A METHOD FOR CONTROLLING A HYDRAULIC SYSTEM OF A WORKING MACHINE

摘要

A method is provided for controlling a hydraulic system of a working machine, which hydraulic system includes a first hydraulic machine for providing hydraulic fluid to a first actuator of the working machine, and a second hydraulic machine for providing hydraulic fluid to a second actuator of the working machine and for providing hydraulic fluid to the first actuator. The method includes using a first control mode, and in the first control mode allowing a flow of hydraulic fluid from the second hydraulic machine to the second actuator, wherein the pump pressure of the second hydraulic machine is selected based on the load pressure of the second actuator independently of the load pressure of the first actuator. The method further includes using a second control mode provided that the requested flow to the first actuator exceeds a predetermined threshold value, and in the second control mode allowing a flow of hydraulic fluid from the second hydraulic machine to the first actuator, wherein the pump pressure of the second hydraulic machine is selected based on the highest value of the load pressure of the second actuator and the load pressure of the first actuator.