Research and Simulation Analysis on Dynamic Matching Characteristics of Electric Vehicle Transmission System

1. Research and Simulation Analysis on Dynamic Matching Characteristics of Electric Vehicle Transmission System 作者：张程 Lei Zhang, Zeqi Wang, haixin Zhao, Xiumin Yang

2. INTRODUCTION • Compared with traditional fuel vehicles, electric vehicles have higher requirements on the transmission. Currently, analyzed from the actual operation of some new energy passenger cars, motors relying on its own speed governing are far from meeting operating requirements of vehicles. Vehicles require great torque in starting and climbing, and the power demand when vehicles are running at high speed and their higher rate of energy conversion need to be guaranteed in this process. • In this paper, the key technology of the CVT matching can be studied by analyzing the relation between the key components parameters in the electric vehicles’ powertrain transmission system and the vehicle performance. Reasonable matching the parameters of electric vehicles’ key components, which can play its role effectively .The matching also had a significant impact on improving vehicle power, economy, ride comfort as well as endurance mileage.

3. 2 Dynamic System Model and Simulation of Electric Vehicle In this paper, the E520 type pre-propulsion is chosen as the object of study. According to the characteristics of this vehicle, using the software CRUISE in the AVL, the battery module, motor module, EMCVT module, MATLAB API module, driver module and wheel module were dragged in to the CRUISE working area. Simultaneously, brake control function, drive control function and a constant unit module were established. After selecting the subsystem modules, mechanical connection and the electrical connection have been connected between the modules according to the configuration scheme of the vehicle and the connection relation between the components, as is shown in Figure 1.

4. 2 Dynamic System Model and Simulation of Electric Vehicle

5. 2 Dynamic System Model and Simulation of Electric Vehicle 2.1 Motor characteristics Experimental data processing and modeling According to the data tested from the motor test bench under the rated voltage and rated working condition, the external characteristics curve and the efficiency characteristics diagram of the motor and the controller by using MATLAB can be obtained.

6. 2 Dynamic System Model and Simulation of Electric Vehicle

7. 2 Dynamic System Model and Simulation of Electric Vehicle 2.2 Battery Model Single battery model Releationship between voltage and SOC when charge and discharg

8. 3 Matching Model of Continuously Variable Transmission and Motor The powersystem performance of the electric vehicle loaded with EMCVT (Electro-mechanical Continuously Variable Transmission) is mainly depending on two factors. (1)The power matching between the motor and the CVT. (2)The speed ratio matching between the motor and the CVT. 3.1 Mathematical Model of Axial Clamping Force of Main and Driven Pulley

9. 3 Matching Model of Continuously Variable Transmission and Motor 3.2 EMCVT speed ratio control strategy CVT drive system control model

10. 4 CONCLUSIONS Electric vehicles have a higher demand for the transmission, and power matching and speed ratio matching are the two core technology issues of electric vehicle power system which introduces CVT, determining the vehicle's dynamic performance and economic performance. The later experimental results showed that the theoretical model established in this paper can reflect the actual operation of EMCVT and meet the control requirements.

11. ACKNOWLEDGMENTS This research was supported by the science and technology funds from Liaoning Education Department (serial number: L2015375) Thank you for yourattention.