• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In an apparatus for injecting fuel into the combustion chamber of an internal combustion engine, at least one injector (1) is provided, which comprises a high-pressure accumulator (6) integrated in the injector body, an injection nozzle (2) which comprises an axially displaceable nozzle needle (15), which a nozzle chamber (19) is surrounded, a high-pressure accumulator (6) with the injection nozzle (2) connecting the high pressure bore (8) and a parallel to the high pressure bore (8) connected resonator bore (20) which communicates with the injection nozzle (2) and via a resonator (21) opens into the high-pressure accumulator (6). The high-pressure bore (8) comprises a first section (8 ') adjoining the high-pressure accumulator (6) and a second section (8' ') opening into the injection nozzle (2), the first section (8') having a larger flow cross-section has as the second portion (8 ") •
    公开号:AT512439A1
    申请号:T1042012
    申请日:2012-01-26
    公开日:2013-08-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    The invention relates to a device for injecting fuel into the combustion chamber of an internal combustion engine having at least one injector, which includes a high-pressure accumulator integrated in the injector body, an injection nozzle which comprises an axially displaceable nozzle needle, which is surrounded by a nozzle chamber, a high-pressure accumulator with the injection nozzle connecting high-pressure bore and a parallel to the high-pressure bore resonator bore comprises, which communicates with the injection nozzle and is connected via a resonator in the high-pressure accumulator.
    Injection injectors of this type are used in modular common rail systems, which are characterized in that a part of the existing storage volume in the system is present in the injector itself. Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other. The sole use of a common rail for all injectors is not useful in such engines, as it would come due to the long lines during injection to a massive slump in Ein-injection pressure, so with prolonged injection duration, the injection rate would noticeably break. In such engines, it is therefore intended to arrange a high-pressure accumulator inside each injector. Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module. Under a high-pressure accumulator is not to be understood a common line, but it is at a high-pressure accumulator to a pressure-resistant vessel with an inlet and outlet, whose diameter compared to the high pressure lines significantly
    is increased, so that from the high-pressure accumulator a certain amount of injection can be delivered without causing an immediate pressure drop.
    In a common rail system, electronically controlled injection injectors are used to inject the fuel into the engine combustion chamber. The servo valves used in these injectors cause a very fast closing of the injector. When closing the injector, the fuel runs against a closed line end, wherein due to the inertia of the fuel, the pressure in front of the injector increases significantly. As a result, this pressure peak reciprocates in the high-pressure bore between the injection nozzle and the high-pressure accumulator, with strong pressure pulsations occurring at the nozzle seat, which lead to excessive wear here. The resulting pressure peaks are in unfavorable cases by up to 500 bar above the rail pressure.
    Moreover, these pressure oscillations lead to strong fluctuations in the injection rate in the case of injection sequences that follow one another rapidly. If, for example, a pressure oscillation at the nozzle seat is induced by a pre-injection, then with a constant opening time of the nozzle needle for the second, subsequent injection, the injected quantity depends on whether the second injection occurred earlier in a maximum or in a minimum of the pressure oscillation. The lowest possible pressure oscillation at the injection nozzle in all operating states of the hydraulic system is therefore desirable.
    One possibility for the reduction of pressure pulsations can be found in WO 2007/143768 A1, wherein a parallel to
    High-pressure line between injection nozzle and high-pressure accumulator switched resonator is provided, the high pressure accumulator side has a resonator. The resonator throttle is preferably arranged at the inlet of the resonator line into the high-pressure accumulator.
    The known from WO 2007/143768 Al training thus provides that the high pressure line is divided into two independent areas, one of which is equipped with a throttle, so that the pressure oscillations that arise at the nozzle seat, are reflected differently in both areas and the reflected vibrations almost cancel each other due to their phase shift.
    Although said resonator system is able to accelerate the decay of the pressure oscillations, the first pressure peak which occurs immediately upon closing of the injection nozzle can not be lowered thereby.
    The invention therefore aims to lower as effectively as possible the first pressure peak occurring directly upon closing of the injection nozzle.
    To achieve this object, the invention essentially provides, proceeding from a device of the type initially mentioned, that the high-pressure bore comprises a first section adjoining the high-pressure accumulator and a second section opening into the injector, wherein the first section has a larger flow cross-section than the second section.
    This simple measure ensures that the fluid column which runs against the closed injection nozzle is reduced and thus the corresponding pressure peak is lowered.
    Preferably, the first and second portions directly adjoin one another. The transition from the larger flow cross section of the first section to the smaller flow cross section of the second section can take place here continuously or stepwise. In a step-like transition, the edge formed at the transition is preferably rounded. Preferably, both the first and the second section has a circular flow cross-section.
    In order to maximize the effect achieved by the construction according to the invention, the first section of the high-pressure bore formed with a larger flow cross-section is formed as long as possible and thus brought as close as possible to the injection nozzle. A preferred development in this context provides that the length of the first section corresponds to at least twice, preferably at least three times, the length of the second section.
    An optimization of the effect achieved by the construction according to the invention can also be achieved by selecting the flow cross section of the first section as large as possible in relation to the flow cross section of the second section. A preferred embodiment provides that the flow cross section of the first section corresponds to at least 1.5 times, preferably at least twice, preferably at least three times, more preferably at least four times, the flow cross section of the second section. * ft * ···············································································. · Ftft «ft
    The inventive design is particularly advantageous for injectors to bear, in which the nozzle needle for controlling its opening and closing movement of the prevailing in a fuel-pressurized control chamber pressure in the axial direction can be acted upon, wherein the control chamber with a inlet throttle having inlet channel and a drain passage having flow channel is in communication and at least one inlet or outlet channel opening or closing control valve is provided with which the pressure in the control chamber is controlled, that the inlet throttle and the outlet throttle are formed in a throttle plate that the control valve in a valve plate is formed and that the high-pressure bore and the resonator bore to pass through the valve plate and the throttle plate. In this case, the injector is usually designed such that an injector and / or holding body accommodating the high-pressure accumulator, the valve plate, the throttle plate and the injection nozzle are held together by a nozzle retaining nut. The high-pressure bore and the resonator bore extend through the holding body, the valve plate and the throttle plate and thereby connect the high-pressure accumulator with the injection nozzle.
    In an injector of the abovementioned type, it is particularly advantageous in the context of the invention for the section of the high-pressure bore passing through the throttle plate and the valve plate to form the second section thereof or a part of the second section. In this section, the flow cross-section is limited by design, as the resonator bore and the high pressure bore on the valve assembly and the drain and possibly 6
    Inlet restrictor must be passed. The first section of the high-pressure bore, however, is preferably formed in a holding body which is arranged between the high-pressure accumulator and the valve plate.
    The transition from the first section into the second section of the high-pressure bore can be arranged, for example, at the transition of the holding body to the valve plate. However, this would mean that at this point, at which the valve plate and the holding body are pressed sealingly against one another, a larger cross-section of the high-pressure bore, namely the cross section of the first section, must be sealed. To avoid this, a preferred development provides that the transition from the first section to the second section of the high-pressure bore is arranged in the holding body. At the transition from the holding body in the valve plate in this case, only the smaller cross section of the second section is sealed.
    It is preferably provided that the resonator throttle is arranged at the inlet of the resonator bore in the high-pressure accumulator.
    The length of the resonator bore is preferably matched to the length of the high-pressure bore so that the pressure oscillations induced by the injector are mutually weakened or extinguished.
    The length of the resonator bore between the injection nozzle and the resonator throttle as well as the length of the high-pressure line between the injection nozzle and the inlet of the high-pressure bore into the pressure accumulator is preferably an integer multiple of the wavelength of the pressure oscillation induced by the injection nozzle.
    The length of the resonator bore between the nozzle front chamber and the resonator throttle preferably corresponds substantially to the length of the high-pressure line between the nozzle front chamber and the inlet of the high-pressure bore into the pressure accumulator.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. 1 schematically shows a cross section of an injector equipped with a high-pressure accumulator according to the prior art, and FIG. 2 shows a schematic representation of the profile of the flow cross-section of the high-pressure line between high-pressure accumulator and injection nozzle.
    In Fig. 1, an injector 1 is shown, which has an injection nozzle 2, a throttle plate 3, a valve plate 4, a holding body 5 and a high-pressure accumulator 6, wherein a bolted to the holding body 5 nozzle retaining nut 7, the injection nozzle 2, the throttle plate 3 and the Valve plate 4 holds together. In the idle state, the solenoid valve 13 is closed, so that high-pressure fuel from the high-pressure accumulator 6 via the high pressure line 8, the cross-connection 9 and the inlet throttle 10 flows into the control chamber 11 of the injection nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but at the valve seat of the solenoid valve 13 is blocked. The voltage applied in the control chamber 11 system pressure presses together with the force of the nozzle spring 14, the nozzle needle 15 in the nozzle needle seat 16, so that the injection holes 17 are closed. If the solenoid valve 13 is actuated, there is the flow through the 8th
    Solenoid valve seat free, and fuel flows from the control chamber 11 through the outlet throttle 12, the solenoid valve armature chamber and the low-pressure bore 18 back into the fuel tank, not shown. A equilibrium pressure defined in the control chamber 11 by the flow cross-sections of inlet throttle 10 and outlet throttle 12 is so small that the system pressure applied in the nozzle chamber 19 is able to open the nozzle needle 15, which is displaceable longitudinally in the nozzle body, so that the spray holes 17 are released and an injection takes place.
    Due to the inertia of the fuel in memory 6, high-pressure line 8 and nozzle chamber 19, there are strong pressure oscillations on the nozzle seat 16 directly after closing the nozzle needle 15, since the flowing fuel has to be braked in a very short time. To reduce the pressure oscillations, a resonator is used. This consists of a resonator 20, which has the same length and the same diameter as the high-pressure line 8, and a resonator 21, which is attached to the memory-side end of the resonator 20 and connects them to the memory 6. When closing the solenoid valve 13, the pressure pulse generated at the nozzle seat 16 is propagated via the nozzle chamber 19 into the high-pressure line 8 and the resonator line 20. At the end of the high pressure line 8, a reflection of the pressure pulse at the open end takes place at the transition into the memory 6. At the same time, the pressure pulse running in the resonator line 20 is reflected at the closed end on the resonator throttle 21. The two reflected pressure pulses are phase-shifted by 180 ° due to the different reflection mode (open or closed end), so that they 9 cancel each other out when they meet in the nozzle chamber 19. As a result, there are no further pressure pulses on the nozzle seat 16, so that significantly less wear occurs here.
    However, the arrangement described is not able to lower even the first, occurring directly when closing the injector pressure peak. In the detailed illustration according to Figure 2, the inventive design of the high-pressure bore is shown, with which also said first pressure peak can be lowered. 2 shows a highly schematic representation of the injector 1, wherein the functional components described in more detail in Fig.l, namely the memory 6, the holding body 5, the valve plate 4, the throttle plate 3 and the injection nozzle 2 are only outlined without their individual Components, as described with reference to FIG. 1, individually represent. 2 shows that the high-pressure bore 8, which connects the high-pressure accumulator 6 to the injection nozzle 2, has in a first section 8 'an enlarged diameter compared to the prior art, namely a significantly larger diameter than in a second section 8' '. , The first section 8 'is pulled relatively far forward to the injection nozzle. The transition between the first portion 8 'and the second portion 8' 'is designated 22 and is arranged in the holding body 54. In the subsequent to the transition portion 22 of the holding body 5 and in the valve plate 4 and the throttle plate 3 passing through section 8 '', the high-pressure bore has a relation to the prior art unaltered cross-section, and in particular the same diameter as the resonator 20th
    权利要求:
    Claims (8)
    [1]
    1. An apparatus for injecting fuel into the combustion chamber of an internal combustion engine with at least one injector, which includes a high-pressure accumulator integrated in the injector body, an injection nozzle, which comprises an axially displaceably guided nozzle needle, which is surrounded by a nozzle chamber, a high-pressure accumulator with the Comprises injection nozzle connecting high-pressure bore and a parallel to the high-pressure bore resonator bore which communicates with the injector and communicates via a resonator in the high-pressure accumulator, characterized in that the high-pressure bore (8) has a first (8 '), to the high-pressure accumulator (6) connecting portion and a second (8'f), in the injection nozzle (2) opening portion, wherein the first portion (8 ') has a larger flow cross-section than the second portion (8' ').
    [2]
    2. Device according to claim 1, characterized in that the first (8 ') and the second portion (8' ') directly adjoin one another.
    [3]
    3. Apparatus according to claim 1 or 2, characterized in that the length of the first portion (81 2 3 4) at least twice, preferably at least three times the length of the second portion (8'f) corresponds. 1 device according to claim 1, 2 or 3, characterized in that the flow cross-section of the first 3 section (8 ') at least 1.5 times, preferably 4 at least 2 times, preferably at least 3 times, especially preferably at least 4 times the flow cross-section of the second section (8 '') corresponds.
    [4]
    5. Device according to one of claims 1 to 4, characterized in that the nozzle needle (15) for controlling its opening and closing movement of the pressure prevailing in a fuel under pressure control chamber (11) prevailing pressure in the axial direction can be acted upon, wherein the Control chamber (11) with an inlet throttle (10) having inlet channel (9) and an outlet throttle · (12) having drain passage in communication and at least one inlet or outlet channel opening or closing control valve (13) is provided with the the pressure in the control chamber (11) is controlled such that the inlet throttle (10) and the outlet throttle (12) are formed in a throttle plate (3), that the control valve (13) is formed in a valve plate (4) and that the high-pressure bore ( 8) and the resonator bore (20) through the valve plate (4) and the throttle plate (3).
    [5]
    6. The device according to claim 5, characterized in that the throttle plate (3) and the valve plate (4) passing through portion of the high pressure bore (8) the second portion {8 '') thereof or a part of the second portion (8 '') formed.
    [6]
    7. Apparatus according to claim 5 or 6, characterized in that the first portion (8 ') of the high-pressure bore in a holding body (5) is formed, which is arranged between the high pressure accumulator (6) and the valve plate (4).
    [7]
    8. The device according to claim 7, characterized in that the transition (22) from the first portion (8 ') in the second portion (8' ') of the high-pressure bore in the holding body (5) is arranged.
    [8]
    9. Apparatus according to claim 8, characterized in that at the transition (22) formed edge is rounded. Vienna, 26 January 2012 Applicant by: Haffner and Keschmann Patentanwälte OG
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    同族专利:
    公开号 | 公开日
    EP2807367B1|2015-10-14|
    EP2807367A1|2014-12-03|
    AT512439B1|2013-12-15|
    WO2013111007A1|2013-08-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2004005704A1|2002-07-02|2004-01-15|Siemens Aktiengesellschaft|Method for the production of a module with a moving insert for an injection valve and injection valve|
    AT509877A4|2010-11-02|2011-12-15|Bosch Gmbh Robert|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE|
    AT503660B1|2006-06-13|2007-12-15|Bosch Gmbh Robert|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE|
    AT501573B1|2006-06-13|2008-05-15|Avl List Gmbh|HYDRAULIC DEVICE WITH AT LEAST ONE PRESSURE MEMORY|DE102013013234A1|2013-08-08|2015-02-12|Man Diesel & Turbo Se|Injector for a fuel supply system of an internal combustion engine and fuel supply system|
    US9644590B2|2014-01-31|2017-05-09|Cummins Inc.|Fuel injection pressure pulsation dampening system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT1042012A|AT512439B1|2012-01-26|2012-01-26|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE|AT1042012A| AT512439B1|2012-01-26|2012-01-26|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE|
    EP13710897.3A| EP2807367B1|2012-01-26|2013-01-17|Device for injecting fuel into the combustion chamber of an internal combustion engine|
    PCT/IB2013/000208| WO2013111007A1|2012-01-26|2013-01-17|Device for injecting fuel into the combustion chamber of an internal combustion engine|
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