| A new type of power transmission device,variable AC synchronous electromechanical hydraulic coupler(hereinafter referred to as electromechanical hydraulic coupler),is proposed in Qingdao University.The electromechanical hydraulic coupling electric vehicle can be formed by using the electromechanical hydraulic coupling electric vehicle,which has more compact power plant and higher transmission efficiency.The research on the dynamic characteristics of electromechanical hydraulic coupling electric vehicle is very important for product design.This paper focuses on the matching of dynamic parameters,the formulation of control strategy and the electro-hydraulic dynamic characteristics of electromechanical hydraulic coupling electric vehicle.The matching analysis of the powertrain is completed.According to the characteristics of electromechanical hydraulic coupling electric vehicle,a set of powertrain is designed.After the vehicle parameters and dynamic performance parameters of the vehicle are determined,the parameters of the power components are matched to ensure the coordinated and stable operation of the electromechanical and hydrodynamic coupling electric vehicle under various working conditions.The electromagnetic system of the well matched powertrain is simulated.According to the specific parameters of the electromechanical hydraulic coupler electromagnetic system,the simulation model is established in Maxwell and the simulation calculation is carried out.The calculated torque diagram proves that the designed structure can meet the requirements of the maximum driving torque.It can be seen from the electromagnetic loss diagram and efficiency diagram that the loss and efficiency are within a reasonable range under most stable operating conditions.The structure of the electromagnetic system designed can meet the power demand of electromechanical hydraulic coupling electric vehicle.The correlation efficiency of hydraulic power is studied.The dynamic characteristic equation of the hydraulic system with electromechanical hydraulic coupler was analyzed.According to the structural parameters of the hydraulic system,the mechanical efficiency and volumetric efficiency were analyzed and calculated.The variation curve of the compound efficiency with the output pressure at rated speed was obtained.The whole powertrain is studied by co-simulation.According to the designed transmission system of the electromechanical hydraulic coupling electric vehicle and the parameter matching of the power components,the simulation model of the electromechanical hydraulic coupling electric vehicle was established in AMESim,and the control strategy of the vehicle was established in the MATLAB/Simulink environment to analyze the operation characteristics of the vehicle driveline under various working conditions.In the NEDC cycle condition compares the result with actual operation results and expected the analysis,the simulation results show that the established model and strategy is feasible,the car can reach a predetermined running state,the hydraulic system in the aspect of braking energy recovery effect is more noticeable,battery energy loss at the NEDC condition compared with pure electric vehicles by 13.7%. |
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