Computer Aided Design And Energy Consumption Simulation Of EV Driving System

At present,the aggravation of the pollution and the short of the petroleum have sounded the alarm bell to us.Facing the crisis,the automobile industry needs to adapt.Pure electric vehicle has no pollution,it is powered by electricity from motor.Besides,due to the electric energy is secondary energy,which can effectively promote the transformation of energy.The pure electric vehicle driving system has a direct impact on the performance,So,it is necessary to design the driving system reasonably.On the basis of determining the parameters and performance indexes of the vehicle,the design method of the main components of the driving system is proposed.Based on the method,the pure electric vehicle driving system computer aided design software is developed on the VC++6.0 platform.The software can not only realize the driving system design,but also can carry out the performance verification.Finally,taking the BYD e6 as an example to design the drive system,and the design result is consistent with the actual vehicle parameters,which shows the accuracy of the design method and software.Due to the limitation of battery technology,the energy consumption and the driving range of pure electric vehicles have become the main indexes to evaluate their performance.Based on the analysis of the working characteristics of the accelerator pedal,brake pedal,permanent magnet brushless DC motor and lithium iron phosphate battery,the mathematical models are established respectively.According to the mathematical relationship between the demand torque and the pedal stroke,the mathematical model of the accelerator pedal is established,which can output the demand torque signal to the motor model,which can accurately reflect the driving intention.According to the distribution rules of braking force,the mathematical model of brake pedal is established,which can guarantee the stability of braking,and output the required braking torque signal to the motor model.According to the relationship between the input current and the output torque of the motor,the mathematical model of the permanent magnet brushless DC motor is established,and the demand torque signal is received,and the demand current signal is output to the battery model.According to the current integration method and residual mileage,the lithium iron phosphate battery model was established.It can output current signal to motor model,and calculates the power consumption and driving range,can be used to evaluate the performance of the vehicle.The input and output parameters of each mathematical model are interrelated.Therefore,based on the VC++6.0 platform,using the visual interface of the software and the data transfer function,the relationship between the mathematical models is realized,and the function of energy consumption simulation is realized.Through the simulation of the designed BYD e6 driving system on the software,the power consumption of a hundred kilometers and the driving range are obtained under the condition of test cycle and simulation road actual road cycle.The results agree well with the measured data,which shows the correctness of the simulation software.According to the simulation of the actual road conditions,it is found that the energy consumption of pure electric vehicles is related to drive behavior.