EP1397593A1 - Fuel injection device with a pressure booster - Google Patents
Fuel injection device with a pressure boosterInfo
- Publication number
- EP1397593A1 EP1397593A1 EP02742762A EP02742762A EP1397593A1 EP 1397593 A1 EP1397593 A1 EP 1397593A1 EP 02742762 A EP02742762 A EP 02742762A EP 02742762 A EP02742762 A EP 02742762A EP 1397593 A1 EP1397593 A1 EP 1397593A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel
- piston
- injection device
- pressure booster
- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
- F02M57/026—Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M55/002—Arrangement of leakage or drain conduits in or from 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
Definitions
- the invention relates to a fuel injection device according to the preamble of patent claim 1.
- the fuel injection device according to the invention can be designed both stroke-controlled and pressure-controlled.
- the fuel injection device according to the invention can be designed both stroke-controlled and pressure-controlled.
- Fuel einspritzeinrichtunq understood that the opening and closing of the injection port by means of a displaceable nozzle needle due to the hydraulic interaction of the fuel pressures is effected in a nozzle chamber and • in a control chamber. A pressure drop within the control room causes the nozzle needle to lift. Alternatively, the nozzle needle can be deflected by an actuator (actuator, actuator). In a pressure-controlled fuel injection device according to the invention, the nozzle needle is moved by the fuel pressure prevailing in the nozzle space of an injector against the action of a closing force (spring), so that the injection opening is released for an injection of the fuel from the nozzle space into the cylinder.
- actuator actuator
- the pressure with which fuel emerges from the nozzle chamber into a cylinder of an internal combustion engine is referred to as the injection pressure, while a system pressure is understood to mean the pressure under which fuel is available or is stored within the fuel injection device.
- Fuel metering means to provide a defined amount of fuel 'for injection. Leakage is to be understood as an amount of fuel that arises during operation of the fuel injection device (for example a guide leakage), is not used for injection and is returned to the fuel tank. ⁇
- the pressure level of this leakage can have a static pressure, the fuel then being expanded to the pressure level of the fuel tank.
- Many engine manufacturers require a flat pressure rise edge at the start of injection. A boot phase to reduce emissions is also often desired.
- the pressure booster can be used to shape the course of the injection. In this way, the desired injection process can be implemented without additional parts, such as evasive pistons.
- the movement of the piston of the pressure booster can be used to influence the pressure curve.
- the stroke-dependent influencing of the inlet cross-section to the low-pressure side pressure booster chamber is known from US Pat. No. 5,568,31 7. Through the US PS. a multi-stage control of the inlet cross-section proposed.
- Fig. 1 is a stroke-controlled fuel injection device with a
- Fig. 2 shows a first continuous change flow cross-section
- Fig. 3 shows a second continuous change in the flow cross-section.
- a quantity-controlled fuel pump conveys fuel from a storage tank via a delivery line into a central pressure storage space (common rail), from which a plurality of pressure lines 2 corresponding to the number of individual cylinders to the individual, discharge into the combustion chamber of the injectors 3 (injection device) projecting. Only one of the injectors 3 is shown in FIG. 1.
- a first system pressure is generated and stored in the pressure storage space. This first system pressure is used for pre-injection and, if necessary, for post-injection (HC enrichment for exhaust gas aftertreatment or soot reduction) as well as for displaying an injection curve with a plateau (boat injection).
- each injector 3 is assigned a local pressure booster 4 with a check valve 5 and with a displaceable piston 6.
- Such fuel injection devices are known, for example, from DE-A1-1 9910970.
- the pressure in the differential space 7 formed by a transition from a larger to a smaller piston cross-section is used to control the pressure booster 4.
- the differential space 7 is supplied with a supply pressure (rail pressure). Then the same pressure conditions (rail pressure) prevail on all pressure surfaces of a piston 6.
- the piston 6 is pressure balanced.
- the piston 6 is pressed into its initial position by an additional spring 8.
- the differential space 7 is relieved of pressure and the pressure booster 4 generates a pressure boost according to the area ratio.
- This type of control can achieve that To reset the pressure booster 4 and to refill a pressure chamber 9, a pressure booster chamber 10 on the pressure side does not have to be depressurized. With a small hydraulic ratio, the relaxation losses can be greatly reduced.
- a throttle 1 1 and a simple 2/2-way valve 1 2 can be used instead of a complex 3/2-way valve.
- the throttle 1 1 ' connects the differential space 7 with fuel under supply pressure from a pressure storage space.
- the 2/2-way valve 12 connects the differential space 7 to a leakage line 13.
- the throttle 1 1 should be designed as small as possible, but still so large that the piston 6 returns to its starting position between the injection cycles.
- a guide leakage of the piston 6 can also be used as a throttle.
- the throttle can also be integrated in the piston.
- the injector 3 is under the pressure of the pressure storage space.
- the pressure booster 4 is in the starting position. Injection with rail pressure can now take place through valve 1 4. If an injection with higher pressure is desired, the 2/2-way valve 1 2 is activated (opened) and a pressure boost is achieved.
- the injection takes place via a fuel metering by means of an axially displaceable in a guide bore of the nozzle needle 15 having a conical valve sealing face at its one end, with which it cooperates with a valve seat surface on the injector housing of the injector •.
- 3 Injection openings are provided on the valve seat surface of the injector housing.
- a pressure surface pointing in the opening direction of the nozzle needle 15 is exposed to the pressure prevailing there, which is supplied to the nozzle space 16 via a pressure line.
- a pressure piece 18 also acts on the nozzle needle 15, the end face of the control chamber facing away from the valve sealing surface. 19 limited.
- the control room 1 9 has from Fuel pressure connection forth an inlet with a first throttle and an outlet to a pressure relief line 20 with a second throttle, which is controlled by the 2/2-way valve 14.
- Fuel under the first or second system pressure constantly fills the nozzle chamber 1 6 and the control chamber 1 9.
- the pressure in the control chamber 1 9 can be reduced, so that in consequently the pressure force acting in the opening direction on the nozzle needle 1 5 in the nozzle space 1 6 and the pressure force acting in the closing direction on the nozzle needle 1 5.
- the valve sealing face lifts off from the valve seat and fuel ⁇ • is injected.
- the pressure relief process of the control chamber 1 9 and thus the stroke control of the nozzle needle 15 can be influenced via the dimensioning of the throttles.
- the discharge cross-section of the differential chamber 7 is designed in several stages; in the initial position of the piston 6, only the discharge path 21 is open. As a result, when the valve 1 2 is opened, there is a slow pressure drop within the differential space 7, a damped movement of the piston 6 and a slow pressure increase in the pressure chamber 9
- a continuous cross-sectional enlargement can also be used be formed (Figs. 2 and 3) .
- a uniform, flat pressure rise can be achieved without disturbing pressure vibrations.
- a piston is only a partial surface 25 of a ⁇ slit-shaped opening released 24 (longitudinal direction of the opening and the piston) according to the position of the piston 24 26 to 'a control edge 24' by the direction of movement 23 and a partial surface 27 of the opening 26 covered.
- the opening 26 in the wall surface of the differential space connects the differential space 7 (see FIG. 1) to the leakage line (see FIG. 1) and can be closed by the piston.
- FIG. 3 has a slot-shaped aperture 28 in the 'wall surface of a pressure intensifier space to a variable in the direction of movement 23 of the piston 30 cross sectional area.
- the piston 30 itself has a recess 31 which creates the continuous connection of the differential space 7 (see FIG. 1) to the leakage line.
- the recess 31 forms a kind of control window that slides along the slot 28.
- the discharge cross-section can be varied as required over the stroke of the piston.
- the slot-shaped opening 28 can also be formed in the piston and the control edge 24 ' or a recess 31 in the wall surface.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10126686 | 2001-06-01 | ||
DE10126686A DE10126686A1 (en) | 2001-06-01 | 2001-06-01 | Fuel injection system, for an IC motor, has a pressure amplifier with a sliding piston and controlled outflow cross section stages to set the fuel pressure according to the piston stroke and give a boot injection action |
PCT/DE2002/001792 WO2002099270A1 (en) | 2001-06-01 | 2002-05-17 | Fuel injection device with a pressure booster |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1397593A1 true EP1397593A1 (en) | 2004-03-17 |
EP1397593B1 EP1397593B1 (en) | 2007-08-15 |
Family
ID=7686869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02742762A Expired - Lifetime EP1397593B1 (en) | 2001-06-01 | 2002-05-17 | Fuel injection device with a pressure booster |
Country Status (5)
Country | Link |
---|---|
US (1) | US6938610B2 (en) |
EP (1) | EP1397593B1 (en) |
JP (1) | JP4126011B2 (en) |
DE (2) | DE10126686A1 (en) |
WO (1) | WO2002099270A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10229412A1 (en) * | 2002-06-29 | 2004-01-29 | Robert Bosch Gmbh | Fuel injector with pressure intensifier for multiple injection |
DE10249523C5 (en) * | 2002-10-23 | 2015-12-24 | Minibooster Hydraulics A/S | booster |
DE10251932B4 (en) * | 2002-11-08 | 2007-07-12 | Robert Bosch Gmbh | Fuel injection device with integrated pressure booster |
JP4196869B2 (en) * | 2004-03-31 | 2008-12-17 | 三菱ふそうトラック・バス株式会社 | Fuel injection device |
JP4075894B2 (en) * | 2004-09-24 | 2008-04-16 | トヨタ自動車株式会社 | Fuel injection device |
JP2006132467A (en) * | 2004-11-08 | 2006-05-25 | Mitsubishi Fuso Truck & Bus Corp | Common rail type fuel injection device |
JP2007255328A (en) * | 2006-03-23 | 2007-10-04 | Toyota Motor Corp | Injection fuel boosting device |
DE102007002761A1 (en) * | 2007-01-18 | 2008-07-24 | Robert Bosch Gmbh | Fuel injector with integrated pressure booster |
DE102010039051A1 (en) | 2010-08-09 | 2012-02-09 | Robert Bosch Gmbh | Injector |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5754620B2 (en) * | 1973-08-29 | 1982-11-19 | ||
DE2803049A1 (en) | 1978-01-25 | 1979-08-09 | Bosch Gmbh Robert | PUMP NOZZLE FOR COMBUSTION MACHINES |
GB2150643B (en) | 1983-12-02 | 1987-06-17 | Cummins Engine Co Inc | Unit fuel injector having independently controlled timing and metering |
CH671073A5 (en) * | 1986-09-09 | 1989-07-31 | Nova Werke Ag | |
JP2615108B2 (en) | 1987-12-25 | 1997-05-28 | 株式会社古川製作所 | Rotary bag opening unit |
DE3843162A1 (en) * | 1988-12-22 | 1990-06-28 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
DE4004610A1 (en) | 1989-04-21 | 1990-10-25 | Bosch Gmbh Robert | FUEL INJECTION SYSTEM, IN PARTICULAR PUMP JET, FOR COMBUSTION MACHINES |
US5492098A (en) * | 1993-03-01 | 1996-02-20 | Caterpillar Inc. | Flexible injection rate shaping device for a hydraulically-actuated fuel injection system |
US5459611A (en) | 1993-08-18 | 1995-10-17 | Hewlett-Packard Company | Beam splitter/combiner with path length compensator and method for making the same |
US5517972A (en) * | 1994-11-23 | 1996-05-21 | Caterpillar Inc. | Method and apparatus for rate shaping injection in a hydraulically-actuated electronically controlled fuel injector |
US5954029A (en) * | 1995-01-25 | 1999-09-21 | Cummins Engine Company, Inc. | Unit fuel injector having constant start of injection |
JP3477334B2 (en) | 1996-11-29 | 2003-12-10 | 三菱重工業株式会社 | Fuel injection pump and unit injector using the same |
US5730104A (en) * | 1997-02-19 | 1998-03-24 | Caterpillar Inc. | Injection rate shaping device for a fill metered hydraulically-actuated fuel injection system |
US5852997A (en) * | 1997-05-20 | 1998-12-29 | Stanadyne Automotive Corp. | Common rail injector |
US5868317A (en) * | 1997-08-22 | 1999-02-09 | Caterpillar Inc. | Stepped rate shaping fuel injector |
EP1112445B1 (en) * | 1998-09-10 | 2004-05-12 | International Engine Intellectual Property Company, LLC. | Fuel injector |
DE19910970A1 (en) * | 1999-03-12 | 2000-09-28 | Bosch Gmbh Robert | Fuel injector |
DE19916657A1 (en) * | 1999-04-14 | 2000-10-19 | Hydraulik Ring Gmbh | Injector for internal combustion engines, especially diesel engines, injector has preloaded accumulator piston installed in main piston in pressure medium flow path and is movable against spring force |
DE19945785B4 (en) * | 1999-09-24 | 2010-10-07 | Robert Bosch Gmbh | Fuel injection system for internal combustion engines and method for injecting fuel into the combustion chamber of an internal combustion engine |
DE10002273A1 (en) * | 2000-01-20 | 2001-08-02 | Bosch Gmbh Robert | Injection device and method for injecting fluid |
-
2001
- 2001-06-01 DE DE10126686A patent/DE10126686A1/en not_active Ceased
-
2002
- 2002-05-17 US US10/343,215 patent/US6938610B2/en not_active Expired - Fee Related
- 2002-05-17 DE DE50210713T patent/DE50210713D1/en not_active Expired - Lifetime
- 2002-05-17 EP EP02742762A patent/EP1397593B1/en not_active Expired - Lifetime
- 2002-05-17 WO PCT/DE2002/001792 patent/WO2002099270A1/en active IP Right Grant
- 2002-05-17 JP JP2003502362A patent/JP4126011B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO02099270A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002099270A1 (en) | 2002-12-12 |
DE10126686A1 (en) | 2002-12-19 |
DE50210713D1 (en) | 2007-09-27 |
US6938610B2 (en) | 2005-09-06 |
JP4126011B2 (en) | 2008-07-30 |
EP1397593B1 (en) | 2007-08-15 |
JP2004521242A (en) | 2004-07-15 |
US20040089269A1 (en) | 2004-05-13 |
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