JPS5565141A - Detection system for frozen road surface - Google Patents
Detection system for frozen road surfaceInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1978
- 1978-11-11 JP JP13917178A patent/JPS5565141A/en active Pending
Cited By (1)
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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