Patent ID: 8175836
Filing Date: 2012-05-08
Classification: F24F,Y02B

Abstract:
1. A method of generating a drive signal for a characterized blower system including a motor, a blower driven by the motor, and a blower control that produces a drive signal for the motor using at least one of electric hardware and software, said method comprising: (a) generating a drive signal using the blower control and running the motor; (b) estimating a torque and a speed of the running motor; (c) assuming a starting airflow estimate; (d) calculating torque based on the estimated speed and the estimated airflow; (e) calculating a torque error as a function of the calculated torque and the estimated torque; (f) revising estimated airflow based on the calculated torque error; and (g) repeating steps (d) through (f) using the revised estimated airflow until the torque error is within a predetermined acceptable range, (h) using the blower control to produce a modified drive signal that decreases an offset between the estimated air flow obtained in step (g) and a demanded air flow.