WO2006000483A1 - Verfahren zur erfassung mindestens einer ventilhubposition bei einer brennkraftmaschine mit variabler ventilsteuerung - Google Patents
Verfahren zur erfassung mindestens einer ventilhubposition bei einer brennkraftmaschine mit variabler ventilsteuerung Download PDFInfo
- Publication number
- WO2006000483A1 WO2006000483A1 PCT/EP2005/051737 EP2005051737W WO2006000483A1 WO 2006000483 A1 WO2006000483 A1 WO 2006000483A1 EP 2005051737 W EP2005051737 W EP 2005051737W WO 2006000483 A1 WO2006000483 A1 WO 2006000483A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- pressure
- time
- hydraulic pressure
- internal combustion
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
Definitions
- the invention is based on a method for detecting at least one Ventilhub ⁇ position in a Brenrikraömaschine with valves that are operated variably by applying a hydraulic pressure rule according to the preamble of the independent claim.
- the present invention also provides an apparatus for operating a valve control, in particular a control unit of an internal combustion engine, and a computer program product for applying the method according to the invention to a computer or control unit.
- the gas exchange takes place via spring-loaded valves which are opened by a camshaft.
- the time profile of the valve lift that is to say the beginning and duration of the valve opening or position of the valve tappet, are determined by the shape of the camshaft but not variable.
- concepts for the variable control of gas exchange valves are increasingly being used. For example, by varying the phase position of the camshaft, the inlet and outlet times of gas exchange valves can be varied.
- a flexible operation of an internal combustion engine is possible if the gas exchange valves are not directly controlled via a camshaft, but directly. From WO 91/03384, for example, a fully variable valve control is known in which the gas exchange valves are electromagnetically or hydraulically activated.
- the valve lift is detected by a valve lift sensor
- valve lift is necessary to ensure proper operation of the engine and u.a. To avoid misfires or collisions of the gas exchange valves with the piston.
- DE 10064650 describes a method for controlling gas exchange valves of an internal combustion engine with a variable valve lift.
- the control of the valve takes place as a function of an evaluation of a pressure in the combustion chamber of the engine, the evaluation of the combustion chamber crack essentially serving to calibrate an existing valve lift sensor.
- the method according to the invention with the features of the independent claim has the advantage that at least one valve lift position is determined by means of a change in a hydraulic pressure applied to the valve. As a result of this procedure, a valve lifting position can advantageously also be determined without the presence of a valve lift sensor.
- valve opening time and closing time can be determined from a point in time when the pressure falls below a threshold value. This has the advantage that, if the threshold value is suitably selected, it may passing pressure fluctuations have no influence on the determination of the relevant opening and closing times.
- a time profile of a valve lift is determined based on at least one valve lift position and / or the time profile of the hydraulic pressure.
- an apparatus for operating a valve control in particular a control unit of a Brennkraftmaschi ⁇ ne that is programmed to use a method for detecting a valve lift.
- a control unit of a Brennkraftmaschi ⁇ ne that is programmed to use a method for detecting a valve lift.
- a computer program product is provided, with program code stored on a machine-readable carrier, so that advantageously a method for detecting a valve lift is used as soon as the program is executed on a computer or control unit
- FIG. 1 shows schematically an electrohydraulically operable valve
- Figure 2 shows schematically the timing of the switching states of the controlled solenoid valves and corresponding characteristics
- Figure 3 shows a flow chart for detecting malfunctions of a hydraulic valve
- FIG. 4 schematically shows a logic circuit for error detection
- the invention is based on the consideration that changes in an electro-hydraulic valve control system by switching control valves, the hydraulic pressure.
- an electrohydraulic valve for example a gas exchange valve
- the control valves for example.
- Solenoid valves are switched in a certain sequence, so that the hydraulic pressure in the system changes in a tikisti ⁇ rule manner. Since the characteristic pressure changes are repeated in a reproducible manner each time the electrohydraulic valve is opened and closed, the knowledge of the pressure curve in the hydraulic system makes it possible to deduce further system variables, for example a valve lift and / or a valve lift position.
- Figure 1 shows schematically an electro-hydraulically actuated valve 1, for example, a gas exchange valve of an internal combustion engine, a sliding slide 30 separates the pressure range of the valve 1 in an upper chamber 10 and in a lower chamber 20.
- the slider 30 In the direction of the upper chamber 10, the slider 30 is connected to a guide tappet 50 and in the direction of the lower chamber 20 with a valve stem 40.
- the lower chamber 20 is connected to the high-pressure side of the hydraulic system or high-pressure manifold / rail HD rail via an initial check valve RV 1.
- the first check valve RVl prevents backflow from the lower chamber 20 back into the high-pressure rail HD rail.
- the lower chamber 20 is connected to the upper chamber 10 via a normally closed solenoid valve MVl.
- both chambers 10, 20 are connected to a second non-return valve RV2 which relaxes in the direction of the high-pressure rail.
- the upper chamber 10 is further connected via a second normally open solenoid valve MV2 with a low-pressure rail.
- the pressure p rail in the high pressure rail is detected by a pressure sensor.
- An electrohydraulic valve is thus understood to mean a valve which is moved by applying a hydraulic pressure, wherein the hydraulic pressure is controlled or switched in accordance with the desired valve movement via electrically controllable control valves.
- the electrohydraulic valve 1 is designed as a gas exchange valve
- a valve plate is arranged at one end of the valve tappet 40 which fits into a valve seat of a combustion chamber when the gas exchange valve is closed.
- the valve stem 40 and the valve plate projects into the combustion chamber.
- the first solenoid valve MVl is closed and the second solenoid valve MV2 open.
- the hydraulic pressure in the lower chamber 20 is thus greater than in the upper chamber 10. Due to this pressure difference, the slide 30 moves in the direction of the upper chamber 10 until the hydraulic valve reaches an end position and is closed.
- the solenoid valves MVl, 2 are energized, the first solenoid valve MVl is open and the second solenoid valve MV2 is closed.
- the hydraulic pressure in the upper and lower chambers 10, 20 is thus substantially equal.
- the area of the slider 30 is greater in the upper chamber 10 than in the lower chamber 20, so that the force acting on the slider 30 by the hydraulic pressure moves the slider 30 toward the lower chamber 20 and opens the hydraulic valve 1
- the invention is not limited to the exemplary embodiment shown, but is equally applicable to other switchable hydraulic arrangements.
- the hydraulic shading or the position of the pressure sensor can be varied.
- Figure 2 shows schematically the timing of the switching states of the controlled solenoid valves MVl, 2 and corresponding characteristics such as pressure curve p rail in the high-pressure rail and the valve lift S GSW of the hydraulic valve, the left diagram, the operations at the opening and the right when closing operations of the electro-hydraulic valve 1 represents.
- the first solenoid valve MV1 is closed and the second solenoid valve MV2 is open, the pressure in the high-pressure rail p rail is substantially constant, and the electrohydraulic valve 1 or gas exchange valve is closed.
- the electrohydraulic valve is opened by first closing the second solenoid valve MV2 and then opening the first solenoid valve MVl. After the electrohydraulic valve has reached its end position - fully open - the first solenoid valve MV1 is closed.
- the time profile of the pressure drop or relevant pressure changes and in particular also the time tjpmax, at which the pressure has fallen to the maximum, depend in a given system essentially on the operating state of the electrohydraulic Valve off.
- Essential influencing factors are, for example, the geometry and length of the hydraulic lines, the hydraulic pressure and the temperature of the hydraulic fluid.
- Other variables which may be considered include the temperature and speed of the internal combustion engine, the speed of the ram movement, pressure conditions in the combustion chamber, and possibly further variables.
- the temporal pressure curve p rail in the high-pressure rail can now be associated with the valve lift or travel S GWV of the electrohydraulic valve or gas exchange valve. It is thus possible, under known operating conditions, to determine from the pressure course in the high-pressure rail and / or a maximum pressure drop and / or further relevant pressure changes an actually present valve lift and / or in particular a valve opening time t_o.
- Relevant pressure changes essentially mean all pressure changes or events by means of which it is possible to conclude the valve lift or valve lift positions.
- Relevant pressure changes are, for example, in question, a first pressure drop, falling below a threshold value, extreme pressure values, minimum or maximum values, saddle points and others. The relevance of these points can be further increased by observing only relevant pressure changes in a preferred time interval.
- valve lift S GWV of an opening gas exchange valve shows the time profile of the valve lift S GWV of an opening gas exchange valve. Due to, for example, friction and hydraulic resistances, opening of the electrohydraulic valve 1 can not be observed immediately after the opening of the first solenoid valve, but takes place with a system-related time delay.
- valve opening time t_o or the valve closing time t_s it is not absolutely necessary to take into account the entire temporal pressure curve in the high-pressure rail, but it is sufficient to determine the time of a characteristic reproducible pressure change.
- the maximum pressure drop in the high-pressure rail at a time t_pmax serve, which is typically expected in a time interval [tl, t2] after switching a Mag ⁇ netventils. If this time tjpmax is determined, the valve opening time t_o or the closing time t_s can be determined via a corresponding model.
- a maximum pressure drop is observed in a time interval [tl, t2] at a time t_pmax. If the operating conditions of the electrohydraulic valve and this time tjnax are known, a valve closing time t_s can be determined from this.
- the time intervals [tl, 12], the time tjpmax and closing time t_s and opening time t_o may be different for the closing or opening operation of the valve. In particular, these sizes may be different for different valves and cylinders.
- valve opening t_o and valve closing t_s are the time at which the valve sets in motion for the first time.
- This first movement is typically carried out with a system-related time delay after the switching of the relevant control valve MVl or MV2.
- MVl the relevant control valve
- MV2 the closing or opening time taking into account the system-related time delay on the basis of the switching times of the control valves MVl, MV2.
- this is only an expected opening or closing time without a check of the actual opening or closing operation.
- FIG. 3 schematically shows a flow chart of a possible monitoring procedure. It is assumed that the pressure ⁇ _rail in the high-pressure rail is determined at regular, short intervals.
- a step 600 all measurement times t_m which fall into a time interval [t1, t2] relevant to a respective cylinder n are detected with the respective pressures p rail.
- step 610 a maximum value pmax is determined from the pressures pjrail detected in the time interval [t1, t2].
- step 620 it is checked whether this maximum value pmax exceeds a threshold value S_p. If the threshold value Sjp is exceeded, a release of the corresponding gas exchange valve takes place in step 650. If the threshold value S_p is not exceeded, the corresponding gas exchange valve is blocked in step 680 and, if appropriate, the associated cylinder is switched off.
- FIG. 4 shows a possible logic circuit arrangement for checking gas exchange valves of a four-cylinder combustion machine.
- the arrangement comprises a microprocessor 500, a comparator 400 and four AND elements with two inputs.
- the microprocessor 500 determines a pressure threshold value Sjp, which forms an input variable of the comparator 400, and continues cylinder-specific during a specific time interval [tl, t2] _Z_l, 2,3,4 a second Ein ⁇ gang of an AND gate to the logical value TRUE.
- the comparator 400 compares the pressure p rail in the high-pressure rail with the pressure threshold S_p provided by the microprocessor 500 and sets all first inputs of the AND elements to the logical value TRUE when the pressure p rail in the high-pressure rail reaches the pressure threshold S_p exceeds. As soon as TRUE signals are present at both inputs of an AND element, a logical value TRUE is passed on, thus signaling the proper functioning of a gas exchange valve for this cylinder.
- the logic outputs of the AND elements can be monitored, for example, by a control unit, wherein an error reaction is initiated in the case of logic values which indicate a faulty functioning of the valves. If, for example, the time t_pmax of the maximum pressure drop lies outside the permissible time interval [t1, 12], then a TRUE signal for the time interval [t1, t2] is present at the AND element.
- the "tjpmax" signal is j e- but not before and is set to FALSE, so that the AND gate outputs a FALSE signal.
- the rail pressure p rail in the high-pressure rail is detected continuously or at specific time intervals.
- the detected pressure values are preferably filtered in order to hide disturbing influences.
- the pressure changes for example the time derivative of the pressure profile, can also be taken into account.
- a time window is opened after opening the first solenoid valve MVl or after opening the second solenoid valve MV2 via a microprocessor or a separate time control for the associated time interval [tl, tl] during which the rele ⁇ vant pressure signals are detected.
- the detected pressure signals are evaluated and an opening time t_o or closing time t_s of the monitored gas exchange valve determined.
- the calculated times are forwarded to a control unit for further processing.
- the inventive method is either already integrated as hardware or as software in a control unit of an internal combustion engine.
- the detection of the pressure signals is typically carried out in a characteristic for operation of the Steuerge ⁇ device or internal combustion engine clock frequency, for example, based on bus clocks or crankshaft angles, positions.
- the clock frequencies can be easily converted into another reference system.
- the crankshaft angle is preferably selected as the reference variable.
- the opening and closing angles of the gas exchange valves can be determined from pressure changes in the hydraulic system.
- the pressure and in particular the pressure changes in the hydraulic system are influenced by a large number of variables.
- the time delay is mainly due to the length of the hydraulic path between the valve and Drackress, pressure and temperature of the hydraulic fluid additionally affect the delay time.
- the valve lift can be represented as a function of pressure and temperature of the hydraulic fluid and stored, for example, as a function or characteristic value table in a control unit.
- the deposit as characteristic value table is particularly suitable if computer time is to be saved in the control unit or if the values, for example, have not been determined empirically via a modeling.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/630,719 US20080147291A1 (en) | 2004-06-23 | 2005-04-20 | Method For Detecting At Least One Valve Lift Position In An Internal Combustion Engine Having Variable Valve Control |
EP05735608A EP1761685A1 (de) | 2004-06-23 | 2005-04-20 | Verfahren zur erfassung mindestens einer ventilhubposition bei einer brennkraftmaschine mit variabler ventilsteuerung |
JP2007517224A JP2008503686A (ja) | 2004-06-23 | 2005-04-20 | 可変弁制御を有する内燃機関における少なくとも1つの弁リフト位置の検出方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004030306A DE102004030306A1 (de) | 2004-06-23 | 2004-06-23 | Verfahren zur Erfassung mindestens einer Ventilhubposition bei einer Brennkraftmaschine mit variabler Ventilsteuerung |
DE102004030306.1 | 2004-06-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006000483A1 true WO2006000483A1 (de) | 2006-01-05 |
Family
ID=34965306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/051737 WO2006000483A1 (de) | 2004-06-23 | 2005-04-20 | Verfahren zur erfassung mindestens einer ventilhubposition bei einer brennkraftmaschine mit variabler ventilsteuerung |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080147291A1 (de) |
EP (1) | EP1761685A1 (de) |
JP (1) | JP2008503686A (de) |
DE (1) | DE102004030306A1 (de) |
WO (1) | WO2006000483A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008298078A (ja) * | 2007-06-01 | 2008-12-11 | Robert Bosch Gmbh | 弁に対する操作装置の制御方法および装置 |
JP2009068489A (ja) * | 2007-09-11 | 2009-04-02 | Robert Bosch Gmbh | 内燃機関の電気油圧式弁制御の作動方法および内燃機関の電気油圧式弁制御システム |
JP2011504563A (ja) * | 2007-11-23 | 2011-02-10 | エーエムペーアー・アイトゲネーシッシェ・マテリアルプリューフングス‐ウント・フォルシュングスアンシュタルト | 油圧作動式弁駆動装置およびこの弁駆動装置を用いる内燃機関 |
EP4311937A1 (de) | 2022-07-28 | 2024-01-31 | Prognost Systems GmbH | Verfahren zur automatischen überwachung einer kolbenmaschine, nach dem verfahren überwachbare kolbenmaschine und computerprogramm mit einer implementation des verfahrens |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT504981B1 (de) * | 2007-03-06 | 2013-06-15 | Ge Jenbacher Gmbh & Co Ohg | Ventilantrieb |
US8499746B2 (en) | 2007-07-12 | 2013-08-06 | Imagineering, Inc. | Internal combustion engine using electromagnetic wave radiation to activate burnt gas |
DE102008051955B4 (de) * | 2007-10-19 | 2019-07-11 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Verfahren und System zur Steuerung eines variablen Ventilhubsystems einer Brennkraftmaschine |
Citations (8)
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US4274438A (en) * | 1979-02-21 | 1981-06-23 | Westinghouse Electric Corp. | Method of diagnostic valve testing |
EP0353862A1 (de) * | 1988-08-01 | 1990-02-07 | Honda Giken Kogyo Kabushiki Kaisha | Versagensfeststellungsverfahren für die Brennkraftmaschinen mit variabler Ventilsteuerung |
JPH04171208A (ja) * | 1990-11-02 | 1992-06-18 | Nippon Soken Inc | 油圧駆動弁装置 |
JPH04301104A (ja) * | 1991-03-28 | 1992-10-23 | Honda Motor Co Ltd | 内燃機関用機関弁の油圧駆動装置 |
DE4218320A1 (de) * | 1992-06-03 | 1993-12-09 | Siemens Ag | Verfahren und Einrichtung zur Prüfung einer durch ein Medium angetriebenen Armatur |
US6321702B1 (en) * | 1998-06-12 | 2001-11-27 | Robert Bosch Gmbh | Process for controlling a gas exchange valve for internal combustion engines |
DE10138881A1 (de) * | 2001-08-08 | 2003-02-27 | Bosch Gmbh Robert | Verfahren zum Betreiben einer elektrohydraulischen Ventilsteuerung einer Brennkraftmaschine, Computerprogramm sowie Steuer- und Regelgerät zum Betreiben einer Brennkraftmaschine |
WO2004081350A1 (de) * | 2003-03-10 | 2004-09-23 | Robert Bosch Gmbh | Verfahren zum betreiben eines hydraulischen aktors, insbesondere eines gaswechselventils einer brennkraftmaschine |
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JP2688934B2 (ja) * | 1988-08-01 | 1997-12-10 | 本田技研工業株式会社 | 可変バルブタイミング型エンジンにおけるフェールセーフ制御方法 |
JP2619696B2 (ja) * | 1988-08-01 | 1997-06-11 | 本田技研工業株式会社 | エンジンにおけるバルブタイミングの切換制御方法 |
JP3521981B2 (ja) * | 1994-11-28 | 2004-04-26 | 株式会社小松製作所 | 建設機械の牽引力制御装置およびその制御方法 |
JPH11171492A (ja) * | 1997-12-15 | 1999-06-29 | Toyota Autom Loom Works Ltd | 産業車両におけるデータ設定装置及び産業車両 |
DE10106169A1 (de) * | 2001-02-10 | 2002-08-14 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Steuern eines Betriebs einer Brennkraftmaschine |
DE10314677A1 (de) * | 2003-04-01 | 2004-10-14 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine |
-
2004
- 2004-06-23 DE DE102004030306A patent/DE102004030306A1/de not_active Withdrawn
-
2005
- 2005-04-20 JP JP2007517224A patent/JP2008503686A/ja active Pending
- 2005-04-20 EP EP05735608A patent/EP1761685A1/de not_active Ceased
- 2005-04-20 US US11/630,719 patent/US20080147291A1/en not_active Abandoned
- 2005-04-20 WO PCT/EP2005/051737 patent/WO2006000483A1/de not_active Application Discontinuation
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US4274438A (en) * | 1979-02-21 | 1981-06-23 | Westinghouse Electric Corp. | Method of diagnostic valve testing |
EP0353862A1 (de) * | 1988-08-01 | 1990-02-07 | Honda Giken Kogyo Kabushiki Kaisha | Versagensfeststellungsverfahren für die Brennkraftmaschinen mit variabler Ventilsteuerung |
JPH04171208A (ja) * | 1990-11-02 | 1992-06-18 | Nippon Soken Inc | 油圧駆動弁装置 |
JPH04301104A (ja) * | 1991-03-28 | 1992-10-23 | Honda Motor Co Ltd | 内燃機関用機関弁の油圧駆動装置 |
DE4218320A1 (de) * | 1992-06-03 | 1993-12-09 | Siemens Ag | Verfahren und Einrichtung zur Prüfung einer durch ein Medium angetriebenen Armatur |
US6321702B1 (en) * | 1998-06-12 | 2001-11-27 | Robert Bosch Gmbh | Process for controlling a gas exchange valve for internal combustion engines |
DE10138881A1 (de) * | 2001-08-08 | 2003-02-27 | Bosch Gmbh Robert | Verfahren zum Betreiben einer elektrohydraulischen Ventilsteuerung einer Brennkraftmaschine, Computerprogramm sowie Steuer- und Regelgerät zum Betreiben einer Brennkraftmaschine |
WO2004081350A1 (de) * | 2003-03-10 | 2004-09-23 | Robert Bosch Gmbh | Verfahren zum betreiben eines hydraulischen aktors, insbesondere eines gaswechselventils einer brennkraftmaschine |
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PATENT ABSTRACTS OF JAPAN vol. 017, no. 117 (M - 1378) 11 March 1993 (1993-03-11) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008298078A (ja) * | 2007-06-01 | 2008-12-11 | Robert Bosch Gmbh | 弁に対する操作装置の制御方法および装置 |
JP2009068489A (ja) * | 2007-09-11 | 2009-04-02 | Robert Bosch Gmbh | 内燃機関の電気油圧式弁制御の作動方法および内燃機関の電気油圧式弁制御システム |
JP2011504563A (ja) * | 2007-11-23 | 2011-02-10 | エーエムペーアー・アイトゲネーシッシェ・マテリアルプリューフングス‐ウント・フォルシュングスアンシュタルト | 油圧作動式弁駆動装置およびこの弁駆動装置を用いる内燃機関 |
EP4311937A1 (de) | 2022-07-28 | 2024-01-31 | Prognost Systems GmbH | Verfahren zur automatischen überwachung einer kolbenmaschine, nach dem verfahren überwachbare kolbenmaschine und computerprogramm mit einer implementation des verfahrens |
DE102022207806A1 (de) | 2022-07-28 | 2024-02-08 | Prognost Systems Gmbh | Verfahren zur automatischen Überwachung einer Kolbenmaschine, nach dem Verfahren überwachbare Kolbenmaschine und Computerprogramm mit einer Implementation des Verfahrens |
Also Published As
Publication number | Publication date |
---|---|
EP1761685A1 (de) | 2007-03-14 |
DE102004030306A1 (de) | 2006-01-12 |
JP2008503686A (ja) | 2008-02-07 |
US20080147291A1 (en) | 2008-06-19 |
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