Control system for work vehicle, method, and work vehicle

1. A control system for a work vehicle including a work implement, the control system comprising:

a controller configured to

acquire current terrain data indicating a current terrain;

determine a target design terrain indicating a target trajectory of the work implement, at least a part of the target design terrain being located above the current terrain;

operate the work implement to dump material on the current terrain sequentially from a nearer side to a farther side of the work vehicle in accordance with the target design terrain;

update the current terrain data; and

determine a next target design terrain at least partially above the updated current terrain.

2. The control system for the work vehicle according to claim 1 , wherein

the controller is further configured to control the work implement to dump the material on the current terrain while advancing the work vehicle on the dumped material.

3. The control system for the work vehicle according to claim 1 , wherein

the target design surface includes an inclined surface that extends forward and upward from a predetermined start position, and the inclined surface is inclined at a predetermined inclination angle with respect to a horizontal direction.

4. The control system for the work vehicle according to claim 3 , wherein

the controller is further configured to start dumping the material from the start position.

5. The control system for the work vehicle according to claim 3 , wherein

the target design terrain further includes a horizontal surface located in front of the inclined surface.

6. The control system for the work vehicle according to claim 3 , wherein

the inclination angle is greater than 0 degree and equal to or less than 15 degrees.

7. The control system for the work vehicle according to claim 1 , further comprising:

a sensor configured to output a signal indicating a position of an edge of the dumped material,

the controller being further configured to

acquire an edge position of the dumped material from the signal from the sensor,

determine a reverse position from the edge position,

advance the work vehicle toward the reverse position, and

switch from forward to reverse at the reverse position.

8. A method performed by a controller for controlling a work vehicle including a work implement, the method comprising:

determining a target design terrain indicating a target trajectory of the work implement, at least a part of the target design terrain being located above a current terrain;

operating the work implement to dump material on the current terrain sequentially from a nearer side to a farther side of the work vehicle according to the target design terrain;

advancing the work vehicle while operating the work implement according to the target design terrain in a nth dumping work, n being a positive integer;

determining a nth reverse position in the nth dumping work; and

switching the work vehicle from forward to reverse at the nth reverse position,

a (n+1)th reverse position in a (n+1)th dumping work being located in front of the nth reverse position.

9. The method according to claim 8 , further comprising:

controlling the work implement to dump the material on the current terrain while advancing the work vehicle on the dumped material.

10. The method according to claim 8 , wherein

the target design terrain extends forward and upward from a predetermined start position on the current terrain, and

a first reverse position in a first dumping work is the start position.

11. The method according to claim 8 , further comprising:

acquiring an edge position of the dumped material;

determining the nth reverse position from the edge position;

updating the edge position of the dumped material; and

determining the (n+1)th reverse position from the updated edge position.

12. The method according to claim 8 , wherein

the target design surface includes an inclined surface that extends forward and upward from a predetermined start position, and the inclined surface is inclined at a predetermined inclination angle with respect to a horizontal direction.

13. The method according to claim 12 , further comprising:

starting a dump of the material from the start position.

14. The method according to claim 12 , wherein

the target design terrain further includes a horizontal surface located in front of the inclined surface.

15. The method according to claim 12 , wherein

the inclination angle is greater than 0 degree and equal to or less than 15 degrees.

16. The method according to claim 8 , further comprising:

acquiring current terrain data indicating the current terrain;

updating the current terrain data after dumping material on the current terrain according to the target design terrain; and

determining a next target design terrain at least partially above the updated current terrain.

17. A work vehicle comprising:

a work implement; and

a controller that controls the work implement, the controller being configured to

acquire current terrain data indicating a current terrain,

determine a target design terrain indicating a target trajectory of the work implement, at least a part of the target design terrain being located above the current terrain,

operate the work implement to dump material on the current terrain sequentially from a nearer side to a farther side of the work vehicle in accordance with the target design terrain,

update the current terrain data, and

determine a next target design terrain at least partially above the updated current terrain.

18. The work vehicle according to claim 17 , wherein

the controller is further configured to control the work implement to dump the material on the current terrain while advancing the work vehicle on the dumped material.

19. The work vehicle according to claim 17 , wherein

the target design surface includes an inclined surface that extends forward and upward from a predetermined start position, and the inclined surface is inclined at a predetermined inclination angle with respect to a horizontal direction.