Hitachi Construction Machinery Co., Ltd.

Akiyoshi Kirimura

Hidefumi Ishimoto

Tomoyuki Hamada

Hirotake Ishii

Tsutomu Yamada

Takeshi Ito

Ryota Yamasaki

Seiya Katou

Yuichi Kuramochi

A vehicle control system that makes it possible to ensure the safety and enhance the productivity at the same time is provided. An unmanned dumpreceives positional information about a manned vehicleby using infrastructure-to-vehicle communicationand infrastructure-to-infrastructure communication. In a case where an inter-vehicle distance X between the unmanned dumpand the manned vehicleis equal to or shorter than a reference distance Y, the unmanned dumpdecides whether or not vehicle-to-vehicle communicationis established between the unmanned dumpand the manned vehicle. In a case where it is decided that the vehicle-to-vehicle communicationis established, the upper limit of the travel speed of the unmanned dumpis set to a first speed V, and in a case where it is decided that the vehicle-to-vehicle communicationis not established, the upper limit of the travel speed of the unmanned dumpis set to a second speed V

Vehicle control system

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.

A safety switch input diagnosis device includes a circuit formed from a series connection of an emergency stop switch and a line having a resistor. A connection state of the emergency stop switch and failure modes of the lines are diagnosed on the basis of a voltage value at one end of the circuit. Consequently, an operation of the switch and failure modes of a circuit relating to the switch can be diagnosed.

Safety switch input diagnosis device and work machine using safety switch input diagnosis device

An on-board terminal device includes a location measuring section that measures a location of an own vehicle, a wireless communication section that transmits own vehicle information including location information of the own vehicle to other vehicles and receives other vehicle information including location information of the other vehicles from the other vehicles by execution of wireless communication with the other vehicles, and a monitoring section that estimates the location of the other vehicles and calculates a relative distance between the own vehicle and the other vehicles when the wireless communication has been interrupted, and executes an alarm process for preventing collision of the own vehicle and the other vehicles when the relative distance is less than a predetermined threshold.

On-board terminal device and vehicle collision prevention method

A wireless communication system includes an on-board terminal equipment mounted on a working machine, and a control server communicably connected together via a network including a first wireless base station and a second wireless base station. The control server sets a zone of a travel route as a travel-permitted zone, for which a travel permission has been given only to the working machine. A permission requesting zone in the travel-permitted zone, in which the working machine makes a setting request to the control server for a new travel-permitted zone, is set as a no-handover zone in which switching of the connected base station from the first wireless base station to the second wireless base station is prohibited. The on-board terminal equipment switches the first wireless base station to the second wireless base in a zone other than the no-handover zone in the travel-permitted zone.

Growing community of inventors

Tsuchiura, Japan

Akiyoshi Kirimura