Hybrid driven hydraulic work machine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9068321
APP PUB NO 20150008054A1
SERIAL NO

14344615

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A hybrid-driven hydraulic work machine maintains the torque of the engine at a prescribed value when the load on a hydraulic pump is higher than the rated power of the engine and the electric assist motor assists the torque of the engine. Control of the engine revolution speed is based on the target revolution speed of the engine; engine load calculation; and at least one of: electric motor power running calculation which calculates a differential revolution speed between the target engine revolution speed and the revolution speed of the engine and performs power running control on the electric assist motor depending on the differential revolution speed when the engine load is a prescribed value or higher; and a hydraulic pump absorption torque calculation which performs reduction control on absorption torque of the hydraulic pump depending on the differential revolution speed when the engine load is a prescribed value or higher.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTDTOKYO JAPAN

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hoshino, Masatoshi Tsuchiura, JP 63 672
Ishihara, Shinji Hitachinaka, JP 35 189

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