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The number of bags per vehicle has increased significantly, and today, cars with more than 10 airbags can be found. With the increasing number of airbags, the number of sensors also increased. Today it is common to have at least 3 mono axial acceleration sensors in the periphery of the car body and one bi-axial acceleration sensor in the ECU. To improve the performance and reaction time of the system, pressure sensors are also used to sense side impacts.
The interpretation of a pressure sensor signal is quicker than the signal of an accelerometer, but the mounting location of the pressure sensor is inside the door. Side impacts that don´t deform the door need acceleration sensors to be detected.
The market is driven by the increasing emphasis on vehicle safety, stringent regulations mandating the installation of airbags, and the growing demand for advanced safety features in vehicles. The market is also influenced by factors such as the global automotive production levels, technological advancements, and the adoption of advanced driver assistance systems (ADAS) and autonomous driving technologies.
Airbag electronic systems measure various sensor signals and control several different actuators in an effort to prevent passenger injuries in case of accidents. This paper describes the electronics needed in such an application (acceleration sensors, bus interfaces, uC, power supply, squib drivers, etc.) and the development of airbag systems as well as their increase of complexity over time.
Acceleration information is delivered via PAS, PSI5, or DSI busses by high-g acceleration sensors installed on vehicle corners and pressure sensors installed inside the doors.
This information is validated by the microcontroller vs. centrally located inertial sensors. Precisely sampled acceleration values are used to identify a crash situation, in which case the firing circuit is enabled and a firing signal is sent to deploy the airbags.
Building blocks like voltage regulators/power supplies and squib drivers have to provide the energy at the right time to ignite the airbag balloons mounted in the front and sides of the vehicle and tighten seat belts. Over time, new features have been added to the system – including rollover protection with airbag curtains, rear crash protection (whiplash prevention), and superior advanced crash detection algorithms to fire multi-stage airbags. All this functionality needs to be addressed by effective, safe, reliable, and cost-effective electronics.
The Global airbag electronics market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
By Geography
By Vehicle type
By Airbag Type
By Vehicle segment