Apparatus and method for detecting obstacles in the path of a mo

Details Apparatus and method for detecting obstacles in the path of a mo Apparatus and method for detecting obstacles in the path of a mo

1983-03-15

1985-11-05

Groody, James J.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Transmitter in one vehicle only

340901, 343 7VM, 367909, 367112, G08G 100, G01S 1300, G01S 1593

Patent

active

045517223

ABSTRACT:
Obstacles in the path of a vehicle are detected by an ultrasonic radar system which measures the time between the instance of transmission of an ultrasonic wave pulse and another instance of reception of an echo signal. The transmitting period is controlled to be retarded from a reference or standard transmitting period by a time length including the measured time at every other transmitting period. The measured time is compared with a reference time to check whether a detected obstacle is within a dangerous range. This comparison is effected at every other transmitting period so that a false detection signal caused from a far obstacles is prevented from being produced. As a result of the comparison an alarming device is energized to alert the vehicle driver when necessary.

REFERENCES:
patent: 3778823 (1973-12-01), Sato
patent: 3860923 (1975-01-01), Yamanaka
patent: 4240152 (1980-12-01), Duncan
patent: 4500977 (1985-02-01), Gelhard

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