Patent ID: 9239306
Filing Date: 2016-01-19
CPC Classification: F04B,F04D,G01N,H02H,H02P

Claim Text:
1. An abnormality diagnosis apparatus for an electric pump which supplies a working fluid based on a command from an external device, the abnormality diagnosis apparatus comprising: a rotation count detecting unit that detects a number of rotations of a motor which drives the electric pump; and a processing unit which decides in a first series of steps that there is a probability of occurrence of an abnormality in the electric pump when detecting a state in which the motor is driven by a current equal to or greater than an upper limit current used upon a normal operation and the number of rotations of the motor is less than a lower limit number of rotations which is set based on a working fluid temperature condition, and which decides in a second series of steps that there is the probability of occurrence of the abnormality when detecting a state in which the motor is driven with a current limited by a current limit value less than the upper limit current and the number of rotations of the motor is less than a predetermined number of rotations which is set lower than the lower limit number of rotations according to limitation of the current limit value indicating that the motor is stopped or close to being stopped, wherein the motor is stopped by the external device when it is decided that there is the probability of occurrence of the abnormality in the electric pump.