EP1218631A2 - Pressure amplifier and a fuel injection system with a pressure amplifier - Google Patents
Pressure amplifier and a fuel injection system with a pressure amplifierInfo
- Publication number
- EP1218631A2 EP1218631A2 EP00979424A EP00979424A EP1218631A2 EP 1218631 A2 EP1218631 A2 EP 1218631A2 EP 00979424 A EP00979424 A EP 00979424A EP 00979424 A EP00979424 A EP 00979424A EP 1218631 A2 EP1218631 A2 EP 1218631A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- booster
- injection
- piston
- spring
- 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
-
- 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
- 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
Definitions
- the invention relates to a pressure booster for increasing the injection pressure in direct-injection internal combustion engines, in particular diesel engines, with a booster piston, which has a relatively large end face, which is acted upon by a relatively low pressure, and a relatively small end face, on which in
- the invention also relates to a fuel injection system, in particular a common rail system, with a high-pressure connection, which is connected to an injector, from which fuel is injected into the combustion chamber of an internal combustion engine.
- Both pressure-controlled (DE 197 06 467 Cl) and stroke-controlled (DE 196 19 523 AI) injection systems are known for introducing fuel into direct-injection diesel engines. It is advantageous if the injection pressure is adapted to the load and speed, as can be the case with a common rail system.
- a high-pressure pump possibly with the help of a pre-feed pump, conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail. Lead off the rail
- the injectors are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine.
- the maximum injection pressures in common rail systems are currently limited to approx. 1600 to 1800 bar due to the high pressure resistance of pressure accumulators and high pressure pumps.
- injection systems with pressure intensifiers are used.
- Such a common rail system is e.g. described in EP 0 562 046 B1. It is a pressure-controlled common rail system with a pressure intensifier
- Booster piston during injection pressure increased t P> o L ⁇ oo in
- Booster piston which has a relatively large end face, which is subjected to a relatively low pressure, and a relatively small end face, on which there is an increased injection pressure in the delivery stroke, the difference in size between the two on the side facing away from the relatively large end face
- the end faces of the booster piston result in a dead volume, solved in that the dead volume is connected to an outsourced spring accumulator that is local to each individual cylinder or central to all cylinders of the
- Diameter ratios can be achieved.
- a further advantage can arise in a central storage space / diaphragm space common to all cylinders, since the reset can be realized with a few additional components (if a reset was simply carried out using a pre-pressure on the high-pressure side, this pressure would only have to be generated, which would reduce the efficiency ).
- a special embodiment of the invention is characterized in that the spring accumulator comprises a piston which is biased by a spring.
- the maximum injection pressure is reduced accordingly by the spring, but this benefits rapid refilling.
- a small spring may also be arranged in the dead space, which further supports refilling.
- a special embodiment of the fuel injection system according to the invention is characterized in that the pressure booster is integrated in the injector. In a common rail system, the pressure booster can also be integrated into the rail.
- such an arrangement can also be used in other injection systems which have such a pressure booster.
- a pressure booster for example, in the case of a distributor pump, the 3/2 valve upstream of the pressure booster is omitted and is replaced by a distributor with the corresponding 2/2 valve.
- a pressure booster 1 according to the invention is shown by way of example in the accompanying drawing.
- the pressure booster 1 comprises a cylinder 2, in which a booster piston 3 is received.
- the booster piston 3 can be moved back and forth in the cylinder 2 between a low-pressure side 4 and a high-pressure side 5.
- Low pressure side 4 is actually high pressure, which is provided by a high pressure pump.
- the booster piston 3 has two differently sized end faces. The end face of the booster piston 3 on the low-pressure side 4 is larger than the end face on the high-pressure side 5. This means that the pressure on the high-pressure side 5 increases when the piston moves from the low-pressure side 4 to the high-pressure side 5.
- Two lines 6 and 7 extend from the low-pressure side 4 of the cylinder 2.
- the line 6 is over a
- 3/2-way valve 8 can be connected to a high-pressure connection 9 or an unpressurized leak return 10.
- the line 6 In the position shown of the 3/2 way valve 8, the line 6 is connected to the leakage return 10. In this state, the cylinder 2 is filled with fuel on the high-pressure side 5.
- the line 6 In the other position of the 3/2-way valve 8, the line 6 is connected to a central high-pressure fuel reservoir (rail) via the high-pressure connection 9. In this state, the delivery stroke takes place, during which the fuel located on the high pressure side 5 is compressed.
- Line 7 is connected against the biasing force of a spring-loaded check valve 11 with two lines 12 and 13.
- Line 12 leads to
- High-pressure side 5 of the cylinder 2 ensures that fuel can reach the high-pressure side 5 when refilling.
- the line 13 leads to a nozzle chamber 14 of an injector 15.
- a nozzle needle 16 is received so as to be able to move back and forth against the biasing force of a nozzle spring 17.
- fuel becomes from the nozzle chamber 14 into the combustion chamber 18 of the engine to be supplied injected.
- a dead volume 20 is provided in the cylinder 2.
- the dead volume 20 serves to accommodate the collar resulting from the difference in size of the differently sized end faces of the booster piston 3 in the delivery stroke.
- the dead volume 20 is connected to a via a line 21
- Spring 22 connected.
- a piston 23 is accommodated so that it can move back and forth against the biasing force of a compression spring 24.
- the fuel injection system shown enables improved refilling of the pressure booster 1.
- the compression spring 24 is swapped out in the spring accumulator 22.
- the dead volume 20 is pushed out into the spring accumulator 22 and stored there at a defined pressure.
- the spring accumulator 22 can also be designed as a diaphragm accumulator.
- the sketch shown is intended for the use of a pressure-controlled system.
- a stroke-controlled system it is necessary that the line 7 in front of the valve 8 is permanently connected to the line 9 so that the nozzle chamber 14 is permanently under pressure (when the pressure booster is deactivated, under rail pressure).
- Such a stroke-controlled system naturally also requires a pressure accumulator.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19952512 | 1999-10-30 | ||
DE19952512A DE19952512A1 (en) | 1999-10-30 | 1999-10-30 | Pressure booster and fuel injection system with a pressure booster |
PCT/DE2000/003596 WO2001033067A2 (en) | 1999-10-30 | 2000-10-12 | Pressure amplifier and a fuel injection system with a pressure amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1218631A2 true EP1218631A2 (en) | 2002-07-03 |
EP1218631B1 EP1218631B1 (en) | 2005-03-30 |
Family
ID=7927541
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00979424A Expired - Lifetime EP1218631B1 (en) | 1999-10-30 | 2000-10-12 | Pressure amplifier and a fuel injection system with a pressure amplifier |
Country Status (6)
Country | Link |
---|---|
US (1) | US6634336B1 (en) |
EP (1) | EP1218631B1 (en) |
JP (1) | JP2003514169A (en) |
KR (1) | KR100708224B1 (en) |
DE (2) | DE19952512A1 (en) |
WO (1) | WO2001033067A2 (en) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10103089A1 (en) * | 2001-01-24 | 2002-08-08 | Bosch Gmbh Robert | 3/2-way valve |
DE10123914B4 (en) * | 2001-05-17 | 2005-10-20 | Bosch Gmbh Robert | Fuel injection device with pressure booster device and pressure booster device |
EP1399666B1 (en) * | 2001-05-17 | 2006-08-30 | Robert Bosch Gmbh | Fuel injection device |
DE10218904A1 (en) * | 2001-05-17 | 2002-12-05 | Bosch Gmbh Robert | Fuel injection system |
DE10155406A1 (en) * | 2001-11-10 | 2003-05-22 | Bosch Gmbh Robert | Fuel injection device for an internal combustion engine |
DE10155973A1 (en) * | 2001-11-14 | 2003-05-22 | Bosch Gmbh Robert | Fuel injection device for an internal combustion engine |
GB2394001B (en) * | 2001-12-03 | 2004-06-16 | Daimler Chrysler Ag | Injection system operating with pressure intensification |
DE10158951A1 (en) * | 2001-12-03 | 2003-06-12 | Daimler Chrysler Ag | Fuel Injection system for IC engine, operates with pressure conversion, has connection from control chamber and admission chamber to return line passing via common valve connection |
DE10229418A1 (en) * | 2002-06-29 | 2004-01-29 | Robert Bosch Gmbh | Device for damping the needle stroke on fuel injectors |
DE10229412A1 (en) * | 2002-06-29 | 2004-01-29 | Robert Bosch Gmbh | Fuel injector with pressure intensifier for multiple injection |
DE10229419A1 (en) * | 2002-06-29 | 2004-01-29 | Robert Bosch Gmbh | Pressure-translated fuel injector with rapid pressure reduction at the end of injection |
DE10249840A1 (en) * | 2002-10-25 | 2004-05-13 | Robert Bosch Gmbh | Fuel injection device for internal combustion engines |
US7320310B2 (en) * | 2003-04-02 | 2008-01-22 | Robert Bosch Gmbh | Fuel injector provided with provided with a pressure transmitter controlled by a servo valve |
JP4196868B2 (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 |
DE102004018678B4 (en) * | 2004-04-17 | 2017-06-08 | Robert Bosch Gmbh | Pressure control device |
DE102005060552B4 (en) * | 2005-12-17 | 2009-06-10 | Man Diesel Se | Injection device for fuel engines |
JP4600405B2 (en) * | 2007-03-08 | 2010-12-15 | 株式会社デンソー | Injector |
US9157041B2 (en) * | 2007-09-27 | 2015-10-13 | Innospec Limited | Fuel compositions |
JP4662292B2 (en) * | 2008-07-14 | 2011-03-30 | 株式会社日本自動車部品総合研究所 | Fuel injection device |
DE102010008467A1 (en) | 2010-02-18 | 2011-08-18 | Continental Automotive GmbH, 30165 | High pressure fuel injector for an internal combustion engine |
CN102678409B (en) * | 2012-05-21 | 2014-03-26 | 哈尔滨工程大学 | Sequential turbocharging type electronic control common rail oil injection system |
US10337638B2 (en) * | 2014-12-01 | 2019-07-02 | National Oilwell Varco, L.P. | Slow-shift SPM valve |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4344406A (en) * | 1979-08-02 | 1982-08-17 | Gasaver Corp. | Fuel saver |
JPS59141764A (en) * | 1983-02-03 | 1984-08-14 | Nissan Motor Co Ltd | Fuel injection device |
US4691674A (en) * | 1984-10-13 | 1987-09-08 | Diesel Kiki Co., Ltd. | Multistage fuel injection system for internal combustion engines |
JPH0759919B2 (en) * | 1986-04-04 | 1995-06-28 | 日本電装株式会社 | Fuel injection controller for diesel engine |
US5407174A (en) * | 1990-08-31 | 1995-04-18 | Puritan-Bennett Corporation | Proportional electropneumatic solenoid-controlled valve |
RU2085757C1 (en) | 1991-10-11 | 1997-07-27 | Катерпиллар Инк. | Valve and actuator unit for hydraulically operated nozzle with electronic control |
RU2074975C1 (en) * | 1992-12-21 | 1997-03-10 | Акционерное общество закрытого типа "Сибела" | Diesel engine fuel system |
US5368068A (en) * | 1994-01-31 | 1994-11-29 | Suntec Industries Incorporated | Relief valve for the fuel pump of an oil burner |
JP2885076B2 (en) * | 1994-07-08 | 1999-04-19 | 三菱自動車工業株式会社 | Accumulator type fuel injection device |
AU713548B2 (en) * | 1994-10-13 | 1999-12-02 | Nigel Eric Rose | Fluid actuated engines and engine mechanisms |
RU2078244C1 (en) * | 1995-03-24 | 1997-04-27 | Военный автомобильный институт | System to feed and inject fuel into combustion chamber of diesel engine |
DE19619523A1 (en) * | 1996-05-15 | 1997-11-20 | Bosch Gmbh Robert | Fuel injector for high pressure injection |
US5992359A (en) * | 1996-06-13 | 1999-11-30 | Rose; Nigel Eric | Fluid actuated engines and engine mechanisms |
DE19706467C1 (en) * | 1997-02-19 | 1998-03-26 | Daimler Benz Ag | Fuel injector for multi-cylinder IC engines |
US5865156A (en) * | 1997-12-03 | 1999-02-02 | Caterpillar Inc. | Actuator which uses fluctuating pressure from an oil pump that powers a hydraulically actuated fuel injector |
-
1999
- 1999-10-30 DE DE19952512A patent/DE19952512A1/en not_active Ceased
-
2000
- 2000-10-12 WO PCT/DE2000/003596 patent/WO2001033067A2/en active IP Right Grant
- 2000-10-12 KR KR1020017008252A patent/KR100708224B1/en not_active IP Right Cessation
- 2000-10-12 US US09/869,520 patent/US6634336B1/en not_active Expired - Fee Related
- 2000-10-12 EP EP00979424A patent/EP1218631B1/en not_active Expired - Lifetime
- 2000-10-12 JP JP2001535726A patent/JP2003514169A/en not_active Withdrawn
- 2000-10-12 DE DE50009933T patent/DE50009933D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0133067A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001033067A2 (en) | 2001-05-10 |
KR100708224B1 (en) | 2007-04-17 |
JP2003514169A (en) | 2003-04-15 |
EP1218631B1 (en) | 2005-03-30 |
US6634336B1 (en) | 2003-10-21 |
WO2001033067A3 (en) | 2002-04-25 |
DE19952512A1 (en) | 2001-05-10 |
KR20010093232A (en) | 2001-10-27 |
DE50009933D1 (en) | 2005-05-04 |
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