JPH04105083A - Road condition detecting device - Google Patents

Road condition detecting device

Info

Publication number
JPH04105083A
JPH04105083A JP22467890A JP22467890A JPH04105083A JP H04105083 A JPH04105083 A JP H04105083A JP 22467890 A JP22467890 A JP 22467890A JP 22467890 A JP22467890 A JP 22467890A JP H04105083 A JPH04105083 A JP H04105083A
Authority
JP
Japan
Prior art keywords
road
waves
wave
signals
detecting
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
JP22467890A
Other languages
Japanese (ja)
Inventor
Toshimi Okazaki
Seiji Okada
Yoriichi Tsuji
Hajime Yamane
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 JP22467890A priority Critical patent/JPH04105083A/en
Publication of JPH04105083A publication Critical patent/JPH04105083A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable a detectable road surface roughness range to be widely and accurately detected by transmitting an ultrasonic wave to a road, detecting the intensity of an irregular reflection wave received from the road and detecting a road condition on the basis of the detected wave intensity.
CONSTITUTION: A transmitter 21 sends an ultrasonic wave having the prescribed frequency to a road 200 on the basis of an electrical signal having the prescribed frequency generated with an ultrasonic wave supply source 10. A receiver 22 is so positioned as to be capable of receiving irregular reflection waves, among reflection waves generated due to the aforesaid wave transmission. The received ultrasonic waves are converted into electrical signals and the signals amplified in an amplifier circuit 31 are detected in an AM detection circuit 32, thereby obtaining detection signals with the amplitude components thereof taken out. Thereafter, a high frequency components are eliminated from the signals in a low pass filter circuit 33, and a road condition detecting signal is outputted. Furthermore, a direction for the transmitter 21 to send waves to the road 200, another direction for the receiver 22 to receive the irregular reflection waves from the road 200 and a vehicle travel direction as shown by an arrow V are so set as to form an angle of approximately 90 degrees, thereby eliminating an error component attributable a Doppler effect.
COPYRIGHT: (C)1992,JPO&Japio
JP22467890A 1990-08-27 1990-08-27 Road condition detecting device Pending JPH04105083A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22467890A JPH04105083A (en) 1990-08-27 1990-08-27 Road condition detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22467890A JPH04105083A (en) 1990-08-27 1990-08-27 Road condition detecting device

Publications (1)

Publication Number Publication Date
JPH04105083A true JPH04105083A (en) 1992-04-07

Family

ID=16817510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22467890A Pending JPH04105083A (en) 1990-08-27 1990-08-27 Road condition detecting device

Country Status (1)

Country Link
JP (1) JPH04105083A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428359A (en) * 1992-10-20 1995-06-27 Toyota Jidosha Kabushiki Kaisha Doppler-effect vehicle speed sensor using different speed determining rules depending upon receiver output
US6909893B2 (en) * 2000-03-15 2005-06-21 Denso Corporation Wireless communication system, fixed base station and mobile terminal station

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428359A (en) * 1992-10-20 1995-06-27 Toyota Jidosha Kabushiki Kaisha Doppler-effect vehicle speed sensor using different speed determining rules depending upon receiver output
EP0738901A2 (en) * 1992-10-20 1996-10-23 Toyota Jidosha Kabushiki Kaisha Doppler-effect vehicle speed sensor using different speed determining rules depending upon receiver output
EP0738901A3 (en) * 1992-10-20 1996-11-20 Toyota Jidosha Kabushiki Kaisha Doppler-effect vehicle speed sensor using different speed determining rules depending upon receiver output
US6909893B2 (en) * 2000-03-15 2005-06-21 Denso Corporation Wireless communication system, fixed base station and mobile terminal station

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