| 摘要 |
A system for developing a warning condition output signal when a monitored input variable exceeds a warn profile defined value defined as a predetermined function of an input reference variable, in which the warning condition output signal is delayed by a time tau from the time that a warning condition is sensed. The profile offset thus induced is compensated for by generating an anticipated future value of the reference variable after a time tau from the instant value and rate of change thereof, with the anticipated future value being utilized to generate the warn profile. Lag introduced by filtering which might be employed in generating the anticipated value, as well as any lag time existing between a reference variable failure and a failure condition signal which may be used to inhibit development of a warning condition signal, are then permissible, and are compensated for without profile offset by choosing a delay time tau at least as great as the cumulation of these delays, and conditioning generation of a delayed warning condition signal on a warning signal condition being continuously maintained for a time at least as great as the imposed delay time tau .
|
