Design And Analysis Of Power System Parameters Of Hybrid Bus

Hybrid vehicles use engines and electric motors as power sources and are the most industrialized vehicles in new energy vehicles.Urban public transport buses,as the most common urban public transport vehicles in the city,have a large number.Therefore,it is of great significance to carry out mixed transformation of urban public transport buses to increase the economic efficiency of urban public transport buses and improve the efficiency of energy use.Because of the regularity of the driving route of the hybrid city bus,it is possible to carry out the debugging of the control parameters through the simulation of the cycle conditions through experiments and to design the control strategy reasonably to achieve the purpose of optimizing the economy.The thesis firstly introduces and analyzes the advantages and disadvantages of three hybrid powertrains(tandem type,dual-axis parallel type,and single-axis parallel type)of a hybrid vehicle,and determines that the structure of a single-axis parallel hybrid system should be mixed in this thesis.Power city buses are more suitable.According to the prototype vehicle's dynamic requirements of the hybrid city formula,to meet the dynamic requirements as the basic requirements,the key components of the power system are selected and the parameters are matched,and then the economic design goal is optimized by the control strategy.The analysis of the control strategy of the powered city bus has pointed out the key factors influencing the economy in the control strategy,and the switching basis of the hybrid work mode is analyzed.Then use the software to model according to the mathematical model and theoretical basis of each component of the hybrid power system to complete the vehicle model.The input and output signal tables used in the control strategy were prepared,control parameters were extracted,and the hybrid control strategy driving mode determination and output data signal modeling were performed using these signals and control parameters to complete the research and analysis of this paper.Modeling of Control Parameters for Power Bus.Then,using the simulation model established in the previous section,based on the most typical CBCC(China's typical urban public transportation cycle conditions)in which Chinese urban buses operate,the research on the start-up speed and engine torque range of the pure electric mode is performed for the hybrid bus passenger battery.The effect of SOC and equivalent 100 km fuel consumption,automatic optimization program to obtain the best control parameters and its corresponding battery SOC consumption and equivalent 100 km fuel consumption.Using the same method to obtain the control parameters of the other two typical cycle conditions and their corresponding battery SOC consumption and equivalent 100 km fuel consumption,the results obtained are different,indicating that the best economic efficiency in the hybrid control strategy The control parameters obtained are all different.However,for a city bus,the driving route is fixed.As long as suitable control parameters are set for the same route of the same car,it can be guaranteed that it will be obtained on this route.The best economy.Finally,using the existing test equipment resources to build the required test bench and design the test program,use the speed and torque data obtained from the test bench running simulation to obtain the voltage,current and energy consumption of the permanent magnet synchronous motor on the bench test.Comparing the energy consumption of the permanent magnet synchronous motor obtained by the bench test with the energy consumption of the simulated motor,it is found that the permanent magnet synchronous motor can accurately execute the rotational speed torque command assigned to it by the control strategy.The purpose of this test is to use the bench test.It shows that the battery SOC consumption is consistent with the simulation result,which further proves that the battery SOC consumption and equivalent 100 km fuel consumption obtained in the previous simulation are of practical significance.