Research On Vehical Economical Of A Certain Type Of Semi-truck Based On The Matching Optimization In The Intake And Exhaust System Of The Engine

The fuel consumption of the automotive has been increasing constantly with the quantity of the automotive rising quickly in china,which increase the dependence on the import for the energy supplying and induce the huge pressure for the development of the national economic and protection of the environment.Because of the heavier payload and larger fuel consumption,the heavy commercial vehicle occupies over 60%fuel consumption among the all vehicle type.So,it’s most important to reduce the fuel consumption and emission for the heavy commercial vehicle.It’s an efficiency method to improve the competition for the vehicle by researching the law of the fuel consumption in the reality running cycle and popularizing the different methods of reducing fuel consumption.In this way,the industries that produce the heavy commercial vehicle can gain the advantageous competition in the market,and ensure the surviving and developing itself.This paper summarizes the researching conditions and achievements about the reducing fuel consumption for the heavy commercial vehicle in the domestic and foreign countries,values that how the intake resistance,intercooler pressure difference and exhaust back pressure impact on the output torque,specific fuel consumption,full load characteristic and fuel map characteristic using the GT-Power,and which take the heavy tractor tuck as researching subject and set the matching of intake and exhaust system as optimization goal based on the theory of the aero flowing simulation in the engine.And then,it proves and values the simulation results using the road and bench testing.By the theory analysis and reality testing,it values the contribution ratio that optimization of the intake and exhaust system impact on reducing the fuel consumption,which provides the important reference evidence for improving the fuel economy of the heavy commercial vehicleThere are several steps to achieve the researching.First,be familiar with the basic function and introduction of the GT-Power,and to master the analysis theory.Second,this paper establish the simulation and analysis model for the research subject ISL9.5,and then calibrate the model by testing to ensure the effectiveness of the simulation model after the parameters setting.Third,based on the analysis model,it studies how the intake resistance,intercooler pressure difference,and exhaust back pressure impact on the fuel consumption of the vehicle,compares the difference of the output parameters that caused by the intake resistance,intercooler pressure difference,and exhaust back pressure to value the impacts for the full load and fuel map characters.Lastly,it proves result of the simulation analysis by the engine bench test and the vehicle real road test.Also,it introduces and analyzes the difference and weakness between the several fuel consumption methods that used currently.In order to achieve more reality fuel consumption testing,it addresses to apply the customer analogy fuel consumption testing method to do the test.It proves the contribution for reducing the fuel consumption caused by the matching optimization of the intake and exhausts system according to the theory analysis and reality testing,and then it addresses the method to improve the fuel economy with optimizing the matching of the intake and exhaust system.It presents notable effectiveness for reducing the fuel consumption by lowering the intake resistance and exhaust back pressure,which has the same changing trend as well as the result of the CFD simulation.It demonstrates that it can work to improve the fuel economy by using the matching optimization for the intake and exhaust system.It is useful and meaningful to guide the matching design for the intake and exhaust system.