Patent ID: 6759954
Filing Date: 2004-07-06
Classification: H05B,Y02B

Abstract:
An occupancy based load controller, comprising:a continuous wave ultrasonic transducer and a Doppler shift ultrasonic occupancy sensor for adaptively sampling ultrasonic energy reflected from a space as a function of a level of said energy, for producing an ultrasonic occupancy estimator vector related to a motion within the space; a passive infrared occupancy sensor for producing a passive infrared occupancy estimator vector related to the motion within the space; a programmable microprocessor, connected to said ultrasonic sensor and said passive infrared detector, for calculating a composite occupancy estimator from said occupancy estimator vectors, and for comparing said composite occupancy estimator to a composite activation threshold; and a controllable load energizing device responsive to said programmable microprocessor, operable to automatically energize an electrical load when said microprocessor determines that said occupancy estimator is greater than said activation threshold.