| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the accuracy and reliability of detection in a vehicle detection method for magnetically detecting vehicles by detecting a magnetic field generating from the vehicles with a magnetic sensor. SOLUTION: In or on the ground 14 whereon a vehicle 10 is passing in a width, a magnetic sensor 12 is arranged. The magnetic sensor 12 includes two or three magnetic detection elements having magnetic detection sensitivity in the longitudinal X-axis direction of the vehicle, the Z-direction vertical to the ground and Y-direction of the width of the vehicle. With these magnetic sensors, the intensity change of exterior magnetic field in two of X-axis and Z-axis directions or three directions by addition of the Y-axis direction is measured. From the base state without vehicles, detection of a vehicle is clone whether the sum of the absolute values of the intensity change in the exterior magnetic field in the two or three directions exceeds a prescribed threshold value.</p> |
