Komatsu Corporation

The Furukawa Electric Co., Ltd.

The University of Tokyo

Takeshi Ooi

Teruo Akiyama

Masashi Ichihara

Hisashi Asada

Tetsuya Hamaguchi

Hiroaki Rikihisa

Jin Kitajima

Kazuhiro Maruta

Yoshinori Matsunaga

A first target engine speed is set in response to a command value commanded by a command unit. A second target engine speed equal to or lower than the first target engine speed is set based on the first target engine speed. When the first target engine speed is reduced, the second target engine speed is set to be constant or be decreased and a reduction range for decreasing the first target engine speed to the second target engine speed is set to be decreased. The reduction range is set at zero when the first target engine speed is equal to or lower than an engine speed at least at a maximum torque point.

Engine control device

The system includes: a variable displacement hydraulic pump supplying pressure oil to a hydraulic actuator; a pressure detector detecting a pump discharge pressure from the hydraulic pump; a control valve controlling a supply of the pressure oil to the hydraulic actuator; a controller controlling a pump displacement of the hydraulic pump; a hydraulic motor rotating an upper structure of the construction machine; a swing relief valve defining a relief pressure of the hydraulic motor; and a control lever switching a control valve for the hydraulic motor. The controller includes: an adjuster that, when a pump discharge pressure detected by the pressure detector exceeds a first set value, conducts an adjustment to reduce the pump displacement; and a canceller that cancels the adjustment when the pump discharge pressure falls below a second set value. The second set value is equal to or larger than the first set value.

Swing drive controlling system for construction machine

A first target engine speed Nand a high-speed control area Fare set according to a command value commanded by a command unit. A second target engine speed Nand a high-speed control area Fdefined on a low-speed side are set according to the first target engine speed N. A pump displacement D and an engine torque T of a variable displacement hydraulic pump are detected so that a target engine speed N corresponding to each of the detected pump displacement and engine torque is detected according to a preset relationship between a the pump displacement D and the target engine speed N and a preset relationship between the engine torque T and the target engine speed N during an engine control at the high-speed control area F. The drive of the engine is controlled so that the engine is driven at the target engine speed N.

Engine control device and engine control method

A first target engine speed is set in response to a command value commanded by a command unit and a second target engine speed lower than the first target engine speed is set based on the first target engine speed. A reduction range from the first target engine speed to the second target engine speed is set according to a type of a hydraulic actuator operated by an operation lever or a combination of plural hydraulic actuators operated by an operation lever.

A fuel mixture for fuel cells, comprising a gelled product containing at least a fuel and a gelling agent, in which reliquefaction for the fuel of the gelled product is brought about in the coexistence with a reliquefying agent; and a method of extracting a fuel for fuel cells, including: providing a gel structure in which a fuel is incorporated into a network structure of a gelling agent, with a reliquefying agent dispersed therein; adding a reliquefaction inducing agent to the gel structure to make the reliquefying agent break the network structure of the gelling agent, and thereby reliquefying and extracting the fuel.

Fuel mixture, fuel reliquefying system, fuel cartridge using the same, and method of extracting fuel; for fuel cells

A liquid actuator, which contains: an electrolyte layer () containing a liquid, two or more electrically separated electrode parts () on one or both sides of the electrolyte layer, and a water-repellent layer () having a porous structure on an outside surface of at least one of the electrode parts, in which the electrolyte layer (), the electrode parts (), and the water-repellent layer () form a structural body,

Growing community of inventors

Kanagawa, Japan

Takeshi Ooi