| 摘要 |
The present invention relates to a disengagement detection device and method capable of detecting the disengagement of a wheel from a vehicle easily and reliably. A magnetic sensor 11 detects the magnetism naturally accumulated in a space inside a vehicle at or near a wheel mounted on the vehicle. A control unit 21 determines, for each prescribed interval, the average value of the output sensor data based on the magnetism detected with the magnetic sensor 11 , judges that the wheel disengaged from the vehicle when the average value of the sensor data fluctuates by a prescribed threshold value or more and thereafter stabilizes at a value that is not in a stationary state, and controls the output unit 13 so as to output a disengagement notification signal to the outside. The present invention may be employed in antitheft devices for car wheels.
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