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 with an injection nozzle, a pressure booster for increasing a primary pressure, a valve device for actuating the pressure booster and an actuating element for actuating the valve device.
• the invention further relates to a method for injecting fluid, in which an actuating element is activated, a valve device is actuated by the actuating element, a pressure booster for increasing a primary pressure is actuated by the valve device and an injection nozzle is opened.
• a generic device and a generic method are known for example from EP 0 562 046 B1.
• the basic requirement for such a system is to carry out the fuel injection with the greatest possible injection pressure.
• a high injection pressure has a positive influence on the function of an engine; for example, pollutant emissions and fuel consumption are reduced.
• a pressure booster is provided, which, by means of a hydraulic transmission, has a primary pressure, for example of a pressure Storage available pressure converts into the desired high injection pressure.
• a suitable pressure increase can be set by the suitable choice of the areas to which force is applied and the counterforces of elastic means.
• the pressure booster and the injection nozzle can be controlled in such a way that two 2/2-way valves are provided, each of which is controlled by two separate control elements. Separate control electronics must be provided for each control element. By suitably coordinating the control electronics, switching sequences can be achieved with which different injection processes can be implemented.
• the apparatus solution described is complex.
• Generic pressure intensification is particularly useful in connection with a common rail system.
• the common rail accumulator injection With the common rail accumulator injection, the primary pressure generation and the injection are decoupled.
• the injection pressure is generated independently of the engine speed and the injection quantity and made available for injection in the "rail" (fuel accumulator).
• the pressure in the common rail is currently still limited to approx. 1600 bar, so that an increase in pressure is desirable for reasons of emissions and fuel consumption.
• Pressure boosters with a transmission ratio of 1: 7 are currently known. A pressure booster in combination with a common rail system could therefore deliver particularly good results.
• the injection device according to the invention is based on the prior art in that the valve device has at least a first 2/2 valve and a second 2/2 valve which can be actuated by the actuating element. Since the two 2/2 valves can be actuated by the same control element, the outlay on equipment is reduced at this point compared to the use of two separate valve controls, so that there is an overall improvement in the system.
• the first 2/2 valve and the second 2/2 valve can preferably be actuated by the actuating element via a common hydraulic coupling space.
• This measure also advantageously makes it possible to reduce the outlay in terms of apparatus for using two valves.
• a single coupling space is sufficient since the 2/2 valves can be matched to one another in a suitable manner.
• the hydraulic coupling space can also be a force-displacement translation and the compensation of tolerances, e.g. Changes in location serve.
• the primary pressure is preferably provided by a common rail. It is thus possible to combine the advantages of a common rail system with the pressure-boosted injection device.
• the common rail pressure which is currently limited to approx. 1600 bar, can be increased in pressure; thus emissions and fuel consumption are reduced. It is particularly advantageous if the injection system is stroke-controlled. There is thus a control chamber, via the relief of which the injector can be opened. "In this way it is possible to open the injector at a comparatively low pressure in the supply area of the injector, and thus an injection - for example a pre-injection - with little To carry out printing, for example with rail printing.
• the first 2/2 valve In a first state, the first 2/2 valve preferably closes a control chamber for stroke control, and the first 2/2 valve opens the control chamber for stroke control in a second state. An actuation of the first 2/2 valve is therefore sufficient to initiate an injection.
• the second 2/2 valve In a first state, the second 2/2 valve preferably separates a jerk space of the pressure booster from a return system, and the second 2/2 valve couples the jerk space of the pressure booster with the return system in a second state.
• the jerk space thus represents a control space for the pressure booster.
• the first 2/2-valve and the second 2/2-valve are matched to one another in such a way that the first 2/2-valve is activated by partially actuating the actuating element can be transferred from its first state to its second state and the second 2/2-valve can then be transferred from its first state to its second state by further actuation of the actuating element.
• the stroke control provided by the first 2/2 valve can be used for a pre-injection at low rail pressure, while the actuation of the first valve with subsequent actuation of the second 2/2 valve is used for a main injection with increased pressure: ,
• a separate control of the injection nozzle (stroke control) and the pressure build-up by the pressure booster is thus possible. This allows a varied shaping of the injection pressure curve.
• a control chamber for the stroke control is advantageously connected to the first 2/2 valve via a first throttle, and the control chamber for the stroke control is connected to the supply area of the injection nozzle via a second throttle.
• the opening speed of the nozzle needle in stroke-controlled injection can be determined by the flow difference of these throttles.
• a working pressure chamber of the pressure booster is preferably connected to a high pressure chamber of the pressure booster via a non-return valve, via which the high pressure chamber is available.
• a non-return valve via which the high pressure chamber is available.
• a check valve prevents the high pressure from reaching the high pressure chamber of the pressure booster into the working pressure chamber of the pressure booster; on the other hand, the check valve enables the high pressure chamber to be filled from the working pressure chamber.
• a throttle connected in series is advantageously provided. This measure creates a pressure difference between the working pressure chamber and the high pressure chamber in the event of an undesired, increased leakage flow in the injector, for example by needle clamps.
• a working pressure chamber of the pressure booster is preferably connected via a non-return valve to a pressure chamber of the pressure booster, via which the pressure chamber can be relieved.
• the pressure booster piston assumes its maximum stroke when there is 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 the event of damage.
• a jerk space of the pressure booster can be filled from the working pressure space. This can be done using a choke, for example. A sudden increase in pressure in the back space is not permitted due to the throttle. However, it is possible to fill the back space via the throttle, so that the booster is ready for the next injection process.
• the actuating 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 enlargement of the control room.
• the actuating element is arranged between the first 2/2 valve and the second 2/2 valve.
• the adjusting element can be arranged such that its movement is perpendicular to the longitudinal extension of the injection device. This also has advantages in With regard to minimizing the volume of the control room of the stroke control and also the pressure booster.
• actuating element is arranged above the valve device and pressure booster. This variant offers the possibility of a very compact design.
• the control element is preferably a piezo actuator.
• Piezo actuators have proven themselves as electronically controllable control elements, especially since their structure is compact and they work reliably. Furthermore, the actuating function can be changed by changing the parameters (voltage, pulse duration) of the control.
• control element and the valve device are realized by a solenoid valve with two valve bodies, a first valve body with a valve sealing seat and a second valve body with a valve sealing seat being arranged coaxially one inside the other.
• first valve body is connected to the actuating element by a connecting member that is located within the second valve body. It is particularly preferred that the guidance of the first valve body lies outside the second valve body.
• the invention is therefore not limited to the use of a piezo actuator. Rather, a compact and reliable variant can also be implemented on the basis of the specified embodiments with a solenoid valve.
• the invention builds on the generic method according to claim 16 in that a first 2/2 valve and a second 2/2 valve of the valve device are actuated by the actuating element. Only a single control element and its preferably electronic control is required. loaned to operate both the first 2/2 valve and the second 2/2 valve.
• first 2/2 valve and the second 2/2 valve are actuated by the actuating element via a common hydraulic coupling space.
• the method according to the invention can be designed in a simple manner.
• opening the first 2/2 valve causes low pressure injection
• opening the second 2/2 valve causes higher pressure injection
• the actuation of the first 2/2 valve is preferably used for the pre-injection.
• An injection can thus be carried out with low pressure and a small injection quantity.
• a first valve is opened by partially actuating the actuating element, pre-injection starting at low pressure and then closing the first valve by resetting the actuating element, so that the injection is stopped.
• the method according to the invention is particularly advantageous in that a control chamber is relieved by partial actuation of the control element, so that the injection nozzle opens and an injection phase begins at low pressure, and then by further actuation of the control element, a pressure intensifier jerk space with a return system by opening the second 2/2 valve is connected, there is then a pressure increase in the injection pressure by the pressure booster, so that now an injection phase takes place at high pressure and then close the first 2/2 valve and the second 2/2 valve by resetting the control element so that the injection is ended.
• a single actuating element communicates with two 2/2 valves via preferably a single coupling space.
• the advantages of a stroke-controlled pre-injection are combined with the advantages of an increasing pressure curve during the main injection. It can also be useful that by actuating the actuating element, a pressure intensifier's back space is connected to a return flow system by opening the second 2/2 valve and the pressure intensifier is increasing pressure, and by further actuating the actuating element, a control space is relieved, so that the injector opens and there is an injection phase at high pressure.
• post-injection can advantageously take place at a high pressure level: by downshifting from the second switching position to the first switching position only the injector is closed, while the booster remains active. Switching to the second switching position again opens the injector for post-injection at high pressure.
• the high pressure chamber of the pressure booster is preferably filled via a check valve, via which it is connected to the working pressure chamber. Since there is a sufficient fluid reservoir in the working pressure chamber, it is useful to use this to fill the high pressure chamber via a check valve. Conversely, the high pressure from the high-pressure chamber cannot exceed the working pressure chamber of the pressure booster through the check valve; the pressure is fully used to control the injector.
• a jerk space of the pressure booster is preferably filled from the working pressure space of the pressure booster. This can be done using a choke, for example.
• the throttle thus permits filling and thus provision of the pressure booster for the next injection process; however, it avoids an undesired transmission of a rapid pressure change from the working pressure chamber of the pressure booster into the jerk chamber.
• the method is particularly advantageous if the course of the actuation of the control element and / or the design of the valve switching forces is used to shape the course of an injection.
• the system thus offers numerous possible variations, which can either be permanently installed through the design of the components or can also be changed in the process by controlling the control element.
• the invention is characterized in particular by the fact that by using two 2/2 valves which are actuated by a common actuating element via a common coupling space, an injection device with pressure booster can be controlled in a reliable manner. It is therefore no longer necessary to provide separate electronic and hydraulic controls for the pressure booster and the injector. This results in an advantageous reduction in the expenditure on equipment.
• the advantages of a stroke-controlled pre-injection can advantageously be combined with the advantages of an increasing pressure curve in the main injection.
• 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
• Figure 4 shows a hydraulic circuit diagram with important system components
• Figure 5 shows a fourth embodiment of an injection device according to the invention. Description of the exemplary embodiments
• FIG. 1 shows a first embodiment of an injection device 10 according to the invention.
• An injection nozzle 12 is used to inject fuel into the combustion chamber of an engine, in particular a diesel engine.
• the injector 12 is provided with fuel at a pressure from a pressure booster 16.
• the injection nozzle 12 is controlled 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 piezo actuator 22 via a common hydraulic coupling space 24.
• a pressure builds up in a control chamber 44, which in the normal case corresponds to the pressure of a pressure accumulator (common rail) 26; this provides the primary pressure for injector 10.
• the pressure in the control chamber 44 exerts a closing force on the injection nozzle 12, as a result of which the injection nozzle is closed.
• the control chamber 44 is relieved, the closing force is reduced, and the injection nozzle 12 can open by this stroke control.
• the second 2/2 valve 20 blocks a connection between the return system 34 of the injection device and a pressure chamber 46 of the pressure booster 16. If the second 2/2 valve 20 opens, the pressure in the pressure chamber 46 can be relieved and thus pressure can be increased by the pressure booster 16.
• the working pressure chamber 32 and the high pressure chamber 36 of the pressure booster 16 are connected to one another via a check valve 38 and a throttle 56.
• the high-pressure chamber 36 can thus be released from the working pressure chamber 32 via the check valve 38 in preparation for the next pressure drop. Refill the fill while the throttle 56 prevents the fill path from acting as a bypass upon injection.
• a further non-return valve 48 is provided, via which the working pressure chamber 32 is connected to the non-return chamber 4 "6 of the pressure booster 16. The non-return valve 48 prevents the build-up of overpressure in the pressure chamber 46 of the pressure booster.
• a throttle 50 connected in parallel with the non-return valve 48 permits refilling of the jerk chamber 46, but avoids an undesirable sudden pressure transfer between the working pressure chamber 32 and the jerk chamber 46.
• two further throttles 52, 54 are provided as the inlet throttle 52 and the outlet throttle 54 of the control chamber 44. It is intended to note that, in particular, the check valve 48 and the throttle 56 bring considerable advantages with regard to the intrinsic safety of the system, but in principle need not be decisive for the functionality of the system.
• the injection device 10 can be operated, for example, in such a way that the piezo actuator 22 is first activated in such a way that only a small stroke (partial stroke) takes place. This stroke is selected so that the first 2/2 valve 18 opens, but the second 2/2 valve 20 remains closed.
• the control chamber 44 is relieved via the throttle 54, and the injection nozzle 12 is stroke-controlled opened.
• 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 on the injection nozzle 12.
• a larger stroke of the piezo actuator 22 then takes place, so that the second 2/2 valve 20 also opens.
• the high pressure space 36 of the pressure booster 16 is filled via the throttle 56 and the check valve 38 from the working pressure space 32 of the pressure booster 16.
• the activation of the first 2/2-valve 18 with a small stroke of the piezo actuator 22 can therefore be used in an advantageous manner for pre-injection with low pressure.
• the piezo actuator 22 is arranged on the side of the injection device 10. In this way, a 180 ° arrangement can be selected for the first 2/2 valve 18 and the second 2/2 valve 20. Such an arrangement has advantages with regard to minimizing the volumes of the effective control chamber for the stroke control and of the pressure booster 16. Components which correspond to those in FIG. 1 are identified by the same reference symbols.
• FIG. 1 A hydraulic circuit diagram is shown in FIG. To generate the system pressure, e.g. B. a quantity-controlled system pressure, e.g. B. a quantity-controlled system pressure, e.g. B. a quantity-controlled system pressure, e.g. B.
• High pressure pump used.
• the fuel is compressed to a controllable first system pressure of approximately 300 bar to approximately 1500 bar and stored in a pressure accumulator (common rail) 26.
• the injection is controlled by needle stroke control via the valve 18, which is shown schematically by its various switching states.
• the pressure booster 16 is controlled by a 2/2 valve 20, which is also shown schematically by its various switching states.
• a bypass with a check valve 38 is available for refilling the high-pressure chamber 36 of the pressure booster 16.
• injections with different pressures can take place with the arrangement shown. If the valve 20 is closed, the entire injector 14 is under rail pressure; the pressure booster 16 is in its initial position. By actuating (stroke control) the injector 12 with the valve 18, injection with rail pressure can take place as in a common rail system of the prior art. If an injection is to take place with an increased injection pressure, the valve 20 is activated. The pressure booster 16 is thus actuated.
• valves 18, 20 are controlled by the same actuator 22.
• the actuator 22 has three positions - a rest position and two switch positions. Taking the different different positions is achieved by varying the actuation of the actuator 22.
• both valves 18, 20 have no flow, the rail pressure is applied to the injector 14 via the bypass path with the check valve 38.
• the injection nozzle 12 is closed due to the pressure in the control chamber 44, the pressure booster 16 is in its starting position.
• both valves 18, 22 are switched to flow.
• both the control chamber 44 of the injector 14 and the jerk chamber 46 of the pressure booster 16 are relieved.
• the rail pressure is increased by the pressure booster, and an injection with increased injection pressure takes place.
• the system is first brought into the first switching position (S1) and then after a certain delay in the second switching position (S2), there is a boot injection.
• FIG. 4 Another embodiment of the invention is shown in FIG. 4 on the right side (b).
• the rest position (RS) corresponds to that in the exemplary embodiment, which is shown on the left (a).
• both valves 18, 20 are opened, so that the injector 14 is also activated.
• post-injection can advantageously take place at a high pressure level: by downshifting from the second switching position (S2) to the first switching position (S1), only the injection nozzle 12 is closed, the pressure booster 16 remaining active. Switching again to the second switching position (S2) then opens the injector 12 for post-injection at high pressure.
• FIG. A three-stage magnetic actuator is provided as the actuator 22.
• the valves 18, 20 are arranged coaxially.
• the first switching position which is assumed by the control with a low switching voltage, only the small stroke (hl) is run through until the first valve body 60 strikes a second valve body 62. Moving only the first valve body 60 so that there is a flow 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 act in opposite directions, and the spring force is reduced.
• This low effective spring force, the low moving mass (only the first valve body 60 moves) and the short stroke enable a short switching time. This is particularly advantageous for a pre-injection.
• the second switching position is assumed by actuating the actuator 22 with a higher control voltage.
• the stroke (h2) is run through, and the valve seat 66 of the valve 20 also switches to flow.
• the guide 80 of the first valve body 60 lies outside the second valve body 62.
• valve piston 60 may have a certain amount of play in relation to the valve body 62. This enables a two-part and thus simpler manufacture of the double valve representing the valves 18, 20.

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• Engineering & Computer Science (AREA)
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• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Fluid Mechanics (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)

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• 2001
  • 2001-01-11 DE DE50109811T patent/DE50109811D1/de not_active Expired - Lifetime
  • 2001-01-11 US US10/181,695 patent/US20030089802A1/en not_active Abandoned
  • 2001-01-11 JP JP2001553532A patent/JP2003520331A/ja active Pending
  • 2001-01-11 WO PCT/DE2001/000080 patent/WO2001053696A2/fr active IP Right Grant
  • 2001-01-11 CZ CZ20022394A patent/CZ20022394A3/cs unknown
  • 2001-01-11 AT AT01911336T patent/ATE326630T1/de not_active IP Right Cessation
  • 2001-01-11 EP EP01911336A patent/EP1252436B1/fr not_active Expired - Lifetime

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