Fast Response Micro-Safing Sensor for Air Bag Systems

Paper #:
  • 1999-01-0758

Published:
  • 1999-03-01
Citation:
Mori, M., "Fast Response Micro-Safing Sensor for Air Bag Systems," SAE Technical Paper 1999-01-0758, 1999, https://doi.org/10.4271/1999-01-0758.
Pages:
6
Abstract:
To introduce a new micro-safing sensor for automotive applications with excellent characteristics based on silicon micro-machining techniques to prevent malfunctions in air bag systems using an acceleration switch. This sensor is composed of an upper electrode, cantilever, and pedestal formed by silicon micro-machining. The upper electrode and cantilever contact mechanically when acceleration during collision is applied and the β€œON” signal is output. To achieve a satisfactory result, we developed an optimal shape design using FEM simulation. Also, the frequency characteristic of 100Hz and threshold acceleration of 2-4 (G) are obtained by electrostatic force and chattering measure at the contact point. Other characteristics include high-speed response, compactness, and the fact it is inexpensive, making it highly suitable as a safing sensor for side air bag systems.
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