Hydraulic pump failure diagnosis device, construction machinery equipped with failure diagnosis device, failure diagnosis method and failure diagnosis program

摘要

PROBLEM TO BE SOLVED: To provide a failure diagnosis device for a hydraulic pump by a calculation method having a small calculation load with a small number of sensor devices without being affected by an ambient environment such as atmospheric pressure fluctuation due to weather or altitude. A failure diagnosis device 65 divides a time-series data storage unit 651 that stores the pressure in a case of a hydraulic pump as time-series pressure data according to a time series, and a time-series pressure data into a plurality of sections having a constant width. It is provided with a variation calculation unit 652 that calculates the variation of the section data obtained, and an abnormality determination unit 653 that determines an abnormality of the hydraulic pump based on the magnitude of the variation. [Selection diagram] Fig. 2