| 摘要 |
An abnormality diagnosis apparatus for an electric pump prevents an erroneous decision that a normally functioning electric pump has an abnormality. When a motor is driven by a current of the driving motor using an upper limit current Ialpha before a predetermined time T1 passes, it is decided that there is a probability that an abnormality occurs in the pump and the decision is reported to an external device when the number of rotations of the motor is less than the lower limit number of rotations set under lower limit temperature of a hydraulic oil. When the motor is driven by limiting the current of the motor by Ibeta and Igamma (<Ialpha) after T1 passes, it is decided that there is a probability of occurrence of an abnormality when rotation of the motor stops and the decision is reported to the external device.
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