Shock prevention apparatus for hydraulic/air-pressure equipment and method thereof
AssigneeSamsung Heavy Industry Co., Ltd.
InventorMyung-Hoon Song
Life of this patent
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Abstract
Disclosed is a shock prevention apparatus and method for hydraulic construction equipment such as excavators, loaders, dozers and cranes, which use hydraulic cylinders and motors as actuators. The shock prevention apparatus of the present invention low pass filters an original actuator driving command signal of the rectangular wave in accordance with displacement data of the piston stroke in the actuator, to generate a smooth actuator driving command signal, so that the shocks due to rapid opening and closing of the oil passages of the hydraulic actuator and the shocks at the stroke ends of the piston of the hydraulic actuator are prevented.
Claims7
A shock prevention apparatus for equipment having at least one hydraulic/air pressure actuator performing mechanical work by hydraulic/air pressure and at least one valve for controlling the flow of oil/air to said actuator, comprising:
- at least one input means for generating an original actuator driving command signal;
- and
- controller means for receiving said original actuator driving command signal and data associated with the displacement of a piston of said actuator and said controller means generating a low-pass-filtered actuator driving command signal from said original actuator driving command signal and said data associated with the piston displacement of said actuator to control said valve by means of the low-pass-filtered actuator driving command signal.
A shock prevention method for preventing shocks of a hydraulic/air pressure actuator using a controller comprising the steps of:
- (a) providing said controller with displacement data of the piston stroke of said hydraulic/air pressure actuator;
- (b) providing said controller with an original actuator driving command signal;
- (c) generating a low-pass-filtered actuating driving command signal in accordance with said displacement data and said original actuator driving command signal;
- (d) applying said low-pass-filtered actuating driving command signal to said hydraulic/air pressure actuator to actuate same;
- and
- (e) returning to step (a).
Dependencies are inferred from the claim text.