Research On Control Strategy Of Single Axle Parallel Hybrid Suburban Logistics Vehicle

Since the birth of the automobile at the end of the 19 th century to today in the 21 st century,with the industrial revolution,it has completed a rapid evolution.While the automobile brings great convenience to mankind,it also brings many problems: for example,the contradiction between the need to use a lot of energy for development and the increase of harmful emissions caused by the use of energy.The proportion of my country’s imported oil has been increasing year by year,with the import volume exceeding 70%,far exceeding the international level,energy conservation is becoming more and more important;with the increase in private cars and the increase in haze,people should realize that dealing with environmental problems is a question of how humans can save themselves.In response to the issue of greenhouse gases,my country has put forward goals such as carbon neutrality and carbon peaking,and the automobile industry has a heavy responsibility.Against the background of energy conservation and emission reduction advocated by the world,there are more and more researches on hybrid vehicles in various countries.Hybrid vehicles can not only maintain a long driving range,but also reduce emissions and save fuel.Therefore,the automobile industry’s use of hybrid electric vehicles as part of its research has a significant effect and significance on energy and environmental protection.In the design process of hybrid electric vehicles,the selection of internal combustion engine,motor and other components and the control of the output of both have always been important links.In addition,with the rapid development of the logistics industry,the market share of suburban logistics vehicles is increasing.The impact of frequent start and stop of such vehicles in cities on emissions cannot be ignored,and it will also bring a certain degree to the solution of energy and environmental problems.pressure.Different driving conditions used in vehicle development have different impacts on economy and emissions.For a long time,Chinese car companies have used foreign driving conditions for development,and there is still room for improvement in economy and emissions.In 2020,my country will release the driving conditions of Chinese cars,and it is of practical significance to carry out relevant research on suburban logistics vehicles under these conditions.The research content in this paper is as follows:First of all,a brief introduction to the common structure of hybrid electric vehicles,the single-axle parallel type is selected as the structure of the layout of the power components of the suburban logistics vehicle;the relevant parameters are calculated and selected according to the vehicle design requirements,and the parameter matching of the internal combustion engine,the motor and other components is completed.Secondly,in accordance with the forward simulation process,the suburban logistics vehicle model was built in the Simulink environment.According to the selection and matching of power components and hybrid types,based on the Simulink/Stateflow toolbox,a rule-based logic gate control strategy and a fuzzy logic control strategy are designed.The simulation analysis was carried out under a part of New European Driving Cycle(NEDC)and China Heavy-duty commercial vehicle Test Cycle-Light Truck(CHTC-LT).The results show that the two control strategies can complete the torque distribution of the internal combustion engine and the motor under the two operating conditions,and the developed fuzzy logic control strategy has more State Of Charge(SOC)changes under the CHTC-LT.Stable,economic performance and emission performance have been improved.Finally,a single-shaft parallel hybrid experimental bench with the same configuration as the research object of this paper was built,and some NEDC hybrid operating conditions were selected for experimental research.The research shows that under two control strategies: the fuel consumption obtained by the simulation is consistent with the change and trend of the fuel consumption obtained from the bench test,which can prove the credibility of the simulation model and control strategy built in this paper;in the hybrid power mode,fuzzy logic control The strategy has lower fuel consumption and lower emission concentration.Compared with the logic gate control strategy,the fuel consumption is reduced by 9.41% when the fuzzy logic control strategy is adopted,the SOOT emission is reduced by 7.55%,the CO is increased by9.17%,the NO is reduced by 10.33%,and the NOx is reduced by 7.95%.The test results show that the use of fuzzy control strategy can effectively improve the economy and improve the vehicle emission effect in hybrid operating conditions,and achieve the goal of optimization.