EP1259728A2 - Einspritzeinrichtung und verfahren zum einspritzen von fluid - Google Patents
Einspritzeinrichtung und verfahren zum einspritzen von fluidInfo
- Publication number
- EP1259728A2 EP1259728A2 EP01913657A EP01913657A EP1259728A2 EP 1259728 A2 EP1259728 A2 EP 1259728A2 EP 01913657 A EP01913657 A EP 01913657A EP 01913657 A EP01913657 A EP 01913657A EP 1259728 A2 EP1259728 A2 EP 1259728A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- control valve
- pressure
- control
- switching state
- control chamber
- 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
- 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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
- F02M45/08—Injectors 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
- 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
-
- 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
Definitions
- the invention relates to an injection device with a control valve, an actuating element for actuating the control valve and an injection nozzle which can be controlled by the control valve via pressure build-up or pressure reduction in a control chamber, the control valve having at least two switching states and being in a first switching state of the
- Control valve sets a first pressure in the control chamber at which the injection nozzle is closed, and in a second switching state of the control valve sets a second pressure in the control chamber at which the injection nozzle is open.
- the invention further relates to a method for injecting fluid, in which an actuating element is electrically controlled, the actuating element actuates a control valve, a pressure is built up or reduced in a control chamber by the actuation of the control valve, and the injector is dependent on the pressure in the Control room opens or closes.
- a generic device and a generic method are known and are preferred for storage devices.
- spray systems (“common rail") are used.
- pressure generation and injection are decoupled.
- the injection pressure is generated independently of the engine speed and the injection quantity and is available for injection in the "Rail” (fuel storage).
- the injection timing and injection quantity are calculated in an electronic control unit and implemented by the injection device on each engine cylinder via a controlled control element.
- Solenoid valves and piezo actuators are generally used as control elements.
- the injection device can thus be supplied practically continuously with the pressure from the common rail of, for example, 1000 to 2000 bar. This high pressure of the fluid is then used, on the one hand, to carry out an injection with a high injection pressure, a high pressure having a positive influence on pollutant emissions and fuel consumption.
- the fluid is also used for the stroke-controlled operation of the system.
- leakage quantities occur at several points and during several functional states of the system.
- the pressure chamber the injection nozzle in connection, inter alia, via the guidance of the pressure rod of the injection nozzle with the control chamber of the injection device, which is preferably directly adjacent to the pressure rod. If the pressure in the control chamber is now released in order to relieve the pressure rod and enable the injection nozzle to open, there is a large pressure difference between the control chamber, which is connected to a leakage system for relief, and the pressure chamber of the injection nozzle, in which the Common Rail is under pressure. There is therefore an overflow of fuel from the pressure chamber of the injection nozzle into the control chamber and ultimately into the leakage system.
- the guides on the push rod act like an inlet throttle (Z throttle), which is an undesirable side effect when the pressure in the control chamber is relieved of pressure.
- throttles both inlet throttles and outlet throttles
- the injection device according to the invention according to claim 1 is based on the prior art in that the control valve has at least a third switching state in which a third pressure is established in the control chamber, which is between the first pressure and the second pressure and in which the injection nozzle is open. In this way, the disadvantages of the prior art are countered.
- the control chamber is relieved of pressure by actuating the control valve, there is a high pressure difference between the control chamber and the pressure chamber of the injection nozzle.
- this is desirable so that the injection nozzle opens quickly, on the other hand, it has the disadvantage that large amounts of fuel flow from the pressure chamber via the guide of the pressure rod of the injection nozzle into the control chamber and ultimately into the leakage system.
- the invention it is now possible, on the one hand, to ensure that the injection nozzle opens quickly, namely by relieving the pressure on the control chamber in the usual manner, but then again to ensure a certain pressure build-up in the control chamber.
- this pressure build-up in the control chamber reduces the pressure difference between the control chamber and the pressure chamber of the injection nozzle and consequently the overflow of fluid into the control chamber and into the leakage system.
- the pressure can be selected so that the injection nozzle remains in its open state. Furthermore, it is advantageous that even before
- the control element is preferably a piezo actuator, which undergoes a length change due to electrical control.
- Piezo actuators have proven their worth when used in injection systems, in particular due to their small size and reliable operation. In the present case, the use of piezo actuators is particularly useful since their change in length can be influenced in a simple manner by the parameters of the electrical control (for example voltage, pulse duration).
- the control valve preferably has a fourth switching state, in which a pressure is established in the control chamber, at which the injector is closed. This can facilitate the cyclic operation of the control valve, particularly with regard to injection course shaping and pre-injection.
- control space is partially delimited by an end face of a push rod of the injection nozzle.
- the control room is directly adjacent to the push rod, which is the transfer of fluid from the
- Pressure chamber in the control room favored in the presence of a pressure difference.
- the reduction in pressure difference has a particularly strong effect in such a system.
- the pressure rod is preferably acted upon by elastic means.
- elastic means preferably a spiral spring, hold the injection nozzle securely in a defined state.
- a particularly advantageous development of the invention is that the control valve is in the first switching state in a first valve seat, so that the control chamber is separated from a leak system, that the control valve is not in a valve seat in the second switching state, so that the Control room is connected to a leak system via a first flow cross-section and that the control valve in the third switching state is not in a valve seat, so that the control room is connected to a leak system via a second flow cross-section, the first flow cross-section being larger than the second flow cross-section.
- the suitable selection of the flow cross sections of the control valve allows the pressure build-up in the control chamber to be selected in a particularly simple manner. For example, the first flow cross the maximum possible flow cross section of the control valve, that is, the control valve is fully open.
- the second flow cross-section is then continuously adjustable between the closed state of the control valve (flow cross-section 0) and the fully open state with the maximum flow cross-section.
- the correct pressure build-up in the second switching state of the control valve can therefore be determined via the characteristic of the control valve.
- control valve is in a fourth switching state in a second valve seat, so that the control chamber is separated from a leak system.
- the pressure build-up in the control chamber for closing the injection nozzle also takes place in this variant by closing the control valve, but via a second valve seat.
- an opening and subsequent closing of the injection nozzle can thus take place by an exclusive expansion of the control element.
- a subsequent (partial) cycle then takes place through an exclusive shortening of the length.
- the injection pressure is preferably generated by a common rail.
- the invention is particularly useful in this system, where a high pressure is continuously present in the pressure chamber of the injection nozzle.
- the high pressure in the pressure chamber of the injection nozzle results in a high pressure difference between the pressure chamber and the control chamber.
- a reduction in this pressure difference due to a change in the pressure in the control room can at least partially eliminate the disadvantages due to excessively large amounts of leakage.
- the invention is based on the generic method in that, by actuating the actuating element, mentes the control valve is first brought from a first switching state into a second switching state of at least three switching states, whereby the pressure in the control chamber is reduced and the injector opens, that by further actuation the control element, the control valve is brought into a third switching state of at least three switching states , whereby a pressure is built up in the control chamber and the injection nozzle remains in the open state and that by further actuation of the control element, the control valve into another
- control valve is in a first valve seat in the first switching state and that the further switching state corresponds to the first switching state. The control valve thus returns to its starting position in the first valve seat to end the injection process.
- control valve is preferably located in a second valve seat.
- control chamber in the first switching state of the control valve and the further switching state of the control valve the control chamber is separated from a leak system and that in the second switching state of the control valve and the third switching state of the control valve the control chamber is connected to the leak system.
- the pressure relief of the control chamber thus takes place by connecting the control chamber to a leak system, while the pressure build-up takes place by decoupling the control chamber from the leak system.
- the flow cross section through the control valve is larger in the second switching state of the control valve than in the third switching state of the control valve.
- the variable pressure setting in the control room is therefore set via the flow cross section of the control valve.
- the invention is based on the surprising finding that the amount of leakage in an injection system can be reduced by changing the pressure in the control chamber during the opening phase of the injection nozzle. It has been recognized that the pressure in the control chamber can be adjusted to a considerable extent to the common rail pressure in the pressure chamber of the injection nozzle, so that, on the one hand, the injection nozzle is not yet closed, but on the other hand a significantly lower flow of fluid occurs the pressure chamber in the control room.
- FIG. 1 shows a section of an injection device according to the invention in a partially sectioned illustration
- FIG. 2 shows three diagrams to explain the method according to the invention
- Figure 3 shows a diagram for explaining the invention.
- a control valve 2 can be actuated by an actuating element, not shown, which is arranged above the control valve 2.
- the control valve 2 has a first valve seat 4 and a second valve seat 6.
- the control valve 2 communicates with a control chamber 8, which is partially delimited by the push rod 10 of an injection nozzle.
- the push rod 10 is also acted upon by a spring 12 to provide the injector with a defined closed position.
- the control valve 2 is located in its first valve seat 4, so that the control chamber 8 is separated from a leak system 14, which is indicated schematically by a line.
- control chamber 8 Since the control chamber 8 is connected to the common rail 16, also indicated schematically by a line, the common rail pressure can develop in the control chamber 8 in the state of the control valve 2 shown. Consequently, the push rod 10 and thus the Injector down, which keeps the injector closed. If the control valve 2 now leaves its first valve seat 4 by actuation by the control element, the control chamber 8 is relieved. As a result, the injector push rod 10 can move upward. Therefore, the injector opens.
- the stroke and pressure ratios in the injection system according to the invention are explained in more detail with reference to FIG. 2.
- the stroke of the control valve H S ⁇ v is plotted against the time t.
- the nozzle stroke H D is also plotted against the time t in the middle diagram (b).
- the pressure in the control chamber p STR is plotted against the time t in the lower diagram (c).
- the three diagrams (a), (b) and (c) are arranged one above the other so that their time axes t correspond.
- the control valve Before the time ti, the control valve is in its seat.
- the stroke of the control valve is zero. As a result, a high pressure builds up in the control room, which leads to the nozzle stroke also being zero.
- the control valve is now actuated so that its stroke is different from zero.
- the control room is relieved accordingly.
- the nozzle also opens.
- the nozzle is in its fully open state and the control chamber is largely relieved.
- curve (i) shows how the stroke of the control valve continues to behave according to the prior art.
- the control valve is simply held at its maximum stroke, which means that the pressure according to curve (i) in the lower diagram (c) from FIG. 2 also remains at the low value shown. Consequently, according to the prior art, there is a large pressure difference between the pressure chamber of the injection nozzle and the control chamber.
- FIG. 3 in which the flow cross section Q against the absolute stroke H ' STv is shown.
- the large H ' s ⁇ v is thus the actual stroke of the control valve from its first valve seat (seat 1) and not, as in FIG. 2a, the relative stroke with respect to any valve seat.
- the flow cross-section Q can be set between zero and a maximum value by means of a suitably chosen stroke H ' s ⁇ v .
- a suitable stroke H ' STv and thus also a suitable flow cross section Q can thus be set by suitable control of the control element and corresponding length change.
- the setting of a reduced flow cross section, for example Q lr then leads to the advantageous pressure increase in the control chamber according to the invention according to FIG. 2c.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
- Lift Valve (AREA)
- Control Of Fluid Pressure (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10006786 | 2000-02-18 | ||
DE10006786A DE10006786A1 (de) | 2000-02-18 | 2000-02-18 | Einspritzeinrichtung und Verfahren zum Einspritzen von Fluid |
PCT/DE2001/000585 WO2001061180A2 (de) | 2000-02-18 | 2001-02-16 | Einspritzeinrichtung und verfahren zum einspritzen von fluid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1259728A2 true EP1259728A2 (de) | 2002-11-27 |
EP1259728B1 EP1259728B1 (de) | 2006-01-18 |
Family
ID=7631032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01913657A Expired - Lifetime EP1259728B1 (de) | 2000-02-18 | 2001-02-16 | Einspritzeinrichtung und verfahren zum einspritzen von fluid |
Country Status (8)
Country | Link |
---|---|
US (1) | US20030141389A1 (de) |
EP (1) | EP1259728B1 (de) |
JP (1) | JP2003522904A (de) |
CN (1) | CN1404550A (de) |
AT (1) | ATE316204T1 (de) |
CZ (1) | CZ20022780A3 (de) |
DE (2) | DE10006786A1 (de) |
WO (1) | WO2001061180A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10335211A1 (de) * | 2003-08-01 | 2005-02-17 | Robert Bosch Gmbh | Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine |
DE102005059169A1 (de) * | 2005-12-12 | 2007-06-14 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkt betätigbarem Einspritzventilglied |
EP2816212A1 (de) * | 2013-06-21 | 2014-12-24 | Continental Automotive GmbH | Verfahren und Vorrichtung zur Steuerung eines Einspritzventils |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0529630B1 (de) * | 1991-08-30 | 1996-03-27 | Nippondenso Co., Ltd. | Brennstoffeinspritzvorrichtung für Brennkraftmaschine |
US5463996A (en) * | 1994-07-29 | 1995-11-07 | Caterpillar Inc. | Hydraulically-actuated fluid injector having pre-injection pressurizable fluid storage chamber and direct-operated check |
US5720318A (en) * | 1995-05-26 | 1998-02-24 | Caterpillar Inc. | Solenoid actuated miniservo spool valve |
DE19624001A1 (de) * | 1996-06-15 | 1997-12-18 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
US5860597A (en) * | 1997-03-24 | 1999-01-19 | Cummins Engine Company, Inc. | Injection rate shaping nozzle assembly for a fuel injector |
DE19732802A1 (de) * | 1997-07-30 | 1999-02-04 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19742073A1 (de) * | 1997-09-24 | 1999-03-25 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19752851C1 (de) * | 1997-11-28 | 1998-12-17 | Siemens Ag | Hydraulisches Absteuerventil |
-
2000
- 2000-02-18 DE DE10006786A patent/DE10006786A1/de not_active Ceased
-
2001
- 2001-02-16 US US10/204,172 patent/US20030141389A1/en not_active Abandoned
- 2001-02-16 AT AT01913657T patent/ATE316204T1/de not_active IP Right Cessation
- 2001-02-16 CZ CZ20022780A patent/CZ20022780A3/cs unknown
- 2001-02-16 WO PCT/DE2001/000585 patent/WO2001061180A2/de active IP Right Grant
- 2001-02-16 DE DE50108750T patent/DE50108750D1/de not_active Expired - Lifetime
- 2001-02-16 CN CN01805192.8A patent/CN1404550A/zh active Pending
- 2001-02-16 EP EP01913657A patent/EP1259728B1/de not_active Expired - Lifetime
- 2001-02-16 JP JP2001560005A patent/JP2003522904A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO0161180A3 * |
Also Published As
Publication number | Publication date |
---|---|
ATE316204T1 (de) | 2006-02-15 |
EP1259728B1 (de) | 2006-01-18 |
DE10006786A1 (de) | 2001-08-30 |
WO2001061180A3 (de) | 2002-02-14 |
JP2003522904A (ja) | 2003-07-29 |
CZ20022780A3 (en) | 2004-04-14 |
WO2001061180A2 (de) | 2001-08-23 |
US20030141389A1 (en) | 2003-07-31 |
DE50108750D1 (de) | 2006-04-06 |
CN1404550A (zh) | 2003-03-19 |
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