【摘要】 汽车防抱死制动系统能够在极限工况下改善车辆的制动性能,但是制动系统具有不确定性、时变性以及非线性的特点。滑模控制以其鲁棒性强的特性能够适应制动系统的要求,但是滑模控制在应用中会引入抖振,引起趋近速度与抖振的矛盾,为解决滑模控制存在的振动问题,采用模糊控制与滑模控制结合的方式可以实现滑模参数的动态调整,根据系统状态,利用模糊规则实时调整滑模切换项的系数,并通过对滑模函数的优化,可提高控制的敏感度。仿真结果表明,所设计的模糊滑模控制器可以有效削弱抖振,并保证了较快的响应速度,改善了防抱死制动系统性能。更多还原

【Abstract】 Anti-lock braking system can improve vehicle braking performance in the limit condition,but the braking system possesses the characteristics of uncertainty,time-varying and nonlinear. Sliding mode control is able to satisfy the requirement of the braking system because of its robust characteristic,but sliding mode control brings chattering,and the contradiction between speed and chattering is the problem existing in sliding mode control. Since combining fuzzy logic control with sliding mode control can realize dynamic adjustment of sliding mode parameters,according to the system state,we made use of fuzzy rules to adjust the coefficient of sliding mode switching term in real time,and though optimizing of sliding mode function,we improved the sensitivity of control. The simulation result shows that the fuzzy sliding mode controller can reduce the chattering effectively and improve the performance of Anti-lock Braking System.更多还原