The Performance Simulation And Analysis On The Powertrain Of 80 Wheel Loader

The powertrain which has functions as transfering of power, transmission, steering,braking and so on is an important component of the loader. The traditional methods both waste money and waste time but also have some limitations on wheel loader research and development process. Recently with the quickly development and extensive useing of the computer, this provide the power tools and instruments for the technique of simulation. In this paper, by analyze the powertrain of the engineering vehicles, combination of the structure function requirement , developed the model of powertrain of 80 wheel loader, using SIMULINK toolbox which is provided by MATLAB. Simulate the powertrain of the wheel loader in each working condition, using the Simulink model. Optimize the performance-matching of the powertrain of 80 wheel loader, this also lay the groundwork for the powertrain design.The full dissertation was divided into eight chapters, mainly as follows:1. PrefaceThis part simply described the development and prospects of Chinese loader industry; the direction of Chinese development of wheel loader; the current research situation of working device and the frame of loader and the method ,content and significance of this research.2 . Introduction and application to MATLAB/Simulink softwareRecently, powertrain simulation mostly use general simulation tool, for example, MATLAB/Simulink. MATLAB is a highly integrated system, it provide Simulink which is used for modeling, simulation and analysis on the dynamic system. Simulink is commonly used in modeling and simulation of the powertrain system.. It is universally have a Algebraic loop problem, when you use Simulink. This chapter emphasized the reasons for Algebraic loop in the process of using the Simulink software and how to deal with this problem.3. Powertrain modelFirst, introduce the component of the powertrain of wheel loader. Base on the establishing of the main part's mathematic model, establish the engine module, torque converter module, transmission module, entire car module and external environment module. It emphasizes on the modeling process of multi-plate wet clutch. It also emphasizes on transmission relations of gears and how to control shifting. A simplified treatment for the model of the driving bridge including final driver. Modeling correctly ,it lay a good foundation for the correct simulation result.4. Simulation and analysis of performance characteristic of wheel loaderThis chapter presents a simulation to the wheel loader, using the Simulink model which is build in the past chapters. This paper introduced a variety of vehicles shift rules.The emphasis was put on the shifting of vehicle efficiency and dynamic,and the best dynamic shift were determined. On the condition of starting to accelerate of 80 wheel loader , research the starting acceleration performance of first gear, second gear on the same road, and reseach the starting acceleration performance of first gear on the different road. Contrastive analysis on the optimize shift mode and manual shift ode of first gear to second gear. To high-speed running of wheel loader, contrastive analysis on acceleration of second gear and acceleration of first gear. Introduce several operation methods of wheel loader. Finally,According to the principle of proper matching between engine and torque converter, the characteristica of concerted work was determined. By using the MATLAB software, input/output characteristic was obtained for engine and torque converter working together. Moreover,with the study of V-operation in Shoveling condition,deducting the hydraulic system shunt,obtain the coordinate work input characteristic curve of engine part power and torque converter.Study the matching of the two parts in several working condition.5. Actual Working Conditions of the wheel loaderA scooping cycle of wheel loader based on three different methods was also studied,which was divided into four phases.By the comparative analysis,we got both of the advantages and disadvantages of different ways. The results showed that the second approach (the function of KD shifting ) could reduce the labor intensity of the operator and improve the efficiency of loader by saving work time around 30 percent . Finally, we can arrive at the advantage and disadvantages of the three different methods.6. ConclusionIn this part,the main conclusions of the paper were given,the prospects of the research for the powertrain of wheel loader were discussed and the future directions of the research were given.