The Simulation Perfermence And Analysis For Election Control Hydraulic Litmitedslip Differential Of Loader Based On Fuzzy Control

As the poor and complex working conditions of wheel loader, the traction often declines sharply by high-speed spinning of the wheels so that the loader does not work, seriously affecting the work efficiency. In our country, the Loaders generally use the common open and self-locking limited slip differential to decrease the shovel capacity reducing caused by the wheels skid. With the advanced control technology, electronically controlled limited slip differential can adjust the output torque based on real-time road conditions, and reasonably distribute the drive torque, then inhibit the wheels slip. As if its application in the wheel loader, the traction and the passing ability when the loader operating will be greatly improved.This paper analyzed the disadvantages of the traditional mechanical limited slip differential, according to the forms of loader drive axle, and improved the friction plate limited slip differential, then obtained the electro-hydraulic limited slip differential using for loader. For the ZL50 loader, the paper completed the dynamics analysis of the loader transmission and the building of a vehicle simulation system, and designed the fuzzy controller of with parameter self-tuning of the electro-hydraulic limited slip differential, moreover verified its rationality and applicability by the simulation analysis.For the driving transmission system of the ZL50 loader, the paper analyzed the transmission characteristics of the relevant parts, according to the experiment data, and in turn established mathematical model for the loader engine, the torque converter, the transmission, the drive axle and the wheel. Then combining the relevant parameters of the loader, the paper built and debugged a straight line driving simulation system by these mathematical models in MATLAB / SIMULINK.The electro-hydraulic differential system as a control model, this paper used this fuzzy control algorithm to design membership functions of the controller -Control Rules. With the vehicle simulation system, the capability of the electro-hydraulic limited-slip differential system in the butt on the road, separating the road and the chessboard road straight driving had been simulation analyzed. This paper compared the common open differential with the electro-hydraulic limited slip.The results showed that the electro-hydraulic limited slip differential with the fuzzy control conquers the disadvantages of the open, and has good adaptability to the road conditions with adhesion coefficient changing, and adaptively adjusts the limited slip torque output by the road conditions, so that the drive torque of the two sides wheel can be distributed in reason. These can suppress the wheel slip and improve traction performance. The designed controller can quickly control the slip rate in the vicinity of target; its response time was significantly less than the ordinary open differential; the control of high precision. The paper proved that the matching between the control system and the electro-hydraulic system, the rationality of the control method.