JPH03100485A - Speed detecting device - Google Patents

Speed detecting device

Info

Publication number
JPH03100485A
JPH03100485A JP23878389A JP23878389A JPH03100485A JP H03100485 A JPH03100485 A JP H03100485A JP 23878389 A JP23878389 A JP 23878389A JP 23878389 A JP23878389 A JP 23878389A JP H03100485 A JPH03100485 A JP H03100485A
Authority
JP
Japan
Prior art keywords
frequency
ultrasonic wave
200khz
transmitter
road
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23878389A
Other languages
Japanese (ja)
Inventor
Seiji Okada
Hiroyuki Nakamura
Toshimi Okazaki
Yoriichi Tsuji
Original Assignee
Mazda Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP23878389A priority Critical patent/JPH03100485A/en
Publication of JPH03100485A publication Critical patent/JPH03100485A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect a stable running speed with high accuracy by transmitting an ultrasonic wave of a frequency exceeding a specific value to a road surface, enlarging the radio of an irregular reflection and utilizing a Doppler effect.
CONSTITUTION: A transmitter 2 transmits a continuous ultrasonic wave whose frequency is about 200kHz by a signal of a function generator 1, and the ultrasonic wave is brought to irregular reflection by the road surface 3 and a part thereof is made incident on a receiver 4 installed at a distance of about 70mm from the transmitter 2. The frequency of the incident ultrasonic wave is shifted by a frequency corresponding to Δf from 200kHz by a Doppler effect, and the receiver 4 converts it to an electric signal having a frequency of 200kHz±Δf. The electric signal becomes time series data through an amplifier 5 and a BPF 6 and stored in a digital memory 7, and a computer 8 fetches successively the data, and can detect a car speed, based on a prescribed arithmetic program.
COPYRIGHT: (C)1991,JPO&Japio
JP23878389A 1989-09-14 1989-09-14 Speed detecting device Pending JPH03100485A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23878389A JPH03100485A (en) 1989-09-14 1989-09-14 Speed detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23878389A JPH03100485A (en) 1989-09-14 1989-09-14 Speed detecting device

Publications (1)

Publication Number Publication Date
JPH03100485A true JPH03100485A (en) 1991-04-25

Family

ID=17035216

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23878389A Pending JPH03100485A (en) 1989-09-14 1989-09-14 Speed detecting device

Country Status (1)

Country Link
JP (1) JPH03100485A (en)

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