Collision sensors are control signal inputs in airbag systems. Its function is that when a car collides, the intensity signal of the car collision is detected by the collision sensor, and the signal is input into the airbag computer, and the airbag computer determines whether to detonate the inflatable element to inflate the airbag according to the signal of the collision sensor.
Most of the collision sensors use the inertial mechanical switch structure, which is quite a control switch, and its operating condition depends on the acceleration of the car when it collides. According to the structure, it can be divided into two types: mechanical type and electronic type. The mechanical type includes roller type, roller type, and eccentric ball type.
Collision sensors are also known as airbag sensors, and according to their different uses, collision sensors are divided into trigger collision sensors and protective collision sensors. The trigger collision sensor, also known as the collision intensity sensor, is used to detect the acceleration change during the collision and transmit the collision signal to the airbag computer as the trigger signal of the airbag computer; The protective crash sensor, also known as the safety crash sensor, is connected in series with the trigger collision sensor to prevent the airbag from detonation.
According to the different structures, collision sensors can also be divided into electromechanical collision sensors, electronic collision sensors and mechanical collision sensors. The protective collision sensor generally chooses an electronic structure, and the trigger collision sensor generally chooses an electromechanical combination structure or a mechanical structure.
1. The electromechanical combined collision sensor uses mechanical movement to control the action of electrical contacts, and then controls the opening and blocking of the airbag circuit by the contact disconnection and closing.
2. Electronic collision sensors have no electrical contacts, and there are two commonly used types: resistance strain type and piezoelectric effect type.
3. Mechanical collision sensors are commonly mercury switch type, which uses the conductive characteristics of mercury to control the connection and interception of the airbag circuit.
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