| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle detecting device selectively detecting a vehicle traveling on a targeted road. SOLUTION: This vehicle detecting device detecting the vehicle traveling on the road from a change in magnetism due to the vehicle is provided with two magnetic sensors 1a and 1b installed in two points in the longitudinal direction of the road, an arithmetic device calculating a difference signal V<SB>1</SB>-V<SB>2</SB>or a phase differenceΔt/t of the output signals V<SB>1</SB>and V<SB>2</SB>of the two magnetic sensors 1a and 1b, and a determination device 3 determining that the output signals V<SB>1</SB>and V<SB>2</SB>of the two magnetic sensors 1a and 1b express the magnetism change by the vehicle 4a traveling on the targeted road when the difference signal, its differential signal, or the phase difference exceeds preset threshold. COPYRIGHT: (C)2004,JPO
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