| 摘要 |
PURPOSE: A foreign substance detector of a tire is provided to inform an insertion of foreign substances to a driver by using an electromagnet induction principle. CONSTITUTION: In traveling a vehicle, a foreign substance detecting unit(10) is interlocked with a rotation of a tire. A direction of a magnetic field is changed by rotating a magnet. A current detecting unit detects a current amount in a lead wire. A signal converting unit(20) converts an analog signal of the current detecting unit to a digital signal. A control unit(30) memorizes the digital signal in a temporary data memorizing unit. In inserting foreign substances in the tire, the foreign substance detecting unit(10) changes the magnetic field. The current value is changed by changing an inducement electromotive force. The current detecting unit detects the changed current amount and the signal converting unit(20) converts an analog signal to a digital signal. The control unit(30) compares the signal with the memorized signal. The control unit(30) outputs an electric signal when the signal values are different. An alarming unit(40) outputs a warning signal by the signal from the control unit(30). Thereby, a driver recognizes the insertion of foreign substances in the tire.
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