PHEV模式切换中离合器协调控制策略改进设计

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由于离合器摩擦片磨损后其动态特性会发生变化,导致模式切换时控制策略的控制效果变差.为此,本文提出一种基于卡尔曼滤波的并联式混合动力汽车(PHEV)模式切换过程中离合器协调控制策略的改进方法.通过对发动机起动阻力建模,以及利用卡尔曼滤波器对离合器摩擦片磨损量进行估计,结合离合器磨损后的动态特性,对原有控制策略的结合压力输出进行补偿,对改进后的模式切换控制策略进行仿真验证.结果显示:在离合器过度磨损时,以往的控制策略未能完成模式切换过程,而改进后的控制策略仍能完成模式切换,虽然最大冲击度达到8.5 m/s3,相较于磨损前的4.5 m/s3有所增大,但是仍小于德国的冲击度推荐值10 m/s3,可以认为改进后的控制策略在磨损后仍能保持良好的控制效果.
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