JPS57113381A - Vehicle detector - Google Patents
Vehicle detectorInfo
- Publication number
- JPS57113381A JPS57113381A JP55187503A JP18750380A JPS57113381A JP S57113381 A JPS57113381 A JP S57113381A JP 55187503 A JP55187503 A JP 55187503A JP 18750380 A JP18750380 A JP 18750380A JP S57113381 A JPS57113381 A JP S57113381A
- Authority
- JP
- Japan
- Prior art keywords
- check
- vehicle
- signal
- time width
- vehicle detection
- 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
- 238000001514 detection method Methods 0.000 abstract 4
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Near-Field Transmission Systems (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
PURPOSE:To improve the reliability of vehicle detection by an arrangement wherein equipment on a vehicle is so constructed that it transmits a vehicle detection signal with a square wave amplitude modulation wave of which mark time width is sufficiently larger than space time width. CONSTITUTION:While a vehicle 1 is not entering an enclosed area 2T, a signal inputted to a receiver 5 is only a check-up signal fCH. This check-up signal fCH is inputted to a level decision circuit 5a6 via a filter 5a1, an amplifier 5a2, a remitter 5a3, a demodulator 5a4, and a filter 5a5. The output of the circuit is used to excite a check-up relay CHR, so that an output deciding that the vehicle 1 has not entered the enclosed area 2T is obtained. When the front portion of the vehicle enters the enclosed area 2T, this causes an action suppressing the check-up signal fCH in the remitter 5a3 and the check-up relay CHR drops. The relation between the mark time width M and space time width S of vehicle detection signals f1, f2 is set to M>>S whereby the degree of suppressing the check-up signal fCH is made larger to improve the reliability of vehicle detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55187503A JPS57113381A (en) | 1980-12-31 | 1980-12-31 | Vehicle detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55187503A JPS57113381A (en) | 1980-12-31 | 1980-12-31 | Vehicle detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57113381A true JPS57113381A (en) | 1982-07-14 |
Family
ID=16207197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55187503A Pending JPS57113381A (en) | 1980-12-31 | 1980-12-31 | Vehicle detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57113381A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021640A (en) * | 1983-07-15 | 1985-02-04 | Nippon Signal Co Ltd:The | Information transmitter |
| JPH02144257A (en) * | 1988-11-24 | 1990-06-04 | Nippon Signal Co Ltd:The | Vehicle detecting device |
| WO2000014888A1 (en) * | 1998-09-03 | 2000-03-16 | Hitachi, Ltd. | Method and device for receiving frequency-modulated signal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS558930A (en) * | 1978-06-30 | 1980-01-22 | Nippon Signal Co Ltd | Vehicle detection circuit |
-
1980
- 1980-12-31 JP JP55187503A patent/JPS57113381A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS558930A (en) * | 1978-06-30 | 1980-01-22 | Nippon Signal Co Ltd | Vehicle detection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021640A (en) * | 1983-07-15 | 1985-02-04 | Nippon Signal Co Ltd:The | Information transmitter |
| JPH02144257A (en) * | 1988-11-24 | 1990-06-04 | Nippon Signal Co Ltd:The | Vehicle detecting device |
| WO2000014888A1 (en) * | 1998-09-03 | 2000-03-16 | Hitachi, Ltd. | Method and device for receiving frequency-modulated signal |
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