| 摘要 |
<p>A fluid flow control system includes a weight detector (12), for generating a weight measurement signal that is indicative of the weight of fluid in a reservoir (11); an adjustable reference generator (14) for generating a weight reference signal that is indicative of the desired rate of decrease in weight of the fluid in the reservoir (11); and a comparator (13) that produces an output indicative of the dissimilarity between the weight measurement and the weight reference signals. In a preferred embodiment, a drop counter (21) is placed in the line of flow (16) from the reservoir (11). The drop counter (21) produces an actual drop rate signal. There is also provided a device (22) that generates a programmed drop rate signal. The programmed drop rate signal is modified by the previously described comparator's output to produce a corrected drop rate signal. The actual and the corrected drop rate signals are directed to a second comparator (23) that operates on a flow controller (15).</p> |
