Patent ID: 6549826
Filing Date: 2003-04-15
Classification: G05B

Abstract:
A method for initializing a control system for a variable airflow apparatus so as to reduce subsequent calculations, said apparatus having an airflow sensor for providing an airflow sensor signal to an airflow controller, a stored relationship representative of a plot of airflow sensor signal values versus airflow values having a first portion of relatively low airflow signal values and relatively low air flows, a damper for varying airflow, and an actuator for positioning said damper, comprising the steps of:energizing said airflow controller; determining a first slope of a portion of said plot within said first portion; determining an intersection of said first slope with an absolute minimum voltage value or an absolute minimum airflow value; setting a first limit on an allowed minimum airflow based on said intersection; and subsequently periodically positioning said damper, in response to a signal from said airflow controller, to provide an airflow value that is limited by said first limit.