EP1597474A1 - Kraftstoffeinspritzeinrichtung - Google Patents
KraftstoffeinspritzeinrichtungInfo
- Publication number
- EP1597474A1 EP1597474A1 EP04712002A EP04712002A EP1597474A1 EP 1597474 A1 EP1597474 A1 EP 1597474A1 EP 04712002 A EP04712002 A EP 04712002A EP 04712002 A EP04712002 A EP 04712002A EP 1597474 A1 EP1597474 A1 EP 1597474A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- pump
- piston
- pump piston
- pressure
- 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
-
- 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
- F02M59/08—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 two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
-
- 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
-
- 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
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
-
- 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
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
- F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
-
- 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
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
- F02M59/28—Mechanisms therefor
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
Definitions
- the invention relates to a fuel injection device with a fuel pump designed as a double piston pump, which delivers fuel to an injector assigned to it for injection into the combustion chamber of an internal combustion engine.
- a cross section of the nozzle needle is acted upon by the fuel supplied by the fuel pump, which causes an opening force on the nozzle needle in the opening direction.
- the fuel pressure increases during an injection until a maximum pressure is reached and then drops again.
- a double piston pump of the presupposed type which is state of the art per se, has two pump pistons, each pump piston being assigned a control rod with which the start and end of delivery of the respective pump piston can be regulated by rotating the pump piston.
- Double piston pumps of this type have the advantage that large delivery volumes are possible with a small construction volume.
- one of the two pump pistons is used to set the start and end of delivery.
- the fact that both pump pistons deliver in parallel on a common line means that the pump piston, which is not controlled, is delivered before and after delivery. most of the fuel quantity is discharged via the control bores of the controlled pump piston.
- the invention specified in claim 1 is based on the problem of optimizing a fuel injection device containing a double-piston pump with regard to the injection process.
- the double pump on the first pump piston pelkolpump the start of delivery and the delivery end is set on the second pump piston, the second pump piston leading the first pump piston in terms of the start of delivery and the second pump piston lagging the first pump piston in terms of the end of delivery, the fuel delivered by the second pump piston before the start of delivery of the first pump piston via control bores assigned to the first pump piston are discharged, and the fuel delivered by the first pump piston after the delivery end of the second pump piston is discharged via the control openings assigned to the second pump piston.
- a control line is provided which is connected to the first control chambers of all injectors and provides a control pressure which pressurizes the pistons assigned to the nozzle needle in the closing direction for variable adjustment of the force acting in the closing direction on the nozzle needle before the start of an injection depending on engine operating parameters.
- control rod is expediently adjusted as a function of the pressure prevailing in the control line.
- the control rod can be adjusted, for example, hydraulically or electrically by means of an electric motor.
- control pressure present in the control line is expediently used directly for setting the control rod of the pump piston regulating the start of delivery.
- the control pressure present in the control line is expediently set to be higher as a function of operating parameters at low engine speeds than at higher speeds.
- a high, low engine speed speaking control pressure on the first pump piston (70) corresponds to an adjustment of the start of delivery in the EARLY direction
- a low, high speed corresponding control pressure corresponds to an adjustment of the start of delivery in the LATE direction.
- a further control line can be provided with which the closing force acting on the nozzle needle is increased during the injection in order to raise the closing pressure.
- the necessary control pressure can be taken from a bore which is arranged in the pump cylinder of the second pump piston of the double-piston pump which controls the delivery end in order to use the control pressure to act on the nozzle needle in the closing direction before the pressure drop at the delivery end reaches the injection nozzle.
- the first pump piston which can be rotated by the control rod and which cooperates with the control bores, is assigned on the circumference, which is formed with steps.
- the steps are preferably designed in the form of steps and the step width is greater than the diameter of the control bores.
- the control rod (71) is expediently adjusted in steps to match the stepped design of the control edge.
- the control rod (71) can preferably be acted upon by step-wise variable control pressure for stepwise adjustment.
- FIG. 1 shows an injection system with injectors that can be adjusted with respect to the opening and closing pressure, to which a double-piston fuel pump is assigned in each case;
- FIG. 2 shows a pump piston with a stepped control edge, as can be used for the gradual adjustment of the start of injection in the double-piston fuel pump.
- FIG. 1 shows a fuel injection device with two injectors 5, each of which is assigned a double-piston pump 1.
- the pump pistons 70, 73 of the fuel pump 1 are each driven by a cam, which is not shown, however. Due to the delivery characteristics of the fuel pump, the pressure in an injection line 4, which is connected to the feed line 6 of an injector 5, increases until a maximum value is reached and then drops again at the end.
- the injectors 5 are pressure-controlled, that is to say that the injection is controlled by the application of fuel pressure to a nozzle chamber 11 which acts on a collar of the nozzle needle 12 which is an annular surface which lies between the sealing seat diameter and the nozzle needle guide diameter.
- control line 9 is shown in the figure, which leads via first 7 and second 8 control lines branching therefrom is connected to each injector 5.
- the control pressure acts on pistons 16 and 17, which are assigned to control rooms 13 and 14.
- the control pressure present in the first control chamber 13 before the start of injection causes an increase in the nozzle opening pressure.
- the control pressure is preferably also applied to the control rod 71 of the double-piston pump 1 via a control line 9.
- the control pressure on the control rod 71 is used to adjust the start of delivery to compensate for the start of injection adjustment by increasing the nozzle opening pressure.
- control signal can be derived from the control pressure, which is converted into a new electrical or hydraulic control variable.
- electronically stored tables can be used to generate suitable electrical or hydraulic control variables from the control signal.
- a device for generating the control pressure consists, for example, of an engine control unit 82 which controls a pressure control valve 83.
- Engine oil for example, which is taken from a engine oil tank 81 by a pump 80, can serve as the control fluid.
- the double-piston pump 1 is designed with a first 70 and a second 73 pump piston with pump cylinders 72, 75. Control rods 71 and 77 are assigned to the pump pistons 70, 73. According to the invention, the first pump piston 70 is used to control the start of delivery and the second pump piston 73 is used to control the end of delivery. The fuel delivered reaches the nozzle chamber 11 of the injector 5 via an injection line 4. The start of delivery of the first pump piston is adjusted, for example, by the pressure applied to the control rod 71 via the control line 9, 7 at a low engine speed in the direction of EARLY and at higher speeds in the direction LATE. The adjustment of the control rod can also require different control strategies depending on the engine operating state.
- control rod 71 must then be provided with an actuating device which can be controlled independently of the pressure prevailing in the control line.
- the second pump piston 73 can lead the first pump piston 70 in terms of the start of delivery, the fuel delivered by the second pump piston 73 before the start of delivery of the first pump piston 70 being discharged via the control bores assigned to the first pump piston 70.
- the injector can be additionally pressurized with fuel pressure or another control fluid via the second control chamber 14 during an injection via the second control line 8 in order to increase the closing pressure.
- a valve 20 is used for this purpose, which is automatically opened by the stroke of the nozzle needle 12.
- the second control lines 8 can branch off from the common control line 9 or can be connected to a further control line (not shown) that is separate from the control line 9 and has a different pressure level.
- control chamber 14 can also be connected to a bore 61 of the pump cylinder 75 via a control line 60, which is shown only in parts for reasons of clarity.
- the bore is arranged in the pump cylinder 75 such that the cut-off pressure is present in the control line 61 before the pressure drop at the delivery end causes the injection nozzles se reached.
- the closing pressure can be increased further.
- the control line 60 can also replace the second control lines 8 and only serve to regulate the closing pressure.
- the pump piston 70 shown in FIG. 2 with a stepped control edge 100 can be used in the double piston pump instead of a pump piston with a continuously running control edge to control the start of injection.
- the start of spraying is undesirably postponed.
- the control rod 71 corrects the rotational position of the pump piston 70.
- control rod 71 can be carried out by any means, for example also with the aid of the control pressure present in the control line 9, which acts on a control piston of the control rod 71, and by rotating the control rod 71 causes the pump piston 70 to rotate.
- the control piston of the control rod 71 works against a force that increases with increasing travel, for example the force of a spring, so that each control pressure can be assigned a certain travel that corresponds to a certain rotational position of the pump piston 70.
- the horizontal, circumferential and axially offset sections are arranged like the steps of a staircase.
- the transition from a horizontal step to the next horizontal step is preferably designed such that the next possible step is reached with the smallest possible rotation angle of the pump piston 70.
- a useful design are steps with horizontal and approximately vertical sections. Vertical means running in the direction of the longitudinal axis of the pump piston.
- This step of the control edge is particularly advantageous if the control pressure is also changed in defined steps.
- a deviation of the rotational position of the pump piston 70 from the desired rotational position nevertheless leads to the same start of delivery and thus start of spraying on the various double-piston pumps 1.
- the permissible tolerance deviations are greater the larger the horizontal step sections in relation to the diameter of the control opening 101.
- the adjustment error compensation that can be achieved with the stepped control edge 100 is advantageous not only in connection with the type of actuation shown with pressurization of the control rod 71. Rather, the stepped control edge 100 can also be used advantageously in conjunction with other means for actuating the control rod 71.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10307398 | 2003-02-20 | ||
DE10307398 | 2003-02-20 | ||
DE10319623 | 2003-05-02 | ||
DE10319623A DE10319623A1 (de) | 2003-02-20 | 2003-05-02 | Kraftstoffeinspritzeinrichtung |
PCT/EP2004/001509 WO2004074675A1 (de) | 2003-02-20 | 2004-02-18 | Kraftstoffeinspritzeinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1597474A1 true EP1597474A1 (de) | 2005-11-23 |
EP1597474B1 EP1597474B1 (de) | 2006-06-21 |
Family
ID=32909535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04712002A Expired - Lifetime EP1597474B1 (de) | 2003-02-20 | 2004-02-18 | Kraftstoffeinspritzeinrichtung |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1597474B1 (de) |
JP (1) | JP4142688B2 (de) |
KR (1) | KR100705854B1 (de) |
AT (1) | ATE331135T1 (de) |
DE (1) | DE502004000835D1 (de) |
WO (1) | WO2004074675A1 (de) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1253180A (fr) * | 1960-04-06 | 1961-02-03 | Maschf Augsburg Nuernberg Ag | Pompe d'injection de carburant |
DE1526711A1 (de) * | 1966-01-29 | 1969-12-04 | Maschf Augsburg Nuernberg Ag | Brennstoffeinspritzpumpe fuer grosse Mengen in Brennkraftmaschinen |
US3976249A (en) * | 1973-05-12 | 1976-08-24 | C.A.V. Limited | Fuel injection systems for internal combustion engines |
DE2558790A1 (de) * | 1975-12-24 | 1977-07-14 | Bosch Gmbh Robert | Kraftstoffeinspritzduese fuer brennkraftmaschinen |
DE2801976A1 (de) * | 1978-01-18 | 1979-07-19 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem |
US4327694A (en) * | 1979-11-01 | 1982-05-04 | Caterpillar Tractor Co. | Unit fuel pump-injector with overfuel capability and timing retardation |
JPS57102527A (en) * | 1980-12-15 | 1982-06-25 | Diesel Kiki Co Ltd | Fuel injection nozzle unit |
US5201295A (en) * | 1986-07-30 | 1993-04-13 | Ail Corporation | High pressure fuel injection system |
JPH05201295A (ja) * | 1992-01-29 | 1993-08-10 | Yazaki Corp | 自動車ドア用コネクタ |
-
2004
- 2004-02-18 AT AT04712002T patent/ATE331135T1/de not_active IP Right Cessation
- 2004-02-18 JP JP2005518424A patent/JP4142688B2/ja not_active Expired - Fee Related
- 2004-02-18 DE DE502004000835T patent/DE502004000835D1/de not_active Expired - Lifetime
- 2004-02-18 EP EP04712002A patent/EP1597474B1/de not_active Expired - Lifetime
- 2004-02-18 WO PCT/EP2004/001509 patent/WO2004074675A1/de active IP Right Grant
- 2004-02-18 KR KR1020057015449A patent/KR100705854B1/ko not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2004074675A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1597474B1 (de) | 2006-06-21 |
DE502004000835D1 (de) | 2006-08-03 |
KR20050107585A (ko) | 2005-11-14 |
ATE331135T1 (de) | 2006-07-15 |
JP2006515399A (ja) | 2006-05-25 |
WO2004074675A1 (de) | 2004-09-02 |
KR100705854B1 (ko) | 2007-04-09 |
JP4142688B2 (ja) | 2008-09-03 |
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