Early Alert Method and Apparatus, Process Instrument Comprising Early Alert Apparatus, and Computing Device

An early alert apparatus for a process instrument, the apparatus comprising:

• a measurement value receiving unit to receive a measurement value of a process variable measured by a process instrument;
• a first estimation value determining unit to predict a linear estimation value using a linear prediction model, which is generated by performing linear fitting on a predetermined number of measurement values recently measured by the process instrument, compare the linear estimation value with a preset warning threshold, and if the linear estimation value is greater than the preset warning threshold, set the linear estimation value as a first estimation value;
• a second estimation value determining unit to analyse a position of a current measurement value in a measurement value cycle of the process variable, compare the current measurement value with a value of the process variable at the same position in the previous cycle to determine a deviation value, then add the deviation value to the previous peak value or trough value to serve as a maximum estimation value, compare the maximum estimation value with the preset warning threshold, and if the maximum estimation value is greater than the preset warning threshold, set the maximum estimation value as a second estimation value;
• an estimation value computing unit to compute a process variable estimation value on the basis of the first estimation value and the second estimation value;
• and
• an overall prediction unit to compare the process variable estimation value with the preset warning threshold, and issue an early alert signal if the process variable estimation value is greater than the preset warning threshold.

A computing device comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, the memory storing an instruction which, when executed by the at least one processor, causes the at least one processor to:
• receive a measurement value of a process variable measured by a process instrument;
• predict a linear estimation value using a linear prediction model generated by performing linear fitting on a predetermined number of measurement values recently measured by the process instrument, comparing the linear estimation value with a preset warning threshold, and if the linear estimation value is greater than the preset warning threshold, setting the linear estimation value as a first estimation value;
• analyse a position of a current measurement value in a measurement value cycle of the process variable, comparing the current measurement value with a value of the process variable at the same position in the previous cycle to determine a deviation value, then adding the deviation value to the previous peak value or trough value to serve as a maximum estimation value, comparing the maximum estimation value with the preset warning threshold, and if the maximum estimation value is greater than the preset warning threshold, setting the maximum estimation value as second estimation value;
• compute a process variable estimation value on the basis of the first estimation value and the second estimation value;
• and compare the process variable estimation value with the preset warning threshold, and issuing an early alert signal if the process variable estimation value is greater than the preset warning threshold.