Estimation apparatus for water film thickness on road surface
An estimation apparatus for a water film thickness on a road surface includes a data acquisition unit and an estimation unit. The data acquisition unit sequentially acquires a data set including driving force data representing a driving force output from a driving source of a vehicle and acceleration data representing a longitudinal acceleration of the vehicle, while the vehicle is traveling. The estimation unit estimates a thickness of a water film on a road surface on which the vehicle travels, based on a relationship between a speed of the vehicle and a fluid resistance that the vehicle receives from the water film, the flow resistance being calculated based on the data set.
1 . An estimation apparatus for a water film thickness on a road surface, the apparatus comprising:
a data acquisition unit that sequentially acquires a data set including driving force data representing a driving force output from a driving source of a vehicle and acceleration data representing a longitudinal acceleration of the vehicle, while the vehicle is traveling:
an estimation unit that estimates a thickness of a water film on a road surface on which the vehicle travels, based on the data set,
wherein the estimation unit estimates the thickness of the water film based on a relationship between a speed of the vehicle and a fluid resistance that the vehicle receives from the water film, the flow resistance being calculated based on the data set.
2 . The estimation apparatus for a water film thickness on a road surface according to claim 1 , wherein the estimation unit estimates the thickness of the water film based on a gradient of a regression line between a square of the speed of the vehicle and the fluid resistance.
3 . The estimation apparatus for a water film thickness on a road surface according to claim 2 , wherein the estimation unit estimates the thickness of the water film based on the data set during a time period in which the speed of the vehicle is equal to or higher than a predetermined speed or the speed of the vehicle is higher than a predetermined speed.
4 . The estimation apparatus for a water film thickness on a road surface according to claim 2 , wherein the data acquisition unit acquires wheel speed data representing a wheel speed of a wheel of the vehicle.
5 . The estimation apparatus for a water film thickness on a road surface according to claim 1 , wherein the estimation unit estimates the thickness of the water film based on the data set during a time period in which the speed of the vehicle is equal to or higher than a predetermined speed or the speed of the vehicle is higher than a predetermined speed.
6 . The estimation apparatus for a water film thickness on a road surface according to claim 5 , wherein the data acquisition unit acquires wheel speed data representing a wheel speed of a wheel of the vehicle.
7 . The estimation apparatus for a water film thickness on a road surface according to claim 1 , wherein the data acquisition unit acquires wheel speed data representing a wheel speed of a wheel of the vehicle.
8 . A water film thickness estimation method executed by one or a plurality of computers, the method comprising:
sequentially acquiring a data set including driving force data representing a driving force output from a driving source of a vehicle and acceleration data representing a longitudinal acceleration of the vehicle, while the vehicle is traveling; and
estimating a thickness of a water film on a road surface on which the vehicle travels, based on the data set,
wherein the estimating includes calculating a fluid resistance that the vehicle receives from the water film based on the data set, and estimating the thickness of the water film based on a relationship between the calculated fluid resistance and a speed of the vehicle.
9 . The water film thickness estimation method according to claim 8 , wherein the estimating includes estimating the thickness of the water film based on a gradient of a regression line between a square of the speed of the vehicle and the fluid resistance.
10 . The water film thickness estimation method according to claim 9 , wherein the estimating includes estimating the thickness of the water film based on the data set during a time period in which the speed of the vehicle is equal to or higher than a predetermined speed or the speed of the vehicle is higher than a predetermined speed.
11 . The water film thickness estimation method according to claim 9 , wherein the acquiring includes acquiring wheel speed data representing a wheel speed of a wheel of the vehicle.
12 . The water film thickness estimation method according to claim 8 , wherein the estimating includes estimating the thickness of the water film based on the data set during a time period in which the speed of the vehicle is equal to or higher than a predetermined speed or the speed of the vehicle is higher than a predetermined speed.
13 . The water film thickness estimation method according to claim 12 , wherein the acquiring includes acquiring wheel speed data representing a wheel speed of a wheel of the vehicle.
14 . The water film thickness estimation method according to claim 8 , wherein the acquiring includes acquiring wheel speed data representing a wheel speed of a wheel of the vehicle.
15 . A non-transitory computer-readable medium storing a program for estimating a water film thickness, the program causing one or a plurality of computers to execute:
sequentially acquiring a data set including driving force data representing a driving force output from a driving source of a vehicle and acceleration data representing a longitudinal acceleration of the vehicle, while the vehicle is traveling; and
estimating a thickness of a water film on a road surface on which the vehicle travels, based on the data set,
wherein the estimating includes calculating a fluid resistance that the vehicle receives from the water film based on the data set, and estimating the thickness of the water film based on a relationship between the calculated fluid resistance and a speed of the vehicle.