电子控制空气悬架高度调节过程非线性模型

Nonlinear Model on Leveling Procedure of Electronically Controlled Air Suspension

电子控制空气悬架的高度调节过程是一个复杂的非线性过程,为研究高度调节过程中对空气弹簧充气或者排气时悬架的动力学特性以及作为后续悬架高度控制策略的研究基础,对电子控制空气悬架高度调节中的弹簧内气体热力学过程、簧载质量动力学过程进行分析,推导出高度调节过程中电磁阀开启期间和关闭后的空气弹簧内压力梯度方程、气体回路的流量方程、以及簧载质量动力学方程,建立带电磁阀功能的高度调节过程非线性模型,并通过电磁阀在不同脉冲时间下空气弹簧充气和排气的整车试验对所建立的高度调节过程模型进行验证,试验结果与仿真结果吻合较好。研究结果表明所建立的模型能正确描述电磁阀关闭前后空气弹簧内的气体状态以及电磁阀关闭以后的悬架在阻尼力作用下运动的迟滞特性。

Suspension leveling of electronically controlled air suspension is a complicated nonlinear procedure. To research the dgnamic of suspension in leveling procedure with air spring inflated or deflated, and to serve as a basis for the follow-up research on suspension height control strategies, analyses are performed on the gas thermodynamic process in air spring and spring loaded mass dynamic process in leveling procedure of electronically controlled air suspension, from which the equations of air spring pressure gradient, gas loop flow rate, and spring loaded mass dynamics in the open period of and after closing of magnetic valve in leveling procedure are derived. A series of suspension leveling experiments in full scale vehicle with different single pulse exerted magnetic valve to inflate or deflate air spring are conducted to verify the proposed nonlinear model, the results of experiments and simulations show good consistency. The proposed model can correctly depict the gas state in air spring before and after loaded magnetic valve, and the lag characteristic of suspension motion under the action of damping force after the closing of magnetic valve.