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7496441 |
Features of main control for a power machine
The present invention is directed to a computer based control system for controlling hydraulic and electromechanical actuators on a power machine, such as a skid steer loader. The computer based...
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7451685 |
Hydraulic control system with cross function regeneration
A system operates a hydraulic actuator, such as a cylinder, in one of several modes that include powered extension and retraction, self-powering regeneration modes in which fluid exhausting from...
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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...
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7406910 |
Device and method for controlling the position of a pneumatic actuator
The invention pertains to a device for the controlling the position of a pneumatic actuator comprising:
a pneumatically adjustable actuating element ( 5 ); a pneumatic actuating drive ( 6 )...
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7387061 |
Control apparatus for hydraulic cylinder
Cushion chambers ( 8 ) disposed in the vicinity of both ends of a hydraulic cylinder ( 1 ) to throttle inflow or outflow of an operating oil caused by a piston ( 5 ) moving close to a piston stroke...
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7380398 |
Hydraulic metering mode transitioning technique for a velocity based control system
The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time for energy conservation. The metering mode to use is...
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7351288 |
Shock absorbing fluidic actuator
According to one aspect of the invention, a fluidic actuator and a control system for the fluidic actuator may be provided. A first component of the actuator may have two openings interconnected by...
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7320216 |
Hydraulic system having pressure compensated bypass
The present disclosure is directed to a hydraulic system. The system includes a first source of pressurized fluid and at least one fluid actuator. The system also includes a first valve disposed...
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7296404 |
Apparatus for controlling deceleration of hydraulically powered equipment
A machine member driven by a hydraulic actuator may oscillate, or wag, when the hydraulic actuator decelerates or stops. The degree of oscillation is a function of the machine member's ability to...
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7228783 |
Pressure control system for a torque-transmitting mechanism
The present invention provides a pressure control system having a control solenoid with plurality of coils disposed therein, and operable to provide a plurality of pressure gain characteristics to...
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7210394 |
Method and apparatus for controlling air cylinder
A method for controlling an air cylinder such that air is supplied to and exhausted from pressure chambers of the air cylinder by air servo valves. Pressures in the pressure chambers are detected...
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7207177 |
Position control device for an electrical-fluid power drive and a method of positioning
A method and a position control device for an electrical-fluid power drive comprising a fluid power and an electrical actuator for driving a force output point. The invention contemplates the...
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7178448 |
Air servo cylinder apparatus and controlling method therefor
A method for controlling an air servo cylinder apparatus includes an advancing process of advancing a piston up to a target position by controlling, by a controller, servo valves individually...
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7143682 |
Large manipulator having a vibration damping capacity
A large-size manipulator comprises a boom made up of several segments and arranged on a vehicle frame. The boom is foldable and has a slewing track ring rotated about a vertical axis of rotation....
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7142967 |
Features of main control computer for a power machine
The present invention is directed to a computer based control system for controlling hydraulic and electromechanical actuators on a power machine, such as a skid steer loader. The computer based...
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7017469 |
Metering device
A metering device of the type in which a shuttle moves axially within a chamber between two terminal positions, with the chamber having fluid inlet and outlet at each end so that fluid may enter...
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6951102 |
Velocity based method for controlling a hydraulic system
A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid...
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6951067 |
Method and apparatus for controlling positioning of an implement of a work machine
An apparatus for controllably positioning a work implement of an earth moving machine is disclosed. The work implement includes a boom and an attachment being attached thereto where the boom is...
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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...
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6883532 |
Large-scale manipulator comprising a vibration damper
The invention relates to a large-scale manipulator, especially of concrete pumps. Said large-scale manipulator has a bending boom ( 22 ) which consists of at least three boom arms ( 23 to 27 )...
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6880332 |
Method of selecting a hydraulic metering mode for a function of a velocity based control system
The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time. The metering mode to use in selected in response to...
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6799501 |
High speed driving method and apparatus of pressure cylinder
A pressure cylinder is connected to an air pressure source through a servo valve, the servo valve is controlled as an on/off switching valve by a control section in an advancing working step of a...
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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...
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6732629 |
Pneumatic actuator circuit
Disclosed is a piston positioning system for positioning a piston within a cylinder of a pneumatic circuit. The system comprises a piston position indicator for sensing an actual piston position, a...
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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...
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6634172 |
Thermal contraction control apparatus for hydraulic cylinders
A method and apparatus for operating a load lifting device to move a load and hold the load steady is disclosed. In the conventional arts, a lifted or lowered suspended load had a tendency to move...
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6629020 |
Control device for the position of a valve slide
A control device for the position (x) of a valve slide ( 3 ), with a d.c. voltage (U B ) operated set point transmitter ( 11 ), which produces a set point value (U w ) proportional to the position...
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6570267 |
Antitheft device for construction machinery
In the construction machinery equipped with an engine, a hydraulic control unit and a machine controller, there is provided an antitheft device for the construction machinery, which can prevent the...
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6546325 |
Device for controlling a working arm of a working machine
A device for controlling a working arm of a working machine, which is capable of releasing the pressure of the actuation fluid confined in the actuation cylinder of the working arm device at a...
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6540010 |
Device for hydraulically adjusting the rollers of strand guiding segments of a continuous casting installation
A device for hydraulic adjustment of rollers of strand guiding segments of a strand casting device has hydraulic cylinders which are separated by a piston with piston rod into a cylinder chamber...
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6536326 |
Control system and method for preventing destructive collisions in free piston machines
In a free piston machine, initial collisions of the piston with structures at the end of the cylinder are detected and generate a change in the magnitude of a perturbation signal, which is applied...
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6512960 |
Positioner and method for operating the positioner
The invention relates to a method for operating a positioner with a first input for an input variable W for prescribing a desired value, a second input for a controlled variable X, an output for a...
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6405632 |
Protection device for controlling the motion of a pneumatic actuator
A protection device for controlling the motion of a pneumatic actuator, having at least one elongated cylinder provided with a piston, dividing the cylinder into a first chamber and a second...
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6401456 |
Method and device for controlling work machine
An electro-hydraulic transducing valve ( 3 a ) and other elements associated with cylinder-controlling components, such as a control valve ( 3 ), are connected to the output end of a controller (...
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6360142 |
Random work arranging device
A random work arranging device that arranges randomly conveyed works by using a robot and carries out the arranged works, wherein the robot comprises a plurality of arms and a single robot...
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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...
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6234060 |
Controllable pneumatic apparatus including a rotary-acting brake with field responsive medium and control method therefor
A controllable pneumatic actuator and motion control apparatus including a field responsive medium and control method therefor. The apparatus has a pneumatic actuator coupled to a rotary-acting...
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6230606 |
Speed control apparatus for cylinder
A speed control apparatus for a cylinder comprises the cylinder, speed controllers for controlling flow rates of a pressure fluid introduced into and discharged from cylinder chambers, a controller...
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6227481 |
Method and apparatus for controlling force fights in a rotating shaft
An improved tilting rotor aircraft, a control system for an elongated shaft, and a method of controlling an elongated shaft are provided. Sensors are utilized to detect an amount of twist on a...
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6216794 |
Joystick control for an automatic depth control system and method
An automatic depth control system is disclosed. The system includes a Console and remote Controller mounted in the tractor cab, power beyond Valving, and Depth Sensors, either ground contact or...
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6199381 |
DC centering of free piston machine
In a free piston machine, a coil is mounted to its housing and magnetically linked to a permanent magnet or electromagnet on its piston member to form a linear motor. The coil and magnet are either...
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6185493 |
Method and apparatus for controlling an implement of a work machine
An apparatus for controllably moving a work implement of an earth moving machine is disclosed. The work implement includes a boom and a bucket being attached thereto where the boom is actuated by a...
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6142059 |
Method and apparatus for sensing the orientation of a mechanical actuator
A system for determining the extended length or orientation of a hydraulic actuator, or of an implement or joint, is disclosed herein. Electromagnetic (EM) bursts such as ultra-wideband or...
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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...
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6092973 |
Dial-in ejector speed control for articulated trucks and the like having ejector type dump mechanism
A material eject system includes an ejector mounted to a bed of a vehicle which is movable between a rear end and a forward end of the bed for ejecting material from the bed. The ejector is powered...
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6085846 |
Potentiometer-based gauge wheel device positioning system and method
A potentiometer-based gauge wheel position sensor system for use as part of an automatic depth control system. The potentiometer-based gauge wheel position sensor system works with a Console and...
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6085632 |
Apparatus for the damped positioning of a piston
An apparatus for the damped positioning of a piston running in a cylinder at one fixed abutment at least and more particularly for setting in a terminal position. The apparatus includes sensor...
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6005360 |
Power unit for the supply of hydraulic actuators
The invention discloses a power unit (1) which comprises: an accumulator battery (2); an electric converter (3) supplied by said accumulator battery (2); an electric motor (30) supplied by said...
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6003811 |
Aircraft servovalve current rate limiter
Aircraft flight path changes commanded by a pilot via the wheel, column and pedal (12) are converted to position sensor signals (14) and passed as the input to primary flight computer (26). The...
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5996464 |
Fail safe valve and multiplexed fluid control systems incorporating the same
A fail-safe second stage valve for controlling actuator movement upon power loss in a multiplexed fluid power control system. The second stage valve is interposed between a corresponding actuator...
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