Distance measuring device

Details Distance measuring device Distance measuring device

1990-11-13

1991-12-31

Pihuli, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367 99, G01S 1500

Patent

active

050777017

ABSTRACT:
This invention relates to a distance measuring device, in particular for motor vehicles, in which a converter is utilized for transmission of an ultrasonic signal and also for reception of the echo signal. Thereby the echo signal received by the converter is compared at a comparator with a threshold value after having been appropriately amplified. This threshold value is at a particular changeover time changed over from a first high value, which is independent of time, to a smaller, time-dependent value. Thereby the changeover time is computed from a measured time depending on the dying-out behavior of the converter.

REFERENCES:
patent: 4464738 (1984-08-01), Czajkowski
patent: 4975889 (1990-12-01), Petrucelli et al.

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