The Control Of Acceleration Slip Regulation For A Four Wheel Drive Hybrid Electric Vehicle

In recent years, the vehicle safety and energy problems become more and moreserious. People are seeking a new energy-saving vehicle after the development of theadvanced electronic control system, and the Hybrid Electric Vehicle (HEV) has beencreated. HEV is a transitional type, but it will occupy a long market cycle, so the HEVsubjects become new focuses, especially for the research on chassis electronic controlof HEV safety.HEV has special driving mode, its dynamics control and safety problems isworth discussing.With the promotion of the vehicle power performance, AccelerationSlip Regulation is very important for the acceleration quality, stability and safety. Thisthesis will explore the control of the HEV Acceleration Slip Regulation by analyzingthe traditional Acceleration Slip Regulation and HEV dynamics.It aims to implementthe control of Acceleration Slip Regulation for a4wheel drive HEV by coordinatedcontrol.First part of the thesis, the general development of HEV and the function of ASR,4WD are introduced, the research situation of the control of ASR for4WD vehicle isgiven, and the meaning of this project is elaborated.Secondly, according to the existing drive system of HEV, the arrangement fromof4WD HEV’s drive system is selected, and the related vehicle dynamic model isestablished by analyzing the working principle.Thirdly, according to the control method of ASR for traditional engine vehicle,the control strategy of ASR for HEV in different drive mode and power is formulated.These strategies are coordinated by logic threshold controller.Fourthly, the HEV ASR controller is designed, including motor, engine and brakecontroller. The control of ASR for single wheel HEV dynamic model is realized byPID control, and fuzzy control is to implement the self-tuning of PID controller. Study shows the fuzzy-PID controller of motor and engine can adapt to different roads, andhas a good character of robustness and stability.Fifthly, the control strategy of ASR for4WD HEV on different roads isinvestigated and formulated, then the HEV ASR controller has been used in thesimulation and dynamics analysis of4WD HEV on typical roads.Results show theHEV ASR controller can improve the drive performance effectively.At last, some conclusions educed in the researching process of this thesis aresummarized. Furthermore, the aspects which should be strengthened for the furtherresearch are put forward too.