Oil vibration diagnosis apparatus and oil vibration diagnosis method

An oil vibration diagnosis apparatus for diagnosing occurrence of oil vibration within an oil passage in a control valve device, the oil vibration diagnosis apparatus comprising:

• a pressure sensor that measures a pressure of oil within the oil passage;
• an amplitude detection unit that detects an amplitude of pressure fluctuations on the basis of a measurement result of the pressure sensor;
• a period detection unit that detects a period of pressure fluctuations on the basis of the measurement result of the pressure sensor;
• a diagnosis unit that diagnoses an oil vibration state or an oil non-vibration state on the basis of the amplitude and the period;
• an oil vibration state duration time determination unit that determines a duration time of the oil vibration state on the basis of a diagnostic result of the diagnosis unit;
• and
• an output unit that outputs information on the basis of a determination result of the oil vibration state duration time determination unit,
• wherein the diagnosis unit diagnoses the oil vibration state when the amplitude is greater than a reference amplitude value and when the period is less than a reference period value, and
• wherein the output unit outputs warning information when the oil vibration state duration time determination unit determines continuation of the oil vibration state for a period greater than or equal to a first reference time.

An oil vibration diagnosis method for diagnosing occurrence of oil vibration within an oil passage in a control valve device, the oil vibration diagnosis method comprising:

• a step (a) of measuring a pressure of oil within the oil passage;
• a step (b) of detecting an amplitude of pressure fluctuations on the basis of a measurement result obtained in the step (a);
• a step (c) of detecting a period of pressure fluctuations on the basis of the measurement result obtained in the step (a);
• a step (d) of diagnosing an oil vibration state or an oil non-vibration state on the basis of the amplitude obtained in the step (b) and on the basis of the period obtained in the step (c);
• a step (e) of determining a duration time of the oil vibration state on the basis of a diagnostic result in the step (d);
• and
• a step (f) of outputting information on the basis of a determination result in the step (e),
• wherein, in the step (d), the oil vibration state is diagnosed when the amplitude is greater than a reference amplitude value and when the period is less than a reference period value, and
• wherein, in the step (f), warning information is output when continuation of the oil vibration state for a period greater than or equal to a first reference time is determined in the step (e).