基于AMESim的ECAS车高调节模糊自适应控制研究

Research on Fuzzy Self Adaptive Control of ECAS Vehicle Height Adjustment System Based on AMESim

针对电控空气悬架在车身高度调节过程中存在的过充、过放以及目标值附近的震荡等不良现象,基于AMESim建模与仿真平台建立了单轮ECAS车高调节系统物理模型,准确获取了ECAS在车高调节过程中存在的复杂动态特征,利用Matlab设计了ECAS车高调节模糊自适应控制器,对车高调节过程中进入或流出空气弹簧内的气体质量流量进行准确控制,并进一步采用PWM技术将连续的气体质量流量控制信号转化为离散的高速开关电磁阀直接控制信号,从而实现对ECAS车高调节系统的实时控制。基于AMESim和Matlab进行ECAS车高调节模糊自适应控制器实际控制性能的联合仿真研究,仿真结果表明,所设计的控制器能够实现车身高度的有效调节。

Aiming at the undesirable phenomenon of over-charge,over-discharge and oscillation during vehicle height adjustment process of electronically controlled air suspension,a single wheel physical model of ECAS was built in AMESim and got the dynamic characteristics of air suspension during the height adjustment process of air spring. The fuzzy self adaptive controller was designed based on Matlab to control the gas mass flow into or out of the air spring during the adjustment accurately. And using PWM technology to transform the continuous gas mass flow control signal into discrete highspeed switch electromagnetic valve direct control signal,it realized the real-time control of vehicle height adjustment for ECAS. Its actual control performance was verified by union simulation based on AMESim and Matlab. The results of the simulation show that the controller can regulate the vehicle height effectively.