| 摘要 |
A method and apparatus is provided for monitoring a variable in a system. Actual values of the variables are sensed to produce sensed values. An initial threshold is set below an initially sensed value by a predetermined difference. Thereafter, the threshold is selectively maintained constant and adjusted to follow below the sensed values by a difference which is a function of the sensed values if the sensed values remain constant or increase, with the threshold remaining constant if the sensed values decreases. The threshold is compared with the sensed values and an indication of an unsatisfactory quality is provided if the sensed values fall below the threshold.
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