The invention discloses a phase space vehicle stability discrimination method, and the method comprises the steps: firstly obtaining vehicle parameters, building a three-degree-of-freedom vehicle analysis model according to the parameters, and drawing a vehicle stability phase space diagram through a vehicle three-degree-of-freedom model; wherein the phase space diagram is a longitudinal speed-yawvelocity-side slip angle phase space diagram, the side slip angle is used as an x axis, the yaw velocity is used as a y axis, and the longitudinal speed is used as a z axis; determining a vehicle phase space stable region according to the driving working condition, and establishing a vehicle phase space stable region library under different working conditions; and finally, judging whether the vehicle is unstable or not by judging whether the vehicle driving state point is outside the stable region or not. The vehicle phase space stable area can be accurately divided, the longitudinal speed factor is considered on the basis of the widely applied phase plane method, whether the vehicle is unstable or not can be judged more accurately, and a basis is provided for vehicle stability control.
本发明公开了一种相空间车辆稳定性判别方法,首先获取车辆参数,根据参数建立三自由度车辆分析模型,利用车辆三自由度模型绘制车辆稳定性相空间图;相空间图为纵向速度‑横摆角速度‑质心侧偏角相空间图,以质心侧偏角为x轴,以横摆角速度为y轴,以纵向速度为z轴;然后依据行车工况确定车辆相空间稳定区域,建立不同工况下车辆相空间稳定域库;最后通过判断车辆行驶状态点是否在稳定域外判别车辆是否失稳。根据本发明所提供的判别方法能够精确划分车辆相空间稳定区域,并且广泛应用的相平面法基础上考虑了纵向速度因素,可以更加准确地判断车辆是否失稳,为车辆稳定性控制提供依据。
Phase space vehicle stability discrimination method
一种相空间车辆稳定性判别方法
2020-08-07
Patent
Electronic Resource
Chinese
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 |
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