Hydraulic machine, system for monitoring health of hydraulic machine, and method thereof

A hydraulic pump health monitoring method for a hydraulic pump which discharges pressurized operating oil and supplies the operating oil to a hydraulic loading device, comprising the steps of:

• collecting time series data of a filter differential pressure across a drain filter of said hydraulic pump;
• collecting time series data of a specified operating status for said hydraulic pump;
• determining a representative differential pressure value which is a representative value of said filter differential pressure under said operating status which meets specified fixed conditions based on said time series data of said collected operating status and said time series data of said filter differential pressure;
• and
• diagnosing said hydraulic pump health based on said determined representative differential pressure value.

A hydraulic pump health monitoring system for a hydraulic machine, comprising a hydraulic pump, a drain filter for capturing contaminants included in operating oil which flows to a drain of said hydraulic pump, a differential pressure sensor which measures a filter differential pressure across said drain filter, and an operating status sensor which detects a specified operating status of said hydraulic pump, comprising:

• a local controller connected to said hydraulic machine;
• and
• a central server which is placed in a location separated from said hydraulic machine and which can communicate with said local controller;
• said local controller of said hydraulic machine comprising:
• a data collector which collects time series data of said filter differential pressure and time series data of said operation status from said differential pressure sensor and said operating status sensor of said hydraulic machine;
• a representative differential pressure determining unit which determines a representative differential pressure value which is said representative filter differential pressure value 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
• a transmission unit which transmits to said server said representative differential pressure value determined by said representative differential pressure determining unit;
• said central server comprising:
• a receiving unit which receives said representative differential pressure value from said local controller;
• and
• a diagnostic unit which diagnoses the health of said hydraulic machine based on said received representative differential pressure value.

A hydraulic pump health monitoring system for a hydraulic machine, comprising a hydraulic pump, a drain filter which captures contaminants included in operating oil which flows to a drain of said hydraulic pump, a differential pressure sensor which measures a filter differential pressure across said drain filter, and a temperature sensor which measures the temperature of said operating oil, comprising:

• a data collector which collects time series data of said filter differential pressure and time series data of said oil temperature from said differential pressure sensor and said temperature sensor;
• a correcting unit which uses said time series data of said oil temperature collected by said data collector and corrects said time series data of said filter differential pressure to reduce the temperature induced variable component therein;
• and
• a diagnostic unit which diagnoses the health of said hydraulic pump based on said time series data of said filter differential pressure corrected by said correcting unit.

A hydraulic pump health monitoring system for a hydraulic machine, comprising a hydraulic pump, a drain filter which captures contaminants included in operating oil which flows to a drain of said hydraulic pump, and a differential pressure sensor which measures a filter differential pressure across said drain filter, comprising:

• a data collector which collects time series data of said filter differential pressure from said differential pressure sensor;
• a correlative relationship determining unit which determines a correlative relationship between time lapse and an increase of said filter differential pressure based on said time series data of said filter differential pressure collected by said data collector;
• and
• a lifespan estimator which estimates the lifespan of said hydraulic pump based on said correlative relationship determined by said correlative relationship determining unit.

A hydraulic pump health monitoring system for a hydraulic machine, comprising a hydraulic pump, a drain filter which captures contaminants included in operating oil which flows to a drain of said hydraulic pump, a differential pressure sensor which measures a filter differential pressure across said drain filter, and a temperature sensor which measures the temperature of said operating oil, comprising:

• a data collector which collects time series data of said filter differential pressure from said differential pressure sensor;
• a correlative relationship determining unit which determines a correlative relationship between the lapse time over a specified long period of time and said filter differential pressure based on said time series data of said filter differential pressure collected by said data collector;
• and
• a judgment unit which determines a degree of deviation between said long-term correlative relationship determined by said correlative relationship determining unit and said filter differential pressure data over a specified recent short period of time, and estimate the lifespan or judge said hydraulic pump abnormalities based on said determined degree of deviation.