An adaptive motor control for a furnace with or without an evaporator coil determines and delivers the desired CFM for each thermostat cycle. Specifically, a circulating air blower driven by an ECM is initially set at a known duty cycle for each thermostat cycle and the delivered CFM is calculated. The...http://www.google.fr/patents/US4648551?utm_source=gb-gplus-shareBrevet US4648551 - Adaptive blower motor controller
