【摘要】 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/s~3,相较于磨损前的4.5 m/s~3有所增大,但是仍小于德国的冲击度推荐值10 m/s~3,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。更多还原

【Abstract】 The dynamic characteristics of the clutch friction plate will change after the wear of the clutch,which causes the control effect of the strategy to deteriorate when the mode is switched. For this reason,this paper proposed an improved method of clutch coordination control strategy during parallel hybrid electric vehicle( PHEV) mode switching based on Kalman filter. By modeling the engine starting resistance and using the Kalman filter to estimate the wear of the clutch friction plate,combined with the dynamic characteristics of the clutch after wear, the combined pressure output of the original control strategy was compensated.MATLAB/Simulink and Cruise was used to jointly verify the improved mode switching control strategy. The results show that when the clutch is excessively worn,the previous control strategy fails to complete the mode switching process,but the improved control strategy can still complete the mode switching. Although the maximum impact degree reaches 8. 5 m/s~3,larger than 4. 5 m/s~3 before wear,it is still less than the recommended value of German impact 10 m/s~3. The improved control strategy can still maintain a good control effect after wear.更多还原