Hitachi, Ltd.

Hitachi Construction Machinery Co., Ltd.

Honda Motor Co., Ltd.

Ryota Yamasaki

Atsushi Ogino

Takaki Uta

Tsutomu Yamada

Tomoyuki Hamada

Takashi Yano

Katsuhiko Tsunehara

Masaaki Shida

Hideya Suzuki

Nobukazu Doi

Kumiko Takikawa

Tsuyoshi Tamaki

Yoshinori Ookura

Hidefumi Ishimoto

Tomoyuki Noguchi

Fumio Egashira

Akiyoshi Kirimura

Naoto Matsuzawa

Kenichi Sakai

The disclosure provides a control method, a control device for vehicular automatic transmission, and a recording medium. The control device includes an ON/OFF control solenoid controlling LC to either ON or OFF, and an LC pressure control linear solenoid controlling LC pressure between a released state and a fully engaged state. The control device acquires, when an accelerator pedal opening of a vehicle is on a deceleration side in a fully closed state, a torque converter slip ratio when the ON/OFF control solenoid maintains ON for a predetermined time period and the LC pressure control linear solenoid is controlled such that the LC pressure is OFF, and determines whether or not the second solenoid has a high-pressure fixation failure according to whether or not the slip ratio is within a predetermined range from a slip reference value.

Control method and control device for vehicular automatic transmission and recording medium

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.

Wireless communication system, control server, and base-station switching operation control method

A wireless system for a mine performs a management of the quality of wireless communication at each point in the mine at a time point closer to a current time while maintaining the operating state of each dump truck. The wireless system is provided with a server, wireless base stations and dump trucks in the mine. The server contains fleet operations management information and communication quality information, and the dump trucks each include a GPS and a wireless terminal. The server specifies an update target point where the communication quality information requires an update. Then, the server specifies one of the dump trucks, which is plan to travel through the update target point, from the fleet operations management information, calculates a time at which the dump truck would arrive at the update target point, and performs communication trigger processing to make the dump truck transmit wireless data.

Wireless system and operation management server

To provide a technology that enables dump trucks to travel smoothly even in a mine where electromagnetic wave conditions are bad. The invention is a vehicle travel system in which haulage vehiclestraveling in a premise of a mine along predetermined travel routesand a fleet management server for managing operations of haulage vehicles are connected in communication together via wireless communication network and that sets a travel-permitted segment n+1 so that difference between a communication timing at which the haulage vehicle-transmits permission request information to the fleet management server from a provisional permission-requesting point RP and communication timing at which other haulage vehicle transmits the permission request information to the same wireless base station may become more than or equal to a predetermined threshold value.

Vehicle travel route control system and fleet management server

A fleet management server is connected to onboard terminal equipments mounted on plural haulage vehicles. The server includes an operation mode determination unit and operation mode switching unit. The determination unit determines whether or not an operation mode, in which segment setting processing is performed to set travel-permitted segments for the vehicles, respectively, needs switching between a bidirectional mode and a push mode. In the bidirectional mode, the processing is performed to send response information upon reception of request information from each onboard terminal equipment. In the push mode, a travel-permitted segment setting unit, without reception of such request information, performs the processing for one of the vehicles to set a new travel-permitted segment, and produces and transmits travel permission information indicating the new travel-permitted segment. The switching unit performs switching processing of the operation mode according to the results of the determination.

Fleet management server, onboard terminal equipment, and fleet management system

The present invention provides a mechanism for recording only a received radio signal conforming to recording conditions and discarding a received radio signal not conforming to the recording conditions. The radio communication unit includes:

Radio signal receiver unit and signal processing unit

In a position detection system utilizing a WLAN supporting multiple data transfer rates, it is possible to reduce the number of required installed base stations, so system construction costs can be lowered. In a wireless station, a transmitted signal is judged at the time of transmission, and in case it is normal user data, the signal is transmitted by setting optimal transmission parameters for which a high communication throughput with wireless communication is obtained, and in case it is a position detection signal, the aforementioned signal is transmitted by setting transmission parameters for which the service range is increased. As a transmission parameter for which the service range is increased, a low data transfer rate or a long preamble length is used.

Method, system and apparatus for detecting a position of a terminal in a network

In any indoor location, whenever operating a wireless terminal position detecting system comprising a transferable wireless terminal, a plurality of base stations individually allowing a connection from said wireless terminal, and a plurality of wireless receiving stations individually receiving wireless signal from said terminal and base stations, there is a problem in terms of the provision of a method for minimizing positional detection error on the part of said wireless terminal and a method for practically realizing said method. Hence, to solve the above problem, the present invention provides a wireless terminal position detecting method featuring the function to evaluate the result of measurement against wireless signals from an objective wireless terminal received by individual wireless receiving stations based on a definition of a plurality of position detectable areas designating a geographic range required for detecting actual position of said objective wireless terminal and also based on another definition for specifying plural wireless receiving stations each being located at a predetermined known position allocated for individual areas for detecting actual position of the objective wireless terminal in respective position detectable areas before eventually determining the actual position of the objective wireless terminal.

Wireless terminal position detecting method and system therefor

When one base station to which a terminal is to connect is determined from a plurality of base stations in a wireless communication system, the best base station is selected according to the communication quality or the content of communication services. In the wireless communication system, the plurality of base stations are classified into a plurality of groups. Indexes of communication quality between the base stations and the terminal are obtained and, for each group, the characterizing quantities of the indexes of communication quality are calculated. The base station group with which the terminal is to communicate is specified based on the characterizing quantities. One of the base stations in the specified group is determined as a communication destination base station.

Method for selecting base station

A method, system, and apparatus are provided for detecting a position of a terminal in a network accurately without a GPS receiver. In one example, a method for locating a position of a terminal includes calculating a position of a base station; detecting a clock time difference between the base station and another base station; measuring a reception timing of a signal received by the base station from the terminal; and locating the position of the terminal using at least the position of the base station, the clock time difference, and the reception timing.

Method, system, and apparatus for detecting a position of a terminal in a network

In a position detection system for detecting a position of a terminal apparatus of a radio communications system, a position detection time is shortened using a position detection method for determining signal times-of-arrival between the terminal apparatus and base stations neighboring the terminal apparatus. According to the present invention, means for generating a database in which received power information about signals transferred between the terminal apparatus and the base stations neighboring the terminal apparatus corresponds to position information about the terminal apparatus, and for determining the position information by searching received power information obtained in the position detection from the database, and means for determining the position by use of signal times-of-arrival are executed in parallel. Then, the use of a result of the means which has detected the position earlier than another means shortens the position detection time.

System and method for position detection of a terminal in a network

A method and system for detecting the position of a mobile unit efficiently and with high precision in a multipath environment. A wireless position detection system made up of a mobile station containing a wireless communication means to allow sending and receiving multiple to and from mutually different antenna positions and, a base station for performing wireless communication with mobile stations containing a wireless communication means and, multiple wireless receivers for receiving each of the multiple signals sent by the wireless communication means between the base stations and, a server for detecting the position of the mobile station from each wireless receiver and from the position of the base station, and the time relating to received signals measured by the multiple wireless receivers.

Wireless position measurement method and wireless position measurement system

In a positioning system using the time difference of arrival of signals between a station and a plurality of access points, each of the access points repeatedly measures a signal for calculating a position from the station, while changing any of time, the position of the station, and a frequency in use, and accumulates a plurality of measurement data. A position calculation server determines a given timing on each of a plurality of delay profiles created based on the measurement data obtained from the access points as a reception timing sample for the signal, performs a combination process with respect to the plurality of reception timing samples, and determines one reception timing for each of the access points. The position calculation server calculates the time difference of arrival of signals between the station and the access points based on the reception timings and calculates the coordinates of the position of the station.

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Kokubunji, Japan

Ryota Yamasaki