CN103244321B - Dual-fuel dual-piezoelectric control type injector - Google Patents
Dual-fuel dual-piezoelectric control type injector Download PDFInfo
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- CN103244321B CN103244321B CN201310155719.8A CN201310155719A CN103244321B CN 103244321 B CN103244321 B CN 103244321B CN 201310155719 A CN201310155719 A CN 201310155719A CN 103244321 B CN103244321 B CN 103244321B
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Abstract
The invention aims to provide a dual-fuel dual-piezoelectric control type injector. The dual-fuel dual-piezoelectric control type injector comprises an injector body, and further comprises a first piezoelectric stack control portion, a second piezoelectric stack control portion, a large needle valve injection device and a small needle valve injection device which are mounted in the injector body. The first piezoelectric stack control portion and the small needle valve injection device are mounted in the large needle valve injection device, the second piezoelectric stack control portion is mounted in the small needle valve injection device, the large needle valve injection device comprises a large needle valve, a large needle valve return spring and a large needle valve control piston in sequential connection, and the small needle valve injection device comprises a small needle valve, a small needle valve return spring and a small needle valve control piston in sequential connection. Two piezoelectric stacks are used for respectively flexibly controlling the two needle valves to rise and seat, asynchronous or synchronous injection of two kinds of liquid fuels can be achieved, and the injector can work in an arbitrary mono-fuel mode as well as in a dual-fuel mode.
Description
Technical field
What the present invention relates to is a kind of motor, the specifically oil sprayer of motor.
Background technique
The research and development of duel fuel engine are effective measures for optimization energy supply structure, the variation realizing fuel, solution energy crisis and environmental pollution problem.Realize the double fuel supply of diesel engine, and while realizing two kinds of fuel or spray separately and free adjusting simultaneously, the electronic fuel injection device of existing diesel is obviously unappeasable, existing dual-fuel diesel engine is all generally respectively to spraying into two kinds of fuel in cylinder with two spargers, owing to have employed two sparger burner oils, need to carry out larger change to original diesel engine, adds additional more annex, installation becomes very complicated, and the Economy of dual-fuel diesel engine is reduced.Moreover electromagnetic-valve control type fuel injector structure is complicated, and due to solenoid valve power on/off repeatedly, electromagnetic valve coil easily generates heat, and has had a strong impact on responding fast and accurately of solenoid valve, makes electromagnetic valve type fuel injector control difficulty and increase.
Summary of the invention
The object of the present invention is to provide and comprise two piezoelectric pile final controlling element, and then the dual-fuel dual-piezoelectric control type injector of the injection of control two kinds of liquid fuels.
The object of the present invention is achieved like this:
Dual-fuel dual-piezoelectric control type injector of the present invention, it is characterized in that: comprise injector body and be arranged on the first piezoelectric pile control section in injector body, second piezoelectric pile control section, large needle-valve injection apparatus, little needle-valve injection apparatus, first piezoelectric pile control section and little needle-valve injection apparatus are arranged in large needle-valve injection apparatus, second piezoelectric pile control section is arranged in little needle-valve injection apparatus, large needle-valve injection apparatus comprises the large needle-valve be connected successively, large needle-valve return spring, large needle-valve control piston, little needle-valve injection apparatus comprises the little needle-valve be connected successively, little needle-valve return spring, little noticeable degree piston, large needle valve pocket is formed between large needle-valve and injector body, little needle-valve chamber is formed between little needle-valve and large needle-valve, fuel oil handling equipment control room is formed between large needle-valve control piston and the first piezoelectric pile control section, second liquid fuel control chamber is formed between little noticeable degree piston and the second piezoelectric pile control section, injector body offers high pressure fuel passage, high pressure second liquid fuel channel, drainback passage, second liquid fuel current by pass, high pressure fuel passage is communicated with high pressure fuel entrance respectively, fuel oil handling equipment control room, large needle valve pocket, high pressure second liquid fuel channel is communicated with second liquid fuel control chamber respectively, little needle-valve chamber, drainback passage is communicated with return opening and connects the first piezoelectric pile control section, second liquid fuel current by pass is communicated with second liquid fuel relief port and connects the second piezoelectric pile control section.
The present invention can also comprise:
1, the first described piezoelectric pile control section comprises the first piezoelectric pile, first slip oil drain valve, first slip oil drain valve return spring, first slip eduction valve is depressed into the first piezoelectric pile lower end surface under the effect of the first slip eduction valve return spring, the first through flow hole is had in the middle of first slip eduction valve, side has first ring shape liquid holding groove, first through flow hole and the inner conducting of the first annular liquid holding groove, fuel oil handling equipment control room is communicated with the first through flow hole, the backward lower promotion first of first piezoelectric pile energising is slided eduction valve, the first annular oil holding slot on first slip oil drain valve and the first oil leak hole conducting, high pressure fuel in fuel oil handling equipment control room flow to drainback passage by the oil leak hole on injector body, when after the first piezoelectric pile power-off, first annular liquid holding groove and discharge orifice disconnect,
The second described piezoelectric pile control section comprises the second piezoelectric pile, second slip oil drain valve, second slip oil drain valve return spring, second slip eduction valve is depressed into the second piezoelectric pile lower end surface under the effect of the second slip eduction valve return spring, the second through flow hole is had in the middle of second slip eduction valve, side has the second annular liquid holding groove, second through flow hole and the inner conducting of the second annular liquid holding groove, second liquid fuel control chamber is communicated with the second through flow hole, the backward lower promotion second of second piezoelectric pile energising is slided eduction valve, the second annular oil holding slot on second slip oil drain valve and the second oil leak hole conducting, high pressure fuel in second liquid fuel control chamber flow to second liquid fuel current by pass by the second liquid fuel discharge orifice on the large needle-valve injection apparatus of spray, when after the second piezoelectric pile power-off, second annular liquid holding groove and second liquid fuel discharge orifice disconnect.
2, the end of large needle-valve and little needle-valve arranges the first spray orifice and the second spray orifice respectively, and the mode that the first spray orifice adopts center line to parallel with the second spray orifice is arranged.
Advantage of the present invention is: the present invention adopts lifting and taking a seat of two piezoelectric pile large and small two needle-valves of control flexible respectively, when can realize two kinds of liquid fuels poor or spray simultaneously, both at any one single-fuel MODE of operation, also work can be carried out under dual fuel mode.First can spray into the fuel that the point of ignition that sprays into after the low fuel of point of ignition is used for igniting is high during dual fuel mode, ensure the stability of burning.Piezoelectric pile is large to the degrees of freedom of two noticeable degree, and response rapidly, can control emitted dose, discharge time and jet law flexibly and accurately, can improve the discharge of marine diesel engine and the Economy of fuel further.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the first piezoelectric pile control section structural drawing of the present invention;
Fig. 3 is the second piezoelectric pile control section structural drawing of the present invention;
Fig. 4 is jet orifice structure figure of the present invention;
Fig. 5 is the slip oil drain valve of the first piezoelectric pile control section or the second piezoelectric pile control section shown in Fig. 2 or Fig. 3 of the present invention or the plan view of slip eduction valve;
The A-A direction view that Fig. 6 is slip oil drain valve shown in Fig. 5 of the present invention or slip eduction valve;
The B-B that Fig. 7 is slip oil drain valve shown in Fig. 5 of the present invention or slip eduction valve is to sectional view;
Nozzle head structural drawing Fig. 8 is for only having the first spray orifice to open shown in Fig. 1 of the present invention time;
Nozzle head structural drawing Fig. 9 is for only having the second spray orifice to open shown in Fig. 1 of the present invention time;
Figure 10 is nozzle head structural drawing when the first spray orifice shown in Fig. 1 of the present invention and the second spray orifice are all opened;
Embodiment
Below in conjunction with accompanying drawing citing, the present invention is described in more detail:
Composition graphs 1 ~ 10, technological scheme of the present invention: a kind of dual-fuel dual-piezoelectric control type injector peculiar to vessel, it is by the first piezoelectric pile control section 1, return opening 2, high pressure second liquid fuel inlet 3, tight cap 4, second piezoelectric pile control section 5, little needle-valve return spring 6, little needle-valve chamber 7, large needle valve pocket 8, spray orifice 9, nozzle 10, large needle-valve 11, little needle-valve 12, little noticeable degree piston 13, injector body 14, large needle-valve return spring 15, large needle-valve control piston 16, second liquid fuel relief port 17, high pressure fuel entrance 18 and the tight cap 19 of the first piezoelectric pile form.It is characterized in that: high pressure fuel entrance 18 is connected with high-pressure oil pipe, fuel oil handling equipment control room 23 is all connected with the high-pressure oil passage on injector body 14 with large needle valve pocket 8, return opening 2 is connected with low pressure fuel pipe, and oil leak hole 22 is connected with the oil return circuit on injector body 14; High pressure second liquid fuel inlet 3 is connected with high pressure second liquid fuel channel, second liquid fuel control chamber 32 and little needle-valve chamber 7 are all connected with the high pressure second liquid fuel flow channel on large needle-valve 11, high pressure second liquid fuel flow channel on large needle-valve 11 is connected with the second liquid fuel flow channel on injector body 14, second liquid fuel relief port 17 is connected with low pressure second liquid fuel channel, and the second liquid fuel discharge orifice 33 on large needle-valve 11 is connected with the second liquid fuel flow channel on injector body 14.First piezoelectric pile 27 is arranged on the upper end of injector body 14, fixed by the tight cap 19 of the first piezoelectric pile, slip oil drain valve 21 is compacted on the first piezoelectric pile 27 lower end surface by slip oil drain valve return spring 24, it is inner that second piezoelectric pile 35 is arranged on large needle-valve 11, and slip eduction valve 29 is compacted on the second piezoelectric pile 35 lower end surface by slip eduction valve return spring 31.First piezoelectric pile 27 making alive, due to the inverse piezoelectric effect of the first piezoelectric pile 27, first piezoelectric pile 27 anamorphic stretching, drive slip oil drain valve 21 slide downward, when the annular oil holding slot 26 on slip oil drain valve 21 is with oil leak hole 22 conducting, the high pressure fuel in fuel oil handling equipment control room 23 just flow in low pressure fuel pipe by oil leak hole 22, and large needle-valve 11 lifts, first spray orifice 36 is opened, and starts to spray into high pressure fuel in cylinder; After first piezoelectric pile 27 power-off, first piezoelectric pile 27 recovers original length, also home position is returned at the elastic force effect lower slider oil drain valve 21 of slip oil drain valve return spring 24, annular oil holding slot 26 disconnects with oil leak hole 22, large needle-valve 11 is taken a seat, first spray orifice 36 is closed, and stops the injection of high pressure fuel.Second piezoelectric pile 35 making alive, due to the inverse piezoelectric effect of the second piezoelectric pile 35, second piezoelectric pile 35 anamorphic stretching, drive slip eduction valve 29 slide downward, when the annular liquid holding groove 34 on slip eduction valve 29 is with discharge orifice 33 conducting of second liquid fuel, high pressure second liquid fuel in second liquid fuel control chamber 32 just flow in low pressure second liquid fuel conduit by second liquid fuel discharge orifice 33, little needle-valve 12 lifts, second spray orifice 37 is opened, and starts in cylinder, spray into second liquid fuel; After second piezoelectric pile 35 power-off, second piezoelectric pile 35 recovers original length, also home position is returned at the elastic force effect lower slider eduction valve 29 of slip eduction valve return spring 31, annular liquid holding groove 34 disconnects with second liquid fuel discharge orifice 33, little needle-valve 12 is taken a seat, second spray orifice 37 is closed, and stops the injection of second liquid fuel.
Fig. 1 is the overall structure schematic diagram of the present invention's dual-fuel dual-piezoelectric control type injector peculiar to vessel, comprises 1 first piezoelectric pile control section, 2 return openings, 3 high pressure second liquid fuel inlets, 4 tight caps, 5 second piezoelectric pile control sections, 6 little needle-valve return springs, 7 little needle-valve chambeies, 8 large needle valve pockets, 9 spray orifices, 10 nozzles, 11 large needle-valves, 12 little needle-valves, 13 little noticeable degree pistons, 14 injector bodies, 15 large needle-valve return springs, 16 large needle-valve control pistons, 17 second liquid fuel relief port, 18 high pressure fuel entrances and the tight cap of 19 first piezoelectric pile.
First piezoelectric pile electrical connector 20, slip oil drain valve 21, oil leak hole 22, fuel oil handling equipment control room 23, slip oil drain valve return spring 24, oil through 25, annular oil holding slot 26 and the first piezoelectric pile 27 together constitute the first piezoelectric pile control section 1 of dual-fuel dual-piezoelectric control type injector peculiar to vessel.ECU (Electrical Control Unit) controls elongation and the return of the first piezoelectric pile 27 by the first piezoelectric pile electrical connector 20, and then controls lifting and taking a seat of large needle-valve 11.First piezoelectric pile 27 is arranged on the top of injector body 14.Fuel oil handling equipment control room 23 and oil leak hole 22 are turned on or off according to the position of slip oil drain valve 21.The high pressure fuel being entered this injector body 14 oil circuit by high pressure fuel entrance 18 is also divided into two-way: a road enters fuel oil handling equipment control room 23; Another road flows in the large needle valve pocket 8 below this sparger.Oil leak hole 22 is connected with return opening 2, leads to low pressure fuel pipe.Slip oil drain valve 21 is compacted to the first piezoelectric pile 27 lower end surface under the effect of slip oil drain valve return spring 24, and have oil through 25 in the middle of slip oil drain valve 21, side has annular oil holding slot 26, and oil through 25 and annular oil holding slot 26 are inner conductings.Second piezoelectric pile electrical connector 28, slip eduction valve 29, through flow hole 30, slip eduction valve return spring 31, second liquid fuel control chamber 32, second liquid fuel discharge orifice 33, annular liquid holding groove 34 and the second piezoelectric pile 35 together constitute the second piezoelectric pile control section 5 of dual-fuel dual-piezoelectric control type injector peculiar to vessel.ECU (Electrical Control Unit) controls elongation and the return of the second piezoelectric pile 35 by the second piezoelectric pile electrical connector 28, and then controls lifting and taking a seat of little needle-valve 12.Second piezoelectric pile 35 is arranged on the inside of large needle-valve 11.Second liquid fuel control chamber 32 and second liquid fuel discharge orifice 33 are turned on or off according to the position of slip eduction valve 29.The second liquid fuel being entered this injector body 14 second liquid fuel flow path by high pressure second liquid fuel inlet 3 is also divided into two-way: the second liquid fuel flow path of a road on large needle-valve 11 enters second liquid fuel control chamber 32; The second liquid fuel flow path of another road on large needle-valve 11 flows in the little needle-valve chamber 7 below this sparger.Second liquid fuel discharge orifice 33 on large needle-valve 11 is connected with the second liquid fuel flow path on injector body 14.Slip eduction valve 29 is compacted to the second piezoelectric pile 35 lower end surface under the effect of slip eduction valve return spring 31, and have through flow hole 30 in the middle of slip eduction valve 29, side has annular liquid holding groove 34, and through flow hole 30 and annular liquid holding groove 34 are inner conductings.First spray orifice 36 and the second spray orifice 37 constitute the spray orifice 9 of dual-fuel dual-piezoelectric control type injector peculiar to vessel.Large needle-valve 11 lift and control first spray orifice 36 of taking a seat to combustion oil injection, lifting and the injection of control second spray orifice 37 pairs of second liquid fuel of taking a seat of little needle-valve 12.The mode that first spray orifice 36 adopts center line to parallel with the second spray orifice 37 is arranged.
Sparger, when dual fuel mode works, first can spray into the low fuel of point of ignition with the high fuel of the point of ignition sprayed after igniting.High pressure fuel enters sparger by high pressure fuel entrance 18, flow to fuel oil handling equipment control room 23 and large needle valve pocket 8 respectively, first piezoelectric pile 27 not making alive, slip oil drain valve 21 is in initial motionless position under the effect of slip oil drain valve return spring 24, annular oil holding slot 26 on slip oil drain valve 21 and oil leak hole 22 not conducting, drain path is closed, act on large needle-valve control piston 16 upper surface identical with the high pressure fuel pressure in large needle valve pocket 8, but the effective active area of upper surface is greater than lower tapered surface area, so now large needle-valve 11 is taken a seat, first spray orifice 36 is closed, not injected fuel, during the first piezoelectric pile 27 making alive, first piezoelectric pile 27 is due to the inverse piezoelectric effect anamorphic stretching of piezoelectric pile, promote slip oil drain valve 21 to move down, annular oil holding slot 26 now on slip oil drain valve 21 and oil leak hole 22 conducting, draining path is opened, high pressure fuel in fuel oil handling equipment control room 23 flows through oil leak hole 22 by oil through 25 and flows in low pressure fuel pipe, now large needle-valve 11 overcomes large needle-valve return spring 15 pretightening force and lifts under the effect of large needle valve pocket 8 inner high voltage fuel oil, first spray orifice 36 is opened, and sparger starts to in-cylinder injection high pressure fuel, when the first piezoelectric pile 27 power-off again, first piezoelectric pile 27 returns to initial length, slip oil drain valve 21 moves up under the elastic force effect of slip oil drain valve return spring 24, also return to initial position, annular oil holding slot 26 disconnects with the draining path of oil leak hole 22, and draining oil circuit is closed, fuel pressure in fuel oil handling equipment control room 23 raises again, large needle-valve 11 is taken a seat rapidly thereupon, and the first spray orifice 36 is closed again, and fuel oil sprays and terminates.High pressure second liquid fuel enters sparger by high pressure second liquid fuel inlet 3, flow in second liquid fuel control chamber 32 and little needle-valve chamber 7 respectively, second piezoelectric pile 35 not making alive time, second piezoelectric pile 35 keeps former length, second liquid fuel discharge orifice 33 not with the conducting of annular liquid holding groove 34, identical with the second liquid fuel pressure at little needle-valve 12 lower tapered surface place owing to acting on little noticeable degree piston 13 upper surface, but the effective active area of upper surface is greater than lower tapered surface area, so now little needle-valve 12 is taken a seat, second spray orifice 37 is closed, do not spray second liquid fuel, after giving the second piezoelectric pile 35 making alive, second piezoelectric pile 35 to deform elongation due to the inverse piezoelectric effect of piezoelectric crystal, downward promotion slip eduction valve 29, annular liquid holding groove 34 on slip eduction valve 29 and second liquid fuel discharge orifice 33 conducting moment, high pressure second liquid fuel in second liquid fuel control chamber 32 flows back in low pressure pipeline by the second liquid fuel flow channel on injector body 14 by second liquid fuel relief port 17, high pressure second liquid fuel pressure in second liquid fuel control chamber 32 declines, little needle-valve 12 overcomes little needle-valve return spring 6 pretightening force and is lifted under the effect of little needle-valve chamber 7 inner high voltage second liquid fuel, second spray orifice 37 is opened, start to spray second liquid fuel, when voltage in disconnection second piezoelectric pile 35, second piezoelectric pile 35 recovers former length, slip eduction valve 29 also returns back to initial position under the elastic force effect of slip eduction valve return spring 31, second liquid fuel discharge orifice 33 and annular liquid holding groove 34 are disconnected, current by pass disconnects, and the second liquid fuel pressure in second liquid fuel control chamber 32 raises again, and little needle-valve 12 is taken a seat, second spray orifice 37 is closed, and second liquid fuel sprays and terminates.When the first piezoelectric pile 27 and the second piezoelectric pile 35 are respectively according to when just can realize two kinds of liquid fuels poor or spray simultaneously when the energising of set time or power-off.Sparger is when any single-fuel work pattern, as long as ensure that the first piezoelectric pile 27 or the second piezoelectric pile 35 have and only have one to be energized, mode of operation is now the same with existing piezo injector, control lifting and taking a seat of large needle-valve 12 or little needle-valve 13 by the piezoelectric pile be energized, thus control the injection of spray orifice 9 pairs of fuel.
Claims (2)
1. dual-fuel dual-piezoelectric control type injector, it is characterized in that: comprise injector body and be arranged on the first piezoelectric pile control section in injector body, second piezoelectric pile control section, large needle-valve injection apparatus, little needle-valve injection apparatus, first piezoelectric pile control section and little needle-valve injection apparatus are arranged in large needle-valve injection apparatus, second piezoelectric pile control section is arranged in little needle-valve injection apparatus, large needle-valve injection apparatus comprises the large needle-valve be connected successively, large needle-valve return spring, large needle-valve control piston, little needle-valve injection apparatus comprises the little needle-valve be connected successively, little needle-valve return spring, little noticeable degree piston, large needle valve pocket is formed between large needle-valve and injector body, little needle-valve chamber is formed between little needle-valve and large needle-valve, fuel oil handling equipment control room is formed between large needle-valve control piston and the first piezoelectric pile control section, second liquid fuel control chamber is formed between little noticeable degree piston and the second piezoelectric pile control section, injector body offers high pressure fuel passage, high pressure second liquid fuel channel, drainback passage, second liquid fuel current by pass, high pressure fuel passage is communicated with high pressure fuel entrance respectively, fuel oil handling equipment control room, large needle valve pocket, high pressure second liquid fuel channel is communicated with second liquid fuel control chamber respectively, little needle-valve chamber, drainback passage is communicated with return opening and connects the first piezoelectric pile control section, second liquid fuel current by pass is communicated with second liquid fuel relief port and connects the second piezoelectric pile control section,
The first described piezoelectric pile control section comprises the first piezoelectric pile, first slip oil drain valve, first slip oil drain valve return spring, first slip oil drain valve is depressed into the first piezoelectric pile lower end surface under the effect of the first slip oil drain valve return spring, the first through flow hole is had in the middle of first slip oil drain valve, side has first ring shape liquid holding groove, first through flow hole and the inner conducting of the first annular liquid holding groove, fuel oil handling equipment control room is communicated with the first through flow hole, the backward lower promotion first of first piezoelectric pile energising is slided oil drain valve, the first annular oil holding slot on first slip oil drain valve and the first oil leak hole conducting, high pressure fuel in fuel oil handling equipment control room flow to drainback passage by the oil leak hole on injector body, when after the first piezoelectric pile power-off, first annular liquid holding groove and discharge orifice disconnect,
The second described piezoelectric pile control section comprises the second piezoelectric pile, second slip oil drain valve, second slip oil drain valve return spring, second slip oil drain valve is depressed into the second piezoelectric pile lower end surface under the effect of the second slip oil drain valve return spring, the second through flow hole is had in the middle of second slip oil drain valve, side has the second annular liquid holding groove, second through flow hole and the inner conducting of the second annular liquid holding groove, second liquid fuel control chamber is communicated with the second through flow hole, the backward lower promotion second of second piezoelectric pile energising is slided oil drain valve, the second annular oil holding slot on second slip oil drain valve and the second oil leak hole conducting, high pressure fuel in second liquid fuel control chamber flow to second liquid fuel current by pass by the second liquid fuel discharge orifice on the large needle-valve injection apparatus of spray, when after the second piezoelectric pile power-off, second annular liquid holding groove and second liquid fuel discharge orifice disconnect.
2. dual-fuel dual-piezoelectric control type injector according to claim 1, is characterized in that: the end of large needle-valve and little needle-valve arranges the first spray orifice and the second spray orifice respectively, and the mode that the first spray orifice adopts center line to parallel with the second spray orifice is arranged.
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| CN201310155719.8A CN103244321B (en) | 2013-04-28 | 2013-04-28 | Dual-fuel dual-piezoelectric control type injector |
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| CN201310155719.8A CN103244321B (en) | 2013-04-28 | 2013-04-28 | Dual-fuel dual-piezoelectric control type injector |
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| CN103244321A CN103244321A (en) | 2013-08-14 |
| CN103244321B true CN103244321B (en) | 2015-03-11 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351115B (en) * | 2015-11-27 | 2019-04-23 | 哈尔滨工程大学 | No leakage voltage control standard fuel gas ejecting device |
| CN105422345B (en) * | 2015-12-11 | 2017-09-15 | 中国北方发动机研究所(天津) | A kind of dual fuel injector device |
| CN105756821B (en) * | 2016-04-21 | 2018-05-18 | 哈尔滨工程大学 | The double piezoelectricity hybrid fuel jet devices of the non pressurized fuel oil-pressurized combustion gases of combined type |
| CN114687901A (en) * | 2020-12-25 | 2022-07-01 | Bmdi (新加坡)私人有限公司 | Dual-fuel injector for engine |
| CN114165375A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Fuel injector and fuel injection method |
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| GB2094940A (en) * | 1981-02-18 | 1982-09-22 | Nissan Motor | Piezo-electric valve |
| DE19950760A1 (en) * | 1999-10-21 | 2001-04-26 | Bosch Gmbh Robert | Fuel injection valve esp. for fuel injection systems of IC engines with piezo-electric or magneto-strictive actuator and valve closing body operable by valve needle working with valve |
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