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Gas flow control method in a blower based ventilation system

  • US 7,487,773 B2
  • Filed: 09/24/2004
  • Issued: 02/10/2009
  • Est. Priority Date: 09/24/2004
  • Status: Active Grant
First Claim
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1. A method of controlling the rate of gas flow induced by a variable speed fan in a breathing assistance system, comprising the steps of:

  • receiving a user setting for a target flow rate;

    measuring a back pressure experienced by the fan;

    calculating a target fan speed for producing the target flow rate set by the user based at least on the measured back pressure; and

    controlling the variable speed fan based at least on the calculated target fan speed.

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