Patent ID: 9664209
Date: 2017-05-30
CPC Classifications: E02F,F01B,F15B

Claim:
1. A control system for a hybrid construction machine, comprising: an operation valve for operating a boom, the operation valve being adapted to control a boom cylinder; a variable displacement type of a fluid pressure motor for regeneration, the fluid pressure motor being rotated by means of a return fluid discharged from the boom cylinder at the time of lowering the boom; a distribution mechanism adapted to adjust a flow rate of the return fluid to be distributed to the fluid pressure motor; a motor generator adapted to be rotated integrally with the fluid pressure motor; a variable displacement type of assist pump adapted to be rotated integrally with the motor generator; a distribution mechanism control unit adapted to control the distribution mechanism to maintain a lowering speed of the boom regulated in accordance with an opening amount of the operation valve; a tilt angle control unit adapted to control tilt angles of the fluid pressure motor and the assist pump; and a motor generator control unit adapted to