Travel plan correction device and travel plan correction method

1. A travel plan correction device of a self-vehicle on which an autonomous driving control device performs travel control on the basis of a travel plan of the self-vehicle, comprising:

a processor to execute a program; and

a memory to store the program which, when executed by the processor, performs processes of,

acquiring a relative position of the self-vehicle with respect to a surrounding vehicle, travel control information of the surrounding vehicle, and the travel plan,

setting a risk calculation section which has a certain relative positional relation with a traveling spot in a case where the self-vehicle travels along the travel plan and includes the traveling spot,

calculating a travel risk value indicating a risk at the time when the self-vehicle travels each of a plurality of target areas within the risk calculation section including the traveling spot, on the basis of a relative position between the target area and the surrounding vehicle and the travel control information of the surrounding vehicle,

extracting a section whose travel risk value is lower than that at the traveling spot, out of the risk calculation section, as a risk reduction section,

correcting the travel plan so as to cause the self-vehicle to move to the risk reduction section,

correcting the travel plan so as to cause the self-vehicle to move to the risk reduction section even when there is a risk increase section whose travel risk value is higher than that at the traveling spot, between the traveling spot and the risk reduction section, and

calculating a movement recommendation value which is an index to be used to determine whether to move from the traveling spot to the risk reduction section,

wherein said travel plan correction device

determines whether to correct the travel plan so as to cause the self-vehicle to move to the risk reduction section, on the basis of the movement recommendation value, when the risk increase section is present between the traveling spot and the risk reduction section,

calculates, for each of all the risk reduction sections within the risk calculation section, a section movement recommendation value serving as an index to be used to determine whether to move to the risk reduction section through the risk increase section which is an immediately preceding section of the risk reduction section, and

sets an accumulated value obtained by accumulating the section movement recommendation values from the traveling spot to the risk reduction section as the movement recommendation value for the risk reduction section.

2. The travel plan correction device according to claim 1 , wherein the travel plan correction device sets the section movement recommendation value on the basis of an integration value of differences each between the travel risk value in the risk increase section which is an immediately preceding section of the risk reduction section and the travel risk value at the traveling spot.

3. The travel plan correction device according to claim 1 , wherein the travel plan correction device sets the section movement recommendation value on the basis of a maximum value of the travel risk value in the risk increase section which is an immediately preceding section of the risk reduction section.

4. The travel plan correction device according to claim 1 , wherein the travel plan correction device sets the section movement recommendation value on the basis of an integration value of differences each between the travel risk value at the traveling spot and the travel risk value in the risk reduction section.

5. The travel plan correction device according to claim 1 , wherein the travel plan correction device sets the section movement recommendation value on the basis of a minimum value of the travel risk value in the risk reduction section.

6. The travel plan correction device according to claim 1 , wherein the travel plan correction device sets the section movement recommendation value for the risk reduction section which is a calculation target of the movement recommendation value, on the basis of a value obtained by integrating a difference between the travel risk value at the traveling spot and the minimum value of the travel risk value in the risk reduction section which is the calculation target, with a distance or time for which the self-vehicle travels after the self-vehicle moves to a spot at which the travel risk value for the risk reduction section which is the calculation target becomes the minimum value.

7. The travel plan correction device according to claim 1 , wherein the travel control information of the surrounding vehicle includes control information on an steering actuator, a drive actuator, or a braking actuator of the surrounding vehicle.

8. The travel plan correction device according to claim 1 , wherein

the travel plan correction device acquires the relative position of the self-vehicle with respect to the surrounding vehicle on the basis of detection information of a sensor mounted on the self-vehicle, and

the travel plan correction device sets a range in which the surrounding vehicle whose relative position with respect to the self-vehicle is acquired by using the sensor mounted on the self-vehicle is present, as the risk calculation section.

9. The travel plan correction device according to claim 8 , wherein

the travel plan correction device acquires the relative position between the surrounding vehicle at a distant location which cannot be detected by the sensor and the self-vehicle by using traffic information, and

the travel plan correction device sets a range in which the surrounding vehicle whose relative position with respect to the self-vehicle is acquired by using the traffic information is present, as the risk calculation section.

10. The travel plan correction device according to claim 1 , wherein

the program, when executed by the processor, performs further processes of:

causing an output device in the self-vehicle to output information indicating whether the risk reduction section is present or not.

11. The travel plan correction device according to claim 10 , wherein the travel plan correction device causes the output device to output a graph indicating the risk values at the traveling spot and other areas in the risk calculation section.

12. The travel plan correction device according to claim 10 , wherein

the output device is a display device, and

when the travel plan correction device corrects the travel plan so as to cause the self-vehicle to move to the risk reduction section, a presentation image of a moving path of the self-vehicle to the risk reduction section according to the corrected travel plan is displayed on the display device.

13. The travel plan correction device according to claim 12 , wherein

the display device is a head up display, and

the travel plan correction device causes the head up display to display the travel control information of the surrounding vehicle while the travel control information of the surrounding vehicle is superimposed on a forward landscape of the self-vehicle.

14. A travel plan correction method of a self-vehicle on which an autonomous driving control device performs travel control on the basis of a travel plan of the self-vehicle, comprising:

acquiring a relative position of the self-vehicle with respect to a surrounding vehicle, travel control information of the surrounding vehicle, and the travel plan;

setting a risk calculation section which has a certain relative positional relation with a traveling spot in a case where the self-vehicle travels along the travel plan and includes the traveling spot;

calculating a travel risk value indicating a risk at the time when the self-vehicle travels each of a plurality of target areas within the risk calculation section including the traveling spot, on the basis of a relative position between the target area and the surrounding vehicle and the travel control information of the surrounding vehicle;

extracting a section whose travel risk value is lower than that at the traveling spot, out of the risk calculation section, as a risk reduction section;

correcting the travel plan so as to cause the self-vehicle to move to the risk reduction section; and

in the correcting of the travel plan, correcting the travel plan so as to cause the self-vehicle to move to the risk reduction section even when there is a risk increase section whose travel risk value is higher than that at the traveling spot, between the traveling spot and the risk reduction section,

calculating a movement recommendation value which is an index to be used to determine whether to move from the traveling spot to the risk reduction section,

determining whether to correct the travel plan so as to cause the self-vehicle to move to the risk reduction section, on the basis of the movement recommendation value, when the risk increase section is present between the traveling spot and the risk reduction section,

calculating, for each of all the risk reduction sections within the risk calculation section, a section movement recommendation value serving as an index to be used to determine whether to move to the risk reduction section through the risk increase section which is an immediately preceding section of the risk reduction section, and

setting an accumulated value obtained by accumulating the section movement recommendation values from the traveling spot to the risk reduction section as the movement recommendation value for the risk reduction section.

15. The travel plan correction device according to claim 12 , wherein the presentation image is an image indicating a relative position between the moving path to the risk reduction section and the surrounding vehicle, as seen from above the self-vehicle.

16. A travel plan correction device of a self-vehicle on which an autonomous driving control device performs travel control on the basis of a travel plan of the self-vehicle, comprising:

a processor to execute a program; and

a memory to store the program which, when executed by the processor, performs processes of,

acquiring a relative position of the self-vehicle with respect to a surrounding vehicle, travel control information of the surrounding vehicle, and the travel plan,

setting a risk calculation section which has a certain relative positional relation with a traveling spot in a case where the self-vehicle travels along the travel plan and includes the traveling spot,

calculating a travel risk value indicating a risk at the time when the self-vehicle travels each of a plurality of target areas within the risk calculation section including the traveling spot, on the basis of a relative position between the target area and the surrounding vehicle and the travel control information of the surrounding vehicle,

extracting a section whose travel risk value is lower than that at the traveling spot, out of the risk calculation section, as a risk reduction section,

correcting the travel plan so as to cause the self-vehicle to move to the risk reduction section, wherein the travel control information of the surrounding vehicle includes information indicating whether the surrounding vehicle performs autonomous driving or manual driving or information indicating an autonomous driving level of the surrounding vehicle.