The sensor structure consists of a housing (non-magnetic material), a magnetic material, an inertial body (non-magnetic material), a soft iron connected to the inertial body, a spring that supports and adjusts the displacement amplitude, and a permanent The magnet is composed of coils and leads wound on soft iron. When the sensor is subjected to collision acceleration, the inertial body generates reverse acceleration, resulting in a change in the magnetic flux passing through the coil, and a bell-shaped pulse signal is generated at both ends of the coil lead. When adjusting the spring stiffness, the width of the acceleration signal can be changed.
The signal discriminating circuit of the sensor consists of three parts: the signal amplitude discriminating circuit; the signal width discriminating circuit; the useful and useless signal discriminating circuit. By judging the collision signal in multiple directions, the collision signal obtained by the control device can be more comprehensive, and the ignition control sent out is more accurate, thereby ensuring that the airbag is deployed under necessary conditions.