| Due to its configuration characteristics,the hybrid system with series/parallel configuration takes into account both the advantages of series configuration and parallel configuration,and has better energy saving and emission effect,simple structure design and convenient control execution.Therefore,it has become one of the most popular configuration forms in the hybrid configuration.This paper planned to develop vehicle control and energy management strategies for the series/parallel hybrid system,and completed the sample vehicle carrying and verification of the system.The main research contents are as follows:1.According to the energy saving mechanism and component characteristics of the system analysis the configuration of the hybrid system with series/parallel.Through theoretical analysis and testing of the motor,engine and battery systems,key performance indicators and state parameters related to the energy consumption and control of the system were obtained.According to the system configuration,its working mode and corresponding operating mode were analyzed,and the energy flow of each working mode was emphatically studied,and then the energy-saving mechanism and working condition adaptability of the working mode were clarified.All in all,it provides basic characteristics and theoretical basis for in-depth research on vehicle control and energy management strategy,vehicle and control strategy modeling.2.Research on vehicle control strategy of series/parallel hybrid system focused on the realization of control strategy and optimization of system energy management.In the vehicle control strategy engineering application,designed the vehicle control strategy architecture,including upper and lower power control,energy management optimization control strategy,control command output,to achieve the vehicle driving function;In energy management system optimization,mainly started from the driving intention parsing,the working mode of power allocation strategy and mode of entry/exit mechanism of energy management strategy to optimize several aspects: first,setting accelerator pedal accelerator pedal control characteristics of the torque compensation MAP overlay,considering the special working conditions,such as idle crawl and urgent acceleration,in order to react driving intention;Secondly,according to the component characteristics,the centralized distribution of engine working points along the BSFC line was taken as the goal,and the control method based on logical threshold was adopted to optimize the power distribution under each operating mode.Finally,considering the dynamic and economic constraints in the process of mode selection,a mode optimization strategy based on efficiency optimization was proposed,and an entry/exit mechanism between modes for economic optimization was established.Through the above content,completed the vehicle control and energy management core strategy research and development.3.Control strategy model was established and the simulation platform,setting up in MATLAB/Simulink environment simulation platform,including the drivers to follow the model,power system and parts of the vehicle model,vehicle control system model,to verify the vehicle control and energy management strategy on the accelerator pedal control characteristic,working condition of driver intention recognition and circulation economy in terms of control effect.4.Real vehicle testing and analysis: Completed series/parallel hybrid system and the corresponding control strategies of real vehicle carrying,designed under the environment of real vehicle test scheme,tested the control effect for idle crawling,throttle,reverse driving conditions,and verified of vehicle driving cycles through the distribution of the engine working point,verified the validity of the control effect. |
