EP2126371A1 - Ensemble vanne - Google Patents

Ensemble vanne

Info

Publication number
EP2126371A1
EP2126371A1 EP08707119A EP08707119A EP2126371A1 EP 2126371 A1 EP2126371 A1 EP 2126371A1 EP 08707119 A EP08707119 A EP 08707119A EP 08707119 A EP08707119 A EP 08707119A EP 2126371 A1 EP2126371 A1 EP 2126371A1
Authority
EP
European Patent Office
Prior art keywords
valve
control
pressure
arrangement according
sub
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
Application number
EP08707119A
Other languages
German (de)
English (en)
Other versions
EP2126371B1 (fr
Inventor
Winfried RÜB
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydac Fluidtechnik GmbH
Original Assignee
Hydac Fluidtechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hydac Fluidtechnik GmbH filed Critical Hydac Fluidtechnik GmbH
Publication of EP2126371A1 publication Critical patent/EP2126371A1/fr
Application granted granted Critical
Publication of EP2126371B1 publication Critical patent/EP2126371B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
    • F15B2211/40561—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged upstream of the flow control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6055—Load sensing circuits having valve means between output member and the load sensing circuit using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87177—With bypass
    • Y10T137/87185—Controlled by supply or exhaust valve

Definitions

  • the invention relates to a valve arrangement having an adjustable directional control valve with a control slide for controlling at least one load connection and with a LS control line, wherein the differential pressure of two control pressures ⁇ a , Xb is used to control the control slide.
  • Valve arrangements of the type mentioned are increasingly being realized in the manner of modular building valve kits, which open up the possibility, in addition to the realization of standard variants to capture a certain number of special variants with.
  • these special variants not only increase the design cost of construction for the variant itself, but also the volume of space available within the standard valve assembly.
  • a typical case with electrically controlled valves is the user's desire to be able to perform a pressure or independent switching function in addition to the control of the directional control valve.
  • the function "quantity cutoff" is used, in which a pressure limit in the feedforward control of a pressure compensator closes the control cross section of the pressure compensator in the inflow to the valve gate of the directional control valve whose one the maximum inlet pressure to the two service connections (pipe connection) A or B or A and B can be set.
  • the adjustment of the screws is done regularly by hand, which is associated with interruptions in work on the machine.
  • a valve arrangement for controlling a consumer is known with a continuously variable directional control valve acting as inlet throttle, via which a pump connection with consumer connections A, B can be connected, the respective consumer being connected to the directional control valve via working lines and in each case Working line a throttle device is arranged, via which the outflow volume flow of the hydraulic oil is adjustable by the consumer.
  • the throttle device has two return throttles, which are each assigned to a useful connection A or B.
  • Each pertinent return throttle is provided with a tank port T and there is a permanent connection between the return throttles and the respective assignable control pressures ⁇ a , xt>, which act as a control pressure in the opposite direction to the spool with supply aperture of the directional control valve.
  • the pertinent way valve has so far no tank connection T.
  • the respective return throttle is controlled via a total of two independent proportional solenoids, which provide the said control pressures Xa, Xb available.
  • the summarized in a valve block known valve assembly in turn is relatively large.
  • a LS control arrangement with a directional control valve via its valve slide when setting in one direction a first consumer port A and setting in the other direction, a second consumer port B with a supply port P and the respectively
  • Other consumer connection with a drain port T are connectable, via an inlet control edge, an opening cross-section of a Zulaufmeßblende is determined, which in turn is associated with an indi- dual pressure compensator for keeping the pressure drop across the Zulaufmeßblende, and with a LS Steuerölströmungspfad, via which the load pressure downstream of Zulaufmeßblende can be tapped and by the valve spool in a LS control chamber of the directional control valve is signaled, wherein a maximum pressure in the LS control oil flow path can be limited via a pressure relief valve.
  • the LS control oil flow path is set during the adjustment of the valve Slider in one direction can be connected successively or overlapping with two pressure limiting chambers, each of which a pressure relief valve for LS-pressure limitation is assigned, a multi-stage supply pressure limit is possible and the load pressure can be limited to different values in different Hub Ruthen the valve spool, which for certain Tasks in mobile work equipment is advantageous; Stepless adjustment processes are not possible with the known solution.
  • a related object solves a valve assembly with the features of claim 1 in its entirety.
  • control pressures Xa, Xb additionally control a logic valve, which in turn acts on an additional valve and / or controls a pressure compensator, which is connected upstream of the directional control valve with spool moves the difference of the two control pressures ⁇ a , Xb first the spool of the directional control valve, wherein the higher or lower of the two control pressures Xa, Xb either the further valve activates acts in the form of the additional valve and / or on the pressure compensator.
  • the two proportional solenoids which are preferably provided for the provision of the actuation pressures Xa, Xb, are operated simultaneously, the selection of the higher or lower pilot pressure as actuation pressure ⁇ a , Xb being effected by a logic valve, which is preferably in the form of a shuttle valve or inverted shuttle valve.
  • the additional valve is a pressure limiting valve DBV, in particular a LS-DBV in the valve section. Since the control of a high-pressure pressure relief valve is carried out with low pressure, preferably a pressure booster stage is interposed.
  • the further valve or additional valve can also be designed in the manner of a pilot-operated check valve RV. For the unlocking of a pertinent high-pressure RV, a pressure transmission is again necessary.
  • a back pressure ( ⁇ a , Xb) for calibrating the opening point of a directional valve axis on the RV.
  • Any calibration values can be stored via integrated valve electronics. In this case, there is no choice between the higher or the lower pilot pressure, because the correspondingly releasable check valve RV is assigned in each case only a pilot pressure, so far as the RV takes over the function of the logic valve with.
  • valve assembly according to the invention will be explained with reference to various embodiments according to the drawings. This show in a schematic representation in the manner of schematics the
  • FIG. 1 to 4 four different embodiments of the valve assembly according to the invention, wherein the Fig.1 relates to the basic basic structure of the valve assembly.
  • FIG. 1 shows a valve arrangement with an adjustable directional control valve 10 with a control slide 12 (FIG. 2ff) for actuating two consumer connections A, B.
  • the structure of such adjustable directional control valves 10 with control slide 12 is well known in the prior art (EP 0 935 713 BI, DE 10 2005 050 169 A1), so that will not be discussed further here at this point.
  • the directional control valve 10 is further connected to a pressure supply source P, for example in the form of a constant pressure pump, which withdraws from a reservoir, for example in the form of a tank, hydraulic medium, which flows back through a tank port T after passing through the hydraulic circuit back into said reservoir.
  • a pressure supply source P for example in the form of a constant pressure pump, which withdraws from a reservoir, for example in the form of a tank, hydraulic medium, which flows back through a tank port T after passing through the hydraulic circuit back into said reservoir.
  • a pressure supply source P for example in the form of a constant pressure pump, which withdraw
  • the directional control valve 10 has an LS control line, which is shown in the figures with LS.
  • the differential pressure of two control pressures ⁇ a , Xb is provided, in the usual and therefore unspecified manner via two pilot valves 14,16 are given.
  • the pilot valves 14,16 are shown in Figs. 2ff, wherein the terminal ST the control pressure (usually 20 to 40 bar) referred to in the control oil circuit, which serves in particular to supply the unspecified low-pressure consumer.
  • the LS control line according to FIGS. to 3 provided with a throttle or aperture 18.
  • control pressures Xa, Xb not only act in the opposite direction on the spool 12 of the directional valve 10, but are also connected in opposite directions of action to a logic valve 20, which is particularly preferred as a shuttle valve and according to the present embodiments is designed as an inverted acting shuttle valve.
  • the control pressure ⁇ a acting on the control spool 12 enables the fluid-conducting connection between the connections P and A and the control pressure Xb acts on the control spool 12 in the opening direction of the connections P and B to be connected to one another.
  • an additional valve 22 is connected, which is designed as a pressure relief valve DBV.
  • a pressure-conversion stage 24 is connected on the input side, which makes it possible to bring the inlet pressure from the outlet side of the logic valve 20 to a higher pressure relative to the inlet side of the additional valve 22.
  • a pressure compensator 26 to switch on its one control input side to the pertinent supply line 28 is connected and on the counter-acting control input side, this is connected to a node 30, in which the LS control line opens and a fluid connection for the additional valve 22 in the form of a pressure relief valve with connected pressure translation stage 24.
  • the additional valve 22 is designed as a so-called.
  • LS pressure relief valve (LS-DBV) and is powered by the LS-pressure of the LS control line and controls, as explained, so far the the control spool 12 of the directional control valve 10 upstream section pressure compensator 26 at ,
  • the LS-DBV is driven by the lower of the two drive pressures ⁇ a , Xb on its spring side, again selecting the drive pressures ⁇ a , Xb by the inverted shuttle valve as logic valve 20. Since usually the spool 12 is deflected with a lower control pressure Xa, Xb, this low pressure must also control the high-pressure LS-DBV as an additional valve 22.
  • the pressure transmission stage 24 which is connected between the control pressure and the so-called spring chamber of the LS-DBV, wherein the pressure booster piston (not shown) is designed in such a way that, with its large area, it is connected to the control pressure. is located and the small surface of the spring chamber of the LS-DBV is applied.
  • the electrically adjustable quantity reduction is advantageously possible.
  • the valve arrangement according to FIG. 3 has a tank connection T for the section pressure compensator 26.
  • the pertinent T-port of the pressure compensator 26 can only be opened when the pressure compensator piston 32 has already almost closed the supply channel P (supply line 28) or just closed or already closed when moving against the control spring 34. This can not only a pressure relief in the inlet to the respective pipe connection (user port A, B) can be achieved, but also a pressure control.
  • the node 30 with throttle or fixed diaphragm 18 is omitted, and the LS control line is connected via a pressure sensor 36 to a microprocessor or microcontroller MC of a valve electronics (not shown).
  • said control line opens into a connecting line 40 between the additional valve 22 and a drive side of the pressure compensator 26.
  • the further valve is designed as an additional valve 22 in the form of a so-called.
  • LS pressure control valve which is not the LS pressure in the LS control line, but is fed by the pressure of the pressure supply source P and thus generates an artificial load pressure in the spring chamber of the section pressure compensator 26, which can be varied from zero to Pmax. Regardless of the actual load pressure, the pressure difference can thus be adjusted almost arbitrarily by electrical means. In this way, an extreme fine control at low pressure difference and maximum pumping amount via the section at maximum pressure difference is possible.
  • the measurement of the load pressure is carried out via a pressure sensor 36, which forwards the pressure value to a microprocessor or microcontroller MC as part of an unspecified valve electronics.
  • the valve electronics then control the low control pressure after specification of an external setpoint and simultaneously corrects the higher control pressure by the zero-point correction of the lower control pressure.
  • Another advantageous application of the pertinent solution is to provide a non-illustrated control block of a specific nominal diameter, in which only a single consumer connection (Nutzan- conclusion A, B) requires a larger nominal size. Then, for cost-saving reasons, the smaller control block can be maintained, because the necessary large amount can be reached via a high pressure difference across the metering orifice formed by the inlet side of the valve spool 12 (inlet of the supply line 28).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un ensemble vanne comprenant un distributeur réglable (10), pourvu d'un tiroir de commande (12) servant à piloter au moins un raccord de consommateur (A, B) et d'une conduite de commande LS, la différence de pression entre deux pressions de pilotage (X<SUB>a</SUB>, X<SUB>b</SUB>) servant au pilotage du tiroir de commande (12). Du fait que les pressions de pilotage (X<SUB>a</SUB>, X<SUB>b</SUB>) pilotent également une vanne logique qui agit à son tour sur une vanne supplémentaire et/ou pilote une balance de pression placée en amont du distributeur (10) à tiroir de commande (12), la différence entre les deux pressions de pilotage (X<SUB>a</SUB>, X<SUB>b</SUB>) anime d'abord le tiroir de commande du distributeur, la plus haute ou la plus basse des deux pressions de pilotage (X<SUB>a</SUB>, X<SUB>b</SUB>) pilotant l'autre vanne sous forme de vanne supplémentaire et/ou influant sur la balance de pression.
EP20080707119 2007-03-27 2008-01-18 Ensemble vanne Not-in-force EP2126371B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710014550 DE102007014550A1 (de) 2007-03-27 2007-03-27 Ventilanordnung
PCT/EP2008/000362 WO2008116515A1 (fr) 2007-03-27 2008-01-18 Ensemble vanne

Publications (2)

Publication Number Publication Date
EP2126371A1 true EP2126371A1 (fr) 2009-12-02
EP2126371B1 EP2126371B1 (fr) 2012-04-11

Family

ID=39316144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080707119 Not-in-force EP2126371B1 (fr) 2007-03-27 2008-01-18 Ensemble vanne

Country Status (4)

Country Link
US (1) US8479636B2 (fr)
EP (1) EP2126371B1 (fr)
DE (1) DE102007014550A1 (fr)
WO (1) WO2008116515A1 (fr)

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PL2325390T5 (pl) * 2009-10-20 2019-12-31 Joseph Vögele AG Deska równająca i zespół maszynowy do budowy dróg
DE102011118225A1 (de) * 2011-11-12 2013-05-16 Knocks Fluid-Technik GmbH Präzisionsvolumenstrombooster
DE102014005410A1 (de) * 2014-03-01 2015-09-03 Hydac Filtertechnik Gmbh Ventilvorrichtung
KR102389687B1 (ko) * 2015-01-14 2022-04-22 현대두산인프라코어 주식회사 건설기계의 제어 시스템
US20170023149A1 (en) * 2015-07-22 2017-01-26 Cnh Industrial America Llc Hydraulic signal control system and method

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Also Published As

Publication number Publication date
US8479636B2 (en) 2013-07-09
DE102007014550A1 (de) 2008-10-09
EP2126371B1 (fr) 2012-04-11
US20100018198A1 (en) 2010-01-28
WO2008116515A1 (fr) 2008-10-02

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