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为分析轴距预瞄控制对重型汽车道路友好性的影响,基于简化的4自由度汽车系统动力学模型,设计了汽车主动悬架系统的有预瞄和无预瞄最优控制器。采用MATALB/Simulink软件建立随机路面激励模型并进行校验,在此基础上,建立汽车道路友好性仿真模型,对比分析了被动悬架、最优控制悬架和轴距预瞄最优控制悬架的行驶平顺性和道路友好性,并采用参数化方法,分析了车速对预瞄控制效果的影响。结果表明,相对于被动悬架,主动悬架能够有效改善汽车的行驶平顺性和道路友好性,且相对于无预瞄最优控制悬架,轴距预瞄控制对悬架性能的改善主要体现在后悬架上,对前悬架的改善不太明显;车速对预瞄控制道路友好性的改进效果呈先增大后减小趋势,在中速时改进效果良好。
In order to analyze the influence of wheelbase preview control on the road-friendliness of heavy-duty vehicles, aiming at the simplified four-degree-of-freedom vehicle system dynamics model, the optimal controller with pre-sight and non-preview for vehicle active suspension system was designed. In this paper, a mathematic model of road-friendliness was set up based on MATALB / Simulink software to build a random road surface motivation model. The passive suspension, optimal control suspension and wheelbase previewed optimal control suspension were compared and analyzed. The ride comfort and road friendliness are analyzed. The parameterized method is used to analyze the effect of vehicle speed on the preview control effect. The results show that compared with passive suspension, active suspension can effectively improve the ride comfort and road friendliness of the vehicle. Compared with the optimal suspension without preview, the improvement of suspension performance by wheelbase preview control is mainly reflected On the rear suspension, the improvement of the front suspension is not obvious; the improvement effect of the speed on the friendlyness of the preview control road first increases and then decreases, and the improvement effect is good at the middle speed.