WO2001071177A2 - Verfahren und vorrichtung zur formung des einspritzdruckverlaufs an injektoren - Google Patents
Verfahren und vorrichtung zur formung des einspritzdruckverlaufs an injektoren Download PDFInfo
- Publication number
- WO2001071177A2 WO2001071177A2 PCT/DE2001/001059 DE0101059W WO0171177A2 WO 2001071177 A2 WO2001071177 A2 WO 2001071177A2 DE 0101059 W DE0101059 W DE 0101059W WO 0171177 A2 WO0171177 A2 WO 0171177A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- injection
- pressure
- phase
- shaping
- actuator
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/06—Pumps peculiar thereto
-
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
Definitions
- the invention relates to a method and a device for shaping the injection pressure curve on injectors.
- injectors and injection systems in which the injectors are used are used, for example, to deliver fuel to internal combustion engines of motor vehicles.
- a solenoid valve which serves to build up pressure
- another Pressure valve which serves as a downstream valve only for regulating the pressure level during the pressure build-up phase (boot phase).
- both the duration of the pre-injection phase and the duration of the pressure build-up phase can be determined by actuation by means of an actuator.
- the proposed method allows the pressure to be preset to different pressure level values during the pressure build-up phase. The same applies to the setting of the level of the permissible, mechanically still manageable maximum pressure towards the end of the main injection phase.
- a pressure limitation towards the end of the main injection phase can be adapted to the respective operating conditions of the injection system.
- the course of the pressure reduction can be preselected so that the time of the end of the main injection and that of the beginning of the pressure reduction phase can be individually adjusted.
- the pump part of an injector system can be designed such that only one pump can be used for different designs of internal combustion engines.
- the pressure build-up phase for example, which follows the pre-injection phase, can be initiated by an actuator control, depending on the application, regardless of the nozzle and pump piston design.
- the course of the pressure in the pressure build-up phase is independent of the load and the torque in the current operating state of the internal combustion engine and can, for example, be selected so that the pressure in the pressure build-up phase is just above the nozzle needle opening pressure of the nozzle needle movably received in the injector housing.
- control valves for the pressure build-up phase can be moved into the sealing seat. This makes it possible to widen the actuator stroke tolerances, which makes its manufacture cheaper, since protection against leakage losses at fuel under high pressure is ensured by the control valves moved into their sealing position.
- control of the control valves by means of a piezo actuator means that there is no need for solenoid valves that take up space, which means that the injector can be designed in an extremely compact design.
- FIG. 1 shows the pump part of an injector, which by means of a
- High-pressure line is connected to the injector part of the injector
- FIG. 2 shows the arrangement of the control valves in the pump part of the injector
- FIG. 3 shows the top view of the coupling space
- Figure 4 each stroke and / or pressure curves on the components of the injection system causing the injection process
- Figure 5 shows the nozzle needle stroke and the moldable
- Injection pressure curve plotted against the time axis, compared to each other.
- FIG. 1 shows a pump part of an injector, which is connected to an injector part of the injector, with a high-pressure line being interposed.
- the pump part 1 is connected via the high-pressure line 3 to the injector part of the injector.
- the pump chamber 4 is acted upon by a piston 5.
- the control valves 8 and 10 are each acted upon by a force accumulator 12 or 13, the force accumulators 12 or 13 reacting to the desired opening characteristics of the two control valves 8 or 10. 10 are matched.
- the control valves 8 and 10 are connected to respective pressure chambers with a lower pressure level, into which excess blown-off fuel can be discharged.
- the storage tanks of a motor vehicle for example, are to be regarded as such pressure rooms of lower pressure levels.
- control valve 10 is assigned a constant pressure valve 7, which is provided in the return line from the second control valve 10 into the low pressure chamber 6, ie into the feed line to the fuel tank.
- the constant pressure valve 7 upstream of the control valve 10.
- the control valve 10 could be designed in a lighter embodiment due to the lower pressure load.
- the two control valves 8 and 10 are each acted upon by a separate energy store 12 or 13, by means of which the opening characteristics of the first and second control valves 8, 10 can be set.
- a coupling space 11 is provided above the two control valves 8 and 10;
- An actuator 9 is provided above the coupling space 11 - preferably embodied as a piezo actuator with which extremely fast switching times can be achieved - with which the control parts of the first and the second control valve 8 and 10 can be controlled.
- the use of a Piezo actuator instead of solenoid valves allows the pump part 1 of the injector of the injection system to be designed in an extremely compact manner.
- the high-pressure line 3 leading from the pump part 1 to the injection nozzle part 2 for transporting the fuel under high pressure opens into a control chamber 15 which surrounds the nozzle needle 14 of the injector.
- the tip of the nozzle needle 14 forms the nozzle 16, which opens into the corresponding combustion chambers of the internal combustion engine.
- Figure 2 shows the arrangement of the control valves in the pump part of the injector.
- the movement of the piston 5 causes an increase in pressure, the incompressible medium fuel.
- the fuel under high pressure is connected via the feed line 18 to chambers of the control valves 8 and 10 surrounding the control parts.
- Each of the control valves 8 and 10 is provided with an energy accumulator with which the control part 8 and 10 can be kept open under pretension.
- the control chamber of the control part of the second control valve 10 is connected to the constant pressure valve 7, via the pretensioning of which the control rate can be kept variable.
- Both the respective piston parts and the cavities in which the energy accumulators 12, 13 of the two control valves 8 and 10 are accommodated are connected via drain lines 17 and 20 to the low-pressure chambers 6, for example the storage tank, in which the excess fuel is removed can.
- control parts of the control valves 8, 10 can be actuated via the actuator 9 into different partial opening positions be driven.
- the second control valve 10 can be controlled by the actuator 9 - a certain amount of fuel corresponding to the released opening cross section can then flow into the storage tank 6 for a preselectable period of time, so that the injection pressure can be modeled accordingly ,
- FIG. 3 shows the top view of the arrangement according to FIG. 2.
- the compact design of the pump part 1 and the injector part 2 stems from the course of the high-pressure line 3 between the first and the second control valve 8 and 10, respectively.
- the control chambers surrounding the control valves 8 and 10 are shown in dashed lines.
- the connecting line 21 from the second control valve 10 to the constant pressure valve 7 is also shown in dashed lines.
- the compact design of the injector can be recognized by the relative positions of the high pressure line 3, the two control valves 8, 10 and the constant pressure valve 7 which can be seen from the top view.
- FIG. 4 shows the respective stroke and pressure profiles on the components which bring about the injection process on the internal combustion engine. These can be subdivided into a pre-injection phase 28 and a pressure build-up and main injection phase 29 or 30. This is followed by a pressure reduction phase 35.
- a direct image of the stroke profile of the actuator 9 shown in the first diagram 22 is the pressure that is established in the coupling space 11, see diagram 23.
- the stroke paths that occur in the control valves 8, 10 are each plotted over the time axis.
- the oscillation range of the control part in the first control valve 8, which lies in the diagram 24 between the end of the pre-injection phase 28 and the start of the pressure build-up phase 29, is represented by a curved line.
- FIG. 5 shows the nozzle needle stroke 26 plotted over the time axis, and the moldable injection pressure curve 27.
- the injection pressure curve 27 shown in the bottom diagram in FIG. 4 is shown in more detail in FIG.
- the duration of the pre-injection phase 28 is designated by reference numeral 31;
- the pre-injection phase 28 is followed by the pressure build-up phase 29, in which, according to FIG. 5, the different pressure levels 32.1, 32.2 and 32.3 can be set.
- the adjustability of the pressure levels a wide variety of designs of internal combustion engines can be taken into account with one injector.
- Application-specific settings can be made so that a component can be adapted to different possible uses by means of the flexible controllability by means of the actuator 9, whereby the variety of variants can be drastically reduced.
- the duration of the pressure build-up phase 29 is designated by reference numeral 33.
- the respective pressure level 34.1, 34.2 or 34.3 can be preset by the second control valve 10. By opening the return line, in which the constant pressure valve 7 is received, the fuel can flow out into the low pressure chamber 6, ie into the fuel tank. By setting the pressure levels 34.1, 34.2 and 34.3, the maximum pressure can be adjusted according to the requirements, so that the mechanical components of the Injector from damage caused by impermissibly high pressures.
- the actuator control which is independent of the speed and load profile, by means of a piezo actuator can also achieve a variable profile 36 during the pressure reduction phase 35 during the transition from the main injection phase 30 into the pressure reduction phase 35.
- the course of the pressure reduction can be adapted to the individual requirements of the respective application by influencing the slope 36.
- Control room nozzle return of 8 10 inlet to 8 housing return of 8, 10 connecting line between 10 and 7 actuator stroke 23 pressure curve in 11
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/979,500 US6688278B2 (en) | 2000-03-23 | 2001-03-20 | Method and device for shaping the injection pressure course in injectors |
BR0105315-9A BR0105315A (pt) | 2000-03-23 | 2001-03-20 | Processo e dispositivo para a configuração do decurso da pressão de injeção em injetores |
JP2001569136A JP2003528252A (ja) | 2000-03-23 | 2001-03-20 | インジェクタにおける噴射圧プロセス形成法と装置 |
EP01919222A EP1368563A2 (de) | 2000-03-23 | 2001-03-20 | Verfahren und vorrichtung zur formung des einspritzdruckverlaufs an injektoren |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10014451.9 | 2000-03-23 | ||
DE10014451A DE10014451A1 (de) | 2000-03-23 | 2000-03-23 | Verfahren und Vorrichtung zur Formung des Einspritzdruckverlaufs an Injektoren |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001071177A2 true WO2001071177A2 (de) | 2001-09-27 |
WO2001071177A3 WO2001071177A3 (de) | 2003-10-09 |
Family
ID=7636062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001059 WO2001071177A2 (de) | 2000-03-23 | 2001-03-20 | Verfahren und vorrichtung zur formung des einspritzdruckverlaufs an injektoren |
Country Status (8)
Country | Link |
---|---|
US (1) | US6688278B2 (de) |
EP (1) | EP1368563A2 (de) |
JP (1) | JP2003528252A (de) |
CN (1) | CN1527904A (de) |
BR (1) | BR0105315A (de) |
CZ (1) | CZ20014193A3 (de) |
DE (1) | DE10014451A1 (de) |
WO (1) | WO2001071177A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003214279A (ja) * | 2002-01-22 | 2003-07-30 | Mitsubishi Heavy Ind Ltd | 燃料噴射装置 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1359316B1 (de) * | 2002-05-03 | 2007-04-18 | Delphi Technologies, Inc. | Kraftstoffeinspritzeinrichtung |
DE102006003484A1 (de) * | 2005-03-16 | 2006-09-21 | Robert Bosch Gmbh | Vorrichtung zum Einspritzen von Kraftstoff |
EP1860318B1 (de) * | 2005-03-18 | 2019-02-20 | Toyota Jidosha Kabushiki Kaisha | Verbrennungsmotor mit zweikreiskraftstoffeinspritzung |
US20110048379A1 (en) * | 2009-09-02 | 2011-03-03 | Caterpillar Inc. | Fluid injector with rate shaping capability |
CN103597182B (zh) * | 2011-04-29 | 2017-03-15 | 万国引擎知识产权有限责任公司 | 运行压燃式发动机的方法及压燃式发动机 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1522954A (en) * | 1974-11-01 | 1978-08-31 | Cav Ltd | Fuel systems for internal combustion engines |
GB1543714A (en) * | 1975-03-07 | 1979-04-04 | Lucas Cav Ltd | Fuel injection pumping apparatus |
US5628293A (en) * | 1994-05-13 | 1997-05-13 | Caterpillar Inc. | Electronically-controlled fluid injector system having pre-injection pressurizable fluid storage chamber and direct-operated check |
DE19939457A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Hydraulische Steuervorrichtung |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2568603B2 (ja) * | 1988-01-11 | 1997-01-08 | 日産自動車株式会社 | 燃料噴射装置 |
US5732679A (en) * | 1995-04-27 | 1998-03-31 | Isuzu Motors Limited | Accumulator-type fuel injection system |
US5499608A (en) * | 1995-06-19 | 1996-03-19 | Caterpillar Inc. | Method of staged activation for electronically actuated fuel injectors |
JPH09209867A (ja) * | 1996-02-07 | 1997-08-12 | Mitsubishi Motors Corp | 燃料噴射装置 |
GB9820239D0 (en) * | 1998-09-18 | 1998-11-11 | Lucas Ind Plc | Fuel injector |
DE10012552A1 (de) * | 2000-03-15 | 2001-09-27 | Bosch Gmbh Robert | Einspritzeinrichtung mit einem Aktor zur Nadelhubsteuerung |
US6378487B1 (en) * | 2000-09-01 | 2002-04-30 | International Truck And Engine Corporation | Method and apparatus for pre-pilot fuel injection in diesel internal combustion engines |
DE10123995A1 (de) * | 2001-05-17 | 2002-11-21 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
US6470849B1 (en) * | 2001-06-26 | 2002-10-29 | Caterpillar Inc. | Separate injector main timing maps for use with and without pilot |
-
2000
- 2000-03-23 DE DE10014451A patent/DE10014451A1/de not_active Ceased
-
2001
- 2001-03-20 WO PCT/DE2001/001059 patent/WO2001071177A2/de not_active Application Discontinuation
- 2001-03-20 CN CNA018006442A patent/CN1527904A/zh active Pending
- 2001-03-20 JP JP2001569136A patent/JP2003528252A/ja active Pending
- 2001-03-20 EP EP01919222A patent/EP1368563A2/de not_active Withdrawn
- 2001-03-20 CZ CZ20014193A patent/CZ20014193A3/cs unknown
- 2001-03-20 BR BR0105315-9A patent/BR0105315A/pt not_active IP Right Cessation
- 2001-03-20 US US09/979,500 patent/US6688278B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1522954A (en) * | 1974-11-01 | 1978-08-31 | Cav Ltd | Fuel systems for internal combustion engines |
GB1543714A (en) * | 1975-03-07 | 1979-04-04 | Lucas Cav Ltd | Fuel injection pumping apparatus |
US5628293A (en) * | 1994-05-13 | 1997-05-13 | Caterpillar Inc. | Electronically-controlled fluid injector system having pre-injection pressurizable fluid storage chamber and direct-operated check |
DE19939457A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Hydraulische Steuervorrichtung |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003214279A (ja) * | 2002-01-22 | 2003-07-30 | Mitsubishi Heavy Ind Ltd | 燃料噴射装置 |
Also Published As
Publication number | Publication date |
---|---|
CN1527904A (zh) | 2004-09-08 |
CZ20014193A3 (cs) | 2003-04-16 |
US6688278B2 (en) | 2004-02-10 |
DE10014451A1 (de) | 2001-09-27 |
EP1368563A2 (de) | 2003-12-10 |
JP2003528252A (ja) | 2003-09-24 |
US20020162528A1 (en) | 2002-11-07 |
WO2001071177A3 (de) | 2003-10-09 |
BR0105315A (pt) | 2002-02-19 |
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