Patent ID: 7574324
Filing Date: 2009-08-11
Classification: G05B

Abstract:
1. An abnormality diagnostic method for diagnosing an abnormality which makes a machine to carry out a previously set operation for diagnosis, wherein the machine comprises an actuator and a detector to detect operation data of the actuator, the method comprising: a first step to make the machine to carry out the operation for diagnosis at a time of diagnosing, compare operation data obtained by the detector and operation data at the time of normal driving obtained by previously making the machine to carry out the operation for diagnosis at the time of normal driving, and extract a non-corresponding portion as a characteristic point; a second step to determine an existence of an abnormality of the machine based on the existence of the characteristic point extracted in the first step; a third step to compare the characteristic point extracted in the first step with a characteristic point predicted to occur in the operation data at the time of occurring an abnormality anticipated in a mechanism element constituting an operation system of the machine, and determine a degree of correspondence between the characteristic point extracted in the first step and the characteristic point predicted to occur in the operation data, when the second step determines that the abnormality of the machine exists; and a fourth step to estimate the mechanism element having the abnormality based on the degree of correspondence determined in the third step.