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US 9,068,321 B2Granted
Hybrid driven hydraulic work machine
AssigneeHitachi Construction Machinery Co., Ltd.
InventorsMasatoshi Hoshino, Shinji Ishihara
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AssigneeHitachi Construction Machinery Co., Ltd.
InventorsMasatoshi Hoshino, Shinji Ishihara
Estimating the term…
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.
A hybrid-driven hydraulic work machine comprising an engine (7), a hydraulic pump (6) of the variable displacement type which is driven and rotated by the engine (7), an electric assist motor (10) which is linked to the engine (7) and the hydraulic pump (6), a plurality of actuators (3a-3f) which are driven by hydraulic fluid delivered from the hydraulic pump (6), and a plurality of operation devices (4a, 4b) having operation members and outputting operation signals corresponding to operations on the operation members to cause the actuators to operate, wherein the hybrid-driven hydraulic work machine comprises:
A hybrid-driven hydraulic work machine comprising an engine (7), a hydraulic pump (6) of the variable displacement type which is driven and rotated by the engine (7), an electric assist motor (10) which is linked to the engine (7) and the hydraulic pump (6), a plurality of actuators (3a-3f) which are driven by hydraulic fluid delivered from the hydraulic pump (6), and a plurality of operation devices (4a, 4b) having operation members and outputting operation signals corresponding to operations on the operation members to cause the actuators to operate, wherein the hybrid-driven hydraulic work machine comprises:
Dependencies are inferred from the claim text.