6Mannsann Rexroth.Hydraulic components for general industry.RE 00 177/01[R].Loht am Main,Germany:Mannsann Rexroth,1998.
7Bradley D A,Seward D W.The development,control and operation of an autonomous robotic excavator[J].Journal of Intelligent and Robotic Systems,1998,21:73-97.
8Hagam Hiroshi W,Fujishima K.Digging control system for hydraulic system[J].Mechatronics,2001,11:665-676.
9Koivo A J,Thoma M,Kocaoglan E,et al.Modeling and control of excavator dynamics during digging operation[J].Journal of Aerospace Engineering,1996,1:10-18.
10Chang P H,Lee S J.A straight-line motion tracking control of hydraulic excavator system[J].Mechatronics,2002,12:119-138.