Detaching prevention method for vehicular electronic tags

The invention discloses a detaching prevention method for vehicular electronic tags. When in installation, a vehicular electronic tag is uniquely bound with a vehicle through a detaching preventer, wherein the vehicular electronic tag is installed at the vehicle. The detaching preventer is an integrated circuit of a fragile paper substrate. A chip connecting coil is arranged on the fragile paper substrate. After fragile paper is torn, the coil is broken and the circuit fails to operate. When the electronic tag is installed on the vehicle, the detaching preventer is also installed around the electronic tag, and the electronic tag and the detaching preventer mutually determine mutual verification codes by means of wireless communication. When collecting electronic toll, the vehicular electronic tag communicates with the detaching preventer first and allows for normal transaction after binding relation is confirmed. If the detaching preventer is broken, or the range between the detaching preventer and the electronic tag exceeds the set range and communication verification fails, the electronic tag is detached. By the method, such technical problems that the vehicular electronic tag is used or detached illegally and error prompts occur during using can be avoided effectively.