本文应用键图法研究汽车振动问题。建立了四自由度客车垂向振动系统的键图模型,给出了模拟道路周期性激励和脉冲型激励的键图模型。动态响应的模拟结果表明:键图模拟汽车振动响应,简便、快捷、直观。文中还进一步探讨了键图法用于汽车悬挂参数优化的可行性,发现键图法对此可以更充分地发挥“便于修改模型和参数”的特点。 In this paper, the key map method to study the issue of vehicle vibration. The key map model of the vertical vibration system for four-DOF passenger cars is established, and the key map model for simulating the periodic and impulsive excitation of the road is given. The simulation results of dynamic response show that the key map simulates the vibration response of the vehicle, which is simple, quick and intuitive. The article also further discusses the key map method for the optimization of vehicle suspension parameters feasibility and found that the key map method which can more fully play the “easy to modify the model and parameters”.