Patent ID: 9670944
Date: 2017-06-06
CPC Classifications: E02F,F03C,F04B,F15B,Y10T

Claim:
1. A control system for a work machine comprising a hydraulic machine and at least one hydraulic cylinder, wherein a first port of the hydraulic machine is connected to the hydraulic cylinder via a first line, a line that connects the first port of the hydraulic machine and a tank, an electric machine arranged to drive the hydraulic machine, control means arranged in the line to drain the first port of the hydraulic machine, and a control unit programmed to detect that a lifting movement of the implement is to be initiated and, after detecting that a lifting movement of the implement is to be initiated, before the lifting movement takes place by supplying fluid to the hydraulic cylinder, control the control means to provide a leakage flow from the hydraulic machine so that a basic speed of the hydraulic machine is attained, wherein the hydraulic machine is connected to a piston side of the hydraulic cylinder via the first line and a piston-rod side of the hydraulic cylinder via a second line, the hydraulic machine has a second port which is connected to the piston-rod side of the hydraulic cylinder via the second line, and the hydraulic machine is arranged to be driven in two different directions, with one direction being associated with a flow out from the first port and the second direction being associated with a flow out from the second port.