Occupancy detection system and method having automatic adaptation capabilities

摘要

An occupancy detection system includes a motion detector, one or more sound detectors and a lighting controller configured to turn on and off one or more lighting devices in a defined area based on detected occupancy states. Lighting control circuitry determines occupancy states based on motion detector output signals and sound detector output signals, and further controls associated lighting devices to be turned ON or OFF in accordance with determined occupancy states and an automatically adaptable timeout period. The timeout period is automatically adjusted in accordance with newly recorded time stamps for lighting status changes, based on a second order occupancy distribution analysis such as a Gaussian probability distribution function, with an occupancy curve adjusted for each newly recorded set of time stamps and the timeout period being adjusted according to the mean and variance of the occupancy curve.

主权项

1. An occupancy detection system comprising:
a motion detector effective to provide an output signal based on detected motion in a defined area; a sound detector effective to provide an output signal based on detected sound in the defined area; and a lighting controller effective to
determine a first occupancy state based on a received motion detector output signal and a second occupancy state based on a received sound detector output signal,control one or more associated lighting devices to be turned from OFF to ON in accordance with a determined first occupancy state of ON,control the lighting devices to be turned from ON to OFF in accordance with determined first and second occupancy states of OFF for longer than a timeout period,record time stamps in association with events causing the lighting devices to be turned OFF and in association with events causing the lighting devices to be turned ON, andautomatically adjust the timeout period upon receiving new time stamps based on a second order occupancy distribution analysis including each of the recorded time stamps and comprising an occupancy curve having a mean and a variance associated with a Gaussian probability distribution function, the occupancy curve being adjusted for each newly recorded set of time stamps and the timeout period being adjusted according to the mean and variance of the occupancy curve.