线控转向汽车横摆角速度增益优化设计

为了解决汽车线控转向系统(SBW)转向角传动比的设计问题,对SBW汽车横摆角速度增益值优化方法进行了研究。在建立整车动力学模型和驾驶员模型的基础上,从人-车闭环系统角度出发,采用汽车操纵稳定性综合评价体系中的轨迹跟踪误差评价指标、驾驶员操纵负担的评价指标、侧翻危险性评价指标和侧滑危险性评价指标并与遗传算法相结合,在典型车速下对汽车横摆角速度增益值进行了优化。试验结果表明,采用优化后横摆角速度增益值设计的SBW转向传动比可有效地提高汽车操纵性,减轻驾驶员负担。

Optimization design of vehicle yaw rate gain for steer-by-wire

In order to study the variable steering ratio design of Steer-By-Wire (SBR) system, vehicle dynamic model and driver were built. A steady state control strategy for the steering ratio was designed to keep the vehicle yaw rate gain a constant. Under typical vehicle speed, the vehicle yaw rate gain was optimized by genetic algorithm and the steering ratio of SBW system was calculated. The optimization is based on driver-vehicle close-loop, and adopts comprehensive evaluation indexes of vehicle handling and stability, which include lateral trace error index, driver burden index, rollover rate index and slip rate index of vehicle gravity center. Test results show that the proposed control strategy can effectively improve the vehicle maneuverability and reduce the driver burden.