Research On Powertrain Matching And Control Strategy Of Plug-in Hybrid Electric Vehicle

Facing the dual pressures of energy crisis and environmental pollution,energy saving and emission reduction is imperative.The development of new energy vehicles has become the strategic direction of China’s automobile industry.At present,the plug-in hybrid electric vehicle as a new energy vehicle research hot spots,not only retains the good power of the traditional vehicle,can also drive in pure electric mode.As well as the use of external power supply and the engine to achieve charge,can effectively improve fuel economy and reduce emissions.In this paper,the development of plug-in hybrid electric vehicle based on a medium truck is studied.As the research subject,the virtual simulation technology and experimental verification in the whole vehicle development process are studied.The main contents of power system parameter matching,vehicle control strategy,vehicle power performance,economy and optimization are as follows:(1)The layout scheme of power system is studied.According to the needs of the vehicle to meet the power,economy and pure electric mode mileage requirements on the basis of the existing vehicle parameters,the parameters design and selection of engine,power battery,drive motor and transmission are carried out.(2)Taking into account the actual operating characteristics of the vehicle and the applicability of the control strategy.According to the actual running state,the vehicle can be divided into different working modes.Real simulation of vehicle running mode based on rule based logic threshold control strategy.The basic state of the vehicle and the vehicle demand torque are used as the switching conditions between the models.Based on the Matlab/Simulink/Stateflow software platform,the vehicle control strategy is developed.(3)The vehicle model and key components is a key factor in achieving a reasonable simulation of the model.Based on the model of the motor model and the transmission model,the virtual simulation model of the vehicle is established,and the vehicle simulation platform is implemented with the vehicle control strategy.At the same time,combined with the actual road spectrum analysis in the running process of vehicle,simulation analysis of the dynamic and economic development models,and through real vehicle power and economic indicators to verify the rationality of development model and control strategy,the work lays the foundation for the subsequent optimization.(4)Transmission ratio is one of the key problems in power system matching.Based on the analysis of the influence of the power system components on the performance of the whole vehicle,the influence law of the vehicle gear box and the final drive on the dynamic performance and economic performance is studied.In order to meet the requirements of dynamic design,the DOE method is used to optimize the transmission ratio of the gear box and the final drive.