Advisor-based Control Strategy Study On Regenerative Braking System Of Hybrid Electric Vehicle

Hybrid electric cars combine the merits of the conventional internal combustion engine vehicles and electric vehicles, it maintaines good momentum and meanwhile reduces the pollutants from vehicle emissions effectively compared with the conventional vehicles.Therefore, in promoting energy conservation today, its development represents the direction of new generation cars development in a longer period of time in the future. Regenerative braking, is a key energy-saving technology of hybrid electric cars. It can slow down or brake the vehicle during vehicle braking performance.Under ensuring the braking conditions, the vehicle kinetic energy through the drive motor power or position, is converted into electrical energy storage In the cell to achieve energy recovery, and generat all or part of the vehicle braking force required.Taking into accounts that the motor recovery of braking energy is changed by a number of implications. In order to ensure the braking safety and stability, the current hybrid electric vehicles introduce the hydraulic brake motor braking under the premise of conventional braking system, it means that the regenerative braking and hydraulic braking systems should work together. So, how to distribute conventional braking and motor braking is the key technical issues.In this paper, we selecct hybrid electric cars Red Flag CA7220E for the study subject. After analysising braking system working features of hybrid electric cars, we fit out a multi-stage fixed proportion of braking force distribution group lines from the ideal braking force distribution curve. The recovery of braking energy is affected by various factors, based on these factors, we change the Advisor own regenerative braking force distribution module, and raise a new braking force distribution strategy. Combined multi-stage fixed proportion of braking force distribution group lines, and under different braking braking strength, we modeling key components(Vehicle, wheel, main gear box, transmission, engine, motor, battery) of the regenerative braking system in the Advisor. Then select different braking conditions, and make simulation under the dynamic simulation model. After analysising the data and curves after a series of simulation, it can be concluded that the new vehicle braking force distribution control strategy this article discussed can get a higher recovery of braking energy efficiency, so it can give the reference for the real car integrated control strategy and give some guidance for the bench and real vehicle test.