中型挖掘机泵控系统与阀控系统的能效对比OA北大核心CSTPCD

In order to reduce the energy consumption of conventional hydraulic excavator,a distributed direct-drive hydraulic system with a single variable pump-controlled cylinder is proposed.Taking a medium hydraulic excavator as a test case,pump-controlled technology is adopted to replace the dual-pump dual-circuit valve-controlled technology.Firstly,the principles of the valve-controlled system and the proposed pump-controlled system are analyzed.Subsequently,mechanical models,hydraulic system models,and a speed feedback PID position feedback controller are established and combined in MATLAB/Simulink.Experimental tests for the valve-controlled system and simulations for the pump-controlled system are conducted under the same excavation cycle conditions.The results indicate that under aidentical operating condition,the energy consumption of the working apparatus in the two systems is fundamentally similar(pump-controlled system is 8.6％higher than valve-controlled system);However,the efficiency of the pump-controlled system at 62.1％is 2.6 times that of the valve-controlled system at 23.5％.As a result,the total energy consumption of the pump-controlled system is lowered by 62.4％.