Vehicle collision alert system
First Claim
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1. An apparatus for determining an excessive speed approach of a vehicle to an object in front of said vehicle, comprising:
- a normalized time rate of change detector for determining a normalized time rate of change of a visual angle, (1/θ
)·
(dθ
/dt), for said object as viewed from said vehicle, the normalized time rate of change detector including means for measuring a distance D of said vehicle with respect to said object, means for measuring a relative speed Vr of said vehicle with respect to said object, and means for dividing the measured relative speed Vr by the measured distance D to calculate the normalized time rate; and
an indicator for producing an indication of the excessive speed approach based upon the normalized time rate, said indicator including means for producing a first alarm to indicate a recognition of an excessive approach of said vehicle to said object when the normalized time rate exceeds a first range of 6%±
1.1%, said first range corresponding to a driver'"'"'s recognition of an excessive approach of said vehicle, and for producing a second alarm indicating danger of a rear-end collision when the normalized time rate exceeds a second range of 12%±
2.2%, said second range corresponding to a driver'"'"'s recognition of danger of a rear-end collision.
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Abstract
An apparatus for deciding an excessive approach of a vehicle to an object in front of the vehicle. The excessive approach decision apparatus comprises a normalized time rate of change detector for determining a normalized time rate of change of a visual angle for the object as viewed from the vehicle. An excessive approach is indicated based upon the determined normalized time rate.
552 Citations
5 Claims
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1. An apparatus for determining an excessive speed approach of a vehicle to an object in front of said vehicle, comprising:
-
a normalized time rate of change detector for determining a normalized time rate of change of a visual angle, (1/θ
)·
(dθ
/dt), for said object as viewed from said vehicle, the normalized time rate of change detector including means for measuring a distance D of said vehicle with respect to said object, means for measuring a relative speed Vr of said vehicle with respect to said object, and means for dividing the measured relative speed Vr by the measured distance D to calculate the normalized time rate; andan indicator for producing an indication of the excessive speed approach based upon the normalized time rate, said indicator including means for producing a first alarm to indicate a recognition of an excessive approach of said vehicle to said object when the normalized time rate exceeds a first range of 6%±
1.1%, said first range corresponding to a driver'"'"'s recognition of an excessive approach of said vehicle, and for producing a second alarm indicating danger of a rear-end collision when the normalized time rate exceeds a second range of 12%±
2.2%, said second range corresponding to a driver'"'"'s recognition of danger of a rear-end collision. - View Dependent Claims (2, 3, 4, 5)
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Specification