气路闭环横向互联空气悬架车身高度调节

为进一步改善空气悬架动力性与能耗经济性,结合互联空气悬架系统与高低压罐气路闭环车身高度调节系统的优点,提出气路闭环横向互联空气悬架系统.针对传统空气悬架车身高度控制策略应用于互联悬架存在的移植性缺陷,构建专门适用于横向互联空气悬架的车身高度比例积分微分-脉冲宽度调制(PID-PWM)控制策略,基于MATLAB/Simulink建立整车数学模型并进行仿真分析.仿真结果表明该控制策略响应迅速,且避免了超调现象,解决了传统空气悬架车身高度控制策略应用于横向互联悬架的移植性缺陷等问题.搭建试验台架,进行车身高度调节试验并对储气罐不同初始气压下充放气时间及控制误差进行研究.试验结果表明,提出的控制策略能准确地实现气路闭环横向互联空气悬架系统车身高度的切换,验证了所建模型的正确性以及控制策略的有效性,储气罐不同初始气压对车身高度调节性能的影响研究为车身高度调节的参数选择提供了依据. 

Vehicle height adjustment of closed-loop air circuit laterally interconnected air suspension system

In order to further improve the dynamic and energy-economic performance of air suspension, a closed-loop air circuit laterally interconnected air suspension structure which combines the advantages of both interconnected air suspension system and closed-loop air circuit air suspension height control system with high and low pressure chambers was proposed. In order to deal with the portability defects caused by traditional air suspension height control strategy when it's applied to the interconnected suspension system, a special proportion integration differentiation-pulse-width modulation (PID-PWM) height control strategy designed for laterally interconnected air suspension was proposed and a corresponding mathematical model was established for simulation study via MATLAB/Simulink. The simulation results show that the control strategy works effectively, the overshoot phenomenon is avoided and the portability defects have been solved. A height adjustment experiment is carried out on a test bench and the impact of different initial pressure of gas chamber on the charging/discharging time as well as the control error during the vehicle height adjustment were studied. The experimental results show that the control strategy for the closed-loop air circuit laterally interconnected air suspension system can adjust the vehicle body height rapidly and accurately. The correctness of the mathematical model and the validity of control strategy are verified. The study about the impact of gas chamber initial pressure provides a theoretical basis for the setting of the vehicle height adjustment system parameters.