电控空气悬架充放气的动态建模及特性仿真

Dynamic Modeling and Characteristic Simulation of Charging-discharging System for Electronically Controlled Air Suspension

为了获得电控空气悬架充放气过程的动态特性,结合变质量系统的热力学过程和车辆动力学方程,建立了电控空气悬架充放气的动态模型,考虑到充放气过程的非线性,采用Matlab/Simulink搭建模型并对进行特性仿真。研究表明充放气过程可细分为变质量开口系统和电磁阀关闭后的闭口系统平衡过程,后者也是造成空气悬架客车高度切换时"过充"和"过放"现象的原因。通过仿真分析获得不同充放气时间和不同悬架参数(载荷、减振器阻尼)对充放气过程的影响规律,尤其减振器阻尼对系统稳定性影响较大,这为空气悬架高度控制策略的制定提供了依据。

In order to obtain the dynamic characteristic of charging-discharging process for Electronically Controlled Air Suspension（ECAS）,the charging-discharging dynamic model of ECAS was created by combining the thermodynamics process of variable mass system and vehicle kinetic equation.Considering the nonlinearity of charging-discharging process,the characteristic simulation was carried on by building the Matlab/Simulink model.It has been shown that the charging-discharging process must subdivide two parts of the variable mass opening system and the closed balancing system after closing the electromagnetic valve,and that the latter makes ＂over-charging＂ or ＂over-discharging＂ when the ride height switching.The effecting rules of the charging-discharging process are achieved by simulating analysis under the different charging-discharging time and suspension parameters（e.g.mass,damping） changing,and the simulating results provide a foundation for the height control strategy of air suspension.