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WORK MACHINE

  • US 20200131737A1
  • Filed: 04/23/2018
  • Published: 04/30/2020
  • Est. Priority Date: 09/15/2017
  • Status: Active Grant
First Claim
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1. A work machine comprising:

  • a machine body;

    a front work implement mounted to a front portion of the machine body in a vertically rotatable manner;

    at least one cylinder configured to drive the front work implement;

    an operation input device configured to instruct an operation of the cylinder; and

    a drive control system configured to control driving of the cylinder in accordance with an instruction from the operation input device,the drive control system configured to decelerate the cylinder by correcting an operation velocity instructed by the operation input device to or below a preset allowable velocity when the cylinder approaches a stroke end,wherein the drive control system includesa stroke end distance calculation and evaluation section configured to determine whether or not it is possible for the cylinder to collide with the stroke end,a dynamic center of gravity position prediction section configured to predict a trajectory of the dynamic center of gravity position of the work machine from a time when a deceleration operation of the cylinder starts to a time when the cylinder stops, when it is determined by the stroke end distance calculation and evaluation section that it is possible for the cylinder to collide with the stroke end, andan allowable velocity changing section configured to change the allowable velocity in accordance with a minimum distance from the trajectory of the dynamic center of gravity position predicted by the dynamic center of gravity position prediction section to a tipping line of the work machine.

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