WO2009070358A1 - Dual redundant servovalve - Google Patents
Dual redundant servovalve Download PDFInfo
- Publication number
- WO2009070358A1 WO2009070358A1 PCT/US2008/074759 US2008074759W WO2009070358A1 WO 2009070358 A1 WO2009070358 A1 WO 2009070358A1 US 2008074759 W US2008074759 W US 2008074759W WO 2009070358 A1 WO2009070358 A1 WO 2009070358A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve member
- servovalve
- displacement sensor
- disposed
- fluid pathway
- Prior art date
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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/008—Valve failure
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
-
- 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
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8225—Position or extent of motion indicator
- Y10T137/8242—Electrical
-
- 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
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86622—Motor-operated
-
- 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
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/8667—Reciprocating valve
- Y10T137/86694—Piston valve
- Y10T137/86702—With internal flow passage
-
- 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
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/8667—Reciprocating valve
- Y10T137/86694—Piston valve
- Y10T137/8671—With annular passage [e.g., spool]
Definitions
- Conventional servovalves convert relatively low power electrical control input signals into a relatively large mechanical power output. For example, during operation pressurized fluid enters the direct drive servovalve and, based upon the control input signals, drives a fluid actuator to operate variable-geometry elements such as associated with an aircraft.
- a typical direct drive servovalve includes a housing, a valve member such as a spool, a motor, and a sensor.
- the housing defines a fluid pathway with the valve member being disposed within the fluid pathway.
- the motor is configured to move the valve member within the fluid pathway between an open and closed position in order to control an amount of fluid flow within the pathway.
- the sensor is configured to sense a position of the valve member within the fluid pathway and a rotational orientation of the motor's rotor assembly.
- an electronic controller receives a command signal from a user input device which directs the controller to operate the servovalve in a particular manner (e.g., increase flow, decrease flow, terminate flow, etc.).
- the controller also receives a position signal from the sensor thus enabling the controller to determine the present position of the valve member within the fluid pathway.
- the controller then sends a control signal to the motor based on both the command signal and the position signal to control the rotational orientation of the rotor assembly. As a result, the rotor assembly moves the valve member to a desired position within the fluid pathway thus controlling amount of fluid flow relative to the fluid actuator.
- Embodiments of the present invention relate to a servovalve that includes a single motor which actuates separate valve members of separate or redundant servovalve assemblies.
- Each of the valve members controls the flow of hydraulic fluid from separate hydraulic fluid sources to provide redundant control of a fluid actuator.
- each servovalve assembly includes a compression assembly that provides each servovalve assembly with a jam- override capability.
- the compression assembly is configured as a pair of pistons disposed within a channel defined by the valve member and each piston being preloaded by supply pressure against a corresponding stop in the valve member channel.
- a force generated by the valve member drive portion on the pistons is less than the preload forces exerted by the pistons on the stops. Accordingly, rotation of the rotor assembly causes each valve member to translate within its respective fluid pathway.
- a force generated by the valve member drive portion on one of the pistons of the jammed valve member is greater than the forces exerted by the piston on the corresponding stop.
- rotation of the rotor assembly causes the non- jammed valve member to translate within its respective fluid pathway and causes the valve member drive portion to displace one of the preloaded pistons relative to the stop.
- the compression assembly allows continuous operation of one of the servovalve assemblies of the servovalve in the event of a valve member of a second servovalve assembly of the servovalve becomes jammed.
- a servovalve in one arrangement, includes a motor having a rotor shaft defining a first end and a second end, the second end opposing the first end.
- the servovalve includes a first servovalve assembly having a first housing defining a first fluid pathway and a first valve member disposed within the first fluid pathway, the first valve member having a first compression assembly configured to apply a first preload to a first stop.
- the servovalve includes a second servovalve assembly having a second housing defining a second fluid pathway and a second valve member disposed within the second fluid pathway, the second valve member having a second compression assembly configured to apply a second preload to a second stop.
- the motor is configured to cause the rotor shaft to apply a first force to the first compression assembly and to the second compression assembly when the first valve member is translatable within the first fluid pathway and the second valve member is translatable within the second fluid pathway the first force being less than or equal to the first preload applied by the first compression assembly and the second preload applied by the second compression assembly.
- the motor is also configured to cause the rotor shaft to apply an increased force to one of the first compression assembly and the second compression assembly when one of the first valve member and the second valve member is not translatable within the respective one of the first fluid pathway and the second fluid pathway, the increased force being greater than one of the first preload applied by the first compression assembly and the second preload applied by the second compression assembly.
- a servovalve in one arrangement, includes a motor having a rotor shaft defining a first end and a second end, the second end opposing the first end.
- the servovalve includes a first servovalve assembly having a first housing defining a first fluid pathway and a first valve member disposed within the first fluid pathway, the first valve member having a first compression assembly configured to apply a first preload to a first stop.
- the servovalve includes a second servovalve assembly having a second housing defining a second fluid pathway and a second valve member disposed within the second fluid pathway, the second valve member having a second compression assembly configured to apply a second preload to a second stop.
- the servovalve includes a first displacement sensor carried by the first valve assembly, the first displacement sensor being configured to generate a position signal indicating a relative position of the first valve member within the first fluid pathway.
- the servovalve includes a second displacement sensor carried by the second valve assembly, the second displacement sensor being configured to generate a position signal indicating a relative position of the second valve member within the second fluid pathway.
- the servovalve includes a controller in electrical communication with the first displacement sensor.
- the controller is configured to receive a command signal from a user input device, receive a first position signal from the first displacement sensor, and receive a second position signal from the second displacement sensor and compare the command signal with the first position signal and the second position signal.
- the controller is configured to transmit a control signal to the motor to position the first valve member and the second valve member to a commanded position.
- Fig. 1 illustrates a schematic representation of a servovalve, according to one embodiment of the invention.
- Fig. 2 illustrates a schematic representation of a rotor assembly, valve member and compression assembly of Fig. 1.
- Fig. 3 illustrates a sectional view of the rotor assembly taken along line 3-3 in Fig. 2.
- Embodiments of the present invention relate to a servovalve that includes a single motor which actuates separate valve members of separate servovalve assemblies.
- Each of the valve members controls the flow of hydraulic fluid from separate hydraulic fluid sources.
- each servovalve assembly includes a compression assembly that provides each servovalve assembly with a jam-override capability.
- the compression assembly is configured as a pair of pistons disposed within a channel defined by the valve member and preloaded by supply pressure against a stop in the valve member.
- a force generated by the valve member drive portion on the pistons is less than the preload forces exerted by the pistons on the stop in the valve member. Accordingly, rotation of the rotor assembly causes each valve member to translate within its respective fluid pathway.
- a force generated by the valve member drive portion on the pistons of the jammed valve member is greater than the forces exerted by the pistons on the stop in the valve member. Accordingly, rotation of the rotor assembly causes the non-jammed valve member to translate within its respective fluid pathway and causes the valve member drive portion to compress one of the preloaded pistons relative to the jammed valve member. Accordingly, the compression assembly allows continuous operation of one of the servovalve assemblies of the servovalve in the event of a valve member of a second servovalve assembly of the servovalve becomes jammed.
- Fig. 1 shows an arrangement of a servovalve 24.
- the servovalve 24 includes two servovalve assemblies 26-1, 26-2, a motor such as a direct drive servovalve motor 28, two displacement sensors 30-1, 30-2, such as linear variable displacement transducers (LVDTs), and a controller 31 , such as a processor and memory.
- the controller 31 is configured to operate the direct drive servovalve motor 28 in order to control operation of the two servovalve assemblies 26-1, 26-2.
- Each servovalve assembly 26-1, 26-2 includes a housing 32-1, 32-2 defining a fluid pathway 34-1, 34-2.
- Each housing 32-1, 32-2 includes a sleeve 35, as shown in Fig.
- each servovalve assembly 26-1, 26-2 provides redundant control of the fluid actuator 33 where the first servovalve assembly 26-1 controls a first portion 33-1 of the fluid actuator 33 and the second servovalve assembly 26-2 controls a second portion 33-2 of the fluid actuator 33.
- Each housing 32-1, 32-2 includes valve control ports used to control the positioning of the valve members 36-1, 36-2 within its respective fluid pathway 34-1, 34-2.
- the housing 32-1 includes a supply input 38-1 to the fluid pathway 34-1 through which the fluid source 37-1 directs a pressurized hydraulic fluid.
- the housing 32-1 also includes first and second control outputs 40-1, 42-1 which direct the pressurized fluid from the fluid pathway 34-1 to the fluid actuator 33 as well as a return output 44-1 that directs the pressurized fluid to the reservoir of the fluid source 37-1.
- the direct drive servovalve motor 28 includes a stator 60 and a rotor assembly 62.
- the stator 60 is in a fixed position relative to the first and second valve assembly housings 32-1, 32-2, and the rotor assembly 62 is configured to rotate to particular angular positions relative to the stator 60 in response to particular currents passing through coils 64 of the stator 60.
- the rotor assembly 62 is configured to rotate within a limit arc range (e.g., +/- 20 degrees) in order to drive the valve members 36-1, 36-2 between a fully closed position and a fully open position within the respective fluid pathways 34-1, 34-2.
- the rotor assembly 62 includes a rotor shaft 68 having a first end 70 carried by the first valve member 36-1 and an opposing second end 72 carried by the second valve member 36-2.
- Each end 70, 72 includes a valve member drive portion 74-1 and 74-2 respectively configured to apply the rotary motion of the rotor shaft 68 to each respective valve member 36-1, 36-2 and cause each valve member 36-1, 36-2 to longitudinally translate 75 within each respective fluid pathway 34-1, 34-2, thereby modulating fluid flow through the valve control ports.
- the rotor shaft 62 includes valve member drive portions 74-1, 74-2 disposed at either end of the rotor shaft and carried by the valve members 36-1, 36-2. In one arrangement, as illustrated in Fig.
- the valve member drive portion 74-1 includes an eccentric drive element 76-1, such as a ball formed from a tungsten carbide material, coupled to the rotor shaft 68 at a location off-axis to an axis of rotation 78 of the rotor shaft 68.
- the direct drive servovalve motor 28 is configured to provide a force of about 100 pounds to each valve member 36-1, 36-2 via the respective valve member drive portions 74-1, 74-2.
- each servovalve assembly 26-1, 26-2 includes a compression assembly 46-1, 46-2 that provides each servovalve assembly 26-1, 26-2 with a jam-override capability, as will be described in detail below.
- the valve member 36-1 defines a channel 50 extending along a longitudinal axis 49-1 of the valve member 36-1.
- the channel 50 is disposed in fluid communication with the pressurized fluid source 37-1.
- the pressurized fluid source 37-1 For example, as illustrated in Fig.
- the fluid source 37-1 is coupled to the supply input 38-1 of the housing 32-1 and provides pressurized fluid to a first channel portion 51-1 defined within a first valve member 36-1 and to a second channel portion 53-1 defined within the first valve member 36-1.
- Each channel portion 51-1, 53-1 defines a corresponding stop 57-1, 59-1.
- each stop 57-1, 59-1 corresponds to a reduction in diameter of each corresponding channel portion 51-1, 53-1.
- the compression assembly 46-1 includes a first piston 56-1 disposed within the first channel portion 51-1 and a second piston 58-1 disposed within the second channel portion 53-1.
- the pressurized fluid contained within the first and second channel portions 51-1, 53-1 generates a load on a head portion 61-1, 63-1 of each of the pistons 56-1, 58-1 and causes the pistons to be preloaded against the respective stops 57-1, 59-1 in the valve member 36-1. .
- each piston 56-1, 58-1 generates a preload of approximately 50 pounds force on each respective stop 57-1, 59-1.
- the compression assemblies 46-1, 46-2 are configured to provide a transfer of load between valve member drive portions 74-1, 74-2 and the respective valve members 36-1, 36-2 in the case where each of valve members 36-1, 36-2 is translatable within its respective fluid pathway 34-1, 34-2.
- the controller 31 receives a command signal 90 from a user input device which directs the controller 31 to operate the servovalve assemblies 26-1, 26-2 in a particular manner (e.g., increase flow, decrease flow, terminate flow, etc.).
- the controller 31 also receives position signals 92-1, 92-2 from each of the displacement sensors 30-1, 30-2 thus enabling the controller 31 to determine the present position of each valve member 36-1, 36-2 within its respective fluid pathway 34-1, 34-2.
- This controller 31 compares the command signal 90 with the position signals 92-1, 92-2 and, when the controller detects a difference between the command signal 90 and the position signals 92-1, 92-2, the controller 31 transmits a control signal 94 to the motor 28.
- the rotor assembly 62 rotates relative to the stator 60. Rotation of the rotor assembly 62 causes each of the valve member drive portions 74-1, 74-2 to rotate within the respective valve members 36-1, 36-2 and generate a load on either the first pistons 56-1, 56-2 associated with the valve members 36-1, 36-2 or on the second pistons 58-1, 58-2 associated with the valve members 36-1, 36-2, depending upon the direction of rotation of the rotor assembly 62.
- valve member drive portions 74-1, 74-2 In the case where each of valve members 36-1, 36-2 is translatable within its respective fluid pathway 34-1, 34-2, the force generated by the valve member drive portions 74-1, 74-2 on either the first pistons 56-1, 56-2 associated with the valve members 36-1, 36-2 or on the second pistons 58-1, 58-2 associated with the valve members 36-1, 36-2 is less than or substantially equal to the force generated by the respective piston 56-1, 56-2, 58-1, 58- 2 on the valve member drive portions 74-1, 74-2. Accordingly, as the valve member drive portions 74-1, 74-2 rotate within the respective valve members 36-1, 36-2, such rotation causes the valve members 36-1, 36-2 to laterally translate 75 within their associated fluid pathways 34-1, 34-2. Such lateral translation modulates the flow of fluid from the pressurized fluid sources 37-1, 37-2 to the respective fluid actuators 33- 1, 33-2.
- the compression assemblies 46-1, 46-2 are configured to provide each servovalve assembly 26-1, 26-2 with a jam-override capability and allow rotation of the valve member drive portions 74-1, 74-2 within one of the valve members 36-1, 36-2 when that valve member loses the ability to translate within its respective fluid pathway 34-1, 34-2.
- the fluid pathway 34-1 includes relatively large debris particles lodged between the valve member 36-1 and its corresponding sleeve 35 such that the valve member 36-1 cannot translate longitudinally along the fluid pathway 34-1 and is effectively jammed within the sleeve 35.
- the rotor assembly 62 rotates relative to the stator 60. Rotation of the rotor assembly 62 causes each of the valve member drive portions 74-1, 74-2 to rotate within the respective valve members 36-1, 36-2 and generate a load on either the first pistons 56-1, 56-2 associated with the valve members 36-1, 36-2 or on the second pistons 58-1, 58-2 associated with the valve members 36-1, 36-2, depending upon the direction of rotation of the rotor assembly 62.
- the force generated by the valve member drive portion 74-2 on either the first piston 56-2 or on the second piston, 58-2 associated with the valve members 36-1, 36-2 is less than or substantially equal to the force generated by the pistons 56-2, 58-2 on the corresponding stops 57-2, 59-2.
- the valve member drive portion 74-1 rotates within the valve member 36-1, the valve member drive portion 74-1 generates a load on either the first piston 56-1 or on the second piston 58-1 that exceeds the preload exerted by either the first piston 56-1 or the second piston 58-1 on the corresponding stop 57-1, 59-1. Accordingly, the valve member drive portion 74-1 displaces either the first or second piston 56-1, 58-1 and allows continued rotation of the rotor 62, thereby allowing the rotor 62 to control the position of the second valve member 36-2 of the second servovalve assembly 32-2. As such, in this example, the compression assembly 46-1 allows continuous operation of the second servovalve assembly to control the fluid actuator 33 when the first valve member 36-1 becomes inoperative.
- the displacement sensors 30-1, 30-2 also provide the controller 31 with the ability to detect failure or jamming of a particular valve member 36-1, 36-2.
- the controller 31 transmits the control signal 94 to the motor 28, the controller 31 receives position signals 100-1, 100-2 from the respective displacement sensors 30-1, 30-2.
- the controller 31 compares the position signals 100-1, 100-2 to an analytical model of a valve member response to detect either translation or non-translation of a particular valve member 36-1, 36-2.
- the analytical model of the valve member response can be configured in a variety of ways
- the analytical model relates to a decrease in error between a command signal 90 and the position signals 100-1, 100-2 over time.
- the controller 31 compares the position signals 100-1 to the analytical model
- the controller 31 detects that there is a decrease in the error between the command signal 90 and the position signal 100-1 over time (i.e., the error between the command signal 90 and the position signal 100-1 goes to zero over a 50 millisecond to 100 millisecond time range). Accordingly, the controller 31 detects translation of the first valve member 36-1 within the first fluid pathway 34-1.
- the controller 31 compares the position signals 100-1 to the analytical model, assume that the controller 31 detects a substantially constant or non-decreasing error between the command signal 90 and the position signal 100-1.
- Such a non-decreasing error indicates that the actual position of the valve member 36-1 within the servovalve assembly 26-1 does not correspond to the commanded position of the valve member 36-1, as provided from the user input device.
- the controller 31 detects non-translation of the first valve member 36-1 within the first fluid pathway 34-1.
- the controller 31 is configured to adjust the pressure within the inoperative servovalve assembly to allow the pistons 56, 58 of the compression assembly 46 to move freely within the channel 50 and to minimize or eliminate the requirement that the motor 20 and the valve member drive portions 74-1, 74-2 generate enough load to overcome the preload of the compression assembly 46.
- the controller 31 detects non-translation of the first valve member 36-1, to remove the first preload generated by the compression assembly 46-1 , the controller 31 actuates a valve in the supply line from fluid source 37-1 to the first servovalve assembly 26-1 to block supply pressure and vent the hydraulic fluid from the supply input 38-1 to the return output 44-1, thus removing the hydraulic fluid pressure from the channel 50 and removing the pressure on the pistons 56-1, 58-1 of the jammed first valve member 46-1.
- the pressurized fluid contained within the first and second channel portions 51, 53 generates a load on each of the pistons 56, 58 and causes the pistons 56, 58 to generate a preload on the corresponding stops 57, 59 within valve member 36.
- springs members disposed within the channel 50 of the valve member 36 cause the pistons 56, 58 to generate a preload on the stops 57, 59 within valve member 36.
- each displacement sensor 30-1, 30-2 can be configured as an LVDT.
- each displacement sensor 30-1, 30-2 is configured as a set of multiple LVDTs.
- each displacement sensor 30-1, 30-2 includes three separate LVDTs to detect the positioning of the valve members 36-1, 36-2 within the servovalve assemblies 26-1, 26-2.
- the use of multiple LVDTs as a displacement sensor 30 provides a level of redundancy to the displacement measurements.
- the displacement sensors 30-1, 30-2 are coupled to the valve members 36-1, 36-2 and are configured to detect the positioning of the valve members 36-1, 36-2 within the servovalve assemblies 26-1, 26-2.
- a rotary sensor 30' is disposed on the direct drive servovalve motor 28.
- the rotary sensor 30' such as a Hall effect sensor can have a first sensor component disposed on the stator 60 and second component disposed on the rotor assembly 62. Motion of the first component relative to the second component causes the rotary sensor 30' to generate a signal indicative of the position of the valve members 36-1, 36-2 within the servovalve assemblies 26-1, 26-2.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010534985A JP5134690B2 (en) | 2007-11-27 | 2008-08-29 | Double redundant servo valve |
BRPI0819600 BRPI0819600A2 (en) | 2007-11-27 | 2008-08-29 | Servo valve. |
CN200880118088XA CN101878371B (en) | 2007-11-27 | 2008-08-29 | Dual redundant servovalve |
EP20080854309 EP2212564A1 (en) | 2007-11-27 | 2008-08-29 | Dual redundant servovalve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/945,668 US8210206B2 (en) | 2007-11-27 | 2007-11-27 | Dual redundant servovalve |
US11/945,668 | 2007-11-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009070358A1 true WO2009070358A1 (en) | 2009-06-04 |
Family
ID=39930488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/074759 WO2009070358A1 (en) | 2007-11-27 | 2008-08-29 | Dual redundant servovalve |
Country Status (6)
Country | Link |
---|---|
US (1) | US8210206B2 (en) |
EP (1) | EP2212564A1 (en) |
JP (1) | JP5134690B2 (en) |
CN (1) | CN101878371B (en) |
BR (1) | BRPI0819600A2 (en) |
WO (1) | WO2009070358A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012533712A (en) * | 2009-07-14 | 2012-12-27 | ウッドウォード エイチアールティー インコーポレイティド | Direct drive servo valve with redundant drive motor |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2926228C (en) * | 2013-10-03 | 2022-05-17 | Transocean Innovation Labs, Ltd. | Hydraulic devices and methods of actuating same |
DE102013017093A1 (en) * | 2013-10-15 | 2015-04-16 | Hydac Filtertechnik Gmbh | control device |
EP3406949B1 (en) | 2017-05-22 | 2022-11-16 | Claverham Limited | Spool valve |
EP3406950B1 (en) | 2017-05-25 | 2020-03-11 | Claverham Limited | Hydraulic valve |
CN108644455B (en) * | 2018-06-13 | 2023-07-21 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Pneumatic servo valve |
CN110953202B (en) * | 2019-12-04 | 2022-09-06 | 中国直升机设计研究所 | Hydraulic system redundancy conversion device and method |
US11391302B2 (en) * | 2020-03-16 | 2022-07-19 | Woodward, Inc. | Automatic air bleeding system for hydraulics |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5325669A (en) * | 1992-07-22 | 1994-07-05 | Pneumo Abex Corporation | Low breakout hydraulic power transfer unit and method of operation thereof |
WO2006006950A1 (en) * | 2003-12-23 | 2006-01-19 | Hr Textron Inc. | Redundant flow control for hydraulic actuator systems |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2826896A (en) | 1954-12-17 | 1958-03-18 | Hobson Ltd H M | Manually controlled electro-hydraulic system for aircraft |
US3338138A (en) | 1965-12-01 | 1967-08-29 | Bell Aerospace Corp | Redundant control system |
US4129145A (en) * | 1977-05-26 | 1978-12-12 | Wynn James M | Check valve assembly |
US4216795A (en) * | 1978-12-26 | 1980-08-12 | Textron, Inc. | Position feedback attachment |
US4338965A (en) * | 1980-06-02 | 1982-07-13 | Moog Inc. | Self-monitoring dual-spool servovalve |
EP0058713B1 (en) | 1980-09-02 | 1990-07-18 | Rockwell International Corporation | Actuator system for a control surface of an aircraft |
US4793377A (en) | 1986-08-18 | 1988-12-27 | E-Systems, Inc. | Direct drive servo valve |
US4987927A (en) * | 1988-12-27 | 1991-01-29 | Sterer Engineering And Manufacturing Company | Direct-drive valve |
US5035264A (en) * | 1990-09-27 | 1991-07-30 | Hr Textron Inc. | Adjustable stator retainer assembly |
US5063966A (en) | 1990-09-27 | 1991-11-12 | Hr Textron Inc. | Direct drive servovalve having bearing filter |
US5094260A (en) * | 1990-10-26 | 1992-03-10 | Alcon Surgical, Inc. | Proportional valve and pressure control system |
US5560387A (en) * | 1994-12-08 | 1996-10-01 | Caterpillar Inc. | Hydraulic flow priority system |
JP2824236B2 (en) * | 1996-03-26 | 1998-11-11 | 株式会社コミュータヘリコプタ先進技術研究所 | Direct drive type hydraulic servo valve |
GB9619488D0 (en) | 1996-09-18 | 1996-10-30 | Dowty Boulton Paul Ltd | Flight control surface actuation system |
JPH10252707A (en) * | 1997-03-17 | 1998-09-22 | Commuter Herikoputa Senshin Gijutsu Kenkyusho:Kk | Direct drive valve |
DE19948232A1 (en) * | 1999-07-10 | 2001-01-11 | Mannesmann Rexroth Ag | Directional valve disc, especially for a mobile working device |
US6439512B1 (en) | 2000-08-24 | 2002-08-27 | Hr Textron, Inc. | All-hydraulic powered horizontal stabilizer trim control surface position control system |
US6732761B2 (en) * | 2001-08-03 | 2004-05-11 | Ross Operating Valve Company | Solenoid valve for reduced energy consumption |
US7066189B2 (en) * | 2002-12-20 | 2006-06-27 | Control Components, Inc. | Predictive maintenance and initialization system for a digital servovalve |
JP4151500B2 (en) * | 2003-07-18 | 2008-09-17 | トヨタ自動車株式会社 | Hydraulic control device with opposed connection of oil flow control valve |
-
2007
- 2007-11-27 US US11/945,668 patent/US8210206B2/en active Active
-
2008
- 2008-08-29 EP EP20080854309 patent/EP2212564A1/en not_active Withdrawn
- 2008-08-29 JP JP2010534985A patent/JP5134690B2/en active Active
- 2008-08-29 CN CN200880118088XA patent/CN101878371B/en not_active Expired - Fee Related
- 2008-08-29 BR BRPI0819600 patent/BRPI0819600A2/en not_active IP Right Cessation
- 2008-08-29 WO PCT/US2008/074759 patent/WO2009070358A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5325669A (en) * | 1992-07-22 | 1994-07-05 | Pneumo Abex Corporation | Low breakout hydraulic power transfer unit and method of operation thereof |
WO2006006950A1 (en) * | 2003-12-23 | 2006-01-19 | Hr Textron Inc. | Redundant flow control for hydraulic actuator systems |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012533712A (en) * | 2009-07-14 | 2012-12-27 | ウッドウォード エイチアールティー インコーポレイティド | Direct drive servo valve with redundant drive motor |
US8925586B2 (en) | 2009-07-14 | 2015-01-06 | Woodward Hrt, Inc. | Direct drive servovalve having redundant drive motors |
Also Published As
Publication number | Publication date |
---|---|
BRPI0819600A2 (en) | 2015-05-05 |
EP2212564A1 (en) | 2010-08-04 |
JP2011504985A (en) | 2011-02-17 |
CN101878371B (en) | 2013-12-25 |
US8210206B2 (en) | 2012-07-03 |
JP5134690B2 (en) | 2013-01-30 |
CN101878371A (en) | 2010-11-03 |
US20090133767A1 (en) | 2009-05-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2212564A1 (en) | Dual redundant servovalve | |
EP2038713B1 (en) | Improvements to valve actuators | |
JP5539900B2 (en) | Spool valve actuator | |
US9933088B2 (en) | Rotary actuated valve with position indicator | |
US20070075285A1 (en) | Linear electrical drive actuator apparatus with tandem fail safe hydraulic override for steam turbine valve position control | |
EP3275789B1 (en) | Actuator assembly | |
JP5192058B2 (en) | Control system | |
CN111094822B (en) | Slide valve device and slide valve | |
US20150184773A1 (en) | Pilot valve and/or proportional valve | |
WO2017016690A2 (en) | Subsea electric actuator | |
US8096321B2 (en) | Redundant electrohydraulic valve system | |
US10836469B2 (en) | Integrated stability and control augmentation system | |
CN111971500B (en) | Lift type flow control valve | |
US8925586B2 (en) | Direct drive servovalve having redundant drive motors | |
EP3992505A1 (en) | Apparatus for controlling a valve | |
EP3587831A1 (en) | Hydraulic stage | |
CN116221222A (en) | Fluid cylinder | |
JPH0473411A (en) | Fail safe device of pneumatic actuator | |
EP0126796A1 (en) | Positioning control and locking device for a fluid powered actuator |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200880118088.X Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08854309 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010534985 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008854309 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: PI0819600 Country of ref document: BR Kind code of ref document: A2 Effective date: 20100527 |