Inter-vehicle distance measuring system and apparatus measuring time difference between each detection time of same road surface condition
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United States of America Patent
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Jan 27, 2004
Grant Date -
N/A
app pub date -
Aug 25, 2000
filing date -
Aug 27, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An inter-vehicle distance measuring apparatus for measuring distance between a target vehicle ahead of a present vehicle following the target vehicle is disclosed, wherein the apparatus is not affected by weather conditions such as rainfall or snowfall. In the apparatus, the target vehicle transmits the first road-surface data, such as the roughness of the road surface, to the present vehicle. Also in the present vehicle, the second road-surface data such as the roughness is also detected, and both detected data are compared. In the present vehicle, the first and second road surface data having the maximum correlation are detected, and the time difference of each detection time of these data is calculated so as to calculate the inter-vehicle distance.
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