METHOD FOR CONTROLLING CONSTANT AIR VOLUME OF ECM MOTOR IN HVAC SYSTEM

摘要

A method for controlling constant air volume of an ECM motor in an HVAC system. The method includes: a) acquiring a target air volume Q_set input from an external, determining a function I_tad=f(n) corresponding to the target air volume Q_set by the microprocessor, in which I_tad represents a bus current, n represents a rotational speed of the motor; b) acquiring a calculated bus current I_tad according to the rotational speed n and the function I_tad=f(n), and detecting a real-time bus current I_bus; and c) comparing the calculated bus current I_tad with the real-time bus current I_bus by the microprocessor for closed-loop control; when I_tadI_bus, increasing the rotational speed n of the motor; when I_tadI_bus, decreasing the rotational speed n of the motor; and when I_tad=I_bus, stopping regulating the rotational speed n and returning to B) for continuing the control of the constant air volume.