An automatic HVAC control system having a scheduled control in which the HVAC control variables are regulated in accordance with an empirically determined schedule to provide a desired comfort level in the vehicle, and an adaptive control which modifies the scheduled control when stall or overshoot conditions...http://www.google.ca/patents/US4794537?utm_source=gb-gplus-sharePatent US4794537 - Scheduled comfort control system with adaptive compensation for stall and overshoot
