Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1990-11-05
1991-11-19
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367 98, G01S 1500
Patent
active
050671154
ABSTRACT:
An ultrasonic obstacle sensor for sensing an obstacle on a road surface is disclosed which projects ultrasonic waves in the form of pulses toward the forwardly distant surface of a road in a downwardly inclined forward direction, and which is able to discriminate an obstacle on the road surface through reflection waves therefrom in a most effective and reliable manner. To this end, a timing instructor intermittently generates an instruction signal, based on which ultrasonic waves are generated. An ultrasonic transmitter projects the ultrasonic waves thus generated toward a road surface, and the reflected waves therefrom are received by an ultrasonic receier which in turn generates a reception signal. A reception signal processor AM detects the reception signal to provide an AM modulation signal. A time calculator calculates a time elapsing from the generation of the instruction signal. A discrimination signal generator generates a discrimination signal having an intensity which increases before the lapse of a predetermined time from the time of generation of the instruction signal, and decreases thereafter. A comparison circuit makes a comparison between the AM modulation signal and the discrimination signal to generate an output signal representative of the presence or absence of an obstacle on the road surface.
REFERENCES:
patent: 4912967 (1990-04-01), Shiraishi et al.
patent: 4975889 (1990-12-01), Petrucelli et al.
patent: 4991146 (1991-02-01), Ransdell et al.
Obstacle Avoidance with Ultrasonic Sensors, IEEE Journal, vol. 4, No. 2, Apr. 1988.
Application Technology of Cooperative Laser Radar System for Automobiles on Expressways, IEEE Tokyo, No. 26, 1987.
Mitsubishi Denki K.K.
Pihulic Daniel T.
LandOfFree
Ultrasonic obstacle sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ultrasonic obstacle sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrasonic obstacle sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1375129