GB2341637A - Fuel injection system for a diesel i.c. engine, with solenoid injectors each having an accumulator - Google Patents

Fuel injection system for a diesel i.c. engine, with solenoid injectors each having an accumulator Download PDF

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Publication number
GB2341637A
GB2341637A GB9921494A GB9921494A GB2341637A GB 2341637 A GB2341637 A GB 2341637A GB 9921494 A GB9921494 A GB 9921494A GB 9921494 A GB9921494 A GB 9921494A GB 2341637 A GB2341637 A GB 2341637A
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GB
United Kingdom
Prior art keywords
injector
pressure
injection system
fuel injection
connection
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.)
Granted
Application number
GB9921494A
Other versions
GB9921494D0 (en
GB2341637B (en
Inventor
Karl-Heinz Hoffmann
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of GB9921494D0 publication Critical patent/GB9921494D0/en
Publication of GB2341637A publication Critical patent/GB2341637A/en
Application granted granted Critical
Publication of GB2341637B publication Critical patent/GB2341637B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Each injector 1 has a nozzle (2, fig.2) with a needle (4) and a control plunger (5) which partly defines a control chamber 8, the pressure in which can be relieved by a solenoid valve 7. A high pressure pump 12 supplies fuel to an accumulator 15 associated with each injector, the accumulators 15 being connected by lines 11. The accumulator 15 may take the form of an annular space 16 inside the injector, fig.2, or may be formed as an elongate hollow body in the high-pressure connection 10 to each injector (fig.4). Because the storage volume of the accumulators 15 is located directly at each injector, rather than being accommodated in the supply line as with the conventional common rail, pressure fluctuations are largely eliminated and costs are reduced.

Description

37 -23410 Fuel injection system for a diesel internal combustion en i= 9=
The invention concerns a fuel injection system for a diesel internal combustion engine, having a high-pressure injection pump, which pumps the fuel into a high-pressure accumulator, and having solenoid-valvecontrolled injectors, which are flow-connected to the high-pressure accumulator and each of which has an injection nozzle with a nozzle needle as well as a control plunger, interacting with the latter and bounding a control chamber, and a solenoid valve controlling the pressure relief in the control chamber, and also having a fuel inlet running in the injector to the needle seat of the nozzle needle.
MTZ Motortechnische Zeitschrift' [automotive journal] 58(1997)10 discloses such a fuel injection system for diesel internal combustion engines in which a high-pressure injection pump compresses the fuel to a high pressure of up to about 1350 bar and pumps it to a high-pressure accumulator. This high-pressure accumulator is a common supply line, a socalled common rail, for all the solenoidvalve-controlled injectors, in other words fuel flows from this supply line via respective injection lines or connecting lines to assigned injectors, to be precise on the one hand into the control chamber bounded by the control plunger and on the other hand via the fuel inlet into the pressure chamber surrounding the nozzle needle.
In the case of this common rail system, undesired pressure fluctuations occur between injectors and the supply line acting as a high-pressure accumulator.
The present invention seeks to minimise the pressure fluctuations usually occurring between the injectors and the high-pressure accumulator by means of simple measures on the fuel injection system.
According to the present invention there is provided a fuel injection system for a diesel internal combustion engine, having a high-pressure injection pump, which pumps the fuel into a high-pressure accumulator, and having solenoidvalve-controlled injectors, which are flow-connected to the high-pressure accumulator and each of which has an injection nozzle with a nozzle needle as well as a control plunger, interacting with the latter and bounding a control chamber, and a solenoid valve controlling the pressure relief in the control chamber, and also having a fuel inlet running in the injector to the needle seat of the nozzle needle, wherein a storage volume of the high-pressure accumulator is provided at each injector and the storage volumes of the injectors are connected to one another by connecting lines.
2 Beneficial developments of the invention are further specified in the subclaims.
The fact that the storage volume of the high-pressure accumulator is no longer accommodated in the supply line, but directly at each injector, has the effect that undesired pressure fluctuations can be largely eliminated.
Costs are saved by dispensing with the supply line; this also results in more installation space.
Furthermore, it gives rise to the advantage that neighbouring injectors can be connected to one another by short connecting lines.
An advantageous embodiment is obtained by the special position of the storage volume in the injector, making it possible to dispense with the additional fuel inlet, at least in this region.
If appropriate, an embodiment in which the high-pressure connection protruding laterally from the injector receives the storage volume, to and from which the injection line leads, can be used.
High-pressure accumulators are also suitable, however, for injectors in which each nozzle needle can be operated directly by means of an actuator.
Embodiments of the invention are explained in more detail below with reference to the drawing, in which:
Figure 1 shows in longitudinal section a solenoid-valve-controlled injector with a storage volume integrated in the region of the control plunger, Figure 2 shows in an enlarged representation the upper part of the injector with an integrated storage volume, Figure 3 shows in an enlarged representation an injector with an integrated storage volume in the region of the nozzle needle, Figure 4 shows an injector of which the storage volume is accommodated in the high-pressure connection, Figure 5 shows injectors of which the high-pressure connections having the storage volume are connected to one another by connecting lines, and Figure 6 shows another line arrangement of the connecting lines to the high-pressure connections.
A solenoid-valve-controlled injector 1, shown in Figure 1, of a fuel injection system intended for diesel (compression ignition) internal combustion engines essentially comprises an injection nozzle 2 with a spring-loaded nozzle needle 3 4, which is guided in the nozzle body 3 and on the rear side of which there is arranged a control plunger 5, which together with a valve piece 6 of a solenoid valve 7 bounds a control chamber 8.
The valve piece 6 has a sleeve-shaped part 6a, surrounding the control plunger 5, and a supporting collar 6b which is on the solenoid valve side and rests in a sealing manner on a housing part 9 of the injector 1.
Formed laterally onto the housing part 9 of the injector 1 is a highpressure connection 10 for an injection line or connecting line 11. Via this connecting line 11 and the high-pressure connection 10, fuel pumped by a high-pressure injection pump 12 passes via a fuel inlet 13, running in the injector 1, on the one hand into a pressure chamber 14, surrounding the nozzle needle 4, and on the other hand into the control chamber 8 on the solenoid valve side.
Each injector 1 is provided with a high-pressure accumulator 15 which has a defined storage volume and, according to Figures 1 and 2, is designed as an annular intermediate space 16 between the housing part 9 of the injector 1 and the sleeve-shaped part 6a of the valve piece 6. Opening into this elongated high-pressure accumulator 15, approximately in the longitudinal centre, is the high-pressure connection 10. At the end of the high-pressure accumulator 15 on the nozzle needle side there leads away the fuel inlet 13, reaching as far as the pressure chamber 14.
The high-pressure accumulator 15 is connected in its region on the solenoid valve side to the control chamber 8 via a radial bore 17, running in the valve piece and having a restrictor 20. When the solenoid valve 7 is opened, the valve ball 18 lifts off its valve seat 19 and causes a drop in fuel pressure in the control chamber 8, making the injection nozzle open. When the solenoid valve 7 closes, the full accumulator pressure acts on the control plunger 5 and the injection nozzle closes again.
The storage volumes of all the injectors are dimensioned in such a way as to provide pressure surge damping at least equally good to that obtained when an otherwise customary connecting line (common rail) is used.
Furthermore, an acceptable pressure drop at the injector is obtained during injection.
The injector 1 according to Figure 3 contains a high-pressure accumulator 15, which is designed as an annular space 21, lies between the nozzle body 3 and the nozzle needle 4 and is at the same time a fuel inlet for the injection 4 nozzle 2, thereby dispensing with the separate fuel inlet in the injector. The highpressure connection 10 formed laterally onto the injector 1 opens into the upper-lying region of the annular space 21. From this annular space 21 there leads away a control line 22, which is provided with a restrictor 20 and opens into the control chamber 8.
The nozzle needle 4 has in the region on the combustion chamber side for example bar-like needle guides 23 and, downstream of these parts, a pressure shoulder 24 bounding the pressure chamber 14.
The high-pressure accumulator 15 is formed in Figure 4 by the highpressure connection 10 itself, arranged on the injector 1, and represents an elongated hollow body receiving the storage volume.
The high-pressure connections 10 of the neighbouring injectors 1 are connected to one another by the injection lines or connecting lines 11, to be precise the connecting lines 11 may be connected according to Figure 6 to the top of the elongated hollow bodies 10 or according to Figure 5 laterally to these hollow bodies 10, for instance in the longitudinal centre.
in Figure 5, a pressure sensor is denoted by 25 and the high-pressure injection pump is denoted by 12. A connection line 26 on the highpressure injection pump 12 may be optionally connected either to the centrally situated injector 1 of a series of injectors or, according to Figure 6, to the first injector 1 of the series of injectors, in order to achieve an even distribution over the injectors from the highpressure injection pump.

Claims (9)

Claim
1. A fuel injection system for a diesel internal combustion engine, having a high-pressure injection pump, which pumps the fuel into a high-pressure accumulator, and having solenoid-valve-controlled injectors, which are flow connected to the high-pressure accumulator and each of which has an injection nozzle with a nozzle needle as well as a control plunger, interacting with the latter and bounding a control chamber, and a solenoid valve controlling the pressure relief in the control chamber, and also having a fuel inlet running in the injector to the needle seat of the nozzle needle, wherein a storage volume of the high-pressure accumulator is provided at each injector and the storage volumes of the injectors are connected to one another by connecting lines.
2. t fuel injection system according to Claim 1, in which there is arranged laterally on each injector ahigh-pressure connection and in each injector a valve piece of the solenoid valve, which partially surrounds the control plunger and has in this region a passage to the control chamber, wherein the part of the valve piece surrounding the control plunger together with the injector housing forms an annular intermediate space which receives the storage volume, and is connected to the high pressure connection and from which there leads the fuel inlet to the needle seat of the nozzle needle.
3. A fuel injection system according to Claim 1, in which each injector has a high-pressure connection protruding laterally from it, wherein each high pressure connection contains a storage volume.
4. A fuel injection system according to Claim 3, wherein each high pressure connection containing the storage volume comprises an elongated hollow body to the top of which the connecting line is connected at its end facing away from the injector.
5. A fuel injection system according to Claim 3, wherein each highpressure connection containing the storage volume comprises an elongated hollow 6 body of which the lateral region is provided as a connection for connecting the connecting line.
6. A fuel injection system according to Claim 1, in which a high-pressure connection is arranged laterally on each injector, wherein an annular space intended for the storage volume and connected to the high-pressure connection is formed between the nozzle needle and the nozzle body and is in connection with the control chamber via a control line running in the injector housing.
7. A fuel injection system according to Claim 1 or 6, wherein the annular space is at the same time a high-pressure inlet.
8. A fuel injection system according to any one of the preceding claims, wherein a connection line leading away from the high-pressure injection pump is connected to an at least approximately centrally situated injector of a series of injectors or to a first injector of a series of injectors.
9. A fuel injection system for a diesel internal combustion engine, substantially as described herein with reference to, and as illustrated in, the accompanying drawings.
GB9921494A 1998-09-15 1999-09-10 Fuel injection system for a diesel internal combustion engine Expired - Fee Related GB2341637B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19842067A DE19842067A1 (en) 1998-09-15 1998-09-15 Fuel injection system for diesel internal combustion engine has accumulator associated directly with each injector to eliminate fuel pressure fluctuations

Publications (3)

Publication Number Publication Date
GB9921494D0 GB9921494D0 (en) 1999-11-17
GB2341637A true GB2341637A (en) 2000-03-22
GB2341637B GB2341637B (en) 2000-08-16

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GB9921494A Expired - Fee Related GB2341637B (en) 1998-09-15 1999-09-10 Fuel injection system for a diesel internal combustion engine

Country Status (4)

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DE (1) DE19842067A1 (en)
FR (1) FR2783284A1 (en)
GB (1) GB2341637B (en)
IT (2) IT1309055B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100365269C (en) * 2002-03-08 2008-01-30 罗伯特·博施有限公司 Device for injecting fuel to stationary internal combustion engine
US8336524B2 (en) 2007-09-13 2012-12-25 Ganser-Hydromag Ag Fuel injection device
EP4030049A1 (en) 2021-01-14 2022-07-20 Wärtsilä Finland Oy A common rail fuel injection system for a multicylinder internal combustion piston engine, method of upgrading a fuel injection system in a multicylinder internal combustion piston engine and an internal combustion piston engine

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Publication number Priority date Publication date Assignee Title
DE10036868B4 (en) * 2000-07-28 2004-07-29 Robert Bosch Gmbh Injector for an injection system comprising a high-pressure plenum
DE10114219A1 (en) * 2001-03-23 2002-09-26 Bosch Gmbh Robert Fuel injection system has high pressure pump via which fuel injectors are supplied with fuel at high pressure and storage volume arranged immediately before each individual fuel injector
DE10121892A1 (en) * 2001-05-05 2002-11-07 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE10147830B4 (en) * 2001-09-27 2008-05-08 L'orange Gmbh fuel injector
FI116158B (en) * 2002-04-08 2005-09-30 Waertsilae Finland Oy Piston engine fuel supply system
FI117349B (en) * 2002-08-02 2006-09-15 Waertsilae Finland Oy Fuel supply system
FR2845130B1 (en) 2002-09-30 2006-04-28 Delphi Tech Inc HIGH PRESSURE FUEL INJECTION SYSTEM EQUIPPED WITH EQUIPMENT AND PRESSURE WAVE ATTENUATION SOFTWARE
DE10348926B4 (en) * 2003-10-18 2016-05-12 Robert Bosch Gmbh Fuel injector for storage injection systems
EP1612405B1 (en) * 2004-06-30 2008-11-05 C.R.F. Società Consortile per Azioni An injection system for an internal-combustion engine
US7603984B2 (en) 2005-07-18 2009-10-20 Ganser-Hydromag Ag Accumulator injection system for an internal combustion engine
DE102005062549A1 (en) * 2005-12-27 2007-07-05 Robert Bosch Gmbh Fuel injector for internal combustion engine has control valve fully integrated into fuel injector, high pressure fuel storage device connected to control chamber and integrated into fuel injector
DE102007025617A1 (en) * 2007-06-01 2008-12-04 Robert Bosch Gmbh Fuel injector with low wear
DE102007039893B4 (en) * 2007-08-23 2013-05-08 Continental Automotive Gmbh Injection system for an internal combustion engine
JP4894804B2 (en) * 2008-03-28 2012-03-14 株式会社デンソー Fuel injection valve
FI20115126L (en) * 2011-02-09 2012-08-10 Waertsilae Finland Oy Fuel injection system

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GB2110300A (en) * 1981-11-27 1983-06-15 Lucas Ind Plc Fuel injection system for a compression ignition engine
JPH1030521A (en) * 1996-07-12 1998-02-03 Denso Corp Fuel injector
WO1998042978A1 (en) * 1997-03-22 1998-10-01 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Fuel-injection system for an internal combustion engine

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US5148987A (en) * 1990-07-05 1992-09-22 Yamaha Hatsudoki Kabushiki Kaisha High pressure fuel injection device for engine
US5467757A (en) * 1993-08-20 1995-11-21 Toyota Jidosha Kabushiki Kaisha Compression-ignition type engine and combustion method of same
DE4341546A1 (en) * 1993-12-07 1995-06-08 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE19544241A1 (en) * 1994-12-10 1996-06-13 Volkswagen Ag Quiet=running HP fuel injection system

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Publication number Priority date Publication date Assignee Title
GB2110300A (en) * 1981-11-27 1983-06-15 Lucas Ind Plc Fuel injection system for a compression ignition engine
JPH1030521A (en) * 1996-07-12 1998-02-03 Denso Corp Fuel injector
WO1998042978A1 (en) * 1997-03-22 1998-10-01 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Fuel-injection system for an internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100365269C (en) * 2002-03-08 2008-01-30 罗伯特·博施有限公司 Device for injecting fuel to stationary internal combustion engine
US8336524B2 (en) 2007-09-13 2012-12-25 Ganser-Hydromag Ag Fuel injection device
EP4030049A1 (en) 2021-01-14 2022-07-20 Wärtsilä Finland Oy A common rail fuel injection system for a multicylinder internal combustion piston engine, method of upgrading a fuel injection system in a multicylinder internal combustion piston engine and an internal combustion piston engine

Also Published As

Publication number Publication date
ITRM990557A0 (en) 1999-09-06
ITRM990556A1 (en) 2001-03-06
GB9921494D0 (en) 1999-11-17
FR2783284A1 (en) 2000-03-17
IT1309055B1 (en) 2002-01-16
GB2341637B (en) 2000-08-16
ITRM990557A1 (en) 2001-03-06
DE19842067A1 (en) 2000-03-16
ITRM990556A0 (en) 1999-09-06
IT1309056B1 (en) 2002-01-16

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030910