Research On Powertrain Parameter Optimization And Control Strategy Of Dual Clutch Parallel-series PHEV

Shortage of resources and environment pollution that caused by the car are two major challenges which need to be solved in the development of the car industry.Plug-in Hybrid Electric Vehicle combines the advantages of pure electric vehicle and conventional vehicle,with good fuel economy,low pollution and no restricted driving range,etc.,that was believed to be a good method to handle these problems.In order to improve vehicle economy,parameters of powertrain were matched,the model of PHEV was built,torque management strategy was designed and the parameters of the vehicle were optimized.According to the vehicle performance requirements,structure trait and the basic working mode of the powertrain were analyzed,parameters matching process was developed and parameters were designed.Engine model,ISG motor model,the motor-driven model,battery model,driver model,clutch model dynamic model of the PHEV were built in the GT-SUITE environment,which combined theoretical modeling and experimental modeling method.Vehicle controller unit of the PHEV was built in Matlab/Simulink software,including mode recognition and torque management.Validating the PHEV model by simulation,which turned out that the model could be used for research,which provided the necessary simulation platform for the designation of torque distribution strategy and optimization of the powertrian.In order to address poor adaptability of rule-based torque distribution strategy for different driving cycles,fuzzy algorithm was introduced into this thesis and torque distribution based on fuzzy control was designed.For better fuel economic,on the base of previous theoretical and experimental research result of global optimization control strategy based on dynamic programming,theoretical SOC reference trajectory was introduced.That made SOC down to minimize just at the end of the driven distance and had optimal economy.Torque distribution includes a serial-parallel mode decision fuzzy controller,a fuzzy controller for parallel torque management and a series torque management unit.By introducing SOC and ?SOC to the controller input,which made the SOC fluctuated along with the theoretical SOC trajectory.Simulation results verify the feasibility of the torque distribution strategy.To overcome the problem of too many parameters of the powertrain and vehicle torque distribution strategy that affect the economy and intensive calculation,orthogonal experiment was designed to optimize vehicle parameters.Seven parameters that impact economic of the PHEV were chosen;according to the orthogonal experiment table simulation experiments were run.Analysis of range and variance were used on experimental results,obtaining effect of various parameters on fuel economic and the best economic parameters.Optimization and simulation analysis method that used in plug-in hybrid powertrain parameters and torque distribution strategy,which provides a reference in theoretical and simulation method to solve the problem of powertrian parameters matching,designation of the torque distribution strategy and achievement of best economic powertrain parameters.