附加气室容积可调式空气悬架分层控制研究

Study on the hierarchical control for air suspension with volume adjustable auxiliary chamber

针对车辆因所处工况发生改变导致其综合性能差的问题,以附加气室容积可调式空气悬架为研究对象,基于热力学及车辆动力学理论,建立其数学模型及仿真模型,提出一种附加气室容积可调式空气悬架系统分层控制策略;设计基于区间—免疫算法的上层附加气室容积控制器和以主、附加气室内气体总质量为控制目标的下层气体质量流量模糊控制器,并进行仿真试验。结果表明:所设计的附加气室容积可调式空气悬架分层控制器显著改善车辆的综合性能:车身垂向加速度均方根降低10.0%,轮胎动载荷均方根增加2.5%,悬架动挠度均方根增加2.0%。

Aiming at the problem that the comprehensive performance of the vehicle is bad due to the change of its working condition,taking the air suspension system with volume adjustable auxiliary chamber as the research object,based on the theories of thermodynamics and vehicle dynamics,the mathematical model and simulation model are established,and a hierarchical control strategy of the air suspension system with volume adjustable auxiliary chamber is proposed.The auxiliary chamber volume controller based on Interval-Immune Algorithm in upper layer and the mass air flow fuzzy controller in bottom layer taking the air quality in the main and auxiliary chambers as the control objective are designed and a simulation are conducted.The results show that the hierarchical controller of the air suspension system with volume adjustable auxiliary chamber can significantly improve the comprehensive performance of the vehicle.The mean square value of vertical acceleration is reduced by 10%.The mean square value of tire dynamic load is increased by 2.5%,and the mean square value of suspension dynamic deflection is increased by 2%.