The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2024
Filed:
Mar. 27, 2018
Kyosan Electric Mfg. Co., Ltd., Kanagawa, JP;
Makoto Kaneko, Kanagawa, JP;
Youichi Murakami, Kanagawa, JP;
Katsunori Nakajima, Kanagawa, JP;
Yuichiro Nakayama, Osaka, JP;
KYOSAN ELECTRIC MFG. CO., LTD., Kanagawa, JP;
Abstract
Provided is a technique for detecting a vehicle type and a traveling direction of a vehicle by an electromagnetic induction sensor. A sensor unit (), which is an electromagnetic induction sensor, includes a transmission coil (TX), a first reception coil (RX), and a second reception coil (RX). A magnetic field of a vehicle () made of steel attracts a magnetic field emitted from the transmission coil (TX) (S). As the vehicle () approaches, a stateindicated by the broken line changes to a stateindicated by the dash-dot line (S). A reduction in induced voltage and a phase change occur with respect to the induced voltage when the first reception coil (RX) is in the magnetic field of state(when the vehicle is not detected) (S). The differential output signals of the second reception coil RXand the first reception coil RXchange according to the advancement of the vehicle and according to the unevenness of the vehicle bottom portionand the metal species (S). The trajectory image representing a differential output signal in rectangular coordinates of a reception level and a phase difference is different for each vehicle, so the vehicle type may be distinguished.