Research On Torque Distribution Strategy Of Plug-in Hybrid Electric Bus Based On Game Theory

The development of new energy vehicles is an important strategy for the transformation and upgrading of China's automobile industry.It is also an important way to achieve energy saving and emission reduction in the whole society.Hybrid electric vehicle is an important part of new energy vehicle.Because of its low fuel consumption and long driving mileage,hybrid electric vehicle has become the focus of industry development.The improvement of energy utilization of hybrid electric vehicles can not be separated from the efficient coupling of electromechanical systems.This paper studies the optimization of fuel economy for plug-in hybrid buses(PHEB).The research focuses on the energy distribution of different power sources in electromechanical coupling systems.Based on the traditional rule-based energy management strategy,the mathematical method of game theory is introduced to optimize the distribution of driving torque and braking torque.The specific research contents and results are as follows:Firstly,according to the system characteristics of a plug-in hybrid bus,the electromechanical coupling system model is built through combining reverse simulation and forward simulation by Matlab/Simulink.Models include powertrain components such as engines,motors,clutches,gearboxes,and more.Design the appropriate controller execution logic.Establish a closed-loop control environment to facilitate simulation analysis of vehicle performance.Secondly,according to the vehicle structure and working mode of PHEB,this paper selects the SOC and driving power as the main reference variables to establish a rule-based energy management control strategy.Design an economical shift strategy for different drive modes.In order to further improve the fuel economy of the whole vehicle,the problem of real-time distribution of the output torque of the engine and the motor is converted into an optimization problem based on differential game.By comparing and analyzing the equilibrium solution under the competition and cooperation situation,the optimal control of engine and motor torque distribution is obtained.The weighted coefficient method is used to solve the zero-sum game problem of energy recovery and battery life loss during regenerative braking.Finally,the rapid control prototype test of the vehicle energy management strategy is carried out by using the hybrid locomotive electromechanical coupling system testbed.The experiment verifies the practicability of the torque distribution strategy based on game theory,and the fuel economy of the whole vehicle has been effectively improved.