Research On Multi-objective Optimization Of Powertrain System Parameters For A Certain A-class Car

Based on the support of an enterprise research project,the study,which intends to enhance the overall performance of a certain A-class car in power,fuel economy and emission,aims to build a stimulation model through the optimization analysis of vehicle powertrain system.The experiment verifies the reasonability of the simulation model,resulting in a parameter optimization plan for the powertrain system of the A-class car.Besides,it adopts a stimulation method to make multi-objective optimization,which finally tests and evaluates the optimized parameters matching scheme of the powertrain system.The result indicates that both of the power performance and fuel economy of the A-class car are improved after the optimization.The main contents of this study are as follows:Firstly,the study initially selects parameters of the powertrain system on the basis of the performance evaluation index of a certain A-class car in power,fuel economy and emission.Secondly,via the software AVL-Cruise,the study aims to build a dynamical stimulation model based on the stimulation and optimization of the A-class car powertrain system.According to the initial parameter of the target car type,it then does stimulation calculation,the results of which are compared to those of the whole vehicle experiment so as to verify the accuracy of the model and therefore,it lays the foundation for multi-objectives optimization of powertrain system parameters for the A-class car.Thirdly,the study researches on the powertrain system parameter optimization and simulation for the A-class car.It intends to optimize the engine accessorie and adopts genetic algorithm for optimal design of speed ratio since it aims at improving performance in power and fuel economy.The study then optimizes the shift schedule for the car based on economic considerations.The simulation optimization result satisfies the goal of the study.Finally,considering the environmental factors,experimental verification are used for the optimized powertrain system matching plan to prove the feasibility of the performance evaluation index,the results of which are compared to stimulation results.In addition,it provides an experimental basis for the final multi-objective matching plan of the powertrain system parameters.