JPS5565141A - Detection system for frozen road surface - Google Patents

Detection system for frozen road surface

Info

Publication number
JPS5565141A
JPS5565141A JP13917178A JP13917178A JPS5565141A JP S5565141 A JPS5565141 A JP S5565141A JP 13917178 A JP13917178 A JP 13917178A JP 13917178 A JP13917178 A JP 13917178A JP S5565141 A JPS5565141 A JP S5565141A
Authority
JP
Japan
Prior art keywords
time
road surface
frozen
temperature
output
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
JP13917178A
Other languages
Japanese (ja)
Inventor
Hiroshi Fukamizu
Masashi Nakano
Iichi Hirao
Takaaki Kotake
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.)
Omron Corp
Original Assignee
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP13917178A priority Critical patent/JPS5565141A/en
Publication of JPS5565141A publication Critical patent/JPS5565141A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

PURPOSE: To detect the frozen road surface by outputting the frozen signal if the frozen expect time is exceeded, with the output of digital signal through the measurement of temperature on the road surface and with the calculation of expected time of freezing based on this output.
CONSTITUTION: When the temperature on the road surface falls down and is +1°C or less at the time t1 and the temperature is kept constant almost for 30 minutes until the set time t1', an output is produced from the timer 1 at the time t1'. Simultaneously, the one hour temperature changing amount detection circuit 7 inputs at the time t1' the data of temperature change from the time t0 to the time t1 and the expected time of freezing is calculated from this data at the calculator 12. The comparison circuit 14 outputs the frozen signal when the output continuous time of the timer 13 exceeds the expected time of freezing.
COPYRIGHT: (C)1980,JPO&Japio
JP13917178A 1978-11-11 1978-11-11 Detection system for frozen road surface Pending JPS5565141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13917178A JPS5565141A (en) 1978-11-11 1978-11-11 Detection system for frozen road surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13917178A JPS5565141A (en) 1978-11-11 1978-11-11 Detection system for frozen road surface

Publications (1)

Publication Number Publication Date
JPS5565141A true JPS5565141A (en) 1980-05-16

Family

ID=15239223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13917178A Pending JPS5565141A (en) 1978-11-11 1978-11-11 Detection system for frozen road surface

Country Status (1)

Country Link
JP (1) JPS5565141A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003287577A (en) * 2002-03-28 2003-10-10 Natl Inst For Land & Infrastructure Management Mlit Method for deciding road freezing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003287577A (en) * 2002-03-28 2003-10-10 Natl Inst For Land & Infrastructure Management Mlit Method for deciding road freezing

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