| The popularity of automobile as a means of transportation is getting higher and higher,the problem of oil resource shortage and environmental pollution is getting worse and worse,and in addition to the proposal of the national goal of carbon peaking and carbon neutrality,the research on efficient power transmission and transformation technology of automobile becomes more and more important.This paper discusses and analyzes the integrated optimization of power switching control threshold and switching delay characteristics of electromechanical hydraulic power coupled electric vehicles formed after electromechanical hydraulic couplings are loaded.Analyze and explain the structural composition of electromechanical hydraulic couplers and the mode switching principle of electromechanical hydraulic coupled power vehicles.Based on this,parameter matching design was carried out on the relevant components of the vehicle,and a mathematical model of the vehicle power transmission system was established using the matching parameters.In the selection of control strategy models,a rule-based control strategy was selected,and simulation was conducted by integrating AMESim,Isight,and Simulink to verify the effectiveness of the model.The vehicle control strategy is optimized by comprehensively considering the state of charge(SOC)of the battery and the deviation of the driving speed.The design optimization platform is formed by integrating Isight,AMESim and simulink software.The DOE analysis and Latin hypercube sampling method are used to select the relevant optimization variables,and the NSGA-II multi-objective optimization algorithm is used for optimization iteration to complete the optimization of the power switching threshold of the control strategy.To improve the universality of optimization strategies,various classic road conditions,including urban congestion,suburban areas,and highway road conditions,were combined to form a comprehensive road condition for optimization.The optimization results showed that the optimization degree of battery SOC was 3.70%,and the optimization degree of speed deviation was 4.18%.Both the vehicle’s following performance and battery SOC had been improved to a certain extent.The universality of the optimized strategy was verified by introducing various different road conditions.In order to solve the problems of vehicle driving stability and related component service life caused by excessive mode switching frequency during the driving process,a fuzzy control logic was designed to reduce the amplitude of changes in the inclination angle of the swashplate in the accumulator.Based on a rule-based control strategy,a delay control strategy was proposed.The analysis results showed that the design of the delay control strategy can ensure the performance of the entire vehicle while ensuring its performance,effectively reducing the issue of vehicle multimode switching frequency being too fast. |
