公开(公告)号：US20220308589A1

公开(公告)日：2022-09-29

申请号：US17594961

申请日：2020-05-08

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hirotake ISHII ,  Tomoyuki HAMADA ,  Hidefumi ISHIMOTO ,  Akiyoshi KIRIMURA

IPC: G05D1/02 ,  G08G1/16 ,  H04W4/40 ,  G01S19/14

Abstract: A vehicle control system includes an autonomous traveling vehicle configured to autonomously travel in a mine, a manned vehicle. The autonomous traveling vehicle and the manned vehicle each include an own position estimating device and a vehicle mounted communication terminal. The autonomous traveling vehicle and the manned vehicle are communicatively connected via one wireless channel. The manned vehicle transmits manned vehicle location information using a first communication method at a first granularity. When a distance from the manned vehicle is determined to be a first inter-vehicular distance threshold or less based on the manned vehicle location information transmitted by the first communication method, the autonomous traveling vehicle instructs the manned vehicle to transmit the manned vehicle location information by a second communication method different from the first communication method at a second granularity smaller than the first granularity.

公开(公告)号：US20240163764A1

公开(公告)日：2024-05-16

申请号：US18279406

申请日：2022-06-07

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hirotake ISHII ,  Hidefumi ISHIMOTO ,  Akiyoshi KIRIMURA ,  Yuusuke EGUCHI

IPC: H04W36/32 ,  H04W36/18 ,  H04W36/30

CPC classification number: H04W36/32 ,  H04W36/18 ,  H04W36/30

Abstract: Provided is a vehicle control system that can prevent delays and losses in packet communication, prevent handover failures, and improve productivity while ensuring safety for various types of vehicles. The vehicle control system includes an on-board terminal mounted on a vehicle and including a plurality of wireless modems; a plurality of wireless base stations that wirelessly communicate with the on-board terminal, and form a plurality of cells; and a vehicle central control device that communicates with the on-board terminal via one of the wireless base stations. Each of the plurality of wireless modems is configured to be able to, when the vehicle moves across the plurality of cells, execute a handover to switch a connection to one of the plurality of wireless base stations to another. Each of the plurality of wireless modems is configured to be able to set threshold for executing the handover different from the others.

公开(公告)号：US20230202512A1

公开(公告)日：2023-06-29

申请号：US17928110

申请日：2021-05-11

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hirotake ISHII ,  Hidefumi ISHIMOTO ,  Akiyoshi KIRIMURA

IPC: B60W60/00 ,  G05D1/02 ,  B60W30/16 ,  H04W76/14 ,  H04W64/00

CPC classification number: B60W60/001 ,  B60W30/16 ,  G05D1/0295 ,  H04W64/00 ,  H04W76/14 ,  B60W2754/10 ,  G05D2201/0202

Abstract: A vehicle control system that makes it possible to ensure the safety and enhance the productivity at the same time is provided. An unmanned dump 10 receives positional information about a manned vehicle 20 by using infrastructure-to-vehicle communication 520 and infrastructure-to-infrastructure communication 510. In a case where an inter-vehicle distance X between the unmanned dump 10 and the manned vehicle 20 is equal to or shorter than a reference distance Y, the unmanned dump 10 decides whether or not vehicle-to-vehicle communication 550 is established between the unmanned dump 10 and the manned vehicle 20. In a case where it is decided that the vehicle-to-vehicle communication 550 is established, the upper limit of the travel speed of the unmanned dump 10 is set to a first speed V1, and in a case where it is decided that the vehicle-to-vehicle communication 550 is not established, the upper limit of the travel speed of the unmanned dump 10 is set to a second speed V2.