Safety guard to a motor vehicle, which allows the opening of the motor vehicle by a person authorized to open the motor vehicle

摘要

Safety device on a motor vehicle. It comprises a transponder is stationary (2) installed on the motor vehicle for the generation of a code signal interrogation, a transponder portable unit (3) for receiving a signal of the identification code, as well as for the emission of a code signal, and a device (4) for the generation of a switching signal for the transponder stationary. The transponder is stationary, is associated with a comparator of the code signals (5) which, when the code signal of the response is consistent with a code signal is expected to be stored, delivers an unlocking signal. The authorized person carries with it the transponder portable. The device for the generation of a switching signal for the transponder comprises a stationary sensor of motion in the infrared with detector (7), which is placed in the region of the handle of the door to open.