JPS648499A - Road surface discriminating device - Google Patents
Road surface discriminating deviceInfo
- Publication number
- JPS648499A JPS648499A JP16450787A JP16450787A JPS648499A JP S648499 A JPS648499 A JP S648499A JP 16450787 A JP16450787 A JP 16450787A JP 16450787 A JP16450787 A JP 16450787A JP S648499 A JPS648499 A JP S648499A
- Authority
- JP
- Japan
- Prior art keywords
- road surface
- receiving part
- difference
- light
- state
- 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
- Traffic Control Systems (AREA)
Abstract
PURPOSE:To surely measure a difference between a regular reflection signal and an irregular reflection signal even if a road surface is similar to a mirror surface due to its wet state or the like and to improve the decision accuracy of a road surface state by arranging an irregular reflection receiving part on the opposite side to a regular reflection receiving part with respect to a light source. CONSTITUTION:Light flux 9 from the light source 2 in a housing 1 is reflected on a detecting position 7 on a road surface, the regularly reflected flux 10 is made incident upon the regular reflection receiving part 3 and irregularly reflected beams 11 are made incident upon the irregular reflection receiving part 4. A processing part 6 amplifies and compares signals obtained from respective receiving parts 3, 4 and outputs a signal. When the road surface is dried or snowed, a difference of received light between regular reflection and irregular reflection is small and the state is discriminated by the size of the difference. In case of wet or frozen state, the difference of receiving light is large, and when a reflective thermome ter 5 indicates <=0 deg.C, the frozen state is discriminated. Since the receiving part 4 is arranged on the opposite side to the receiving part 3 with respect to the light source 2, an angle formed by the light fluxes 10, 11 can be increased, and even if the road surface goes similar to a mirror surface, the discriminating accuracy can be improved by increasing the output difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16450787A JPS648499A (en) | 1987-07-01 | 1987-07-01 | Road surface discriminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16450787A JPS648499A (en) | 1987-07-01 | 1987-07-01 | Road surface discriminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS648499A true JPS648499A (en) | 1989-01-12 |
Family
ID=15794473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16450787A Pending JPS648499A (en) | 1987-07-01 | 1987-07-01 | Road surface discriminating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS648499A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1062340A (en) * | 1996-08-20 | 1998-03-06 | Sharp Corp | Toner density sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS585900A (en) * | 1981-07-02 | 1983-01-13 | オムロン株式会社 | Road surface state discriminator |
-
1987
- 1987-07-01 JP JP16450787A patent/JPS648499A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS585900A (en) * | 1981-07-02 | 1983-01-13 | オムロン株式会社 | Road surface state discriminator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1062340A (en) * | 1996-08-20 | 1998-03-06 | Sharp Corp | Toner density sensor |
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