Patent ID: 6931772
Filing Date: 2005-08-23
Classification: E02F,G01G

Abstract:
1. A work amount detection device for a hydraulic excavator which scoops a material with a bucket thereof and transfers the material to a different location, said work amount detection device comprising: transfer start detecting means for detecting start of the transfer of the material to the different location; transfer end detecting means for detecting end of the transfer of the material to the different location; load computing means for periodically computing weight of the material in the bucket during the transfer; average value computing means for computing an average value of weights of the material periodically computed by said load computing means, the weights of the material including a currently computed weight and a predetermined number of weights computed prior to the currently computed weight; standard deviation computing means for computing, based on the average value computed by said average value computing means, a standard deviation of the weights of the material including the currently computed weight and the predetermined number of weights computed prior to the currently computed weight; and true load value determining means for selecting a minimum standard deviation from among the standard deviations computed by said standard deviation computing means from the start of the transfer of the material to the different location until the end of the transfer of same, and judging the average value based on which the minimum standard deviation was computed, to be a true value of the weight of the material.