Control system for hybrid construction machine
View Patent ↗A controller is connected to a pressure sensor. The controller controls a regulator of a sub-pump in accordance with a pressure signal from the pressure sensor, detects an output of a main pump, and controls an output of an electric motor according to the output of the main pump based on a table stored beforehand.
1. A control system for a hybrid construction machine, comprising:
a variable-capacity main pump;
a circuit system which is connected to the main pump and includes a plurality of control valves;
a regulator which controls a tilting angle of the main pump;
a pilot flow path which is provided in the circuit system and introduces a pilot pressure generated when any one of the plurality of control valves is switched to the regulator;
an electric motor;
a variable-capacity sub-pump which is connected to a discharge side of the main pump and driven by an output of the electric motor;
a regulator which is provided in the sub-pump and controls a tilting angle of the sub-pump;
a pressure sensor which is provided in the pilot flow path and detects the pilot pressure; and
a controller which is connected to the pressure sensor, controls the regulator of the sub-pump in accordance with a pressure signal from the pressure sensor, detects an output of the main pump, determines whether a work state is a heavy working state or a light working state based on a detected output of the main pump, sets an output control value larger when the work state is determined as the heavy working state compared to when the work state is determined as the light working state, and controls the electric motor based on the set output control value.