초록 ▼

A multiple sensing technology-based occupancy sensor. Ultrasonic and infrared sensors are used to produce first and second occupancy estimator signals that are combined using a fusion based detection algorithm to produce a combined estimator signal. The combined estimator is then used to switch elec

A multiple sensing technology-based occupancy sensor. Ultrasonic and infrared sensors are used to produce first and second occupancy estimator signals that are combined using a fusion based detection algorithm to produce a combined estimator signal. The combined estimator is then used to switch electrical loads when the combined estimator signal is above a predetermined threshold. The result is an occupancy sensor that has a very high probability of occupancy detection and a low probability of false tripping.

대표청구항 ▼

1. An occupancy based load controller, comprising:a plurality of occupancy sensors for producing a respective plurality of occupancy estimator signals, each indicative of motion within a space; a programmable microprocessor, connected to said plurality of occupancy sensors, for calculating a composi

1. An occupancy based load controller, comprising:a plurality of occupancy sensors for producing a respective plurality of occupancy estimator signals, each indicative of motion within a space; a programmable microprocessor, connected to said plurality of occupancy sensors, for calculating a composite occupancy estimator from said plurality of occupancy estimator signals, and for comparing said composite occupancy estimator to a programmable composite activation threshold, said programmable microprocessor being operable to adaptively adjust a sensitivity of at least one of said plurality of occupancy sensors; a controllable load energizing device responsive to said programmable microprocessor, operable to automatically energize an electrical load when said microprocessor determines that said composite occupancy estimator is greater than said composite activation threshold; and wherein said sensitivity of said at least one of said plurality of occupancy sensors is adjusted by said programmable microprocessor as a function of an energization state of said electrical load, said programmable microprocessor calculating an average time between determinations by said programmable microprocessor that said composite occupancy estimator is greater than said composite activation threshold, wherein said sensitivity of said at least one of said plurality of occupancy sensors is adjusted by said programmable microprocessor as a function of said average time.