基于余压控制的液压制动系统性能研究

为了提高液压制动系统的性能,分析了制动效能的影响因素和矿用自卸车液压制动系统的原理。建立了液压制动系统简化模型,并对其关键元件制动踏板阀进行了特性分析。应用AMESim建立了液压制动系统的仿真模型,研究了参数变化对系统性能的影响,提出了余压控制减小制动器作用时间的方法,试验结果验证了仿真分析的正确性和余压控制的可行性,减小了制动器作用时间,缩短了制动距离,使制动性能大大提高。

Performance Study and Test of Hydraulic Braking System Based on Remaining Pressure Control

In order to improve the performance of hydraulic braking system, the influencing factors of vehicle braking performance and system principle of mine dump truck were analyzed. Results indicated that the shorter the action time, the smaller the braking distance under certain conditions of maximum braking deceleration and initial braking speed. The simplified model of hydraulic brake system was established, and characteristic analysis was made toward its key component brake pedal valve. The simulation model was built by AMESim to study the influence of brake performance with parameter variation. Conclusion showed that braking system response speed and pressure building time were impacted by several parameters such as accumulator volume, charging pressure and brake pipe length. The methods of decreasing brake action time by residual pressure control were proposed. Correctness of the simulation analysis was verified by experiment results which showed that the action time of brake was reduced and braking distance was shortened with this method. Braking performance was improved greatly, which provided theoretical basis for the design and optimization of similar products.