Inventors:
Dennis P. Griffin - Noblesville IN, 46060
William W. Fultz - Carmel IN, 46033
International Classification:
G01B 1100
US Classification:
702150, 702152, 702159, 702172, 701 45, 701 46, 280735, 356622
Abstract:
An improved infrared occupant detection system that provides accurate and reliable occupant intrusion information at a speed sufficient to timely inhibit or otherwise control deployment of occupant restraints. An array of infrared emitters is selectively activated to emit a predetermined pattern of IR beams in an area between the passenger seat and the point of deployment of the restraint, and the reflected IR energy is detected by a photo-sensitive receiver and analyzed to determine whether an occupant is out of position for deployment of the restraint. In the preferred embodiment, the intensity of the received beam energy and the position of the respective beam are used to construct a table of individual intrusion factors, and a composite intrusion factor based on the individual intrusion factors is categorized by magnitude to form an indication of occupant intrusion level, which in turn, is used to determine whether, or how forcefully, to deploy the restraint in the event of a serious crash.