Research On Coordinated Control Strategy Of Electro-hydraulic Compound Braking For Pure Electric Vehicle Based On Advisor

The car has produced a huge push effect on the progress of human society,and the world’s car ownership is also increasing.However,the rapid development of the car has also brought troubles to mankind,especially the environmental pollution problems and energy shortages.Pure electric vehicles with its huge advantages of energy saving and environmental protection,has become the research and development hot spots of country’s auto industries.Pure electric vehicles have some shortcomings in its popularization,the most prominent one is the short recharge mileage.Battery research and development technologyis difficult to get a breakthrough in the short term.Therefore,the development of more efficient energy recovery strategy,which use regeneration brake as much as possible in the pure electric vehicle braking process to recycle more braking energy to improve the recharge mileage of pure electric vehicles,has a high theoretical significance and practical value.In this paper,the ADVISOR pure electric vehicle is chosen as the research object,and the electro-hydraulic composite braking system coordinated control strategy is made based on ECE regulations,And the space vector model of the permanent magnet synchronous motor and the hydraulic braking system model are established.The next few points are the main research content:1)This paper introduces the characteristics and basic structure of pure electric vehicle,analyzes the principle of regenerative braking and the main factors influencing its braking energy recovery.2)The dynamic analysis of pure electric vehicle braking process is carried out and the theory of regenerative braking control is introduced briefly in this paper.The electro-hydraulic composite braking system coordinated control strategy which takes maximizing the energy recovery of the brake system as target is made based on the requirements of ECE regulationsand under the premise of satisfying the braking stability and safety.After the top-level strategy is established,the space vector drive system model of the permanent magnet synchronous motorand the hydraulic braking system model are established.3)The simulation model of pure electric vehicle in ADVISOR is analyzed,and the braking control strategy developed by this paper is compared with ADVISOR default control strategy.The results show that under the two conditions of NYCC and UDDS,the braking control strategy developed in this paper can recover more braking energy to improve the energy utilization of pure electric vehicles effectively compared with ADVISOR’s default control strategy under the premise of satisfying ECE regulations and braking performance.This can provide a theoretical basis in order to increase the recharge mileage of pure electric vehicles.After the top-level strategy verification is completed,the constant torque and step torque input are selected to verify the validity of the permanent magnet synchronous motor space vector drive system model and the 100 km / h and 60 km / h initial braking speed are selected to verify the validity of the hydraulic braking system in this paper.