System for automatically detecting presence or absence of a prec

Details System for automatically detecting presence or absence of a prec System for automatically detecting presence or absence of a prec

1985-05-30

1987-12-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 5, G01N 2186

Patent

active

047162988

ABSTRACT:
A system for detecting the presence or absence of a vehicle in front of a subject vehicle and method therefor, wherein a plurality of wave transmitters transmit distance measuring media such as laser beams or electromagnetic waves over a front detection area toward which the distance measuring media are transmitted in mutually different directions and through respectively predetermined angles with respect to a longitudinal axis of the subject vehicle. In the detecting system and method, the presence of the preceding vehicle is determined on the basis of propagation delay between the times at which at least one of the waves is transmitted and at which the reflected waves are received. The lateral progress of the vehicle in front of the subject vehicle from detection area to detection area is monitored to maintain contact with the detected vehicle even around curves or during steering adjustments.

REFERENCES:
patent: 4552456 (1985-11-01), Endo
patent: 4621705 (1986-11-01), Etoh
patent: 4634272 (1987-01-01), Endo
patent: 4670845 (1976-06-01), Etoh

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