| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system accurate extending over a wide range of resistance and insensitive to the influence of noise. <P>SOLUTION: A processor controls pump to pump flow quantities in accordance with a pseudorandom code. Portions of the resulting pressure signal sensed are decoded in accordance with the pseudorandom code. An estimated value of equilibrium pressure is generated from the decoded pressure value, while a summation of pressure samples is generated from the undecoded pressure signals. The resistance to fluid flow of the system is determined from the estimated equilibrium pressure value and the pressure summation. For low flow rates, the processor controls the pump to pump fluid in a series of fluid boluses, with each fluid bolus delivered in the beginning of a separate timeslot. <P>COPYRIGHT: (C)2004,JPO |
