ECAS系统控制模式及控制策略

Control Mode and Control Strategy in ECAS System

为了提高汽车平顺性和操纵稳定性,引入ECAS/ESAC系统,将决策控制做为空气悬架系统的控制策略,再根据对悬架偏频大小的要求和空气弹簧刚度特性,逆推出空气弹簧高度的结果调节范围,根据车速确定高度的控制策略,通过遗传算法的优化实现弹簧刚度与减振器阻尼的匹配,根据匹配结果最终确定阻尼的控制模式和控制策略。分别利用非线性系统半车动力学模型和蛇形试验仿真在此系统下的汽车平顺性和操纵稳定性。仿真结果及试验表明:在随机路面条件下,由于控制策略的实施,空气悬架系统的平顺性和操纵稳定性均有所提高。

In order to improve ride comfort and handling stability, ECAS / ESAC system is introduced, in which decision-making control of the air suspension system is used as a control strategy, and then based on the partial frequency of suspension and stiffness properties of air spring, adjustment range of the height of air spring is reversely deduced. Meanwhile, the height of air spring is determined according to the speed. In addition, the match between spring stiffness and shock absorber damping is realized through the optimization of genetic algorithm. On the basis of the results of the match, the damping control mode and control strategy are finally determined. The dynamic mode of semi-car in the non-linear system and serpentine test are respectively used to simulate the ride comfort and handling stability under ECAS / ESAC system. The simulation results and the test demonstrate that： owing to the implementation of control strategies, ride comfort and handling stability of air suspension system are both improved under random road condition.