Hitachi, Ltd.

Nec Corporation

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Yosuke Tanabe

Masanori Watanabe

Koichi Watanabe

Tsukasa Funane

Donald James McCune

Makoto Ito

Hisatoshi Kimura

Takahiro Suzuki

Akira Goto

Shinji Seto

Takashi Ogawa

Takafumi Hara

Masanori Takashima

George Saikalis

Katsuhiro Hoshino

Masaki Koyama

Akio Idei

Shigeyasu Tsubaki

Shuhei Nagata

Yoshinori Kawai

Kan Kobayashi

Naoki Yoneya

Tomoaki Yamashita

Naofumi Harada

Naoki Wada

Kiyoshi Morita

Kouichirou Kinoshita

Masahiko Usui

Makoto Henmi

Tomoyuki Ri

Yukinobu Abe

Jason Abbas

Genta Yamauchi

Toshihiko Mochida

An artificial satellite and artificial satellite system has power transmission and reception efficiency and includes an expandable solar panel that generates power, expandable power transmitting antennas, and expandable beam members to connect the solar panel and the power transmitting antennas to each other. The beam members are expanded from being provided in the artificial satellite, on a plurality of rotational symmetry axes of an imaginary polyhedron formed with substantially a center of the artificial satellite as an origin. The beam members are arranged at substantially equal distances in directions of the rotational symmetry axes. A light receiving surface of the solar panel and installation surfaces of the power transmitting antennas, when expanded, are substantially perpendicular to a solar panel rotational symmetry axis passing through a center of the solar panel, and being arranged on opposite sides of a plane passing through the center of the artificial satellite.

Artificial satellite and artificial satellite system

The space structure control system includes: a space structure; an artificial satellite connected to the space structure; and a propulsion device installed on the artificial satellite and configured to control an orbit and an attitude of the artificial satellite, in which the space structure includes a film-like structure, a solar reflectance control device that controls a spatial pattern of a solar reflectance in a reflecting mirror provided in the film-like structure, and a shape retaining device that is connected to the film-like structure, the propulsion device rotates the film-like structure to generate a centrifugal force, the solar reflectance control device controls a solar reflectance in the reflecting mirror to control a solar radiation pressure to be applied to the reflecting mirror, a three-dimensional shape of the film-like structure is controlled based on the centrifugal force generated by the rotation of the film-like structure and the solar radiation pressure, and the shape of the film-like structure is retained or stabilized by the shape retaining device.

Space structure control system and space structure control method

An object of the present invention is to effectively reduce vibration or noise caused by a motor. An inverter circuitgenerates an alternating current from a direct current supplied from a direct current power supplyby using a plurality of IGBTswhich are switching elements, supplies the generated alternating current to a motor, and drives the motor. This alternating current includes a fundamental harmonic current corresponding to a rotational speed of the motor, and a harmonic current of a switching operation of the IGBTs. A controllercontrols a second phase such that a first phase and the second phase are not superimposed on each other at a predetermined motor rotational speed, the first phase being a phase of an excitation force cyclically produced in the motorby the fundamental harmonic current, and the second phase being a phase of an excitation force cyclically produced in the motorby the harmonic current.

Inverter control device

In an air suspension system, starting of a compressor is facilitated in a condition in which there exists a pressure difference. There is provided an air suspension system in which air compressed by a compressor is supplied to a plurality of air chambers provided between a vehicle body side and a wheel side and configured to perform vehicle height adjustment in accordance with the supply and discharge of air. The compressor has a needle connected to a piston and extending in a moving direction of the piston, and an armature reciprocating the needle in the moving direction of the piston.

Air suspension system

A control apparatus sets, in a relay device: first control information that forwards, when a packet for flooding is received by a representative port of a trunk, the packet to a prescribed forwarding destination port and to a representative port of another trunk; second control information that executes, when the packet for flooding is received by a nonrepresentative port of the truck, forwarding of the packet to a stack link port associated with the same trunk group as the trunk of the port that received the packet for flooding, and forwarding to a nonrepresentative port of another trunk in the trunk group; and third control information that forwards, when the packet for flooding is received by the stack link port, the packet to a prescribed forwarding destination port and to a representative port of a trunk not belonging to the same trunk group.

Packet forwarding system, control apparatus, and control method and program for relay device

A problem of the present invention is to provide a vibration analysis program capable of analyzing bidirectional exchanges between a distribution amount and a difference amount with respect to an external system of the part in a part modeled as a finite element, in which the difference amount accumulation characteristic and the distribution amount accumulation characteristic are distributed. A vibration analysis program of the present invention includes a first stepof importing a finite element model of a target part modeled by a finite element method programto calculate an accumulation characteristic matrix and connection matrix, a second stepof calculating a difference amount-distribution amount mode matrix and eigenvectors after inputtingan attenuation characteristic to the accumulation characteristic matrix or the connection matrix as necessary, and a third stepof importing an input difference amount-flow amount vector to a target part obtained from an external system simulator, performing a mode coordinate transformation of the input difference amount-flow amount vector, calculating the mode vector response, and performing physical coordinate transformation of mode vector.

Oscillation analysis program and device

A method and apparatus for controlling a solenoid actuated inlet valve to a pump chamber of a piston pump. A control circuit energizes the solenoid to open the inlet valve in synchronism with the reciprocation of the piston and thereafter de-energize the solenoid to initiate closure of the inlet valve. The inlet valve is decelerated following de-energization of the solenoid thus effectively reducing engine noise attributable to the inlet valve.

Method and apparatus for controlling a solenoid actuated inlet valve

A communication system includes: a control apparatus that sets broadcast domains or multicast domains respectively for virtual networks configured in a physical network including a forwarding node(s), and sets, in the forwarding node(s), broadcast or multicast control information, associating a packet forwarding destination and a match condition including an identifier for identifying one of the broadcast domains or multicast domains; and the forwarding node(s) that performs a broadcast or multicast using the broadcast or multicast control information.

Signal processing apparatus and signal processing method thereof for implementing a broadcast or a multicast communication

A fuel pump for a direct injection internal combustion engine having a housing defining a pump chamber. Driven and idler toothed gears are rotatably mounted within the pump chamber so that the driven and idler gears are in mesh with each other at a predetermined location in the pump chamber. A fluid inlet is formed through the housing and open to an inlet subchamber in the pump chamber. A fluid outlet is also formed through the housing and open to an outlet subchamber in the pump chamber. A pressure relief passageway fluidly connects the inlet subchamber to the outlet subchamber and a valve is disposed in series with the pressure relief passageway. A control circuit controls the actuation of the valve to control the pump pressure at the pump outlet.

Fuel pump for an internal combustion engine

A method to reduce engine noise in a multi-cylinder direct injection internal combustion engine. The internal combustion engine includes a high pressure fuel pump having both an inlet valve fluidly connected to a fuel source and an outlet valve typically connected to a pressurized fuel rail. In order to reduce engine noise, especially at low engine speeds, the timing of the opening of either the fuel pump inlet valve or fuel pump outlet valve is varied so that it coincides with the opening of the fuel injectors.

Method and apparatus for reducing the number of separately distinguishable noise peaks in a direct injection engine

Silencing equipment provided with one or more flow channels through which cooling air flows has a flow channel forming member that forms the flow channel, and an acoustic absorbent member that is fixed to the flow channel forming member. A resonance type silencer is formed on a wall surface of the flow channel by providing a cavity for the resonance type silencer in the acoustic absorbent member and an aperture for the resonance type silencer in a portion of the flow channel forming member. The resonance type silencer sets a frequency of noise necessary to be reduced based on a peak frequency of noise generated by a fan. The silencing equipment further has a slide member which slides by a slide mechanism to adjust the area of the top of the aperture. The silencing equipment for electronic devices capable of cooling heat generating sections thereof with air has a small and simple structure and can improve a silencing effect by blowing air.

Silencing equipment for electric devices

Disclosed herein is a sound absorbing system used for an electronic device that has enhanced noise reduction capabilities, while maintaining the cooling performance of the device and without increasing the size of the device. A disk array has multiple fans installed on each of the right and left sides of its front section. A frame that houses a sound absorbing system is placed in the middle of an airflow path through which air passes from the fans. Two sound absorbers are arranged inside the frame such that each of the sound absorbers faces the right-side or left-side fans. Airflow paths through which air passes from the fans are located in the space between the two sound absorbers. The airflow paths are partitioned by an acoustic board such that each of the airflow paths does not have parallel side faces. The frame, the sound absorbers, the acoustic board, and the airflow paths constitute the sound absorbing system. The sound absorbers and the acoustic board are made of sound absorbing materials such as glass wool, urethane foam, and the like. The sound absorbers and the acoustic board are arranged such that they prevent the fans from being seen from the outside of the sound absorbing system.

Sound absorbing system for electronic device

Growing community of inventors

Tokyo, Japan

Yosuke Tanabe