Patent ID: 8862343

Claim:
A turning control apparatus for a hybrid construction machine which comprises an engine, an oil hydraulic pump, an electric energy storage device, an engine assistant motor, a turning motor, a power converter, a battery mounted in a vehicle separately from the electric energy storage device, and a hybrid control unit (HCU), the turning control apparatus comprising: an SMPS configured to apply operating electric power to the hybrid control unit (HCU) by being supplied with operating electric power from the battery; a first switch Key 1 configured to switch a VKey_On path which allows operating electric power to be supplied from the battery to the SMPS when a key on signal of a driver is inputted; and a second switch Key 2 configured to switch a VKey_Out path which allows operating electric power to be supplied from the battery to the SMPS when an operation of the first switch Key 1 is stopped, wherein the second switch Key 2 is switched when it is confirmed that the turning motor is being driven in a state in which an operation of the first switch Key 1 is stopped; wherein when the first switch Key 1 is turned off in a state in which the second switch Key 2 is switched by a drive of the turning motor, the hybrid control unit (HCU) performs a brake control of the turning motor to stop the turning motor, and then turns off the second switch Key 2 to block operating electric power which is supplied from the battery.