Method and device for automatically activating the alarm system, in particular for an automobile

摘要

The process relates to an alarm system, especially for motor vehicles, to protect it against intrusion and theft.; According to this method, is provided for each part or accessory to be protected, of the vehicle, an electric device for detecting an alarm condition (BE₂, BE₃, BE₄), connects these sensing devices to an alarm device (AL ) and supplies the electrical arrangement with energy from an energy source such as the vehicle battery. The method is characterized in that which is shaped at least some detection devices for each detected alarm condition causes a sudden change in current consumption at the terminals of the battery, detects these variations to these terminals (BE1 in) and using the electrical signals such sudden changes to trigger the alarm device (AL).