Theoretical Research And Application Of Multi-hydrostatic-motor Transmissions

Hydrostatic transmission technology,with high power density,wide speed range,high efficiency,flexible layout,and easy to realize continuously variable transmission,reverse and brake,is widely applied in mobiling engineering mechanical driving system.Foreign related technology research has been very mature and used widely,but domestic research on this aspect is relatively backward.Now many mobile engineering machinery not only needs a certain output torque,but also need a certain speed.The traditional pump with single motor with variable speed drive units,speed range and output torque are subject to certain restrictions,and system efficiency is very low at high speed,not give full play to the potential of hydrostatic transmission.In order to expand the speed range of variable speed and output torque drives,improve the efficiency of system,this paper constructed a new type of hydrostatic circuit using two motors-‘multi-motor transmissions’.For the hydrostatic drive scheme,this paper uses the theoretical analysis,mathematical modeling and simulation analysis,the following work:Firstly,the working principle of main hydraulic components in circuit are analyzed,and three multi-motor transmissions are designed on the basis of the traditional hydrostatic circuit;then with a telehandler as the research object,selected the hydraulic components of three drivers respectively,and on the basis of the working condition of constant power matching parameters for three kinds of drivers;In order to improve the efficiency of the system,this paper making full use of the effective working range of each component.Secondly,through modeling and analysis of the system,the system is multiple input single output nature of nonlinear systems;Fuzzy-SMC controller is designed.Finally,the system model is built by using AMESim and MATLAB/Simulink software,the correctness of the driving scheme is verified by hydraulic simulation,the simulation results show that the system design meets the requirements;Then through co-simulation verify the validity of controller in the hydraulic system,the simulation results show that the controller has strong robustness and good dynamic quality.