Vehicle occupant characterization method based on the power spectrum of a seat sensor output signal
First Claim
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1. A method of characterizing an occupant of a vehicle seat, comprising the steps of:
- sampling an output signal of a sensor affixed to said seat to construct a digital occupant characterization signal;
calculating a power spectrum function of said occupant characterization signal;
integrating said power spectrum function over a specified frequency range to form an integration value;
retrieving a calibrated threshold based on measure of vehicle speed; and
comparing said integration value to said calibrated threshold;
characterizing said occupant as a cinched child seat when said integration value is above said threshold; and
characterizing said occupant as a normally seated adult when said integration value is below said threshold.
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Abstract
The occupant of a vehicle seat is characterized by computing a power spectrum function of data obtained from a seat sensor such as a pressure sensor in a fluid-filled seat bladder or a frame-mounted vertical accelerometer. The spectrum function is integrated over a specified frequency range, and compared to a threshold value that is calibrated to compensate for vehicle speed related variability. The presence of a cinched child seat is indicated when the threshold is exceeded, and the presence of a normally seated adult is indicated otherwise.
16 Citations
6 Claims
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1. A method of characterizing an occupant of a vehicle seat, comprising the steps of:
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sampling an output signal of a sensor affixed to said seat to construct a digital occupant characterization signal; calculating a power spectrum function of said occupant characterization signal; integrating said power spectrum function over a specified frequency range to form an integration value; retrieving a calibrated threshold based on measure of vehicle speed; and comparing said integration value to said calibrated threshold; characterizing said occupant as a cinched child seat when said integration value is above said threshold; and characterizing said occupant as a normally seated adult when said integration value is below said threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification