F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 51/00 (2006.01) F04B 49/10 (2006.01) F04B 53/20 (2006.01) F15B 20/00 (2006.01)
Patent
CA 2504225
In a hydraulic machine, hydraulic pump failure is detected and the pump lifespan is estimated before the pump failure occurs. The discharged pressure (122), oil temperature (126), and drain filter differential pressure (120) are measured, a correlative relationship (128) between the filter differential pressure and the discharge pressure is determined, and a representative filter differential pressure (130) is calculated from this correlative relationship. Using an oil temperature - differential pressure correlation function, the representative differential pressure value (130) is corrected so that the variable component (132) caused by the oil temperature (126) is eliminated therefrom. The long-term trend and the short-term trend of the increase over time of the corrected differential pressure is calculated. A pump failure is predicted or the pump lifespan is estimated based on the degree of deviation between the long-term trend and the short-term trend.
Kageyama Masato
Shoji Yukio
Yoshida Nobumi
Ltd. Komatsu
Riches Mckenzie & Herbert Llp
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