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
-
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
D) 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∫
ω
dt+α
start=α
curr,calc, with α
start=α
0
(1)b) generating a trigger threshold (S(ω
)) according toS(ω
)=α
tip−
k|ω
|,
(2)in which α
tip corresponds to the static tipping angle of the vehicle and k is a settable vehicle-specific constant which is also a function of the vehicle condition and/or the crash sequence, c) comparison of the value of the absolute amount of the calculated angle of inclination (α
curr,calc) with the value of the trigger threshold (S(ω
), and d) generation of a trigger signal for at least one safety-related device when the trigger threshold (S(ω
)) is exceeded according to|α
curr,cals|>
S(ω
).
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Abstract
Method for rollover detection for automotive vehicles with safety-related devices, such as roll bars, (side) airbags and seat-belt tensioners.
In a known method according to DE 196 09 717 A1, in which an angular rate sensor measures the angular velocity in each case around the vertical axis (yaw axis), the longitudinal axis and the transverse axis (pitch axis) of the vehicle, a rollover is detected when at least one of the measured angular velocities exceeds a defined threshold value (limit value). This publication further proposes calculating the rotational energy of the vehicle from the angular velocities, and indicating an impending rollover when the rotational energy exceeds a defined threshold. However, the disadvantage of this method is that false decisions cannot be excluded, when for example the vehicle is traveling over steep terrain or is subject to slow rolling motions while traveling around curves, especially into steep curves.
According to the invention, starting from the initial position angle indicating the initial position of the vehicle, the integrated angular rate signal—as angle of rotation—is added so that the value proportional to the momentary inclination angle (in relation to the horizontal plane) can be compared to a trigger threshold which is a function of the angular rate. A safety-related device is triggered if this trigger threshold is exceeded by the cumulative value.
34 Citations
11 Claims
-
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
D) 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∫
ω
dt+α
start=α
curr,calc, with α
start=α
0
(1)b) generating a trigger threshold (S(ω
)) according toS(ω
)=α
tip−
k|ω
|,
(2)in which α
tip corresponds to the static tipping angle of the vehicle and k is a settable vehicle-specific constant which is also a function of the vehicle condition and/or the crash sequence,c) comparison of the value of the absolute amount of the calculated angle of inclination (α
curr,calc) with the value of the trigger threshold (S(ω
), andd) generation of a trigger signal for at least one safety-related device when the trigger threshold (S(ω
)) is exceeded according to|α
curr,cals|>
S(ω
). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
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
Specification