【作者】 胡安平；

【导师】 王庆年；

【作者基本信息】 吉林大学 ， 车辆工程， 2008， 硕士

【摘要】 随着能源危机的加剧,混合动力汽车已经成为新一代汽车的发展方向,而再生制动技术作为混合动力汽车一项关键的节能技术,已经得到越来越大的重视,再生制动是指汽车在制动过程中将其一部分动能转化成其它形式的能量储存起来的过程。考虑到电机的制动能量回收率和制动稳定性两方面因素,当前的混合动力汽车大都采用电液制动相结合的再生制动方案,即在保留原有液压制动的基础上将电机引入制动系统,使能量回收制动和液压制动系统协同工作。因此,如何使摩擦制动系统和再生制动系统协调工作并能最大程度回收能量就成了一项很关键的技术。因此,本文以红旗牌混合动力轿车CA7220E为研究对象,对混合动力轿车的再生制动系统进行研究。主要进行的工作有:1.对再生制动系统的工作过程进行了动力学分析,并对能量回收的基本原理和能量回收过程进行研究。2.根据混合动力轿车制动系统的工作特点,在参考三种典型制动力控制策略的基础上,提出一套新的制动力控制策略,使其能够在满足制动稳定性的前提下,最大程度进行能量回收。3.在AMESim环境下对再生制动系统关键部件(ABS液压控制单元、真空助力器、制动主缸、电机、电池、车轮)进行建模,同时建立15自由度整车再生制动系统动态仿真平台。4.根据提出的制动力控制策略,在Matlab/Simulink环境下建立该再生制动系统算法模型,包括制动力分配模型和ABS液压系统控制单元模型,并将该算法模型嵌入到整车动态仿真平台进行联合仿真。5.选取不同的制动工况,对该动态联合仿真模型进行仿真,验证本文提出的控制策略是否可行,并根据仿真结果,对模型中相应参数进行调整,使制动效果达到最优。更多还原

【Abstract】 Hybrid Electric Vehicle(HEV: Hybrid Electric Vehicle) has been a new orientation for vehicle as it combines the two advantages of low emission and low fuel consumption. As a key technology to reduce energy consumption, regenerative braking has been paid more and more attention. Regenerative braking is a technology to change one part of the vehicle’s kinetic energy to other forms of energy(such as electricity) or transfer this part of energy to other parts(such as Super High-speed Fly Wheel) to store it when braking. This part of the energy will be released when the vehicle drives or accelerates, so we can improve the vehicle’s fuel economy effectively.At the present time, the research about Hybrid Electric vehicle in our country is just in the beginning, so the study of regenerative braking system is relatively weak. Considering the braking performance and braking stability, most HEV utilize both hydraulic braking system and regenerative system at the same time, which reserve the intrinsic hydraulic braking system and introduce the motor into braking, so how to make the hydraulic braking system cooperate with the regenerative braking system on condition of the braking stability is a key technology for HEV. The regenerative braking system applied on HEV presently in our country have many problems, such as the hydraulic braking force can not be controlled accurately, the reduced energy is limited and so on. There is a gap between domestic and foreign regenerative braking system.Based on the achievement of our laboratory in the national“863”program of hybrid electric vehicle, this paper did some research about the regenerative braking system, combining with the actual demand of the hybrid electric vehicle”CA7220E”in the“eleventh Five-Year”. By consulting some domestic and foreign literature, we have acquired some results as following:1. Analysis was done about the working process of the regenerative braking system ,the HEV’s structure and the basic theory of the energy reducing. 2. After doing some analyses about the braking process of hybrid electric vehicle, we consulted three typical braking force distribution control strategies, combining with the actual demand of the HEV, and then we finally proposed a braking force distribution control strategy, which can improve fuel consumption effectively on condition of the vehicle’s braking stability. This strategy can meet the demand of the ECE braking law, and reduce braking energy effectively.3. A dynamic vehicle model for regenerative braking system has been built up based on AMESim in this paper, which includes some models for the key parts of the HEV braking system, such as the motor model, the battery model and the semi-empirical tire model and so on. The modeling course used theoretical modeling approach combined with mathematical modeling.4. An arithmetic model has been built under the environment of Matlab/Simulink, which include a braking force distribution control model and a sub-model for ABS hydraulic braking system.This are done based on the proposed braking force distribution control strategy. We can do a co-simulation with this arithmetic model and the dynamic vehicle model to assort the motor braking system with the ABS hydraulic braking system.5. Do simulation with the co-simulation model under different typical braking cycles(different initialized velocities,braking intensities and adherence coefficients). Adjust the parameters according to the simulation results. The results indicates that this HEV braking system can reduce the fuel consumption effectively on condition of the braking stability.It can reduce fuel consumption by 61.44% under condition of small braking intensity when the initialized velocity is 60km/h, and this validate that the model is reasonable and feasible.As one of the key technology of HEV, the regenerative braking system plays an important role in HEV study and research, the work of this paper will be a coaching significance for the further study of regenerative braking system.更多还原