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Supplemental Inflatable Restraint (SIR) systems, or airbags, are becoming standard equipment on many passenger cars and light duty trucks and are, therefore, being applied in a wide range of vehicles in large volumes. This paper reviews the basic differences between single point sensing and multi-point sensing systems. It then discusses sensing-related considerations relevant to the design of a single point sensing system. This paper also discusses the importance of modeling and simulation in developing SIR sensing algorithms and evaluating their performance. The paper concludes by explaining why timely pole crash detection can be a passenger compartment sensing challenge.

Supplemental Inflatable Restraints (SIR) systems, or air bags, are being used in a wider variety of applications and in increased volumes. New technologies are becoming available for high volume SIR applications which may reduce SIR system cost, improve system reliability and improve SIR system performance. One is using a solid state accelerometer instead of mechanical crash sensors. This paper will first review the major differences between mechanical sensor based and accelerometer based SIR systems. It will then discuss some of the wide variety of issues and considerations that need to be addressed when designing or introducing an accelerometer based SIR system.