EP1252436B1 - Systeme d'injection et procede pour injecter un fluide - Google Patents

Systeme d'injection et procede pour injecter un fluide Download PDF

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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
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German (de)
English (en)
Other versions
EP1252436A2 (fr
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
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Filing date
Publication date
Priority claimed from DE10008268A external-priority patent/DE10008268A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1252436A2 publication Critical patent/EP1252436A2/fr
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Publication of EP1252436B1 publication Critical patent/EP1252436B1/fr
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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.

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

Claims (22)

  1. Dispositif d'injection avec une buse d'injection (12), un amplificateur de pression (16) pour amplifier une pression primaire, un dispositif de soupapes (18 ; 20) pour actionner l'amplificateur de pression (16) et la buse d'injection (12), le dispositif de soupapes présentant une première soupape 2/2 (18) et une deuxième soupape 2/2 (20), actionnées par un élément de réglage (22) commun par l'intermédiaire d'une chambre de couplage (24) hydraulique commune,
    caractérisé en ce que
    la première soupape 2/2 (18) actionne la buse d'injection (12) par l'intermédiaire d'une chambre de commande (44) et la deuxième soupape 2/2 (20) actionne l'amplificateur de pression (16) par l'intermédiaire d'une chambre de retour (46).
  2. Dispositif d'injection selon la revendication 1,
    caractérisé en ce que
    la pression primaire est fournie par une rampe commune (26).
  3. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    il est à commande linéaire.
  4. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la première soupape 2/2 (18), dans un premier état, découple la chambre de commande (44) d'un système de reflux (34) pour une commande linéaire, et la première soupape 2/2 (18), dans un deuxième état, accouple la chambre de commande (44) au système de reflux (34) pour la commande linéaire.
  5. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la deuxième soupape 2/2 (20), dans un premier état, sépare la chambre de retour (46) de l'amplificateur de pression (16) d'un système de reflux (34), et la deuxième soupape 2/2 (20), dans un deuxième état, accouple la chambre de retour (46) de l'amplificateur de pression (16) au système de reflux (34).
  6. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les deux soupapes 2/2 (18, 20) sont adaptées l'une à l'autre de sorte à pouvoir transférer, par actionnement partiel de l'élément de réglage (22), une soupape 2/2 (18, 20) de son premier état dans son deuxième état puis, par un nouvel actionnement de l'élément de réglage (22), l'autre soupape 2/2 (18, 20) de son premier état dans son deuxième état.
  7. Dispositif d'injection selon l'une quelconque des revendications 4 à 7,
    caractérisé en ce que
    pour la commande de course une chambre de commande (44) est reliée par un premier étrangleur (54) à la première soupape 2/2 (18), et pour la commande linéaire la chambre de commande (44) est reliée par un deuxième étrangleur (52) à la zone d'alimentation de la buse d'injection (12).
  8. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    une chambre de pression de travail (32) de l'amplificateur de pression (16) est reliée à une chambre haute pression (36) de l'amplificateur de pression (16) par un clapet anti-retour (38) qui permet de remplir la chambre haute pression (36).
  9. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la zone d'alimentation de la buse d'injection (12) est reliée par un clapet anti-retour (38) à un accumulateur de pression (26).
  10. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    une chambre de retour (46) de l'amplificateur de pression (16) peut être remplie depuis la chambre de pression de travail (32).
  11. Dispositif d'injection selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément de réglage est un actionneur piézoélectrique (22).
  12. Dispositif d'injection selon l'une quelconque des revendications 1 à 11,
    caractérisé en ce que
    l'élément de réglage et le dispositif de soupapes sont réalisés sous la forme d'une soupape magnétique avec deux corps de soupape (60, 62) dont un premier corps de soupape (60) muni d'un siège d'étanchéité de soupape (64) et un deuxième corps de soupape (62) muni d'un siège d'étanchéité de soupape (66) sont disposés coaxialement l'un dans l'autre.
  13. Dispositif d'injection selon la revendication 13,
    caractérisé en ce que
    le premier corps de soupape (60) est relié à l'élément de réglage par un organe de jonction situé à l'intérieur du deuxième corps de soupape (62).
  14. Dispositif d'injection selon la revendication 13 ou 14,
    caractérisé en ce que
    le guidage (80) du premier corps de soupape (60) se situe à l'extérieur du deuxième corps de soupape.
  15. Procédé d'injection d'un fluide, selon lequel on active un élément de réglage (22) qui actionne, un dispositif de soupapes (18, 20), un amplificateur de pression (16) est actionné par le dispositif de soupapes (18, 20) pour amplifier une pression primaire, une première soupape 2/2 (18) et une deuxième soupape 2/2 (20) du dispositif de soupapes (18, 20) étant actionnées par élément de réglage (22) commun par l'intermédiaire d'une chambre de couplage (24) hydraulique commune,
    caractérisé en ce que
    la première soupape 2/2 (18) actionne la buse d'injection et la deuxième soupape 2/2 (20) l'amplificateur de pression, et
    l'ouverture de la première soupape 2/2 (18) effectue une injection à une faible pression et l'ouverture de la deuxième soupape 2/2 (20) une injection à une pression plus haute.
  16. Procédé selon la revendication 15,
    caractérisé en ce que
    l'actionnement de la première soupape 2/2 (18) est utilisé pour la pré-injection.
  17. Procédé selon la revendication 15 ou 16,
    caractérisé en ce que
    l'ouverture de l'une des soupapes 2/2 (18, 20) est obtenue par une course plus réduite de l'élément de réglage (22) que l'ouverture de l'autre des soupapes 2/2 (18, 20).
  18. Procédé selon l'une quelconque des revendications 15 à 17,
    caractérisé en ce que
    l'actionnement de l'élément de réglage (22) décharge une chambre de commande (44), la buse d'injection (12) s'ouvre et on a une phase d'injection à faible pression, puis un autre actionnement de l'élément de réglage (22) relie une chambre de retour (46) de l'amplificateur de pression (16) à un système de reflux (34) par l'ouverture de la deuxième soupape 2/2 (20), puis une amplification de pression s'effectue par l'amplificateur de pression (16), pour ainsi avoir une phase d'injection à haute pression, puis par le retour de l'élément de réglage (22) la première soupape 2/2 (18) et la deuxième soupape 2/2 (20) se ferment et l'injection est terminée.
  19. Procédé selon l'une quelconque des revendications 15 à 18,
    caractérisé en ce que
    l'actionnement de l'élément de réglage (22) relie une chambre de retour (46) de l'amplificateur de pression (16) à un système de reflux (34) par l'ouverture de la deuxième soupape 2/2 (20), et une amplification de pression s'effectue par l'amplificateur de pression (16), et un autre actionnement de l'élément de réglage (22) décharge une chambre de commande (44), la buse d'injection (12) s'ouvre et on a une phase d'injection à haute pression.
  20. Procédé selon l'une quelconque des revendications 15 à 19,
    caractérisé en ce qu'
    une chambre haute pression (36) de l'amplificateur de pression (16) est remplie par l'intermédiaire d'un clapet anti-retour (38) qui la relie à une chambre de pression de travail (32) de l'amplificateur de pression (16).
  21. Procédé selon l'une quelconque des revendications 15 à 20,
    caractérisé en ce que
    la chambre de retour (46) de l'amplificateur de pression (16) est remplie à partir de la chambre de pression de travail (32) de l'amplificateur de pression (16).
  22. Procédé selon l'une quelconque des revendications 15 à 22,
    caractérisé en ce qu'
    on forme une courbe d'injection par l'évolution dans le temps de la commande de l'élément de réglage (22) et/ou par l'expression des forces de commutation des soupapes.
EP01911336A 2000-01-20 2001-01-11 Systeme d'injection et procede pour injecter un fluide Expired - Lifetime EP1252436B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10002272 2000-01-20
DE10002272 2000-01-20
DE10008268A DE10008268A1 (de) 2000-01-20 2000-02-23 Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
DE10008268 2000-02-23
PCT/DE2001/000080 WO2001053696A2 (fr) 2000-01-20 2001-01-11 Systeme d'injection et procede pour injecter un fluide

Publications (2)

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

Family

ID=26003938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01911336A Expired - Lifetime EP1252436B1 (fr) 2000-01-20 2001-01-11 Systeme d'injection et procede pour injecter un fluide

Country Status (7)

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

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US6568369B1 (en) 2000-12-05 2003-05-27 Caterpillar Inc Common rail injector with separately controlled pilot and main injection
DE10141110A1 (de) * 2001-08-22 2003-03-20 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE10213659A1 (de) * 2002-03-27 2003-10-16 Bosch Gmbh Robert Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid
DE10237585A1 (de) * 2002-08-16 2004-02-26 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10334771A1 (de) * 2003-07-30 2005-02-24 Robert Bosch Gmbh Schaltventil mit Druckausgleich für einen Kraftstoffinjektor mit Druckverstärker
DE102004010760A1 (de) * 2004-03-05 2005-09-22 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit Nadelhubdämpfung
DE102006062216A1 (de) * 2006-12-22 2008-06-26 Robert Bosch Gmbh Kraftstoffinjektor
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CN114151255B (zh) * 2021-11-19 2023-02-14 哈尔滨工程大学 电磁阀直驱喷油-增压双作用喷油器

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Also Published As

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

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