Control Strategy Design And Simulation Research Of The Battery Electric Vehicles (BEV) Braking Energy Feedback Based On ADVISOR

Under the double pressures from energy resource and environment protection, there are new contents and orientations in the development of auto industry. With depleting of oil resource and worsening of greenhouse effect, nowadays, those traditional fuel automobiles being used in road have sparked a number of topics. More and more attentions are being paid to the economical and green automobiles resorting to new energy. At this moment, although the hybrid power types, which belong to the hottest research area, are obviously more economical than the traditional ones, they still depend on oil and release pollution gases into atmosphere. The BEV only resort to electrical energy, which are quite economical with zero emission. With the powerful supports of policies, funds and technologies from different national governments, the BEV technology is under continuous development. It is convinced that the popularization of BEV will come into reality.Despite the tremendous advantages of BEV being economical and environment-friendly, we cannot ignore their disadvantages: limited driving range, high battery cost, even weaker dynamic property than the traditional vehicles and so on. This article focuses on the braking energy analysis of recycled vehicles in driving process, discussing the control strategy of braking energy feedback and simulating this process, in order to enhance the driving range of BEV.The control strategy of braking feedback includes investigating how to distribute the motor regenerative braking force and traditional friction braking force, and taking the customer'feelings when braking into account on the premise of good braking efficiency. This paper will analyze the braking energy feedback, including six sections. In the first section, based on the introduction of topic background and research meanings, the electric automobile development is discussed and the significance of feedback control to electric automobile performance is presented. The second section mainly discusses the fundamental principles of feedback of braking energy recycle and major factors affecting the braking feedback efficiency. According to the research aim, the third section determines driving system structure of model vehicle and structure schematic of braking feedback system, analyzes the distribution principle of braking force, and establishes new control strategy of braking energy feedback and the logic control schematic of it. In accordance with specific component parameters, the fourth section analyzes the mathematic relation and conducts modeling of key components of braking feedback system under the ADVISOR condition. In the fifth section, the BEV simulation parameters are set up, different operating modes of braking are selected and the simulation of this dynamic co-simulating model is conducted. After analysis of a series of emulated data and curves from the simulation results, the braking feedback efficiencies of real vehicles with selected control strategy are verified, in comparison with simulation results. We can draw a conclusion that according to the new control strategy of braking force distribution established by this article, motor braking and hydraulic braking can work coordinately and ensure the braking security and stability with satisfactory result of braking energy recycle, considering many factors affecting the braking energy recycle process. The sixth section summarizes the whole work, analyzes the shortcomings and future directions, and discusses the issues considered in next step.