Control system and method for hybrid construction machine

摘要

A control system and method for a hybrid construction machine is provided. The control system for a hybrid construction machine includes an engine (10), a hydraulic pump (13) driven by the engine (10) to drive a hydraulic actuator (15), a motor-generator (17) driven by the engine (10) to generate electricity and to drive the hydraulic pump (13) as a motor supplementing the engine (10), an energy storage device (19) charged with electric energy generated by the motor-generator (17) and supplying the electric energy for motor operation of the motor-generator (17), a mode detector (60) detecting a working mode of the engine (10), a torque detector (70) detecting an output torque of the hydraulic pump (13), a memory (40) storing upper and lower baselines of an engine torque set per working mode of the engine (10), and a hybrid controller (50) comparing the detected output torque of the hydraulic pump (13) with the upper and lower baselines set according to the detected working mode, controlling power generation of the motor-generator (17) so that the engine (10) is loaded as much as a short value if the output torque is less than the lower baseline, and controlling the motor operation of the motor-generator (17) so that the engine output is supplemented as much as an excessive value if the output torque exceeds the upper baseline.