Research on Dual-Valve Parallel Collaborative Control Strategy for Electro-Hydraulic Systems

With the development of modern industry, electro- hydraulic actuators (EHAs) have been widely applied in various fields such as aerospace, maritime, and heavy machinery. Consequently, performance testing and optimization of EHAs have become increasingly important. Traditional loading performance tests for electro-hydraulic actuators face challenges such as difficulty in replicating experiments, time and labor intensity, and limited accuracy in detecting the actuator's loading performance, complicating the entire testing process. To address these issues, designing an electro-hydraulic actuator load simulation system for performance testing has become an effective method for enhancing actuator performance. The primary task of this load simulation system is to accurately replicate the loading forces experienced by the actuator during real-world operational conditions. Electro-hydraulic actuators operate under a variety of motion conditions, one of which involves high-speed movement with small load forces during the process and large load forces at the endpoint. Under such conditions, the high speed of the actuator causes excessive flow, which reduces the loading performance. To mitigate the issue of high flow, the simulation loading system employs a parallel structure of high-flow and low-flow servo valves, and proposes a dual-valve collaborative control scheme based on Direct/Indirect Adaptive Robust Control (DIARC) and flow compensation. This approach enables compensation and adaptive distribution of system flow, significantly improving the loading accuracy and response speed of the system.