Method and device for recognizing a collision
First Claim
1. A method for recognizing a collision for a passenger protection system in a motor vehicle, the method which comprises:
- continuously analyzing a signal interval of an output signal of an acceleration or pressure sensor is with regard to frequencies contained therein;
first, dividing a frequency spectrum contained in the signal interval into a suitable number of frequency bands;
determining a partial signal energy present for each frequency band;
finding a relationship between the partial signal energy and a total energy of the signal interval being analyzed;
comparing relative activations of the various frequency bands thus obtained with predetermined threshold values (SW); and
determining whether or not a collision has occurred based on the comparison.
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Abstract
The invention relates to a method and to a device for recognizing a collision, especially a side impact, for passenger protection means in a motor vehicle. The invention describes a method, especially in the case of side impact events, which differentiates between non-trigger situations and must-trigger situations by evaluating the frequency spectrum of the output signal (a) of an acceleration or pressure sensor as comprehensively as possible. The advantages of the invention are: robustness in relation to modifications in the signal amplitudes and the invention requires no previous knowledge of possible resonance frequencies. Another advantage of the invention is that no frequencies of the output signal (a) are blocked or suppressed.
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Citations
17 Claims
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1. A method for recognizing a collision for a passenger protection system in a motor vehicle, the method which comprises:
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continuously analyzing a signal interval of an output signal of an acceleration or pressure sensor is with regard to frequencies contained therein; first, dividing a frequency spectrum contained in the signal interval into a suitable number of frequency bands; determining a partial signal energy present for each frequency band; finding a relationship between the partial signal energy and a total energy of the signal interval being analyzed; comparing relative activations of the various frequency bands thus obtained with predetermined threshold values (SW); and determining whether or not a collision has occurred based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification