A time-based controller provides control for a controlled system including a plant having an integration response. The time-based controller includes a comparator that detects a polarity change in a comparison of a sensed signal from the plant and a reference signal while a control signal is in a first...http://www.google.com/patents/US7647125?utm_source=gb-gplus-sharePatent US7647125 - Time-based control of a system having integration response
