Model based method to assess road curvature effect on travel time and comfort for route planning
First Claim
1. A system for assessing road curvature in response to requests from one or more users, said system comprising:
- an interface operative to communicate with the one or more users, wherein the interface receives the requests from the one or more users;
a path generator operative to generate a first path between a first point and a second point in response to a path request, wherein the first path includes a plurality of waypoints;
a road curvature assessor operative to generate an optimal speed profile for a second path in response to an assessment request, wherein the optimal speed profile for the second path satisfies both acceleration constraints and speed constraints, wherein generating the optimal speed profile includes;
sweeping through the plurality of waypoints in a first direction to determine an along track acceleration profile, wherein the along track acceleration profile satisfies a negative acceleration constraint; and
,sweeping through the plurality of waypoints in a second direction to update the along track acceleration profile wherein the updated along track acceleration profile satisfies both a negative acceleration constraint and a positive acceleration constraint; and
,a controller operative to respond to each of the requests via the interface, wherein said controller selectively relays the requests to the path generator and/or the road curvature assessor, wherein said controller selectively relays paths from the path generator to the road curvature assessor;
wherein the controller is configured to provide one or more of;
notify a user in response to the comfort level being less than a predetermined level;
provide an indication of he comfort to the user in response to receiving the request;
generate a new path including a comfort level greater than a predetermined level in response to the comfort level of the path being less than the predetermined level; and
impose speed limits on a driver of a vehicle based on the optimal speed profile.
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Accused Products
Abstract
Methods and systems for assessing the effect of road curvature on the travel time and the comfort level of a path determined by a ground based route planning system. The methods and systems identify a path and determine an allowable speed profile of the path, wherein the allowable speed profile satisfies a cross track acceleration constraint. Thereafter, the methods and systems determine an optimal speed profile of the path, wherein the optimal speed profile satisfies both an along track acceleration constraint and a speed constraint. Using the optimal speed profile, the road curvature of a path may be factored into a determination of the traversal time of the path. Additionally, using the optimal speed profile, the road curvature of a path may be used to derive a comfort level of the path. The optimal speed profile may be further used to provide driver assistance.
5 Citations
10 Claims
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1. A system for assessing road curvature in response to requests from one or more users, said system comprising:
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an interface operative to communicate with the one or more users, wherein the interface receives the requests from the one or more users; a path generator operative to generate a first path between a first point and a second point in response to a path request, wherein the first path includes a plurality of waypoints; a road curvature assessor operative to generate an optimal speed profile for a second path in response to an assessment request, wherein the optimal speed profile for the second path satisfies both acceleration constraints and speed constraints, wherein generating the optimal speed profile includes; sweeping through the plurality of waypoints in a first direction to determine an along track acceleration profile, wherein the along track acceleration profile satisfies a negative acceleration constraint; and
,sweeping through the plurality of waypoints in a second direction to update the along track acceleration profile wherein the updated along track acceleration profile satisfies both a negative acceleration constraint and a positive acceleration constraint; and
,a controller operative to respond to each of the requests via the interface, wherein said controller selectively relays the requests to the path generator and/or the road curvature assessor, wherein said controller selectively relays paths from the path generator to the road curvature assessor; wherein the controller is configured to provide one or more of; notify a user in response to the comfort level being less than a predetermined level; provide an indication of he comfort to the user in response to receiving the request; generate a new path including a comfort level greater than a predetermined level in response to the comfort level of the path being less than the predetermined level; and impose speed limits on a driver of a vehicle based on the optimal speed profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for assessing road curvature of a path, wherein said path includes a plurality of waypoints, wherein each of said plurality of waypoints includes a desired speed, said system comprising:
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an allowable speed module adapted to determine an allowable speed profile of the path, wherein said allowable speed profile includes an allowable speed for the each of the plurality of waypoints, wherein the allowable speed for the each of the plurality of waypoints satisfies a cross track acceleration constraint; and
,an optimal speed module adapted to determine an optimal speed profile of the path, wherein said optimal speed profile includes an optimal speed for the each of the plurality of waypoints, wherein the optimal speed for the each of the plurality of waypoints satisfies both an along track acceleration constraint and a speed constraint, wherein said speed constraint is a minimum of the desired speed and the allowable speed; wherein determining the optimal speed profile includes; sweeping through the plurality of waypoints in a first direction to determine an along track acceleration profile wherein the along track acceleration profile satisfies a negative acceleration constraint; and
,sweeping through the plurality of waypoints in a second direction to update the along track acceleration profile wherein the updated along track acceleration profile satisfies both a negative acceleration constraint and a positive acceleration constraint; and wherein the controller is configured to provide one or more of; notify a user in response to the comfort level being less than a predetermined level; provide an indication of the comfort level to the user in response to receiving the request; generate a new path including a comfort level greater than a predetermined level in response to the comfort level of the path being less than the predetermined level; and impose speed limits on a driver of a vehicle based on the optimal speed profile.
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Specification