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System and method for detecting fluid delivery system conditions based on motor parameters

  • US 7,941,294 B2
  • Filed: 02/10/2009
  • Issued: 05/10/2011
  • Est. Priority Date: 02/10/2009
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a condition in a fluid delivery system, said apparatus comprising:

  • a motor control configured to provide electric power to an electric motor;

    a logic circuit in communication with the motor control; and

    a memory in communication with the logic circuit, wherein the memory is configured to store a first rate threshold associated with a register condition;

    wherein the logic circuit is configured to (1) determine at least one motor parameter at a plurality of different times, and (2) compute a rate of change value in the at least one motor parameter, and (3) determine a register condition if the computed rate of change value exceeds the first rate threshold;

    wherein the at least one motor parameter is system current, system power, system efficiency, motor current, motor power, or motor efficiency;

    wherein the system comprises a filter and wherein the memory stores a nominal motor parameter value and a maximum motor parameter value;

    wherein the logic circuit is configured to compute a filter life parameter based on the nominal motor parameter value, the maximum motor parameter value, and the at least one determined motor parameter; and

    wherein the system comprises a register and wherein the logic circuit is configured to adjust the nominal motor parameter in the memory to account for at least one determined register condition.

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