【摘要】 为提高汽车无级变速器控制系统对外界负荷扰动和各种运行工况的自适应能力,设计了汽车无级变速器(CVT)的自适应模糊控制系统。确定了误差e和误差变化率·e的隶属度函数及其赋值表,同样确定了自适应调整系数K1及K2的隶属度函数和它们的赋值表,并建立了K1和K2的控制规则,由此通过模糊自适应控制算法计算了K1和K2的查询表。然后用实验台架对该控制系统进行了实验,实验过程是在估计e和·e值的情况下根据经验输入K1和K2的值后由实验输出控制特性曲线,针对不同的e和·e输入与之对应的K1和K2,从而得到多组特性曲线,由此分析了该控制系统的性能。从实验曲线可以看出,CVT电液伺服模糊自适应控制的自适应能力强,稳定性好,峰值时间小,鲁棒性强。更多还原

【Abstract】 In order to improve the adaptivity and anti-jamming performance of a CVT electro-hydraulic servo system,we designed an adaptive fuzzy control system of the CVT electro-hydraulic servo system.We determined the membership function of adaptive error(e) and error change rate(·e) and the membership functions and valuation tables of adaptive adjustment coefficient K1 and K2.We also established the control rules of K1 and K2 and calculated the query tables of K1 and K2 by fuzzy adaptive control algorithm.Then,the control system is simulated through the CVT test bench.Experimental results show that CVT electro-hydraulic servo fuzzy adaptive control has strong adaptivity,good stability,short peak time and strong robustness.更多还原