Method and device for determining the roll angle for occupant protection devices
First Claim
Patent Images
1. A method for determining a roll angle for triggering an occupant protection device comprising:
- detecting, by a processor, a transverse acceleration (ay) and a vertical acceleration (az) of the vehicle; and
estimating, by the processor, the roll angle (α
) of the vehicle based on the detected transverse acceleration (ay) and the detected vertical acceleration (az);
wherein the estimating includes comparing the detected transverse acceleration (ay) to a first threshold value and comparing the detected vertical acceleration (az) to a second threshold value, the roll angle (α
) being estimated using a first approximation when the transverse acceleration (ay) is greater than the first threshold value and the vertical acceleration (az) is greater than the second threshold value, and the roll angle (α
) being estimated using a second approximation when at least one of the transverse acceleration (ay) is less than or equal to the first threshold value and the vertical acceleration (az) is less than or equal to the second threshold value, andwherein trigonometric functions for estimating the roll angle ({acute over (α
)}) are approximated by corresponding Taylor series expansions, a sine function of the roll angle ({acute over (α
)}) being approximated according to sin {acute over (α
)}≈
{acute over (α
)}+o(á
2) for the first and second approximations, a cosine function of the roll angle ({acute over (α
)}) being approximated according to cos {acute over (α
)}≈
1−
{acute over (α
)}2/2+o({acute over (α
)}4) for the first approximation and being approximated according to cos {acute over (α
)}≈
1+o({acute over (α
)}2) for the second approximation.
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Abstract
A method for determining the roll angle for occupant protection devices and a corresponding device are described. A transverse acceleration and a vertical acceleration of the vehicle are detected, and the roll angle of the vehicle is estimated based on the detected transverse acceleration and the detected vertical acceleration.
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Citations
8 Claims
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1. A method for determining a roll angle for triggering an occupant protection device comprising:
-
detecting, by a processor, a transverse acceleration (ay) and a vertical acceleration (az) of the vehicle; and estimating, by the processor, the roll angle (α
) of the vehicle based on the detected transverse acceleration (ay) and the detected vertical acceleration (az);wherein the estimating includes comparing the detected transverse acceleration (ay) to a first threshold value and comparing the detected vertical acceleration (az) to a second threshold value, the roll angle (α
) being estimated using a first approximation when the transverse acceleration (ay) is greater than the first threshold value and the vertical acceleration (az) is greater than the second threshold value, and the roll angle (α
) being estimated using a second approximation when at least one of the transverse acceleration (ay) is less than or equal to the first threshold value and the vertical acceleration (az) is less than or equal to the second threshold value, andwherein trigonometric functions for estimating the roll angle ({acute over (α
)}) are approximated by corresponding Taylor series expansions, a sine function of the roll angle ({acute over (α
)}) being approximated according to sin {acute over (α
)}≈
{acute over (α
)}+o(á
2) for the first and second approximations, a cosine function of the roll angle ({acute over (α
)}) being approximated according to cos {acute over (α
)}≈
1−
{acute over (α
)}2/2+o({acute over (α
)}4) for the first approximation and being approximated according to cos {acute over (α
)}≈
1+o({acute over (α
)}2) for the second approximation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for determining a roll angle for an occupant protection device, comprising:
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a first acceleration sensor adapted to detect a transverse acceleration (ay) of a vehicle; a second acceleration sensor adapted to detect a vertical acceleration (az) of the vehicle; and an analyzer unit adapted to estimate the roll angle (α
) of the vehicle based on the detected transverse acceleration (ay) and the detected vertical acceleration (az),wherein the analyzer unit is adapted to compare the transverse acceleration (ay) to a first threshold value and the vertical acceleration (az) to a second threshold value and, depending on results of the comparison, estimate the roll angle (α
) using a first approximation or using a second approximation, andwherein trigonometric functions for estimating the roll angle ({acute over (α
)}) are approximated by corresponding Taylor series expansions, a sine function of the roll angle ({acute over (α
)}) being approximated according to sin {acute over (α
)}≈
{acute over (α
)}+o(á
2) for the first and second approximations, a cosine function of the roll angle ({acute over (α
)}) being approximated according to cos {acute over (α
)}≈
1−
{acute over (α
)}2/2+o({acute over (α
)}4) for the first approximation and being approximated according to cos {acute over (α
)}≈
1+o({acute over (α
)}2) for the second approximation.
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Specification