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JP5843558B2 |
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JP5820398B2 |
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JP5812826B2 |
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JP5802104B2 |
A variable impedance circuit is provided as an active load between an input line L1 and an output line L2. This circuit has low impedance with respect to a DC electric current signal and has high impedance with respect to an AC electric ...
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JP5788338B2 |
Method and apparatus for performing diagnostics in a pneumatic control loop for a control valve. Pressure and displacement (68, 84) sensors normally provided with a positioner (14) are used to detect operating parameters of the control l...
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JP5781900B2 |
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JP5781914B2 |
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JP5733540B2 |
A pump control assembly includes a fluid pump assembly having a fluid pump and a load sensing valve. The fluid pump includes a fluid inlet and a fluid outlet. The fluid pump includes a variable displacement mechanism. The load sensing va...
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JP5706213B2 |
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JP2015040569A |
To provide a valve positioner capable of obtaining sufficient response even when a characteristic of a valve varies.A valve positioner having an auto-tuning function 7 for determining a control parameter of a valve 5 comprises: parameter...
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JP5628196B2 |
Apparatus to control a fluid flow are disclosed. An example fluid flow control apparatus described herein includes a signal stage comprising a signal stage relay having a supply plug being operatively connected to a valve seat at a first...
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JP5599504B2 |
A hydraulic fan drive includes a hydraulic pump that has an adjustable swept volume. The hydraulic pump is assigned a pressure control valve arrangement that is configured to regulate a pump pressure by adjustment of the swept volume. Th...
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JP5595987B2 |
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JP5577286B2 |
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JP5548158B2 |
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JP5538096B2 |
A method of controlling a hydraulic system, the hydraulic system including a ram cylinder unit having a cylinder and a ram, and a hydraulic pump and a reservoir used to supply hydraulic fluid to the cylinder, and hydraulically driving th...
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JP5522414B2 |
A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A p...
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JP5504871B2 |
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JP5493953B2 |
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JP5462753B2 |
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JP5453356B2 |
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JP5438558B2 |
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JP5438559B2 |
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JP5438560B2 |
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JP5386902B2 |
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JP5382572B2 |
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JP5367071B2 |
A fluid pressure operated actuator device, comprising: a body defining a first chamber (2) comprising an inlet in fluid communication with a pressurized fluid source (1); and a moveable element (5) mounted in the first chamber, the movea...
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JP5339947B2 |
Method and apparatus for performing diagnostics in a pneumatic control loop for a control valve. Pressure and displacement (68, 84) sensors normally provided with a positioner (14) are used to detect operating parameters of the control l...
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JP5336434B2 |
An inner pressure of an actuator is measured by a pressure measuring unit, and an amount of displacement of a movable mechanism is measured so that a position error compensation unit to which a desired value for the displacement and the ...
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JP5327544B2 |
A method for estimating actuator position includes the steps of receiving fluid pressure data signals from a plurality of fluid pressure sensors (31), receiving spool position signals from at least one spool position sensor (33), and rec...
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JP5319759B2 |
The invention relates to a method for determining the dead zone of a proportional control valve (8) used for controlling an actuator of a rock drilling device, the method comprising controlling the control valve (8) with an electric P co...
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JP5284539B2 |
A digital hydraulic controller has at least two rows of valve elements: one can connect a supply line to a controller output, the other can connect the controller output to an outlet line. The valve elements of each row are connected in ...
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JP5286365B2 |
An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston that can be moved therein along the working...
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JP5268357B2 |
The present invention discloses a method of detecting faults in a control loop for a control valve (10) having a throttling element coupled to a pneumatically operated actuator (12), the control loop including a pneumatic amplifier (26) ...
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JP5218204B2 |
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JP2013125380A |
To achieve simple and highly responsive motion control of a fluid pressure controlled actuator.A difference between a target position and a current position of a piston 13 is acquired to obtain proportionally controlled pressure that is ...
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JP5183202B2 |
Methods and apparatus related to feedback control for electro-pneumatic control systems are disclosed. An example electro-pneumatic control system comprises an electro-pneumatic controller and a secondary pneumatic power stage coupled to...
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JP5154806B2 |
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JP5105845B2 |
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JP5095458B2 |
A hydraulic servo drive device includes: a pilot spool (20) for switching supply and shutoff of oil; a servo piston (11) slid in accordance with the pilot spool (20); a stroke sensor (15) for detecting a displacement of the servo piston ...
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JP2012233557A |
To enable vibration isolation control and inclination control of a surface plate while utilizing characteristics of an automatic leveling valve in a two-layer three-way valve for a vibration isolation system.A surface plate vibration iso...
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JP2012233584A |
To provide a proportional actuator valve that can properly maintain and adjust a position of an actuator.The proportional actuator valve includes: a valve housing having at least two chambers 324, 325; a valve slider 113 movable in the h...
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JP5074640B2 |
There is provided an abnormality determination unit that determines whether or not an output measurement unit is abnormal, in order to determine abnormality of the output measurement unit. When the output measurement unit is abnormal, th...
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JP5055563B2 |
A fluid-operated regulating apparatus for use in a motor vehicle, particularly to control the operation of a consumer, such as a clutch which transmits torque between an engine and a transmission in the power train of a vehicle as a func...
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JP4963446B2 |
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JP4959284B2 |
To improve responsiveness, and to accurately control a position. A spool 24 is slidably moved in a sleeve 23 arranged in a valve body 22. An inner peripheral groove 25 having a supply port 25a to which compressed air is supplied, an inne...
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JP4934077B2 |
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JP4900625B2 |
To enhance an operating efficiency by dispensing with a complicated operation wherein an engine is once stopped and started again at the time of switching forward and reverse rotation of a cooling fan. A forward rotation position A for r...
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JP4890845B2 |
An actuator includes a cylinder, a piston that is disposed in the cylinder and moves by supply and exhaust of working oil to and from the cylinder, a movable rod that is connected to the piston, a screw shaft, at least a part of which is...
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JP2011240838A |
To easily adjust an aboveground height of a vehicle body and a wheel load of a drive wheel.The forklift includes a drive cylinder 11 for vertically rocking the drive wheel 10, a caster cylinder 21 for vertically rocking an auxiliary whee...
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