ANTITHEFT SYSTEM AND ANTITHEFT CONTROL METHOD

摘要

An antitheft system comprises a plurality of speakers (1, 2, 3, 4) for detecting the impact that a vehicle gets, and a security ECU (10) executing a detection unit specifying processing for specifying a speaker which has detected generation of an impact at first, an impact location assuming processing for assuming that the window glass is subjected to the impact if the signal value from the specified speaker is above a predetermined threshold otherwise assuming that the body is subjected to the impact, and an impact location specifying processing for estimating the distance between the estimated speaker and the source of the impact by using an appropriate correction coefficient when the assumed impact position is the window glass and estimating the distance between the estimated speaker and the source of the impact by using an appropriate correction coefficient when the assumed impact position is the body, and specifying any one of the window glass, the body or other position as the impact position based on the estimated distance.