Research On Performance Simulation And Experiment Of Regenerative Braking System For Hybrid Electric Vehicle With CVT

Hybrid Electric Vehicle (HEV) is a new style vehicle, which combines the excellent performance of conventional vehicle with low emission and high efficiency of Electric Vehicle. HEV is the most feasible clean vehicle in the near future.Regenerative braking (energy recovery braking) is one of key techniques for HEV, which has a direct impact on fuel economy, emission and vehicle security. During deceleration and braking, regenerative braking system will reverses its electric motor turning it into an electric generator for generating electricity from vehicle kinetic energy and potential energy, and supplying the whole braking forces or partial braking forces at the same time. Finally, electric energy is saved into the battery. Regenerative braking not only realizes the braking and deceleration, but also reduces fuel used and emission.Continuously Variable Transmission (CVT) can automatically change the speed ratio continuously, which can make engine work on the optimal fuel economy operation line or the optimal driving performance line so it can rise the fuel economy and improve driving performance and comfort, reduce the emission of engine when the vehicle is in driving situation, or disconnect the rotate speed of engine and the velocity of vehicle when the vehicle is in braking situation which can make the motor work on the most efficient region by adjusting the ratio of CVT to adapt to the rotate speed of motor, thereby reclaims energy mostly.This paper focuses on Mild Hybrid Electric Vehicle with ISG. Deeply theoretical research and system simulation on the regenerative braking system is completed, and the experiment system has been established. Finally the experiment of simulating the regenerative braking process is done. The main results include:1. Based on the dynamics analysis of the vehicle and braking force distribution of conventional vehicle and combined with the characteristic of CVT, a strategy for the braking force distribution and control of HEV which aim at assuring the vehicle security and high efficient energy recovery is proposed.2. Through the analysis of vehicle dynamics and experiment data, a regenerative braking system model is built. The simulation result of HEV regenerative braking system in different drive cycles shows that the strategy for the braking force distribution and control of HEV can meet the require of the vehicle security and high...