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Method for controlling a bi-level apparatus, and bi-level apparatus

  • US 8,402,969 B2
  • Filed: 09/25/2006
  • Issued: 03/26/2013
  • Est. Priority Date: 03/23/2004
  • Status: Active Grant
First Claim
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1. A method for controlling a bi-level apparatus, comprising:

  • using a flow sensor to repeatedly measure an airflow thereby obtaining measured airflow values;

    choosing an expiration threshold value;

    choosing an inspiration threshold value;

    using a processor to repeatedly compare said airflow values with said expiration threshold value during an expiration mode;

    switching to an inspiration mode if an airflow value is greater than said expiration threshold value in a comparison with said expiration threshold value;

    using the processor to repeatedly compare said airflow values with said inspiration threshold value during said inspiration mode; and

    using the processor to switch to said expiration mode if the airflow value is smaller than said inspiration threshold value in a comparison with said inspiration threshold value, wherein the processor performs the steps of;

    storing a minimum airflow during said expiration mode;

    choosing said inspiration threshold value equal to said stored minimum airflow immediately after switching to said inspiration mode;

    storing a maximum airflow during said inspiration mode; and

    choosing said expiration threshold value equal to said stored maximum airflow immediately after switching to said expiration mode, wherein during a time span shortly after said switching to said inspiration mode up to the end of said inspiration mode, said inspiration threshold value is chosen by the processor to be equal to a difference of a maximum of said airflow during said current inspiration phase minus a predetermined value.

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