Regenerative Braking Technology Research And Simulation Of Pure Electric Vehicle

With the rapid development of vehicle industry, vehicle stock of the world rapid grows up. The negative impact of energy shortages, environmental pollution, global warming caused by automobile becoming more and more serious. As a new automobile, the PEV (pure electric vehicle) is the most effective way to solve the energy crisis and environmental pollution.The short driving distance of PEV is still the major problem that hinders the development of PEV Increase the capacity of the battery is the most effective way to solve driving distance of PEV However, battery energy storage technology will be no major breakthrough in the near future. So, driving range of PEV mainly relies on increasing energy utilization factor. A key breakthrough of energy efficiency of EV in technology is how reasonable and efficient change mechanical energy into electricity and stores it into the storage device.The subject based on the engineering project of pure PEV is to study the simulation of brake energy recovery system and the design of controller.Based on the understanding of domestic and international electric vehicle regenerative braking technology development status and trends on the basis of the regenerative braking technology, based on the principle of analysis, the paper further researches and designs of the circuit.In order to improve the utilization rate of regenerative braking effect, restrict factors, The paper puts forward the improved fuzzy control strategy, processing machinery brake and electric brake distribution between relations, and finally improves the energy recovery rate. Force analysis of PEV braking process and establish a dynamic model of the braking system based on some constraints of PEV braking energy recovery and simulation based on the simulation. Control strategy is making braking current constant and using PID controller to control D of DC/DC converter. Motor armature current can follow the brake pedal in the braking condition. Experimental results shows:(1) When the demanded braking force is less than the maximum braking force that motor can supply. PEV's braking force is provided by the electrical braking system. Comply with safety requests and constraints of brake, the greater the motor armature current, the greater the braking power, shorter braking distance and can recovery more braking energy.(2) When the demanded braking force is larger than the maximum braking force that motor can supply. PEV's breaking force provided the composite braking system, this system can supply much more breaking power and make the braking distance shorter but regenerate less braking energy.