WO2001027464A1 - Common-rail fuel injection system - Google Patents
Common-rail fuel injection system Download PDFInfo
- Publication number
- WO2001027464A1 WO2001027464A1 PCT/DE2000/003242 DE0003242W WO0127464A1 WO 2001027464 A1 WO2001027464 A1 WO 2001027464A1 DE 0003242 W DE0003242 W DE 0003242W WO 0127464 A1 WO0127464 A1 WO 0127464A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- injection system
- fuel injection
- common rail
- low
- Prior art date
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
- 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
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- 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
- 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
- F02M63/02—Fuel-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
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
- F04B9/107—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber rectilinear movement of the pumping member in the working direction being obtained by a single-acting liquid motor, e.g. actuated in the other direction by gravity or a spring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
Definitions
- the invention relates to a common rail fuel injection system for internal combustion engines, with a high-pressure fuel reservoir for supplying a plurality of injectors which are used to inject fuel into the combustion chamber of the internal combustion engine.
- Such a common rail fuel injection system is e.g. described in DE 197 28 111.
- a high-pressure pump possibly with the aid of a prefeed pump, conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as a common rail.
- Fuel lines run from the rail to the individual injectors, which are the cylinders of the
- the injectors are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine.
- High-pressure fuel accumulators separate the pressure generation and the injection from each other.
- the object of the invention is to improve the known common rail fuel injection system in such a way that the stress on the high pressure pump is reduced.
- the common rail fuel injection system according to the invention should be simple in construction and inexpensive to manufacture.
- the task is with a Com on Rail
- Fuel injection system for internal combustion engines with a high-pressure fuel reservoir for supplying a plurality of injectors which serve to inject fuel into the combustion chamber of the internal combustion engine, in that the high-pressure fuel reservoir is hydraulically coupled to a low-pressure reservoir via a hydraulic transmission device.
- the low-pressure accumulator can be used to generate high-pressure fuel.
- a high-pressure pump as used in conventional common rail fuel injection systems, can be dispensed with entirely.
- a special embodiment of the invention is characterized in that the hydraulic transmission device comprises at least one transmission piston, the end face of which is larger on the primary side subjected to low pressure than the end face of which is on the opposite secondary side.
- the booster piston is a simply constructed booster device through which the fuel can be subjected to high pressure.
- the low pressure side of the common rail fuel injection system according to the invention is separated from the high pressure side by the booster piston.
- Another special embodiment of the invention is characterized in that the secondary side of the Translator piston with the interposition of a first check valve with a fuel inlet and with the interposition of a second check valve with the high-pressure fuel accumulator in connection.
- fuel is drawn from the fuel supply via the first check valve on the secondary side.
- the fuel drawn in is subjected to high pressure in the delivery stroke of the booster piston and reaches the high-pressure fuel reservoir via the second check valve.
- a further special embodiment of the invention is characterized in that a plurality of booster pistons are connected in parallel, an actuating device being arranged between the booster piston and the low-pressure accumulator. With several booster pistons, a large amount of fuel can be subjected to high pressure. The conveying work of the translation pistons is coordinated by the actuating device.
- a further special embodiment of the invention is characterized in that the actuating device is formed by a 3/2 way valve, which forms the primary side of the associated booster piston in the first switching position with the low-pressure accumulator and in the second
- Switch position connects with a fuel drain.
- the primary side of the associated booster piston is subjected to low pressure and the delivery stroke is carried out.
- the second switching position of the adjusting device the associated one moves
- the booster piston for example supported by the biasing force of a spring, returns to its starting position.
- the fuel displaced in the suction stroke on the primary side of the associated booster piston can escape via the fuel outlet.
- a further special embodiment of the invention is characterized in that the actuating devices are controlled in such a way that at least one booster piston is constantly in the delivery stroke. This ensures that in the common rail according to the invention
- Fuel injection system pressure and quantity are continuously promoted.
- Another particular embodiment of the invention is characterized in that the low-pressure accumulator is supplied with oil via a feed pump. This has the advantage that the pumped medium can also be used to lubricate the pump. A separate lubrication circuit is not necessary.
- a further special embodiment of the invention is characterized in that further hydraulically actuable components, such as braking devices, hydraulic valve controls, etc., are connected to the low-pressure accumulator.
- further hydraulically actuable components such as braking devices, hydraulic valve controls, etc.
- the fuel injection system can be integrated into the oil hydraulic management of the internal combustion engine.
- FIG. 1 A hydraulic circuit diagram is shown in simplified form in FIG. 1 in order to illustrate the common rail fuel injection system according to the invention.
- Feed pump 1 sucks from a (not shown) Hydraulic oil reservoir on.
- the suctioned hydraulic oil is conveyed by the feed pump 1 via a line 2 into a low-pressure accumulator 3.
- the low-pressure accumulator 3 is connected to a hydraulic valve control (not shown) via a line 4 shown as an example.
- a pressure of 100-300 bar prevails in the low-pressure accumulator 3.
- the low pressure accumulator 3 can also be connected to a hydraulic brake system.
- the low-pressure accumulator 3 is connected to two actuating devices 7, 8 via two lines 5, 6.
- the actuating devices 7, 8 are 3/2 directional valves.
- valve member 9, 10 is received in a reciprocating manner.
- the valve member 9, 10 is displaceable between a first valve seat 11, 12 and a second valve seat 13, 14.
- Valve seat 13, 14 is in contact, the line 5, 6 coming from the low-pressure accumulator 3 is connected to a line 17, 18.
- the line 17, 18 opens into a cylinder 19, 20.
- a booster piston 21, 22 is received in a reciprocating manner.
- a plunger 31, 32 is formed on the secondary side 27, 28 of the cylinder 19, 20 on the booster piston 21, 22.
- the plunger 31, 32 projects into a fuel line 33, 34.
- the primary-side end surface 25, 26 of the booster piston 21, 22, like the secondary-side end surface 45, 46 of the plunger 31, 32, is circular.
- the primary end face 25, 26 of the booster piston 21, 22 is significantly larger than the secondary end face 45, 46 of the tappet 31, 32. This ensures that the low pressure prevailing on the primary side 23, 24 prevails in the secondary side 27, 28 High pressure is translated.
- a check valve 39, 40 arranged at the end of the fuel line 33, 34 opens, and the high-pressure fuel reaches a high-pressure fuel reservoir 41.
- the high-pressure fuel reservoir 41 is in turn over
- High-pressure fuel lines 42 connected to the injectors of the internal combustion engine.
- the booster piston 21, 22 moves against the biasing force of the spring 29, 30 from the primary side 23, 24 to the secondary side 27, 28 of the cylinder 19, 20.
- the actuating device 7 switches , 8, and the valve member 9, 10 moves from the second valve seat 13, 14 to the first valve seat 11, 12.
- the valve member 9, 10 is in contact with the first valve seat 11, 12, the line 17, 18 with a fuel drain 15, 16 in connection. In this valve position, the fuel contained in the fuel line 17, 18 can escape into the fuel outlet 15, 16.
- the associated pressure loss in the line 17, 18 and the biasing force of the spring 29, 30 ensure that the booster piston moves from the secondary side 27, 28 to the primary side 23, 24 of the cylinder 19, 20.
- the movement of the two booster pistons 21, 22 is coordinated via a control device (not shown) in such a way that the booster piston 22 delivers first. Shortly before the booster piston 22 reaches its stroke stop, the booster piston 21 begins to deliver.
- the coordination of the delivery and suction stroke movement of the booster pistons 21, 22 ensures that a sufficient amount of fuel is continuously supplied with high pressure and delivered to the high pressure accumulator 41.
- the booster pistons 21, 22 ensure that high pressure is generated on the secondary side 27, 28 from the low pressure on the primary side 23, 24.
- the check valve 37, 38 is used for refilling.
- the check valves 39, 40 serve to maintain the pressure in the high-pressure fuel accumulator 41.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00978945A EP1144856A1 (en) | 1999-10-08 | 2000-09-19 | Common-rail fuel injection system |
KR1020017007019A KR20010080693A (en) | 1999-10-08 | 2000-09-19 | Common-rail fuel injection system |
JP2001529578A JP2003511624A (en) | 1999-10-08 | 2000-09-19 | Common rail fuel injector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19948464A DE19948464A1 (en) | 1999-10-08 | 1999-10-08 | Common rail fuel injection system |
DE19948464.3 | 1999-10-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001027464A1 true WO2001027464A1 (en) | 2001-04-19 |
Family
ID=7924914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/003242 WO2001027464A1 (en) | 1999-10-08 | 2000-09-19 | Common-rail fuel injection system |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1144856A1 (en) |
JP (1) | JP2003511624A (en) |
KR (1) | KR20010080693A (en) |
CZ (1) | CZ20011997A3 (en) |
DE (1) | DE19948464A1 (en) |
WO (1) | WO2001027464A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4608554B2 (en) | 2005-02-22 | 2011-01-12 | シーメンス ヴィディーオー オートモーティヴ コーポレイション | Fuel system with pressure amplification function |
DE102005044046B4 (en) | 2005-09-15 | 2007-01-18 | Adrian Verstallen | Device for producing a diesel-oil-water microemulsion and for injecting this emulsion into a diesel engine |
CN102619739B (en) * | 2012-04-09 | 2015-04-15 | 台州巨力工具有限公司 | Variable plunger pump |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19646581A1 (en) * | 1996-11-12 | 1998-05-14 | Bosch Gmbh Robert | Fuel injection system |
US5823429A (en) * | 1996-07-12 | 1998-10-20 | Servojet Products International | Hybrid hydraulic electronic unit injector |
DE19716221A1 (en) * | 1997-04-18 | 1998-10-22 | Bosch Gmbh Robert | Fuel injection device with pre and main injection in internal combustion engines, especially for fuels that are difficult to ignite |
DE19728111A1 (en) | 1997-07-02 | 1999-01-07 | Bosch Gmbh Robert | Fuel injection system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3100725A1 (en) * | 1980-12-16 | 1982-07-01 | Gebrüder Sulzer AG, 8401 Winterthur | Device for the controlled delivery of fuel in an internal combustion engine |
DE3133288A1 (en) * | 1981-08-22 | 1983-03-03 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg | Fuel injection system on an internal combustion engine |
-
1999
- 1999-10-08 DE DE19948464A patent/DE19948464A1/en not_active Ceased
-
2000
- 2000-09-19 EP EP00978945A patent/EP1144856A1/en not_active Withdrawn
- 2000-09-19 KR KR1020017007019A patent/KR20010080693A/en not_active Application Discontinuation
- 2000-09-19 WO PCT/DE2000/003242 patent/WO2001027464A1/en not_active Application Discontinuation
- 2000-09-19 CZ CZ20011997A patent/CZ20011997A3/en unknown
- 2000-09-19 JP JP2001529578A patent/JP2003511624A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5823429A (en) * | 1996-07-12 | 1998-10-20 | Servojet Products International | Hybrid hydraulic electronic unit injector |
DE19646581A1 (en) * | 1996-11-12 | 1998-05-14 | Bosch Gmbh Robert | Fuel injection system |
DE19716221A1 (en) * | 1997-04-18 | 1998-10-22 | Bosch Gmbh Robert | Fuel injection device with pre and main injection in internal combustion engines, especially for fuels that are difficult to ignite |
DE19728111A1 (en) | 1997-07-02 | 1999-01-07 | Bosch Gmbh Robert | Fuel injection system |
Also Published As
Publication number | Publication date |
---|---|
KR20010080693A (en) | 2001-08-22 |
DE19948464A1 (en) | 2001-04-12 |
EP1144856A1 (en) | 2001-10-17 |
CZ20011997A3 (en) | 2002-05-15 |
JP2003511624A (en) | 2003-03-25 |
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