Drive control device for hybrid construction machine, hybrid construction machine and drive control program thereof

摘要

PROBLEM TO BE SOLVED: To perform assisting operation and/or power generation operation for an engine by a motor-generator with a simple structure and accurately control the engine in a target operation state in a hybrid construction machine. SOLUTION: An engine speed Nr corresponding to optimum torque of a set speed N0 is calculated as a target speed in a controller 9. When load torque of the engine 1 is large and an engine speed N is lower than the target speed Nr , the motor-generator 6 is operated as a motor in correspondence with a deviation Nr so as to perform torque assistance. When the load torque of the engine 1 is small and the engine speed N is higher than the target speed Nr , the motor-generator 6 is operated as a generator in correspondence with the deviation Nr so as to generate electric power and accumulate the electricity in a battery 7. Thus, the engine 1 is controlled to get closer to the optimum operation state.