Patent ID: 9617714
Date: 2017-04-11
CPC Classifications: B60W,B60Y,E02F,Y10S

Claim:
1. A hybrid construction machine comprising: an engine; a hydraulic pump driven with the engine; a hydraulic working unit driven with pressure oil discharged from the hydraulic pump; a motor generator that transmits torque to the engine, and performs motive-power assistance to the engine and power generation; a power storage device that supplies/receives electric power to/from the motor generator; an engine rotation speed detection unit that detects a rotation speed of the engine; an engine state determination unit that determines a state of output torque of the engine; a load torque detection unit that detects load torque of the hydraulic pump; and an engine assistance limiting unit that, when the rotation speed of the engine detected with the engine rotation speed detection unit is equal to or greater than a predetermined rotation speed which is set to a rotation speed lower than a rotation speed during idling, and the engine state determination unit determines that the output torque of the engine has not become a predetermined minimum torque which is set as an output torque during idling, limits the motive-power assistance with the motor generator to the engine, and, when the load torque of the hydraulic pump detected with the load torque detection unit is lower than a predetermined torque which is set to a maximum output torque of the engine, limits the motive-power assistance with the motor generator to the engine.