JPS56157860A - Measuring method for running speed of vehicle - Google Patents

Measuring method for running speed of vehicle

Info

Publication number
JPS56157860A
JPS56157860A JP6143580A JP6143580A JPS56157860A JP S56157860 A JPS56157860 A JP S56157860A JP 6143580 A JP6143580 A JP 6143580A JP 6143580 A JP6143580 A JP 6143580A JP S56157860 A JPS56157860 A JP S56157860A
Authority
JP
Japan
Prior art keywords
output
vehicle
coil
running speed
sensor
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
Application number
JP6143580A
Other languages
Japanese (ja)
Inventor
Fumio Yamauchi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6143580A priority Critical patent/JPS56157860A/en
Publication of JPS56157860A publication Critical patent/JPS56157860A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G01P3/66—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE:To eliminate a change in sensitivity due to a car height and a speed, by a method wherein, in a method to measure a running speed through sensing of a vehicle by means of sensors imbedded in a road surface at given intervals, a flux gate type magnetic field sensor and a magnet are employed. CONSTITUTION:A ring core 1 and a sensor coil 2 are rolled around a permalloy ring core 1, and an output of a low-frequency oscillator 4 is amplified at a device 5. So amplified output is supplied to a coil 3, and as a result, an output is produced from the coil 2 and is inputted to a phase detector 6 through a band-pass filter 5'. The other output of the oscillator 4 is multiplied 2 times by means of a frequency multiplier 7, and is inputted to the phase detector 6 via a phase shifter 8. A magnitude of a magnetic field can be meausured through the reading of the output of the detector 6 via a filter 9. A plural number of said sensors are imbedded in a road surface, and a running speed is obtained from a time difference through the detection of a magnet piece on a vehicle. The sensor has an enough sensitivity against even a vehicle having a height of over 500cm, and thereby a high-precise measurement can be performed.
JP6143580A 1980-05-09 1980-05-09 Measuring method for running speed of vehicle Pending JPS56157860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6143580A JPS56157860A (en) 1980-05-09 1980-05-09 Measuring method for running speed of vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6143580A JPS56157860A (en) 1980-05-09 1980-05-09 Measuring method for running speed of vehicle

Publications (1)

Publication Number Publication Date
JPS56157860A true JPS56157860A (en) 1981-12-05

Family

ID=13170980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6143580A Pending JPS56157860A (en) 1980-05-09 1980-05-09 Measuring method for running speed of vehicle

Country Status (1)

Country Link
JP (1) JPS56157860A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5029076A (en) * 1973-07-18 1975-03-24
JPS52138977A (en) * 1976-05-14 1977-11-19 Tokyo Aircraft Instr Co System for measuring vehicle speed

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5029076A (en) * 1973-07-18 1975-03-24
JPS52138977A (en) * 1976-05-14 1977-11-19 Tokyo Aircraft Instr Co System for measuring vehicle speed

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