Based Control System Features Dual Spool Excavator Boom And Energy-saving Research

Because of the increasing awareness of global energy crisis and environmental protection, human beings are looking for low-carbon production and lifestyles.Hence, especially for hydraulic excavator, how to improve the energy-saving efficiency of the construction machinery is of higher development potential project. Under this background, compared with LUDV system(German:Last Unabhangige Durchfluss Vereilung),this thesis takes hydraulic excavator's twin spool valve system as the project to develop and analyze the mathematic modeling of the asymmetric hydraulic cylinder system controlled by twin spool valve. Meanwhile, using combined simulation technology, further static and dynamic analysis and energy conservation research are progressed on the system application of twin spool valve on excavator.The research and status of the twin spool valve technology on energy-saving control of the excavator both abroad and at home are summarized. As most of the construction machinery's implementing mechanism are asymmetrical cylinders, it analyzes the working principle of the twin spool valve system and develops the twin spool valve asymmetrical cylinder system mathematical model.Furthermore, it also makes qualitative analysis of the static and dynamic characteristics and energy-saving situation of the system by Matlab programs.The results show that controlling the twin spool valve system's displacement ratio mi1,m2 of separate meter-in and meter-out valve are within the limit of the hydraulic cylinder's effective area ratio "n" between both rod end chamber and head end chamber, the system can attain good static and dynamic characteristics and maximum energy efficiency.It analyzes the internal structure and working principle of the main components of the twin spool valve system, and also presents that should unify the flow distribute method between CV (Conditioning Valve) of twin spool valve system and LUDV system. It develops the systematic dynamics model of excavator in Adams and the other two AMESim models of the arm of excavator system, which provides the foundation of the following simulation comparing LUDV system and twin spool valve system.It analyzes simulation results of the LUDV system and twin spool valve system of the excavator respectively, and study the effects caused by changing the LUDV system orifice areas ratio and the displacement ratio of the meter-in and meter-out valve of the twin spool valve system, which includes pressure response and displacement response of the excavator arm system and the energy consumption on the basis of above. The simulation results verify the theoretical analysis of twin spool valve asymmetrical cylinder system, and provide the instructive theoretical basis and the control method to research the twin spool valve technique. What's more, the thesis also builds the energy regeneration system simulation model of excavator to save the arm potential energy on the basis of twin spool valve technology, which would provide the relative controlling data of the further experiment research.For obtaining a more accurate simulation model and comparing the simulating data validation, it builds two sets excavator testing platforms with LUDV system and twin spool valve system. Experiment results show that all the models and simulation data are right and credible, and also verify the correctness of the theoretical analysis of twin spool valve asymmetrical cylinder system.