Device and method for suppressing vibration of a working machine

• US 5,832,730 A
• Filed: 10/08/1996
• Issued: 11/10/1998
• Est. Priority Date: 02/21/1994
• Status: Expired due to Fees

• Current Assignee: Komatsu Ltd.
• Original Assignee: Komatsu Ltd.
• Inventors: Mizui, Seiichi
• Primary Examiner(s): LOPEZ, FRANK D
• Application Number:
  US08/696,828
• Time in Patent Office: 763 Days
• Field of Search: 60/469, 91/361, 91/363 R, 91/420, 91/433
• US Class Current: 60/469
• CPC Class Codes: B66C 13/066 for minimising vibration of a boom
• CPC Class Codes: B66C 13/18 Control systems or devices exclusively for rope, cable, or chain winding mechanisms B66D1/40
• CPC Class Codes: E02F 9/2207 for reducing or compensating oscillations
• CPC Class Codes: G05D 19/02 characterised by the use of electric means

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).

Claims

1. 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.

2. A device for suppressing vibration of a working machine according to claim 1, wherein said acceleration compensating value is a value resulting from the multiplication of said acting force by said lever turning degree coefficient.

3. A method for suppressing vibration of a working machine with a lever, comprising the steps of:

detecting a value of at least an acceleration of said working machine driven by an oil hydraulic actuator; and

driving and controlling said oil hydraulic actuator by a feedback command value based on said lever operation command value from which an acceleration compensating value is subtracted,

wherein said acceleration compensating value is based on said detected value and a lever turning degree coefficient corresponding to a lever operation, 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. A device for suppressing vibration of a working machine having an oil hydraulic actuator for driving the working machine, 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.