Vehicle rollover detection having variable sensitivity
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United States of America Patent
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Nov 25, 2003
Grant Date -
Aug 21, 2003
app pub date -
Feb 15, 2002
filing date -
Feb 15, 2002
priority date (Note) -
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Abstract
A vehicle rollover sensing apparatus and method are provided for detecting a rollover condition of the vehicle. The rollover sensing apparatus includes an angular rate sensor for sensing attitude rate of change of a vehicle and a lateral accelerometer for sensing lateral dynamics of the vehicle. The rollover sensing apparatus also has an integrator for integrating the sensed attitude rate of change signal over a variable time window and producing an attitude angle. The rollover sensing apparatus further includes deployment logic for comparing the attitude angle and attitude rate of change to a pair of variable threshold values with a gray-zone that varies based on time, and for deploying a vehicle overturn condition signal based on the comparison. Sensitivity of the deployment logic is adjusted as a function of the sensed lateral dynamics to enhance rollover deployment during certain driving events.
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