US 5,832,730 AGranted

Device and method for suppressing vibration of a working machine

AssigneeKomatsu Ltd.

InventorSeiichi Mizui

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Abstract

A device and method for suppressing vibration of a working machine in which residual vibration produced immediately after an operation is completed can be suppressed well without degrading the response. The device comprises a working machine acceleration detecting means (11H, 11B), a lever turning degree coefficient calculating means (17) for calculating coefficient in accordance with a lever turning degree, an acceleration compensating value operating means (13) for performing an operation from the acting force calculated from the acceleration of the working machine and a lever turning degree coefficient, and a feedback command means (18) for calculating an acceleration feedback command value from an acceleration compensating value and a lever operation command value and for outputting the acceleration feedback command value to electromagnetic proportional pressure control valves (22, 23).

Claims4

Dependent claims

A device for suppressing vibration of a working machine having an oil hydraulic actuator for driving the working machine with a lever, an oil hydraulic pump for supplying hydraulic oil to said oil hydraulic actuator, a directional control valve provided between said oil hydraulic pump and said oil hydraulic actuator, and electromagnetic proportional pressure control valves for switching and controlling said directional control valve for suppressing vibration of a working machine in which vibration is controlled by outputting feedback command value based on the acceleration of said working machine to said electromagnetic proportional pressure control valves, said device comprising:

a working machine acceleration detecting means for detecting the acceleration of said working machine driven by said oil hydraulic actuator;
a lever turning degree coefficient calculating means for calculating a coefficient corresponding to the lever turning degree from a lever operation command value by an operator;
an acceleration compensating value operating means for generating an acceleration compensating value from an acting force calculated from said working machine acceleration and said lever turning degree coefficient;
and
a feedback command means for obtaining an acceleration feedback command value from said acceleration compensating value and said lever operation command value and for outputting said acceleration feedback command value to said electromagnetic proportional pressure control valve,
wherein said acceleration feedback command value is a value of said lever operation command value from which said acceleration compensating value is subtracted, and
wherein said lever turning degree coefficient is a coefficient which reaches maximum value at said lever operation command value with the lever in a neutral position.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/696,828Filed 8 Oct 1996
Priority: JP 6-04633021 Feb 1994
Granted: 10 Nov 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B66C 13/066
For minimising or preventing longitudinal or transverse swinging of loads: for minimising vibration of a boom
B66C 13/18
Other constructional features or details: control systems or devices
E02F 9/2207
Arrangements for controlling the attitude of actuators, e.g. speed, floating function: for reducing or compensating oscillations
G05D 19/02
Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase: characterised by the use of electric means