The invention provides a vehicle stability judgment method based on a phase plane, which comprises the following steps of: inputting different vehicle running condition parameters into a nonlinear two-degree-of-freedom vehicle model, drawing a vehicle stability phase plane graph under all working conditions, and dividing to obtain an initial stable region boundary; the working condition parameters correspond to the slope and the horizontal axis intercept of the initial stable region boundary, a random forest database is constructed, the working condition parameters serve as input, the slope and the horizontal axis intercept serve as output, and a random forest regression prediction model is obtained through training; inputting real-time vehicle driving condition parameters into the nonlinear two-degree-of-freedom vehicle model and the random forest regression prediction model to obtain coordinates of real-time vehicle state points and an initial stable boundary under the real-time vehicle driving condition, and mapping tire lateral force characteristics into a phase plane graph under the real-time condition; and judging a vehicle stability control mode according to the state point in the region where the phase plane graph is located. According to the method, the judgment accuracy of the vehicle stability control mode is improved.

    本发明提供一种基于相平面的车辆稳定性判断方法,包括:将不同车辆行驶工况参数输入非线性二自由度车辆模型,绘制全工况下的车辆稳定性相平面图,并划分得到初始稳定区域边界;将工况参数及初始稳定区域边界的斜率和横轴截距进行对应,构建随机森林数据库,将工况参数作为输入,斜率和横轴截距作为输出,训练得到随机森林回归预测模型;将实时车辆行驶工况参数输入到非线性二自由度车辆模型和随机森林回归预测模型中,得到实时车辆状态点的坐标及实时车辆行驶工况下初始稳定边界,将轮胎侧向力特性映射到实时工况下的相平面图中,根据状态点在相平面图所处区域对车辆稳定性控制模式进行判断。本发明的方法提高了车辆稳定性控制模式判断的准确性。


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    Title :

    Vehicle stability judgment method based on phase plane


    Additional title:

    一种基于相平面的车辆稳定性判断方法


    Contributors:
    LI JING (author) / ZHANG LE (author) / LUO JIN (author) / GAO MIN (author)

    Publication date :

    2025-02-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G06N COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS , Rechnersysteme, basierend auf spezifischen Rechenmodellen



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