JPS54108599A - Detecting method for kind of vehicle using microprocessor - Google Patents
Detecting method for kind of vehicle using microprocessorInfo
- Publication number
- JPS54108599A JPS54108599A JP1579078A JP1579078A JPS54108599A JP S54108599 A JPS54108599 A JP S54108599A JP 1579078 A JP1579078 A JP 1579078A JP 1579078 A JP1579078 A JP 1579078A JP S54108599 A JPS54108599 A JP S54108599A
- Authority
- JP
- Japan
- Prior art keywords
- road surface
- wave
- vehicle
- variation
- ultrasonic
- 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 detect accurately a vehicle under no influence of variation in ambient temperature by measuring the time from an ultrasonic transmission wave to its reflected reception wave by temperature-compensated clock pulses, and by discriminating it by a microprocessor.
CONSTITUTION: An ultrasonic signal from ultrasonic-wave generating device 101 is transmitted from transmitter-receiver 105 toward road surface L and a reflected wave from road surface L or vehicle CA is received by transmitter-receiver 105 again to be counted by external counter 110. Microprocessor 120 stores in RAM123 a reference time (updated constantly) of the reflection from road surface L, return time of a sound wave between vehicle-discrimination superior level H and road surface L, and allowable time for the variation of road surface L due to snow S, flickering, etc., and by using those, it is discriminated whether the output of counter 110 is for a reflected wave from road surface L or vehicle CA. Then, since the frequency of pulse generator 111 is varied by temperature detector 112 with ambient temperature, the variation in ultrasonic-wave speed due to the temperature variation is corrected, so that clock pulse for the time measurement will not cause any error detection.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1579078A JPS54108599A (en) | 1978-02-13 | 1978-02-13 | Detecting method for kind of vehicle using microprocessor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1579078A JPS54108599A (en) | 1978-02-13 | 1978-02-13 | Detecting method for kind of vehicle using microprocessor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54108599A true JPS54108599A (en) | 1979-08-25 |
Family
ID=11898622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1579078A Pending JPS54108599A (en) | 1978-02-13 | 1978-02-13 | Detecting method for kind of vehicle using microprocessor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54108599A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02151998A (en) * | 1988-12-02 | 1990-06-11 | Matsushita Electric Ind Co Ltd | Ultrasonic type vehicle sensor for color district |
| US8055932B2 (en) * | 2002-09-16 | 2011-11-08 | Silicon Laboratories Inc. | Precision oscillator for an asynchronous transmission system |
| JP2021039632A (en) * | 2019-09-05 | 2021-03-11 | コイト電工株式会社 | Vehicle detector |
-
1978
- 1978-02-13 JP JP1579078A patent/JPS54108599A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02151998A (en) * | 1988-12-02 | 1990-06-11 | Matsushita Electric Ind Co Ltd | Ultrasonic type vehicle sensor for color district |
| US8055932B2 (en) * | 2002-09-16 | 2011-11-08 | Silicon Laboratories Inc. | Precision oscillator for an asynchronous transmission system |
| US8307237B2 (en) | 2002-09-16 | 2012-11-06 | Silicon Laboratories Inc | Precision oscillator for an asynchronous transmission system |
| JP2021039632A (en) * | 2019-09-05 | 2021-03-11 | コイト電工株式会社 | Vehicle detector |
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