| The research object of this paper is pure electric racing car.Matching and optimizing the power system parameters of the car according to the competition items and the performance requirements of the whole car.And the actual vehicle test was carried out.The main research contents are as follows:(1)This paper introduces the power system structure and transmission system layout of electric racing car,and establishes Simulink models for calculating the maximum speed and acceleration performance of the car.The factors affecting the dynamic performance of the car are analyzed,and the calculation method of the economic performance of the car is given.And the characteristics of the powertrain components are also analyzed.These establish the basis for the matching of the parameters of the power system.(2)In combination with the requirements of the dynamic racing event of the car,and in order to meet the dynamic performance of the car and the endurance mileage,the constraints of the various components of the power system and the vehicle are analyzed,and initially match the parameters for the power system of the car.(3)Based on the Zhuhai New Circuit,the FSEC endurance race condition is created with the track simulation software OptimumLap.The simulation software CRUISE and Matlab/Simulink are used to establish the vehicle model and control strategy model of the car.The rationality of the model is verified and the joint simulation is carried out.According to the simulation results,the dynamic and economic performance of the car is analyzed,and it is verified that the matched power system parameters can basically meet the performance requirements of FSEC pure electric car.(4)The orthogonal test method is used to optimize the power system parameters,and the basic theory of orthogonal test method is studied.The extreme value analysis method is used to calculate and analyze the simulation results,and the optimal matching scheme is obtained.Comparing and analyzing the performance of the optimized car before and after the optimization.The simulation results show that the optimized pure electric car has reduced energy consumption by 4.54% under FSEC cycle conditions,and the dynamic performance has also been improved,with the 75 m linear acceleration time reduced by 7.8%.(5)According to the racing competition project,the real vehicle test is carried out on the maximum speed of the car,the acceleration performance of 50 ~ 80km/h,the linear acceleration time75 m,endurance mileage and durability efficiency.Through the comparison and analysis of actual vehicle test data and design indicators,the dynamic performance of the car can meet the design requirements,and the endurance mileage can also meet the demand of 22 km design indicators.There is a small error between the battery SOC value and the simulated value.The error is mainly due to the test environment and the influence of processing error. |
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