GLASS BREAKAGE ALARM DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a glass breakage alarm device that accurately detects glass breakage, and suppresses false detection when a ball or the like hits.

SOLUTION: The glass breakage alarm device is provided with: a pressure detection means 1 for detecting a change in pressure in a vehicle cabin; a low frequency side first filter means 2 and a high frequency side second filter means 3 for filtering the pressure detection means 1; a comparison and determination means 4 for comparing and determining a plurality of output signals of the filter means 2 and 3, and for determining the glass breakage of the vehicle; and an alarm means 5 for issuing a warning. A large difference is generated between the plurality of output signals according as the glass breaks or not. Thus, it is possible to clearly detect glass breakage.

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