Information presentation device, information presenting method and non-transitory recording medium

1. An information presentation device comprising a processor configured to:

select a preceding vehicle candidate that is a candidate to be followed by an own vehicle based on information about a surrounding vehicle around the own vehicle;

estimate an extended cruising range of the own vehicle obtained by a follow-up travel of the own vehicle traveling behind the preceding vehicle candidate; and

output, via an output device provided in the own vehicle, the extended cruising range as extension information of a cruising range of the own vehicle when the own vehicle follows the preceding vehicle candidate, wherein

the processor is further configured to

(i) calculate an estimated accuracy of the extended cruising range based on (a) a first confidence degree of a degree of reduction of an air resistance obtained by the follow-up travel of the own vehicle traveling behind the preceding vehicle candidate, the first confidence degree of the degree of reduction of the air resistance being determined from a manner in which information about the preceding vehicle candidate was obtained and a driving support level of the own vehicle, and (b) a second confidence degree of a continuable distance of the own vehicle performing the follow-up travel of following behind the preceding vehicle candidate, the second confidence degree of the continuable distance of the own vehicle performing the follow-up travel being determined from the manner in which the information about the preceding vehicle candidate was obtained and a reliability level of running environment information about a driving route of the own vehicle, and

ii) change an output mode of the extension information based on the estimated accuracy.

2. The information presentation device as claimed in claim 1 , wherein the processor is configured to calculate the estimated accuracy based on a reliability of the information about the preceding vehicle candidate.

3. The information presentation device according to claim 1 , wherein the processor is configured to (i) output the extended cruising range as the extension information when the estimated accuracy is equal to or greater than a threshold value, and (ii) not output the extension information when the estimated accuracy is less than the threshold value.

4. The information presentation device according to claim 1 , wherein the processor is configured to (i) output the extended cruising range as the extension information when the estimated accuracy is equal to or greater than a threshold value, and (ii) output a distance shorter than the extended cruising range as the extension information when the estimated accuracy is less than the threshold value.

5. The information presentation device according to claim 1 , wherein the processor is configured to (i) output the extended cruising range as the extension information when the estimated accuracy is equal to or greater than a first threshold, (ii) output a distance shorter than the extended cruising range as the extension information when the estimated accuracy is less than the first threshold and equal to or greater than a second threshold that is lower than the first threshold, and (iii) not output the extension information when the estimated accuracy is less than the second threshold.

6. An information presenting method executed by a hardware processor, the method comprising:

selecting a preceding vehicle candidate that is a candidate to be followed by an own vehicle based on information about a surrounding vehicle around the own vehicle;

estimating an extended cruising range of the own vehicle obtained by a follow-up travel of the own vehicle traveling behind the preceding vehicle candidate; and

outputting, via an output device provided in the own vehicle, the extended cruising range as extension information of a cruising range of the own vehicle when the own vehicle follows the preceding vehicle candidate, wherein

the hardware processor further:

(i) calculates an estimated accuracy of the extended cruising range based on (a) a first confidence degree of a degree of reduction of an air resistance obtained by the follow-up travel of the own vehicle traveling behind the preceding vehicle candidate, the first confidence degree of the degree of reduction of the air resistance being determined from a manner in which information about the preceding vehicle candidate was obtained and a driving support level of the own vehicle, and (b) a second confidence degree of a continuable distance of the own vehicle performing the follow-up travel of following behind the preceding vehicle candidate, the second confidence degree of the continuable distance of the own vehicle performing the follow-up travel being determined from the manner in which the information about the preceding vehicle candidate was obtained and a reliability level of running environment information about a driving route of the own vehicle, and

(ii) changes an output mode of the extension information based on the estimated accuracy.

7. A non-transitory recording medium having recorded thereon a computer program for presenting information, the computer program, when executed by a hardware processor of a computer, causing the hardware processor to:

select a preceding vehicle candidate that is a candidate to be followed by an own vehicle based on information about a surrounding vehicle around the own vehicle;

estimate an extended cruising range of the own vehicle obtained by a follow-up travel of the own vehicle traveling behind the preceding vehicle candidate; and

output, via an output device provided in the own vehicle, the extended cruising range as extension information of a cruising range of the own vehicle when the own vehicle follows the preceding vehicle candidate, wherein

the computer program further causes the hardware processor to:

(i) calculate an estimated accuracy of the extended cruising range based on (a) a first confidence degree of a degree of reduction of an air resistance obtained by the follow-up travel of the own vehicle traveling behind the preceding vehicle candidate, the first confidence degree of the degree of reduction of the air resistance being determined from a manner in which information about the preceding vehicle candidate was obtained and a driving support level of the own vehicle, and (b) a second confidence degree of a continuable distance of the own vehicle performing the follow-up travel of following behind the preceding vehicle candidate, the second confidence degree of the continuable distance of the own vehicle performing the follow-up travel being determined from the manner in which the information about the preceding vehicle candidate was obtained and a reliability level of running environment information about a driving route of the own vehicle, and

(ii) change an output mode of the extension information based on the estimated accuracy.

8. The information presentation device according to claim 1 , wherein

the first confidence degree of the degree of reduction of the air resistance is higher when the manner in which the information about the preceding vehicle candidate was obtained was by inter-vehicle communication between the own vehicle and the preceding vehicle candidate compared to when the information about the preceding vehicle candidate was obtained by a peripheral information detecting device of the own vehicle;

the first confidence degree of the degree of reduction of the air resistance is higher when the driving support level of the own vehicle automatically controls at least one of acceleration/deceleration and steering of the own vehicle compared to when the acceleration/deceleration and the steering of the own vehicle are not automatically controlled;

the second confidence degree of the continuable distance of the own vehicle performing the follow-up travel is higher when the manner in which the information about the preceding vehicle candidate was obtained was by inter-vehicle communication between the own vehicle and the preceding vehicle candidate compared to when the information about the preceding vehicle candidate was obtained by the peripheral information detecting device of the own vehicle; and

the second confidence degree of the continuable distance of the own vehicle performing the follow-up travel is higher when the running environment information is acquired by inter-vehicle communication between the own vehicle and the preceding vehicle candidate compared to when the running environment information cannot be acquired.