Hitachi Systems, Ltd.

Akebono Brake Industry Co., Ltd.

Nitto Kohki Co., Ltd.

Akebono Research and Developement Centre Ltd.

Minoru Kaneko

Kazuo Hashimoto

Yuji Ogata

Yoshihito Narita

Fumio Enmei

Toshio Mikiya

Kazuki Watanabe

Atsushi Suzuki

Hironori Wakana

Takashi Sakai

Toru Kono

Yasuo Kazama

Kentarou Oonishi

Daisuke Katsumata

Tadanori Koike

Keiichi Nagashima

A defective photovoltaic cell module is identified without disconnection in a photovoltaic cell string. As a typical embodiment, in a photovoltaic power generation inspection system in a photovoltaic power generation system having a structure in which a plurality of photovoltaic cell strings are connected in parallel, the photovoltaic power generation system detecting a defective module among a plurality of modules included in a defective string, the photovoltaic power generation inspection system includes: a current detector that measures an output current of a photovoltaic cell string without disconnection; and a monitor unit that estimates a defective module based on change in a plurality of output currents each measured by the current detector while the photovoltaic cell modules included in the defective string are sequentially shielded from light by a light shielding member.

Solar power generation examination system and solar power generation examination method

An increase in communication traffic at the time of transmission of commands of controlling power consumption of individual buildings can be suppressed so as to be low. A wide area management system includes a wide area management device that includes a database that stores a command table and a transmission unit that transmits a control command to each uppermost-level building management device and building management devices, each of which includes a database that stores a management table and a building-associated correspondence table, a transfer unit where, in a case where a reception unit receives the control command, specifies lower-level building management devices by referring to the management table and transfers the received control command to each of the specified building management devices, an event program extraction unit that extracts an event program corresponding to the control command from a building-associated correspondence table, and an event program execution unit that executes the extracted event program to control power consumption of the buildings.

Managing energy consumption of a building in an interconnected wide area management system

Even when there are a lot of buildings as a management target, a power consumption of each building can be appropriately managed. A broad area management systemis provided with a broad area management apparatusin which a control command reception unitreceiving a selection of a control command of a power consumption from an operation terminal of an administrator and a transmission unittransmitting received one control command to a plurality of building management apparatusesare included, and the building management apparatusin which an event program execution unitstoring an event program in association with the control command, a reception unitextracting the event program corresponding to the control command from the event program execution unitin a case where the control command is received from the broad area management apparatus, an event program extraction unitcontrolling the power consumption of each facilityby executing the extracted event program.

Broad area management system, broad area management apparatus, building management apparatus, and broad area management method

A photovoltaic inspection system is provided, the photovoltaic inspection system detecting a failure by eliminating ON/OFF operation of a switch or others at the time of inspection or checkup as much as possible, reducing an influence of a temperature distribution as a whole with a small effort, and detecting a local deterioration in a photovoltaic module or string. According to a typical embodiment, in a photovoltaic system having a plurality of photovoltaic strings formed of one or a plurality of photovoltaic modules arranged to be aligned, a photovoltaic inspection system which detects the failure in the photovoltaic strings includes: a current detector which measures each of a first output current of a first photovoltaic string and a second output current of a second photovoltaic string; and a monitoring unit which calculates a second temperature property of the second photovoltaic string based on a value of the first output current and a value of the second output current and which determines whether the second photovoltaic string has the failure or not based on the second temperature property.

Photovoltaic inspection system and photovoltaic inspection method

A sine wave electric signal whose frequency continuously varies within a predetermined frequency range is applied to a piezoelectric speaker, whereby a vibration frequency characteristic of the piezoelectric speaker is detected. A change of the frequency characteristic of the piezoelectric speaker when the piezoelectric speaker is brought into contact with concrete filled into a precast concrete form is detected based on the vibration frequency characteristic detected. With this unique feature, a filling status of concrete in the precast concrete form can exactly be detected independently of the hardness of water contained in the concrete and ambient temperature, and even if a temperature difference between air and the concrete is small.

Filler detection method and filler detection device

In the present sensor element failure or end of life judging method, the internal impedance of a gas sensor element is measured and, if the thus measured internal impedance goes beyond a previously determined threshold value, then it is judged that the gas sensor element fails or comes to the end of life.

Method for judging the failure or end of life of a sensor element

A cushioning device for use with a pneumatic impact tool which utilizes a part of compressed air for driving the piston of the tool as cushioning means and is self controllable.

Growing community of inventors

Tokyo, Japan

Minoru Kaneko