JPS55166072A - Method of correcting sensing area of automotive looped sensor - Google Patents

Method of correcting sensing area of automotive looped sensor

Info

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
Application number
JP7342779A
Other languages
Japanese (ja)
Other versions
JPS60631B2 (en
Inventor
Daiji Fujita
Takao Kadowaki
Tatsuo Kono
Tadashi Noguchi
Yoshiharu Yano
Kazuhiro Morizaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KENSETSUSHO DOBOKU KENKYU
KENSETSUSHO DOBOKU KENKYU SHOCHO
Panasonic Holdings Corp
Original Assignee
KENSETSUSHO DOBOKU KENKYU
KENSETSUSHO DOBOKU KENKYU SHOCHO
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KENSETSUSHO DOBOKU KENKYU, KENSETSUSHO DOBOKU KENKYU SHOCHO, Matsushita Electric Industrial Co Ltd filed Critical KENSETSUSHO DOBOKU KENKYU
Priority to JP54073427A priority Critical patent/JPS60631B2/en
Publication of JPS55166072A publication Critical patent/JPS55166072A/en
Publication of JPS60631B2 publication Critical patent/JPS60631B2/en
Expired legal-status Critical Current

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
JP54073427A 1979-06-11 1979-06-11 Loop sensitivity measuring device Expired JPS60631B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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