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8066474 Variable guide vane actuator  
A variable guide vane actuator for positioning the guide vanes of a turbine engine in a hypersonic missile uses compressor exhaust to drive a linked, floating piston assembly that is coupled to the...
7963210 Spring-loaded brake cylinder having locked stop body  
A spring-loaded brake cylinder for commercial vehicles includes at least one spring-loaded brake piston that can be actuated by a pre-loaded spring and is supported in a housing. A mechanical...
7886652 Positioning control mechanism for single-acting air cylinder  
An electromagnetic operation-type automatic pressure-adjusting valve outputting an air pressure corresponding to an amount of electric power is connected in an air flow path connecting a pressure...
7739941 Hydraulic drive system and method of operating a hydraulic drive system  
A hydraulic drive system comprises a hydraulic actuator comprising a piston reciprocable between two cylinder heads for actuating a machine. A flow switching device reverses the direction of...
7520208 Drive device comprising a position controller  
A drive device comprises a fluid driven drive (2), which defines a drive space (8), in which at least one drive piston (14) is located which is able to be linearly shifted by fluid actuation and is...
7421938 Positioner for a fluid actuator  
A positioner for a fluid actuator comprising an electronics assembly designed for setpoint/actual value comparison and for outputting a feedback control signal includes a current/pressure...
7219691 Control valve positioner mounting system  
A positioner for a control valve assembly is disclosed wherein the positioner is mounted internally to thus protect the positioner from damage stemming from environmental, impact, or other outside...
6938535 Hydraulic actuator control  
A method is provided for controlling hydraulic flow to a hydraulic actuator. The method includes generating a command signal based on an operator input, sensing a linkage position associated with...
6826998 Electro Hydraulic servo valve  
An electro hydraulic servo valve assembly has a valve housing and a spool rotatably fitted to the inside of the housing. A number of ports are off-settedly provided along the length of the valve...
6789457 Gas pressure actuator capable of stably driving and controlling its slider, and method for controlling the gas pressure actuator  
A controlling and computing device performs the steps of: differentiating a slider position represented by a position detection signal fed from a position sensor, and calculating the velocity of...
6789458 System for controlling hydraulic actuator  
A system and method for controlling at least one hydraulic actuator of a hydraulic system includes a flow rate measurement of a hydraulic fluid flow traveling into and out of a cavity of the...
6786127 Fluid-actuated linear drive  
A fluid power operate linear drive possessing a slab housing (2) with an elongated cross sectional outline, in which a plurality of receiving spaces (8) are arranged extending in a common housing...
6779432 Servo circuit for use with air pressure actuator capable of improving speed control performance  
An air pressure actuator has a partition wall provided on one of a slider and a guide shaft to form two cylinder chambers between the guide shaft and the slider. Intake/exhaust systems are...
6772671 Electrohydraulic motor and hydraulic driving method  
There is provided an electrohydraulic motor that has a spool valve 110 for switching from each of drive positions (111, 112), in each of which a corresponding one of a main oil passage 230 and a...
6755115 Working cylinder  
A fluid power operated fluid power cylinder having a cylinder housing (2) on whose rear side a control system housing (33) is mounted. The control system housing (33) contains a valve means and...
6705199 Precision servo control system for a pneumatic actuator  
A precision servo control system for a pneumatic actuator has a piston positionable over a stroke of the pneumatic actuator using a supply of pressurized gas. A brake and a sensor system are...
6651544 Controlling the deadband of a fluid system  
A method for controlling a fluid system is provided. The system may include a hydraulic circuit having a pump driven by an engine, wherein the pump delivers fluid to an actuator through a valve...
6640685 Closed loop electrohydraulic actuator control circuit  
A hydraulic control system for controlling expansion and contraction of a cylinder. The cylinder comprises an extension chamber and a contraction chamber. The hydraulic control system comprises a...
6612218 Working vehicle with a working implement displaceable by a hydraulic actuator  
A working vehicle comprises a working implement (20) supported by the working vehicle to be displaceable by a hydraulic actuator (1), and a controller (16) for generating a control output signal...
6609369 System and method of pressure compensation for electro hydraulic control systems  
A pressure compensator for use in a control system for an electro hydraulic-implemented work element being operated through the use of operator input control mechanisms generating operator input...
6408737 Control method for a hydraulic drive, and a control device corresponding thereto  
A position control branch for a hydraulic drive is prescribed a desired position. The hydraulic drive is moved to an actual position via the position control branch. It is determined whether the...
6378411 Working equipment and a control system therefor  
Operating side link members corresponding to working side link members of a working device are provided in a device for operating working equipment. Rotation of the working side link members is...
6257118 Method and apparatus for controlling the actuation of a hydraulic cylinder  
An apparatus controllably moves a moveable element within a hydraulic motor. A lever device establishes an operator command signal indicative of a desired velocity and direction of movement of the...
6131500 System and method for producing motion  
This disclosure is directed to novel systems and methods for producing motion in response to a drive signal where the motion has a smooth translational reversal. The system accepts a command...
6112638 Electropneumatic positioner having binary input arrangement providing access to electrical output functions thereof  
The present invention includes an electropneumatic positioner having an external binary input block which provides access to the electrical output of an integral electronic position controller to...
6076349 Hydrostatic automotive or high speed steering system  
A full fluid-linked steering system, especially for use in on-highway steering, in which the system includes a fluid controller (21) including a fluid meter (65) operable to provide follow-up...
5960694 Hydrostatic power steering system having reduced wheel slip  
A hydrostatic power steering system comprising a fluid motor (19) which receives pressurized fluid from a controller (17) in response to the rotation of a vehicle steering wheel (W). As the motor...
5943940 Indication means in a brake cylinder for a vehicle brake  
An indication means in a brake cylinder for a vehicle brake with a spring activated parking brake in which the brake cylinder comprises a cylinder housing (3) with a casing wall (22) and at least...
5934169 Double-acting electropneumatic positioner  
A double-acting electropneumatic positioner for controlling an actuator, the actuator having a first and second chamber, comprises a single-acting electropneumatic positioner which provides an...
5931180 Electropneumatic positioner  
An electropneumatic positioner includes a data processing control section and an electropneumatic converter. The control section includes first and second position determining sections and a signal...
5924516 Electronic controls on a skid steer loader  
A control system controls actuation of a hydraulic cylinder on a skid steer loader. The control system includes a movable element, movable by an operator. A position sensor is coupled to the...
5918527 Locus control system for construction machines  
A locus control system of hydraulic excavators whereby a target locus for a front device is set beforehand. A control unit calculates a position and posture of the front device based on signals...
5884894 Inner-loop valve spool positioning control apparatus  
A valve control system for positioning a valve in response to a command signal. The valve control system comprises a sensor for detecting the position of the valve and for generating an outer...
5829335 Control for hydraulic drive or actuator  
A control for a hydraulic drive or actuator is provided, wherein the actuator has pressurized operating fluid applied thereto, and wherein the operating fluid is directed through an electrically...
5823218 Large manipulator, especially for self-propelled concrete pumps, and method for operating it  
A large manipulator, especially for self-propelled concrete pumps includes a rotary head that rotates about a vertical axis on a mast stand, and a jointed or articulated mast composed of at least...
5634334 Hydraulic device for use in a production machine  
In a hydraulic device at least one control valve with at least three control positions is connected with a variable capacity pump, whereby the controlling device of the variable capacity pump is...
5615593 Method and apparatus for controllably positioning a hydraulic actuator  
A system and method for controllably positioning a hydraulic actuator which is operably connected to a control surface includes at least one main control valve for controlling the hydraulic...
5586435 Hydraulic closed loop control system  
A closed loop hydraulic system especially adapted as a shot control system for a die casting machine. The control system includes a voice coil driven pilot servo valve mounted to a high flow...
5570621 Adaptive control for hydraulic systems  
An automotive hydraulic control system varies hydraulic fluid pressure applied to an actuator to position the actuator in accord with an automotive control application, the fluid pressure being...
5379678 Hydraulic drive  
A hydraulic drive in accordance with the invention includes an axial piston hydraulic motor provided for forming a power drive with a follow-up control valve provided for controlling the pressure...
5121042 Electro-hydraulic servo mechanism  
An electro-hydraulic servo mechanism comprising: a hydraulic actuator formed with a pair of hydraulic chambers and having an output member which is displaced by a differential pressure between the...
RE33846 Electrohydraulic valve system  
A control system for controlling a double-acting cylinder includes four pilot-operated, proportional-type poppet valves for controlling fluid flow between the cylinder, a pump and a reservoir. Four...
5092409 Coupling and lifting system for an implement, in particular an agricultural implement, that can be mounted on the front of a tractor  
A system includes two lower articulated longitudinal arms (6, 7) provided on their front ends with two bottom hitching points (8, 9), and an upper arm (10) in the middle, for hitching an implement...
5076327 Electro-fluid converter for controlling a fluid-operated adjusting member  
An electro-fluid converter for controlling a fluid actuating an adjusting element, such as a main control slider of a servo valve, comprises at least one displaceable throttle arranged in a...
5031506 Device for controlling the position of a hydraulic feed drive, such as a hydraulic press or punch press  
The position (x) of a hydraulic press or punch press is controlled highly dynamically, by a controller which uses the velocity (v) and the acceleration (aB) of a piston. While the position (x) and...
5018431 Apparatus for positioning a work implement  
An apparatus for positioning a work implement in predetermined operative attitudes, including a valve body mounting a piston which is operable for movement through a range of selective operative...
4986074 Hydraulic cylinder control system for garbage collection truck lift-dump handler  
An article handling apparatus is disclosed which comprises two independently controllable fluid actuated drives. The first fluid actuated drive comprises a cylinder and a differential piston which...
4947732 Electro-hydraulic servo actuator with function for adjusting rigidity  
An electro-hydraulic servo actuator with function for adjusting rigidity. The electro-hydraulic servo actuator comprises an electro-hydraulic transducer which transduces an electric signal into a...
4924754 Circuit arrangement for a hydraulic drive in a position control circuit  
For path control of a plurality of drives, i.e. for driving a plurality of drives in different axes in geometrical path dependence, to obtain high accuracy it is necessary for the lag error of the...
4901624 Hydraulic driving device  
A hydraulic driving device includes a working cylinder for moving a machine component, and an electro-hydraulic servo system. The servo system includes a servo-valve, a position-error control, a...
Matches 1 - 50 out of 232 1 2 3 4 5 >