JPS55166072A - Method of correcting sensing area of automotive looped sensor - Google Patents
Method of correcting sensing area of automotive looped sensorInfo
- Publication number
- JPS55166072A JPS55166072A JP7342779A JP7342779A JPS55166072A JP S55166072 A JPS55166072 A JP S55166072A JP 7342779 A JP7342779 A JP 7342779A JP 7342779 A JP7342779 A JP 7342779A JP S55166072 A JPS55166072 A JP S55166072A
- Authority
- JP
- Japan
- Prior art keywords
- loop coil
- inductance
- frequency
- increase
- tuned oscillator
- 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.)
- Granted
Links
Abstract
PURPOSE: To retain the sensitivity of an atomotive looped sensor constantly by employing the inductance of a loop coil laid on a road as the element of a resonator circuit of a tuned oscillator or providing to enable connection of a variable coil in parallel with the loop coil.
CONSTITUTION: When a vehicle exists on a detecting loop coil 1, its inductance L0 is reduced to increase the frequency of a tuned oscillator 5. Then, N-times multiplying circuit 6 is provided to raise the resolution with the frequency f1 set to Nf1. In this manner, when the vehicle rises on the loop coil 1, the inductance L0 is abruptly reduced to increase the oscilating frequency f0 of the tuned oscillator 5 to f1 and to simultaneously increase the output of the multiplying circuit 6 from Nf0 to Nf1. This output is measured by a pulse number counter 7 during the sampling gate time T outputted from the sampling pulse generator 8, and the result is calculated by a calculator 11.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54073427A JPS60631B2 (en) | 1979-06-11 | 1979-06-11 | Loop sensitivity measuring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54073427A JPS60631B2 (en) | 1979-06-11 | 1979-06-11 | Loop sensitivity measuring device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55166072A true JPS55166072A (en) | 1980-12-24 |
JPS60631B2 JPS60631B2 (en) | 1985-01-09 |
Family
ID=13517924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54073427A Expired JPS60631B2 (en) | 1979-06-11 | 1979-06-11 | Loop sensitivity measuring device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60631B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6055283A (en) * | 1983-09-05 | 1985-03-30 | Sumitomo Electric Ind Ltd | Method for detecting car |
JPS63188591U (en) * | 1987-05-28 | 1988-12-02 | ||
CN106019895A (en) * | 2015-03-31 | 2016-10-12 | 京瓷办公信息系统株式会社 | Sensor device, toner concentration detection method, and image forming apparatus |
-
1979
- 1979-06-11 JP JP54073427A patent/JPS60631B2/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6055283A (en) * | 1983-09-05 | 1985-03-30 | Sumitomo Electric Ind Ltd | Method for detecting car |
JPS63188591U (en) * | 1987-05-28 | 1988-12-02 | ||
CN106019895A (en) * | 2015-03-31 | 2016-10-12 | 京瓷办公信息系统株式会社 | Sensor device, toner concentration detection method, and image forming apparatus |
JP2016191607A (en) * | 2015-03-31 | 2016-11-10 | 京セラドキュメントソリューションズ株式会社 | Sensor device |
CN106019895B (en) * | 2015-03-31 | 2019-09-24 | 京瓷办公信息系统株式会社 | Sensor device, toner concentration detection method and image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS60631B2 (en) | 1985-01-09 |
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