EP1252436B1 - Injection device and method for injecting a fluid - Google Patents

Injection device and method for injecting a fluid Download PDF

Info

Publication number
EP1252436B1
EP1252436B1 EP01911336A EP01911336A EP1252436B1 EP 1252436 B1 EP1252436 B1 EP 1252436B1 EP 01911336 A EP01911336 A EP 01911336A EP 01911336 A EP01911336 A EP 01911336A EP 1252436 B1 EP1252436 B1 EP 1252436B1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
injection
space
way 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.)
Expired - Lifetime
Application number
EP01911336A
Other languages
German (de)
French (fr)
Other versions
EP1252436A2 (en
Inventor
Bernd Mahr
Martin Kropp
Hans-Christoph Magel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 claimed from DE10008268A external-priority patent/DE10008268A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1252436A2 publication Critical patent/EP1252436A2/en
Application granted granted Critical
Publication of EP1252436B1 publication Critical patent/EP1252436B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M47/027—Electrically 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • 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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0061—Single actuator acting on two or more valve bodies
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
    • 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

Definitions

  • the invention relates to an injection device and a method for injecting fluid according to the preamble of the independent claims.
  • An apparatus and a method for injecting fuel are known, for example, from EP 0 562 046 B1.
  • the basic requirement of such a system is to carry out the fuel injection with the largest possible injection pressure.
  • a high injection pressure has positive effects on the function of a motor; For example, pollutant emissions and fuel consumption are reduced.
  • a pressure booster is provided, which converts a primary, provided by a pressure accumulator available pressure in the desired high injection pressure by a hydraulic transmission. By suitable choice of the acted upon surfaces and the counter forces of elastic means a suitable pressure gain can be adjusted.
  • control of pressure booster and injector can be done so that two 2/2-valves are provided, which are each controlled by two separate control elements.
  • For each control element is to provide a separate control electronics.
  • tuning of the control electronics switching sequences can be achieved with which different injection processes can be realized.
  • the described apparatus solution is expensive.
  • a pressure boost is particularly useful in conjunction with a common rail system.
  • common-rail accumulator injection primary pressure generation and injection are decoupled.
  • the injection pressure is generated independently of the engine speed and the injection quantity and in the "rail" (Fuel storage) provided for the injection.
  • a favorable course of injection can be realized in this way, since in particular injection pressure and injection quantity can be determined independently of one another for each operating point of the engine.
  • the pressure in the common rail is currently limited to about 1600 bar, so that an increase in pressure is desired for emission reasons and reasons of fuel consumption.
  • pressure amplifiers with a gear ratio of 1: 7 are known.
  • a pressure intensifier in combination with a common rail system could thus provide particularly good results.
  • the injection device according to the invention and the method according to the invention have the advantage that different injection rates for the injections can be achieved with a single control element via two 2/2 valves, which is particularly useful in connection with the use of the invention in a common rail system ,
  • valves can be actuated by a suitable setting of hydraulic pressure surfaces and elastic means at different times or at different activation states (partial lift / full lift)
  • US-5 143 291 shows an injector with a solenoid actuated pilot valve which operates a poppet valve and a drain valve.
  • a pressure intensifier for boosting the primary pressure is provided.
  • EP-A-0 829 640 A2 shows an injector having a first solenoid and a second solenoid for actuating one valve each.
  • this document also discloses a pressure booster.
  • the hydraulic coupling space can also be a force-displacement ratio and the compensation of tolerances, e.g. Serve position changes.
  • the primary pressure is provided by a common rail. It is thus possible to combine the advantages of a common-rail system with the pressure-enhanced injection device.
  • the common rail pressure which is currently limited to about 1600 bar, can be pressure-boosted; thus emissions and fuel consumption are reduced.
  • the injection system is stroke-controlled. There is thus a control room, via whose discharge the injection nozzle can be opened. In this way, it is possible, at a comparatively low pressure in the feed region of the injection nozzle, nevertheless to open the injection nozzle and thus carry out an injection - for example a pilot injection - at low pressure, for example at rail pressure.
  • the first 2/2 valve closes a control room for a lift control, and the first 2/2 valve opens the control room for the lift control in a second state.
  • An actuation of the first 2/2 valve is thus sufficient to cause an injection.
  • the second 2/2 valve In a first state, the second 2/2 valve preferably separates a rear space of the pressure intensifier from a return system, and the second 2/2 valve, in a second state, couples the rear space of the pressure intensifier to the return system.
  • the back space thus represents a control chamber for the pressure booster.
  • the first 2/2-way valve and the second 2/2-valve are coordinated so that by partially actuating the control element first, the first 2/2-valve can be converted from its first state to its second state and then the second 2/2-valve can be converted from its first state to its second state by further actuation of the actuating element.
  • the lift control effected by the first 2/2 valve can be used for a low rail pressure pilot injection while the operation of the first valve is used with subsequent operation of the second 2/2 valve for a main high pressure injection. It is thus a separate control of the injector (stroke control) and the pressure build-up by the pressure booster possible. This allows a diverse shaping of the injection pressure curve.
  • a control chamber for the stroke control via a first throttle with the first 2/2-valve is connected, and the control chamber for the stroke control is connected via a second throttle to the feed region of the injection nozzle. Due to the flow difference of these throttles, the opening speed of the nozzle needle can be determined in the stroke-controlled injection.
  • a working pressure chamber of the pressure booster is connected to a high-pressure chamber of the pressure booster via a check valve, via which the high-pressure chamber can be filled.
  • a check valve prevents the high pressure from the high-pressure chamber of the pressure intensifier enters the working pressure chamber of the pressure intensifier;
  • the check valve allows the filling of the high-pressure chamber from the working pressure chamber.
  • a choke connected in series with it is provided.
  • a working pressure chamber of the pressure booster is connected via a check valve to a rear space of the pressure booster, via which the rear space can be relieved.
  • the pressure intensifier piston assumes its maximum lift at a pressure difference between the working pressure chamber and the high-pressure chamber and closes the connecting line to the injector in this position. In this way, the corresponding injector is switched off in case of damage.
  • a rear space of the pressure intensifier can be filled from the working pressure chamber. This can be done for example via a throttle. A sudden increase in the pressure in the back space is not allowed due to the throttle. However, it is possible to fill the rear space via the throttle, so that the pressure booster is ready for the next injection process.
  • the adjusting element is arranged between the pressure booster and the valve device.
  • the first 2/2-valve can move into the vicinity of the injection nozzle, which avoids an unnecessary increase of the control chamber.
  • the actuator is located between the first 2/2 valve and the second 2/2 valve.
  • the actuator may be arranged so that its movement is perpendicular to the longitudinal extent of the injector. This also has advantages in the With regard to the minimization of the volumes of the control space of the stroke control and also the pressure booster.
  • the adjusting element is arranged above the valve device and pressure booster. This variant offers the possibility of a very compact design.
  • the actuator is a piezoelectric actuator.
  • Piezo actuators have proven to be electronically controllable positioning elements, in particular because they are compact in construction and work reliably.
  • the control function can be changed by changing the parameters (voltage, pulse duration) of the control.
  • the actuator and the valve means are realized by a solenoid valve with two valve bodies, wherein a first valve body with a valve seat and a second valve body with a valve seat are arranged coaxially with each other.
  • a connecting member which is located within the second valve body, with the actuating element.
  • the guide of the first valve body is located outside of the second valve body.
  • first 2/2 valve and the second 2/2 valve are actuated by a common hydraulic coupling space of the actuator. It is therefore also at this point a reduced expenditure on equipment to record; the inventive method can be easily designed.
  • the actuation of the first 2/2-valve is used for pre-injection. It can thus be made with low pressure and low injection quantity injection.
  • a first valve is opened by partial actuation of the actuating element, wherein a pre-injection begins at low pressure, and then closed by resetting the actuating element, the first valve, so that the injection is terminated.
  • the inventive method is particularly advantageous in that a control chamber is relieved by partial actuation of the actuating element, so that the injection nozzle opens and an injection phase at low pressure, then by further actuation of the actuator a rear space of the pressure booster with a return system by opening the second 2nd / 2-valve is connected, then an increase in pressure of the injection pressure by the pressure booster takes place, so that now takes place an injection phase at high pressure and then close by resetting the actuator, the first 2/2-valve and the second 2/2-valve, so that the injection is finished. It is thus possible to provide a favorable sequence of pre-injection and main injection as well as a "boot" -shaped main injection by communicating with a single actuator via preferably a single coupling space with two 2/2 valves.
  • a stroke-controlled pre-injection is combined with the advantages of an increasing pressure curve in the main injection. It may also be useful that by operating the actuator a back space of the pressure intensifier is connected to a return system by opening the second 2/2-valve and a pressure gain through the pressure booster and that by further actuation of the actuating element, a control chamber is relieved, so that the injection nozzle opens and an injection phase is present at high pressure.
  • a post-injection can be carried out at a high pressure level in an advantageous manner: by switching back from the second switching position to the first switching position only the injector is closed, the pressure intensifier remains active. Re-switching to the second switching position then opens the injector for a post-injection at high pressure.
  • the high-pressure chamber of the pressure booster is filled via a check valve, via which it is connected to the working pressure chamber. Since a sufficient fluid reservoir is present in the working pressure chamber, it is useful to use this for filling the high-pressure chamber via a check valve. Conversely, can not pass through the check valve, the high pressure from the high-pressure chamber in the working pressure chamber of the pressure booster; the pressure is fully used to control the injector.
  • a rear space of the pressure intensifier is filled from the working pressure chamber of the pressure intensifier.
  • This can be done for example via a throttle.
  • the throttle thus allows a filling and thus a provision of the pressure booster for the next injection process; but it avoids an undesirable transfer of a rapid change in pressure from the working pressure chamber of the pressure booster in the rear space.
  • the method is particularly advantageous if an injection profile is formed by the time profile of the control of the actuating element and / or by the interpretation of the valve switching forces.
  • the system thus offers numerous possibilities of variation, which can be permanently installed both by the design of the components or can also be changed by the control of the control element in the process.
  • the invention is particularly characterized in that by using two 2/2-valves, which are actuated by a common actuator via a common coupling space, an injector with pressure booster can be controlled in a reliable manner. It is therefore no longer necessary to provide separate electronic and hydraulic controls for pressure booster and injector. This results in an advantageous reduction of the expenditure on equipment.
  • the advantages of a stroke-controlled pilot injection can be advantageously combined with the advantages of an increasing pressure curve in the main injection.
  • FIG. 1 shows a first embodiment of an injection device 10 according to the invention.
  • An injection nozzle 12 serves to inject fuel into the combustion chamber of an engine, in particular a diesel engine.
  • the injector 12 is provided with fuel from a pressure booster 16 fuel.
  • the injection nozzle 12 is driven by a first 2/2-valve 18.
  • the pressure booster 16 is controlled by a second 2/2 valve 20.
  • Both 2/2 valves 18, 20 are operated by a piezoelectric actuator 22 via a common hydraulic coupling chamber 24.
  • a pressure builds up in a control chamber 44, which normally corresponds to the pressure of a pressure accumulator (common rail) 26; this provides the primary pressure for the injector 10.
  • the pressure in the control chamber 44 exerts a closing force on the injection nozzle 12, whereby the injection nozzle is closed.
  • the second 2/2-valve 20 closes in the closed state, a connection between the return system 34 of the injector and a rear chamber 46 of the pressure booster 16. Opens the second 2/2-valve 20, so there is a relief of the back space 46 and thus a pressure gain by the pressure amplifier 16.
  • the working pressure chamber 32 and the high-pressure chamber 36 of the pressure booster 16 are connected via a check valve 38 and a throttle 56 with each other.
  • the high-pressure chamber 36 can be via the check valve 38 from the working pressure chamber 32 in preparation for the next pressure boost refill while the throttle 56 prevents the filling path acts as a bypass during an injection.
  • a further check valve 48 is provided, via which the working pressure chamber 32 is connected to the rear space 46 of the pressure booster 16.
  • the check valve 48 prevents the formation of an overpressure in the rear space 46 of the pressure booster.
  • a parallel to the check valve 48 connected throttle 50 allows the refilling of the back space 46, but avoids an undesirable sudden pressure transfer between working pressure chamber 32 and rear space 46.
  • To determine the opening speed of the nozzle needle of the injector 12 are two more throttles 52, 54 as inlet throttle 52 and Outflow throttle 54 of the control chamber 44 is provided. It should be noted that, in particular, the check valve 48 and the throttle 56, although in view of the intrinsic safety of the system bring significant benefits, but in principle must not be critical to the functioning of the system.
  • the operation of the injector 10 may for example be such that the piezoelectric actuator 22 is first activated in a manner that only a small stroke (partial stroke) takes place. This stroke is chosen so that the first 2/2-way valve 18 opens, the second 2/2-valve 20, however, still remains closed.
  • the control chamber 44 is relieved via the throttle 54, and there is a stroke-controlled opening of the injector 12.
  • the pressure of the common rail 26 is normally above the working pressure chamber 32 of the pressure booster 16, the throttle 56 and the check valve 38 to the injector 12 at. There is an injection with low injection pressure.
  • the high-pressure chamber 36 of the pressure booster 16 is filled via the throttle 56 and the check valve 38 from the working pressure chamber 32 of the pressure booster 16.
  • the control of the first 2/2-valve 18 with a small stroke of the piezoelectric actuator 22 can thus be used in a favorable manner for pre-injection at low pressure.
  • the piezoelectric actuator 22 is arranged laterally on the injection device 10. In this way, a 180 ° arrangement can be selected for the first 2/2-way valve 18 and the second 2/2-way valve 20. Such an arrangement has advantages in terms of minimizing the volumes of the effective control space for the stroke control and the pressure booster 16. Components corresponding to those in Figure 1 are identified by the same reference numerals.
  • FIG. 3 shows a further arrangement of the components of the injection device.
  • the piezoelectric actuator 22 is disposed over the pressure amplifier 16, resulting in a very compact design.
  • components are those in Figures 1 and 2, identified by the same reference numerals.
  • FIG. 4 shows a hydraulic circuit diagram.
  • To generate the system pressure z. B. uses a volume-controlled high-pressure pump.
  • the fuel is compressed to a controllable first system pressure of about 300 bar to about 1500 bar and stored in a pressure accumulator (common rail) 26.
  • the injection is controlled by needle lift control via the valve 18, which is schematically represented by its various switching states.
  • a pressure booster 16 located between the common rail 26 and the injector 14, a pressure booster 16 to increase the injection pressure.
  • the pressure amplifier 16 is driven by a 2/2-valve 20, which is also shown schematically by its various switching states.
  • For refilling the high-pressure chamber 36 of the pressure intensifier 16 is a bypass with a check valve 38 is available.
  • injections with different pressures can take place with the illustrated arrangement. If the valve 20 is closed, the entire injector 14 is under rail pressure; the pressure amplifier 16 is in its starting position. By the control (stroke control) of the injector 12 with the valve 18, an injection with rail pressure can be carried out as in a common rail system of the prior art. If an injection with increased injection pressure, so the valve 20 is driven. Thus, the pressure booster 16 is operated.
  • valves 18, 20 are driven by the same actuator 22.
  • the actuator 22 has three positions - a rest position and two switching positions. The taking of the different Positions is achieved by varying the control of the actuator 22.
  • (b) can be carried out at a high pressure level in an advantageous manner: by switching back from the second switching position (S2) in the first switching position (S1), only the injector 12 is closed, the pressure amplifier 16 remains active. Reverting to the second shift position (S2) then opens the injector 12 for a post-injection at high pressure.
  • FIG. 5 shows an embodiment of the invention.
  • actuator 22 a three-stage magnetic actuator is provided.
  • the valves 18, 20 are arranged coaxially.
  • the first switching position which is taken by the control with a low switching voltage
  • only the small stroke (h1) is passed through until the first valve body 60 abuts against a second valve body 62. It moves only the first valve body 60, so that a flow occurs at the valve seat 64 of the valve 18.
  • the second valve body 62 remains in its valve seat 66, so that the valve 20 remains in the closed state.
  • the springs 68, 70 of the actuator 22 counteract, and there is a reduced spring force.
  • This low effective spring force, the low moving mass (it moves only the first valve body 60) and the small stroke allows a short switching time. This is particularly advantageous for a pilot injection.
  • the second switching position is occupied by the actuator 22 is driven with a higher control voltage.
  • the stroke (h2) is passed through, and the valve seat 66 of the valve 20 also switches to flow.
  • the guide 80 of the first valve body 60 is located outside of the second valve body 62.
  • valve piston 60 relative to the valve body 62 may have a certain amount of play. This allows a two-part and thus simpler manufacturing of the valves 18, 20 performing double valve.

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)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Fluid-Driven Valves (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention relates to an injection device with an injector (12), a pressure intensifier (16) for intensifying a primary pressure, a valve device (18, 20) for actuating the pressure intensifier (16), and an actuating element (22) for actuating the valve device (18, 20), wherein the valve device has at least one first 2/2-port directional-control valve (18) and one second 2/2-port directional-control valve (20), which can be actuated by the actuating element (22). The invention also relates to a method for injecting fluid, in which an actuating element (22) is activated, the actuating element (22) actuates a valve device (18, 20), the valve device (18, 20) actuates a pressure intensifier (16) for intensifying a primary pressure, and an injector (12) is opened, wherein the actuating element (22) actuates a first 2/2-port directional-control valve (18) and a second 2/2-port directional-control valve (20) of the valve device.

Description

Die Erfindung betrifft eine Einspritzeinrichtung und ein Verfahren zum Einspritzen von Fluid nach dem Oberbegriff der unabhängigen Ansprüche.The invention relates to an injection device and a method for injecting fluid according to the preamble of the independent claims.

Stand der TechnikState of the art

Eine Vorrichtung und ein Verfahren zum Einspritzen von Kraftstoff sind beispielsweise aus der EP 0 562 046 B 1 bekannt. Die Grundanforderung an ein solches System besteht darin, die Kraftstoffeinspritzung mit einem möglichst großen Einspritzdruck vorzunehmen. Ein hoher Einspritzdruck hat positive Einflüsse auf die Funktion eines Motors; zum Beispiel werden die Schadstoffemissionen und der Kraftstoffverbrauch herabgesetzt. Zur Realisierung des hohen Einspritzdruckes ist ein Druckverstärker vorgesehen, welcher durch eine hydraulische Übersetzung einen primären, etwa von einem Druckspeicher zur Verfügung gestellten Druck in den erwünschten hohen Einspritzdruck umsetzt. Durch die geeignete Wahl der mit Kraft beaufschlagten Flächen und die Gegenkräfte elastischer Mittel kann eine geeignete Druckverstärkung eingestellt werden.An apparatus and a method for injecting fuel are known, for example, from EP 0 562 046 B1. The basic requirement of such a system is to carry out the fuel injection with the largest possible injection pressure. A high injection pressure has positive effects on the function of a motor; For example, pollutant emissions and fuel consumption are reduced. To realize the high injection pressure, a pressure booster is provided, which converts a primary, provided by a pressure accumulator available pressure in the desired high injection pressure by a hydraulic transmission. By suitable choice of the acted upon surfaces and the counter forces of elastic means a suitable pressure gain can be adjusted.

Die Ansteuerung von Druckverstärker und Einspritzdüse kann so erfolgen, dass zwei 2/2-Ventile vorgesehen sind, die jeweils von zwei getrennten Stellelementen angesteuert werden. Für jedes Stellelement ist dabei eine separate Ansteuerelektronik vorzusehen. Durch geeignete Abstimmung der Ansteuerelektroniken lassen sich Schaltabfolgen erreichen, mit denen unterschiedliche Einspritzvorgänge realisiert werden können. Allerdings ist die beschriebene apparative Lösung aufwendig.The control of pressure booster and injector can be done so that two 2/2-valves are provided, which are each controlled by two separate control elements. For each control element is to provide a separate control electronics. By suitable tuning of the control electronics, switching sequences can be achieved with which different injection processes can be realized. However, the described apparatus solution is expensive.

Eine Druckverstärkung ist insbesondere im Zusammenhang mit einem Common-Rail-System nützlich. Bei der Speichereinspritzung "Common-Rail" sind die primäre Druckerzeugung und die Einspritzung entkoppelt. Der Einspritzdruck wird unabhängig von der Motordrehzahl und der Einspritzmenge erzeugt und im "Rail" (Kraftstoffspeicher) für die Einspritzung bereitgestellt. Auf diese Weise lässt sich grundsätzlich ein günstiger Einspritzverlauf realisieren, da insbesondere Einspritzdruck und Einspritzmenge für jeden Betriebspunkt des Motors unabhängig voneinander festgelegt werden können. Allerdings ist der Druck im Common-Rail zur Zeit noch auf ca. 1600 bar begrenzt, so dass aus Emissionsgründen und Gründen des Kraftstoffverbrauchs eine Erhöhung des Druckes erwünscht ist. Zur Zeit sind Druckverstärker mit einem Übersetzungsverhältnis von 1:7 bekannt. Ein Druckverstärker in Kombination mit einem Common-Rail-System könnten somit besonders gute Ergebnisse liefern.A pressure boost is particularly useful in conjunction with a common rail system. In common-rail accumulator injection, primary pressure generation and injection are decoupled. The injection pressure is generated independently of the engine speed and the injection quantity and in the "rail" (Fuel storage) provided for the injection. In principle, a favorable course of injection can be realized in this way, since in particular injection pressure and injection quantity can be determined independently of one another for each operating point of the engine. However, the pressure in the common rail is currently limited to about 1600 bar, so that an increase in pressure is desired for emission reasons and reasons of fuel consumption. At the moment, pressure amplifiers with a gear ratio of 1: 7 are known. A pressure intensifier in combination with a common rail system could thus provide particularly good results.

In der nachveröffentlichten internationalen Patentanmeldung WO 01/29409 A1 wird bereits vorgeschlagen, eine Einspritzeinrichtung mit Einspritzdüsen und mit einem Druckverstärker durch zwei gemeinsam betätigbare 2/2-Ventile anzusteuern, wobei die beiden 2/2-Ventile von einem gemeinsamen Stellelement über einen gemeinsamen hydraulischen Kopplungsraum betätigt werden. Die beiden 2/2-Ventile sind dabei derart hydraulisch mit dem Druckverstärker verbundnen, dass die Schaltzustände der beiden 2/2-Ventile den Druckverstärker ansteuern, so dass die Ansteuerung der Einspritzdüsen immer über den Druckverstärker erfolgt.In the post-published international patent application WO 01/29409 A1 is already proposed to control an injector with injectors and with a pressure booster by two jointly operable 2/2 valves, the two 2/2 valves of a common actuator via a common hydraulic coupling space be operated. The two 2/2 valves are so hydraulically connected to the pressure booster that the switching states of the two 2/2-valves control the pressure booster, so that the control of the injectors always takes place via the pressure booster.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Einspritzeinrichtung und das erfindungsgemäße Verfahren haben den Vorteil, dass sich mit einem einzigen Stellelement über zwei 2/2-Ventile unterschiedliche Einspritzraten für die Einspritzungen erzielen lassen, was insbesondere im Zusammenhang mit der Verwendung der Erfindung bei einem Common-Rail-System nützlich ist.The injection device according to the invention and the method according to the invention have the advantage that different injection rates for the injections can be achieved with a single control element via two 2/2 valves, which is particularly useful in connection with the use of the invention in a common rail system ,

Mit der Erfindung ist es möglich, den apparativen Aufwand bei der Verwendung von zwei Ventilen weiter zu verringern. Ein einziger Kopplungsraum reicht aus, da sich die 2/2-Ventile in geeigneter Weise aufeinander abstimmen lassen. Beispielsweise kann erreicht werden, dass die Ventile durch eine geeignete Einstellung hydraulischer Druckflächen und elastischer Mittel zu unterschiedlichen Zeitpunkten bzw. zu unterschiedlichen Aktivierungszuständen (Teilhub/Vollhub) auf die Betätigung durch das Weiterhin zeigt die US-5 143 291 einen Injektor mit einem mittels eines Solenoids betätigten Vorsteuerventil, welches ein Tellerventil und ein Entleerungsventil betätigt. Ein Druckverstärker zum Verstärken des primären Drucks ist vorgesehen. Die EP-0 829 640 A2 zeigt einen Injektor, welcher einen ersten Solenoid und einen zweiten Solenoid aufweist, um jeweils ein Ventil zu betätigen. Weiterhin offenbart diese Druckschrift ebenfalls einen Druckverstärker.With the invention, it is possible to further reduce the expenditure on equipment when using two valves. A single coupling space is sufficient, since the 2/2 valves can be suitably matched to one another. By way of example, it can be achieved that the valves can be actuated by a suitable setting of hydraulic pressure surfaces and elastic means at different times or at different activation states (partial lift / full lift) Furthermore, US-5 143 291 shows an injector with a solenoid actuated pilot valve which operates a poppet valve and a drain valve. A pressure intensifier for boosting the primary pressure is provided. EP-A-0 829 640 A2 shows an injector having a first solenoid and a second solenoid for actuating one valve each. Furthermore, this document also discloses a pressure booster.

Stellelement reagieren. Der hydraulische Kopplungsraum kann auch einer Kraft-Weg-Übersetzung und dem Ausgleich von Toleranzen, z.B. Lägenänderungen dienen.Actuate react. The hydraulic coupling space can also be a force-displacement ratio and the compensation of tolerances, e.g. Serve position changes.

Vorzugsweise wird der primäre Druck von einem Common-Rail zur Verfügung gestellt. Es ist somit möglich, die Vorteile eines Common-Rail-Systems mit der druckverstärkten Einspritzeinrichtung zu kombinieren. Der Common-Rail-Druck, welcher zur Zeit auf ca. 1600 bar begrenzt ist, kann druckverstärkt werden; somit werden Emissionen und der Kraftstoffverbrauch reduziert.Preferably, the primary pressure is provided by a common rail. It is thus possible to combine the advantages of a common-rail system with the pressure-enhanced injection device. The common rail pressure, which is currently limited to about 1600 bar, can be pressure-boosted; thus emissions and fuel consumption are reduced.

Besonders vorteilhaft ist es, wenn das Einspritzsystem hubgesteuert ist. Es liegt somit ein Steuerraum vor, über dessen Entlastung sich die Einspritzdüse öffnen läßt. Auf diese Weise ist es möglich, bei einem vergleichsweise geringen Druck im Zuführbereich der Einspritzdüse, die Einspritzdüse gleichwohl zu öffnen und so eine Einspritzung - etwa eine Voreinspritzung - mit geringem Druck vorzunehmen, zum Beispiel bei Rail-Druck.It is particularly advantageous if the injection system is stroke-controlled. There is thus a control room, via whose discharge the injection nozzle can be opened. In this way, it is possible, at a comparatively low pressure in the feed region of the injection nozzle, nevertheless to open the injection nozzle and thus carry out an injection - for example a pilot injection - at low pressure, for example at rail pressure.

Vorzugsweise verschließt das erste 2/2-Ventil in einem ersten Zustand einen Steuerraum für eine Hubsteuerung, und das erste 2/2-Ventil öffnet in einem zweiten Zustand den Steuerraum für die Hubsteuerung. Eine Betätigung des ersten 2/2-Ventils reicht somit aus, um eine Einspritzung zu veranlassen.Preferably, in a first state, the first 2/2 valve closes a control room for a lift control, and the first 2/2 valve opens the control room for the lift control in a second state. An actuation of the first 2/2 valve is thus sufficient to cause an injection.

Bevorzugt trennt das zweite 2/2-Ventil in einem ersten Zustand einen Rückraum des Druckverstärkers von einem Rücklaufsystem, und das zweite 2/2-Ventil koppelt in einem zweiten Zustand den Rückraum des Druckverstärkers mit dem Rücklaufsystem. Der Rückraum stellt somit einen Steuerraum für den Druckverstärker dar. Durch ein Öffnen des zweiten 2/2-Ventils wird folglich der Rückraum des Druckverstärkers entlastet, was zu einer Druckverstärkung durch den Druckverstärker führt. Dieser Druck wird der Einspritzdüse zugeführt, so daß eine Einspritzung mit hohem Druck erfolgen kann. Diese erfolgt bei höherem Druck als die Einspritzung aufgrund der Betätigung des ersten 2/2-Ventils. Folglich können die Vorteile beider Einspritzvorgänge miteinander kombiniert werden.
Vorteilhafterweise sind das erste 2/2-Ventil und das zweite 2/2-Ventil so aufeinander abgestimmt, daß durch teilweises Betätigen des Stellelementes zunächst das erste 2/2-Ventil aus seinem ersten Zustand in seinen zweiten Zustand überführbar ist und daraufhin durch weiteres Betätigen des Stellelementes das zweite 2/2-Ventil aus seinem ersten Zustand in seinen zweiten Zustand überführbar ist. Somit läßt sich z.B. die durch das erste 2/2-Ventil erfolgende Hubsteuerung für eine Voreinspritzung bei niedrigem Rail-Druck nutzen, während die Betätigung des ersten Ventils mit nachfolgender Betätigung des zweiten 2/2-Ventils für eine Haupteinspritzung mit erhöhtem Druck genutzt wird. Es ist somit eine getrennte Ansteuerung der Einspritzdüse (Hubsteuerung) und des Druckaufbaus durch den Druckverstärker möglich. Dies erlaubt eine vielfältige Formung des Einspritzdruckverlaufes.In a first state, the second 2/2 valve preferably separates a rear space of the pressure intensifier from a return system, and the second 2/2 valve, in a second state, couples the rear space of the pressure intensifier to the return system. The back space thus represents a control chamber for the pressure booster. By opening the second 2/2-valve consequently the back space of the pressure booster is relieved, which leads to a pressure increase by the pressure booster. This pressure is supplied to the injection nozzle, so that injection can be carried out at high pressure. This is done at a higher pressure than the injection due to the actuation of the first 2/2 valve. Consequently, the advantages of both injections can be combined.
Advantageously, the first 2/2-way valve and the second 2/2-valve are coordinated so that by partially actuating the control element first, the first 2/2-valve can be converted from its first state to its second state and then the second 2/2-valve can be converted from its first state to its second state by further actuation of the actuating element. Thus, for example, the lift control effected by the first 2/2 valve can be used for a low rail pressure pilot injection while the operation of the first valve is used with subsequent operation of the second 2/2 valve for a main high pressure injection. It is thus a separate control of the injector (stroke control) and the pressure build-up by the pressure booster possible. This allows a diverse shaping of the injection pressure curve.

Vorteilhafterweise ist ein Steuerraum für die Hubsteuerung über eine erste Drossel mit dem ersten 2/2-Ventil verbunden, und der Steuerraum für die Hubsteuerung ist über eine zweite Drossel mit dem Zuführbereich der Einspritzdüse verbunden. Durch den Durchflußunterschied dieser Drosseln läßt sich die Öffnungsgeschwindigkeit der Düsennadel bei der hubgesteuerten Einspritzung bestimmen.Advantageously, a control chamber for the stroke control via a first throttle with the first 2/2-valve is connected, and the control chamber for the stroke control is connected via a second throttle to the feed region of the injection nozzle. Due to the flow difference of these throttles, the opening speed of the nozzle needle can be determined in the stroke-controlled injection.

Vorzugsweise ist ein Arbeitsdruckraum des Druckverstärkers mit einem Hochdruckraum des Druckverstärkers über ein Rückschlagventil verbunden, über welches der Hochdruckraum befüllbar ist. Eine solche Befüllung des Hochdruckraums ist bei jedem Einspritzzyklus erforderlich, damit Fluid für die Hochdruckeinspritzung zur Verfügung steht. Ein Rückschlagventil verhindert, daß der hohe Druck aus dem Hochdruckraum des Druckverstärkers in den Arbeitsdruckraum des Druckverstärkers gelangt; andererseits ermöglicht das Rückschlagventil die Befüllung des Hochdruckraumes aus dem Arbeitsdruckraum.Preferably, a working pressure chamber of the pressure booster is connected to a high-pressure chamber of the pressure booster via a check valve, via which the high-pressure chamber can be filled. Such filling of the high-pressure space is required at every injection cycle, so that fluid is available for the high-pressure injection. A check valve prevents the high pressure from the high-pressure chamber of the pressure intensifier enters the working pressure chamber of the pressure intensifier; On the other hand, the check valve allows the filling of the high-pressure chamber from the working pressure chamber.

Vorteilhafterweise ist zusätzlich zu dem Rückschlagventil eine damit in Reihe geschaltete Drossel vorgesehen. Durch diese Maßnahme wird bei einem unerwünschten, erhöhten Leckagestrom im Injektor, z.B. durch Nadelklemmen, eine Druckdifferenz zwischen dem Arbeitsdruckraum und dem Hochdruckraum erzeugt.Advantageously, in addition to the check valve, a choke connected in series with it is provided. By doing so, if there is an undesirable, increased leakage current in the injector, e.g. produced by needle clamps, a pressure difference between the working pressure chamber and the high-pressure chamber.

Bevorzugt ist ein Arbeitsdruckraum des Druckverstärkers über ein Rückschlagventil mit einem Rückraum des Druckverstärkers verbunden, über welches der Rückraum entlastbar ist. Dadurch nimmt der Druckverstärkerkolben bei einer Druckdifferenz zwischen dem Arbeitsdruckraum und dem Hochdruckraum seinen Maximalhub ein und verschließt in dieser Position die Verbindungsleitung zum Injektor. Auf diese Weise wird der entsprechende Injektor im Schadensfall abgeschaltet.Preferably, a working pressure chamber of the pressure booster is connected via a check valve to a rear space of the pressure booster, via which the rear space can be relieved. As a result, the pressure intensifier piston assumes its maximum lift at a pressure difference between the working pressure chamber and the high-pressure chamber and closes the connecting line to the injector in this position. In this way, the corresponding injector is switched off in case of damage.

Besonders vorteilhaft ist auch, wenn ein Rückraum des Druckverstärkers aus dem Arbeitsdruckraum befüllbar ist. Dies kann beispielsweise über eine Drossel erfolgen. Ein schlagartiges Ansteigen des Druckes im Rückraum wird aufgrund der Drossel nicht gestattet. Jedoch ist es möglich den Rückraum über die Drossel zu befüllen, so daß der Druckverstärker für den nächsten Einspritzvorgang bereit ist.It is also particularly advantageous if a rear space of the pressure intensifier can be filled from the working pressure chamber. This can be done for example via a throttle. A sudden increase in the pressure in the back space is not allowed due to the throttle. However, it is possible to fill the rear space via the throttle, so that the pressure booster is ready for the next injection process.

Es kann vorteilhaft sein, wenn das Stellelement zwischen dem Druckverstärker und der Ventileinrichtung angeordnet ist. Auf diese Weise kann beispielsweise das erste 2/2-Ventil in die Nähe der Einspritzdüse rücken, was eine unnötige Vergrößerung des Steuerraums vermeidet.
Es kann aber auch nützlich sein, wenn das Stellelement zwischen dem ersten 2/2-Ventil und dem zweiten 2/2-Ventil angeordnet ist. Insbesondere kann das Stellelement so angeordnet sein, daß seine Bewegung senkrecht zur Längsausdehnung der Einspritzeinrichtung verläuft. Auch dies hat Vorteile im Hinblick auf die Minimierung der Volumina des Steuerraums der Hubsteuerung und auch des Druckverstärkers.It may be advantageous if the adjusting element is arranged between the pressure booster and the valve device. In this way, for example, the first 2/2-valve can move into the vicinity of the injection nozzle, which avoids an unnecessary increase of the control chamber.
However, it may also be useful if the actuator is located between the first 2/2 valve and the second 2/2 valve. In particular, the actuator may be arranged so that its movement is perpendicular to the longitudinal extent of the injector. This also has advantages in the With regard to the minimization of the volumes of the control space of the stroke control and also the pressure booster.

Es kann ebenfalls vorteilhaft sein, daß das Stellelement oberhalb von Ventileinrichtung und Druckverstärker angeordnet ist. Diese Variante bietet die Möglichkeit einer sehr kompakten Bauform.It may also be advantageous that the adjusting element is arranged above the valve device and pressure booster. This variant offers the possibility of a very compact design.

Vorzugsweise ist das Stellelement ein Piezoaktor. Piezoaktoren haben sich als elektronisch ansteuerbare Stellelemente bewährt, insbesondere da sie in ihrem Aufbau kompakt sind und zuverlässig arbeiten. Ferner ist die Stellfunktion durch Veränderung der Parameter (Spannung, Impulsdauer) der Ansteuerung veränderbar.Preferably, the actuator is a piezoelectric actuator. Piezo actuators have proven to be electronically controllable positioning elements, in particular because they are compact in construction and work reliably. Furthermore, the control function can be changed by changing the parameters (voltage, pulse duration) of the control.

Es kann allerdings auch nützlich sein, daß das Stellelement und die Ventileinrichtung durch ein Magnetventil mit zwei Ventilkörpern verwirklicht sind, wobei ein erster Ventilkörper mit einem Ventildichtsitz und ein zweiter Ventilkörper mit einem Ventildichtsitz koaxial ineinander angeordnet sind. Vorteilhafterweise ist dabei der erste Ventilkörper durch ein Verbindungsglied, das sich innerhalb des zweiten Ventilkörpers befindet, mit dem Stellelement verbunden ist. Besonders zu bevorzugen ist, daß die Führung des ersten Ventilkörpers außerhalb des zweiten Ventilkörpers liegt. Die Erfindung ist also nicht auf den Einsatz eines Piezoaktors beschränkt. Vielmehr ist eine kompakte und zuverlässige Variante auch auf der Grundlage der angegebenen Ausführungsformen mit Magnetventil realisierbar.However, it may also be useful that the actuator and the valve means are realized by a solenoid valve with two valve bodies, wherein a first valve body with a valve seat and a second valve body with a valve seat are arranged coaxially with each other. Advantageously, while the first valve body is connected by a connecting member which is located within the second valve body, with the actuating element. It is particularly preferable that the guide of the first valve body is located outside of the second valve body. The invention is therefore not limited to the use of a piezoelectric actuator. Rather, a compact and reliable variant can also be realized on the basis of the specified embodiments with a solenoid valve.

Dabei ist besonders bevorzugt, daß das erste 2/2-Ventil und das zweite 2/2-Ventil über einen gemeinsamen hydraulischen Kopplungsraum von dem Stellelement betätigt werden. Es ist also auch an dieser Stelle ein verringerter apparativer Aufwand zu verzeichnen; das erfindungsgemäße Verfahren kann einfach gestaltet werden.It is particularly preferred that the first 2/2 valve and the second 2/2 valve are actuated by a common hydraulic coupling space of the actuator. It is therefore also at this point a reduced expenditure on equipment to record; the inventive method can be easily designed.

Vorzugsweise wird das Betätigen des ersten 2/2-Ventils zur Voreinspritzung verwendet. Es kann somit mit geringem Druck und geringer Einspritzmenge eine Einspritzung vorgenommen werden.Preferably, the actuation of the first 2/2-valve is used for pre-injection. It can thus be made with low pressure and low injection quantity injection.

Besonders nützlich ist es, wenn das Öffnen eines der 2/2-Ventile durch einen geringeren Hub des Stellelementes bewirkt wird als das Öffnen des anderen der 2/2-Ventile. Insbesondere bei einem Piezoaktor kann die Variation des Hubs durch die Eingangsgrößen der elektronischenr- Ansteuerung (Spannung, Impulsdauer) erreicht werden. Bei einer besonders bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird durch teilweises Betätigen des Stellelementes ein erstes Ventil geöffnet, wobei eine Voreinspritzung bei geringem Druck beginnt, und daraufhin durch Rückstellen des Stellelementes das erste Ventil geschlossen, so daß die Einspritzung beendet wird. Mit der Erfindung ist es also möglich, eine Voreinspritzung unabhängig von eventuell weiteren Vorgängen während des Einspritzverlaufs vorzunehmen.It is particularly useful if the opening of one of the 2/2 valves is effected by a smaller stroke of the actuator than the opening of the other of the 2/2 valves. In particular, in the case of a piezoelectric actuator, the variation of the stroke can be achieved by the input variables of the electronic control (voltage, pulse duration). In a particularly preferred embodiment of the method according to the invention, a first valve is opened by partial actuation of the actuating element, wherein a pre-injection begins at low pressure, and then closed by resetting the actuating element, the first valve, so that the injection is terminated. With the invention, it is thus possible to carry out a pilot injection independently of any further operations during the course of the injection.

Das erfindungsgemäße Verfahren ist besonders dadurch vorteilhaft, daß durch teilweises Betätigen des Stellelementes ein Steuerraum entlastet wird, so daß die Einspritzdüse öffnet und eine Einspritzphase bei geringem Druck beginnt, daraufhin durch weiteres Betätigen des Stellelementes ein Rückraum des Druckverstärkers mit einem Rücklaufsystem durch Öffnen des zweiten 2/2-Ventils verbunden wird, daraufhin eine Druckerhöhung des Einspritzdruckes durch den Druckverstärker erfolgt, so daß nun eine Einspritzphase bei hohem Druck stattfindet und daraufhin durch Rückstellen des Stellelementes das erste 2/2-Ventil und das zweite 2/2-Ventil schließen, so daß die Einspritzung beendet wird. Es ist somit möglich eine günstige Abfolge von Voreinspritzung und Haupteinspritzung sowie eine "boot"-förmige Haupteinspritzung bereitzustellen, indem ein einziges Stellelement über vorzugsweise einen einzigen Kopplungsraum mit zwei 2/2-Ventilen kommuniziert. Die Vorteile einer hubgesteuerten Voreinspritzung werden mit den Vorteilen eines ansteigenden Druckverlaufes bei der Haupteinspritzung kombiniert.
Es kann auch nützich sein, daß durch Betätigen des Stellelementes ein Rückraum des Druckverstärkers mit einem Rücklaufsystem durch Öffnen des zweiten 2/2-Ventils verbunden wird und eine Druckverstärkung durch den Druckverstärker erfolgt und daß durch weiteres Betätigen des Stellelementes ein Steuerraum entlastet wird, so daß die Einspritzdüse öffnet und eine Einspritzphase bei hohem Druck vorliegt. Bei dieser Variante kann in vorteilhafter Weise eine Nacheinspritzung auf hohem Druckniveau erfolgen: durch Rückschalten aus der zweiten Schaltstellung in die erste Schaltstellung wird nur die Einspritzdüse geschlossen, wobei der Druckverstärker aktiv bleibt. Erneutes Schalten in die zweite Schaltstellung öffnet dann die Einspritzdüse für eine Nacheinspritzung bei hohem Druck.The inventive method is particularly advantageous in that a control chamber is relieved by partial actuation of the actuating element, so that the injection nozzle opens and an injection phase at low pressure, then by further actuation of the actuator a rear space of the pressure booster with a return system by opening the second 2nd / 2-valve is connected, then an increase in pressure of the injection pressure by the pressure booster takes place, so that now takes place an injection phase at high pressure and then close by resetting the actuator, the first 2/2-valve and the second 2/2-valve, so that the injection is finished. It is thus possible to provide a favorable sequence of pre-injection and main injection as well as a "boot" -shaped main injection by communicating with a single actuator via preferably a single coupling space with two 2/2 valves. The advantages of a stroke-controlled pre-injection are combined with the advantages of an increasing pressure curve in the main injection.
It may also be useful that by operating the actuator a back space of the pressure intensifier is connected to a return system by opening the second 2/2-valve and a pressure gain through the pressure booster and that by further actuation of the actuating element, a control chamber is relieved, so that the injection nozzle opens and an injection phase is present at high pressure. In this variant, a post-injection can be carried out at a high pressure level in an advantageous manner: by switching back from the second switching position to the first switching position only the injector is closed, the pressure intensifier remains active. Re-switching to the second switching position then opens the injector for a post-injection at high pressure.

Bevorzugt wird der Hochdruckraum des Druckverstärkers über ein Rückschlagventil befüllt, über welches er mit dem Arbeitsdruckraum verbunden ist. Da im Arbeitsdruckraum ein ausreichendes Fluidreservoir vorhanden ist, ist es nützlich, dieses zur Befüllung des Hochdruckraumes über ein Rückschlagventil zu nutzen. Umgekehrt kann durch das Rückschlagventil der hohe Druck aus dem Hochdruckraum nicht in den Arbeitsdruckraum des Druckverstärkers übertreten; der Druck wird vollständig zur Ansteuerung der Einspritzdüse genutzt.Preferably, the high-pressure chamber of the pressure booster is filled via a check valve, via which it is connected to the working pressure chamber. Since a sufficient fluid reservoir is present in the working pressure chamber, it is useful to use this for filling the high-pressure chamber via a check valve. Conversely, can not pass through the check valve, the high pressure from the high-pressure chamber in the working pressure chamber of the pressure booster; the pressure is fully used to control the injector.

Vorzugsweise wird ein Rückraum des Druckverstärkers aus dem Arbeitsdruckraum des Druckverstärkers befüllt. Dies kann beispielsweise über eine Drossel erfolgen. Die Drossel gestattet somit eine Befüllung und somit eine Bereitstellung des Druckverstärkers für den nächsten Einspritzvorgang; sie vermeidet aber eine unerwünschte Übertragung einer schnellen Druckänderung aus dem Arbeitsdruckraum des Druckverstärkers in den Rückraum.Preferably, a rear space of the pressure intensifier is filled from the working pressure chamber of the pressure intensifier. This can be done for example via a throttle. The throttle thus allows a filling and thus a provision of the pressure booster for the next injection process; but it avoids an undesirable transfer of a rapid change in pressure from the working pressure chamber of the pressure booster in the rear space.

Das Verfahren ist besonders dann vorteilhaft, wenn durch den zeitlichen Verlauf der Ansteuerung des Stellelementes und/oder durch die Auslegung der Ventilschaltkräfte eine Einspritzverlaufsformung vorgenommen wird. Das System bietet somit zahlreiche Variationsmöglichkeiten, welche sowohl durch die Auslegung der Komponenten fest installiert werden können oder auch durch die Ansteuerung des Stellelementes im Prozeß verändert werden können.The method is particularly advantageous if an injection profile is formed by the time profile of the control of the actuating element and / or by the interpretation of the valve switching forces. The system thus offers numerous possibilities of variation, which can be permanently installed both by the design of the components or can also be changed by the control of the control element in the process.

Die Erfindung zeichnet sich dadurch besonders aus, daß durch die Verwendung von zwei 2/2-Ventilen, die von einem gemeinsamen Stellelement über einen gemeinsamen Kopplungsraum betätigt werden, eine Einspritzeinrichtung mit Druckverstärker in zuverlässiger Weise gesteuert werden kann. Es ist daher nicht mehr erforderlich getrennte elektronische und hydraulische Ansteuerungen für Druckverstärker und Einspritzdüse vorzusehen. Hierdurch ergibt sich eine vorteilhafte Verminderung des apparativen Aufwandes. In einer bevorzugten Ausführungsform der Erfindung lassen sich die Vorteile einer hubgesteuerten Voreinspritzung mit den Vorteilen eines ansteigenden Druckverlaufs bei der Haupteinspritzung in vorteilhafter Weise kombinieren.The invention is particularly characterized in that by using two 2/2-valves, which are actuated by a common actuator via a common coupling space, an injector with pressure booster can be controlled in a reliable manner. It is therefore no longer necessary to provide separate electronic and hydraulic controls for pressure booster and injector. This results in an advantageous reduction of the expenditure on equipment. In a preferred embodiment of the invention, the advantages of a stroke-controlled pilot injection can be advantageously combined with the advantages of an increasing pressure curve in the main injection.

Zeichnungdrawing

Die Erfindung wird nun mit Bezug auf die Zeichnung anhand spezieller Ausführungsformen beispielhaft erläutert.

  • Figur 1 zeigt eine erste Ausführungsform einer erfindungsgemäßen Einspritzeinrichtung;
  • Figur 2 zeigt eine zweite Ausführungsform einer erfindungsgemäßen Einspritzeinrichtung;
  • Figur 3 zeigt eine dritte Ausführungsform einer erfindungsgemäßen Einspritzeinrichtung;
  • Figur 4 zeigt einen Hydraulikschaltplan mit wichtigen Systemkomponenten;
  • Figur 5 zeigt eine vierte Ausführungsform einer erfindungsgemäßen Einspritzeinrichtung.
The invention will now be described by way of example with reference to the drawings with reference to specific embodiments.
  • FIG. 1 shows a first embodiment of an injection device according to the invention;
  • FIG. 2 shows a second embodiment of an injection device according to the invention;
  • FIG. 3 shows a third embodiment of an injection device according to the invention;
  • FIG. 4 shows a hydraulic circuit diagram with important system components;
  • FIG. 5 shows a fourth embodiment of an injection device according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 ist eine erste Ausführungsform einer erfindungsgemäßen Einspritzeinrichtung 10 dargestellt. Eine Einspritzdüse 12 dient der Einspritzung von Kraftstoff in den Brennraum eines Motors, insbesondere eines Dieselmotors. Der Einspritzdüse 12 wird Kraftstoff mit einem Druck aus einem Druckverstärker 16 zur Verfügung gestellt. Die Einspritzdüse 12 wird von einem ersten 2/2-Ventil 18 angesteuert. Der Druckverstärker 16 wird von einem zweiten 2/2-Ventil 20 gesteuert. Beide 2/2-Ventile 18, 20 werden von einem Piezoaktor 22 über einen gemeinsamen hydraulischen Kopplungsraum 24 betrieben. Im geschlossenen Zustand des ersten 2/2-Ventils 18 baut sich in einem Steuerraum 44 ein Druck auf, welcher im Normalfall dem Druck eines Druckspeichers (Common-Rail) 26 entspricht; dieses stellt den primären Druck für die Einspritzeinrichtung 10 zur Verfügung. Der Druck im Steuerraum 44 übt eine Schließkraft auf die Einspritzdüse 12 aus, wodurch die Einspritzdüse geschlossen wird. Durch Öffnen des ersten 2/2-Ventils 18 wird der Steuerraum 44 entlastet, die Schließkraft verringert sich, und die Einspritzdüse 12 kann durch diese Hubsteuerung öffnen. Das zweite 2/2-Ventil 20 sperrt im geschlossenen Zustand eine Verbindung zwischen dem Rücklaufsystem 34 der Einspritzeinrichtung und einem Rückraum 46 des Druckverstärkers 16. Öffnet das zweite 2/2-Ventil 20, so kann eine Entlastung des Rückraums 46 erfolgen und somit eine Druckverstärkung durch den Druckverstärker 16. Der Arbeitsdruckraum 32 und der Hochdruckraum 36 des Druckverstärkers 16 sind über ein Rückschlagventil 38 und eine Drossel 56 miteinander verbunden. Somit läßt sich der Hochdruckraum 36 über das Rückschlagventil 38 aus dem Arbeitsdruckraum 32 zur Vorbereitung auf die nächste Druckverstärkung wieder befüllen, während die Drossel 56 verhindert, daß der Befüllungspfad bei einer Einspritzung als Bypass wirkt. Ein weiteres Rückschlagventil 48 ist vorgesehen, über welches der Arbeitsdruckraum 32 mit dem Rückraum 46 des Druckverstärkers 16 verbunden ist. Das Rückschlagventil 48 verhindert die Ausbildung eines Überdruckes im Rückraum 46 des Druckverstärkers. Eine parallel zu dem Rückschlagventil 48 geschaltete Drossel 50 gestattet die Wiederbefüllung des Rückraums 46, vermeidet aber eine unerwünschte schlagartige Druckübertragung zwischen Arbeitsdruckraum 32 und Rückraum 46. Zur Festlegung der Öffnungsgeschwindigkeit der Düsennadel der Einspritzdüse 12 sind zwei weitere Drosseln 52, 54 als Zulaufdrossel 52 bzw. Ablaufdrossel 54 des Steuerraums 44 vorgesehen. Es ist zu bemerken, daß insbesondere das Rückschlagventil 48 und die Drossel 56 zwar im Hinblick auf die Eigensicherheit des Systems erhebliche Vorteile mit sich bringen, jedoch grundsätzlich für die Funktionsfähigkeit des Systems nicht entscheidend sein müssen.FIG. 1 shows a first embodiment of an injection device 10 according to the invention. An injection nozzle 12 serves to inject fuel into the combustion chamber of an engine, in particular a diesel engine. The injector 12 is provided with fuel from a pressure booster 16 fuel. The injection nozzle 12 is driven by a first 2/2-valve 18. The pressure booster 16 is controlled by a second 2/2 valve 20. Both 2/2 valves 18, 20 are operated by a piezoelectric actuator 22 via a common hydraulic coupling chamber 24. In the closed state of the first 2/2-valve 18, a pressure builds up in a control chamber 44, which normally corresponds to the pressure of a pressure accumulator (common rail) 26; this provides the primary pressure for the injector 10. The pressure in the control chamber 44 exerts a closing force on the injection nozzle 12, whereby the injection nozzle is closed. By opening the first 2/2-valve 18, the control chamber 44 is relieved, the closing force decreases, and the injector 12 can open by this stroke control. The second 2/2-valve 20 closes in the closed state, a connection between the return system 34 of the injector and a rear chamber 46 of the pressure booster 16. Opens the second 2/2-valve 20, so there is a relief of the back space 46 and thus a pressure gain by the pressure amplifier 16. The working pressure chamber 32 and the high-pressure chamber 36 of the pressure booster 16 are connected via a check valve 38 and a throttle 56 with each other. Thus, the high-pressure chamber 36 can be via the check valve 38 from the working pressure chamber 32 in preparation for the next pressure boost refill while the throttle 56 prevents the filling path acts as a bypass during an injection. A further check valve 48 is provided, via which the working pressure chamber 32 is connected to the rear space 46 of the pressure booster 16. The check valve 48 prevents the formation of an overpressure in the rear space 46 of the pressure booster. A parallel to the check valve 48 connected throttle 50 allows the refilling of the back space 46, but avoids an undesirable sudden pressure transfer between working pressure chamber 32 and rear space 46. To determine the opening speed of the nozzle needle of the injector 12 are two more throttles 52, 54 as inlet throttle 52 and Outflow throttle 54 of the control chamber 44 is provided. It should be noted that, in particular, the check valve 48 and the throttle 56, although in view of the intrinsic safety of the system bring significant benefits, but in principle must not be critical to the functioning of the system.

Der Betrieb der Einspritzeinrichtung 10 kann beispielsweise so erfolgen, daß der Piezoaktor 22 zunächst in einer Weise aktiviert wird, daß nur ein geringer Hub (Teilhub) erfolgt. Dieser Hub wird so gewählt, daß das erste 2/2-Ventil 18 öffnet, das zweite 2/2-Ventil 20 jedoch noch geschlossen bleibt. Durch das Öffnen des ersten 2/2-Ventils 18 wird der Steuerraum 44 über die Drossel 54 entlastet, und es erfolgt ein hubgesteuertes Öffnen der Einspritzdüse 12. Zu diesem Zeitpunkt liegt im Normalfall der Druck des Common-Rail 26 über den Arbeitsdruckraum 32 des Druckverstärkers 16, die Drossel 56 und das Rückschlagventil 38 an der Einspritzdüse 12 an. Es erfolgt eine Einspritzung mit niedrigem Einspritzdruck. Nachfolgend erfolgt ein größerer Hub des Piezoaktors 22, so daß auch das zweite 2/2-Ventil 20 öffnet. Dies hat eine Entlastung des Rückraums 46 des Druckverstärkers 16 zur Folge, da dieser über das zweite 2/2-Ventil 20 mit dem Rücklaufsystem 34 verbunden wird. Folglich kommt es zu einer Druckverstärkung durch den Druckverstärker 16. Es folgt eine Erhöhung des Einspritzdruckes und somit eine Einspritzphase mit hohem Einspritzdruck. Bei Deaktivierung des Piezoaktors 22 gehen die 2/2-Ventile 18, 20 wieder in ihre Ausgangsstellung zurück - zunächst das zweite 2/2-Ventil 20 und daraufhin das erste 2/2-Ventil 18. Bei einer teilweisen Deaktivierung bis zu einem Teilhub geht nur das zweite Ventil in seine Ausgangslage zurück. Es erfolgt eine Wiederbefüllung des Druckverstärkers 16. Der Rückraum 46 des Druckverstärkers 16 wird zur Rückstellung beispielsweise über die Drossel 50 mit Fluid aus dem Arbeitsdruckraum 26 des Druckverstärkers 16 befüllt. Der Hochdruckraum 36 des Druckverstärkers 16 wird über die Drossel 56 und das Rückschlagventil 38 aus dem Arbeitsdruckraum 32 des Druckverstärkers 16 befüllt. Die Ansteuerung des ersten 2/2-Ventils 18 mit geringem Hub des Piezoaktors 22 kann also in günstiger Weise zur Voreinspritzung mit geringem Druck genutzt werden.The operation of the injector 10 may for example be such that the piezoelectric actuator 22 is first activated in a manner that only a small stroke (partial stroke) takes place. This stroke is chosen so that the first 2/2-way valve 18 opens, the second 2/2-valve 20, however, still remains closed. By opening the first 2/2-valve 18, the control chamber 44 is relieved via the throttle 54, and there is a stroke-controlled opening of the injector 12. At this time, the pressure of the common rail 26 is normally above the working pressure chamber 32 of the pressure booster 16, the throttle 56 and the check valve 38 to the injector 12 at. There is an injection with low injection pressure. Subsequently, a larger stroke of the piezoelectric actuator 22, so that the second 2/2-valve 20 opens. This has a relief of the back space 46 of the pressure booster 16 to Sequence, since this is connected via the second 2/2-valve 20 with the return system 34. Consequently, there is a pressure increase by the pressure amplifier 16. It follows an increase in the injection pressure and thus an injection phase with a high injection pressure. When deactivating the piezoelectric actuator 22, the 2/2-valves 18, 20 go back to their original position - first the second 2/2-valve 20 and then the first 2/2-valve 18. In a partial deactivation goes to a partial stroke only the second valve back to its original position. There is a refilling of the pressure booster 16. The rear space 46 of the pressure booster 16 is filled to restore, for example via the throttle 50 with fluid from the working pressure chamber 26 of the booster 16. The high-pressure chamber 36 of the pressure booster 16 is filled via the throttle 56 and the check valve 38 from the working pressure chamber 32 of the pressure booster 16. The control of the first 2/2-valve 18 with a small stroke of the piezoelectric actuator 22 can thus be used in a favorable manner for pre-injection at low pressure.

In Figur 2 ist der Piezoaktor 22 seitlich an der Einspritzeinrichtung 10 angeordnet. Auf diese Weise kann für das erste 2/2-Ventil 18 und das zweite 2/2-Ventil 20 eine 180°-Anordnung gewählt werden. Eine solche Anordnung hat Vorteile im Hinblick auf die Minimierung der Volumina des effektiven Steuerraums für die Hubsteuerung sowie des Druckverstärkers 16. Komponenten, die jenen in Figur 1 entsprechen, sind mit denselben Bezugszeichen gekennzeichnet.In FIG. 2, the piezoelectric actuator 22 is arranged laterally on the injection device 10. In this way, a 180 ° arrangement can be selected for the first 2/2-way valve 18 and the second 2/2-way valve 20. Such an arrangement has advantages in terms of minimizing the volumes of the effective control space for the stroke control and the pressure booster 16. Components corresponding to those in Figure 1 are identified by the same reference numerals.

In Figur 3 ist eine weitere Anordnung der Komponenten der Einspritzeinrichtung dargestellt. Hier ist der Piezoaktor 22 über den Druckverstärker 16 angeordnet, was zu einer sehr kompakten Bauform führt. Wiederum sind Komponenten, die jenen in den Figuren 1 und 2 entsprechen, mit denselben Bezugszeichen gekennzeichnet.FIG. 3 shows a further arrangement of the components of the injection device. Here, the piezoelectric actuator 22 is disposed over the pressure amplifier 16, resulting in a very compact design. Again, components are those in Figures 1 and 2, identified by the same reference numerals.

In Figur 4 ist ein Hydraulikschaltplan dargestellt. Zur Erzeugung des Systemdruckes wird z. B. eine mengengeregelte Hochdruckpumpe verwendet. Der Kraftstoff wird auf einen regelbaren ersten Systemdruck von ca. 300 bar bis ca. 1500 bar komprimiert und in einem Druckspeicher (Common-Rail) 26 gespeichert. Die Einspritzung wird durch Nadelhubsteuerung über das Ventil 18 gesteuert, welches schematisch durch seine verschiedenen Schaltzustände dargestellt ist. Zusätzlich befindet sich zwischen dem Common Rail 26 und dem Injektor 14 ein Druckverstärker 16 zur Erhöhung des Einspritzdruckes. Der Druckverstärker 16 wird von einem 2/2-Ventil 20 angesteuert, welches ebenfalls schematisch durch seine verschiedenen Schaltzustände dargestellt ist. Zur Wiederbefüllung des Hochdruckraums 36 des Druckverstärkers 16 steht ein Bypass mit einem Rückschlagventil 38 zur Verfügung.FIG. 4 shows a hydraulic circuit diagram. To generate the system pressure z. B. uses a volume-controlled high-pressure pump. The fuel is compressed to a controllable first system pressure of about 300 bar to about 1500 bar and stored in a pressure accumulator (common rail) 26. The injection is controlled by needle lift control via the valve 18, which is schematically represented by its various switching states. In addition, located between the common rail 26 and the injector 14, a pressure booster 16 to increase the injection pressure. The pressure amplifier 16 is driven by a 2/2-valve 20, which is also shown schematically by its various switching states. For refilling the high-pressure chamber 36 of the pressure intensifier 16 is a bypass with a check valve 38 is available.

Prinzipiell können mit der dargestellten Anordnung Einspritzungen mit verschiedenen Drücken erfolgen. Ist das Ventil 20 geschlossen, so steht der gesamte Injektor 14 unter Raildruck; der Druckverstärker 16 ist in seiner Ausgangsstellung. Durch die Ansteuerung (Hubsteuerung) des Injektors 12 mit dem Ventil 18 kann eine Einspritzung mit Raildruck wie bei einem Common-Rail-System des Standes der Technik erfolgen. Soll eine Einspritzung mit erhöhtem Einspritzdruck erfolgen, so wird das Ventil 20 angesteuert. Somit wird der Druckverstärker 16 betätigt.In principle, injections with different pressures can take place with the illustrated arrangement. If the valve 20 is closed, the entire injector 14 is under rail pressure; the pressure amplifier 16 is in its starting position. By the control (stroke control) of the injector 12 with the valve 18, an injection with rail pressure can be carried out as in a common rail system of the prior art. If an injection with increased injection pressure, so the valve 20 is driven. Thus, the pressure booster 16 is operated.

Das besondere an der erfindungsgemäßen Anordnung besteht darin, daß beide Ventile 18, 20 mit demselben Aktor 22 angesteuert werden. Der Aktor 22 hat drei Stellungen - eine Ruhestellung und zwei Schaltstellungen. Die Einnahme der verschiedenen Stellungen wird durch Variation der Ansteuerung des Aktors 22 erreicht.The special feature of the arrangement according to the invention is that both valves 18, 20 are driven by the same actuator 22. The actuator 22 has three positions - a rest position and two switching positions. The taking of the different Positions is achieved by varying the control of the actuator 22.

Auf der linken Seite (a) der schematischen Ventildarstellung in Figur 4 ist ein Verfahrensablauf dargestellt, der eine Bootinjektion ermöglicht.

  • In Ruhestellung (RS) haben beide Ventile 18, 20 keinen Durchfluß. Über den Bypass-Pfad mit dem Rückschlagventil 38 liegt der Raildruck am Injektor 14 an. Die Einspritzdüse 12 ist aufgrund des Druckes im Steuerraum 44 geschlossen. der Druckverstärker 16 befindet sich in seiner Ausgangsposition.
  • Wird der Aktor 22 in die erste Schaltstellung (S1) gebracht, so schaltet das Ventil 18, welches den Injektor 14 ansteuert, auf Durchfluß. Das Ventil 20, welches den Druckverstärker 16 ansteuert, bleibt geschlossen. Folglich wird eine Einspritzung mit Raildruck eingeleitet. Hier muß nur der Steuerraum 44 des Injektors angesteuert werden, und es genügt ein kleiner Ventilhub. Daher ist es möglich eine Einspritzung mit schneller Schaltzeit vorzunehmen, so daß das hier beschriebene Verfahren vorteilhaft für eine Voreinspritzung genutzt werden kann.
  • In der zweiten Schaltstellung (S2) des Aktors 22 sind beide Ventile 18, 22 auf Durchfluß geschaltet. Somit sind sowohl der Steuerraum 44 des Injektors 14 als auch der Rückraum 46 des Druckverstärkers 16 entlastet. Folglich wird der Raildruck von dem Druckverstärker verstärkt, und es erfolgt eine Einspritzung mit erhöhtem Einspritzdruck.
On the left side (a) of the schematic valve representation in Figure 4, a process flow is shown, which allows a boot injection.
  • At rest (RS) both valves 18, 20 have no flow. About the bypass path with the check valve 38 of the rail pressure is applied to the injector 14. The injection nozzle 12 is closed due to the pressure in the control chamber 44. the pressure amplifier 16 is in its initial position.
  • If the actuator 22 is brought into the first switching position (S1), the valve 18, which activates the injector 14, switches to flow. The valve 20, which controls the pressure booster 16, remains closed. Consequently, a rail pressure injection is initiated. Here only the control chamber 44 of the injector must be controlled, and it is sufficient for a small valve lift. Therefore, it is possible to carry out an injection with a fast switching time, so that the method described here can be advantageously used for a pilot injection.
  • In the second switching position (S2) of the actuator 22, both valves 18, 22 are connected to flow. Thus, both the control chamber 44 of the injector 14 and the rear chamber 46 of the pressure intensifier 16 are relieved. As a result, the rail pressure is boosted by the booster, and injection with increased injection pressure occurs.

Wird das System also gemäß der Variante (a) in Figur 4 zunächst in die erste Schaltstellung (S1) gebracht und nach einer gewissen Verzögerung in die zweite Schaltstellung (S2) weitergeschaltet, so ergibt sich eine Bootinjektion.If the system according to the variant (a) in Figure 4, first in the first switching position (S1) and brought to a certain delay in the second switching position (S2) switched, so there is a boot injection.

Eine weitere Ausführungsform der Erfindung ist in Figur 4 auf der rechten Seite (b) dargestellt.

  • Die Ruhestellung (RS) entspricht derjenigen im Ausführungsbeispiel, welches auf der linken Seite (a) dargestellt ist.
  • In der ersten Schaltstellung (S1) wird das Ventil 20, welches den Druckverstärker 16 ansteuert, auf Durchfluß geschaltet. Damit ist der Druckverstärker 16 aktiviert.
  • In der zweiten Schaltstellung (S2) werden beide Ventile 18, 20 geöffnet, so daß zusätzlich der Injektor 14 angesteuert wird.
A further embodiment of the invention is shown in Figure 4 on the right side (b).
  • The rest position (RS) corresponds to that in the embodiment, which is shown on the left side (a).
  • In the first switching position (S1), the valve 20, which controls the pressure booster 16, switched to flow. Thus, the pressure amplifier 16 is activated.
  • In the second switching position (S2) both valves 18, 20 are opened, so that in addition the injector 14 is driven.

Bei dieser Variante (b) kann in vorteilhafter Weise eine Nacheinspritzung auf hohem Druckniveau erfolgen: durch Rückschalten aus der zweiten Schaltstellung (S2) in die erste Schaltstellung (S1) wird nur die Einspritzdüse 12 geschlossen, wobei der Druckverstärker 16 aktiv bleibt. Erneutes Schalten in die zweite Schaltstellung (S2) öffnet dann die Einspritzdüse 12 für eine Nacheinspritzung bei hohem Druck.In this variant (b) can be carried out at a high pressure level in an advantageous manner: by switching back from the second switching position (S2) in the first switching position (S1), only the injector 12 is closed, the pressure amplifier 16 remains active. Reverting to the second shift position (S2) then opens the injector 12 for a post-injection at high pressure.

In Figur 5 ist eine Ausführungsform der Erfindung dargestellt. Als Aktor 22 ist ein dreistufiger Magnetaktor vorgesehen. Die Ventile 18, 20 sind koaxial angeordnet.FIG. 5 shows an embodiment of the invention. As actuator 22, a three-stage magnetic actuator is provided. The valves 18, 20 are arranged coaxially.

In der ersten Schaltstellung, die durch die Ansteuerung mit einer niedrigen Schaltspannung eingenommen wird, wird nur der kleine Hub (h1) durchlaufen, bis der erste Ventilkörper 60 an einem zweiten Ventilkörper 62 anschlägt. Dabei bewegt sich nur der erste Ventilkörper 60, so daß ein Durchfluß am Ventilsitz 64 des Ventils 18 erfolgt. Der zweite Ventilkörper 62 verharrt in seinem Ventilsitz 66, so daß das Ventil 20 im geschlossenen Zustand bleibt. In dieser Phase wirken die Federn 68, 70 des Aktors 22 gegenläufig, und es ergibt sich eine verminderte Federkraft. Durch diese geringe effektive Federkraft, die geringe bewegte Masse (es bewegt sich nur der erste Ventilkörper 60) und den geringen Hub wird eine geringe Schaltzeit ermöglicht. Dies ist besonders für eine Voreinspritzung von Vorteil. Die zweite Schaltstellung wird eingenommen, indem der Aktor 22 mit einer höheren Steuerspannung angesteuert wird. Damit wird zusätzlich der Hub (h2) durchlaufen, und der Ventilsitz 66 des Ventils 20 schaltet ebenfalls auf Durchfluß. Die Führung 80 des ersten Ventilkörpers 60 liegt außerhalb des zweiten Ventilkörpers 62.In the first switching position, which is taken by the control with a low switching voltage, only the small stroke (h1) is passed through until the first valve body 60 abuts against a second valve body 62. It moves only the first valve body 60, so that a flow occurs at the valve seat 64 of the valve 18. The second valve body 62 remains in its valve seat 66, so that the valve 20 remains in the closed state. In this phase, the springs 68, 70 of the actuator 22 counteract, and there is a reduced spring force. This low effective spring force, the low moving mass (it moves only the first valve body 60) and the small stroke allows a short switching time. This is particularly advantageous for a pilot injection. The second switching position is occupied by the actuator 22 is driven with a higher control voltage. Thus, in addition, the stroke (h2) is passed through, and the valve seat 66 of the valve 20 also switches to flow. The guide 80 of the first valve body 60 is located outside of the second valve body 62.

Für die Erfindung kann es sich als besonders vorteilhaft erweisen, daß der Ventilkolben 60 gegenüber dem Ventilkörper 62 ein gewisses Spiel aufweisen darf. Dies ermöglicht eine zweiteilige und damit einfachere Fertigung des die Ventile 18, 20 darstellenden Doppelventils.For the invention, it may prove to be particularly advantageous that the valve piston 60 relative to the valve body 62 may have a certain amount of play. This allows a two-part and thus simpler manufacturing of the valves 18, 20 performing double valve.

Die vorhergehende Beschreibung der Ausführungsbeispiele gemäß der vorliegenden Erfindung dient nur zu illustrativen Zwecken und nicht zum Zwecke der Beschränkung der Erfindung. Im Rahmen der Erfindung sind verschiedene Änderungen und Modifikationen möglich, ohne den Umfang der Erfindung sowie ihre Äquivalente zu verlassen.The foregoing description of the embodiments according to the present invention is for illustrative purposes only, and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents.

Claims (22)

  1. Injection device with an injection nozzle (12), with a pressure intensifier (16) for intensifying a primary pressure, and with a valve device (18; 20) for actuating the pressure intensifier (16) and the injection nozzle (12), the valve device having at least one first 2/2-way valve (18) and one second 2/2-way valve (20) which are actuated by a common actuating element (22) via a common hydraulic coupling space (24), characterized in that the first 2/2-way valve (18) actuates the injection nozzle (12) via a control space (44) and the second 2/2-way valve (20) actuates the pressure intensifier (16) via a back space (46).
  2. Injection device according to Claim 1, characterized in that the primary pressure is made available by a common rail (26).
  3. Injection device according to one of the preceding claims, characterized in that it is stroke-controlled.
  4. Injection device according to one of the preceding claims, characterized in that the first 2/2-way valve (18), in a first state, decouples the control space (44) for stroke control from a return system (34), and in that the first 2/2-way valve (18), in a second state, couples the control space (44) for stroke control to the return system (34).
  5. Injection device according to one of the preceding claims, characterized in that the second 2/2-way valve (20), in a first state, separates the back space (46) of the pressure intensifier (16) from a return system (34), and in that the second 2/2-way valve (20), in a second state, couples the back space (46) of the pressure intensifier (16) to the return system (34).
  6. Injection device according to one of the preceding claims, characterized in that the two 2/2-way valves (18, 20) are coordinated with one another in such a way that, as a result of a partial actuation of the actuating element (22), one 2/2-way valve (18, 20) can be transferred out of its first state into its second state, and, as a result of a further actuation of the actuating element (22), the other 2/2-way valve (18, 20) can thereupon be transferred out of its first state into its second state.
  7. Injection device according to one of Claims 4 to 6, characterized in that a control space (44) for stroke control is connected to the first 2/2-way valve (18) via a first throttle (54), and in that the control space (44) for stroke control is connected to the supply region of the injection nozzle (12) via a second throttle (52).
  8. Injection device according to one of the preceding claims, characterized in that a working-pressure space (32) of the pressure intensifier (16) is connected to a high-pressure space (36) of the pressure intensifier (16) via a non-return valve (38), via which the high-pressure space (36) can be filled.
  9. Injection device according to one of the preceding claims, characterized in that the supply region of the injection nozzle (12) is connected to a pressure accumulator (26) via a non-return valve (38).
  10. Injection device according to one of the preceding claims, characterized in that a back space (46) of the pressure intensifier (16) can be filled from the working-pressure space (32).
  11. Injection device according to one of the preceding claims, characterized in that the actuating element is a piezoelectric actuator (22).
  12. Injection device according to one of Claims 1 to 11, characterized in that the actuating element and the valve device are implemented by a solenoid valve having two valve bodies (60, 62), a first valve body (60) with a valve-sealing seat (64) and a second valve body (62) with a valve-sealing seat (66) being arranged coaxially one in the other.
  13. Injection device according to Claim 12, characterized in that the first valve body (60) is connected to the actuating element by means of a connecting member which is located within the second valve body (62).
  14. Injection device according to Claim 12 or 13, characterized in that the guide (80) of the first valve body (60) lies outside the second valve body.
  15. Method for the injection of fluid, in which an actuating element (22) is activated, a valve device (18, 20) is actuated by the actuating element (22), a pressure intensifier (16) for intensifying a primary pressure is actuated by the valve device (18, 20), and an injection nozzle (12) is actuated by the valve device (18, 20), a first 2/2-way valve (18) and a second 2/2-way valve (20) of the valve device (18, 20) being actuated by a common actuating element (22) via a common hydraulic coupling space (24), characterized in that the first 2/2-way valve (18) actuates the injection nozzle and the second 2/2-way valve (20) actuates the pressure intensifier, and in that an injection with low pressure takes place as a result of the opening of the first 2/2-way valve (18), and an injection with a pressure rise takes place as a result of the opening of the second 2/2-way valve (20).
  16. Method according to Claim 15, characterized in that the actuation of the first 2/2-way valve (18) is used for preinjection.
  17. Method according to Claim 15 or 16, characterized in that the opening of one of the 2/2-way valves (18, 20) is brought about by a lower stroke of the actuating element (22) than the opening of the other of the 2/2-way valves (18, 20).
  18. Method according to one of Claims 15 to 17,
    characterized in that, as a result of the actuation of the actuating element (22), a control space (44) is relieved, so that the injection nozzle (12) opens and there is an injection phase at low pressure, thereupon, as a result of the further actuation of the actuating element (22), a back space (46) of the pressure intensifier (16) is connected to a return system (34) as a result of the opening of the second 2/2-way valve (20), thereupon a pressure intensification by means of the pressure intensifier (16) occurs, so that an injection phase at high pressure takes place, and thereupon, as a result of the resetting of the actuating element (22), the first 2/2-way valve (18) and the second 2/2-way valve (20) close, so that injection is terminated.
  19. Method according to one of Claims 15 to 18,
    characterized in that, as a result of the actuation of the actuating element (22), a back space (46) of the pressure intensifier (16) is connected to a return system (34) as a result of the opening of the second 2/2-way valve (20), and pressure intensification by means of the pressure intensifier (16) occurs, and in that, as a result of the further actuation of the actuating element (22), a control space (44) is relieved, so that the injection nozzle (12) opens and there is an injection phase at high pressure.
  20. Method according to one of Claims 15 to 19, characterized in that a high-pressure space (36) of the pressure intensifier (16) is filled via a non-return valve (38), via which the said high-pressure space is connected to a working-pressure space (32) of the pressure intensifier (16).
  21. Method according to one of Claims 15 to 20,
    characterized in that the back space (46) of the pressure intensifier (16) is filled from the working-pressure space (32) of the pressure intensifier (16).
  22. Method according to one of Claims 15 to 21,
    characterized in that injection-profile forming is carried out by means of the time profile of the activation of the actuating element (22) and/or by means of the design of the valve-switching forces.
EP01911336A 2000-01-20 2001-01-11 Injection device and method for injecting a fluid Expired - Lifetime EP1252436B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10002272 2000-01-20
DE10002272 2000-01-20
DE10008268A DE10008268A1 (en) 2000-01-20 2000-02-23 Fuel injection device for internal combustion engine, with at least two valves operable by actuator
DE10008268 2000-02-23
PCT/DE2001/000080 WO2001053696A2 (en) 2000-01-20 2001-01-11 Injection device and method for injecting a fluid

Publications (2)

Publication Number Publication Date
EP1252436A2 EP1252436A2 (en) 2002-10-30
EP1252436B1 true EP1252436B1 (en) 2006-05-17

Family

ID=26003938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01911336A Expired - Lifetime EP1252436B1 (en) 2000-01-20 2001-01-11 Injection device and method for injecting a fluid

Country Status (7)

Country Link
US (1) US20030089802A1 (en)
EP (1) EP1252436B1 (en)
JP (1) JP2003520331A (en)
AT (1) ATE326630T1 (en)
CZ (1) CZ20022394A3 (en)
DE (1) DE50109811D1 (en)
WO (1) WO2001053696A2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6568369B1 (en) 2000-12-05 2003-05-27 Caterpillar Inc Common rail injector with separately controlled pilot and main injection
DE10141110A1 (en) * 2001-08-22 2003-03-20 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE10213659A1 (en) * 2002-03-27 2003-10-16 Bosch Gmbh Robert Injection device and method for injecting fluid
DE10237585A1 (en) * 2002-08-16 2004-02-26 Robert Bosch Gmbh Fuel injection installation for IC engine with fuel high pressure pump coupled to fuel injection valve for each engine cylinder, whose engine stroke drives pump piston defining pump work chamber
DE10334771A1 (en) * 2003-07-30 2005-02-24 Robert Bosch Gmbh Pressure-equalizing valve for a fuel injector with pressure booster
DE102004010760A1 (en) * 2004-03-05 2005-09-22 Robert Bosch Gmbh Fuel injection device for internal combustion engines with Nadelhubdämpfung
DE102006062216A1 (en) * 2006-12-22 2008-06-26 Robert Bosch Gmbh fuel injector
US7980224B2 (en) * 2008-02-05 2011-07-19 Caterpillar Inc. Two wire intensified common rail fuel system
DE102010008467A1 (en) * 2010-02-18 2011-08-18 Continental Automotive GmbH, 30165 High pressure fuel injector for an internal combustion engine
CN114151255B (en) * 2021-11-19 2023-02-14 哈尔滨工程大学 Electromagnetic valve direct-drive oil injection-pressurization double-acting oil injector

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129254A (en) * 1977-09-12 1978-12-12 General Motors Corporation Electromagnetic unit fuel injector
US4129256A (en) * 1977-09-12 1978-12-12 General Motors Corporation Electromagnetic unit fuel injector
US4185779A (en) * 1978-01-16 1980-01-29 The Bendix Corporation Fuel injector
US4463900A (en) * 1983-01-12 1984-08-07 General Motors Corporation Electromagnetic unit fuel injector
US4527737A (en) * 1983-09-09 1985-07-09 General Motors Corporation Electromagnetic unit fuel injector with differential valve
US4540122A (en) * 1983-10-26 1985-09-10 General Motors Corporation Electromagnetic unit fuel injector with pivotable armature
US4568021A (en) * 1984-04-02 1986-02-04 General Motors Corporation Electromagnetic unit fuel injector
US4618095A (en) * 1985-07-02 1986-10-21 General Motors Corporation Electromagnetic unit fuel injector with port assist spilldown
KR100203322B1 (en) 1991-10-11 1999-06-15 매리 제이 캘라한 Damped actuator and valve assembly for an electronically controlled unit injector
US5143291A (en) * 1992-03-16 1992-09-01 Navistar International Transportation Corp. Two-stage hydraulic electrically-controlled unit injector
US5669355A (en) * 1994-07-29 1997-09-23 Caterpillar Inc. Hydraulically-actuated fuel injector with direct control needle valve
US5636615A (en) * 1995-02-21 1997-06-10 Diesel Technology Company Fuel pumping and injection systems
US5779149A (en) * 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
US5893516A (en) * 1996-08-06 1999-04-13 Lucas Industries Plc Injector
US5967413A (en) * 1998-02-11 1999-10-19 Caterpillar Inc. Damped solenoid actuated valve and fuel injector using same
US6029628A (en) * 1998-05-07 2000-02-29 Navistar International Transportation Corp. Electric-operated fuel injection having de-coupled supply and drain passages to and from an intensifier piston
DE19951005A1 (en) * 1999-10-22 2001-04-26 Bosch Gmbh Robert Fuel injection unit for motor vehicle engines ha valve unit with two valves operated by piezoactor via common hydraulic chamber

Also Published As

Publication number Publication date
CZ20022394A3 (en) 2004-03-17
WO2001053696A2 (en) 2001-07-26
EP1252436A2 (en) 2002-10-30
JP2003520331A (en) 2003-07-02
WO2001053696A3 (en) 2002-02-14
ATE326630T1 (en) 2006-06-15
US20030089802A1 (en) 2003-05-15
DE50109811D1 (en) 2006-06-22

Similar Documents

Publication Publication Date Title
EP0939857B1 (en) Fuel injection valve
DE102005028866A1 (en) Fuel injection method for engine, involves closing nozzle valve while fuel pressure is maintained above valve opening pressure, and reopening valve for main injection, and reducing fuel pressure in fuel injector
DE2742466A1 (en) PUMP NOZZLE FOR AIR-COMPRESSING INJECTION COMBUSTION MACHINES
EP1593840A2 (en) Method and apparatus for shaping the injection pressure of a fuel injector
WO2004003374A1 (en) Common rail injection system comprising a variable injector and booster device
EP1593839A1 (en) Fuel injector for combustion engines with a multi-stage control valve
EP1252437B1 (en) Injection device and method for injecting a fluid
EP1125054B1 (en) Fuel injection method and device
EP1252436B1 (en) Injection device and method for injecting a fluid
EP0399991B1 (en) Process and device for controlling the movement of a hydraulically actuated valve
DE10008268A1 (en) Fuel injection device for internal combustion engine, with at least two valves operable by actuator
DE102006000278A1 (en) Fuel injection device for an internal combustion engine
WO2005015000A1 (en) Control valve with pressure compensation for a fuel injector comprising a pressure intensifier
WO2004040117A1 (en) Fuel injection system for internal combustion engines
EP1144859B1 (en) Injection device and method for injection of fluids
DE19939452A1 (en) Fuel injection device
DE19752851C1 (en) Hydraulic 2/2-way control valve for automobile fuel injection system
EP1310666A2 (en) Fuel injection system for internal combustion engine
EP1907686B1 (en) Fuel injector
EP1334271A1 (en) Lift and/or pressure-controlled injector with a double slide
WO2005124145A1 (en) Fuel injection device
DE10051343B4 (en) Method for injecting fuel with multiple control of a control valve
EP1488089A1 (en) Method and device for controlling the piezo-actuator of a piezo-control valve of a pump nozzle unit
EP1593838B1 (en) Control method for influencing the opening velocity of a control valve of a fuel injector
EP1472455B1 (en) Method and device for controlling a control valve of a pump-nozzle unit

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20020820

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

17Q First examination report despatched

Effective date: 20050518

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20060517

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060517

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060517

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060517

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060517

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REF Corresponds to:

Ref document number: 50109811

Country of ref document: DE

Date of ref document: 20060622

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060817

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061017

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 20060517

ET Fr: translation filed
REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070131

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070131

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070220

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20070930

BERE Be: lapsed

Owner name: ROBERT BOSCH G.M.B.H.

Effective date: 20070131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070131

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070504

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070131

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060818

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070111

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080111

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060517

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070111

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060517

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20150324

Year of fee payment: 15

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50109811

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160802