Efficiency control of hydrodynamic-mechanical transmission of engineering machinery

When a high-powered bulldozer works under hydrodynamic conditions for a long time, the temperature of the transmission oil will excessively raise and the transmission efficiency will decrease. To solve such problem, the dynamics simulation model and efficiency control model of the hydrodynamic mechanical transmission system were proposed based on the research of it dynamics model. Then the Isight and SimuLink integrated simulation platform was built up to obtain the optimized parameters of PID controller using the design of experiment with Latin Hypercube method. Simulation and experiment results show that with the efficiency control of the transmission system using working delay action and heavy load prejudging techniques, the torque converter can work in its high efficiency region, and the overheating of the transmission oil can be effectively eased, therefore, the working efficiency of the bulldozer is obviously improved.