Patent ID: 9285058
Filing Date: 2016-03-15
CPC Classification: F16K,G05B

Claim Text:
1. A regulator valve fault checking method for performing fault checking of a regulator valve regulating the flow of a fluid, comprising the steps of: periodically sampling a signal inputted into the regulator valve and, a degree of valve opening outputted from the regulator valve; calculating a speed of change of the sampled input signal; calculating a speed of change of the sampled degree of valve opening; calculating a weighting using the speed of change of the input signal and the speed of change of the degree of valve opening, and a weighting function that has been established in advance; and fault checking of the regulator valve using the sampled input signal, the sampled degree of valve opening and the calculated weighting, wherein the weighting function is a function where the weighting is large when the absolute values of the speed of change of the input signal and the speed of change of the valve opening are in ranges that are less than threshold values, wherein the step of performing the fault checking calculates a fault check indicator value, and wherein a specific time interval set in advance is used as a fault check evaluating interval, where the input signals and degrees of valve opening for which the weightings are calculated to be no less than a specific value are defined as valid data, and a fault check indicator value for use when performing fault checking of the regulator valve is calculated based on the input signals and degrees of valve opening that have been defined as valid data during the fault check evaluation time interval.