| 摘要 |
<p>PROBLEM TO BE SOLVED: To make an accurate decision even when a measured value increases gradually and when the measured value varies abruptly as operation is changed by checking one kind of measured value from various angles and totally deciding the check result by employing main component analysis. SOLUTION: An abnormal value detection logic arithmetic unit 2 consists of two 1st and 2nd devices. The 1st abnormal value detection logic arithmetic unit consists of a basic data arithmetic unit 211, a variation quantity overestimate arithmetic unit 212, a similar instrument comparing arithmetic unit 213, and a prediction error arithmetic unit 214. The 2nd abnormal value detection logic arithmetic unit consists of a trend arithmetic unit 221 and a variation quantity underestimate arithmetic unit 222. The measured value is checked from various angles such as the measured value, variation quantity overestimation, variation quantity underestimation, comparison with similar instruments, trends, and relation with other instruments. Then main component analysis is employed to totally decide the result of abnormal value detection logic.</p> |
