The Research And Develop Ment Of A Hybrid SUV Brake Energy Recovery System

Not only the environment, but also in energy efficiency have great advantages, so the development and application of electric vehicles become an important direction of development of automotive research. Electric car driven by electric power, has little pollution and energy-efficient during work, and has important strategic significance, so it became the project of developing countries, with the advance, exemplary, comprehensive and high-tech content. Since hybrid technology can recovery energy during braking and then use it, that can increased the energy efficiency from 60%-70% of the traditional internal combustion engine vehicles to more than 95%. Therefore, regenerative braking system has a very important influence for the green energy development of hybrid vehicles. For electrically driven vehicle, the drive motor is in the power generation state and becomes into the generator during the deceleration or braking, so that the part of the vehicle kinetic energy come into electrical energy stored in batteries and other energy storage unit, while producing anti-Tropsch torque and acting on the drive shaft to form a similar mechanical brake braking torque. The Application of this technology not only reduces the mechanical wear traditional mechanical brakes, improves the control system performance of the vehicle system dynamics, but also saves energy, increases the vehicle's mileage.This article conducts a research about the regeneration braking control system of the hybrid under this background. This paper carries out a detailed analysis and research of the brake energy recovery system at first, and then basis on this, studied the effects of the energy recovery efficiency and brake safety factor, at the premise of ensuring safety of automobile brake, improving the recovery efficiency of energy, so recovery more energy as far as possible. Specific contents are as follows:(1) analyzed overall structure of the arrangement of a hybrid vehicle, established the model of drivers, vehicles, engines, motors, batteries, clutches, transmissions, tires and others, and established the simulation model of each module in matlab/ simulink, and get a simulation test.(2) Analyzes the influencing factors of brake energy recovery of hybrid automobile, studies and discusses several common control strategies, such as static logic gate control strategy, the instantaneous optimal control strategy, global optimization control strategies and intelligent optimization control strategy, for this purpose, choosed to use the intelligent control strategy of fuzzy control, combined with the widespread use of PID control works, selected and designed to meet the requirements of PID fuzzy control.(3) For the requirements of the vehicle design, researched and developed control strategies, and establish a control model of brake energy recovery system in stateflow and verify the simulation model at the second chapter. And for the simulation results, optimized the control strategies.(4) Described in detail of the vehicle controller hardware, supported software of the hardware and brush writing program. And brushed write the design and developed control strategies into the vehicle controller for road tests, by comparing simulation results and analysis of the structure to verify the feasibility of the control strategy, effectiveness and practicality.