基于Lorenz散点图的低等级道路驾驶安全评价

Assessment of Driving Safety on Low-grade Roads Based on Lorenz Scatter Plot

摘要:

通过驾驶模拟实验采集22名驾驶人低等级道路行驶数据，借助Lorenz散点图提出驾驶波动指标，得到切向加速度、横向加速度和方向盘转动角速度的失稳波动阈值，分别为0.993、1.322和0.669。最后，利用模糊逻辑理论综合3项指标，完成对安全状态的分级。结果表明：切向和横向加速度的波动受天气场景和弯道半径的交互作用，在结冰路段的15 m弯道上最易发生危险失稳；方向盘转动角速度的失稳只受弯道半径影响，随着弯道半径增大逐渐加强。

Abstract:

The low-grade road driving data of 22 drivers were collected through driving simulation experiment， and the driving fluctuation index was proposed based on Lorenz scatter plot. Then， the instability fluctuation thresholds of tangential acceleration， lateral acceleration and steering wheel speed were obtained （0.993， 1.322 and 0.669 respectively）. Finally， the fuzzy logic theory was used to synthesize the three indicators to complete the classification of the safety state. It is found that the fluctuation of tangential and lateral acceleration is affected by the interaction of weather scene and curve radius， and the dangerous instability is most likely to occur on the 15 m curve in the icing section. However， the instability of steering wheel speed is only affected by the curve radius， and increases with the increase of curve radius.