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US 11,669,065 B2Granted
Digital input edge detection with smart filtering algorithm
AssigneeHoneywell International Inc.
InventorsAlan R Foose, Aad Van Wensen, Quang Nguyen
Life of this patent
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Abstract
A method is provided that provides data analysis for sequence of events reporting in the operation of an industrial process. A digital filter and edge detector are provided that combines a method for excluding known invalid samples and a method for excluding samples taken while the input in the traveling range. The filtering method reduces the overhead on the CPU from managing the sequence of events machine and allows it to focus on performing safety functions.
Claims11
A method for detecting and subsequently recognizing abnormal events in a process, said method comprising the steps of:
- obtaining a plurality of samples (103) at a fixed frequency of sampling to provide a known time difference between process data points;
- sending said plurality of samples (103) to a digital filter (100);
- using said digital filter (100) to compare each of said samples against two sets of configurable thresholds (105) wherein said two sets of configurable thresholds are different to provide a set of high and low comparison results;
- determining a relation of each of said samples in comparison (104) to said configurable thresholds;
- determining whether each of said plurality of samples is repeated;
- determining whether each of said plurality of samples is valid or invalid;
- counting a number of the valid samples to be counted as a filter count (108), wherein said filter count increases based on said determined valid sample and high comparison result and said filter count decreases based on said determined valid sample and low comparison result;
- and
- recording an event (109) when a filter count (108) reaches a pre-specified level.
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Dependencies are inferred from the claim text.