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Patent

Diagnostics for vehicle deformation sensor system

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TLDR
In this paper, a sensor system for detecting impacts to a vehicle, including diagnostics for monitoring the sensor system, is described, which includes one or more piezoelectric sensor assemblies.
Abstract
A sensor system for detecting impacts to a vehicle, including diagnostics for monitoring the sensor system. The sensor system includes one or more piezoelectric sensor assemblies (42), each including a coaxial piezoelectric cable (44) contained within a tube housing (54), which is mounted to a structural member of the vehicle. The sensor system may also include accelerometers (36, 38) that are also in communication with the restraints control module (40) and employed in combination with one or more piezoelectric sensor assemblies (42). Further, the sensor system includes diagnostics for monitoring one or more of the sensor assemblies (42) in order to detect a sensor failure, while not interfering with the impact signals from the sensor assemblies (42).

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References
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Patent

Apparatus and method for monitoring vehicular impacts using magnetostrictive sensors

TL;DR: The magnetostrictive sensors are structurally simple and mounted to integral elements of the vehicle by adhesive or mechanical attachment as discussed by the authors, which provides the opportunity to recognize and react to impact conditions within a significantly reduced time-frame.
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Control unit with an air pressure detector for a vehicle passenger protection system

TL;DR: In this article, a control assembly for a passenger protection system of a vehicle which is tripped upon the occurrence of a side impact traffic accident is described, where the control assembly has at least one detector adapted to detect a pressure rise in a hollow body.
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Electric signalling in a supplemental passenger restraint system

TL;DR: In this article, a horn or other electrical sccessory is actuated by a flexible, pressure sensitive electric signal generating means such as a piezoelectric element, provided in the soft, flexible cover of a vehicle driver's side supplemental restraint system.
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TL;DR: An acoustic emission automotive crash sensor arrangement which includes a continuous loop type wave guide welded at a number of locations to the vehicle structures likely to be deformed upon impact of the vehicle with an object is described in this article.
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TL;DR: In this article, the authors proposed a monitoring algorithm that can correctly distinguish normal from abnormal vibration using automatically selected monitoring features and algorithms, which can be used with a variety of devices with different vibration characteristics.