JPS5647737A - Detection of condition of road surface - Google Patents

Detection of condition of road surface

Info

Publication number
JPS5647737A
JPS5647737A JP12488179A JP12488179A JPS5647737A JP S5647737 A JPS5647737 A JP S5647737A JP 12488179 A JP12488179 A JP 12488179A JP 12488179 A JP12488179 A JP 12488179A JP S5647737 A JPS5647737 A JP S5647737A
Authority
JP
Japan
Prior art keywords
condition
road surface
output
level
receiver
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.)
Granted
Application number
JP12488179A
Other languages
Japanese (ja)
Other versions
JPS601574B2 (en
Inventor
Hiroshi Fukamizu
Takateru Kotake
Seiya Matsuoka
Masagashi Nakano
Iichi Hirao
Taro Yamazaki
Kunio Iba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEO GIKEN KK
REO GIKEN KK
Omron Corp
Original Assignee
LEO GIKEN KK
REO GIKEN KK
Omron Tateisi Electronics Co
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 LEO GIKEN KK, REO GIKEN KK, Omron Tateisi Electronics Co filed Critical LEO GIKEN KK
Priority to JP12488179A priority Critical patent/JPS601574B2/en
Priority to DE19803023444 priority patent/DE3023444C2/en
Publication of JPS5647737A publication Critical patent/JPS5647737A/en
Publication of JPS601574B2 publication Critical patent/JPS601574B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • G01W1/14—Rainfall or precipitation gauges
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
    • G08B19/02—Alarm responsive to formation or anticipated formation of ice
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F27/00—Combined visual and audible advertising or displaying, e.g. for public address
    • G09F27/005—Signs associated with a sensor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
    • G09F2007/005—Signs associated with a sensor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Atmospheric Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To detect condition of frozen road surface accurately without being affected by sprayed snow-melting agent and variation in meteorological conditions, ete., by detecting condition of freezing by determining difference in near infrared absorption between water and ice using a road surface condition determining circuit. CONSTITUTION:A light-projecting passage 3 is attached to the top of a supporting column 5, and an infrared ray receiver 1 and a visible light receiver 2 are attached to a supporting arm 6. An infrared ray reflecting light signal put out from the light receiver 1 is amplified to an appropriate level by an amplifier 11 and sent over to a low region passing filter 12 to have the outside turbulence noise removed and then put into comparators 13 and 14. A visible light reflecting light signal put out from the light receiver 2 is also processed in the same manner. A discriminating level A1 is set between output level of a filter 12 in frozen condition and the same output level in snow-covered or wet condition, and an output 1 is generated when the output A1 is exceeded.
JP12488179A 1979-06-29 1979-09-27 Road surface condition detection method Expired JPS601574B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP12488179A JPS601574B2 (en) 1979-09-27 1979-09-27 Road surface condition detection method
DE19803023444 DE3023444C2 (en) 1979-06-29 1980-06-23 Device for determining the weather-related road conditions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12488179A JPS601574B2 (en) 1979-09-27 1979-09-27 Road surface condition detection method

Publications (2)

Publication Number Publication Date
JPS5647737A true JPS5647737A (en) 1981-04-30
JPS601574B2 JPS601574B2 (en) 1985-01-16

Family

ID=14896397

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12488179A Expired JPS601574B2 (en) 1979-06-29 1979-09-27 Road surface condition detection method

Country Status (1)

Country Link
JP (1) JPS601574B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01154868A (en) * 1987-12-11 1989-06-16 Nkk Corp Cold scarfer

Also Published As

Publication number Publication date
JPS601574B2 (en) 1985-01-16

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