Development of electro-hydraulic control valve for intelligent excavator

The working environment of the construction industry becomes harder and the operator qualities go lower. Moreover NFC (negative flow control) is one of the pump control types of the hydro-mechanical excavator, of which discharged flow rate of the pump is controlled by the pressure developed at the orifice of center-bypass line in a main control valve. In general, the NFC type excavator has some limitations in getting the high fuel efficiency and a good controllability. In order to solve these problems, we need an intelligent excavating system. One way to design an intelligent excavating system is converting the traditional-hydraulic system to an electro-hydraulic system. We are still in process, but we have developed the algorithms for the position control already, and also the remote control system is ready to test using the intelligent robotic excavator.