A vehicle-motion based vehicle theft detection device uses preexisting vehicle motion sensors in combination with an engine immobilizer system to detect and deter potential vehicle theft. Depending on whether or not a valid ignition key is in use, the engine immobilizer system sends signals to an electronic...http://www.google.de/patents/US6950011?utm_source=gb-gplus-sharePatent US6950011 - Vehicle theft detection device and method
