Patent ID: 7082758
Filing Date: 2006-08-01
Classification: E02F,F04B,F15B,F16D

Abstract:
1. A hydraulic machine, comprising: a hydraulic loading device; a hydraulic pump which discharges pressurized operating oil and supplies the operating oil to said hydraulic loading device; a drain filter which captures contaminants included in the operating oil which flows into the drain of said hydraulic pump; a differential pressure sensor which measures a filter differential pressure across said drain filter; an operating status sensor which measures a specified operating status of said hydraulic pump; a data collector which collects time series data of said filter differential pressure and time series data of said operating status from said differential pressure sensor and said operating status sensor; and a representative differential pressure determining unit which determines a representative differential pressure value which is the representative value of said filter differential pressure under said operating status which meets specified fixed conditions based on said time series data of said operating status and said time series data of said filter differential pressure collected by said data collector, and which output said determined representative differential pressure value.