System and method of vehicle system control

1. A method comprising:

obtaining an off-board-based input speed of a vehicle system traveling along a curved segment of a first route, the off-board-based input speed obtained from data provided by an off-board device disposed off the vehicle system;

determining a heading of the vehicle system from the data provided by the off-board device;

calculating a curvature of the curved segment of the first route using the off-board-based input speed and the heading of the vehicle system while the vehicle system travels along the curved segment of the first route;

controlling an adhesion modifying device to alter adhesion between one or more wheels of the vehicle system and the curved segment of the first route using the curvature of the curved segment of the first route that is calculated from the off-board-based input speed;

wherein the method comprises at least one of: the adhesion modifying device being controlled, based at least in part on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed, to dispense a friction-modifying substance from an applicator device toward the first route; or deactivating the adhesion modifying device when the applicator device is oriented away from the first route based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

2. The method of claim 1 , wherein the curvature of the curved segment of the first route is calculated using a rate of change of the heading of the vehicle system with respect to a distance traveled by the vehicle system.

3. The method of claim 1 , further comprising changing an orientation of the applicator device to be directed toward the first route using the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

4. The method of claim 1 , wherein the vehicle system includes a steerable rail vehicle having one or more wheels configured to be turned at least one of right or left relative to a direction of travel of the vehicle system, and further comprising turning the one or more wheels of the steerable rail vehicle based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

5. The method of claim 1 , wherein the vehicle system includes a propulsion-generating vehicle having plural axles coupled to plural respective motors, and further comprising altering torques applied by the motors to the respective axles based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

6. A method comprising:

obtaining an off-board-based input speed of a vehicle system traveling along a curved segment of a first route, the off-board-based input speed obtained from data provided by an off-board device disposed off the vehicle system;

determining a heading of the vehicle system from the data provided by the off-board device; and

calculating a curvature of the curved segment of the first route using the off-board-based input speed and the heading of the vehicle system while the vehicle system travels along the curved segment of the first route;

wherein the vehicle system includes a lighting control system having one or more light devices configured to generate light and to be turned at least one of right or left relative to a direction of travel of the vehicle system, and further comprising turning the one or more light devices of the lighting control system based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

7. A method comprising:

obtaining an off-board-based input speed of a vehicle system traveling along a curved segment of a first route, the off-board-based input speed obtained from data provided by an off-board device disposed off the vehicle system;

determining a heading of the vehicle system from the data provided by the off-board device;

calculating a curvature of the curved segment of the first route using the off-board-based input speed and the heading of the vehicle system while the vehicle system travels along the curved segment of the first route; and

detecting movement of the vehicle system over a switch at an intersection between the first route and at least a second route based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

8. A vehicle control system comprising:

a vehicle controller configured to obtain an off-board-based input speed of a vehicle system traveling along a curved segment of a first route, the off-board-based input speed obtained from data provided by an off-board device disposed off the vehicle system, the vehicle controller also configured to determine a heading of the vehicle system from the data provided by the off-board device and calculate a curvature of the curved segment of the first route using the off-board-based input speed and the heading of the vehicle system while the vehicle system travels along the curved segment of the first route;

wherein the vehicle system includes a lighting control system having one or more light devices configured to generate light, and the vehicle controller is configured to at least one of: turn the one or more light devices of the lighting control system based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed; or detect movement of the vehicle system over a switch at an intersection between the first route and at least a second route based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

9. The vehicle control system of claim 8 , wherein the vehicle controller is configured to control an adhesion modifying device to alter adhesion between one or more wheels of the vehicle system and the curved segment of the first route based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

10. The vehicle control system of claim 8 , wherein the vehicle system includes a steerable rail vehicle having one or more wheels configured to be turned at least one of right or left relative to a direction of travel of the vehicle system, and wherein the vehicle controller is configured to turn the one or more wheels of the steerable rail vehicle based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

11. The vehicle control system of claim 8 , wherein the vehicle system includes a propulsion-generating vehicle having plural axles coupled to plural respective motors, and the vehicle controller is configured to alter torques applied by the motors to the respective axles based on the curvature of the curved segment of the first route that is calculated from the off-board-based input speed.

12. The vehicle control system of claim 8 , wherein the vehicle controller is configured to calculate the curvature of the curved segment using a rate of change of the heading of the vehicle system with respect to a distance traveled by the vehicle system.

13. A method comprising:

receiving positional data of a vehicle system onboard the vehicle system, the positional data representative of locations and headings of the vehicle system along a curved segment of a route;

calculating a curvature of the curved segment of the route using a rate of change in the headings of the vehicle system and a velocity of the vehicle system that is derived from the locations of the vehicle system along the curved segment of the route; and

modifying adhesion of one or more wheels of the vehicle system to the route based on a magnitude of the curvature of the curved segment of the route that is calculated.

14. The method of claim 13 , wherein the vehicle system is a rail vehicle system including a rail vehicle having wheels configured to turn at least one of left or right relative to a direction of travel of the rail vehicle system, and further comprising steering the wheels of the rail vehicle based on a magnitude of the curvature of the curved segment of the route.

15. A method comprising:

obtaining an off-board-based input speed of a vehicle system traveling along a route, the off-board-based input speed obtained from data provided by an off-board device disposed off the vehicle system;

determining a rotation speed of a first wheel of the vehicle system;

calculating an estimated diameter of the first wheel based on the off-board-based input speed and the rotation speed during travel of the vehicle system along the route; and

at least one of:

modifying an operator-measured reference diameter of the first wheel to match or be closer to the estimated diameter, wherein the operator-measured reference diameter is used to calculate an onboard-based speed of the vehicle system and the onboard-based speed of the vehicle system is used to control tractive effort generated by the vehicle system;

alerting an operator of the vehicle system to measure the operator-measured reference diameter responsive to the estimated diameter differing from the operator-measured reference diameter by at least a non-zero threshold distance;

alerting the operator of the vehicle system that an inflated pressure of the first wheel is decreasing;

alerting the operator of the vehicle system that the inflated pressure of the first wheel indicates an impending flat tire; or

alerting the operator of the vehicle system that the inflated pressure of the first wheel indicates that the first wheel is flat.

16. The method of claim 6 , wherein the curvature of the curved segment of the first route is calculated using a rate of change of the heading of the vehicle system with respect to a distance traveled by the vehicle system.

17. The method of claim 7 , wherein the curvature of the curved segment of the first route is calculated using a rate of change of the heading of the vehicle system with respect to a distance traveled by the vehicle system.