The invention discloses a feed-forward correction method for tire force fluctuation of a distributed driving electric automobile, which is characterized in that according to a calculation formula of a relative damping coefficient of tire torsional vibration, the feed-forward correction method is designed to realize wave trapping on a given torque near an inherent frequency of the torsional vibration of a wheel so as to realize suppression of the tire force fluctuation; the real-time calculation method for the relative damping coefficient of the tire torsional vibration is designed according to the change condition of the relative damping coefficient of the tire torsional vibration along with the wheel speed and the longitudinal slippage rigidity. The slip rate derivative and the longitudinal slip stiffness are calculated by obtaining the wheel speed, the vehicle speed and the motor output torque signal in real time, then the actual relative damping coefficient of tire torsional vibration is calculated online, and whether feed-forward correction intervenes in given motor torque adjustment or not is determined according to the absolute value of the difference value of the actual relative damping coefficient and the target relative damping coefficient. Therefore, the dynamic quality of the tire force response and the driving comfort when the distributed driving automobile accelerates are improved.
本发明公开了一种分布式驱动电动汽车轮胎力波动的前馈校正方法,是根据轮胎扭转振动相对阻尼系数计算公式,设计了一种前馈校正方法对车轮扭转振动固有频率附近的给定转矩实现陷波,进而实现轮胎力波动抑制;针对轮胎扭转振动相对阻尼系数随轮速和纵向滑移刚度变化情况,设计实现了轮胎扭转振动相对阻尼系数实时计算方法,通过实时获得轮速、车速和电机输出扭矩信号计算滑移率导数、纵向滑移刚度进而在线计算轮胎扭转振动实际相对阻尼系数,根据实际相对阻尼系数与目标相对阻尼系数差值的绝对值与决定前馈校正是否介入给定电机扭矩的调节,从而改善分布式驱动汽车加速时轮胎力响应的动态品质与驾乘舒适性。
Feedforward correction method for distributed driving electric vehicle tire force fluctuation
一种分布式驱动电动汽车轮胎力波动的前馈校正方法
2023-09-01
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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