Configurable vehicular time to stop warning system
View Patent ↗A method is provided for determining when to issue an alert warning to a driver of a vehicle relating to an upcoming stopping location in a road of travel. Wireless messages transmitted from a remote entity to the vehicle are received. The messages contain information such as position data and other data affecting stopping of the vehicle. GPS data relating to instantaneous vehicle position in the road of travel is retrieved. A travel time until the vehicle reaches the stopping location is determined. A determination is made whether the driver has initiated braking. An advance notice period is determined for issuing a warning to the driver to decelerate the vehicle comprising the travel time plus a predetermined reaction time plus a selectable driver configured increment. A sensory warning to the driver of the vehicle is actuated if the advance notice period is less than the travel time and the driver has not initiated braking.
1. A method for determining when to issue an alert warning to a driver of a vehicle relating to an upcoming stopping location in a road of travel, the method comprising the steps of:
a receiver receiving a wireless message transmitted from a remote entity to the vehicle, the message containing position data for determining a distance to the stopping location in the traveled road;
a GPS receiver retrieving GPS data relating to instantaneous vehicle position in the road of travel;
determining an instantaneous vehicle speed;
determining a travel time until the vehicle reaches the stopping location via a controller;
detecting whether the driver has initiated braking;
determining an advance notice period via the controller for issuing a warning to the driver to decelerate the vehicle, the advance notice period comprising the travel time plus a predetermined reaction time plus a selectable driver configured increment, the selectable driver configured increment allowing the driver to selectively configure the advance notice period to modify a time to issue a warning to alert the driver of the vehicle to initiate deceleration of the vehicle;
wherein the advance notice period is represented by the following formula:
t
warning
_
earliest
=
t
warn
_
window
+
t
react
+
v
2
*
a
where t warn — window is the additional time added to the lead time to warn the driver, t react is is a typical reaction time of a driver reacting to a warning signal and initiating an action for decelerating of the vehicle; v is the speed of vehicle of the vehicle, and a is an average value for the deceleration of the vehicle;
wherein, in the absence of a selectable driver configured increment, the default value for t warn — window , is determined by the following formula:
t warn — window =r auto +( K rain +K ice +K light +K road −K war *N war )* T
where r auto is a default driver selectable setting, K rain is a weight factor for rain, K ice is a weight factor for ice, K light is a weight factor for ambient lighting conditions, K road is a weight factor for road grade conditions, K war is a weight factor for driving behavior, N war is a number of warnings-brake events within a past time window, and T is a predetermined time constant; and
actuating a sensory warning by a driver vehicle interface device to the driver of the vehicle when the advance notice period is less than the travel time and the driver has not initiated braking.
2. The method of claim 1 wherein the selectable driver configured increment further includes a plurality of settings each selectable by the driver to modify the time of the advance notice period to the driver.
3. The method of claim 2 wherein the selectable driver configured increment is set to the default setting in the absence of a driver selection.
4. The method of claim 2 wherein the default t warn — window value is modified, in the presence of a driver selection, based on the following formula:
t warn — window =r*T
where r is a driver number of the driver selectable setting, and T is a predetermined time constant.
5. The method of claim 2 wherein the plurality of setting includes an initial setting of zero, and wherein each setting after the initial setting increments the advance notice period by predetermined amount of time.
6. The method of claim 1 wherein the message contains data relating to a traffic light lane marking.
7. The method of claim 6 wherein the message further contains data relating to the time the traffic light turns red.
8. The method of claim 1 wherein the advance notice period further comprises increments corresponding to environmental conditions and driving behavior.
9. The method of claim 1 wherein the message transmitted by the remote entity is transmitted as an infrastructure-to-vehicle communication.
10. The method of claim 1 wherein the message transmitted by the remote entity is transmitted as a vehicle-to-vehicle communication.
11. The method of claim 1 wherein the message contains data relating to a stop sign lane marking.
12. The method of claim 1 wherein the message contains data relating to a rail crossing sign marking.
13. The method of claim 1 wherein the advance notice period is based on stopping the vehicle at a stop light signal lane marking.
14. The method of claim 1 wherein the advance notice period is based on stopping the vehicle at a stop signal marking.
15. The method of claim 1 wherein the advance notice period is based on stopping the vehicle at a stopped vehicle forward of the vehicle.
16. A vehicular warning system for alerting a driver of a vehicle of an upcoming stopping location in a road of travel, the system comprising:
a host vehicle receiver for receiving a remote wireless message from a remote entity transmitting unit for transmitting the wireless message, the wireless message including position data relating to a stopping location in the traveled road of the driven vehicle;
a GPS receiver for determining an instantaneous vehicle position in the traveled road;
a controller for determining a travel time to reach the stopping location in response to the remote wireless message data and the instantaneous vehicle position determined by the in-vehicle GPS, the controller determining an advance notice period for issuing a warning to the driver to initiate deceleration of the vehicle in response to travel time plus a predetermined reaction time plus a selectable driver configured increment, the controller further determining a braking status of the vehicle;
wherein the advance notice period is represented by a formula based on the following factors:
where t warn — window is the additional time added to the lead time to warn the driver, t react a typical reaction time of a driver reacting to a warning signal and initiating an action for decelerating of the vehicle, v is the speed of vehicle of the vehicle, and a is an average value for the deceleration of the vehicle;
wherein, in the absence of a selectable driver configured increment, the default value for t warn — window is determined by a formula based on the following factors:
where r auto is a default driver selectable setting, K rain is a weight factor for rain, K ice is a weight factor for ice, K light is a weight factor for ambient lighting conditions, K road is a weight factor for road grade conditions, K war is a weight factor for driving behavior, N war is a number of warnings-brake events within a past time window, and T is a predetermined time constant; and
a driver vehicle interface for actuating a sensory warning to the driver of the vehicle if the advance notice period is less than the travel time and the driver has not initiated braking.
17. The vehicle warning system of claim 16 wherein the wireless message further includes data relating to lane and intersection geometry data, weather information, road grade and road condition data, work zone information, traffic data, or accident risk information.
18. The vehicular warning system of claim 16 wherein the controller for determining a travel time is integrated as part of an automated cruise control configuration unit.
19. The vehicle warning system of claim 16 wherein the remote entity transmitter includes a vehicle-based transmitter.
20. The vehicle warning system of claim 16 wherein the remote entity transmitter includes a road side equipment infrastructure-based transmitter.