Ultrasonic obstacle sensor

Details Ultrasonic obstacle sensor Ultrasonic obstacle sensor

1990-10-15

1991-12-31

Kashnikow, Andres

Motor vehicles

With means for controlling operation responsive to...

Radiation, force, or waves reflected from external object or...

307525, 340943, 36442401, B60Q 500, G08G 116

Patent

active

050763849

ABSTRACT:
Ultrasonic waves are transmitted from an ultrasonic transmitter mounted on a vehicle towards a road surface. An ultrasonic receiver mounted on the vehicle receives ultrasonic waves reflected from the road surface and generates a signal which is amplified by an amplifier. The amplified signal is compared with a reference signal to detect components in the amplified signal due to obstacles on the road surface. The magnitude of the reference signal and/or the amplification factor of the amplifier is controlled to maintain a constant ratio between the average of the reference signal and the average of the amplified signal.

REFERENCES:
patent: 4528563 (1985-07-01), Takeuchi
patent: 4600215 (1986-07-01), Kuroki et al.
patent: 4623032 (1986-11-01), Kemmer
patent: 4833469 (1989-05-01), David
patent: 4849731 (1989-07-01), Melocik
Obstacle Avoidance with Ultrasonic Sensors (pp. 213-218), Borenstein et al, 1988.
Application Technology of Cooperative Laser Radar System for Automobiles on Expressways (pp. 76-78) publication date unknown.

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