Ramp identification in adaptive cruise control
A control system 20 for an automotive vehicle 22 , such as an adaptive cruise control system, is provided including a navigation system 34 . The navigation system 34 includes a global positioning system 38 . The navigation system 34 detects a ramp and generates a navigation signal including navigation data and map data. A controller 24 is electrically coupled to the navigation system 34 . The controller 24 in response to the navigation signal adjusts the speed of the vehicle 22.
1. A method of adaptively controlling the speed of an automotive vehicle having a controller comprising:
detecting a ramp with the controller comprising;
determining a position of an exit ramp comprises;
examining road segment information for highway and ramp classifications;
searching road segment information for start node identification;
searching stored data for highway and ramp segment pairs that have identical start nodes; and
identifying an exit ramp in response to said identical start nodes;
establishing a heading component of said exit ramp;
determining that the automotive vehicle has changed lanes; and
determining that the automotive vehicle is on said exit ramp in response to said position, said heading component, and the automotive vehicle changing lanes;
establishing a heading component of said ramp comprising at least one of ramp curvature and ramp departure angle; and
adjusting the automotive vehicle speed, relative to a set speed, in response to said ramp and said heading component.
2. A method as in claim 1 wherein determining a position of an exit ramp comprises:
determining probable candidate positions;
selecting a best candidate position from said probable candidate positions;
determining a candidate position of said probable candidates positions is on an exit ramp; and
establishing the position of the automotive vehicle relative to the position of an exit ramp.
3. A method as in claim 2 wherein selecting a best candidate position comprises:
determining possible candidate positions using tools selected from the following group comprising: vehicle speed, yaw rate, GPS data, map data, navigation data, and a combination thereof;
assigning a probability to each possible candidate position; and
determining the possible candidate with the highest probability and labeling that candidate the best candidate.
4. A method as in claim 1 wherein establishing a heading component of said exit ramp comprises determining a direction of said exit ramp in relation to a road segment.
5. A method of adaptively controlling the speed of an automotive vehicle having a controller comprising:
detecting a ramp with the controller comprising;
determining a position of an exit ramp;
establishing a heading component of said exit ramp;
determining that the automotive vehicle has changed lanes; and
determining that the automotive vehicle is on said exit ramp in response to said position, said heading component, and the automotive vehicle changing lanes;
establishing a heading component of said ramp comprising at least one of ramp curvature and ramp departure angle;
adjusting the automotive vehicle speed, relative to a set speed, in response to said ramp and said heading component; and
inhibiting resume speed of the automotive vehicle, when the automotive vehicle is determined to be on an exit ramp or near an exit ramp, for a prescribed period of time.
6. A method of adaptively controlling the speed of a automotive vehicle having a controller comprising:
detecting an exit ramp;
determining a position of an exit ramp;
establishing a heading component of said exit ramp comprising at least one of ramp curvature and ramp departure angle;
determining the automotive vehicle has changed lanes;
determining that the automotive vehicle is on an exit ramp in response to the position of said exit ramp, said heading component, and the automotive vehicle changed lanes; and
inhibiting resume speed, relative to a set speed, of the automotive vehicle in response to detection of said exit ramp and said heading component.
7. A method of adaptively controlling the speed of an automotive vehicle having a controller comprising:
detecting a ramp with the controller;
determining a position of said ramp comprising;
examining road segment information for highway and ramp classifications;
searching road segment information for start node identification;
searching stored data for highway and ramp segment pairs that have identical start nodes; and
identifying an exit ramp in response to said identical start nodes;
determining that the automotive vehicle is on said ramp in response to said position; and
adjusting the automotive vehicle speed, relative to a set speed, in response to said ramp.
8. A method as in claim 7 further comprising:
establishing a heading component of said ramp;
determining that the automotive vehicle has changed lanes; and
determining that the automotive vehicle is on said ramp in response to said heading component and said lane change determination.