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JPWO2004007973A1 |
It is an object of the present invention to provide an electro-fluid pressure actuation system capable of preventing a shortage of the amount of fluid supplied to the fluid pressure actuator of a plurality of electro-fluid pressure actua...
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JP3713877B2 |
To provide a speed control device for a tilt cylinder formed so as to reduce a shock in a stroke end by automatically decelerating a speed of the tilt cylinder when it comes adjacent to the stroke end, when a mast is tilt operated. Betwe...
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JP3701511B2 |
To relax a trangent in switching to a mechanical back up mode and to ensure a predetermined actuator speed in the mechanical back up mode. A restriction means 40 which can restrict a switching speed of a directional control valve 33 is p...
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JP3688205B2 |
To provide a working vehicle capable of performing a lifting control with less shock even when a target height is changed while a working device is lifted to the target height in position control. A control is started with a start flow Q...
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JP3683446B2 |
To provide a small electrohydraulic servo motor. An electrohydraulic servo motor 100 to rotate an output shaft 61 in accordance with a difference of revolution of an axis of ro rotation 41 and the output shaft 61 is furnished with displa...
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JP3675585B2 |
To provide a control system of a hydraulic actuator which is capable of suppressing, e.g. behaviors of the prescribed state variables of the control system such as spool displacement of a servo valve and hydraulic cylinder differential p...
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JP3664780B2 |
To smoothly decrease the speed of an actuator so as to stop by providing an electric pressure reducing valve, a pressure detector, a deceleration computing part and an output correcting means between at least one of pilot operating devic...
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JP3653387B2 |
To easily find the controller having high responsiveness by suppressing the increase of evaluating signals to be used for an evaluation expression. Concerning a control system for actuator composed of an actuator, actuator driving part a...
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JP3640414B2 |
PURPOSE: To provide a stable fluid pressure system by operating an input signal to a control value by a compensating means to which a primary and/or multilag modules are cascaded to a gain, and adding the operated signal to the output si...
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JP3640823B2 |
To provide a directly driving type electro-hydraulic servo valve with high controllability and also a servo controlling system which is excellent in controllability, has high reliability and is inexpensive. This system is provided with a...
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JP3635982B2 |
To increase current distribution for an electric-pneumatic conversion module by providing a variable impedance circuit having low impedance in a DC area and having high impedance in a digital communication frequency band, the electric-pn...
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JP3632004B2 |
To provide a ball screw device allowing a plurality of ball nuts to equally share load applied thereto without changing the mounting positions of the ball nuts to an acting body. In this linear moving ball screw device for moving the act...
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JP3626220B2 |
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JP3626234B2 |
A cylinder positioning control apparatus designed to effect positioning of a cylinder by learning control that uses not only an overrun distance but also a cylinder speed as input data for control. The apparatus has a device for taking i...
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JP3613315B2 |
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JP2005009665A |
To realize constant supplying of a discharge oil quantity of a hydraulic pump supplied to an actuator for driving a working device of a construction full equipment regardless of a load pressure of the actuator even at a low speed rotatio...
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JP3596293B2 |
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JP2004301188A |
To provide a hydraulic control system which can smoothly and timely carry out transition from speed control to position control.The hydraulic control system comprises an actuator 10, a pump 20, an electric motor 30, a servo controller 70...
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JP2004268648A |
To provide a body lifting speed control device for a dump truck capable of relieving an impact during the switching operation of a cylinder even when the cylinder which is of two-stage stroke type is used as a hydraulic cylinder.Speed co...
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JP2004268649A |
To provide a body lifting speed control device for a dump truck capable of making a body lifting speed uniform at the time of switching a cylinder even when the cylinder which is of two-stage stroke type is used as a hydraulic cylinder.S...
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JP2004270923A |
To provide a technique related to a hydraulic system, and in particular to a method for controlling a hydraulic system.An actuator 16 is part of a hydraulic circuit branch that has a first electrohydraulic proportional valve 21 connectin...
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JP2004263645A |
To provide a hydraulic device allowing stable pushing.The hydraulic device has a hydraulic pump 1 that is driven by an electric motor 6 and is rotatable in both directions, and both ports 14 and 16 of a hydraulic cylinder 12 are connecte...
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JP2004251331A |
To provide a fluid control method for improving the control accuracy when controlling a driving device by using fluid.The hydraulic pressure to be supplied to a hydraulic cylinder 1 is controlled by a plurality of solenoid control valves...
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JP3563365B2 |
To provide an actuator enabling to lessen the capacity of the full output of an electric motor and to reduce the weight and dimensions of the electric motor, compared with a conventional one. In the actuator comprising a hydraulic cylind...
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JP3560564B2 |
To provide a servo actuator control device capable of continuously disconnect a servo control valve 39 in abnormal condition with the switching operation obstructed from a control system certainly and allowing the servo control valve 39 ...
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JP3558388B2 |
PURPOSE: To effectively utilize the stroke in a single rod cylinder by selecting a condition feedback vector, stored in a memory means in accordance with the elasticity direction of a single rod cylinder, to operate control input from th...
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JP3556098B2 |
To provide a controller capable of starting up a hydraulic actuator with little generation of impact, allowing the actuator to rapidly reach a control target position, and then stopping it with little generation of impact. An actuator is...
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JP3554899B2 |
A method and apparatus for controlling a two-stage valve (10) using a closed-loop control system, the system including a variable gain element (54), the method involving continually performing the steps of estimating the flow gain of the...
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JP3554448B2 |
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JP2004211669A |
To provide a servo valve control device having a servo valve control device capable of performing normal control without occurrence of a valve opening control deviation even when disturbance occurs at the input end of the servo valve.The...
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JP3544868B2 |
To stably control an extrusion rate with high accuracy by determining a control gain in a control system for adjusting a delivery of a hydraulic pump based on a mathematical model expression, using the mathematical model expression repre...
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JP3545111B2 |
To obtain sufficient holding force (braking force) at the time when a command means indicates neutral in a constant pressure controlled liquid hydraulic driven device. A first cam 27 shifts a directional control valve 20 to neutral at th...
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JP2004521283A |
A method and apparatus for controlling a valve/actuator plant by generating a plurality of independent correcting control signals each responsive to a plurality of respective input signals and at least one of these input signals being th...
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JP2004169914A |
To provide a hydraulic drive cook system that can be endured for the usage even under the severe environment of pitching and rolling like a boat.A hydraulic actuator that operates at least one cook and a operation gear of the hydraulic a...
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JP2004160529A |
To provide a double acting hydraulic press with which the operation of a plurality of cylinders reduces the consumption of an operating oil by controlling both uses of rotation control of a hydraulic pump and a control servo-valve in a p...
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JP3532396B2 |
To lessen a packing volume for a positioner, and facilitate the replacement work for a feedback lever, and improve the durability of a spring by making a fixed pressing force always act on a connecting pin provided in the working shaft o...
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JP2004150400A |
To continuously operate an apparatus for an engine and to improve reliability.This device is provided with a positive pressure diaphragm actuator 21 having a tip of a piston rod 21a connected to the apparatuses 12 and 13 for the engine, ...
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JP3530662B2 |
To control the raising and lowering of a work device with rapidity and without developing overshoot. This controller is equipped with a hydraulic cylinder 2 by which a plow connected to a travelling car body is drivingly lifted and lower...
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JP3529973B2 |
To provide a control device for a pressure-response operation type actuator to realize high speed responsiveness without damaging durability of an object to be driven. A control device for a pressure-response operation type actuator is p...
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JP2004132416A |
To improve the responsiveness of a rod, and to highly accurately set a load to be applied to the rod.An operation rod 12 having a sucking bit 19 on the tip is arranged in a piston able to freely reciprocate in an actuator body 11. A pres...
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JP3523586B2 |
To smoothly give vibration into soil during propelling of a vibration generating device by preventing a piston from being retreated to stroke end of the rear or being protruded to the stroke end of the front by a magnitude of static prop...
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JP3521784B2 |
To clamp one of members to be butted against each other while automatically centering the same with respect to the other of the member without changing a clamp force with the use of a simple structure. A pair of cylinders 4, 5 are oppose...
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JP3511458B2 |
To reduce work load and eliminate mistake in setting up in a work site and periodic maintenance. An automatic setting command is given to an electropneumatic positoner. Thereby, in the electropneumatic positoner, in the case of convertin...
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JP3509264B2 |
PURPOSE: To eliminate defects related to play, friction, rattling noise, etc., and eliminate the machining process of an input shaft, embrittlement of materials related thereto, and ball component groups by arranging an element having on...
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JP2004068663A |
To provide a pressure generating device for reducing the changing frequency of a seal.The pressure generating device increases hydraulic pressure in a hydraulic pressure chamber 4 in a cylinder 1 with a rod 2 slid and pushed into the cyl...
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JP3494858B2 |
To hardly disconnect oil passages even in a pilot shaft of small diameter and to provide sufficient control responsiveness by providing at least two pairs of oil passages for driving a piston in the same direction on the piston and the p...
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JP3490561B2 |
To prevent a peak from appearing in a control input at the time of step response and to stabilize control even when the peculiar vibration number of control system is fluctuated by constituting a hydraulic cylinder stroke servo system by...
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JP3481277B2 |
PURPOSE: To improve the accuracy of speed control for a hydraulic actuator, reduce shock at braking time, lower the lowest value of driving force, and simplify the structure of a device. CONSTITUTION: Discharge ports of two variable disp...
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JP3473724B2 |
To enable any leakage from a regulating valve to the detected by outputting a diagnostic signal for increasing/decreasing an air pressure by means of a start signal, computing a quickness difference in variation between a reference signa...
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JP3474353B2 |
To provide an operation device for a transmission where a shock just after the synchronous completion of a speed change motion is reduced, and a shift feeling is improved. A reaction piston 19b to give reaction for giving operation feeli...
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