Research On Power System Matching Design And Energy Management Strategy Of High Power Fuel Cell Heavy Truck

In the context of the global energy crisis and environmental pollution challenges,it is imperative to popularize new energy vehicles.Due to characteristics of fast fuel filling,high efficiency,no pollution and long range,fuel cell vehicles have become a research hotspot in the field of new energy vehicles.As a major oil consumer in China,heavy truck is the most polluted vehicle among all types of vehicles.It is of great significance to accelerate the development of fuel cell heavy truck.Fuel cell has some disadvantages in starting time,output characteristics and cost control.Therefore,fuel cell heavy truck generally uses hybrid power system of fuel cell and auxiliary power source.Its energy management strategy determines how to allocate reasonable energy between the two power sources,and it has also become the key to giving full play to the advantages of the hybrid power system,improving the vehicle’s dynamic and economic performance,and fuel cell durability.At present,due to the limitation of factors such as the key technology of the stack,reliability and durability,the domestic research on fuel cell vehicles is mostly focused on small and medium-sized vehicles that match small power fuel cells,and there is little research on heavy trucks equipped with high-power fuel cells.Therefore,the research of power system matching design and energy management strategy for fuel cell heavy trucks is of great significance.This subject is a major special project of shanxi provincial science and technology department: Heavy fuel cell power system and the vehicle integration technology project(20181102009)as the backing,taking high-power fuel cell heavy trucks as the research object,aiming at the problem that there is no mature energy management strategy for high-power fuel cell heavy trucks,this paper studies the power system matching design and energy management strategies of fuel cell heavy trucks.Mainly completed the following work:(1)Matching design of fuel cell heavy truck power system.On the basis of analyzing the characteristics of common powertrain configuration schemes of fuel cell vehicles,combined with the characteristics of heavy truck working conditions,the parallel hybrid configuration of fuel cell and power cell(FC + B)is determined.Then according to the vehicle parameters and performance goals of the fuel cell heavy truck in this subject,the selection and parameter matching of the key components of the power system are completed.(2)Vehicle modeling and dynamic performance verification.The whole vehicle simulation model of the fuel cell heavy truck was built by using Cruise,and then the power performance of the heavy truck was simulated and analyzed.According to the results of the matching design of the power system,the project cooperation unit completed the construction of the fuel cell heavy truck experimental platform,which verified the rationality of the matching design of the power system of the heavy truck and the accuracy of the vehicle simulation model.(3)Research on the energy management strategy of fuel cell heavy trucks.In order to solve the problem that there is no mature energy management strategy for the high-power fuel cell heavy truck hybrid power system,the control strategy of high power fuel cell protection priority in energy management strategy is proposed.According to the strategy,considering the dynamic working condition characteristics of the heavy truck and the working characteristics of the power system,on the premise of achieving the optimal working state of fuel cell and with the goal of improving the economy of the heavy truck and the durability of the fuel cell,to establish a hybrid fuzzy energy management strategy.And then,on this basis,the weighted average filtering algorithm and variable load rate limiting method for fuel cells were used to propose WAFA composite fuzzy control energy management strategy in order to reduce the frequency of fuel cell degradation working conditions.(4)Analysis of control effect of energy management strategy.Based on Cruise and Simulink,a joint simulation model of the fuel cell heavy truck vehicle and control strategy is built.The heavy-duty hybrid commercial vehicle test condition(C-WTVC)is used as the cycle condition,and the power follow strategy is fuzzy with the WAFA designed in this paper.The control effect of the control strategy is compared and analyzed.The results show that,under the complex working conditions of heavy trucks,the WAFA hybrid fuzzy control energy management strategy is superior to the power-following strategy in terms of vehicle economy and fuel cell durability.The average working efficiency of fuel cell increase by 6.46%,the equivalent hydrogen consumption per 100 km reduce by 4.64%,and the working conditions that cause the life decay of fuel cell are significantly reduced.