US 12,422,860 B2
Magnetic marker system and magnetic marker system designing method
Michiharu Yamamoto, Tokai (JP); Tomohiko Nagao, Tokai (JP); and Hitoshi Aoyama, Tokai (JP)
Assigned to AICHI STEEL CORPORATION, Tokai (JP)
Appl. No. 18/284,878
Filed by Aichi Steel Corporation, Tokai (JP)
PCT Filed Mar. 23, 2022, PCT No. PCT/JP2022/013690
§ 371(c)(1), (2) Date Sep. 29, 2023,
PCT Pub. No. WO2022/210203, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 2021-062795 (JP), filed on Apr. 1, 2021.
Prior Publication US 2024/0183118 A1, Jun. 6, 2024
Int. Cl. G05D 1/244 (2024.01); E01F 9/30 (2016.01); H01F 7/02 (2006.01); G05D 105/28 (2024.01)
CPC G05D 1/244 (2024.01) [E01F 9/30 (2016.02); H01F 7/0205 (2013.01); G05D 2105/28 (2024.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic marker system in which a magnetic marker as an individual-piece magnet or a columnar-shaped magnet is laid on or in a road surface forming a surface of a traveling road so as to be able to be detected by a vehicle including a magnetic sensor, with an attachment height of the magnetic sensor with reference to the road surface varying depending on a type of the vehicle, wherein
a specification of the magnetic marker as the individual-piece magnet is set based on a degree of approximation between
a first distribution representing a distribution of strengths of magnetism in a radial direction of the magnetic marker acting on a position at a minimum attachment height in a range of attachment heights of the magnetic sensor assumed in respective vehicles and
a second distribution representing a distribution of strengths of magnetism in a direction equivalent to the radial direction of the magnetic marker acting on the position at the minimum attachment height when the magnetic marker as a magnetism generation source is replaced by a magnetic dipole.