Control apparatus for hybrid construction machine

A hybrid construction machine, comprising:

• an engine;
• a motor generator driven by the engine and capable of generating electric power;
• a hydraulic pump driven by total torque of the engine and the motor generator;
• a plurality of hydraulic actuators driven by hydraulic fluid delivered from the hydraulic pump;
• a power storage device that stores electric power generated by the motor generator and supplies electric power for driving the motor generator;
• an inverter that performs transfer of electric power between the power storage device and the motor generator;
• a filter that collects a particulate material in exhaust gas of the engine;
• and
• a controller that outputs a command signal to the inverter in order to control powering operation or regeneration operation of the motor generator, wherein the controller is configured to
• decide whether a demand for regeneration of the filter is available,
• calculate a load of the hydraulic pump,
• calculate a powerable amount of the motor generator based on the load of the hydraulic pump,
• calculate a torque command value for the motor generator, and
• limit the powering operation of the motor generator when the demand for regeneration of the filter is available and the torque command value is greater than the powerable amount.