Emergency vehicle warning system
First Claim
1. A method of warning a driver within a first vehicle of an emergency vehicle proximate said first vehicle, the method comprising the steps:
- generating a Vehicle Present Signal from outside the first vehicle;
receiving said Vehicle Present Signal by a receiver within said first vehicle;
determining, from the Vehicle Present Signal, a distance between said emergency vehicle and said first vehicle;
activating a warning system within the first vehicle to an on-state if the distance is less than or equal to a first predetermined distance; and
,governing the warning system by a governing circuit that includes a dead band defined by upper and lower limits respectively corresponding to the first predetermined distance and a second predetermined distance greater than the first predetermined distance, the step of governing the warning system including the step of preventing the warning system from cycling from the on-state to an off-state when a distance between the first vehicle and the emergency vehicle transitions from a distance less than or equal to the first predetermined distance to a distance within the dead band greater than the first predetermined distance.
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Accused Products
Abstract
An emergency vehicle transmits a Vehicle Present Signal when in transit on public roads responding to an emergency. The signal can include information relating to the type of emergency vehicle, local highway and terrain data, and the location, speed and direction of travel of the emergency vehicle. When the Vehicle Present Signal is detected by a first vehicle, a functional circuit within the first vehicle calculates the distance between the emergency vehicle and the first vehicle. If the vehicles are within a predetermined distance, a warning signal activates one or more warning systems, thereby notifying the driver of the first vehicle that an emergency vehicle is in the vicinity. A dead-band defined by first and second predetermined distances can be incorporated to prevent rapid cycling of the warning signal.
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Citations
32 Claims
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1. A method of warning a driver within a first vehicle of an emergency vehicle proximate said first vehicle, the method comprising the steps:
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generating a Vehicle Present Signal from outside the first vehicle; receiving said Vehicle Present Signal by a receiver within said first vehicle; determining, from the Vehicle Present Signal, a distance between said emergency vehicle and said first vehicle; activating a warning system within the first vehicle to an on-state if the distance is less than or equal to a first predetermined distance; and
,governing the warning system by a governing circuit that includes a dead band defined by upper and lower limits respectively corresponding to the first predetermined distance and a second predetermined distance greater than the first predetermined distance, the step of governing the warning system including the step of preventing the warning system from cycling from the on-state to an off-state when a distance between the first vehicle and the emergency vehicle transitions from a distance less than or equal to the first predetermined distance to a distance within the dead band greater than the first predetermined distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for warning a driver controlling a first vehicle of an emergency vehicle proximate said first vehicle, said apparatus comprising:
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a) a signal-generator located outside the first vehicle for generating a Vehicle Present Signal; b) a signal-receiver coupled to said first vehicle for receiving said Vehicle Present Signal; c) a warning device within the first vehicle, said warning device configured to transition between on and off states; and
,d) a functional circuit coupled to said signal-receiver, including a range-finder for determining a distance from said first vehicle to said emergency vehicle, the functional circuit further comprising a control circuit for controlling the warning device, the control circuit including a dead band having a lower limit corresponding to a first predetermined distance between the first vehicle and the emergency vehicle, and an upper limit corresponding to a second predetermined distance between the first vehicle and the emergency vehicle, the second predetermined distance being greater than the first predetermined distance, said control circuit being configured to cycle said warning device from an off-state to an on-state when a distance between the emergency vehicle and the first vehicle transitions from a distance greater than the first predetermined distance to a distance less than or equal to the first predetermined distance. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification