Design of Piezoelectric Transducer for Automobile Seat Belt Locking System

Abstract The seatbelt locking system is an important part in the automotive electronics domain. Seat belt should get locked when a sudden deceleration takes place. Seatbelt was designed for providing safety for the passengers but in the conventional seatbelt locking system ball and hinge arrangement is used while when the vehicle undergoes sudden deceleration the ball due to its inertia continuous to be in motion, while this movement it makes the hinge to get locked to the gear thus stopping the movement of seatbelt. It had the disadvantage that the seatbelt would lock permanently and detaching the seatbelt was not possible resulting in cutting the webbing, later the seatbelt locking system was designed based on the speed the seatbelt was moving, faster the rate of movement of seatbelt the seatbelt would get locked. Using the battery supply as source the electronic locking mechanism is also been used in locking it. Here in this project we are using a piezoelectric material and an insulating layer to design the seatbelt piezo sensor and use this electrical energy used in locking the seatbelt.