Aiming at problems of high energy consumption,nonlinear friction and steering engine's movement disturbances in valve-controlled electro-hydraulic load-simulation system,a double-pump-controlled scheme was proposed,and the sliding mode control was adopted to ensure the robustness of system.The mathematical model of double-pump sub-chamber control electro-hydraulic load-simulation system was established.On this basis,aiming at problem of poor dynamic characteristics of the single-pump control system,force-total pressure compound control strategy was designed to make it have similar dynamic characteristics as the valve-controlled sys-tem.For the poor tracking effect problem caused by the chattering of traditional sliding mode control,an equivalent sliding mode control-ler based on fuzzy reaching law was proposed,and its stability was analyzed theoretically.Finally,through co-simulation,the feasibility and effectiveness of designed control strategy and controller were verified.The results show that the proposed compound control electro-hydraulic load-simulation system has good tracking effect and it can significantly reduce the system energy consumption.
关键词
负载模拟/双泵分腔调控/滑模控制/复合控制/模糊趋近律
Key words
load-simulation/double-pump sub-chamber controlled/sliding mode control/compound control/fuzzy reaching law
维普
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