Method for rollover detection for automotive vehicles with safety-related devices
First Claim
1. Process for rollover detection for automotive vehicles with safety-related devices wherein, by means of an angular rate signal (ω
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x) generated by a gyrosensor (1) in respect of a rotation around the longitudinal axis (X-axis) of the vehicle and by means of an initial position signal (α
0) generated by a sensor (2) stating the initial position of the transverse axis of the vehicle, the following process steps are performed;
a) calculation of the current inclination angle (α
curr,calc) according to
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Abstract
A method for rollover detection for automotive vehicles with safety-related devices, such as roll bars, (side) airbags and seat-belt tensioners involves the following steps and features. An angular rate of rotation (ωx) around the vehicle longitudinal axis is provided by the signal of a gyrosensor, and an initial position angle (α0) identifying the initial position of the vehicle transverse axis is determined from at least one sensor signal. An integral of the angular rate is added to the initial position angle. The absolute value of the resulting sum, which is proportional to the momentary inclination angle relative to the horizontal plane, is then compared to a trigger threshold that is a function of the angular rate and vehicle-specific parameters. A safety-related device is triggered if the absolute value of the resulting sum exceeds the trigger threshold.
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Citations
12 Claims
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1. Process for rollover detection for automotive vehicles with safety-related devices wherein, by means of an angular rate signal (ω
-
x) generated by a gyrosensor (1) in respect of a rotation around the longitudinal axis (X-axis) of the vehicle and by means of an initial position signal (α
0) generated by a sensor (2) stating the initial position of the transverse axis of the vehicle, the following process steps are performed;a) calculation of the current inclination angle (α
curr,calc) according to - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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x) generated by a gyrosensor (1) in respect of a rotation around the longitudinal axis (X-axis) of the vehicle and by means of an initial position signal (α
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12. A process for rollover detection in a motor vehicle equipped with a safety-related device, comprising the steps:
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a) providing an angular rate of rotation of the vehicle about a longitudinal axis of the vehicle, from a signal generated by a first gyrosensor;
b) providing an initial position angle defining an initial angular position of a transverse axis of the vehicle, from at least one signal generated by at least one second sensor;
c) calculating a current inclination angle as a sum of the initial position angle and a time integral of the angular rate;
d) providing a trigger threshold as a predetermined static tipping angle of the vehicle minus a product of a constant and the absolute value of the angular rate, wherein the constant is a settable vehicle-specific constant that is also a function of at least one of a vehicle condition of the vehicle and a crash sequence which the vehicle is undergoing;
e) comparing the absolute value of the current inclination angle with the trigger threshold; and
f) if the absolute value of the current inclination angle exceeds the trigger threshold, then generating a trigger signal that is indicative of the detection of a rollover condition of the vehicle and that is adapted to trigger the safety-related device.
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Specification