EP1687523A1 - Injection unit and injection method for an internal combustion engine - Google Patents
Injection unit and injection method for an internal combustion engineInfo
- Publication number
- EP1687523A1 EP1687523A1 EP04819234A EP04819234A EP1687523A1 EP 1687523 A1 EP1687523 A1 EP 1687523A1 EP 04819234 A EP04819234 A EP 04819234A EP 04819234 A EP04819234 A EP 04819234A EP 1687523 A1 EP1687523 A1 EP 1687523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- fuel
- pressure
- valve
- servo
- 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
- F02M63/02—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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
-
- 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
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
- F02M61/167—Means for compensating clearance or thermal expansion
-
- 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
-
- 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
Definitions
- Such an injection system and such an injection method are known for example from DE 100 15 740 AI.
- a Injektora ⁇ UTHORISATION at least one servo injection valve, which is actuated by means of a piezoelectric actuator to cause an injection passage for initiating an injection process by pressure reduction in a control chamber a movement of a servo-valve-nozzle body (nozzle needle) in the direction of an opening between a nozzle chamber of the servo injection valve and a combustion chamber of the internal combustion engine in question is provided.
- a major advantage of using a servo injector actuated by means of a piezoelectric actuator is that with a comparatively small stroke of the piezoelectric actuator, an independent, usually much larger stroke of the nozzle body can be achieved (stroke ratio).
- stroke ratio an independent, usually much larger stroke of the nozzle body can be achieved (stroke ratio).
- the movement of the nozzle body for opening and closing the injection passage is driven by the pressure of the fuel, which is already available in the area of the injection valve under comparatively high pressure for the purposes of injection into the combustion chamber.
- a piezoelectric actuator generally has a stack of piezo elements lying one on top of the other, which changes its length rapidly when an electrical voltage is applied, to an extent dependent on the voltage, among other things.
- a wide variety of suitable piezoelectric ceramics are known, for example as lead zirconate titanate ceramics, and are particularly interesting for use with injection valves because of their high rate of change and their high piezo forces.
- the length of the piezoelectric actuator does not only depend on the applied voltage, but is also subject, for example, to manufacturing tolerances and a dependency on the temperature of the actuator, a more or less large gap in the path of action becomes in the design of a servo injector actuated by a piezoelectric actuator Actuator provided for a control valve body, which serves as a tolerance range for undesirable deviations and / or changes in the actuator length.
- This so-called tolerance gap in the piezo-actuated injection valve should on the one hand be dimensioned as small as possible in order to maximize the usable stroke of the actuator and on the other hand should be dimensioned as large as possible in order to avoid any change in the length of the valve caused by operation in as many operating states as possible piezoelectric actuator exceeds the tolerance gap and thus already actuates the control valve without actuating the actuator.
- the tolerance gap can hardly be dimensioned "optimally" in practice.
- the tolerance gap can be exceeded due to an increase in the temperature of the actuator and the fuel that is led from the pressure accumulator via a pressure line to the control chamber can be released further via the control valve into the practically unpressurized leakage line (compared to the fuel system pressure in the pressure accumulator), the result is yet another problem.
- the internal combustion engine is to be started in the "hot state", e.g. B. after a preceding prolonged operation with a subsequent shutdown of the internal combustion engine, so the release of fuel from the control space into the leakage line of the pressure build-up in the pressure accumulator can be considerably more difficult due to or deferrers ⁇ be siege.
- the build-up of a certain minimum system pressure which is typically a few 100 bar, is necessary in order to realize an injection from the nozzle chamber into the combustion chamber at all.
- a method and an arrangement for presetting and dynamic tracking of piezoelectric actuators is known, in which a DC voltage is supplied to the piezo actuator for this purpose, which is optionally superimposed on a pulsed control voltage. This DC voltage component then determines a new rest position of the actuator and can thus be used to adjust the idle stroke and to adjust the idle stroke during operation.
- a piezo control valve which consists of a piezo actuator arranged in a housing and a valve.
- a hydraulic lash adjuster within the control valve automatically compensates for possible changes in length of the reference system, so that the same stroke on the valve is always guaranteed with the same working stroke of the piezo actuator.
- the leakage line in the injection system is provided with a controllable valve which, in a controlled state, inhibits the fuel flow in the leakage line or that the fuel injection flow is selectively inhibited in the leakage line. If the tolerance gap is exceeded by one of the actual piezo— Control independent change in length of the actuator, hereinafter also referred to briefly as “actuator overhang”, can be mitigated or even eliminated the negative effects of this situation in a relatively simple manner by the fuel flow inhibition. If there is an actuator overhang and the
- the measures according to the invention can be used in combination with the measures already implemented, such as. B. with the above-mentioned active electrical adjustment or tracking of the actuator idle stroke ("active piezo contraction") or cooling the internal combustion engine.
- a simple actuation of the control valve results when the piezoelectric actuator acts on a valve body of the control valve via a plunger, wherein the tolerance gap can be provided between the actuator and the plunger or between the plunger and the valve body.
- the effect of the fuel flow inhibition in the leakage line can be provided to be particularly great by blocking the fuel flow when the controllable valve is activated, i. H. is completely inhibited.
- controllable valve is controlled as a function of predetermined, in particular measured, operating parameters of the internal combustion engine and / or the injection system.
- operating parameters can in particular the fuel pressure in the pressure accumulator, the force include material pressure in the leakage line, the temperature in a region of the internal combustion engine or the injector arrangement, the speed of the internal combustion engine and its load or its control ("accelerator pedal position") etc.
- Particularly advantageous operating parameters can also be used, which representative of the condition of individual or al- • ler of piezoelectric actuators (z. B. for the temperature and / or rest length), respectively.
- the latter parameters can be obtained indirectly, for example, from an electronic device for actuating the piezo actuators (motor control device), for example. B.
- suitable parameters can also be derived from the characteristic of the movement of the nozzle body, which is often recorded anyway (for example for injection quantity control) in response to a piezo control in the operation of the injection system. To capture this characteristic be ⁇ known servo injection valves of the type of interest here are often provided with a .′′ to the position of the nozzle body sensors.
- a plurality of operating parameters are combined in an electronic evaluation device and control signals for the or the controllable valves for fuel flow inhibition in the leakage line are generated from a previously stored characteristic map and are supplied to these valves for electronic control ,
- controllable valve for fuel flow inhibition is actuated when a certain operating parameter state for the fuel flow inhibition is present and according to a predefined (or alternatively according to a time-dependent period of certain operating parameters) is returned to the idle state.
- This idle state can then, for. B. can be maintained for a fixed predetermined period of time (dead time).
- This high-pressure valve has a low-pressure region L which is connected to a leakage line, not shown, and a high-pressure region H which is connected to a pressure accumulator via a pressure line, not shown.
- These two areas L, H, which are acted upon with different pressure, are separated from one another by a control valve which is formed by a control valve seat S and a control valve body K which is driven against the control valve seat S by the high pressure in the high pressure area H.
- Injection process is the pressure in the control room or in the
- FIG. 2 shows an injection system 10 for an internal combustion engine (not shown), comprising a pressure accumulator 12 for storing fuel conveyed from a fuel tank 16 into the pressure accumulator 12 by means of a high-pressure pump 14, and an injector arrangement 20 connected to the pressure accumulator 12 via a pressure line arrangement 18 Injecting the fuel into the internal combustion engine.
- the injector arrangement 20 consists of four servo injection valves, which are supplied with fuel via four separate pressure lines 18 from the pressure accumulator 12 provided for this purpose.
- Each of the servo injection valves is of the type explained with reference to FIG. 1 and has a control chamber and a nozzle chamber, both of which are supplied with fuel from the pressure accumulator 12 via the respective pressure line, this fuel being supplied by the high-pressure pump 14, high system pressure.
- Servo injection valves of this type are well known to the person skilled in the art, so that a further explanation is not necessary here.
- an injection process is initiated in each case by reducing the pressure in the control chamber of the respective servo injector, which for this purpose is provided with a piezoelectrically operated control valve for releasing fuel from the control chamber into a leakage line 22.
- Prefeed pump is fed 28 to an input of the high pressure pump 14, a high pressure line 30 ter to promote un ⁇ system pressurized fuel from the high pressure pump 14 into the accumulator 12, a high pressure sensor 32 to the measure- ment of the pressure in the pressure accumulator 12, from the high pressure pump 14 outgoing fuel return line 34 for the removal of excess fuel from the pump 14 to the leakage line 22 and thus further back into the fuel tank 16, and an electronic engine control unit ECU with a series of input connections 36 and a series of output connections 38, by means of which operating parameters are known in a manner known per se of the internal combustion engine and the injection system are detected and evaluated via the input connections 36 and signals are generated at the output connections 38 with which the electrical and electronic components of the
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10355411A DE10355411B3 (en) | 2003-11-27 | 2003-11-27 | Injection system and injection method for an internal combustion engine |
PCT/EP2004/052775 WO2005052355A1 (en) | 2003-11-27 | 2004-11-03 | Injection unit and injection method for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1687523A1 true EP1687523A1 (en) | 2006-08-09 |
EP1687523B1 EP1687523B1 (en) | 2009-01-21 |
Family
ID=34625296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04819234A Expired - Fee Related EP1687523B1 (en) | 2003-11-27 | 2004-11-03 | Injection unit and injection method for an internal combustion engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US7318417B2 (en) |
EP (1) | EP1687523B1 (en) |
JP (1) | JP4404906B2 (en) |
CN (1) | CN100443713C (en) |
DE (2) | DE10355411B3 (en) |
WO (1) | WO2005052355A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007285235A (en) * | 2006-04-18 | 2007-11-01 | Honda Motor Co Ltd | Fuel supply device for diesel engine |
US7681555B2 (en) * | 2006-05-23 | 2010-03-23 | Delphi Technologies, Inc. | Controller for a fuel injector and a method of operating a fuel injector |
US8214007B2 (en) | 2006-11-01 | 2012-07-03 | Welch Allyn, Inc. | Body worn physiological sensor device having a disposable electrode module |
FR2921440A3 (en) * | 2007-09-20 | 2009-03-27 | Renault Sas | Fuel injecting device for e.g. diesel engine, has sensor for measuring return pressure of fuel passing through return pipe, and pressure regulating unit for regulating return pressure based on measurements carried by sensor |
DE102007052092B4 (en) * | 2007-10-31 | 2011-06-01 | Continental Automotive Gmbh | Method and fuel system for controlling the fuel supply for an internal combustion engine |
US7640919B1 (en) | 2008-01-31 | 2010-01-05 | Perkins Engines Company Limited | Fuel system for protecting a fuel filter |
CN101806266B (en) * | 2010-03-04 | 2012-07-11 | 哈尔滨工程大学 | Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector |
WO2012031636A1 (en) * | 2010-09-10 | 2012-03-15 | Lemoptix Sa | A method and device for projecting an image |
JP2012167559A (en) * | 2011-02-10 | 2012-09-06 | Denso Corp | Fuel injection device |
DE102011081161A1 (en) * | 2011-08-18 | 2013-02-21 | Continental Automotive Gmbh | Control and driving method for a piezoelectric actuator |
CN104066965B (en) | 2011-11-01 | 2017-05-10 | 康明斯公司 | Fuel injector with injection control valve assembly |
US9734304B2 (en) | 2011-12-02 | 2017-08-15 | Lumiradx Uk Ltd | Versatile sensors with data fusion functionality |
US9700222B2 (en) | 2011-12-02 | 2017-07-11 | Lumiradx Uk Ltd | Health-monitor patch |
DE102017220328A1 (en) * | 2017-11-15 | 2019-05-16 | Robert Bosch Gmbh | Vibration damping arrangement for injection systems of motor vehicles, in particular for fuel injection systems, and injection system with such a vibration damping arrangement |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3742241A1 (en) * | 1987-02-14 | 1988-08-25 | Daimler Benz Ag | Piezocontrol valve for controlling fuel injection via an injection valve in internal combustion engines |
DE19649139B4 (en) * | 1995-12-08 | 2007-05-10 | Volkswagen Ag | Injection device for internal combustion engines |
DE19742320A1 (en) * | 1997-09-25 | 1999-04-01 | Bosch Gmbh Robert | Fuel injector |
IT1296143B1 (en) * | 1997-11-18 | 1999-06-09 | Elasis Sistema Ricerca Fiat | CONTROL DEVICE FOR A FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINES. |
DE19822503C1 (en) * | 1998-05-19 | 1999-11-25 | Siemens Ag | Control valve for fuel injector |
DE19905340C2 (en) * | 1999-02-09 | 2001-09-13 | Siemens Ag | Method and arrangement for presetting and dynamic tracking of piezoelectric actuators |
US6253736B1 (en) * | 1999-08-10 | 2001-07-03 | Cummins Engine Company, Inc. | Fuel injector nozzle assembly with feedback control |
DE19938169A1 (en) * | 1999-08-16 | 2001-03-01 | Bosch Gmbh Robert | Fuel injector |
JP4048699B2 (en) * | 1999-11-10 | 2008-02-20 | 株式会社デンソー | Fuel injection valve |
DE10001099A1 (en) * | 2000-01-13 | 2001-08-02 | Bosch Gmbh Robert | Control valve for injector of fuel injection system for internal combustion engine; has regulator connected to pressure piston to separate control chamber from control valve and increase pressure |
DE10015740C2 (en) * | 2000-03-29 | 2003-12-18 | Siemens Ag | Injection valve for injecting fuel into an internal combustion engine |
EP1138912A1 (en) * | 2000-04-01 | 2001-10-04 | Robert Bosch GmbH | Online optimization of injection systems having piezoelectric elements |
DE10104634A1 (en) * | 2001-02-02 | 2002-09-19 | Bosch Gmbh Robert | Fuel injection system has collector line used as pressure store |
DE10109610A1 (en) * | 2001-02-28 | 2002-09-05 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
DE10113654A1 (en) * | 2001-03-21 | 2002-09-26 | Bosch Gmbh Robert | Fuel fine injection device for internal combustion engines |
DE10149004C1 (en) * | 2001-10-04 | 2003-02-27 | Bosch Gmbh Robert | Fuel injection device for IC engine has compression piston displaced in compression space provided with annular shoulder defining second compression space |
KR100820024B1 (en) * | 2002-05-14 | 2008-04-07 | 가부시키가이샤 미쿠니 | Electronic control fuel injection device |
-
2003
- 2003-11-27 DE DE10355411A patent/DE10355411B3/en not_active Expired - Fee Related
-
2004
- 2004-11-03 CN CNB2004800353296A patent/CN100443713C/en not_active Expired - Fee Related
- 2004-11-03 WO PCT/EP2004/052775 patent/WO2005052355A1/en not_active Application Discontinuation
- 2004-11-03 JP JP2006540426A patent/JP4404906B2/en not_active Expired - Fee Related
- 2004-11-03 DE DE502004008927T patent/DE502004008927D1/en active Active
- 2004-11-03 US US10/596,001 patent/US7318417B2/en not_active Expired - Fee Related
- 2004-11-03 EP EP04819234A patent/EP1687523B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005052355A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1886589A (en) | 2006-12-27 |
DE502004008927D1 (en) | 2009-03-12 |
US20070095329A1 (en) | 2007-05-03 |
DE10355411B3 (en) | 2005-07-14 |
US7318417B2 (en) | 2008-01-15 |
JP2007512463A (en) | 2007-05-17 |
WO2005052355A1 (en) | 2005-06-09 |
CN100443713C (en) | 2008-12-17 |
JP4404906B2 (en) | 2010-01-27 |
EP1687523B1 (en) | 2009-01-21 |
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