Patent ID: 8509999
Filing Date: 2013-08-13
Classification: E02F

Abstract:
1. An abnormal operation detection device of a machine provided with an operation mechanism for excavating, comprising: an operation measuring device that measures a hydraulic operation pressure transmitting plural kinds of operation commands of an operator to said operation mechanism; an integrated amount calculating device that calculates an integrated value in time direction with regard to the hydraulic operation pressure on the basis of a coefficient in correspondence to kind of work of a plurality of said operation mechanisms; a fluctuation amount calculating device that calculates a fluctuation amount of the hydraulic operation pressure; an operation position estimating device that estimates an operation position of an arm of said operation mechanism on the basis of said integrated value, wherein said estimated operation position is calculated by multiplying said integrated value of each of the operation pressures by the coefficient set per operation pressure in accordance with the kind of the work, and adding in the case of the rising (dump) operation or subtracting in the case of the falling (crowd) operation; and an abnormal operation detecting device that detects an overload operation of said machine on the basis of said estimated operation position and said fluctuation amount; wherein in calculation of said estimated operation position it is determined whether or not a joint output is beyond a previously set threshold value, If said joint output is beyond the threshold value, then an attitude flag is scraped down; wherein in calculation of said estimated operation position it is further determined whether or not a total of the fluctuation amount of the of the hydraulic operation pressure is beyond a previously set threshold value, if the total of the fluctuation amount of the hydraulic operation pressure is beyond the threshold value than the overload operation is carried out, and outputs to an external portion of the abnormal operation detecting device.