Hybrid construction machine and method for controlling the same

摘要

Provided is a hybrid construction machine together with a method for controlling that construction machine in a manner ensuring the operability of its combined operations regardless of fluctuations in the load on its work machine.;The hybrid construction machine has: a swing structure; a work machine attached to the swing structure; an engine mounted on the swing structure; a first electric motor driven by the engine, the motor being capable of generating power; a hydraulic pump driven by the engine and the first electric motor; a second electric motor for driving the swing structure; and a plurality of electric storage devices, wherein the hybrid construction machine further includes a first control unit which, in a combined operation involving the work machine and the swing structure, drives and controls the second electric motor by use of the electric power supplied from at least one electric storage device selected from the storage devices and from another electric storage device offering a higher output level and a lower stored energy level per unit weight than the selected at least one electric storage device, and drives and controls the hydraulic pump by use of the engine.

主权项

1. A hybrid construction machine comprising:
a swing structure; a work machine attached to the swing structure; an engine mounted on the swing structure; a first electric motor driven by the engine, the motor being capable of generating power; a hydraulic pump driven by the engine and the first electric motor; a hydraulic actuator which drives and operates the work machine by use of power generated through the hydraulic pump; a second electric motor for driving the swing structure; and a plurality of electric storage devices for supplying electric power to drive the first electric motor and the second electric motor and for being charged with electric power generated through the first electric motor and the second electric motor, wherein
the hybrid construction machine further includes:
a first control unit which, in a combined operation involving the work machine and the swing structure, drives and controls the second electric motor by use of the electric power supplied from at least the first electric storage device selected from the storage devices and from a second electric storage device selected from the storage devices offering a higher electric power level and a lower stored energy level per unit weight than the first electric storage device, and drives and controls the hydraulic pump by use of the engine.