EP0828936A1 - Injection valve - Google Patents

Injection valve

Info

Publication number
EP0828936A1
EP0828936A1 EP19960914853 EP96914853A EP0828936A1 EP 0828936 A1 EP0828936 A1 EP 0828936A1 EP 19960914853 EP19960914853 EP 19960914853 EP 96914853 A EP96914853 A EP 96914853A EP 0828936 A1 EP0828936 A1 EP 0828936A1
Authority
EP
European Patent Office
Prior art keywords
piston
nozzle needle
injection valve
control
injection
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
Application number
EP19960914853
Other languages
German (de)
French (fr)
Other versions
EP0828936B1 (en
Inventor
Wendelin KLÜGL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19519191 priority Critical
Priority to DE1995119191 priority patent/DE19519191C2/en
Application filed by Siemens AG filed Critical Siemens AG
Priority to PCT/DE1996/000818 priority patent/WO1996037698A1/en
Publication of EP0828936A1 publication Critical patent/EP0828936A1/en
Application granted granted Critical
Publication of EP0828936B1 publication Critical patent/EP0828936B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/06Other fuel injectors peculiar thereto
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603Injectors peculiar thereto with means directly operating the valve needle using piezo-electric or magnetostrictive operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Abstract

An injection valve with a needle nozzle (2) fitted in a valve housing (1), a fuel feed and a piezoelectric, hydraulically converted control device is designed to permit fast valve actuation in such a way that the needle nozzle (2) can be directly controlled via a pushrod (7) by a secondary piston (14) which can be operated by the primary piston (19) of the piezoelectric control device. This invention is applicable to diesel fuel injection systems.

Description

description

Injector

The invention relates to an injection valve according to the preamble of claim 1.

Such an injection valve is known for example from EP-A 0 531 533. This publication deals with a diesel injection device with a high-pressure system (common rail system), in which the fuel is supplied to a high-pressure accumulator via a high-pressure pump. This fuel, which is under high pressure, is then fed to the individual cylinders of a diesel engine via injection valves in accordance with a control. The injection valves are each controlled by a solenoid valve, for example to enable individual injection times.

In order to obtain in particular injection valves with which a pre-injection is also possible in order to improve consumption, exhaust gas values, noise, etc., the injection valves should be able to be switched quickly at high injection pressures. At high accumulator pressures, a pre-injection is difficult to use when using a solenoid valve, since the switching times of the solenoid valve are too long and the valve has to go through the full stroke in order to achieve reproducible conditions, for example the injection quantity. In addition, the shaping of the injection rate, i.e. Slow opening, but fastest closing of the nozzle needle, whereby the injection rate can be shaped according to a map, hardly possible.

It is an object of the present invention to provide an injection valve which can be switched extremely quickly. This object is solved by claim 1. Advantageous further developments are characterized in the subordinate claims.

Since the nozzle needle is actuated practically directly by the piezo actuator, the nozzle needle is actuated as quickly as possible.

The invention is explained in more detail below with the aid of an illustration.

The illustration shows an injection valve in section.

The injection valve shown in the figure consists of an elongated housing 5, on the lower end of which a union nut 3 is screwed on. With this cap nut 3, an intermediate washer 4 and a nozzle body 1, in which a nozzle needle 2 is guided, are held from the lower end of the housing 5. The intermediate disk 4 and the nozzle body 1 have a central bore in which the nozzle needle 2 is guided so as to be displaceable in the axial direction. In the housing 5, a stepped plunger 7 is guided in the axial direction, which rests against the nozzle needle 2 at one end and is connected at the other end to a secondary piston 14 of the piezoelectric drive device. In the area of the gradation of the tappet 7, a first pressure chamber 8 is provided, which is connected to a fuel inlet connection 10 via an inlet bore 9. This high-pressure inlet connection 10 is also connected via an inlet bore 6 to a second pressure chamber 11, in the area of which the nozzle needle 2 is stepped, whereby a control surface for controlling the nozzle needle 2 is formed.

As described above, the tappet 7 is connected to a secondary piston 14 which is guided in a primary piston. A piezo actuator 20 acts on the primary piston, which is mounted in a closure 21 and is opposite the actuator. door housing 12 is sealed by an O-ring 22. The closure 21 is secured in the axial direction by means of a securing ring 24. Electrical connections 23 lead to the actuator 20.

The piezo actuator 20 acts via the primary piston 19 on a plate spring 13. Furthermore, a spring 15 is provided in the recess of the secondary piston, which presses on an inner surface of the primary piston 19.

The injection valve also has a plurality of bores or spaces which are under low pressure. There is a space 16 in the area between the plunger 7 and one end of the nozzle needle 2. This space 16 is connected to a return 25 via a leakage bore 27 and 29. The piezo actuator 20 is arranged in a leakage space 26, which also opens into the return. This space 26 is further connected via a relief bore 18 to a space 17 in which the spring 15 is arranged. The working space 28 in the area of the plate spring 13 is always filled with fuel, which penetrates into this space due to the play between the upper area of the tappet 7 and the housing 5.

When the nozzle is closed, the effective areas for the pressure are designed so that the ring area on the plunger 7 is somewhat smaller than the ring area on the pressure shoulder of the nozzle needle 2. Therefore, even when the nozzle needle 2 is closed, there is always a resulting pressure force which acts upwards. but it is such that it is exceeded by the spring force of the spring 15, whereby the nozzle needle 2 is pressed securely onto its seat. No injection takes place in this position. However, the effective diameters of the plunger 7 and the nozzle needle 2 mentioned are designed so that the spring 15 can be designed for acceptable, small forces. However, the spring force must be so great that the nozzle needle 2 can be pressed onto the seat quickly enough at the end of the injection. It should be borne in mind that it acts upwards during the injection of the nozzle seat area. A quick closing process of the nozzle needle has a favorable effect on the exhaust gas values of the internal combustion engine.

A piezo actuator offers the possibility of realizing faster switching operations than an electromagnet. However, the small paths that a piezo actuator makes and therefore have to be translated are problematic.

The way the piezo actuator works on the injector is as follows:

The tappet 7 to the housing 5 and the secondary piston 14 to the primary piston 19 and the primary piston 19 to the actuator housing 12 are paired with one another with fits. However, the fits only represent a gap seal, so that a small amount of fuel can constantly leak from the inlet 10 through the pressure chamber 8 along the tappet 7. One L-corner portion goes in the direction of the nozzle needle 2 and must be fed to the return via the leakage holes 29 and 27. The other leakage part enters the working space 28 and keeps it filled. Leakage fuel with excess flow flows along the secondary piston 14 via the relief bore 18 into the leakage space 26 and from there to the return 25. The working space 28 is thus always full of fuel. The

Disc spring 13 presses primary piston 19 with a defined preload against piezo actuator 20 into the starting position without play. In the starting position (rest position), the plunger 7 is pressed down by the spring 15 via the secondary piston 14 (no injection in this state). When the piezo actuator 20 is energized, it expands downward and also moves the primary piston 19 downward against the force of the telescopic spring 13. The volume of liquid in the working space 28 is displaced and guides the secondary piston 14 with the plunger upwards, as a result of which the nozzle needle 2 is moved upwards due to the resulting pressure force. The start of injection is hereby triggered. This construction of the piezo actuator with the two pistons ensures that the plunger 7 and thus the nozzle needle 2 are always moved from a defined starting position. For the movement of the nozzle needle 2, only the dynamics of the secondary piston 14 with the tappet 7 are decisive and not the dynamics of a hydraulic system as in known systems with valves. All thermal expansions are compensated. The workspace is always full. The piezo actuator is practically always under the same preload.

The return 25 is relieved to low pressure. Piezo stacks are preferred as the piezo actuator, which also facilitate operation with relatively low voltages in the vehicle.

Claims

claims
1. Injector for fuel injection systems, with:
- A nozzle needle (2) arranged in a valve housing (1), which can open and close at least one injection opening of the injection valve, '
- A fuel feed (10), which is hydraulically connected via a pressure chamber (8, 16) with two differently sized control surfaces of the nozzle needle (2) and a tappet (7) driving the nozzle needle (29), a piezoelectric control device which is hydraulically over a primary and secondary piston (14,19) and controls the nozzle needle (2), characterized in that - the nozzle needle (2) via the plunger (7) through the secondary piston (14) directly is controllable, which can be driven by the primary piston (19) of the piezo control device.
2. Injection valve according to claim 1, characterized in that the secondary piston (14) is fixedly connected to the tappet (7) and is biased over the primary piston (19) via a spring (15).
3. Injection valve according to claim 1 and 2, characterized in that the spring (15) the secondary piston
(14) in the direction of the nozzle needle (2).
4. Injection valve according to claim 1, characterized in that the control surfaces are formed by annular surfaces and the one annular surface of the tappet (7) is somewhat smaller than the other annular surface on the pressure shoulder of the nozzle needle (2). so that a resulting force always remains in the direction of the drive device.
5. Injector according to claim 4, characterized gekenn¬ characterized in that the resulting force is less than that Force of the spring (15) so that the nozzle needle (2) is pressed onto its seat when the control device is inactive.
6. Injection valve according to claim 1, characterized in that the working chamber (28) formed between primary piston (19) and secondary piston (14) is always filled via a leakage flow of the injection valve.
7. Injection valve according to claim 6, characterized in that gaps are provided between the plunger (7) and the housing (5) and between the primary piston (19) and secondary piston (14) and between the primary piston (19) and housing (12), which are designed in such a way that there is little leakage between them, so that the working space (28) is always filled with liquid, and that
Thermal expansion of the piezo actuator has a play-balanced, pre-stressed and clearly defined initial position before switching on an electrical voltage.
EP96914853A 1995-05-24 1996-05-11 Injection valve Expired - Lifetime EP0828936B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19519191 1995-05-24
DE1995119191 DE19519191C2 (en) 1995-05-24 1995-05-24 Injector
PCT/DE1996/000818 WO1996037698A1 (en) 1995-05-24 1996-05-11 Injection valve

Publications (2)

Publication Number Publication Date
EP0828936A1 true EP0828936A1 (en) 1998-03-18
EP0828936B1 EP0828936B1 (en) 2000-03-22

Family

ID=7762838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914853A Expired - Lifetime EP0828936B1 (en) 1995-05-24 1996-05-11 Injection valve

Country Status (4)

Country Link
EP (1) EP0828936B1 (en)
DE (1) DE19519191C2 (en)
ES (1) ES2145446T3 (en)
WO (1) WO1996037698A1 (en)

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US5979803A (en) * 1997-05-09 1999-11-09 Cummins Engine Company Fuel injector with pressure balanced needle valve
US5884848A (en) * 1997-05-09 1999-03-23 Cummins Engine Company, Inc. Fuel injector with piezoelectric and hydraulically actuated needle valve
DE19726125C2 (en) * 1997-06-20 1999-04-15 Telefunken Microelectron Fuel injection method
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DE19956830C2 (en) * 1999-11-25 2002-07-18 Siemens Ag execution
DE10007735A1 (en) * 2000-02-19 2001-09-06 Daimler Chrysler Ag Fuel injection valve for IC engines has pressure-reducing throttle between high-pressure fuel in fuel chamber/line and lower pressure fuel in valve needle actuator area
DE10029629A1 (en) * 2000-06-15 2002-01-03 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE10042231B4 (en) * 2000-08-28 2004-09-30 Siemens Ag Injection valve for injecting fuel into an internal combustion engine and method for controlling the opening and closing process of a nozzle needle of an injection valve
DE10133265A1 (en) 2001-07-09 2003-01-23 Bosch Gmbh Robert Fuel injection valve with piezoelectric or magnetostrictive actuator, has hydraulic coupling valve closure body and seat surface urged pressed together by spring
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WO2005026531A1 (en) * 2003-09-10 2005-03-24 Siemens Aktiengesellschaft Injection valve for injecting fuel into an internal combustion engine
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DE102005009148A1 (en) 2005-03-01 2006-09-07 Robert Bosch Gmbh Fuel injector with direct-acting injection valve member with double seat
DE102005015731A1 (en) * 2005-04-06 2006-10-12 Robert Bosch Gmbh Fuel injector with piezo actuator
DE102005016796A1 (en) * 2005-04-12 2006-10-19 Robert Bosch Gmbh Two-stage fuel injector
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DE102005036444A1 (en) * 2005-08-03 2007-02-08 Robert Bosch Gmbh injection
DE102005054739B4 (en) * 2005-11-17 2017-06-08 Robert Bosch Gmbh Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezoactuator-controlled common rail injector
DE102006019308A1 (en) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Injector for fuel supply to internal combustion engine, especially in motor vehicle, has piezoactuator with foot on end remote from nozzle needle with sealing profile facing needle that contacts seal seat on injector body
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Also Published As

Publication number Publication date
WO1996037698A1 (en) 1996-11-28
DE19519191C2 (en) 1997-04-10
EP0828936B1 (en) 2000-03-22
ES2145446T3 (en) 2000-07-01
DE19519191A1 (en) 1996-12-19

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