Collision record apparatus, collision state estimation method, and record medium
First Claim
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1. A collision record apparatus comprising:
- means for judging that a collision waveform due to a collision of a mobile unit and a waveform derived from the collision waveform reach predetermined thresholds, respectively; and
means for recording times, at which the collision waveform and the waveform derived therefrom reach the predetermined thresholds, in memory in association with waveform types.
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Abstract
A collision recording apparatus records times in a memory, when a collision waveform provided accompanying a collision of a mobile unit and a waveform derived from the collision waveform reach predetermined values. The collision recording apparatus also records waveform types in association with the times, respectively.
21 Citations
9 Claims
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1. A collision record apparatus comprising:
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means for judging that a collision waveform due to a collision of a mobile unit and a waveform derived from the collision waveform reach predetermined thresholds, respectively; and
means for recording times, at which the collision waveform and the waveform derived therefrom reach the predetermined thresholds, in memory in association with waveform types. - View Dependent Claims (2)
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3. A record medium recording information therein, the information comprising:
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times, at which a collision waveform provided accompanying a collision of a mobile unit and a waveform derived from the collision waveform reach predetermined values;
waveform types in association with the times.
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4. A collision estimation method comprising the steps of:
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starting time-counting based on a timing at which a collision waveform provided accompanying a collision exceeds a predetermined reference value;
calculating a time when a waveform derived from the collision waveform exceeds a predetermined threshold value for the waveform based on the counted time;
recording the calculated time in a record medium in association with waveform types;
reading the time recorded on the record medium for each waveform type as required;
comparing the read contents with provided experimental measurement data; and
estimating a situation when the collision occurring.
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5. A collision record apparatus comprising:
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an acceleration sensor for measuring an acceleration signal of a mobile unit upon a collision occurring;
a trigger circuit for outputting a trigger signal according to the acceleration signal received from acceleration sensor;
a threshold circuit for outputting a threshold value in response to reception of the trigger signal;
a judgment circuit for outputting an judgment signal upon exceeding the threshold value;
a timer for counting a time period from the output of the trigger signal to the output of the judgment signal; and
a memory for recording the judgment signal and the time. - View Dependent Claims (6, 7, 8, 9)
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Specification