摘 要

“十三五”规划纲要提出，实施新能源汽车推广计划，大力发展纯电动汽车和混合动力汽车。当前“充电不方便”、“续航里程短”、“动力性能差”以及“技术不成熟，质量和安全担忧”成为新能源汽车发展的软肋。因此，“十三五”期间在巨大的市场推动下，电动汽车在续航里程，经济性能，动力性能等方面要取得突破性进步。

本文参照电动汽车动力系统的设计方法进行了动力系统的设计。本设计首先根据给定的数据确定小车的总体参数，然后通过设定性能目标参数对动力系统结构类型和参数进行匹配。数据确认后，到整车仿真软件AVL CRUISE对其动力性和经济性进行仿真分析。最后，将仿真结果同理论匹配结果进行对比分析，得出仿真结果符合理论匹配设计结果，满足整车动力性、经济性的结论，从而验证了本设计的正确性、合理性。

关键词：动力系统 AVL CRUISE 经济性能 动力性能

Summary

The outline of the 13th Five-Year Plan proposes to implement the new energy vehicle promotion plan and vigorously develop pure electric vehicles and hybrid vehicles. At present ," inconvenient charging "," short range "," poor power performance "and" immature technology, quality and safety concerns "have become the weakness of the development of new energy vehicles. Therefore, during the 13th Five-Year Plan period, under the huge market impetus, the electric vehicle must make the breakthrough progress in the range, the economic performance, the power performance and so on.

According to the design method of electric vehicle power system, this paper designs the power system.This design first determines the overall parameters of the trolley according to the given data, and then matches the power system structure type and parameters by setting the performance target parameters.After the data is confirmed, the power and economy are analyzed AVL CRUISE the whole vehicle simulation software.Finally, the simulation results and theoretical matching results are compared and analyzed, and it is concluded that the simulation results accord with the theoretical matching design results, and satisfy the conclusion of the whole vehicle's and economy, thus verifying the correctness and rationality of the design.

Keywords: Power system AVL CRUISE economic performance Dynamic performance

Directory

Project 1

1 Introduction 1

1.1 Introduction to Electric Vehicle Power System 1

1.1.1 overall structure 1

1.1.2 working principle 3

1.2 Research at home and abroad 3

2 Power System Design 5

2.1 Vehicle Performance Index Analysis 5

Basic parameters and performance index of 2.1.1 vehicle 5

2.2 Parameter matching of electric vehicle power system 6

Design of Transmission Ratio of 2.2.1 Transmission System 6

2.2.2 motor parameter design 6

2.3 Design of components for power systems 7

2.3.1 Transmission Factor Parameter Selection 7

2.3.2 motor selection 10

2.3.3 Battery Selection 10

3 Electric vehicle layout 13

4 Simulation Analysis 16

4.1 Introduction AVL CRUISE v2015 simulation software 16

4.2 Modeling 17

4.3 Analysis of Dynamic Simulation Results 18

4.4 Economic Simulation Results 18

5. Conclusions 18

Acknowledgement 19

Project

1 Introduction

Introduction of Electric Vehicle Power System

1.1.1 overall structure

Like traditional cars, electric vehicles are also composed of power devices, chassis, body and electrical equipment. The two parts of the electric vehicle body and electrical equipment are basically the same as the traditional vehicle, and the transmission system in the chassis is simpler than the internal combustion engine vehicle. The main differences are the power plant and the multi-energy powertrain control system, auxiliary energy system and auxiliary control system needed because of the different power sources. as shown in figure i.

Fig .1 Electric vehicle power system device and related control system

The power device of electric vehicle consists of power battery and energy management system, motor (drive motor) and its control system.

Power battery and energy management system, also known as the main energy system, is equivalent to the fuel system of internal combustion engine vehicles. The function of power battery is to provide the energy energy management system needed for automobile operation to realize the monitoring of energy utilization, coordination control and energy regeneration control. Early energy management systems were simple, mainly for a watt-hour meter ‚ and by simple conversion, a rough display of battery power or the number of miles a car can travel. The current energy management system consists of sensor set (current, voltage and temperature, etc.), computer signal acquisition, processing and analysis module, multi-function display and control execution unit. When working, the sensor transmits the voltage, current and temperature information of each battery to the computer. The computer analyzes the battery according to the battery charge and discharge and life index type, determines the state of the battery, and directly controls the operation of the vehicle through the system controller, or tells the driver the following information through the multi-function display: system voltage, running mileage, how many miles can be travelled, system charge warning, whether there is a bad battery, the history of each battery, battery life estimation, etc. The use of advanced energy management systems can double the battery life. but the circuit is complex, the cost is expensive, and the chemical change of the battery during charge and discharge is extremely complex. it is quite difficult to accurately calculate and predict the residual power and life of the battery. at present, this technology is still developing.

motor (drive motor) and its control system, the motor is equivalent to the engine of an internal combustion engine vehicle; the motor control system is used to receive the speed, current information from the motor and signals from the brake operator, accelerator pedal, etc., and to transmit the control information to the main control system, and the information from the battery to the main control system, which further controls the torque required for the drive motor to emit the operation.

Multi-energy powertrain control system is used to control multi-energy electric vehicle (such as hybrid electric vehicle), including powertrain electronic control unit, control system network communication and interface.

Auxiliary energy super capacitor, energy storage flywheel function is to make up for battery power shortage. Store excess energy from power cells in a super capacitor or in an energy storage flywheel when the car is braking to slow down or running at low load, and release stored energy when speeding or speeding^[1].

1.1.2 working principle

The basic working principle of electric vehicles is shown in figure 1. The battery supplies power to the motor through the control system, and the electric energy in the motor is converted into mechanical energy power and transmitted to the transmission system, and finally to the driving wheel, so that the driving wheel rotates, and the traction force of the vehicle is generated through the interaction with the ground.

Main power supply