Information processing method and information processing system for generating a delivery plan using tractor information, trailer information, and delivery information

1. An information processing method executed by a computer, the information processing method comprising:

obtaining tractor information including a battery level of a tractor, trailer information including battery levels of a plurality of trailers, and delivery information including identification information and destinations of goods to be delivered;

generating a delivery plan using the tractor information, the trailer information, and the delivery information; and

outputting the delivery plan generated,

the delivery plan causing the tractor to move the plurality of trailers, each carrying distributed ones of the goods, to the destinations, and satisfying:

(a) a first condition that, when moving the plurality of trailers, the tractor travels using at least one of a battery of a trailer being moved among the plurality of trailers or a battery of the tractor;

(b) a second condition that both (i) the battery level of the tractor is kept above a first lower limit and (ii) the battery levels of the plurality of trailers are kept above a second lower limit; and

(c) a third condition that the battery of the tractor is charged using the battery of the one of the plurality of trailers that is being moved.

2. The information processing method according to claim 1 , wherein

the generating includes generating the delivery plan that further satisfies a fourth condition that at least one of the plurality of trailers is charged at at least one of the destinations.

3. The information processing method according to claim 2 , wherein

the at least one of the plurality of trailers is charged when carrying in or out the distributed ones of the goods to be delivered by the at least one of the plurality of trailers.

4. The information processing method according to claim 1 , wherein

the generating includes generating the delivery plan that further satisfies a fourth condition that the battery level of the tractor is kept at a first upper limit or lower, and the battery levels of the plurality of trailers are kept at a second upper limit or lower.

5. The information processing method according to claim 1 , wherein

the generating includes generating, as the delivery plan, one candidate out of a plurality of candidates for the delivery plan each satisfying at least the first condition, the second condition, and the third condition, the one candidate satisfying a condition related to a time required to deliver the goods.

6. An information processing system, comprising:

an obtainer that obtains tractor information including a battery level of a tractor, trailer information including battery levels of a plurality of trailers, and delivery information including identification information and destinations of goods to be delivered;

a plan maker that generates a delivery plan using the tractor information, the trailer information, and the delivery information; and

an outputter that outputs the delivery plan generated,

the delivery plan causing the tractor to move the plurality of trailers, each carrying distributed ones of the goods, to the destinations, and satisfying:

(a) a first condition that, when moving the plurality of trailers, the tractor travels using at least one of a battery of a trailer being moved among the plurality of trailers or a battery of the tractor;

(b) a second condition that both (i) the battery level of the tractor is kept above a first lower limit and (ii) the battery levels of the plurality of trailers are kept above a second lower limit; and

(c) a third condition that the battery of the tractor is charged using the battery of the one of the plurality of trailers that is being moved.