干式双离合自动变速器分段优化换挡策略研究

综合离合器滑摩功和冲击度作为换挡过程性能的评价指标,基于该性能指标分析了干式双离合器自动变速器(DCT)换挡过程中的关键节点,将换挡过程划分为4个阶段,并根据各个阶段的特点采用相应的控制策略,来达到换挡过程整体优化。在扭矩交互阶段采用微滑摩转速跟随策略,在调速阶段采用基于离散动态规划的策略。将该换挡策略应用于试验车辆,验证了其在改善干式双离合自动变速器换挡综合性能上的有效性。

Multi-section Optimization Shift Control Method of Dry Dual Clutch Transmission

Clutch friction work and vehicle jerk were synthesized to evaluate the shift process performance of dry dual clutch transmission (DCT). The entire shift process was analyzed and divided into 4 sections by the key points which were found based on the synthesized criterion. A control algorithm including proper control methods in every respective section was designed to achieve optimization of the entire process. Especially, the micro-slip control method was applied in the torque swap section and the discrete dynamic programming method was applied in the speed regulation section. At last, the algorithm was applied in the experimental vehicle and the experiment result showed the effectiveness in improving shift performance of DCT. Compared with the traditional control algorithm, the results prove that the new algorithm can decrease vehicle jerk during the entire shift process without producing more clutch friction work.