is closed and the injection process into the combustion chamber 52 is terminated.
- the sleeve 19 is designed such that a pressure application surface 55 is formed on it, acts on the pressure prevailing in the pressure chamber 20 pressure and exerts a counter to the spring 24 directed force.
- the pressure application surface 55 is formed by a chamfer, which is arranged on the pressure chamber side on the inside of the sleeve 19.
- Spring 24 and the size of the pressure stage are dimensioned so that a pressure relief valve 56 is formed which opens at high system pressure over pressure in the pressure chamber 20 to the fuel high pressure area by the sealing edge 21 against the force of the spring when reaching the opening pressure of paragraph 31 24 lifts and a gap to the back
- FIG. 2 shows a second embodiment of the invention is shown, which differs from the first embodiment in that between the coupler space 20a and the control chamber 20b, a throttle 57 is arranged.
- FIG. 3 shows a third embodiment of the invention, in which the pressure relief valve 56 is arranged in the coupler space 20b.
- a sleeve 19a is guided for this purpose, which is acted upon by a spring element 24a in a closed position.
- a sealing edge 21a is formed, which cooperates with a corresponding sealing seat.
- Coupler space side is formed on the sleeve 19a, a pressure application surface 55a in the form of a chamfer.
- the pressure application surface 55a and the spring element 24a are dimensioned so that the pressure relief valve 56 opens at a fuel pressure above the fuel inlet pressure, so that a pressure reduction takes place to the fuel inlet channel 7 out.
- the injection valve member 10 could be made in several parts and the translator section 11 could be connected to a push rod, the
- the pressure relief valve 56 may also be formed by a conventional pressure relief valve of known type.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007051554A DE102007051554A1 (de) | 2007-10-29 | 2007-10-29 | Kraftstoffeinspritzventil für eine Brennkraftmaschine |
| PCT/EP2008/062436 WO2009056395A2 (de) | 2007-10-29 | 2008-09-18 | Kraftstoffeinspritzventil für eine brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2205852A2 true EP2205852A2 (de) | 2010-07-14 |
| EP2205852B1 EP2205852B1 (de) | 2011-08-03 |
Family
ID=40490281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08804376A Not-in-force EP2205852B1 (de) | 2007-10-29 | 2008-09-18 | Verfahren zum Betreiben einer Brennkraftmaschine mit einem Kraftstoffeinspritzventil |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2205852B1 (de) |
| AT (1) | ATE519032T1 (de) |
| DE (1) | DE102007051554A1 (de) |
| WO (1) | WO2009056395A2 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012212614A1 (de) | 2012-07-18 | 2014-01-23 | Continental Automotive Gmbh | Piezoinjektor mit hydraulisch gekoppelter Düsennadelbewegung |
| DE102012222509A1 (de) | 2012-12-07 | 2014-06-12 | Continental Automotive Gmbh | Piezoinjektor |
| DE102012223934B4 (de) * | 2012-12-20 | 2015-10-15 | Continental Automotive Gmbh | Piezoinjektor |
| GB201420017D0 (en) * | 2014-11-11 | 2014-12-24 | Delphi International Operations Luxembourg S.�.R.L. | Hydraulic lash adjuster arrangement ina servo injector |
| CN114151240A (zh) * | 2021-11-19 | 2022-03-08 | 哈尔滨工程大学 | 单体泵控制式多阀氨燃料喷射系统 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10352736A1 (de) | 2003-11-12 | 2005-07-07 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkter Nadeleinspritzung |
| DE102005032841B4 (de) | 2005-07-14 | 2017-06-14 | Robert Bosch Gmbh | Ziehender Betrieb eines Einspritzventils mit Spannungsabsenkung zwischen Einspritzungen |
| DE102005059169A1 (de) * | 2005-12-12 | 2007-06-14 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkt betätigbarem Einspritzventilglied |
| DE102006036444A1 (de) * | 2006-03-30 | 2007-10-04 | Robert Bosch Gmbh | Kraftstoffinjektor |
-
2007
- 2007-10-29 DE DE102007051554A patent/DE102007051554A1/de not_active Withdrawn
-
2008
- 2008-09-18 EP EP08804376A patent/EP2205852B1/de not_active Not-in-force
- 2008-09-18 AT AT08804376T patent/ATE519032T1/de active
- 2008-09-18 WO PCT/EP2008/062436 patent/WO2009056395A2/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009056395A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE519032T1 (de) | 2011-08-15 |
| DE102007051554A1 (de) | 2009-04-30 |
| WO2009056395A3 (de) | 2009-06-18 |
| EP2205852B1 (de) | 2011-08-03 |
| WO2009056395A2 (de) | 2009-05-07 |
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