Research On Power Matching Of Urban Road Multi-functional Vehicles Based On Variable Working Conditions

In recent years,with the increase of urban road area in China,the number of road cleaning and maintenance operations has become increasingly heavy.The existing sweeper in the market has been unable to fulfill the diversity and efficiency of road operations.In order to enhance the operation efficiency and the utilization rate of equipment,the research on urban road multifunction vehicle has gradually attracted more and more attention from scientific research institutions.This model can replace a variety of machines and tools to fulfill different operation requirements.However,the variable load of urban road multi-functional vehicles under different operating conditions,the engine output cannot well accommodate to the change of power demand of the load,leading to the phenomenon of power mismatch and energy dissipation.Therefore,in response to the development trend of national energy conservation and emission reduction,and enhance the economy and efficiency of equipment,it is of great significance to design of power and transmission system and research the modular design and power matching control of urban road multi-functional vehicles.This thesis takes urban road multi-function vehicle as the research object.Firstly,the thesis expounds the development status of urban road multi-function vehicle,the power matching control of construction machinery and the research of energy-saving technology.Based on the working principle of urban road multi-function vehicle,the hydraulic system scheme is determined,and the power system is analyzed and selected.Secondly,the power demand of urban road multi-functional vehicles under typical working conditions of different operating modes is analyzed and calculated,and the principle of power matching between engine and hydraulic system is researched.The power matching problem of urban road multi-functional vehicles is divided into static matching and dynamic matching.According to the principle of static power matching control,the optimal working speed of the engine corresponding to the power required under typical working conditions of each operation mode is determined.Then,the power demand changes of working system and driving system under different working conditions of each operation mode are analyzed in detail and the power dynamic matching scheme of each operation mode is proposed.Due to the dynamic power matching control needs to adjust the ratio of driving system power in the total power,the response characteristics of the driving system to the power matching regulation signal is the basis for realizing the power matching of urban road multi-functional vehicles under variable conditions.In this thesis,the classical PID,fuzzy PID and genetic algorithm PID are used to optimize the dynamic response of the driving system under the regulation signal,and their working principles and the design of the driving system controller are analyzed and the control block diagram is set up.Using AMESim software,the physical modeling of the driving control system of urban road multifunctional vehicles is built,and the controller module of intelligent algorithm is built in Simulink software.Through the communication module,AMESim and Simulink software are combined to build a co-simulation model to analyze the influence of different algorithms on the dynamic response of the driving control system.The simulation results show that different control algorithms should be used to achieve better dynamic response of the driving system and realize dynamic power matching under different operating conditions.This thesis provides a theoretical basis for the scheme of power dynamic matching of urban road multifunctional vehicles with different working conditions.