EP1297253A1 - Fuel injection device for internal combustion engines - Google Patents
Fuel injection device for internal combustion enginesInfo
- Publication number
- EP1297253A1 EP1297253A1 EP01953802A EP01953802A EP1297253A1 EP 1297253 A1 EP1297253 A1 EP 1297253A1 EP 01953802 A EP01953802 A EP 01953802A EP 01953802 A EP01953802 A EP 01953802A EP 1297253 A1 EP1297253 A1 EP 1297253A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- sealing surface
- injection device
- fuel injection
- control
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/8667—Reciprocating valve
- Y10T137/86694—Piston valve
- Y10T137/8671—With annular passage [e.g., spool]
Definitions
- a fuel injection device known from DE 197 01 879 AI uses an electrically controlled 3/2-way valve to control the injection times and injection quantities.
- Control valve with a control piston guided in an axial through-hole, which alternately connects a high-pressure line leading to an injection valve with a supply line supplying fuel from a high-pressure accumulator (common rail) or with a relief line.
- the through hole is divided into three annular spaces by two valve seats, into which the supply line, the high pressure line and the relief line each open.
- the control piston closes one valve seat during a stroke movement when it releases the other valve seat.
- control piston has two valve sealing surfaces interacting with the valve seats, the distance between them being greater than the distance between the two valve seats. Therefore, the supply line, ie the high-pressure side, is also briefly connected directly to the relief line, ie to leakage oil, during a stroke movement of the control piston, so that part of the fuel is diverted via the relief line.
- the quantity that is discharged depends on the pressure prevailing in the high-pressure accumulator and is in some cases considerably higher than the injection quantity.
- control valve can also be used to control the injection cross-section.
- the same valves can advantageously be used to control the injection quantity and the injection cross section.
- Fig. 1 shows a first exemplary embodiment in a schematic overall representation, a control valve used for the injection being shown in enlarged form. ter detailed view is shown;
- Fig. 2 is an enlarged sectional view through the control valve of Fig. 1;
- FIGS. 3 and 4 are diagrams showing opening cross sections of the control valve of FIG. 2 as a function of its stroke movement
- Fig. 5 shows the block diagram of the control valve of Fig. 2;
- Fig. 6 shows a second embodiment in which the control valve of Fig. 2 is used for cross-sectional control of injection valves.
- the first exemplary embodiment of a fuel injection device for internal combustion engines which is designated by 1 in FIG.
- the high-pressure fuel is discharged via supply lines 7 to the individual pressure-controlled injection valves 8 projecting into the combustion chamber of the internal combustion engine to be supplied.
- each injection valve 8 has one electrically actuated control valve 9 in the form of a 3/2-way valve assigned.
- the control valve 9 has an axial through-bore 10 with an upper, middle and lower annular space 11, 12, 13 and as a control valve member a control piston 14 guided in the through-bore 10.
- the supply line 7 opens into the upper annular space 11, and a high-pressure line 15 leads from the central annular space 12, which opens in known manner in the injection valve 8 to an injection cross-section of the injection valve 8 that can be controlled by a valve needle 16 of the injection valve 8.
- the control piston 14 alternately connects the middle annular space 12 to the upper annular space 11 or to the lower annular space 13, from which a relief line 17 leading to the low-pressure space 4 branches off.
- the adjustment movement of the control piston 14 is controlled by a solenoid valve 18 which is controlled by an electrical control device (not shown) which processes a large number of operating parameters of the internal combustion engine to be supplied.
- the middle annular space 12 is separated from the upper annular space 11 by a conical first valve seat 19 and from the lower annular space 13 by a second valve seat 20.
- the cross section of the control piston 14 tapers off its upper end initially via two conical upper ring end faces onto a central piston section 21, opposite which a slide head 22 is widened at its lower end.
- the diameter of the central piston section 21 is in each case smaller than the opening diameter of the upper and lower Valve seat 19, 20.
- the first upper annular end face 23 is provided in the area of the upper annular space 11, and the second upper annular end face forms a first conical valve sealing surface 24, which interacts with the first valve seat 19.
- This first sealing seat which is formed between the valve sealing surface 24 and the first valve seat 19, closes the upper annular space 11 from the central annular space 12.
- the control piston 14 Adjacent to its conical first valve sealing surface 24, the control piston 14 has a further valve sealing surface 25, which is formed by the lower edge of an annular collar 26 is.
- the collar 26 is milled with little play in the first valve seat 19, and its lower edge forms a slide valve together with the first valve seat 19.
- the distance between the valve sealing surface 25 and the first valve sealing surface 24, ie the length of the annular collar, is denoted by hl.
- a second valve sealing surface 27 designed as a valve control edge on the slide head 21 interacts with the second valve seat 20, the second sealing cross section formed between them closing the connection between the middle and the lower annular space 12, 13.
- the closing stroke of the slide valve formed by the second valve seat 20 and the valve sealing surface 27 is designated h.2 and is at most as long as the length hl, ie hl ⁇ h.2.
- the fuel is discharged from the lower annular space 13 into the relief line 17 via a blind bore 29 open to the lower end face 28 of the control piston 14, from which a transverse bore 30 designed as a throttle point leads away and opens into the lower annular space 13.
- a hydraulic working chamber 31 is provided for actuating the control piston 14 and is located in the through bore 10 is delimited by the upper end face 32 of the control piston 14 and to the solenoid valve 18 by an intermediate disk 33.
- a relief duct 34 leading away from the working space 31 is provided, which can be connected to the low-pressure space 4 via the solenoid valve 18 (FIG. 1).
- a fill bore 35 with a transverse opening 36 is provided in the control piston 14, the cross section of which is smaller than the cross section of the relief duct 34 and which therefore forms a throttle point.
- the transverse opening 36 extends below the first annular end face 23 of the control piston 14, so that the working space 31 is connected to the supply line 7 at all times via the filling bore 35.
- the fuel injection device 1 shown in FIGS. 1 and 2 operates in the following manner.
- a high-pressure fuel is built up in the common high-pressure accumulator 6 via the high-pressure fuel pump 2, which continues via the various supply lines 7 to the respective control valves 9.
- the solenoid valve 18 is de-energized before the start of the injection phase, so that the relief channel 34 is closed.
- the working space 31 is filled with high-pressure fuel via the filling hole 35 and presses the control piston 14 against the first valve seat 19 against the first valve seat 19 due to the area ratio between the end face 32 and the first annular end face 23.
- the second sealing cross section between the second valve sealing surface 27 and the second valve seat 20 opened so that the pressure in the high-pressure channel 15 can relax to a certain residual pressure in the relief line 17. If an injection is to take place at the injection valve 8, the solenoid valve 18 is first energized and the relief channel 34 to the low-pressure chamber 4 is thus released. Since the cross section of the relief duct 34 is larger than that of the transverse opening 36 in the filling bore 35, the pressure in the working space 31 relaxes very quickly via the relief duct 34 into the low-pressure space 4
- the ring face 23 of the high fuel pressure is now sufficient to displace the control piston 14.
- the first valve sealing surface 24 first lifts off the first valve seat 19, the valve sealing surface 25 still closing the connection to the central annular space 12 despite this opened first sealing seat.
- the second sealing seal is closed by the valve control edge 27 resting on the second valve seat 20.
- the valve sealing surface 25 releases the first sealing seat, and the fuel under high pressure in the supply line 7 flows at the middle Piston section 21 into the high-pressure channel 15 to the injection valve 8 and lifts the valve needle 16 in a known manner against the restoring force of a valve spring 37 from its needle seat, so that the fuel at the injection valve 8 is injected into the combustion chamber of the internal combustion engine to be supplied via injection openings 38.
- the high-pressure injection at the injection valve 8 is ended by the solenoid valve 18 being de-energized again.
- a closing pressure can build up again in the working space 31 via the filling bore 35, so that the valve sealing surface 25 closes the first valve seat 19 again and the connection of the supply line 7 to the high pressure channel 15 is closed again.
- the second sealing seat between the valve control edge 27 and the second valve seat 20 is opened again, so that the pressure in the high-pressure channel 15 located high fuel pressure very quickly relaxed in the relief line 17, which has a rapid needle closing on the fuel injection valve 8 results.
- FIG. 6 40 designates a second exemplary embodiment of a fuel injection device for internal combustion engines with pressure and cross-section-controlled injection valves 41.
- an injection line 42 leads to each injection valve 41, which in a known manner opens in the injection valve 41 up to an injection cross-section of the injection valve 41 that can be controlled by a valve needle 43 of the injection valve 41.
- the injection is controlled by the control valve 9 in the injection line 42.
- the end face 45 of the nozzle needle 43 facing away from the injection openings 44 of the injection valve 41 delimits a chamber 46 which can be connected to the low-pressure chamber 4 via a relief line 47.
- This connection is controlled hydraulically by a 2/2-way control valve 48, the control line designed as high-pressure line 49 can be connected via the control valve 9 "to a supply line 50 of the high-pressure accumulator 6 or to the relief line 17 Control line, ie when the control valve 9 'is deenergized, the 2/2-way control valve 48 is closed.
- valve needle 43 By energizing the control valve 9, the valve needle 43 is raised from its needle seat against the restoring force of a valve spring 51 via a rise in pressure, so that the fuel at the injection valve 8 via the injection openings 44 into the combustion chamber of the internal combustion engine to be supplied.
Landscapes
- 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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10031278 | 2000-06-27 | ||
DE2000131278 DE10031278A1 (en) | 2000-06-27 | 2000-06-27 | Fuel injection device for internal combustion engines |
PCT/DE2001/002355 WO2002001069A1 (en) | 2000-06-27 | 2001-06-26 | Fuel injection device for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1297253A1 true EP1297253A1 (en) | 2003-04-02 |
EP1297253B1 EP1297253B1 (en) | 2005-12-21 |
Family
ID=7646974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010953802 Expired - Lifetime EP1297253B1 (en) | 2000-06-27 | 2001-06-26 | Fuel injection device for internal combustion engines |
Country Status (5)
Country | Link |
---|---|
US (1) | US6637409B2 (en) |
EP (1) | EP1297253B1 (en) |
JP (1) | JP2004502078A (en) |
DE (2) | DE10031278A1 (en) |
WO (1) | WO2002001069A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10002702A1 (en) * | 2000-01-22 | 2001-08-02 | Bosch Gmbh Robert | Valve for controlling liquids |
DE10141110A1 (en) * | 2001-08-22 | 2003-03-20 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
EP1359316B1 (en) * | 2002-05-03 | 2007-04-18 | Delphi Technologies, Inc. | Fuel injection system |
JP2004301190A (en) * | 2003-03-28 | 2004-10-28 | Aisin Seiki Co Ltd | Hydraulic control device |
FI117644B (en) * | 2003-06-17 | 2006-12-29 | Waertsilae Finland Oy | Arrangement in the fuel supply system |
DE10337574A1 (en) * | 2003-08-14 | 2005-03-10 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
JP2005069135A (en) * | 2003-08-26 | 2005-03-17 | Toyota Motor Corp | Fuel injection device |
ATE397722T1 (en) * | 2005-03-09 | 2008-06-15 | Delphi Tech Inc | VALVE ARRANGEMENT |
WO2010121634A1 (en) * | 2009-04-24 | 2010-10-28 | Fev Motorentechnik Gmbh | Fuel injection apparatus for a combustion engine, combustion engine and method for injection fuel in a combustion engine |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4275865A (en) * | 1977-08-24 | 1981-06-30 | Lucas Industries Limited | Fluid control valves |
DE2759187A1 (en) * | 1977-12-31 | 1979-07-12 | Bosch Gmbh Robert | FUEL INJECTION SYSTEM WITH AT LEAST ONE FUEL INJECTION VALVE, ESPECIALLY FOR LARGE ENGINES |
DE3629751C2 (en) * | 1986-09-01 | 1998-07-02 | Bosch Gmbh Robert | Pre-injection device for internal combustion engines |
US4676273A (en) * | 1986-10-07 | 1987-06-30 | General Motors Corporation | Electro-hydraulic pressure regulating valve |
AT408134B (en) * | 1995-06-06 | 2001-09-25 | Avl Verbrennungskraft Messtech | STORAGE INJECTION SYSTEM FOR DIESEL INTERNAL COMBUSTION ENGINES |
DE19701879A1 (en) * | 1997-01-21 | 1998-07-23 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
DE19709794A1 (en) * | 1997-03-10 | 1998-09-17 | Bosch Gmbh Robert | Valve for controlling liquids |
DE19716221B4 (en) * | 1997-04-18 | 2007-06-21 | Robert Bosch Gmbh | Fuel injection device with pre-injection and main injection in internal combustion engines, in particular for hard to ignite fuels |
DE19742073A1 (en) * | 1997-09-24 | 1999-03-25 | Bosch Gmbh Robert | Fuel injection arrangement for internal combustion engines |
US5975139A (en) * | 1998-01-09 | 1999-11-02 | Caterpillar Inc. | Servo control valve for a hydraulically-actuated device |
US5911245A (en) * | 1998-06-09 | 1999-06-15 | Caterpillar Inc. | Flow force spool valve |
-
2000
- 2000-06-27 DE DE2000131278 patent/DE10031278A1/en not_active Ceased
-
2001
- 2001-06-26 WO PCT/DE2001/002355 patent/WO2002001069A1/en active IP Right Grant
- 2001-06-26 US US10/069,569 patent/US6637409B2/en not_active Expired - Fee Related
- 2001-06-26 EP EP20010953802 patent/EP1297253B1/en not_active Expired - Lifetime
- 2001-06-26 JP JP2002506365A patent/JP2004502078A/en active Pending
- 2001-06-26 DE DE50108471T patent/DE50108471D1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0201069A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20020170535A1 (en) | 2002-11-21 |
JP2004502078A (en) | 2004-01-22 |
WO2002001069A1 (en) | 2002-01-03 |
DE50108471D1 (en) | 2006-01-26 |
US6637409B2 (en) | 2003-10-28 |
DE10031278A1 (en) | 2002-01-17 |
EP1297253B1 (en) | 2005-12-21 |
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Inventor name: GORDON, UWE Inventor name: KLENK, WOLFGANG Inventor name: MACK, MANFRED Inventor name: BRENK, ACHIM |
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