Research On Driving System Control Strategy Of Electric Vehicle Based On Energy Consumption Per Kilometer

Battery electric vehicle(BEV)has attracted wide attention due to their advantages of zero pollution,zero emission,low noise,etc.However,the problem that the driving range of BEV is short owing to the huge electric energy consumption of the driving system restricts the development and popularization of the BEV.To solve this problem,a certain type of BEV is taken as the research object,and the control strategy of BEV driving system is studied for the purpose of reducing the energy consumption per kilometer.First of all,the construction and control principle of BEV driving system are introduced.Then,a certain type of BEV is taken as the research object,and the experiment and analysis of energy consumption of BEV driving system based on driving cycle and accelerating process are carried out.The results show that the speed and acceleration of different acceleration ways have a great impact on electric energy consumption of BEV.Then,the mathematic model of energy consumption per kilometer for BEV is established.The relationship between different accelerative ways,maximum torque per ampere of permanent magnet synchronous motor(PMSM)and energy consumption per kilometer is analyzed.Second,the mathematic formula between driving intention coefficient,accelerative terminal speed,acceleration and accelerative time is derived,and an optimal design method of BEV acceleration curve is proposed based on energy consumption per kilometer and driving intention,and the acceleration curves of multiple working conditions,different accelerator pedal opening and the rate of opening change are optimized.Then,according to optimal design methods of the acceleration curves and the control principle of PMSM maximum torque per ampere,the control strategy of PMSM maximum torque per ampere based on optimal acceleration curve is designed.On the basis,the control strategy of BEV driving system based on energy consumption per kilometer is established and the fuzzy controller that recognizes driving intention coefficient through the accelerator pedal opening and the rate of opening change is designed.The mapping relationship between the accelerator pedal opening and the accelerative terminal speed of grading speed control module is established.Third,taking a certain type of BEV as object,a simulation model of BEV driving system control strategy is established under Matlab/Simulink simulation circumstance.Based on this and under the starting,low speed,medium speed,high speed and ECE working conditions,the simulation and analysis of the driving system control strategy of the BEV based on energy consumption per kilometer are performed.Finally,based on a certain type of PMSM,load motor,NDAM data acquisition card and LabVIEW measurement and control software,etc.A driving system control experimental platform of the BEV is set up,which verifies the feasibility and effectiveness of the driving system control strategy of BEV based on energy consumption per kilometer.