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首页> 外文期刊>SAE International Journal of Passenger Cars - Mechanical Systems >A New Control Strategy for Electric Power Steering on Low Friction Roads
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A New Control Strategy for Electric Power Steering on Low Friction Roads

机译：低摩擦道路上电动助力转向的新控制策略

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摘要

In vehicles equipped with conventional Electric Power Steering (EPS) systems, the steering effort felt by the driver can be unreasonably low when driving on slippery roads. This may lead inexperienced drivers to steer more than what is required in a turn and risk losing control of the vehicle. Thus, it is sensible for tire-road friction to be accounted for in the design of future EPS systems. This paper describes the design of an auxiliary EPS controller that manipulates torque delivery of current EPS systems by supplying its motor with a compensation current controlled by a fuzzy logic algorithm that considers tire-road friction among other factors. Moreover, a steering system model, a nonlinear vehicle dynamics model and a Dugoff tire model are developed in MATLAB/Simulink. Physical testing is conducted to validate the virtual model and confirm that steering torque decreases considerably on low friction roads. Finally, simulation results show that the new EPS assist control strategy successfully increases steering effort under slippery conditions without compromising ease of steering, while ensuring that road feel also increases with decreasing in road friction and/or increasing vehicle speed as an additional safety measure.
机译：在配备有常规电动助力转向（EPS）系统的车辆中，在湿滑的路面上行驶时，驾驶员感受到的转向力可能会过​​低。这可能会导致经验不足的驾驶员转向时所需要的转向次数更多，并可能失去对车辆的控制。因此，在未来的EPS系统的设计中考虑轮胎-轮胎摩擦是明智的。本文介绍了一种辅助EPS控制器的设计，该控制器通过为电动机提供补偿电流来操纵当前EPS系统的转矩传递，该补偿电流由模糊逻辑算法控制，该逻辑算法考虑了轮胎与路面之间的摩擦等因素。此外，在MATLAB / Simulink中开发了转向系统模型，非线性车辆动力学模型和Dugoff轮胎模型。进行了物理测试，以验证虚拟模型并确认在低摩擦路面上的转向扭矩大大降低。最后，仿真结果表明，新的EPS辅助控制策略在不打滑的情况下成功增加了在湿滑条件下的转向力度，同时确保道路感觉也随着道路摩擦的减小和/或车速的增加而增加，作为一项附加的安全措施。

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