Patent ID: 9441648
Filing Date: 2016-09-13
CPC Classification: E02F,F15B

Claim Text:
1. A control system for hybrid construction machine, comprising: a first main pump and a second main pump; a first circuit system connected to the first main pump via a first supply passage; a second circuit system connected to the second main pump via a second supply passage; a hydraulic motor connected to the second main pump; a motor generator adapted to be rotated by a drive force of the hydraulic motor; an assist pump adapted to be rotated by a drive force of the motor generator; a joint passage connected to the assist pump and branching off at an intermediate position into one branch passage and another branch passage; a first logic valve disposed between the one branch passage and the first supply passage; a second logic valve disposed in the second supply passage; a switching valve disposed in the other branch passage and switchable to a state where the assist pump is connected to the second supply passage on the upstream side of the second logic valve and a state where the second main pump is connected to the hydraulic motor; and a bypass passage further branched off from the other branch passage at a side downstream of the switching valve, wherein the bypass passage is connected to the second supply passage on the downstream side of the second logic valve.