Patent ID: 6922990

Claim:
A hybrid power system for driving a hydraulic pump in construction equipment, in which an inflow of discharge oil from the hydraulic pump to hydraulic actuators is controlled to drive at least one working machine, said power system comprising: an engine for driving the hydraulic pump, said hydraulic pump being connected to said engine via a first power take-off; a regenerative motor which is driven by receiving return pressure from said hydraulic actuators, and which regenerates at least one of inertia energy and potential energy of said working machine to drive said hydraulic pump; and a generator motor for driving the hydraulic pump in combination with the engine, said generator motor being driven as a generator by surplus torque when a regeneration torque of said regenerative motor is larger than a driving torque of said hydraulic pump, and said generator motor being drivable as an electric motor to assist with driving of said hydraulic pump; wherein the regenerative motor and the generator motor provided in parallel with said hydraulic pump via said first power take-off.