Research of excavators power controller for linde HPR02E1L open variable pump

ZHANG Xueqiang, ZHANG Feng, SUN Na, MENG Xiangfeng

(Mountain Reconstruction Machine Co., Ltd., Linyi 276024, China)

Abstract: Aiming at the problem that the poor performance of the power matching of excavator using linde HRP02E1L open variable pump, the working principle of HRP02E1L load sensing variable pump and the control strategy of engine speed and the loaded condition of the excavator working process were researched, and the power control method based on the engine speed following was proposed. Each element simulation model were constructed at simulink platform of matlab, according to engine actual speed and presupposed load speed and system loaded pressure, PID parameters was regulated and VD3 solenoid valve current decided to hydraulic pump power absorption was demarcated, as a result, the speed variation of the excavator operating process was stabilizing. The experimental result shows that the power controller can realtime monitor the engine actual speed and can control VD3 solenoid valve current precisely following engine speed, and the excavator can acquired good coordination and stability.

Key words: load sensing; Simulink; speed following; PID; VD3 solenoid valve current; power controller; power matching