Törmäysanturi

Törmäysanturi, also known as a crash sensor, is a device used to detect sudden impacts or decelerations. These sensors are crucial components in many safety systems, particularly in automotive applications where they play a vital role in the deployment of airbags.

The fundamental principle behind most törmäysanturit is the measurement of acceleration. When a vehicle experiences a rapid change in velocity, such as in a collision, the sensor detects this sudden acceleration or deceleration. This detection can be achieved through various mechanisms, including mechanical switches, piezoelectric sensors, or accelerometers. Mechanical sensors often utilize a mass that is displaced by the impact, closing a circuit. Piezoelectric sensors generate an electrical charge proportional to the applied force, while accelerometers use micro-machined structures to measure inertial forces.

Upon detecting a significant impact, the törmäysanturi sends a signal to a control unit. This control unit, often part of the airbag system, processes the information from the sensor. If the detected impact meets predefined thresholds for severity and direction, the control unit initiates the deployment of airbags and other safety restraints, such as seatbelt pretensioners.

Beyond automotive safety, törmäysanturit can be found in other applications where impact detection is necessary. This includes industrial machinery for safety shutdowns, protective equipment for athletes, and even in some consumer electronics to protect sensitive components from damage. The specific design and sensitivity of a törmäysanturi are tailored to its intended application.