Study On The Development Of Simulation Platform For Wheel Loader Power Performance And Fuel Economy

Study on the Development of Simulation Platform for Wheel Loader PowerPerformance and Fuel economyPowertrain, which transfers power for the movement of vehicle and the motion of implement, is a significant component of wheel loader. The performance of powertrain directly affects the operating efficiency, fuel economy, and environmental impact. As wheel loader has the features of low-speed, heavy load,and load fluctuation while working, the carrying capacity of component and product performance need to be considered. Using computer to simulate the performance and load fluctuation of powertrain in the early period of new product design could shorten design cycles and reduce the development costs.Based on the background above, this paper researched the powertrain of wheel loader. The project was subsidized by the national natural science foundation "Study on the Key Technologies of Powertrain Load Spectrum of Wheeled Vehicle"(No.50805065)and enterprise cooperation projects "Development of LW1200K Wheel Loader". The author modeled the powertrain of loader, researched the shift strategy that adapt for wheel loader, then predicted the dynamic performance, fuel economy and emission performance, then simulated the dynamic parameters of each component.The load curve of loader while shoveling was compiled, and a optimization theory for the whole system based on the typical load was developed.In order to achieve the object above, detailed works have been done below.1.Mathematical modeling. Mathematical model of each main component was established based on the study of their mechanism.2.Determine the technical route of simulation program. A method integrates forward-facing and backward-facing was proposed. The model uses external load and parameters of loader as input, simulates the performance iteratively using Euler method. Study the proper shift strategy. A three parameters shift strategy which control the loader working in well dynamic performance during shifting, was developed, the control parameters are throttle opening, vehicle speed, and load coefficient respectively3.Developed simulate platform for dynamic performance and fuel economy of wheel loader in Matlab/Simulink. Each component consists of forward-facing path and backward-facing path, in which data was constrains if necessary. The model also contains error checking modules that control the simulation automatically.A GUI interface is exploited. GUI interface guides the user to set the parameters, control the running process, and do some calculation use Simulink model. The platform could simulate the power performance,fuel economy and emissions,and conduct virtual testing for specific configuration vehicle, Comparative analysis of multi-program6.Compile the drive cycle. Based on the data tested with cooperative enterprise compile the typical shovel load cycle for ZL 50 loader after dispose. Detailed method includes filter and remove noise, get rid of singular value, select typical point, curve fitting, and compile drive cycle. The simulation results were verified by compared with the data provided by the manufacturer.4. A optimum method using GA and tested drive cycle was proposed. The method uses the dynamic performance as constrains, the fuel economy and the efficiency of torque converter as object respectively.The works in this paper are utility and worth to be extended. The program developed in this article obtains the dynamic performance, fuel economy, and emissions which are important indexes during product design, analysis and verification. The accurate simulation results may provide fundamental basis and reference for wheel loader design. Three parameters shift strategy also contributes to the automatic control of loader; the load of component simulated could be used to guide the design of key component.