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Condition responsive pump control utilizing integrated, commanded, and sensed flowrate signals

  • US 4,795,314 A
  • Filed: 08/24/1987
  • Issued: 01/03/1989
  • Est. Priority Date: 08/24/1987
  • Status: Expired due to Term
First Claim
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1. Pump control apparatus comprisinga variable flowrate pump including an electric motor controllable in response to a pump drive signal,a signal generator generating a commanded flowrate signal indicating desired flowrate of said pump,a flowrate sensor providing a sensed flowrate signal indicating sensed flowrate of said pump, andan integrator connected to said sensor and generator to receive and integrate said commanded flowrate signal and said sensed flowrate signal, said integrator maintaining an electrical signal representing the difference over time in volume commanded to be pumped and the volume pumped, said integrator providing said pump drive signal based on said electrical signal, said pump drive signal being increased based on said commanded flowrate signal, thereby increasing the speed of said motor, and being decreased based on said sensed flowrate signal, thereby decreasing the speed of said motor, so as to achieve desired commanded volume over time.

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