The invention discloses a method for designing a variable transmission ratio coefficient of a steer-by-wire system, which belongs to the technical field of electric vehicle drive-by-wire, and comprises the following steps of: establishing a human-vehicle comprehensive evaluation index under a specific transmission ratio; acquiring a vehicle speed and transmission ratio coefficient fitting curve; testing to obtain yaw velocity gains, lateral acceleration gains and roll angle gains corresponding to different steering wheel angles at a fixed vehicle speed and ideal steering gains at each vehicle speed; calculating a variable transmission ratio coefficient under the ideal steering gain; calculating the weight of the variable transmission ratio coefficient under the ideal steering gain; and performing weighted combination on the yaw velocity gain, the lateral acceleration gain, the roll angle gain and each steering gain weight coefficient to obtain a variable transmission ratio coefficient considering the comprehensive vehicle steering gain. And finally, importing a fuzzy neural network for training to obtain a model of the variable transmission ratio coefficient of the steer-by-wire system about the vehicle speed and the steering wheel angle. The steering gain of the vehicle can be maintained, and the stability and safety of the vehicle are improved.
本发明公开一种线控转向系统变传动比系数设计方法,属于电动汽车线控技术领域,包括:建立特定传动比下人‑车综合评价指标;获取车速与传动比系数拟合曲线;试验获得固定车速下不同方向盘角度对应的横摆角速度增益、侧向加速度增益、侧倾角增益以及每个车速下的理想转向增益;计算理想转向增益下的变传动比系数;计算理想转向增益下变传动比系数的权重;将横摆角速度增益、侧向加速度增益、侧倾角增益与各项转向增益权重系数进行加权组合得到考虑综合车辆转向增益的变传动比系数。最后导入模糊神经网络进行训练,得到线控转向系统的变传动比系数关于车速与方向盘转角的模型。本发明可维持车辆的转向增益,提高了车辆的稳定性和安全性。
Design method for variable transmission ratio coefficient of steer-by-wire system
一种线控转向系统变传动比系数设计方法
2024-04-12
Patent
Electronic Resource
Chinese
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