Research On Brake Energy Recovery Control Of Pure Electric Vehicle Based On IBooster And ESC

The Chinese government has regarded the development of new energy vehicles as a national strategy and issued a series of policies to promote the development of the new energy vehicle industry.The pure electric vehicle has the advantages of no emission and low noise,and is suitable as a vehicle for office workers traveling in the city.According to statistics,under urban operating conditions,about 1/3 to 1/2 of the energy of the vehicle is consumed in braking,and the braking system of pure electric vehicles has the feature of energy recovery,and part of the kinetic energy can be converted into electrical energy during braking.Reduced the energy consumption of vehicles per 100 kilometers,thereby increasing the driving range.The braking energy recovery of a pure electric vehicle is affected by the motor and the battery.At the same time,the effect of the regenerative braking of the motor on the original hydraulic brake of the vehicle raises new problems for the existing automobile theory.This article focuses on the research of the previous pure electric vehicles,focusing on the i Booster electronic mechanical booster instead of the vacuum booster,the braking force distribution strategy in the braking energy recovery process,the coordinated control of the motor regenerative braking and ESC hydraulic brake,etc The work is as follows:First of all.This article establishes the i Booster electromechanical booster model,including the booster motor model and the booster transmission model.The basic boosting principle is analyzed.The standard vacuum booster and the i Booster electromechanical booster are controlled for basic boosting,and the boosting characteristics of the vacuum booster are realized.Second,the establishment of a pure electric vehicle model,motor model,battery model,driver model,ESC hydraulic control unit model can control the driving and braking of pure electric vehicles under different working conditions.Then,the braking force distribution strategy in the process of braking energy recovery was formulated,divided into braking force distribution strategy based on ECE regulations and traditional fixed ratio braking force distribution strategy.At the same time,a coordinated control strategy for motor regenerative braking and ESC hydraulic braking was formulated.According to the above strategy,pure electric vehicles are simulated and analyzed under different working conditions.The results show that under the condition of meeting the braking requirements,the regenerative braking of the motor and the hydraulic braking can be coordinated and the braking energy recovery efficiency is high.Finally,the anti-lock control of the ESC hydraulic control unit adopts double logic thresholds,and the coordinated control strategy of the motor regenerative braking and the ESC hydraulic brake in the anti-lock process of the wheel of the pure electric vehicle is formulated and carried out.Simulation analysis,while ensuring the safety of braking under the control strategy of this paper,improve the efficiency of braking energy recovery.