Road Surface Condition Estimating Device and Method
First Claim
1. A road surface condition estimating device having a vehicle information acquisition unit which acquires behavioral information about behavior of plural vehicles collected during their travel, the collected information including information about positions, postures, and travel speeds of the vehicles, and an all vehicle trajectory database which stores trajectories of positions traveled by the vehicles, said road surface condition estimating device comprising:
- undulation estimating unit which estimates undulations on the trajectories of the positions traveled by the vehicles from the behavioral information about the vehicles; and
a rut estimating unit which estimates undulations of ruts relative to the trajectories of the vehicles from the trajectories of the positions traveled by the vehicles and from the behavioral information about the vehicles;
wherein undulations on the trajectory of each traveling vehicle found by the undulation estimating unit and undulations of ruts relative to the trajectory of the traveling vehicle found by the rut estimating unit are superimposed for each vehicle to find road surface conditions and the found conditions are delivered to the vehicles.
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Abstract
A road surface condition estimating device includes an undulation estimating portion for estimating undulations on the trajectory of a traveling vehicle from behavioral information about plural vehicles collected during travel of the vehicles, and a rut estimating portion for estimating undulations of ruts relative to the trajectories of the vehicles from the trajectories of traveling vehicles and from the behavioral information about the vehicles. The behavioral information includes information about positions, postures, and speeds of travel of the vehicles. Undulations on the trajectory of each traveling vehicle found by the undulation estimating portion and undulations of ruts relative to the trajectory of the traveling vehicle are superimposed for each vehicle to find road surface conditions, which are delivered to the vehicles.
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Citations
8 Claims
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1. A road surface condition estimating device having a vehicle information acquisition unit which acquires behavioral information about behavior of plural vehicles collected during their travel, the collected information including information about positions, postures, and travel speeds of the vehicles, and an all vehicle trajectory database which stores trajectories of positions traveled by the vehicles, said road surface condition estimating device comprising:
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undulation estimating unit which estimates undulations on the trajectories of the positions traveled by the vehicles from the behavioral information about the vehicles; and a rut estimating unit which estimates undulations of ruts relative to the trajectories of the vehicles from the trajectories of the positions traveled by the vehicles and from the behavioral information about the vehicles; wherein undulations on the trajectory of each traveling vehicle found by the undulation estimating unit and undulations of ruts relative to the trajectory of the traveling vehicle found by the rut estimating unit are superimposed for each vehicle to find road surface conditions and the found conditions are delivered to the vehicles. - View Dependent Claims (2, 3, 4)
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5. A method of estimating road surface conditions which obtains behavioral information about plural vehicles collected during travel of the vehicles, storing trajectories of positions traveled by the vehicles, and finding road surface conditions, said behavioral information including information about positions, postures, and travel speeds of the vehicles, said method comprising the steps of:
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estimating undulations on the trajectories of positions traveled by the vehicles from the behavioral information about the vehicles; estimating undulations of ruts relative to the trajectories of the vehicles from the trajectories of the positions traveled by the vehicles and from the behavioral information about the vehicles; and superimposing the undulations on the trajectories of the traveling vehicles and the undulations of the ruts relative to the trajectories of the traveling vehicle to find road surface conditions and distributing the road surface conditions to the vehicles. - View Dependent Claims (6, 7, 8)
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Specification