EP1485609B1 - Device for injecting fuel to stationary internal combustion engines - Google Patents

Device for injecting fuel to stationary internal combustion engines Download PDF

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Publication number
EP1485609B1
EP1485609B1 EP20030704234 EP03704234A EP1485609B1 EP 1485609 B1 EP1485609 B1 EP 1485609B1 EP 20030704234 EP20030704234 EP 20030704234 EP 03704234 A EP03704234 A EP 03704234A EP 1485609 B1 EP1485609 B1 EP 1485609B1
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EP
European Patent Office
Prior art keywords
fuel
pressure
injector
high
injection system
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.)
Active
Application number
EP20030704234
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German (de)
French (fr)
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EP1485609A1 (en
Inventor
Jaroslaw Hlousek
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
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Robert Bosch GmbH
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Filing date
Publication date
Priority to DE10210282 priority Critical
Priority to DE2002110282 priority patent/DE10210282A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE2003/000139 priority patent/WO2003076794A1/en
Publication of EP1485609A1 publication Critical patent/EP1485609A1/en
Application granted granted Critical
Publication of EP1485609B1 publication Critical patent/EP1485609B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/02Fuel-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
    • F02M63/0205Fuel-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
    • F02M63/0215Fuel-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02Fuel-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
    • F02M47/027Electrically actuated valves draining the chamber to release the closing pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025Common rails
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/02Fuel-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
    • F02M63/0225Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00Engines characterised by air compression and subsequent fuel addition
    • F02B3/06Engines characterised by air compression and subsequent fuel addition with compression ignition
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00Casings, e.g. crankcases or frames
    • F02F2007/0097Casings, e.g. crankcases or frames for large diesel engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Abstract

The invention relates to a fuel injection system used in internal combustion engines. The injection system comprises pumping units (2,3) which are used to pump fuel from a fuel tank (1) in order to supply at least one high pressure line (9,10) to the cylinders of the internal combustion engine. The at least one high pressure line (9,10) is used to supply a plurality of fuel injectors (11) respectively provided with an injector nozzle (16) which respectively provides a combustion chamber of the internal combustion engine with fuel. The at least one high pressure line (9,10) comprises line sections (17, 17.1, 17.2) connecting the individual fuel injectors (11) to each other. The bodies (20) of the fuel injectors (11) comprise an integrated storage chamber (36,36.1).

Description

Technical area

Internal combustion engines used as vehicle engines, stationary engines (generator engines) or used for propulsion of ships, usually have cylinder numbers between 2 and 20 cylinders. In these internal combustion engines is the Bore diameter of the respective cylinders within a broad spectrum, in part up to 500 mm for large diesel engines. Depending on the number of cylinders come individually tailored Fuel injection systems are used, which are individually matched to the number of cylinders have to be.

State of the art

DE 198 37 332 A1 relates to a control unit for controlling the pressure build-up in a pump unit. The control unit has a control valve and a connected thereto Valve operating unit on. The control valve is as inward in the flow direction opening I-valve formed, which in a housing of the control unit having axially displaceably mounted valve body, the closed control valve from the inside seated on a valve seat of the control valve. It is a throttle arrangement provided by the flow through the control valve at by a small stroke h throttled open control valve. When opened by this stroke control valve the valve seat is still open, another valve seat formed on the control valve However, closed, so that the pumped medium through the throttle holes through the control valve flows. Due to such throttled flow through the control valve At first, a lower pressure is built up in a high pressure area of the system. By contrast, when the control valve is completely closed, both the first valve seat closed as well as the other valve seat, whereby the bypass connection interrupted becomes. This leads to the build-up of a high pressure between the pump unit and the Low pressure range system compared to the high pressure range.

DE 42 38 727 A1 relates to a solenoid valve. The solenoid valve is used to control the Passage of a connection between an at least temporarily fluid high pressure brought high-pressure chamber, in particular a pump working chamber of a fuel injection pump and a low pressure room. It is a valve body inserted into a valve body and a bore disposed therein, in which a valve closing member in Shape of a piston from an electromagnet against the force of a return spring is displaceable. The piston tapers, starting from a circular cylindrical surface via a conical surface to a reduced diameter, wherein the conical surface with a conical, surrounding a circular cylindrical surface of the piston High-pressure chamber with a reduced diameter of the piston surrounding connecting valve seat on the valve body cooperates. Its cone angle is smaller formed as the cone angle of the conical surface of the piston, so that the piston via a at the transition between its cylindrical surface and the conical surface incurred Sealing edge cooperates with the associated valve seat. The sealing edge is in the overflow from the high pressure chamber to the low pressure chamber with a beginning downstream of the opening stroke becomes effective throttle point. This throttle point is through a throttle section in the overlap area between angular surface of the piston and a valve seat surface, wherein the angle of the conical surface of the piston is slightly, preferably 0.5 ° to 1 ° greater than the angle of the valve seat surface, so that the passage area between the conical surface of the piston and the valve seat surface over the entire circumference in overflow direction to the low pressure space at the beginning of the Opening stroke steadily decreases. Due to the high adjusting flow rates of the fuel between the injection phases - be it pre-, main- or Post-injection phases - can not completely exclude cavitation damage with this solution become.

DE 198 42 067 A1 discloses a fuel injection system for a diesel internal combustion engine, which is a high-pressure fuel pump in a high-pressure accumulator promotional high-pressure injection pump having. Furthermore, the fuel injection system with the high-pressure accumulator fluid-connected solenoid valve-controlled injectors, each of which has a Injection nozzle with a nozzle needle and a cooperating with this and a Control room delimiting control spool and one the pressure relief in the control room having controlling solenoid valve, wherein at each injector a storage volume of the High-pressure accumulator is provided and the storage volume of the high-pressure accumulator Connecting lines are connected together.

Presentation of the invention

The advantages of the solution according to the invention are, above all, that an injector principle regardless of the number of cylinders of the internal combustion engine, of the engine configuration (V-arrangement, W-arrangement, series arrangement) are used can, by instead of a rail component, the high-pressure supply line sections for connection be used by decentralized storage. The high pressure supply sections in turn, the individual injectors connect with each other; they are interchangeable and can to different cylinder spacings of the cylinders on the individual cylinder banks adapted to the internal combustion engine. The proposed solution offers increased flexibility in the construction of an injection system and its simpler Adaptability to different engine configurations, be it cylinder arrangements in V-, W- or in-line construction.

The principle of modularity is equally in the construction of the fuel injector used realized. There are injectors, intermediate plates at the respective injectors with trained in these inlet and outlet throttle, valve units and injector body for use. By replacing the intermediate plate, for example, the Drukkentlastung or pressurization of the control chamber of the injector by the dimensioning the throttle cross-sections influenced and to a variety of application conditions be adapted to the injector. The modular injector used Injector body can be designed in different lengths and thus optimal be adapted to the available space. The injector body comprises a storage space whose storage volume is about less than 80 times the maximum injected fuel quantity corresponds. This memory is by a header the fuel injector formed inlet throttle with high pressure fuel applied. The integrated memory in the injector is the flow rate downstream of the fuel to the nozzle chamber limiting flow restrictor. The Inlet throttle to the memory in the head region of the injector is preferably designed such a multiple injection is possible without pressure pulsations in the high-pressure line sections, which are connected to the head of the fuel injector, occur. This is also the stable pressure level in storage of the other injectors not disturbed for injecting fuel. Advantageously, the pressure level can be in the injector body integrated storage space through the inlet throttle on a Keep pressure level, which corresponds to the pressure level, in one in one of the delivery units integrated pressure accumulator prevails.

The pressure pulsations in this memory and between the memory and the nozzle are thanks to the small distance between the memory and the nozzle significantly smaller in comparison to conventional injection systems.

About the integrated into the injector body storage spaces, their inlet throttle and on one of the delivery units integrated or located in the vicinity of this storage space, The respective injection processes are independent of the engine configuration the internal combustion engine, the length of the high pressure line sections and the Cylinder number of the internal combustion engine. The injection system can be due to the central memory arrangement for damping the pump pulsation at a plurality use differently configured internal combustion engines and thus reduces the number of variants in terms of the required components significantly. Of the the storage units associated storage space and the injector-side pressure accumulator are made by simple, modular design and therefore easily replaceable high-pressure line sections interconnected, whereby the adaptability of the injection system applicable to a wide variety of internal combustion engine configurations is simplified and the quality of the injections regardless of the line length the storage areas interconnecting pipe sections becomes.

drawing

Reference to the drawings, the invention will be described in more detail below.

It shows:

FIG. 1
the components of an injection system,
FIG. 2
the structure principle of a fuel injector of the injection system of Figure 1,
FIG. 2a
the enlarged view of the throttle geometry of the inlet throttle to the storage space
FIG. 3
the longitudinal section through an embodiment of an injector of Figure 2 and
FIG. 4
the top view of the embodiment of the injector of Figure 3.
FIG. 5
an embodiment of the fuel injector with transbuilt storage space in plan view
FIG. 6
the embodiment according to Figure 5 in section,
FIG. 7
the schematic representation of another embodiment variant with a high pressure fitting as part of the injector,
FIG. 8
a schematic diagram of the high pressure fitting and
FIG. 9
the representation of further built-in components in a fuel injector below the integrated in this memory space 36th
variants

FIG. 1 shows the components of an injection system.

The injection system shown in Figure 1 for supplying an internal combustion engine with fuel includes a fuel reservoir 1. A feed pump 2 promotes from the Fuel tank 1 fuel. On the discharge side, the feed pump 2 is a high-pressure pump unit 3 downstream of which a throttle point 4 is connected upstream. The throttle 4 is a variably configured throttle point, which are controlled via a control unit 12 can. The feed pump 2 is a pressure control valve 8 downstream, which the inlet pressure to the high-pressure pump unit 3 controls and with the fuel reservoir 1 in Connection stands.

The high-pressure pump unit 3 comprises an integrated pressure accumulator 5. The pressure accumulator 5 is secured by a pressure relief valve 7 whose outlet into the fuel reservoir 1 opens. Furthermore, the integrated pressure accumulator 5 comprises a pressure sensor 6, which with the control unit 12 is in communication and on the in the integrated pressure accumulator. 5 prevailing pressure to the control unit 12 is reported back. From the integrated pressure accumulator 5 branches off a first high-pressure line 9. About the first high pressure line 9 can be, for example, the injectors 11 of the cylinder of a first cylinder bank a Supply internal combustion engine with high-pressure fuel. These Configuration of an injection system, for example, in the fuel supply of Cylinders selected a row-type internal combustion engine. Besides can branch off from the integrated pressure accumulator 5 also other high pressure supply lines. In the illustration according to FIG. 1, a further high-pressure line 10 is for supply the injectors 11 of cylinders of another engine bank of an internal combustion engine indicated schematically, the cylinder of such an internal combustion engine can be arranged in V-construction. In addition, one in Figure 1 not shown third high-pressure feed line branch off to a third cylinder bank, for example in internal combustion engines whose cylinders are arranged in W-construction and therefore three or more cylinder banks are formed.

The first of the integrated pressure accumulator 5 laxative high pressure supply line 9 goes into a first line section 17 via. The line section 17 is in the head region 15 of the injector 11 connected. From the head portion 15 of the injector 11, at the brennraumseitigem End of an injector nozzle 16 is arranged, branches a first line section 17.1 from, which is connected to the head portion 15 of another injector 11. From his Head portion 15 branches another line section 17.2 to the head portion 15 of the next Injector 11 from. Depending on the number of cylinders on a cylinder bank of an internal combustion engine can the sequence of the line sections 17, 17.1, 17.2 to further, not shown here injectors 11 for injecting fuel into the cylinder Continue combustion engine. The individual injectors 11 for the supply of Combustion chambers of an internal combustion engine with fuel are transmitted via the control unit 12 electronically controlled via actuators 14. The individual injectors 11 are connected via low-pressure line sections 13 with a manifold, about which the leakage amount or control amounts of the injectors low pressure side of the Fuel reservoir 1 are supplied. Also, the injectors 11 a second and a third cylinder bank - which are not shown in Figure 1 - are on the low pressure side Low pressure lines 13 to the fuel reservoir 1 in conjunction, in which the Leakage or Absteuermengen the injectors 11 are fed back.

FIG. 2 shows the construction principle of an injector which is connected to injection systems according to the Representation of Figure 1 is used.

The illustration according to Figure 2 it can be seen that the injector 11 shown there a Injector body 20, a control part 21, an intermediate plate 22 and the combustion chamber side End includes an injector nozzle 16.

The injector nozzle 16 includes a nozzle needle 23 which is movable in the vertical direction is arranged. The nozzle needle 23 comprises a needle guide 24, on which in the circumferential direction offset with respect to the nozzle needle 23, arranged individual flow areas are, via which of a nozzle needle chamber 40 of fuel to the nozzle needle tip flows, pending there and with vertical approach movement of the nozzle needle 23 via a or injected several injection ports 38 into the combustion chamber of the internal combustion engine becomes.

The nozzle needle 23 comprises a collar on which a spring 26 is supported. The feather 26 acts on an upper collar of a sleeve-shaped component 25, which by the at the collar of the nozzle needle 23 supporting spring 26 against the underside of the intermediate plate 22 is pressed. The sleeve-shaped component 25 and the upper end side the nozzle needle. 23 limit a control chamber 27, the pressurization or Pressure relief the vertical movement of the nozzle needle 23 within the nozzle body causes. The nozzle chamber 27 is on the one hand by a running in the intermediate plate Inlet restrictor 28 via a high-pressure fuel line 29 with high pressure Fuel is applied. On the other hand, the control chamber 27 via a likewise in the Intermediate plate 22 trained outlet throttle element 30 depressurized. For pressure relief of the control chamber 27, a valve 31 is provided in the control part 21, which has a in the injector 20 trained actuator 34 is actuated. The actuator 34 is in the Schematic diagram according to the illustration in Figure 2 designed as a ring magnet and is about the control 14 is controlled by the control unit 12. The valve 31 is provided with a Ankerartigen valve plate 32 is provided, which is enclosed by an electromagnet 34 Spring element 33 is pressed in its formed in the control part 21 seat 42. When closed Seat 42, i. not activated actuator 34, is a drainage channel 41, which is the Outflow throttle 30 of the control chamber 27 is connected downstream, closed. Below the valve seat 42 of the valve 31 in the control part 21 extends meandering configured Drainage channel, which is provided with a flow channel 43 which is formed in the injector body 20, in Connection stands. Via the drainage channel 43, the volume of depleted fuel flows into the provided on the low pressure side lines 13 (see illustration according to Figure 1).

The injector body 20 of the fuel injector 11 comprises a storage space 36. The storage volume in the storage space 36 is less than 80 times the maximum injection quantity, which via the injection openings 38 on the injector nozzle 16 in one in Figure 2 not shown combustion chamber of an internal combustion engine is injected. Prefers the storage volume of the storage space 36 is 60 to 80 times the injection quantity. The storage space 36 in the head region 15 of the injector 20 is about an inlet throttle 37 pressurized fuel under high pressure. The inlet throttle 37 in turn branches from a likewise in the head region of the injector body 20th trained channel 44 from. The channel 44 is on the one hand via the line section 17 of High-pressure supply line 9 is acted upon by high-pressure fuel; on the other hand is the channel 44 in the head portion 15 of the injector 20 over the first line section 17.1 with a further head region 15, not shown here, of another one Fuel injector 11 in conjunction. The channel cross-section of the channel 44 in the head area 15 of the injector 20 is designated by reference numeral 45. About the pipe section 17 of the high pressure line 9 are therefore in the high pressure pump unit 3 integrated pressure accumulator 5 and - with the interposition of the inlet throttle 37 - the Pressure accumulator 36 within the injector body 20 in conjunction. The sizing the inlet throttle 37 between the channel 44 in the head region 15 of the injector body 20th and the injector-side storage space 36 ensures the independence of the individual Injection processes regardless of the number of cylinders of the internal combustion engine, regardless of their engine configuration, whether in a series construction, in V-arrangement or in W-arrangement as well as independent of the length of the individual connecting lines among themselves. Furthermore, by appropriate design of the inlet throttle 37th to the storage space 36 in the injector body 20 ensures that several times in succession switched injection operations are possible without that in the storage space 36 and in the Line sections 17 and 17.1 build pressure pulsations and thereby others Fuel injection injectors 11 are affected. This allows pre, main and Allow post-injection phases without pressure pulsation. The inlet throttle 37 to the storage space 36 allows maintaining nearly identical pressure levels in storage space 36 the injection process and the integrated pressure accumulator 5 of the high-pressure pump unit 3. Advantageously, the throttle geometry of the inlet throttle 37 to the storage space with different Durchflußbeiwerten executed, as the representation of Figure 2a, see. Reference numeral 37.1, can be removed.

The storage space 36 in the injector 20 of the fuel injector 11 is a flow restrictor 35 downstream. The body of the flow restrictor 35 includes a transverse bore with throttle effect 54 and is biased by a spring element 46. The flow restrictor 35 is the storage space 36 nach- and the high-pressure fluid line 29th upstream of the injector body 20. About the flow restrictor 35 is an undesirable Excessive amount of malfunction that prevents, for example, when the nozzle is leaking or limited such that the occurrence of an undesirable excess only at an injection process is possible. On the body of the flow restrictor is the transverse bore 54 formed such that it is perpendicular to the axis of symmetry of the body of the Durchflußbegrenzers 35 extends, wherein the bottom portion of the body of the flow restrictor is closed, so that an outflow of fuel only through the openings the transverse bore 54 in the wall of the body of the flow restrictor 35 sets The at the flow restrictor 35 in the injector body 20 subsequent high-pressure fuel line 29 extends through the control part 21 before the high-pressure fuel line 29 in the intermediate plate 22 opens into a two-armed channel. An arm the channel in the intermediate plate 22 runs in the inlet throttle 28 for pressurizing of the control chamber 27, while the further arm of the channel in a nozzle needle chamber 40 opens. About the nozzle needle chamber 40 and formed on the needle guide 24 Flow areas enter fuel into the nozzle needle 23 below the needle guide 24 surrounding annulus and is - a corresponding vertical lifting movement assuming the nozzle needle 23 - not on the injection openings 38 in the here injected combustion chamber of an internal combustion engine injected.

The modular fuel injector 11, an injector body 20, a control part 21, comprising the intermediate plate 22 and an injector nozzle 16 is, with the aid of a Union nut formed nozzle retaining nut 39 mounted. The modular design favorably, the intermediate plate 22, in which the inlet throttle 28 and the outlet throttle 30 are formed, against another intermediate plate 22 the same To replace height, in which the inlet throttle 28 and the control chamber 27 relieving Outflow throttle 30 formed in larger or smaller diameter geometries are to exchange. Thus, by simply replacing the modular design Intermediate plate 22 a different pressure build-up or pressure relief behavior at Ansteuerraum 27 and a resulting different stroke characteristics of the nozzle needle 23 are set. The modular structure of the fuel injector 11 according to the Schematic representation in Figure 2 also offers the advantage of a different feasibility the injector body 20 in different heights in the cylinder head area an internal combustion engine resulting space in an advantageous manner exploit.

Figure 2a shows an enlarged view of the throttle geometry of a supply throttle point to the storage room.

The inlet throttle 37 has advantageously on the line sections 17, 17.1 assigning side of a rounded inlet, which is an inflow of fuel in the Memory space 36 favors. The throttle bore of the inlet throttle 37 narrows in Direction to their mouth point in the storage space 36 continuously. The angle, in which conically tapering the cross-sectional constriction in the direction of the storage space 36 is formed, is preferably in the range between 10 ° and 20 °, based on the Symmetrical axis of the throttle bore of the inlet throttle 37. At the mouth of the inlet throttle 37 in the storage space 36, the throttle bore is sharp-edged, which a back flow of fuel via the inlet throttle 37 in the channel 44 between the line sections 17, 17.1 counteracts.

FIG. 3 shows the longitudinal section through an alternative embodiment of the fuel injector FIG. 2.

In the embodiment of the fuel injector according to FIG. 3, in the head region 15 of the injector screwed an insert 51 with the injector body 20 by means of a clamping nut. Perpendicular to the plane extending in the insert 51 of the channel 44, the over an inlet bore throttle 37 communicates with the storage space 36. The insert 51 protrudes with its lower portion in a formed in the injector 20 Cavity 52 and acts on these two in the wall of the insert 51st trained openings. Below the insert 51, the flow restrictor closes 35 (see schematic diagram according to Figure 2), the storage space 36 nach- and the high-pressure fuel line 29 is connected upstream. The screw connection between the Clamping nut 50 and the stop of the injector body 20 is indicated by reference numeral 53. The high-pressure fuel line 29 extends slightly inclined through the injector body 20 and goes into a corresponding bore section on the control part 21, passes through the intermediate plate 22 before the high-pressure fuel line 29 at the nozzle needle space 40 of the injector nozzle 16 opens. In the injector nozzle 16, the nozzle needle 23 is in one Needle guide 24 movably mounted in the vertical direction. The nozzle needle 23 is over a Spring element 26 pressurized. In the control part 21 of the injector configuration according to FIG 3, the valve 31 is received, the valve disc 32 via a ring magnet trained actuator 34 is movable in the vertical direction. The ring magnet 34 encloses the valve 31 in its closed position acting on closing spring 33; the electromagnet 34 of the valve 31 actuating actuator is connected via leads 14, the extend in a substantially vertical direction through the injector 20, driven, the corresponding connection connection 55 is formed laterally on the injector body 20 and designed as a plug contact. The injector nozzle 16 enclosing nozzle retaining nut 39 also takes the intermediate plate 22 and the actuatable valve 31 receiving control part 21. The nozzle lock nut 39 and the lower end of the injector body 20 are bolted together. Also in the embodiment of the fuel injector 11 according to Figure 3, both the one control chamber in the intermediate plate 22 27 pressurizing inlet throttle 28 and the pressure-relieving the control chamber 27 Outflow throttle 30 is formed, but not shown in the illustration of Figure 3, see. to schematic representation of Figure 2.

FIG. 4 shows the plan view of the embodiment variant of the injector according to FIG. 3.

In the head region 15 of the fuel injector 11 as shown in Figure 4 is the insert 51 shown partially cut. At the outgoing at an angle chamfers of the channel 44 become the line sections 17 shown in FIGS. 1 and 2 or 17.1 of the first high pressure line 9 connected. From the channel 44 in the insert 51 branches off the inlet throttle 37, with the formed in the insert 51 storage space 36 is pressurized with high pressure fuel. The insert 51 and the injector body 20 of the fuel injector 11 are connected via a clamping nut 50 with each other screwed. In the illustration of the plan view of Figure 4 are the connectors 55 recognizable, with which an example configured as an electromagnet Actuator, which may be included within the injector body 20 is driven. Reference numeral designates the nozzle lock nut 39, in which both the injector 16 as also the overlying intermediate plate 22 and the control part 21 are received and with their trained at the top of internal thread these components with the be mounted on the combustion chamber side end of the injector body 20. From the with reference numerals 38 designated injection ports, the fuel in the combustion chambers of Internal combustion engine, their cylinders are in series construction, in V-arrangement or arranged in W-arrangement, injected.

FIG. 5 shows an embodiment of the fuel injector with transverse storage space in the plan view.

Between the line section 17 and the first line section 17.1 extends through the housing of the storage space 36 of the channel 44, which is formed in the channel cross-section 45 is. The separated by a cavity in the housing of the storage space 36 Channels open into this, in which an inlet throttle body 37 is inserted. The body of the inlet throttle 37 has at the said cavity opposite End of a flow-favorable throttle geometry 37.1 and can at the inlet point be rounded. According to the illustrated in Figure 2a in enlarged cross-section Throttle geometry, the throttle channel can be a continuously on its orifice in the storage space 36 narrowing cross-section, wherein the wall of the Throttle bore within the throttle body 37 at an angle between 10 ° and 20 ° in With respect to the center line of the throttle bore obliquely. The in the embodiment according to FIG. 5 in transverse orientation 48 in the head region 15 of the fuel injector 11 recorded storage space is by a closure 47, for example, as a screw-in may be formed, pressure sealed. The here in dashed Execution indicated flow restrictor 35 is connected to the interior of the storage space 36 installed in the transverse direction 48 via a channel 49 in connection. Over the channel 49 flows fuel from the interior of the storage space 36 to the flow restrictor, the Flow of fuel in the direction through the high-pressure fuel line 29 to the injector of the fuel injector 11 controls.

Figure 6 shows the embodiment of the fuel injector according to Figure 5 with in the transverse direction built-in storage space on average.

From the illustration according to FIG. 6, it can be seen that, for reasons of strength, the channel 49, which connects the storage space 36 with the flow restrictor 35, tangent to the circumference the storage space 36 branches off to material-fatiguing pressure loads of the material of the injector body 20. Above the flow restrictor 35 is the Injector 20 sealed pressure-tight by a screw 47. The screw-in closure 47 favors the simple assembly of the flow restrictor 35 acting on Spring 46, which in the interior of the injector body 20 above the high-pressure fuel line 29 is inserted. Analogous to the representation of the flow restrictor in 2, the flow restrictor 35 shown in FIG. 6 likewise comprises a transverse bore 54 and is analogous to the representation of the flow restrictor 35 in the embodiment the solution proposed by the invention by a trained as a spiral spring Spring element 46 biased.

Figure 7 shows the schematic representation of a variant with a high-pressure fitting as part of an injector body.

In contrast to the embodiment variant of the injection system shown in FIG larger self-igniting internal combustion engines, the fuel injectors 11th according to the scheme shown in FIG. 7, not directly above that in the head area 15 the injector extending channels 44 between the line sections 17, 17.1 and 1.2 acted upon by the inlet throttle 37. Between the inlet throttles 37, preferably in a geometry according to the geometry shown in Figure 2a on an enlarged scale are formed, a high-pressure line connection piece 100 extends. This high-pressure line connection piece 100, essentially as a tubular body with a thickened Wall formed, acts on the fuel injector 11 with high Pressurized fuel.

The throttle 4, the high-pressure pump unit 3, pressure sensor 6, the pressure relief valve. 7 and the high pressure line 9 and 10 to the cylinder banks of the internal combustion engine essentially correspond to the components already shown in FIG Injection system.

Figure 8 shows a schematic diagram of the high-pressure connection piece, which is located between the channel 44 and the injector body 20 of the fuel injector 11 extends.

From the illustration according to FIG. 8 it is apparent that analogously to the illustration of the embodiment variants According to Figure 2, 3, 4 and 5, the inlet throttle 37 is acted upon by a channel 44 is formed in a channel cross section 45. At this are about the in Figure 5, for example, connection points illustrated the high-pressure line sections 17.2 or 17.1 - here indicated by dashed arrows - attached. About the inlet throttle 37, preferably formed in a throttle geometry shown in Figure 2a 37.1 is, the high-pressure connector 100 is applied, which is another Storage space 36.1 comprises, which is substantially symmetrical to the axis 103 of the high pressure fitting 100 is formed. The high pressure fitting 100 extends in a length 101 between the head portion 15 and the injector body 20 of the fuel injector 11. About the inlet throttle 37 occurs from the channel 44 fuel in the other Storage space 36.1 within the high-pressure fitting 100, flows through an L-shaped trained line connection 104 in the interior of the storage space 36 in the upper Area of the injector body 20 of the fuel injector 11 a. The fuel injector 11 comprises a union nut 39 shown here schematically, via which the injection nozzle part 16 is connected to the injector 20 at a screw connection. The High pressure fitting 100, a further storage space 36.1 comprising substantially is tubular, is at a designed as a screw connection point 102 is connected to the injector body 20 of the fuel injector 11.

By the embodiment shown in Figure 8, on the one hand, the flexibility in Installation of the fuel injectors 11 and with regard to the line connection between the Line sections 17.1, 17.2 and the injector 20 are improved. on the other hand can the volume of the storage space 36 through the integration of the additional storage space 36.1 into the interior of the high-pressure line connection 100 increase.

FIG. 9 shows the illustration of further installation components in a fuel injector below of the integrated in the injector body storage space.

The inlet throttle 37, which is not shown in FIG. 9, is under high pressure Fuel acted upon further storage space 36.1, in the high-pressure line connection 100 is formed, extends substantially coaxially to the axis of symmetry 103rd of the high pressure line fitting. This im preferably by means of a screw thread 102 laterally screwed into the injector body 20 of the fuel injector 11. in the Area of a transitional bore 106, the fuel volume flows from the other Storage space 36.1 in the storage space 36 in the interior of the injector body 20 of the fuel injector 11 over. The storage space 36 within the injector body 20 is over a Screw-in closure 47 at the top of the fuel injector 11 sealed pressure-tight. Below the storage space 36 in the injector body 20 is the flow restrictor 35, which via a spring element 46 analogous to those shown in Figures 5 and 2 Flow restrictor 35 is biased. Below the flow restrictor 35 extends the high pressure line 29, the -. Representation according to Figure 2 -. By a control part 21, an intermediate plate 22, a nozzle needle chamber 40 within the fuel injector eleventh subjected to high-pressure fuel. With reference numeral 33 is a Closing spring referred to, which is an electromagnet 34 (not shown in Figure 9) applied. The control part 21 is connected via the nozzle lock nut 39 to a screw 105 with the lower portion of the injector body 20 of the fuel injector eleventh pressure-tight and centered connected. Reference symbol 43 denotes the leakage oil channel, while with reference numeral 14, the control of the solenoid valve, not shown in Figure 9 34 is designated, of which the closing spring 33 is shown only schematically is. By the manner shown in Figure 9, the loading of the storage space 36th indirectly via a further storage space 36.1, in the interior of a high-pressure line connection 100 is integrated, can in comparison to the embodiment according to Figure 2 shows the height of the injector, which is usually in the cylinder head area of self-igniting Internal combustion engines must be accommodated, reduced what its installation options in the cylinder head area improved. By in FIG. 5 and FIG. 6 shows the embodiment of the memory arrangement in the transverse direction 48 Also significantly improve the installation height of a fuel injector, so that a more flexible design of injectors is possible, in particular an integration the inventively proposed, a storage space 36 and a further storage space 36.1 in a high-pressure connection piece 100 having fuel injectors 11 in the cylinder head area can be significantly improved.

LIST OF REFERENCE NUMBERS

1
Fuel reservoir
2
feed pump
3
High-pressure pump unit
4
restriction
5
integrated pressure accumulator
6
pressure sensor
7
Pressure relief valve
8th
Pressure control valve
9
High pressure line first cylinder bank
10
High pressure line further engine bank
11
fuel injector
12
control unit
13
Low-pressure line
14
control
15
Injektorkopfbereich
16
injector nozzle
17
line section
17.1
first line section
17.2
further line section
20
injector
21
control part
22
intermediate plate
23
nozzle needle
24
needle guide
25
shell
26
spring element
27
control room
28
Inlet throttle control chamber
29
High-pressure fuel line
30
outlet throttle
31
Valve
32
Valve disc (anchor)
33
closing spring
34
electromagnet
35
restrictor
36
storage space
36.1
additional storage space
37
Inlet throttle storage space
37.1
throttle geometry
38
Injection ports
39
Nozzle clamping nut
40
Nozzle needle space
41
drain channel
42
valve seat
43
Leakage channel
44
channel
45
Channel cross section
46
spring element
47
shutter
48
Transverse orientation storage space 36
49
channel
50
locknut
51
Injektorkopfeinsatz
52
cavity
53
threaded connection
54
cross hole
55
electrical connection
100
High-pressure connector
101
Length from the high pressure fitting
102
attachment
103
axis of symmetry
104
channel connection
105
threaded connection
106
About Hole

Claims (11)

  1. Injection system for fuel for use on internal combustion engines, with conveying assemblies (2, 3) for the conveyance of fuel out of a fuel reservoir (1) for the supply of at least one high-pressure line (9, 10) to the cylinders of the internal combustion engine, the at least one high-pressure line (9, 10) supplying a number of fuel injectors (11) which contain an injector nozzle (16) supplying a combustion space of the internal combustion engine with fuel, and the at least one high-pressure line (9, 10) comprising line segments (17, 17.1, 17.2), by means of which the individual fuel injectors (11) are connected to one another, which, in turn, in each case contain an accumulator space (36, 36.1) integrated in an injector housing (20), characterized in that a duct (44) runs in the head region (15) of the fuel injector (11), which duct is acted upon with high pressure via the line segments (17, 17.1) of the high-pressure line (9, 10), and an inflow throttle (37) branches off to the accumulator space (36) in the head region (15) of the fuel injector (11), and the fuel injector (11) is constructed modularly so as to contain an injector body (20), a control part (21), an intermediate plate (22) and an injector nozzle (16).
  2. Injection system according to Claim 1, characterized in that the accumulator space (36) is arranged in the head region (15) of the injector body (20).
  3. Injection system according to Claim 1, characterized in that the accumulator space (36) is arranged in the longitudinal direction in the injector body (20).
  4. Injection system according to Claim 2, characterized in that the accumulator space (36) is received in the transverse direction in the injector body (20).
  5. Injection system according to Claim 1, characterized in that the accumulator space (36) is connected in the injector body (20) to the line segments (17, 17.1, 17.2) via a high-pressure connection piece (100) containing a further accumulator space (36.1).
  6. Injection system according to Claim 1, characterized in that the head region (15) of the fuel injector (11) is designed as an insertion piece (51) which is connected sealingly to the injector body (20).
  7. Injection system according to Claim 1, characterized in that the accumulator space (36) in the injector body (20) is followed by a spring-loaded throughflow limiter (35) and preceded by a high-pressure fuel line (29) to the nozzle-needle space (40).
  8. Injection system according to Claim 1, characterized in that throttle elements (28, 30) relieving of pressure or subjecting to pressure a control space (27) are formed in the intermediate plate (22).
  9. Injection system according to Claim 1, characterized in that the control space (27) is delimited by a sleeve (25), by a nozzle needle (23) moveable in relation to the latter and by the intermediate plate (22).
  10. Injection system according to Claim 1, characterized in that the volume of the accumulator space (36) corresponds to 50 times to 80 times the maximum injection quantity.
  11. Injection system according to Claim 1, characterized in that the inflow throttle (37) assigned to the accumulator space (36) is designed in such a way that the pressure level in the accumulator space (36) of the fuel injector (11) corresponds to the pressure level prevailing in a pressure accumulator (5) integrated into one of the conveying assemblies (2, 3).
EP20030704234 2002-03-08 2003-01-20 Device for injecting fuel to stationary internal combustion engines Active EP1485609B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10210282 2002-03-08
DE2002110282 DE10210282A1 (en) 2002-03-08 2002-03-08 Device for injecting fuel into stationary internal combustion engines
PCT/DE2003/000139 WO2003076794A1 (en) 2002-03-08 2003-01-20 Device for injecting fuel to stationary internal combustion engines

Publications (2)

Publication Number Publication Date
EP1485609A1 EP1485609A1 (en) 2004-12-15
EP1485609B1 true EP1485609B1 (en) 2005-11-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030704234 Active EP1485609B1 (en) 2002-03-08 2003-01-20 Device for injecting fuel to stationary internal combustion engines

Country Status (7)

Country Link
US (1) US7025045B2 (en)
EP (1) EP1485609B1 (en)
JP (1) JP4404640B2 (en)
CN (1) CN100365269C (en)
AT (1) AT308677T (en)
DE (2) DE10210282A1 (en)
WO (1) WO2003076794A1 (en)

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Also Published As

Publication number Publication date
EP1485609A1 (en) 2004-12-15
JP4404640B2 (en) 2010-01-27
AT308677T (en) 2005-11-15
US7025045B2 (en) 2006-04-11
DE10210282A1 (en) 2003-09-25
JP2005519233A (en) 2005-06-30
CN1507538A (en) 2004-06-23
DE50301551D1 (en) 2005-12-08
US20040187848A1 (en) 2004-09-30
CN100365269C (en) 2008-01-30
WO2003076794A1 (en) 2003-09-18

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