Research And Simulation Analysis Of Electric Vehicle Acceleration Slip Control Algorithm

Four-wheel independent drive electric vehicle due to its ideal drive mode and broad application prospects has become a research hotspot of electric vehicle among numerous research directions. Many countries, especially in some developed countries have been impressive in the relevant fields.Acceleration Slip Regulation system as a typical active safety control technologies to improve the safety of cars, handling stability and driving acceleration is significant, its development is getting more and more the world's attention in recent years.In this paper, four-wheel independent drive electric vehicle Acceleration Slip Regulation system is the object of study, we study the control method of the road identification based on fuzzy theory to identify wheel optimal slip ratio, and design different control algorithms to study their control effects on different roadsThis paper first roughly introduces the development status and control theory of four-wheel independent drive electric vehicle Acceleration Slip Regulation system, and then draw on existing research results, through my own analysis, I have established 7-degrees of freedom vehicle model, Dugoff tire model and motor model;Secondly, we use the 4WID vehicle characteristic of driving torque can be independently controlled, speed and torque can be readily available,studied in real-time based on fuzzy theory to estimate the road surface friction coefficient and optimum wheel slip ratio method,laid the foundation for the effective implementation of ASR control system;Again, after comparing the various control algorithms,we designed the slip rate control algorithms based on PID and fuzzy PID for wheel slip ratio control, to keep it at optimum slip ratio;Finally, we use the powerful Simulink software to establish each subsystem model, through connection,operation, complete vehicle ASR control system in three common road.The results showed that:(1) The ASR control system based on fuzzy theory of road identification can keep wheel slip ratio in the optimum slip ratio, inhibition drive wheel slip to improve the power and directionalstability of EV.(2) two control algorithms are able to get good ASR control effects, but relative to the PID, the fuzzy PID has better adaptability and robustness.