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AssigneesKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Kobelco Construction Machinery Co., Ltd.
InventorsNobuyuki TOMOCHIKA, Hideki YOSHIHARA
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A malfunction diagnosing device that includes pistons arranged in a circumferential direction and discharges oil with rotation in the circumferential direction is provided, including: a pressure sensor for detecting a pressure value of oil discharged from a hydraulic pump in rotation; a speed sensor for detecting a rotation phase of the hydraulic pump at a time when a pressure value of oil is detected by the pressure sensor; a phase calculation part; and a rendering part for rendering a model of a relationship between pressure values of oil detected by the pressure sensor and rotation phases of the hydraulic pump detected by the speed sensor and the phase calculation part to thereby obtain pulsating waveform data. This makes it possible to diagnose a malfunction of the hydraulic pump without influence of a change in a rotation speed of the hydraulic pump.
A device for diagnosing a malfunction of a hydraulic pump that includes a plurality of pistons arranged in a circumferential direction and discharges liquid with rotation in the circumferential direction, comprising:
Dependencies are inferred from the claim text.