Free flow electronic toll collection system 's coil detecting element

The utility model is suitable for an intelligent transportation free flow electronic toll collection system technical field provides a free flow electronic toll collection system's coil detecting element, including first coil, second coil, four coil and the tertiary winding that sets gradually, first coil set up in free flow electronic toll collection system import department, the tertiary winding sets up in barrier machine department, the second coil with four coil set up in first coil with between the tertiary winding. Can effectually avoid the vehicle hourglass of ultrashort automobile body to examine, motorcycle type such as smart, QQ for example. 本实用新型适用于智能交通自由流不停车收费系统技术领域，提供了种自由流不停车收费系统的线圈检测单元，包括依次设置的第线圈、第二线圈、第四线圈和第三线圈；所述第线圈设置于所述自由流不停车收费系统进口处，所述第三线圈设置于栏杆机处，所述第二线圈和所述第四线圈设置于所述第线圈和所述第三线圈之间。可以有效的避免超短车身的车辆漏检，例如smart、QQ等车型。