Patent ID: 9228323
Filing Date: 2016-01-05
CPC Classification: E02F,F15B

Claim Text:
1. A control system for construction machine, comprising: a main pump; a circuit system which includes a plurality of operation valves connected to the main pump; a boom cylinder which includes a piston-side chamber and a rod-side chamber, and which is connected to a specific one of the plurality of operation valves; one passage which allows communication between the specific operation valve and the piston-side chamber of the boom cylinder; another passage which allows communication between the specific operation valve and the rod-side chamber of the boom cylinder; a hydraulic motor which rotates by the action of return oil from the piston-side chamber of the boom cylinder; a generator which generates power by a rotational force of the hydraulic motor; a battery which stores power generated by the generator; and a valve mechanism which introduces the return oil directly from the piston-side chamber of the boom cylinder through the one passage at the time of descent as a regeneration flow to the hydraulic motor, and introduces the return oil as a recovery flow to the rod-side chamber of the boom cylinder, if necessary, through the other passage.