| 摘要 |
<p>The invention is a constant flow pump control system that compensates for a change in gas flow rate that is caused by a change in the load resistance (26), by making the speed change inversely with the change in load resistance, desirably by sensing the change in pressure (30) and changing speed by an amount related to the pump performance characteristic that is required to restore the flow rate to its selected value. In a preferred embodiment the system includes a closed loop pump speed control in which a selected flow rate reference (10) is combined with a pressure feedback (32) to provide an inverse change in the pump speed reference function or a direct change in the motor speed feedback function to compensate for the change in flow rate caused by a change in flow resistance.</p> |
