工程车辆液力机械传动效率控制

Efficiency control of hydrodynamic-mechanical transmission of engineering machinery

为了解决大功率推土机在液力工况下持续作业时油温过高导致作业效率下降的问题,在对液力机械传动系统动力学模型研究的基础上,构建了系统动力学仿真模型及其效率控制系统模型。通过构建Isight与Simulink的联合仿真平台,采用拉丁方试验设计方法,对效率控制系统PID参数进行优化。仿真及试验结果表明:采取作业延迟作用及重载预判等技术手段对液力传动系统效率进行控制,可使液力变矩器在高效区域内工作,有效地抑制推土机液力传动的高温过热问题,提高了推土作业效率。

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.